TLS Fetcher fixes

Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>

.github/workflows/build.yml

@@ -0,0 +1,39 @@
+name: Build
+
+on:
+  push:
+    branches: [ "*" ]
+  pull_request:
+    branches: [ "*" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install latest stable Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo registry & build artifacts
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Build Release
+        run: cargo build --release --verbose

.github/workflows/release.yml

@@ -26,6 +26,9 @@ jobs:
     name: GNU ${{ matrix.target }}
     runs-on: ubuntu-latest
 
+    container:
+      image: rust:slim-bookworm
+
     strategy:
       fail-fast: false
       matrix:
@@ -47,8 +50,8 @@ jobs:
 
       - name: Install deps
         run: |
-          sudo apt-get update
-          sudo apt-get install -y \
+          apt-get update
+          apt-get install -y \
             build-essential \
             clang \
             lld \
@@ -69,14 +72,10 @@ jobs:
           if [ "${{ matrix.target }}" = "aarch64-unknown-linux-gnu" ]; then
             export CC=aarch64-linux-gnu-gcc
             export CXX=aarch64-linux-gnu-g++
-            export CC_aarch64_unknown_linux_gnu=aarch64-linux-gnu-gcc
-            export CXX_aarch64_unknown_linux_gnu=aarch64-linux-gnu-g++
             export RUSTFLAGS="-C linker=aarch64-linux-gnu-gcc"
           else
             export CC=clang
             export CXX=clang++
-            export CC_x86_64_unknown_linux_gnu=clang
-            export CXX_x86_64_unknown_linux_gnu=clang++
             export RUSTFLAGS="-C linker=clang -C link-arg=-fuse-ld=lld"
           fi
 
@@ -85,20 +84,19 @@ jobs:
       - name: Package
         run: |
           mkdir -p dist
-          BIN=target/${{ matrix.target }}/release/${{ env.BINARY_NAME }}
-
-          cp "$BIN" dist/${{ env.BINARY_NAME }}-${{ matrix.target }}
+          cp target/${{ matrix.target }}/release/${{ env.BINARY_NAME }} dist/telemt
 
           cd dist
-          tar -czf ${{ matrix.asset }}.tar.gz ${{ env.BINARY_NAME }}-${{ matrix.target }}
+          tar -czf ${{ matrix.asset }}.tar.gz \
+            --owner=0 --group=0 --numeric-owner \
+            telemt
+
           sha256sum ${{ matrix.asset }}.tar.gz > ${{ matrix.asset }}.sha256
 
       - uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.asset }}
-          path: |
-            dist/${{ matrix.asset }}.tar.gz
-            dist/${{ matrix.asset }}.sha256
+          path: dist/*
 
 # ==========================
 # MUSL
@@ -125,43 +123,7 @@ jobs:
       - name: Install deps
         run: |
           apt-get update
-          apt-get install -y \
-            musl-tools \
-            pkg-config \
-            curl
-
-      - uses: actions/cache@v4
-        if: matrix.target == 'aarch64-unknown-linux-musl'
-        with:
-          path: ~/.musl-aarch64
-          key: musl-toolchain-aarch64-v1
-
-      - name: Install aarch64 musl toolchain
-        if: matrix.target == 'aarch64-unknown-linux-musl'
-        run: |
-          set -e
-
-          TOOLCHAIN_DIR="$HOME/.musl-aarch64"
-          ARCHIVE="aarch64-linux-musl-cross.tgz"
-          URL="https://github.com/telemt/telemt/releases/download/toolchains/$ARCHIVE"
-
-          if [ -x "$TOOLCHAIN_DIR/bin/aarch64-linux-musl-gcc" ]; then
-            echo "✅ MUSL toolchain already installed"
-          else
-            echo "⬇️ Downloading musl toolchain from Telemt GitHub Releases..."
-
-            curl -fL \
-              --retry 5 \
-              --retry-delay 3 \
-              --connect-timeout 10 \
-              --max-time 120 \
-              -o "$ARCHIVE" "$URL"
-
-            mkdir -p "$TOOLCHAIN_DIR"
-            tar -xzf "$ARCHIVE" --strip-components=1 -C "$TOOLCHAIN_DIR"
-          fi
-
-          echo "$TOOLCHAIN_DIR/bin" >> $GITHUB_PATH
+          apt-get install -y musl-tools pkg-config curl
 
       - name: Add rust target
         run: rustup target add ${{ matrix.target }}
@@ -178,11 +140,9 @@ jobs:
         run: |
           if [ "${{ matrix.target }}" = "aarch64-unknown-linux-musl" ]; then
             export CC=aarch64-linux-musl-gcc
-            export CC_aarch64_unknown_linux_musl=aarch64-linux-musl-gcc
             export RUSTFLAGS="-C target-feature=+crt-static -C linker=aarch64-linux-musl-gcc"
           else
             export CC=musl-gcc
-            export CC_x86_64_unknown_linux_musl=musl-gcc
             export RUSTFLAGS="-C target-feature=+crt-static"
           fi
 
@@ -191,69 +151,19 @@ jobs:
       - name: Package
         run: |
           mkdir -p dist
-          BIN=target/${{ matrix.target }}/release/${{ env.BINARY_NAME }}
-
-          cp "$BIN" dist/${{ env.BINARY_NAME }}-${{ matrix.target }}
+          cp target/${{ matrix.target }}/release/${{ env.BINARY_NAME }} dist/telemt
 
           cd dist
-          tar -czf ${{ matrix.asset }}.tar.gz ${{ env.BINARY_NAME }}-${{ matrix.target }}
+          tar -czf ${{ matrix.asset }}.tar.gz \
+            --owner=0 --group=0 --numeric-owner \
+            telemt
+
           sha256sum ${{ matrix.asset }}.tar.gz > ${{ matrix.asset }}.sha256
 
       - uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.asset }}
-          path: |
-            dist/${{ matrix.asset }}.tar.gz
-            dist/${{ matrix.asset }}.sha256
-
-# ==========================
-# Docker
-# ==========================
-  docker:
-    name: Docker
-    runs-on: ubuntu-latest
-    needs: [build-gnu, build-musl]
-    continue-on-error: true
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/download-artifact@v4
-        with:
-          path: artifacts
-
-      - name: Extract binaries
-        run: |
-          mkdir dist
-          find artifacts -name "*.tar.gz" -exec tar -xzf {} -C dist \;
-
-          cp dist/telemt-x86_64-unknown-linux-musl dist/telemt || true
-
-      - uses: docker/setup-qemu-action@v3
-      - uses: docker/setup-buildx-action@v3
-
-      - name: Login to GHCR
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Extract version
-        id: vars
-        run: echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
-
-      - name: Build & Push
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          push: true
-          platforms: linux/amd64,linux/arm64
-          tags: |
-            ghcr.io/${{ github.repository }}:${{ steps.vars.outputs.VERSION }}
-            ghcr.io/${{ github.repository }}:latest
-          build-args: |
-            BINARY=dist/telemt
+          path: dist/*
 
 # ==========================
 # Release
@@ -271,7 +181,7 @@ jobs:
         with:
           path: artifacts
 
-      - name: Flatten artifacts
+      - name: Flatten
         run: |
           mkdir dist
           find artifacts -type f -exec cp {} dist/ \;
@@ -281,5 +191,61 @@ jobs:
         with:
           files: dist/*
           generate_release_notes: true
-          draft: false
-          prerelease: ${{ contains(github.ref, '-rc') || contains(github.ref, '-beta') || contains(github.ref, '-alpha') }}
+          prerelease: ${{ contains(github.ref, '-') }}
+
+# ==========================
+# Docker (FROM RELEASE)
+# ==========================
+  docker:
+    name: Docker (from release)
+    runs-on: ubuntu-latest
+    needs: release
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install gh
+        run: apt-get update && apt-get install -y gh
+
+      - name: Extract version
+        id: vars
+        run: echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+
+      - name: Download binary
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          mkdir dist
+
+          gh release download ${{ steps.vars.outputs.VERSION }} \
+            --repo ${{ github.repository }} \
+            --pattern "telemt-x86_64-linux-musl.tar.gz" \
+            --dir dist
+
+          tar -xzf dist/telemt-x86_64-linux-musl.tar.gz -C dist
+          chmod +x dist/telemt
+
+      - uses: docker/setup-qemu-action@v3
+      - uses: docker/setup-buildx-action@v3
+
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build & Push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            ghcr.io/${{ github.repository }}:${{ steps.vars.outputs.VERSION }}
+            ghcr.io/${{ github.repository }}:latest
+          build-args: |
+            BINARY=dist/telemt

.github/workflows/rust.yml

@@ -1,54 +0,0 @@
-name: Rust
-
-on:
-  push:
-    branches: [ "*" ]
-  pull_request:
-    branches: [ "*" ]
-
-env:
-  CARGO_TERM_COLOR: always
-
-jobs:
-  build:
-    name: Compile, Test, Lint
-    runs-on: ubuntu-latest
-
-    permissions:
-      contents: read
-      actions: write
-      checks: write
-
-    steps:
-    - name: Checkout repository
-      uses: actions/checkout@v4
-
-    - name: Install latest stable Rust toolchain
-      uses: dtolnay/rust-toolchain@stable
-      with:
-        components: rustfmt, clippy
-
-    - name: Cache cargo registry & build artifacts
-      uses: actions/cache@v4
-      with:
-        path: |
-          ~/.cargo/registry
-          ~/.cargo/git
-          target
-        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
-        restore-keys: |
-          ${{ runner.os }}-cargo-
-
-    - name: Compile (no tests)
-      run: cargo check --workspace --all-features --lib --bins --verbose
-
-    - name: Run tests (single pass)
-      run: cargo test --workspace --all-features --verbose
-
-# clippy dont fail on warnings because of active development of telemt 
-# and many warnings
-    - name: Run clippy
-      run: cargo clippy -- --cap-lints warn
-
-    - name: Check for unused dependencies
-      run: cargo udeps || true

.github/workflows/stress.yml

@@ -1,57 +0,0 @@
-name: Stress Tests
-
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: '0 2 * * *'
-  pull_request:
-    branches: ["*"]
-    paths:
-      - src/proxy/**
-      - src/transport/**
-      - src/stream/**
-      - src/protocol/**
-      - src/tls_front/**
-      - Cargo.toml
-      - Cargo.lock
-
-env:
-  CARGO_TERM_COLOR: always
-
-jobs:
-  quota-lock-stress:
-    name: Quota-lock stress loop
-    runs-on: ubuntu-latest
-
-    permissions:
-      contents: read
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Install latest stable Rust toolchain
-        uses: dtolnay/rust-toolchain@stable
-
-      - name: Cache cargo registry and build artifacts
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-            target
-          key: ${{ runner.os }}-cargo-stress-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-cargo-stress-
-            ${{ runner.os }}-cargo-
-
-      - name: Run quota-lock stress suites
-        env:
-          RUST_TEST_THREADS: 16
-        run: |
-          set -euo pipefail
-          for i in $(seq 1 12); do
-            echo "[quota-lock-stress] iteration ${i}/12"
-            cargo test quota_lock_ --bin telemt -- --nocapture --test-threads 16
-            cargo test relay_quota_wake --bin telemt -- --nocapture --test-threads 16
-          done

.github/workflows/test.yml

@@ -0,0 +1,127 @@
+name: Check
+
+on:
+  push:
+    branches: [ "*" ]
+  pull_request:
+    branches: [ "*" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+concurrency:
+  group: test-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+# ==========================
+# Formatting
+# ==========================
+  fmt:
+    name: Fmt
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+
+      - run: cargo fmt -- --check
+
+# ==========================
+# Tests
+# ==========================
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      actions: write
+      checks: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - run: cargo test --verbose
+
+# ==========================
+# Clippy
+# ==========================
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      checks: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - run: cargo clippy -- --cap-lints warn
+
+# ==========================
+# Udeps
+# ==========================
+  udeps:
+    name: Udeps
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Install cargo-udeps
+        run: cargo install cargo-udeps || true
+
+      # тоже не валит билд
+      - run: cargo udeps || true

Dockerfile

@@ -1,29 +1,9 @@
 # syntax=docker/dockerfile:1
 
-# ==========================
-# Stage 1: Build
-# ==========================
-FROM rust:1.88-slim-bookworm AS builder
-
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    pkg-config \
-    ca-certificates \
-    && rm -rf /var/lib/apt/lists/*
-
-WORKDIR /build
-
-# Depcache
-COPY Cargo.toml Cargo.lock* ./
-RUN mkdir src && echo 'fn main() {}' > src/main.rs && \
-    cargo build --release 2>/dev/null || true && \
-    rm -rf src
-
-# Build
-COPY . .
-RUN cargo build --release && strip target/release/telemt
+ARG BINARY
 
 # ==========================
-# Stage 2: Compress (strip + UPX)
+# Stage: minimal
 # ==========================
 FROM debian:12-slim AS minimal
 
@@ -33,7 +13,6 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates \
     && rm -rf /var/lib/apt/lists/* \
     \
-    # install UPX from Telemt releases
     && curl -fL \
         --retry 5 \
         --retry-delay 3 \
@@ -46,15 +25,15 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     && chmod +x /usr/local/bin/upx \
     && rm -rf /tmp/upx*
 
-COPY --from=builder /build/target/release/telemt /telemt
+COPY ${BINARY} /telemt
 
 RUN strip /telemt || true
 RUN upx --best --lzma /telemt || true
 
 # ==========================
-# Stage 3: Debug base
+# Debug image
 # ==========================
-FROM debian:12-slim AS debug-base
+FROM debian:12-slim AS debug
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates \
@@ -64,48 +43,29 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     busybox \
     && rm -rf /var/lib/apt/lists/*
 
-# ==========================
-# Stage 4: Debug image
-# ==========================
-FROM debug-base AS debug
-
 WORKDIR /app
 
 COPY --from=minimal /telemt /app/telemt
 COPY config.toml /app/config.toml
 
-USER root
-
-EXPOSE 443
-EXPOSE 9090
-EXPOSE 9091
+EXPOSE 443 9090 9091
 
 ENTRYPOINT ["/app/telemt"]
 CMD ["config.toml"]
 
 # ==========================
-# Stage 5: Production (distroless)
+# Production (REAL distroless)
 # ==========================
-FROM gcr.io/distroless/base-debian12 AS prod
+FROM gcr.io/distroless/static-debian12 AS prod
 
 WORKDIR /app
 
 COPY --from=minimal /telemt /app/telemt
 COPY config.toml /app/config.toml
 
-# TLS + timezone + shell
-COPY --from=debug-base /etc/ssl/certs /etc/ssl/certs
-COPY --from=debug-base /usr/share/zoneinfo /usr/share/zoneinfo
-COPY --from=debug-base /bin/busybox /bin/busybox
-
-RUN ["/bin/busybox", "--install", "-s", "/bin"]
-
-# distroless user
 USER nonroot:nonroot
 
-EXPOSE 443
-EXPOSE 9090
-EXPOSE 9091
+EXPOSE 443 9090 9091
 
 ENTRYPOINT ["/app/telemt"]
-CMD ["config.toml"]
+CMD ["config.toml"]

docs/VPS_DOUBLE_HOP.en.md

@@ -63,7 +63,7 @@ recommended range from 5 to 2147483647 inclusive
 
 > [!IMPORTANT]
 > It is recommended to use your own, unique values.\
-> You can use the [generator](https://htmlpreview.github.io/?https://gist.githubusercontent.com/avbor/955782b5c37b06240b243aa375baeac5/raw/e8b269ff0089a27effd88f8d925179b78e5666c4/awg-gen.html) to select parameters.
+> You can use the [generator](https://htmlpreview.github.io/?https://gist.githubusercontent.com/avbor/955782b5c37b06240b243aa375baeac5/raw/13f5517ca473b47c412b9a99407066de973732bd/awg-gen.html) to select parameters.
 
 #### Server B Configuration (Netherlands):
 
@@ -84,6 +84,8 @@ Jmin = 8
 Jmax = 80
 S1 = 29
 S2 = 15
+S3 = 18
+S4 = 0
 H1 = 2087563914
 H2 = 188817757
 H3 = 101784570
@@ -121,6 +123,8 @@ Jmin = 8
 Jmax = 80
 S1 = 29
 S2 = 15
+S3 = 18
+S4 = 0
 H1 = 2087563914
 H2 = 188817757
 H3 = 101784570

docs/VPS_DOUBLE_HOP.ru.md

@@ -44,7 +44,7 @@ awg genkey | tee private.key | awg pubkey > public.key
 
 Параметры обфускации `S1`, `S2`, `H1`, `H2`, `H3`, `H4` должны быть строго идентичными на обоих серверах.\
 Параметры `Jc`, `Jmin` и `Jmax` могут отличатся.\
-Параметры `I1-I5` [(Custom Protocol Signature)](https://docs.amnezia.org/documentation/amnezia-wg/) нужно указывать на стороне _клиента_ (Сервер **А**).
+Параметры `I1-I5` ([Custom Protocol Signature](https://docs.amnezia.org/documentation/amnezia-wg/)) нужно указывать на стороне _клиента_ (Сервер **А**).
 
 Рекомендации по выбору значений:
 ```text
@@ -62,7 +62,7 @@ H1/H2/H3/H4 — должны быть уникальны и отличаться
 ```
 > [!IMPORTANT]
 > Рекомендуется использовать собственные, уникальные значения.\
-> Для выбора параметров можете воспользоваться [генератором](https://htmlpreview.github.io/?https://gist.githubusercontent.com/avbor/955782b5c37b06240b243aa375baeac5/raw/e8b269ff0089a27effd88f8d925179b78e5666c4/awg-gen.html).
+> Для выбора параметров можете воспользоваться [генератором](https://htmlpreview.github.io/?https://gist.githubusercontent.com/avbor/955782b5c37b06240b243aa375baeac5/raw/13f5517ca473b47c412b9a99407066de973732bd/awg-gen.html).
 
 #### Конфигурация Сервера B (_Нидерланды_):
 
@@ -83,6 +83,8 @@ Jmin = 8
 Jmax = 80
 S1 = 29
 S2 = 15
+S3 = 18
+S4 = 0
 H1 = 2087563914
 H2 = 188817757
 H3 = 101784570
@@ -121,6 +123,8 @@ Jmin = 8
 Jmax = 80
 S1 = 29
 S2 = 15
+S3 = 18
+S4 = 0
 H1 = 2087563914
 H2 = 188817757
 H3 = 101784570
@@ -272,7 +276,7 @@ backend telemt_nodes
 
 ```
 >[!WARNING]
->**Файл должен заканчиваться пустой строкой, иначе HAProxy не запуститься!**
+>**Файл должен заканчиваться пустой строкой, иначе HAProxy не запустится!**
 
 #### Разрешаем порт 443\tcp в фаерволе (если включен)
 ```bash

src/config/defaults.rs

@@ -185,6 +185,10 @@ pub(crate) fn default_proxy_protocol_header_timeout_ms() -> u64 {
     500
 }
 
+pub(crate) fn default_proxy_protocol_trusted_cidrs() -> Vec<IpNetwork> {
+    vec!["0.0.0.0/0".parse().unwrap(), "::/0".parse().unwrap()]
+}
+
 pub(crate) fn default_server_max_connections() -> u32 {
     10_000
 }

src/config/hot_reload.rs

@@ -228,7 +228,9 @@ impl HotFields {
             me_d2c_flush_batch_max_delay_us: cfg.general.me_d2c_flush_batch_max_delay_us,
             me_d2c_ack_flush_immediate: cfg.general.me_d2c_ack_flush_immediate,
             me_quota_soft_overshoot_bytes: cfg.general.me_quota_soft_overshoot_bytes,
-            me_d2c_frame_buf_shrink_threshold_bytes: cfg.general.me_d2c_frame_buf_shrink_threshold_bytes,
+            me_d2c_frame_buf_shrink_threshold_bytes: cfg
+                .general
+                .me_d2c_frame_buf_shrink_threshold_bytes,
             direct_relay_copy_buf_c2s_bytes: cfg.general.direct_relay_copy_buf_c2s_bytes,
             direct_relay_copy_buf_s2c_bytes: cfg.general.direct_relay_copy_buf_s2c_bytes,
             me_health_interval_ms_unhealthy: cfg.general.me_health_interval_ms_unhealthy,

src/config/load.rs

@@ -444,8 +444,7 @@ impl ProxyConfig {
 
         if !(5..=50).contains(&config.censorship.mask_classifier_prefetch_timeout_ms) {
             return Err(ProxyError::Config(
-                "censorship.mask_classifier_prefetch_timeout_ms must be within [5, 50]"
-                    .to_string(),
+                "censorship.mask_classifier_prefetch_timeout_ms must be within [5, 50]".to_string(),
             ));
         }
 
@@ -558,7 +557,9 @@ impl ProxyConfig {
             ));
         }
 
-        if !(4096..=16 * 1024 * 1024).contains(&config.general.me_d2c_frame_buf_shrink_threshold_bytes) {
+        if !(4096..=16 * 1024 * 1024)
+            .contains(&config.general.me_d2c_frame_buf_shrink_threshold_bytes)
+        {
             return Err(ProxyError::Config(
                 "general.me_d2c_frame_buf_shrink_threshold_bytes must be within [4096, 16777216]"
                     .to_string(),
@@ -1262,6 +1263,11 @@ mod tests {
         assert_eq!(cfg.general.update_every, default_update_every());
         assert_eq!(cfg.server.listen_addr_ipv4, default_listen_addr_ipv4());
         assert_eq!(cfg.server.listen_addr_ipv6, default_listen_addr_ipv6_opt());
+        assert_eq!(
+            cfg.server.proxy_protocol_trusted_cidrs,
+            default_proxy_protocol_trusted_cidrs()
+        );
+        assert_eq!(cfg.censorship.unknown_sni_action, UnknownSniAction::Drop);
         assert_eq!(cfg.server.api.listen, default_api_listen());
         assert_eq!(cfg.server.api.whitelist, default_api_whitelist());
         assert_eq!(
@@ -1394,6 +1400,14 @@ mod tests {
 
         let server = ServerConfig::default();
         assert_eq!(server.listen_addr_ipv6, Some(default_listen_addr_ipv6()));
+        assert_eq!(
+            server.proxy_protocol_trusted_cidrs,
+            default_proxy_protocol_trusted_cidrs()
+        );
+        assert_eq!(
+            AntiCensorshipConfig::default().unknown_sni_action,
+            UnknownSniAction::Drop
+        );
         assert_eq!(server.api.listen, default_api_listen());
         assert_eq!(server.api.whitelist, default_api_whitelist());
         assert_eq!(
@@ -1429,6 +1443,75 @@ mod tests {
         assert_eq!(access.users, default_access_users());
     }
 
+    #[test]
+    fn proxy_protocol_trusted_cidrs_missing_uses_trust_all_but_explicit_empty_stays_empty() {
+        let cfg_missing: ProxyConfig = toml::from_str(
+            r#"
+            [server]
+            [general]
+            [network]
+            [access]
+            "#,
+        )
+        .unwrap();
+        assert_eq!(
+            cfg_missing.server.proxy_protocol_trusted_cidrs,
+            default_proxy_protocol_trusted_cidrs()
+        );
+
+        let cfg_explicit_empty: ProxyConfig = toml::from_str(
+            r#"
+            [server]
+            proxy_protocol_trusted_cidrs = []
+
+            [general]
+            [network]
+            [access]
+            "#,
+        )
+        .unwrap();
+        assert!(
+            cfg_explicit_empty
+                .server
+                .proxy_protocol_trusted_cidrs
+                .is_empty()
+        );
+    }
+
+    #[test]
+    fn unknown_sni_action_parses_and_defaults_to_drop() {
+        let cfg_default: ProxyConfig = toml::from_str(
+            r#"
+            [server]
+            [general]
+            [network]
+            [access]
+            [censorship]
+            "#,
+        )
+        .unwrap();
+        assert_eq!(
+            cfg_default.censorship.unknown_sni_action,
+            UnknownSniAction::Drop
+        );
+
+        let cfg_mask: ProxyConfig = toml::from_str(
+            r#"
+            [server]
+            [general]
+            [network]
+            [access]
+            [censorship]
+            unknown_sni_action = "mask"
+            "#,
+        )
+        .unwrap();
+        assert_eq!(
+            cfg_mask.censorship.unknown_sni_action,
+            UnknownSniAction::Mask
+        );
+    }
+
     #[test]
     fn dc_overrides_allow_string_and_array() {
         let toml = r#"

src/config/tests/load_mask_classifier_prefetch_timeout_security_tests.rs

@@ -8,8 +8,9 @@ fn write_temp_config(contents: &str) -> PathBuf {
         .duration_since(UNIX_EPOCH)
         .expect("system time must be after unix epoch")
         .as_nanos();
-    let path = std::env::temp_dir()
-        .join(format!("telemt-load-mask-prefetch-timeout-security-{nonce}.toml"));
+    let path = std::env::temp_dir().join(format!(
+        "telemt-load-mask-prefetch-timeout-security-{nonce}.toml"
+    ));
     fs::write(&path, contents).expect("temp config write must succeed");
     path
 }
@@ -67,8 +68,8 @@ mask_classifier_prefetch_timeout_ms = 20
 "#,
     );
 
-    let cfg = ProxyConfig::load(&path)
-        .expect("prefetch timeout within security bounds must be accepted");
+    let cfg =
+        ProxyConfig::load(&path).expect("prefetch timeout within security bounds must be accepted");
     assert_eq!(cfg.censorship.mask_classifier_prefetch_timeout_ms, 20);
 
     remove_temp_config(&path);

src/config/tests/load_mask_shape_security_tests.rs

@@ -265,8 +265,8 @@ mask_relay_max_bytes = 67108865
 "#,
     );
 
-    let err = ProxyConfig::load(&path)
-        .expect_err("mask_relay_max_bytes above hard cap must be rejected");
+    let err =
+        ProxyConfig::load(&path).expect_err("mask_relay_max_bytes above hard cap must be rejected");
     let msg = err.to_string();
     assert!(
         msg.contains("censorship.mask_relay_max_bytes must be <= 67108864"),

src/config/types.rs

@@ -954,7 +954,8 @@ impl Default for GeneralConfig {
             me_d2c_flush_batch_max_delay_us: default_me_d2c_flush_batch_max_delay_us(),
             me_d2c_ack_flush_immediate: default_me_d2c_ack_flush_immediate(),
             me_quota_soft_overshoot_bytes: default_me_quota_soft_overshoot_bytes(),
-            me_d2c_frame_buf_shrink_threshold_bytes: default_me_d2c_frame_buf_shrink_threshold_bytes(),
+            me_d2c_frame_buf_shrink_threshold_bytes:
+                default_me_d2c_frame_buf_shrink_threshold_bytes(),
             direct_relay_copy_buf_c2s_bytes: default_direct_relay_copy_buf_c2s_bytes(),
             direct_relay_copy_buf_s2c_bytes: default_direct_relay_copy_buf_s2c_bytes(),
             me_warmup_stagger_enabled: default_true(),
@@ -1239,9 +1240,10 @@ pub struct ServerConfig {
 
     /// Trusted source CIDRs allowed to send incoming PROXY protocol headers.
     ///
-    /// When non-empty, connections from addresses outside this allowlist are
-    /// rejected before `src_addr` is applied.
-    #[serde(default)]
+    /// If this field is omitted in config, it defaults to trust-all CIDRs
+    /// (`0.0.0.0/0` and `::/0`). If it is explicitly set to an empty list,
+    /// all PROXY protocol headers are rejected.
+    #[serde(default = "default_proxy_protocol_trusted_cidrs")]
     pub proxy_protocol_trusted_cidrs: Vec<IpNetwork>,
 
     /// Port for the Prometheus-compatible metrics endpoint.
@@ -1286,7 +1288,7 @@ impl Default for ServerConfig {
             listen_tcp: None,
             proxy_protocol: false,
             proxy_protocol_header_timeout_ms: default_proxy_protocol_header_timeout_ms(),
-            proxy_protocol_trusted_cidrs: Vec::new(),
+            proxy_protocol_trusted_cidrs: default_proxy_protocol_trusted_cidrs(),
             metrics_port: None,
             metrics_listen: None,
             metrics_whitelist: default_metrics_whitelist(),
@@ -1357,6 +1359,14 @@ impl Default for TimeoutsConfig {
     }
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "lowercase")]
+pub enum UnknownSniAction {
+    #[default]
+    Drop,
+    Mask,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct AntiCensorshipConfig {
     #[serde(default = "default_tls_domain")]
@@ -1366,6 +1376,10 @@ pub struct AntiCensorshipConfig {
     #[serde(default)]
     pub tls_domains: Vec<String>,
 
+    /// Policy for TLS ClientHello with unknown (non-configured) SNI.
+    #[serde(default)]
+    pub unknown_sni_action: UnknownSniAction,
+
     /// Upstream scope used for TLS front metadata fetches.
     /// Empty value keeps default upstream routing behavior.
     #[serde(default = "default_tls_fetch_scope")]
@@ -1476,6 +1490,7 @@ impl Default for AntiCensorshipConfig {
         Self {
             tls_domain: default_tls_domain(),
             tls_domains: Vec::new(),
+            unknown_sni_action: UnknownSniAction::Drop,
             tls_fetch_scope: default_tls_fetch_scope(),
             mask: default_true(),
             mask_host: None,

src/error.rs

@@ -216,6 +216,9 @@ pub enum ProxyError {
     #[error("Invalid proxy protocol header")]
     InvalidProxyProtocol,
 
+    #[error("Unknown TLS SNI")]
+    UnknownTlsSni,
+
     #[error("Proxy error: {0}")]
     Proxy(String),
 

src/maestro/helpers.rs

@@ -8,8 +8,10 @@ use tracing::{debug, error, info, warn};
 
 use crate::cli;
 use crate::config::ProxyConfig;
+use crate::transport::UpstreamManager;
 use crate::transport::middle_proxy::{
-    ProxyConfigData, fetch_proxy_config_with_raw, load_proxy_config_cache, save_proxy_config_cache,
+    ProxyConfigData, fetch_proxy_config_with_raw_via_upstream, load_proxy_config_cache,
+    save_proxy_config_cache,
 };
 
 pub(crate) fn resolve_runtime_config_path(
@@ -288,9 +290,10 @@ pub(crate) async fn load_startup_proxy_config_snapshot(
     cache_path: Option<&str>,
     me2dc_fallback: bool,
     label: &'static str,
+    upstream: Option<std::sync::Arc<UpstreamManager>>,
 ) -> Option<ProxyConfigData> {
     loop {
-        match fetch_proxy_config_with_raw(url).await {
+        match fetch_proxy_config_with_raw_via_upstream(url, upstream.clone()).await {
             Ok((cfg, raw)) => {
                 if !cfg.map.is_empty() {
                     if let Some(path) = cache_path

src/maestro/me_startup.rs

@@ -63,9 +63,10 @@ pub(crate) async fn initialize_me_pool(
     let proxy_secret_path = config.general.proxy_secret_path.as_deref();
     let pool_size = config.general.middle_proxy_pool_size.max(1);
     let proxy_secret = loop {
-        match crate::transport::middle_proxy::fetch_proxy_secret(
+        match crate::transport::middle_proxy::fetch_proxy_secret_with_upstream(
             proxy_secret_path,
             config.general.proxy_secret_len_max,
+            Some(upstream_manager.clone()),
         )
         .await
         {
@@ -129,6 +130,7 @@ pub(crate) async fn initialize_me_pool(
                 config.general.proxy_config_v4_cache_path.as_deref(),
                 me2dc_fallback,
                 "getProxyConfig",
+                Some(upstream_manager.clone()),
             )
             .await;
             if cfg_v4.is_some() {
@@ -160,6 +162,7 @@ pub(crate) async fn initialize_me_pool(
                 config.general.proxy_config_v6_cache_path.as_deref(),
                 me2dc_fallback,
                 "getProxyConfigV6",
+                Some(upstream_manager.clone()),
             )
             .await;
             if cfg_v6.is_some() {

src/main.rs

@@ -7,12 +7,12 @@ mod crypto;
 mod error;
 mod ip_tracker;
 #[cfg(test)]
-#[path = "tests/ip_tracker_hotpath_adversarial_tests.rs"]
-mod ip_tracker_hotpath_adversarial_tests;
-#[cfg(test)]
 #[path = "tests/ip_tracker_encapsulation_adversarial_tests.rs"]
 mod ip_tracker_encapsulation_adversarial_tests;
 #[cfg(test)]
+#[path = "tests/ip_tracker_hotpath_adversarial_tests.rs"]
+mod ip_tracker_hotpath_adversarial_tests;
+#[cfg(test)]
 #[path = "tests/ip_tracker_regression_tests.rs"]
 mod ip_tracker_regression_tests;
 mod maestro;

src/metrics.rs

@@ -1233,10 +1233,7 @@ async fn render_metrics(stats: &Stats, config: &ProxyConfig, ip_tracker: &UserIp
         out,
         "# HELP telemt_me_d2c_batch_bytes_bucket_total DC->Client batch byte size buckets"
     );
-    let _ = writeln!(
-        out,
-        "# TYPE telemt_me_d2c_batch_bytes_bucket_total counter"
-    );
+    let _ = writeln!(out, "# TYPE telemt_me_d2c_batch_bytes_bucket_total counter");
     let _ = writeln!(
         out,
         "telemt_me_d2c_batch_bytes_bucket_total{{bucket=\"0_1k\"}} {}",

src/proxy/client.rs

@@ -210,7 +210,9 @@ fn should_prefetch_mask_classifier_window(initial_data: &[u8]) -> bool {
         return false;
     }
 
-    initial_data.iter().all(|b| b.is_ascii_alphabetic() || *b == b' ')
+    initial_data
+        .iter()
+        .all(|b| b.is_ascii_alphabetic() || *b == b' ')
 }
 
 #[cfg(test)]
@@ -218,16 +220,19 @@ async fn extend_masking_initial_window<R>(reader: &mut R, initial_data: &mut Vec
 where
     R: AsyncRead + Unpin,
 {
-    extend_masking_initial_window_with_timeout(reader, initial_data, MASK_CLASSIFIER_PREFETCH_TIMEOUT)
-        .await;
+    extend_masking_initial_window_with_timeout(
+        reader,
+        initial_data,
+        MASK_CLASSIFIER_PREFETCH_TIMEOUT,
+    )
+    .await;
 }
 
 async fn extend_masking_initial_window_with_timeout<R>(
     reader: &mut R,
     initial_data: &mut Vec<u8>,
     prefetch_timeout: Duration,
-)
-where
+) where
     R: AsyncRead + Unpin,
 {
     if !should_prefetch_mask_classifier_window(initial_data) {
@@ -312,13 +317,20 @@ fn record_handshake_failure_class(
     record_beobachten_class(beobachten, config, peer_ip, class);
 }
 
+#[inline]
+fn increment_bad_on_unknown_tls_sni(stats: &Stats, error: &ProxyError) {
+    if matches!(error, ProxyError::UnknownTlsSni) {
+        stats.increment_connects_bad();
+    }
+}
+
 fn is_trusted_proxy_source(peer_ip: IpAddr, trusted: &[IpNetwork]) -> bool {
     if trusted.is_empty() {
         static EMPTY_PROXY_TRUST_WARNED: OnceLock<AtomicBool> = OnceLock::new();
         let warned = EMPTY_PROXY_TRUST_WARNED.get_or_init(|| AtomicBool::new(false));
         if !warned.swap(true, Ordering::Relaxed) {
             warn!(
-                "PROXY protocol enabled but server.proxy_protocol_trusted_cidrs is empty; rejecting all PROXY headers by default"
+                "PROXY protocol enabled but server.proxy_protocol_trusted_cidrs is empty; rejecting all PROXY headers"
             );
         }
         return false;
@@ -503,7 +515,10 @@ where
                         beobachten.clone(),
                     ));
                 }
-                HandshakeResult::Error(e) => return Err(e),
+                HandshakeResult::Error(e) => {
+                    increment_bad_on_unknown_tls_sni(stats.as_ref(), &e);
+                    return Err(e);
+                }
             };
 
             debug!(peer = %peer, "Reading MTProto handshake through TLS");
@@ -954,7 +969,10 @@ impl RunningClientHandler {
                     self.beobachten.clone(),
                 ));
             }
-            HandshakeResult::Error(e) => return Err(e),
+            HandshakeResult::Error(e) => {
+                increment_bad_on_unknown_tls_sni(stats.as_ref(), &e);
+                return Err(e);
+            }
         };
 
         debug!(peer = %peer, "Reading MTProto handshake through TLS");

src/proxy/handshake.rs

@@ -16,7 +16,7 @@ use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt};
 use tracing::{debug, trace, warn};
 use zeroize::{Zeroize, Zeroizing};
 
-use crate::config::ProxyConfig;
+use crate::config::{ProxyConfig, UnknownSniAction};
 use crate::crypto::{AesCtr, SecureRandom, sha256};
 use crate::error::{HandshakeResult, ProxyError};
 use crate::protocol::constants::*;
@@ -510,6 +510,21 @@ fn decode_user_secrets(
     secrets
 }
 
+#[inline]
+fn find_matching_tls_domain<'a>(config: &'a ProxyConfig, sni: &str) -> Option<&'a str> {
+    if config.censorship.tls_domain.eq_ignore_ascii_case(sni) {
+        return Some(config.censorship.tls_domain.as_str());
+    }
+
+    for domain in &config.censorship.tls_domains {
+        if domain.eq_ignore_ascii_case(sni) {
+            return Some(domain.as_str());
+        }
+    }
+
+    None
+}
+
 async fn maybe_apply_server_hello_delay(config: &ProxyConfig) {
     if config.censorship.server_hello_delay_max_ms == 0 {
         return;
@@ -593,6 +608,25 @@ where
     }
 
     let client_sni = tls::extract_sni_from_client_hello(handshake);
+    let matched_tls_domain = client_sni
+        .as_deref()
+        .and_then(|sni| find_matching_tls_domain(config, sni));
+
+    if client_sni.is_some() && matched_tls_domain.is_none() {
+        auth_probe_record_failure(peer.ip(), Instant::now());
+        maybe_apply_server_hello_delay(config).await;
+        debug!(
+            peer = %peer,
+            sni = ?client_sni,
+            action = ?config.censorship.unknown_sni_action,
+            "TLS handshake rejected by unknown SNI policy"
+        );
+        return match config.censorship.unknown_sni_action {
+            UnknownSniAction::Drop => HandshakeResult::Error(ProxyError::UnknownTlsSni),
+            UnknownSniAction::Mask => HandshakeResult::BadClient { reader, writer },
+        };
+    }
+
     let secrets = decode_user_secrets(config, client_sni.as_deref());
 
     let validation = match tls::validate_tls_handshake_with_replay_window(
@@ -633,16 +667,9 @@ where
 
     let cached = if config.censorship.tls_emulation {
         if let Some(cache) = tls_cache.as_ref() {
-            let selected_domain = if let Some(sni) = client_sni.as_ref() {
-                if cache.contains_domain(sni).await {
-                    sni.clone()
-                } else {
-                    config.censorship.tls_domain.clone()
-                }
-            } else {
-                config.censorship.tls_domain.clone()
-            };
-            let cached_entry = cache.get(&selected_domain).await;
+            let selected_domain =
+                matched_tls_domain.unwrap_or(config.censorship.tls_domain.as_str());
+            let cached_entry = cache.get(selected_domain).await;
             let use_full_cert_payload = cache
                 .take_full_cert_budget_for_ip(
                     peer.ip(),

src/proxy/masking.rs

@@ -10,10 +10,10 @@ use rand::rngs::StdRng;
 use rand::{Rng, RngExt, SeedableRng};
 use std::net::{IpAddr, SocketAddr};
 use std::str;
-#[cfg(unix)]
-use std::sync::{Mutex, OnceLock};
 #[cfg(test)]
 use std::sync::atomic::{AtomicUsize, Ordering};
+#[cfg(unix)]
+use std::sync::{Mutex, OnceLock};
 use std::time::{Duration, Instant as StdInstant};
 use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
 use tokio::net::TcpStream;
@@ -107,15 +107,7 @@ where
 fn is_http_probe(data: &[u8]) -> bool {
     // RFC 7540 section 3.5: HTTP/2 client preface starts with "PRI ".
     const HTTP_METHODS: [&[u8]; 10] = [
-        b"GET ",
-        b"POST",
-        b"HEAD",
-        b"PUT ",
-        b"DELETE",
-        b"OPTIONS",
-        b"CONNECT",
-        b"TRACE",
-        b"PATCH",
+        b"GET ", b"POST", b"HEAD", b"PUT ", b"DELETE", b"OPTIONS", b"CONNECT", b"TRACE", b"PATCH",
         b"PRI ",
     ];
 
@@ -328,7 +320,10 @@ fn parse_mask_host_ip_literal(host: &str) -> Option<IpAddr> {
 
 fn canonical_ip(ip: IpAddr) -> IpAddr {
     match ip {
-        IpAddr::V6(v6) => v6.to_ipv4_mapped().map(IpAddr::V4).unwrap_or(IpAddr::V6(v6)),
+        IpAddr::V6(v6) => v6
+            .to_ipv4_mapped()
+            .map(IpAddr::V4)
+            .unwrap_or(IpAddr::V6(v6)),
         IpAddr::V4(v4) => IpAddr::V4(v4),
     }
 }
@@ -664,12 +659,20 @@ pub async fn handle_bad_client<R, W>(
             Ok(Err(e)) => {
                 wait_mask_connect_budget_if_needed(connect_started, config).await;
                 debug!(error = %e, "Failed to connect to mask unix socket");
-                consume_client_data_with_timeout_and_cap(reader, config.censorship.mask_relay_max_bytes).await;
+                consume_client_data_with_timeout_and_cap(
+                    reader,
+                    config.censorship.mask_relay_max_bytes,
+                )
+                .await;
                 wait_mask_outcome_budget(outcome_started, config).await;
             }
             Err(_) => {
                 debug!("Timeout connecting to mask unix socket");
-                consume_client_data_with_timeout_and_cap(reader, config.censorship.mask_relay_max_bytes).await;
+                consume_client_data_with_timeout_and_cap(
+                    reader,
+                    config.censorship.mask_relay_max_bytes,
+                )
+                .await;
                 wait_mask_outcome_budget(outcome_started, config).await;
             }
         }
@@ -698,7 +701,8 @@ pub async fn handle_bad_client<R, W>(
             local = %local_addr,
             "Mask target resolves to local listener; refusing self-referential masking fallback"
         );
-        consume_client_data_with_timeout_and_cap(reader, config.censorship.mask_relay_max_bytes).await;
+        consume_client_data_with_timeout_and_cap(reader, config.censorship.mask_relay_max_bytes)
+            .await;
         wait_mask_outcome_budget(outcome_started, config).await;
         return;
     }
@@ -758,12 +762,20 @@ pub async fn handle_bad_client<R, W>(
         Ok(Err(e)) => {
             wait_mask_connect_budget_if_needed(connect_started, config).await;
             debug!(error = %e, "Failed to connect to mask host");
-            consume_client_data_with_timeout_and_cap(reader, config.censorship.mask_relay_max_bytes).await;
+            consume_client_data_with_timeout_and_cap(
+                reader,
+                config.censorship.mask_relay_max_bytes,
+            )
+            .await;
             wait_mask_outcome_budget(outcome_started, config).await;
         }
         Err(_) => {
             debug!("Timeout connecting to mask host");
-            consume_client_data_with_timeout_and_cap(reader, config.censorship.mask_relay_max_bytes).await;
+            consume_client_data_with_timeout_and_cap(
+                reader,
+                config.censorship.mask_relay_max_bytes,
+            )
+            .await;
             wait_mask_outcome_budget(outcome_started, config).await;
         }
     }

src/proxy/middle_relay.rs

@@ -23,7 +23,9 @@ use crate::proxy::route_mode::{
     ROUTE_SWITCH_ERROR_MSG, RelayRouteMode, RouteCutoverState, affected_cutover_state,
     cutover_stagger_delay,
 };
-use crate::stats::{MeD2cFlushReason, MeD2cQuotaRejectStage, MeD2cWriteMode, QuotaReserveError, Stats, UserStats};
+use crate::stats::{
+    MeD2cFlushReason, MeD2cQuotaRejectStage, MeD2cWriteMode, QuotaReserveError, Stats, UserStats,
+};
 use crate::stream::{BufferPool, CryptoReader, CryptoWriter, PooledBuffer};
 use crate::transport::middle_proxy::{MePool, MeResponse, proto_flags_for_tag};
 
@@ -91,7 +93,8 @@ fn relay_idle_candidate_registry() -> &'static Mutex<RelayIdleCandidateRegistry>
     RELAY_IDLE_CANDIDATE_REGISTRY.get_or_init(|| Mutex::new(RelayIdleCandidateRegistry::default()))
 }
 
-fn relay_idle_candidate_registry_lock() -> std::sync::MutexGuard<'static, RelayIdleCandidateRegistry> {
+fn relay_idle_candidate_registry_lock() -> std::sync::MutexGuard<'static, RelayIdleCandidateRegistry>
+{
     let registry = relay_idle_candidate_registry();
     match registry.lock() {
         Ok(guard) => guard,
@@ -1520,8 +1523,7 @@ where
             }
 
             if !idle_policy.enabled {
-                consecutive_zero_len_frames =
-                    consecutive_zero_len_frames.saturating_add(1);
+                consecutive_zero_len_frames = consecutive_zero_len_frames.saturating_add(1);
                 if consecutive_zero_len_frames > LEGACY_MAX_CONSECUTIVE_ZERO_LEN_FRAMES {
                     stats.increment_relay_protocol_desync_close_total();
                     return Err(ProxyError::Proxy(
@@ -1835,8 +1837,14 @@ where
                     MeD2cWriteMode::Coalesced
                 } else {
                     let header = [first];
-                    client_writer.write_all(&header).await.map_err(ProxyError::Io)?;
-                    client_writer.write_all(data).await.map_err(ProxyError::Io)?;
+                    client_writer
+                        .write_all(&header)
+                        .await
+                        .map_err(ProxyError::Io)?;
+                    client_writer
+                        .write_all(data)
+                        .await
+                        .map_err(ProxyError::Io)?;
                     MeD2cWriteMode::Split
                 }
             } else if len_words < (1 << 24) {
@@ -1858,8 +1866,14 @@ where
                     MeD2cWriteMode::Coalesced
                 } else {
                     let header = [first, lw[0], lw[1], lw[2]];
-                    client_writer.write_all(&header).await.map_err(ProxyError::Io)?;
-                    client_writer.write_all(data).await.map_err(ProxyError::Io)?;
+                    client_writer
+                        .write_all(&header)
+                        .await
+                        .map_err(ProxyError::Io)?;
+                    client_writer
+                        .write_all(data)
+                        .await
+                        .map_err(ProxyError::Io)?;
                     MeD2cWriteMode::Split
                 }
             } else {
@@ -1901,8 +1915,14 @@ where
                 MeD2cWriteMode::Coalesced
             } else {
                 let header = len_val.to_le_bytes();
-                client_writer.write_all(&header).await.map_err(ProxyError::Io)?;
-                client_writer.write_all(data).await.map_err(ProxyError::Io)?;
+                client_writer
+                    .write_all(&header)
+                    .await
+                    .map_err(ProxyError::Io)?;
+                client_writer
+                    .write_all(data)
+                    .await
+                    .map_err(ProxyError::Io)?;
                 if padding_len > 0 {
                     frame_buf.clear();
                     if frame_buf.capacity() < padding_len {
@@ -1977,3 +1997,7 @@ mod middle_relay_tiny_frame_debt_concurrency_security_tests;
 #[cfg(test)]
 #[path = "tests/middle_relay_tiny_frame_debt_proto_chunking_security_tests.rs"]
 mod middle_relay_tiny_frame_debt_proto_chunking_security_tests;
+
+#[cfg(test)]
+#[path = "tests/middle_relay_atomic_quota_invariant_tests.rs"]
+mod middle_relay_atomic_quota_invariant_tests;

src/proxy/mod.rs

@@ -4,58 +4,58 @@
 #![cfg_attr(test, allow(warnings))]
 #![cfg_attr(not(test), forbid(clippy::undocumented_unsafe_blocks))]
 #![cfg_attr(
-	not(test),
-	deny(
-		clippy::unwrap_used,
-		clippy::expect_used,
-		clippy::panic,
-		clippy::todo,
-		clippy::unimplemented,
-		clippy::correctness,
-		clippy::option_if_let_else,
-		clippy::or_fun_call,
-		clippy::branches_sharing_code,
-		clippy::single_option_map,
-		clippy::useless_let_if_seq,
-		clippy::redundant_locals,
-		clippy::cloned_ref_to_slice_refs,
-		unsafe_code,
-		clippy::await_holding_lock,
-		clippy::await_holding_refcell_ref,
-		clippy::debug_assert_with_mut_call,
-		clippy::macro_use_imports,
-		clippy::cast_ptr_alignment,
-		clippy::cast_lossless,
-		clippy::ptr_as_ptr,
-		clippy::large_stack_arrays,
-		clippy::same_functions_in_if_condition,
-		trivial_casts,
-		trivial_numeric_casts,
-		unused_extern_crates,
-		unused_import_braces,
-		rust_2018_idioms
-	)
+    not(test),
+    deny(
+        clippy::unwrap_used,
+        clippy::expect_used,
+        clippy::panic,
+        clippy::todo,
+        clippy::unimplemented,
+        clippy::correctness,
+        clippy::option_if_let_else,
+        clippy::or_fun_call,
+        clippy::branches_sharing_code,
+        clippy::single_option_map,
+        clippy::useless_let_if_seq,
+        clippy::redundant_locals,
+        clippy::cloned_ref_to_slice_refs,
+        unsafe_code,
+        clippy::await_holding_lock,
+        clippy::await_holding_refcell_ref,
+        clippy::debug_assert_with_mut_call,
+        clippy::macro_use_imports,
+        clippy::cast_ptr_alignment,
+        clippy::cast_lossless,
+        clippy::ptr_as_ptr,
+        clippy::large_stack_arrays,
+        clippy::same_functions_in_if_condition,
+        trivial_casts,
+        trivial_numeric_casts,
+        unused_extern_crates,
+        unused_import_braces,
+        rust_2018_idioms
+    )
 )]
 #![cfg_attr(
-	not(test),
-	allow(
-		clippy::use_self,
-		clippy::redundant_closure,
-		clippy::too_many_arguments,
-		clippy::doc_markdown,
-		clippy::missing_const_for_fn,
-		clippy::unnecessary_operation,
-		clippy::redundant_pub_crate,
-		clippy::derive_partial_eq_without_eq,
-		clippy::type_complexity,
-		clippy::new_ret_no_self,
-		clippy::cast_possible_truncation,
-		clippy::cast_possible_wrap,
-		clippy::significant_drop_tightening,
-		clippy::significant_drop_in_scrutinee,
-		clippy::float_cmp,
-		clippy::nursery
-	)
+    not(test),
+    allow(
+        clippy::use_self,
+        clippy::redundant_closure,
+        clippy::too_many_arguments,
+        clippy::doc_markdown,
+        clippy::missing_const_for_fn,
+        clippy::unnecessary_operation,
+        clippy::redundant_pub_crate,
+        clippy::derive_partial_eq_without_eq,
+        clippy::type_complexity,
+        clippy::new_ret_no_self,
+        clippy::cast_possible_truncation,
+        clippy::cast_possible_wrap,
+        clippy::significant_drop_tightening,
+        clippy::significant_drop_in_scrutinee,
+        clippy::float_cmp,
+        clippy::nursery
+    )
 )]
 
 pub mod adaptive_buffers;

src/proxy/relay.rs

@@ -56,8 +56,8 @@ use crate::stats::{Stats, UserStats};
 use crate::stream::BufferPool;
 use std::io;
 use std::pin::Pin;
-use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
 use std::sync::Arc;
+use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
 use std::task::{Context, Poll};
 use std::time::Duration;
 use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt, ReadBuf, copy_bidirectional_with_sizes};
@@ -272,12 +272,10 @@ const QUOTA_ADAPTIVE_INTERVAL_MAX_BYTES: u64 = 64 * 1024;
 
 #[inline]
 fn quota_adaptive_interval_bytes(remaining_before: u64) -> u64 {
-    remaining_before
-        .saturating_div(2)
-        .clamp(
-            QUOTA_ADAPTIVE_INTERVAL_MIN_BYTES,
-            QUOTA_ADAPTIVE_INTERVAL_MAX_BYTES,
-        )
+    remaining_before.saturating_div(2).clamp(
+        QUOTA_ADAPTIVE_INTERVAL_MIN_BYTES,
+        QUOTA_ADAPTIVE_INTERVAL_MAX_BYTES,
+    )
 }
 
 #[inline]
@@ -669,3 +667,7 @@ mod relay_quota_extended_attack_surface_security_tests;
 #[cfg(test)]
 #[path = "tests/relay_watchdog_delta_security_tests.rs"]
 mod relay_watchdog_delta_security_tests;
+
+#[cfg(test)]
+#[path = "tests/relay_atomic_quota_invariant_tests.rs"]
+mod relay_atomic_quota_invariant_tests;

src/proxy/tests/client_clever_advanced_tests.rs

@@ -1,5 +1,5 @@
 use super::*;
-use crate::config::{UpstreamConfig, UpstreamType, ProxyConfig};
+use crate::config::{ProxyConfig, UpstreamConfig, UpstreamType};
 use crate::protocol::constants::{MAX_TLS_PLAINTEXT_SIZE, MIN_TLS_CLIENT_HELLO_SIZE};
 use crate::stats::Stats;
 use crate::transport::UpstreamManager;
@@ -41,7 +41,9 @@ fn edge_handshake_timeout_with_mask_grace_saturating_add_prevents_overflow() {
 #[test]
 fn edge_tls_clienthello_len_in_bounds_exact_boundaries() {
     assert!(tls_clienthello_len_in_bounds(MIN_TLS_CLIENT_HELLO_SIZE));
-    assert!(!tls_clienthello_len_in_bounds(MIN_TLS_CLIENT_HELLO_SIZE - 1));
+    assert!(!tls_clienthello_len_in_bounds(
+        MIN_TLS_CLIENT_HELLO_SIZE - 1
+    ));
     assert!(tls_clienthello_len_in_bounds(MAX_TLS_PLAINTEXT_SIZE));
     assert!(!tls_clienthello_len_in_bounds(MAX_TLS_PLAINTEXT_SIZE + 1));
 }
@@ -87,7 +89,15 @@ async fn adversarial_tls_handshake_timeout_during_masking_delay() {
         "198.51.100.1:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),
@@ -99,7 +109,10 @@ async fn adversarial_tls_handshake_timeout_during_masking_delay() {
         false,
     ));
 
-    client_side.write_all(&[0x16, 0x03, 0x01, 0xFF, 0xFF]).await.unwrap();
+    client_side
+        .write_all(&[0x16, 0x03, 0x01, 0xFF, 0xFF])
+        .await
+        .unwrap();
 
     let result = tokio::time::timeout(Duration::from_secs(4), handle)
         .await
@@ -123,7 +136,15 @@ async fn blackhat_proxy_protocol_slowloris_timeout() {
         "198.51.100.2:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),
@@ -167,7 +188,15 @@ async fn negative_proxy_protocol_enabled_but_client_sends_tls_hello() {
         "198.51.100.3:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),
@@ -179,7 +208,10 @@ async fn negative_proxy_protocol_enabled_but_client_sends_tls_hello() {
         true,
     ));
 
-    client_side.write_all(&[0x16, 0x03, 0x01, 0x02, 0x00]).await.unwrap();
+    client_side
+        .write_all(&[0x16, 0x03, 0x01, 0x02, 0x00])
+        .await
+        .unwrap();
 
     let result = tokio::time::timeout(Duration::from_secs(2), handle)
         .await
@@ -202,7 +234,15 @@ async fn edge_client_stream_exactly_4_bytes_eof() {
         "198.51.100.4:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),
@@ -214,7 +254,10 @@ async fn edge_client_stream_exactly_4_bytes_eof() {
         false,
     ));
 
-    client_side.write_all(&[0x16, 0x03, 0x01, 0x00]).await.unwrap();
+    client_side
+        .write_all(&[0x16, 0x03, 0x01, 0x00])
+        .await
+        .unwrap();
     client_side.shutdown().await.unwrap();
 
     let _ = tokio::time::timeout(Duration::from_secs(2), handle).await;
@@ -234,7 +277,15 @@ async fn edge_client_stream_tls_header_valid_but_body_1_byte_short_eof() {
         "198.51.100.5:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),
@@ -246,7 +297,10 @@ async fn edge_client_stream_tls_header_valid_but_body_1_byte_short_eof() {
         false,
     ));
 
-    client_side.write_all(&[0x16, 0x03, 0x01, 0x00, 100]).await.unwrap();
+    client_side
+        .write_all(&[0x16, 0x03, 0x01, 0x00, 100])
+        .await
+        .unwrap();
     client_side.write_all(&vec![0x41; 99]).await.unwrap();
     client_side.shutdown().await.unwrap();
 
@@ -269,7 +323,15 @@ async fn integration_non_tls_modes_disabled_immediately_masks() {
         "198.51.100.6:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),
@@ -372,11 +434,7 @@ async fn stress_user_connection_reservation_concurrent_same_ip_exhaustion() {
         let ip_tracker = ip_tracker.clone();
         tasks.spawn(async move {
             RunningClientHandler::acquire_user_connection_reservation_static(
-                user,
-                &config,
-                stats,
-                peer,
-                ip_tracker,
+                user, &config, stats, peer, ip_tracker,
             )
             .await
         });

src/proxy/tests/client_deep_invariants_tests.rs

@@ -7,6 +7,11 @@ use std::sync::Arc;
 use std::time::Duration;
 use tokio::io::{AsyncWriteExt, duplex};
 
+fn preload_user_quota(stats: &Stats, user: &str, bytes: u64) {
+    let user_stats = stats.get_or_create_user_stats_handle(user);
+    stats.quota_charge_post_write(user_stats.as_ref(), bytes);
+}
+
 #[test]
 fn invariant_wrap_tls_application_record_exact_multiples() {
     let chunk_size = u16::MAX as usize;
@@ -37,7 +42,15 @@ async fn invariant_tls_clienthello_truncation_exact_boundary_triggers_masking()
         "198.51.100.20:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),
@@ -60,7 +73,9 @@ async fn invariant_tls_clienthello_truncation_exact_boundary_triggers_masking()
         .unwrap();
     client_side.shutdown().await.unwrap();
 
-    let _ = tokio::time::timeout(Duration::from_secs(2), handler).await.unwrap();
+    let _ = tokio::time::timeout(Duration::from_secs(2), handler)
+        .await
+        .unwrap();
     assert_eq!(stats.get_connects_bad(), 1);
 }
 
@@ -68,7 +83,10 @@ async fn invariant_tls_clienthello_truncation_exact_boundary_triggers_masking()
 async fn invariant_acquire_reservation_ip_limit_rollback() {
     let user = "rollback-test-user";
     let mut config = ProxyConfig::default();
-    config.access.user_max_tcp_conns.insert(user.to_string(), 10);
+    config
+        .access
+        .user_max_tcp_conns
+        .insert(user.to_string(), 10);
 
     let stats = Arc::new(Stats::new());
     let ip_tracker = Arc::new(UserIpTracker::new());
@@ -114,7 +132,7 @@ async fn invariant_quota_exact_boundary_inclusive() {
     let ip_tracker = Arc::new(UserIpTracker::new());
     let peer = "198.51.100.23:55000".parse().unwrap();
 
-    stats.add_user_octets_from(user, 999);
+    preload_user_quota(stats.as_ref(), user, 999);
     let res1 = RunningClientHandler::acquire_user_connection_reservation_static(
         user,
         &config,
@@ -126,7 +144,7 @@ async fn invariant_quota_exact_boundary_inclusive() {
     assert!(res1.is_ok());
     res1.unwrap().release().await;
 
-    stats.add_user_octets_from(user, 1);
+    preload_user_quota(stats.as_ref(), user, 1);
     let res2 = RunningClientHandler::acquire_user_connection_reservation_static(
         user,
         &config,
@@ -154,7 +172,15 @@ async fn invariant_direct_mode_partial_header_eof_is_error_not_bad_connect() {
         "198.51.100.25:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),

src/proxy/tests/client_masking_http2_fragmented_preface_security_tests.rs

@@ -100,14 +100,7 @@ async fn run_http2_fragment_case(split_at: usize, delay_ms: u64, peer: SocketAdd
 
 #[tokio::test]
 async fn http2_preface_fragmentation_matrix_is_classified_and_forwarded() {
-    let cases = [
-        (2usize, 0u64),
-        (3, 0),
-        (4, 0),
-        (2, 7),
-        (3, 7),
-        (8, 1),
-    ];
+    let cases = [(2usize, 0u64), (3, 0), (4, 0), (2, 7), (3, 7), (8, 1)];
 
     for (i, (split_at, delay_ms)) in cases.into_iter().enumerate() {
         let peer: SocketAddr = format!("198.51.100.{}:58{}", 140 + i, 100 + i)

src/proxy/tests/client_masking_prefetch_config_runtime_security_tests.rs

@@ -29,7 +29,10 @@ async fn configured_prefetch_budget_20ms_recovers_tail_delayed_15ms() {
             .write_all(b"ONNECT example.org:443 HTTP/1.1\r\n")
             .await
             .expect("tail bytes must be writable");
-        writer.shutdown().await.expect("writer shutdown must succeed");
+        writer
+            .shutdown()
+            .await
+            .expect("writer shutdown must succeed");
     });
 
     let mut initial_data = b"C".to_vec();
@@ -60,7 +63,10 @@ async fn configured_prefetch_budget_5ms_misses_tail_delayed_15ms() {
             .write_all(b"ONNECT example.org:443 HTTP/1.1\r\n")
             .await
             .expect("tail bytes must be writable");
-        writer.shutdown().await.expect("writer shutdown must succeed");
+        writer
+            .shutdown()
+            .await
+            .expect("writer shutdown must succeed");
     });
 
     let mut initial_data = b"C".to_vec();

src/proxy/tests/client_masking_prefetch_invariant_security_tests.rs

@@ -245,7 +245,10 @@ async fn blackhat_integration_empty_initial_data_path_is_byte_exact_and_eof_clea
     assert_eq!(head[0], 0x16);
     read_and_discard_tls_record_body(&mut client_side, head).await;
 
-    client_side.write_all(&invalid_mtproto_record).await.unwrap();
+    client_side
+        .write_all(&invalid_mtproto_record)
+        .await
+        .unwrap();
     client_side.write_all(&trailing_record).await.unwrap();
     client_side.shutdown().await.unwrap();
 

src/proxy/tests/client_masking_prefetch_strict_boundary_security_tests.rs

@@ -7,7 +7,9 @@ async fn run_strict_prefetch_case(prefetch_ms: u64, tail_delay_ms: u64) -> Vec<u
 
     let writer_task = tokio::spawn(async move {
         sleep(Duration::from_millis(tail_delay_ms)).await;
-        let _ = writer.write_all(b"ONNECT example.org:443 HTTP/1.1\r\n").await;
+        let _ = writer
+            .write_all(b"ONNECT example.org:443 HTTP/1.1\r\n")
+            .await;
         let _ = writer.shutdown().await;
     });
 

src/proxy/tests/client_masking_prefetch_timing_matrix_security_tests.rs

@@ -35,7 +35,10 @@ async fn run_prefetch_budget_case(prefetch_budget_ms: u64, delayed_tail_ms: u64)
             .write_all(b"ONNECT example.org:443 HTTP/1.1\r\n")
             .await
             .expect("tail bytes must be writable");
-        writer.shutdown().await.expect("writer shutdown must succeed");
+        writer
+            .shutdown()
+            .await
+            .expect("writer shutdown must succeed");
     });
 
     let mut initial_data = b"C".to_vec();

src/proxy/tests/client_masking_replay_timing_security_tests.rs

@@ -67,9 +67,10 @@ async fn run_replay_candidate_session(
     cfg.censorship.mask_port = 1;
     cfg.censorship.mask_timing_normalization_enabled = false;
     cfg.access.ignore_time_skew = true;
-    cfg.access
-        .users
-        .insert("user".to_string(), "abababababababababababababababab".to_string());
+    cfg.access.users.insert(
+        "user".to_string(),
+        "abababababababababababababababab".to_string(),
+    );
 
     let config = Arc::new(cfg);
     let stats = Arc::new(Stats::new());
@@ -99,7 +100,10 @@ async fn run_replay_candidate_session(
 
     if drive_mtproto_fail {
         let mut server_hello_head = [0u8; 5];
-        client_side.read_exact(&mut server_hello_head).await.unwrap();
+        client_side
+            .read_exact(&mut server_hello_head)
+            .await
+            .unwrap();
         assert_eq!(server_hello_head[0], 0x16);
         let body_len = u16::from_be_bytes([server_hello_head[3], server_hello_head[4]]) as usize;
         let mut body = vec![0u8; body_len];
@@ -110,7 +114,10 @@ async fn run_replay_candidate_session(
         invalid_mtproto_record.extend_from_slice(&TLS_VERSION);
         invalid_mtproto_record.extend_from_slice(&(HANDSHAKE_LEN as u16).to_be_bytes());
         invalid_mtproto_record.extend_from_slice(&vec![0u8; HANDSHAKE_LEN]);
-        client_side.write_all(&invalid_mtproto_record).await.unwrap();
+        client_side
+            .write_all(&invalid_mtproto_record)
+            .await
+            .unwrap();
         client_side
             .write_all(b"GET /replay-fallback HTTP/1.1\r\nHost: x\r\n\r\n")
             .await
@@ -154,8 +161,7 @@ async fn replay_reject_still_honors_masking_timing_budget() {
     .await;
 
     assert!(
-        replay_elapsed >= Duration::from_millis(40)
-            && replay_elapsed < Duration::from_millis(250),
+        replay_elapsed >= Duration::from_millis(40) && replay_elapsed < Duration::from_millis(250),
         "replay rejection path must still satisfy masking timing budget without unbounded DB/CPU delay"
     );
 }

src/proxy/tests/client_more_advanced_tests.rs

@@ -6,6 +6,11 @@ use std::sync::Arc;
 use std::time::Duration;
 use tokio::io::{AsyncReadExt, AsyncWriteExt, duplex};
 
+fn preload_user_quota(stats: &Stats, user: &str, bytes: u64) {
+    let user_stats = stats.get_or_create_user_stats_handle(user);
+    stats.quota_charge_post_write(user_stats.as_ref(), bytes);
+}
+
 #[tokio::test]
 async fn edge_mask_delay_bypassed_if_max_is_zero() {
     let mut config = ProxyConfig::default();
@@ -42,17 +47,13 @@ async fn boundary_user_data_quota_exact_match_rejects() {
     config.access.user_data_quota.insert(user.to_string(), 1024);
 
     let stats = Arc::new(Stats::new());
-    stats.add_user_octets_from(user, 1024);
+    preload_user_quota(stats.as_ref(), user, 1024);
 
     let ip_tracker = Arc::new(UserIpTracker::new());
     let peer = "198.51.100.10:55000".parse().unwrap();
 
     let result = RunningClientHandler::acquire_user_connection_reservation_static(
-        user,
-        &config,
-        stats,
-        peer,
-        ip_tracker,
+        user, &config, stats, peer, ip_tracker,
     )
     .await;
 
@@ -74,11 +75,7 @@ async fn boundary_user_expiration_in_past_rejects() {
     let peer = "198.51.100.11:55000".parse().unwrap();
 
     let result = RunningClientHandler::acquire_user_connection_reservation_static(
-        user,
-        &config,
-        stats,
-        peer,
-        ip_tracker,
+        user, &config, stats, peer, ip_tracker,
     )
     .await;
 
@@ -98,7 +95,15 @@ async fn blackhat_proxy_protocol_massive_garbage_rejected_quickly() {
         "198.51.100.12:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),
@@ -136,7 +141,15 @@ async fn edge_tls_body_immediate_eof_triggers_masking_and_bad_connect() {
         "198.51.100.13:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),
@@ -148,10 +161,15 @@ async fn edge_tls_body_immediate_eof_triggers_masking_and_bad_connect() {
         false,
     ));
 
-    client_side.write_all(&[0x16, 0x03, 0x01, 0x00, 100]).await.unwrap();
+    client_side
+        .write_all(&[0x16, 0x03, 0x01, 0x00, 100])
+        .await
+        .unwrap();
     client_side.shutdown().await.unwrap();
 
-    let _ = tokio::time::timeout(Duration::from_secs(2), handler).await.unwrap();
+    let _ = tokio::time::timeout(Duration::from_secs(2), handler)
+        .await
+        .unwrap();
 
     assert_eq!(stats.get_connects_bad(), 1);
 }
@@ -172,7 +190,15 @@ async fn security_classic_mode_disabled_masks_valid_length_payload() {
         "198.51.100.15:55000".parse().unwrap(),
         config,
         stats.clone(),
-        Arc::new(UpstreamManager::new(vec![], 1, 1, 1, 1, false, stats.clone())),
+        Arc::new(UpstreamManager::new(
+            vec![],
+            1,
+            1,
+            1,
+            1,
+            false,
+            stats.clone(),
+        )),
         Arc::new(ReplayChecker::new(128, Duration::from_secs(60))),
         Arc::new(BufferPool::new()),
         Arc::new(SecureRandom::new()),
@@ -187,7 +213,9 @@ async fn security_classic_mode_disabled_masks_valid_length_payload() {
     client_side.write_all(&vec![0xEF; 64]).await.unwrap();
     client_side.shutdown().await.unwrap();
 
-    let _ = tokio::time::timeout(Duration::from_secs(2), handler).await.unwrap();
+    let _ = tokio::time::timeout(Duration::from_secs(2), handler)
+        .await
+        .unwrap();
     assert_eq!(stats.get_connects_bad(), 1);
 }
 
@@ -195,7 +223,10 @@ async fn security_classic_mode_disabled_masks_valid_length_payload() {
 async fn concurrency_ip_tracker_strict_limit_one_rapid_churn() {
     let user = "rapid-churn-user";
     let mut config = ProxyConfig::default();
-    config.access.user_max_tcp_conns.insert(user.to_string(), 10);
+    config
+        .access
+        .user_max_tcp_conns
+        .insert(user.to_string(), 10);
 
     let stats = Arc::new(Stats::new());
     let ip_tracker = Arc::new(UserIpTracker::new());

src/proxy/tests/client_security_tests.rs

@@ -7,9 +7,9 @@ use crate::protocol::tls;
 use crate::proxy::handshake::HandshakeSuccess;
 use crate::stream::{CryptoReader, CryptoWriter};
 use crate::transport::proxy_protocol::ProxyProtocolV1Builder;
-use rand::rngs::StdRng;
 use rand::Rng;
 use rand::SeedableRng;
+use rand::rngs::StdRng;
 use std::net::Ipv4Addr;
 use tokio::io::{AsyncReadExt, AsyncWriteExt, duplex};
 use tokio::net::{TcpListener, TcpStream};
@@ -34,7 +34,10 @@ fn handshake_timeout_with_mask_grace_includes_mask_margin() {
     config.timeouts.client_handshake = 2;
 
     config.censorship.mask = false;
-    assert_eq!(handshake_timeout_with_mask_grace(&config), Duration::from_secs(2));
+    assert_eq!(
+        handshake_timeout_with_mask_grace(&config),
+        Duration::from_secs(2)
+    );
 
     config.censorship.mask = true;
     assert_eq!(
@@ -86,7 +89,10 @@ impl tokio::io::AsyncRead for ErrorReader {
         _cx: &mut std::task::Context<'_>,
         _buf: &mut tokio::io::ReadBuf<'_>,
     ) -> std::task::Poll<std::io::Result<()>> {
-        std::task::Poll::Ready(Err(std::io::Error::new(std::io::ErrorKind::UnexpectedEof, "fake error")))
+        std::task::Poll::Ready(Err(std::io::Error::new(
+            std::io::ErrorKind::UnexpectedEof,
+            "fake error",
+        )))
     }
 }
 
@@ -124,7 +130,10 @@ fn handshake_timeout_without_mask_is_exact_base() {
     config.timeouts.client_handshake = 7;
     config.censorship.mask = false;
 
-    assert_eq!(handshake_timeout_with_mask_grace(&config), Duration::from_secs(7));
+    assert_eq!(
+        handshake_timeout_with_mask_grace(&config),
+        Duration::from_secs(7)
+    );
 }
 
 #[test]
@@ -133,7 +142,10 @@ fn handshake_timeout_mask_enabled_adds_750ms() {
     config.timeouts.client_handshake = 3;
     config.censorship.mask = true;
 
-    assert_eq!(handshake_timeout_with_mask_grace(&config), Duration::from_millis(3750));
+    assert_eq!(
+        handshake_timeout_with_mask_grace(&config),
+        Duration::from_millis(3750)
+    );
 }
 
 #[tokio::test]
@@ -155,10 +167,12 @@ async fn read_with_progress_fragmented_io_works_over_multiple_calls() {
         let mut b = vec![0u8; chunk_size];
         let n = read_with_progress(&mut cursor, &mut b).await.unwrap();
         result.extend_from_slice(&b[..n]);
-        if n == 0 { break; }
+        if n == 0 {
+            break;
+        }
     }
 
-    assert_eq!(result, vec![1,2,3,4,5]);
+    assert_eq!(result, vec![1, 2, 3, 4, 5]);
 }
 
 #[tokio::test]
@@ -174,7 +188,9 @@ async fn read_with_progress_stress_randomized_chunk_sizes() {
             let mut b = vec![0u8; chunk];
             let read = read_with_progress(&mut cursor, &mut b).await.unwrap();
             collected.extend_from_slice(&b[..read]);
-            if read == 0 { break; }
+            if read == 0 {
+                break;
+            }
         }
 
         assert_eq!(collected, input);
@@ -215,10 +231,12 @@ fn wrap_tls_application_record_roundtrip_size_check() {
     let mut consumed = 0;
     while idx + 5 <= wrapped.len() {
         assert_eq!(wrapped[idx], 0x17);
-        let len = u16::from_be_bytes([wrapped[idx+3], wrapped[idx+4]]) as usize;
+        let len = u16::from_be_bytes([wrapped[idx + 3], wrapped[idx + 4]]) as usize;
         consumed += len;
         idx += 5 + len;
-        if idx >= wrapped.len() { break; }
+        if idx >= wrapped.len() {
+            break;
+        }
     }
 
     assert_eq!(consumed, payload_len);
@@ -242,6 +260,11 @@ where
     CryptoWriter::new(writer, AesCtr::new(&key, iv), 8 * 1024)
 }
 
+fn preload_user_quota(stats: &Stats, user: &str, bytes: u64) {
+    let user_stats = stats.get_or_create_user_stats_handle(user);
+    stats.quota_charge_post_write(user_stats.as_ref(), bytes);
+}
+
 #[tokio::test]
 async fn user_connection_reservation_drop_enqueues_cleanup_synchronously() {
     let ip_tracker = Arc::new(crate::ip_tracker::UserIpTracker::new());
@@ -3040,7 +3063,7 @@ async fn quota_rejection_does_not_reserve_ip_or_trigger_rollback() {
         .insert("user".to_string(), 1024);
 
     let stats = Stats::new();
-    stats.add_user_octets_from("user", 1024);
+    preload_user_quota(&stats, "user", 1024);
 
     let ip_tracker = UserIpTracker::new();
     let peer_addr: SocketAddr = "203.0.113.211:50001".parse().unwrap();

src/proxy/tests/client_tls_record_wrap_hardening_security_tests.rs

@@ -25,13 +25,26 @@ fn wrap_tls_application_record_oversized_payload_is_chunked_without_truncation()
         let len = u16::from_be_bytes([record[offset + 3], record[offset + 4]]) as usize;
         let body_start = offset + 5;
         let body_end = body_start + len;
-        assert!(body_end <= record.len(), "declared TLS record length must be in-bounds");
+        assert!(
+            body_end <= record.len(),
+            "declared TLS record length must be in-bounds"
+        );
         recovered.extend_from_slice(&record[body_start..body_end]);
         offset = body_end;
         frames += 1;
     }
 
-    assert_eq!(offset, record.len(), "record parser must consume exact output size");
-    assert_eq!(frames, 2, "oversized payload should split into exactly two records");
-    assert_eq!(recovered, payload, "chunked records must preserve full payload");
+    assert_eq!(
+        offset,
+        record.len(),
+        "record parser must consume exact output size"
+    );
+    assert_eq!(
+        frames, 2,
+        "oversized payload should split into exactly two records"
+    );
+    assert_eq!(
+        recovered, payload,
+        "chunked records must preserve full payload"
+    );
 }

src/proxy/tests/direct_relay_security_tests.rs

@@ -773,8 +773,7 @@ fn anchored_open_nix_path_writes_expected_lines() {
         "target/telemt-unknown-dc-anchored-open-ok-{}/unknown-dc.log",
         std::process::id()
     );
-    let sanitized =
-        sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
+    let sanitized = sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
     let _ = fs::remove_file(&sanitized.resolved_path);
 
     let mut first = open_unknown_dc_log_append_anchored(&sanitized)
@@ -787,7 +786,10 @@ fn anchored_open_nix_path_writes_expected_lines() {
 
     let content =
         fs::read_to_string(&sanitized.resolved_path).expect("anchored log file must be readable");
-    let lines: Vec<&str> = content.lines().filter(|line| !line.trim().is_empty()).collect();
+    let lines: Vec<&str> = content
+        .lines()
+        .filter(|line| !line.trim().is_empty())
+        .collect();
     assert_eq!(lines.len(), 2, "expected one line per anchored append call");
     assert!(
         lines.contains(&"dc_idx=31200") && lines.contains(&"dc_idx=31201"),
@@ -811,8 +813,7 @@ fn anchored_open_parallel_appends_preserve_line_integrity() {
         "target/telemt-unknown-dc-anchored-open-parallel-{}/unknown-dc.log",
         std::process::id()
     );
-    let sanitized =
-        sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
+    let sanitized = sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
     let _ = fs::remove_file(&sanitized.resolved_path);
 
     let mut workers = Vec::new();
@@ -831,8 +832,15 @@ fn anchored_open_parallel_appends_preserve_line_integrity() {
 
     let content =
         fs::read_to_string(&sanitized.resolved_path).expect("parallel log file must be readable");
-    let lines: Vec<&str> = content.lines().filter(|line| !line.trim().is_empty()).collect();
-    assert_eq!(lines.len(), 64, "expected one complete line per worker append");
+    let lines: Vec<&str> = content
+        .lines()
+        .filter(|line| !line.trim().is_empty())
+        .collect();
+    assert_eq!(
+        lines.len(),
+        64,
+        "expected one complete line per worker append"
+    );
     for line in lines {
         assert!(
             line.starts_with("dc_idx="),
@@ -867,8 +875,7 @@ fn anchored_open_creates_private_0600_file_permissions() {
         "target/telemt-unknown-dc-anchored-perms-{}/unknown-dc.log",
         std::process::id()
     );
-    let sanitized =
-        sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
+    let sanitized = sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
     let _ = fs::remove_file(&sanitized.resolved_path);
 
     let mut file = open_unknown_dc_log_append_anchored(&sanitized)
@@ -905,8 +912,7 @@ fn anchored_open_rejects_existing_symlink_target() {
         "target/telemt-unknown-dc-anchored-symlink-target-{}/unknown-dc.log",
         std::process::id()
     );
-    let sanitized =
-        sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
+    let sanitized = sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
 
     let outside = std::env::temp_dir().join(format!(
         "telemt-unknown-dc-anchored-symlink-outside-{}.log",
@@ -943,8 +949,7 @@ fn anchored_open_high_contention_multi_write_preserves_complete_lines() {
         "target/telemt-unknown-dc-anchored-contention-{}/unknown-dc.log",
         std::process::id()
     );
-    let sanitized =
-        sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
+    let sanitized = sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
     let _ = fs::remove_file(&sanitized.resolved_path);
 
     let workers = 24usize;
@@ -970,7 +975,10 @@ fn anchored_open_high_contention_multi_write_preserves_complete_lines() {
 
     let content = fs::read_to_string(&sanitized.resolved_path)
         .expect("contention output file must be readable");
-    let lines: Vec<&str> = content.lines().filter(|line| !line.trim().is_empty()).collect();
+    let lines: Vec<&str> = content
+        .lines()
+        .filter(|line| !line.trim().is_empty())
+        .collect();
     assert_eq!(
         lines.len(),
         workers * rounds,
@@ -1014,8 +1022,7 @@ fn append_unknown_dc_line_returns_error_for_read_only_descriptor() {
         "target/telemt-unknown-dc-append-ro-{}/unknown-dc.log",
         std::process::id()
     );
-    let sanitized =
-        sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
+    let sanitized = sanitize_unknown_dc_log_path(&rel_candidate).expect("candidate must sanitize");
     fs::write(&sanitized.resolved_path, "seed\n").expect("seed file must be writable");
 
     let mut readonly = std::fs::OpenOptions::new()

src/proxy/tests/handshake_advanced_clever_tests.rs

@@ -1,5 +1,5 @@
 use super::*;
-use crate::crypto::{sha256, sha256_hmac, AesCtr};
+use crate::crypto::{AesCtr, sha256, sha256_hmac};
 use crate::protocol::constants::{ProtoTag, RESERVED_NONCE_BEGINNINGS, RESERVED_NONCE_FIRST_BYTES};
 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
 use std::sync::Arc;
@@ -175,7 +175,10 @@ async fn tls_minimum_viable_length_boundary() {
         None,
     )
     .await;
-    assert!(matches!(res, HandshakeResult::Success(_)), "Exact minimum length TLS handshake must succeed");
+    assert!(
+        matches!(res, HandshakeResult::Success(_)),
+        "Exact minimum length TLS handshake must succeed"
+    );
 
     let short_handshake = vec![0x42u8; min_len - 1];
     let res_short = handle_tls_handshake(
@@ -189,7 +192,10 @@ async fn tls_minimum_viable_length_boundary() {
         None,
     )
     .await;
-    assert!(matches!(res_short, HandshakeResult::BadClient { .. }), "Handshake 1 byte shorter than minimum must fail closed");
+    assert!(
+        matches!(res_short, HandshakeResult::BadClient { .. }),
+        "Handshake 1 byte shorter than minimum must fail closed"
+    );
 }
 
 #[tokio::test]
@@ -219,9 +225,16 @@ async fn mtproto_extreme_dc_index_serialization() {
 
         match res {
             HandshakeResult::Success((_, _, success)) => {
-                assert_eq!(success.dc_idx, extreme_dc, "Extreme DC index {} must serialize/deserialize perfectly", extreme_dc);
+                assert_eq!(
+                    success.dc_idx, extreme_dc,
+                    "Extreme DC index {} must serialize/deserialize perfectly",
+                    extreme_dc
+                );
             }
-            _ => panic!("MTProto handshake with extreme DC index {} failed", extreme_dc),
+            _ => panic!(
+                "MTProto handshake with extreme DC index {} failed",
+                extreme_dc
+            ),
         }
     }
 }
@@ -253,7 +266,11 @@ async fn alpn_strict_case_and_padding_rejection() {
             None,
         )
         .await;
-        assert!(matches!(res, HandshakeResult::BadClient { .. }), "ALPN strict enforcement must reject {:?}", bad_alpn);
+        assert!(
+            matches!(res, HandshakeResult::BadClient { .. }),
+            "ALPN strict enforcement must reject {:?}",
+            bad_alpn
+        );
     }
 }
 
@@ -265,8 +282,15 @@ fn ipv4_mapped_ipv6_bucketing_anomaly() {
     let norm_1 = normalize_auth_probe_ip(ipv4_mapped_1);
     let norm_2 = normalize_auth_probe_ip(ipv4_mapped_2);
 
-    assert_eq!(norm_1, norm_2, "IPv4-mapped IPv6 addresses must collapse into the same /64 bucket (::0)");
-    assert_eq!(norm_1, IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0)), "The bucket must be exactly ::0");
+    assert_eq!(
+        norm_1, norm_2,
+        "IPv4-mapped IPv6 addresses must collapse into the same /64 bucket (::0)"
+    );
+    assert_eq!(
+        norm_1,
+        IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0)),
+        "The bucket must be exactly ::0"
+    );
 }
 
 // --- Category 2: Adversarial & Black Hat ---
@@ -309,7 +333,10 @@ async fn mtproto_invalid_ciphertext_does_not_poison_replay_cache() {
         None,
     )
     .await;
-    assert!(matches!(res_valid, HandshakeResult::Success(_)), "Invalid MTProto ciphertext must not poison the replay cache");
+    assert!(
+        matches!(res_valid, HandshakeResult::Success(_)),
+        "Invalid MTProto ciphertext must not poison the replay cache"
+    );
 }
 
 #[tokio::test]
@@ -352,7 +379,10 @@ async fn tls_invalid_session_does_not_poison_replay_cache() {
         None,
     )
     .await;
-    assert!(matches!(res_valid, HandshakeResult::Success(_)), "Invalid TLS payload must not poison the replay cache");
+    assert!(
+        matches!(res_valid, HandshakeResult::Success(_)),
+        "Invalid TLS payload must not poison the replay cache"
+    );
 }
 
 #[tokio::test]
@@ -387,7 +417,10 @@ async fn server_hello_delay_timing_neutrality_on_hmac_failure() {
     let elapsed = start.elapsed();
 
     assert!(matches!(res, HandshakeResult::BadClient { .. }));
-    assert!(elapsed >= Duration::from_millis(45), "Invalid HMAC must still incur the configured ServerHello delay to prevent timing side-channels");
+    assert!(
+        elapsed >= Duration::from_millis(45),
+        "Invalid HMAC must still incur the configured ServerHello delay to prevent timing side-channels"
+    );
 }
 
 #[tokio::test]
@@ -421,7 +454,10 @@ async fn server_hello_delay_inversion_resilience() {
     let elapsed = start.elapsed();
 
     assert!(matches!(res, HandshakeResult::Success(_)));
-    assert!(elapsed >= Duration::from_millis(90), "Delay logic must gracefully handle min > max inversions via max.max(min)");
+    assert!(
+        elapsed >= Duration::from_millis(90),
+        "Delay logic must gracefully handle min > max inversions via max.max(min)"
+    );
 }
 
 #[tokio::test]
@@ -436,10 +472,16 @@ async fn mixed_valid_and_invalid_user_secrets_configuration() {
 
     for i in 0..9 {
         let bad_secret = if i % 2 == 0 { "badhex!" } else { "1122" };
-        config.access.users.insert(format!("bad_user_{}", i), bad_secret.to_string());
+        config
+            .access
+            .users
+            .insert(format!("bad_user_{}", i), bad_secret.to_string());
     }
     let valid_secret_hex = "99999999999999999999999999999999";
-    config.access.users.insert("good_user".to_string(), valid_secret_hex.to_string());
+    config
+        .access
+        .users
+        .insert("good_user".to_string(), valid_secret_hex.to_string());
     config.general.modes.secure = true;
     config.general.modes.classic = true;
     config.general.modes.tls = true;
@@ -463,7 +505,10 @@ async fn mixed_valid_and_invalid_user_secrets_configuration() {
     )
     .await;
 
-    assert!(matches!(res, HandshakeResult::Success(_)), "Proxy must gracefully skip invalid secrets and authenticate the valid one");
+    assert!(
+        matches!(res, HandshakeResult::Success(_)),
+        "Proxy must gracefully skip invalid secrets and authenticate the valid one"
+    );
 }
 
 #[tokio::test]
@@ -494,7 +539,10 @@ async fn tls_emulation_fallback_when_cache_missing() {
     )
     .await;
 
-    assert!(matches!(res, HandshakeResult::Success(_)), "TLS emulation must gracefully fall back to standard ServerHello if cache is missing");
+    assert!(
+        matches!(res, HandshakeResult::Success(_)),
+        "TLS emulation must gracefully fall back to standard ServerHello if cache is missing"
+    );
 }
 
 #[tokio::test]
@@ -524,7 +572,10 @@ async fn classic_mode_over_tls_transport_protocol_confusion() {
     )
     .await;
 
-    assert!(matches!(res, HandshakeResult::Success(_)), "Intermediate tag over TLS must succeed if classic mode is enabled, locking in cross-transport behavior");
+    assert!(
+        matches!(res, HandshakeResult::Success(_)),
+        "Intermediate tag over TLS must succeed if classic mode is enabled, locking in cross-transport behavior"
+    );
 }
 
 #[test]
@@ -543,9 +594,15 @@ fn generate_tg_nonce_never_emits_reserved_bytes() {
             false,
         );
 
-        assert!(!RESERVED_NONCE_FIRST_BYTES.contains(&nonce[0]), "Nonce must never start with reserved bytes");
+        assert!(
+            !RESERVED_NONCE_FIRST_BYTES.contains(&nonce[0]),
+            "Nonce must never start with reserved bytes"
+        );
         let first_four: [u8; 4] = [nonce[0], nonce[1], nonce[2], nonce[3]];
-        assert!(!RESERVED_NONCE_BEGINNINGS.contains(&first_four), "Nonce must never match reserved 4-byte beginnings");
+        assert!(
+            !RESERVED_NONCE_BEGINNINGS.contains(&first_four),
+            "Nonce must never match reserved 4-byte beginnings"
+        );
     }
 }
 
@@ -568,11 +625,18 @@ async fn dashmap_concurrent_saturation_stress() {
     }
 
     for task in tasks {
-        task.await.expect("Task panicked during concurrent DashMap stress");
+        task.await
+            .expect("Task panicked during concurrent DashMap stress");
     }
 
-    assert!(auth_probe_is_throttled_for_testing(ip_a), "IP A must be throttled after concurrent stress");
-    assert!(auth_probe_is_throttled_for_testing(ip_b), "IP B must be throttled after concurrent stress");
+    assert!(
+        auth_probe_is_throttled_for_testing(ip_a),
+        "IP A must be throttled after concurrent stress"
+    );
+    assert!(
+        auth_probe_is_throttled_for_testing(ip_b),
+        "IP B must be throttled after concurrent stress"
+    );
 }
 
 #[test]
@@ -586,7 +650,12 @@ fn prototag_invalid_bytes_fail_closed() {
     ];
 
     for tag in invalid_tags {
-        assert_eq!(ProtoTag::from_bytes(tag), None, "Invalid ProtoTag bytes {:?} must fail closed", tag);
+        assert_eq!(
+            ProtoTag::from_bytes(tag),
+            None,
+            "Invalid ProtoTag bytes {:?} must fail closed",
+            tag
+        );
     }
 }
 
@@ -603,7 +672,10 @@ fn auth_probe_eviction_hash_collision_stress() {
         auth_probe_record_failure_with_state(state, ip, now);
     }
 
-    assert!(state.len() <= AUTH_PROBE_TRACK_MAX_ENTRIES, "Eviction logic must successfully bound the map size under heavy insertion stress");
+    assert!(
+        state.len() <= AUTH_PROBE_TRACK_MAX_ENTRIES,
+        "Eviction logic must successfully bound the map size under heavy insertion stress"
+    );
 }
 
 #[test]

src/proxy/tests/handshake_auth_probe_eviction_bias_security_tests.rs

@@ -88,6 +88,9 @@ fn light_fuzz_offset_always_stays_inside_state_len() {
         let now = base + Duration::from_nanos(seed & 0x0fff);
         let start = auth_probe_scan_start_offset(ip, now, state_len, scan_limit);
 
-        assert!(start < state_len, "scan offset must stay inside state length");
+        assert!(
+            start < state_len,
+            "scan offset must stay inside state length"
+        );
     }
-}
+}

src/proxy/tests/handshake_auth_probe_scan_budget_security_tests.rs

@@ -96,4 +96,4 @@ fn light_fuzz_scan_offset_budget_never_exceeds_effective_window() {
             "scan offset must stay inside state length"
         );
     }
-}
+}

src/proxy/tests/handshake_auth_probe_scan_offset_stress_tests.rs

@@ -113,4 +113,4 @@ fn light_fuzz_scan_offset_stays_within_window_for_randomized_inputs() {
             "scan offset must always remain inside state length"
         );
     }
-}
+}

src/proxy/tests/handshake_more_clever_tests.rs

@@ -1,8 +1,8 @@
 use super::*;
-use crate::crypto::{sha256, sha256_hmac, AesCtr};
+use crate::crypto::{AesCtr, sha256, sha256_hmac};
 use crate::protocol::constants::{ProtoTag, RESERVED_NONCE_BEGINNINGS, RESERVED_NONCE_FIRST_BYTES};
-use rand::{Rng, SeedableRng};
 use rand::rngs::StdRng;
+use rand::{Rng, SeedableRng};
 use std::collections::HashSet;
 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
 use std::sync::Arc;
@@ -223,7 +223,10 @@ fn auth_probe_backoff_extreme_fail_streak_clamps_safely() {
     assert_eq!(updated.fail_streak, u32::MAX);
 
     let expected_blocked_until = now + Duration::from_millis(AUTH_PROBE_BACKOFF_MAX_MS);
-    assert_eq!(updated.blocked_until, expected_blocked_until, "Extreme fail streak must clamp cleanly to AUTH_PROBE_BACKOFF_MAX_MS");
+    assert_eq!(
+        updated.blocked_until, expected_blocked_until,
+        "Extreme fail streak must clamp cleanly to AUTH_PROBE_BACKOFF_MAX_MS"
+    );
 }
 
 #[test]
@@ -250,12 +253,19 @@ fn generate_tg_nonce_cryptographic_uniqueness_and_entropy() {
             total_set_bits += byte.count_ones() as usize;
         }
 
-        assert!(nonces.insert(nonce), "generate_tg_nonce emitted a duplicate nonce! RNG is stuck.");
+        assert!(
+            nonces.insert(nonce),
+            "generate_tg_nonce emitted a duplicate nonce! RNG is stuck."
+        );
     }
 
     let total_bits = iterations * HANDSHAKE_LEN * 8;
     let ratio = (total_set_bits as f64) / (total_bits as f64);
-    assert!(ratio > 0.48 && ratio < 0.52, "Nonce entropy is degraded. Set bit ratio: {}", ratio);
+    assert!(
+        ratio > 0.48 && ratio < 0.52,
+        "Nonce entropy is degraded. Set bit ratio: {}",
+        ratio
+    );
 }
 
 #[tokio::test]
@@ -267,10 +277,19 @@ async fn mtproto_multi_user_decryption_isolation() {
     config.general.modes.secure = true;
     config.access.ignore_time_skew = true;
 
-    config.access.users.insert("user_a".to_string(), "11111111111111111111111111111111".to_string());
-    config.access.users.insert("user_b".to_string(), "22222222222222222222222222222222".to_string());
+    config.access.users.insert(
+        "user_a".to_string(),
+        "11111111111111111111111111111111".to_string(),
+    );
+    config.access.users.insert(
+        "user_b".to_string(),
+        "22222222222222222222222222222222".to_string(),
+    );
     let good_secret_hex = "33333333333333333333333333333333";
-    config.access.users.insert("user_c".to_string(), good_secret_hex.to_string());
+    config
+        .access
+        .users
+        .insert("user_c".to_string(), good_secret_hex.to_string());
 
     let replay_checker = ReplayChecker::new(128, Duration::from_secs(60));
     let peer: SocketAddr = "192.0.2.104:12345".parse().unwrap();
@@ -291,9 +310,14 @@ async fn mtproto_multi_user_decryption_isolation() {
 
     match res {
         HandshakeResult::Success((_, _, success)) => {
-            assert_eq!(success.user, "user_c", "Decryption attempts on previous users must not corrupt the handshake buffer for the valid user");
+            assert_eq!(
+                success.user, "user_c",
+                "Decryption attempts on previous users must not corrupt the handshake buffer for the valid user"
+            );
         }
-        _ => panic!("Multi-user MTProto handshake failed. Decryption buffer might be mutating in place."),
+        _ => panic!(
+            "Multi-user MTProto handshake failed. Decryption buffer might be mutating in place."
+        ),
     }
 }
 
@@ -325,7 +349,9 @@ async fn invalid_secret_warning_lock_contention_and_bound() {
     }
 
     let warned = INVALID_SECRET_WARNED.get().unwrap();
-    let guard = warned.lock().unwrap_or_else(|poisoned| poisoned.into_inner());
+    let guard = warned
+        .lock()
+        .unwrap_or_else(|poisoned| poisoned.into_inner());
 
     assert_eq!(
         guard.len(),
@@ -342,7 +368,11 @@ async fn mtproto_strict_concurrent_replay_race_condition() {
     let secret_hex = "4A4A4A4A4A4A4A4A4A4A4A4A4A4A4A4A";
     let config = Arc::new(test_config_with_secret_hex(secret_hex));
     let replay_checker = Arc::new(ReplayChecker::new(4096, Duration::from_secs(60)));
-    let valid_handshake = Arc::new(make_valid_mtproto_handshake(secret_hex, ProtoTag::Secure, 1));
+    let valid_handshake = Arc::new(make_valid_mtproto_handshake(
+        secret_hex,
+        ProtoTag::Secure,
+        1,
+    ));
 
     let tasks = 100;
     let barrier = Arc::new(Barrier::new(tasks));
@@ -355,7 +385,10 @@ async fn mtproto_strict_concurrent_replay_race_condition() {
         let hs = valid_handshake.clone();
 
         handles.push(tokio::spawn(async move {
-            let peer = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(10, 0, 0, (i % 250) as u8)), 10000 + i as u16);
+            let peer = SocketAddr::new(
+                IpAddr::V4(Ipv4Addr::new(10, 0, 0, (i % 250) as u8)),
+                10000 + i as u16,
+            );
             b.wait().await;
             handle_mtproto_handshake(
                 &hs,
@@ -382,8 +415,15 @@ async fn mtproto_strict_concurrent_replay_race_condition() {
         }
     }
 
-    assert_eq!(successes, 1, "Replay cache race condition allowed multiple identical MTProto handshakes to succeed");
-    assert_eq!(failures, tasks - 1, "Replay cache failed to forcefully reject concurrent duplicates");
+    assert_eq!(
+        successes, 1,
+        "Replay cache race condition allowed multiple identical MTProto handshakes to succeed"
+    );
+    assert_eq!(
+        failures,
+        tasks - 1,
+        "Replay cache failed to forcefully reject concurrent duplicates"
+    );
 }
 
 #[tokio::test]
@@ -398,7 +438,8 @@ async fn tls_alpn_zero_length_protocol_handled_safely() {
     let rng = SecureRandom::new();
     let peer: SocketAddr = "192.0.2.107:12345".parse().unwrap();
 
-    let handshake = make_valid_tls_client_hello_with_sni_and_alpn(&secret, 0, "example.com", &[b""]);
+    let handshake =
+        make_valid_tls_client_hello_with_sni_and_alpn(&secret, 0, "example.com", &[b""]);
 
     let res = handle_tls_handshake(
         &handshake,
@@ -412,7 +453,10 @@ async fn tls_alpn_zero_length_protocol_handled_safely() {
     )
     .await;
 
-    assert!(matches!(res, HandshakeResult::BadClient { .. }), "0-length ALPN must be safely rejected without panicking");
+    assert!(
+        matches!(res, HandshakeResult::BadClient { .. }),
+        "0-length ALPN must be safely rejected without panicking"
+    );
 }
 
 #[tokio::test]
@@ -427,7 +471,8 @@ async fn tls_sni_massive_hostname_does_not_panic() {
     let peer: SocketAddr = "192.0.2.108:12345".parse().unwrap();
 
     let massive_hostname = String::from_utf8(vec![b'a'; 65000]).unwrap();
-    let handshake = make_valid_tls_client_hello_with_sni_and_alpn(&secret, 0, &massive_hostname, &[]);
+    let handshake =
+        make_valid_tls_client_hello_with_sni_and_alpn(&secret, 0, &massive_hostname, &[]);
 
     let res = handle_tls_handshake(
         &handshake,
@@ -441,7 +486,13 @@ async fn tls_sni_massive_hostname_does_not_panic() {
     )
     .await;
 
-    assert!(matches!(res, HandshakeResult::Success(_) | HandshakeResult::BadClient { .. }), "Massive SNI hostname must be processed or ignored without stack overflow or panic");
+    assert!(
+        matches!(
+            res,
+            HandshakeResult::Success(_) | HandshakeResult::BadClient { .. }
+        ),
+        "Massive SNI hostname must be processed or ignored without stack overflow or panic"
+    );
 }
 
 #[tokio::test]
@@ -455,7 +506,8 @@ async fn tls_progressive_truncation_fuzzing_no_panics() {
     let rng = SecureRandom::new();
     let peer: SocketAddr = "192.0.2.109:12345".parse().unwrap();
 
-    let valid_handshake = make_valid_tls_client_hello_with_sni_and_alpn(&secret, 0, "example.com", &[b"h2"]);
+    let valid_handshake =
+        make_valid_tls_client_hello_with_sni_and_alpn(&secret, 0, "example.com", &[b"h2"]);
     let full_len = valid_handshake.len();
 
     // Truncated corpus only: full_len is a valid baseline and should not be
@@ -473,7 +525,11 @@ async fn tls_progressive_truncation_fuzzing_no_panics() {
             None,
         )
         .await;
-        assert!(matches!(res, HandshakeResult::BadClient { .. }), "Truncated TLS handshake at len {} must fail safely without panicking", i);
+        assert!(
+            matches!(res, HandshakeResult::BadClient { .. }),
+            "Truncated TLS handshake at len {} must fail safely without panicking",
+            i
+        );
     }
 }
 
@@ -504,7 +560,10 @@ async fn mtproto_pure_entropy_fuzzing_no_panics() {
         )
         .await;
 
-        assert!(matches!(res, HandshakeResult::BadClient { .. }), "Pure entropy MTProto payload must fail closed and never panic");
+        assert!(
+            matches!(res, HandshakeResult::BadClient { .. }),
+            "Pure entropy MTProto payload must fail closed and never panic"
+        );
     }
 }
 
@@ -517,10 +576,16 @@ fn decode_user_secret_odd_length_hex_rejection() {
 
     let mut config = ProxyConfig::default();
     config.access.users.clear();
-    config.access.users.insert("odd_user".to_string(), "1234567890123456789012345678901".to_string());
+    config.access.users.insert(
+        "odd_user".to_string(),
+        "1234567890123456789012345678901".to_string(),
+    );
 
     let decoded = decode_user_secrets(&config, None);
-    assert!(decoded.is_empty(), "Odd-length hex string must be gracefully rejected by hex::decode without unwrapping");
+    assert!(
+        decoded.is_empty(),
+        "Odd-length hex string must be gracefully rejected by hex::decode without unwrapping"
+    );
 }
 
 #[test]
@@ -552,7 +617,10 @@ fn saturation_grace_pre_existing_high_fail_streak_immediate_throttle() {
     }
 
     let is_throttled = auth_probe_should_apply_preauth_throttle(peer_ip, now);
-    assert!(is_throttled, "A peer with a pre-existing high fail streak must be immediately throttled when saturation begins, receiving no unearned grace period");
+    assert!(
+        is_throttled,
+        "A peer with a pre-existing high fail streak must be immediately throttled when saturation begins, receiving no unearned grace period"
+    );
 }
 
 #[test]
@@ -586,7 +654,11 @@ fn mtproto_classic_tags_rejected_when_only_secure_mode_enabled() {
     config.general.modes.tls = false;
 
     assert!(!mode_enabled_for_proto(&config, ProtoTag::Abridged, false));
-    assert!(!mode_enabled_for_proto(&config, ProtoTag::Intermediate, false));
+    assert!(!mode_enabled_for_proto(
+        &config,
+        ProtoTag::Intermediate,
+        false
+    ));
 }
 
 #[test]

src/proxy/tests/handshake_real_bug_stress_tests.rs

@@ -1,5 +1,5 @@
 use super::*;
-use crate::crypto::{sha256, sha256_hmac, AesCtr, SecureRandom};
+use crate::crypto::{AesCtr, SecureRandom, sha256, sha256_hmac};
 use crate::protocol::constants::{ProtoTag, TLS_RECORD_HANDSHAKE, TLS_VERSION};
 use std::net::{IpAddr, Ipv4Addr, SocketAddr};
 use std::sync::Arc;
@@ -80,8 +80,7 @@ fn make_valid_tls_client_hello_with_alpn(
         digest[28 + i] ^= ts[i];
     }
 
-    record[tls::TLS_DIGEST_POS..tls::TLS_DIGEST_POS + tls::TLS_DIGEST_LEN]
-        .copy_from_slice(&digest);
+    record[tls::TLS_DIGEST_POS..tls::TLS_DIGEST_POS + tls::TLS_DIGEST_LEN].copy_from_slice(&digest);
 
     record
 }
@@ -331,7 +330,11 @@ async fn saturation_grace_exhaustion_under_concurrency_keeps_peer_throttled() {
 
     let final_state = state.get(&peer_ip).expect("state must exist");
     assert!(
-        final_state.fail_streak >= AUTH_PROBE_BACKOFF_START_FAILS + AUTH_PROBE_SATURATION_GRACE_FAILS
+        final_state.fail_streak
+            >= AUTH_PROBE_BACKOFF_START_FAILS + AUTH_PROBE_SATURATION_GRACE_FAILS
     );
-    assert!(auth_probe_should_apply_preauth_throttle(peer_ip, Instant::now()));
+    assert!(auth_probe_should_apply_preauth_throttle(
+        peer_ip,
+        Instant::now()
+    ));
 }

src/proxy/tests/handshake_security_tests.rs

@@ -956,6 +956,89 @@ async fn stress_tls_sni_preferred_user_hint_scales_to_large_user_set() {
     }
 }
 
+#[tokio::test]
+async fn tls_unknown_sni_drop_policy_returns_hard_error() {
+    let secret = [0x48u8; 16];
+    let mut config = test_config_with_secret_hex("48484848484848484848484848484848");
+    config.censorship.unknown_sni_action = UnknownSniAction::Drop;
+
+    let replay_checker = ReplayChecker::new(128, Duration::from_secs(60));
+    let rng = SecureRandom::new();
+    let peer: SocketAddr = "198.51.100.190:44326".parse().unwrap();
+    let handshake =
+        make_valid_tls_client_hello_with_sni_and_alpn(&secret, 0, "unknown.example", &[b"h2"]);
+
+    let result = handle_tls_handshake(
+        &handshake,
+        tokio::io::empty(),
+        tokio::io::sink(),
+        peer,
+        &config,
+        &replay_checker,
+        &rng,
+        None,
+    )
+    .await;
+
+    assert!(matches!(
+        result,
+        HandshakeResult::Error(ProxyError::UnknownTlsSni)
+    ));
+}
+
+#[tokio::test]
+async fn tls_unknown_sni_mask_policy_falls_back_to_bad_client() {
+    let secret = [0x49u8; 16];
+    let mut config = test_config_with_secret_hex("49494949494949494949494949494949");
+    config.censorship.unknown_sni_action = UnknownSniAction::Mask;
+
+    let replay_checker = ReplayChecker::new(128, Duration::from_secs(60));
+    let rng = SecureRandom::new();
+    let peer: SocketAddr = "198.51.100.191:44326".parse().unwrap();
+    let handshake =
+        make_valid_tls_client_hello_with_sni_and_alpn(&secret, 0, "unknown.example", &[b"h2"]);
+
+    let result = handle_tls_handshake(
+        &handshake,
+        tokio::io::empty(),
+        tokio::io::sink(),
+        peer,
+        &config,
+        &replay_checker,
+        &rng,
+        None,
+    )
+    .await;
+
+    assert!(matches!(result, HandshakeResult::BadClient { .. }));
+}
+
+#[tokio::test]
+async fn tls_missing_sni_keeps_legacy_auth_path() {
+    let secret = [0x4Au8; 16];
+    let mut config = test_config_with_secret_hex("4a4a4a4a4a4a4a4a4a4a4a4a4a4a4a4a");
+    config.censorship.unknown_sni_action = UnknownSniAction::Drop;
+
+    let replay_checker = ReplayChecker::new(128, Duration::from_secs(60));
+    let rng = SecureRandom::new();
+    let peer: SocketAddr = "198.51.100.192:44326".parse().unwrap();
+    let handshake = make_valid_tls_handshake(&secret, 0);
+
+    let result = handle_tls_handshake(
+        &handshake,
+        tokio::io::empty(),
+        tokio::io::sink(),
+        peer,
+        &config,
+        &replay_checker,
+        &rng,
+        None,
+    )
+    .await;
+
+    assert!(matches!(result, HandshakeResult::Success(_)));
+}
+
 #[tokio::test]
 async fn alpn_enforce_rejects_unsupported_client_alpn() {
     let secret = [0x33u8; 16];

src/proxy/tests/handshake_timing_manual_bench_tests.rs

@@ -1,5 +1,5 @@
 use super::*;
-use crate::crypto::{sha256, sha256_hmac, AesCtr, SecureRandom};
+use crate::crypto::{AesCtr, SecureRandom, sha256, sha256_hmac};
 use crate::protocol::constants::{ProtoTag, TLS_RECORD_HANDSHAKE, TLS_VERSION};
 use std::net::SocketAddr;
 use std::time::{Duration, Instant};
@@ -169,10 +169,10 @@ async fn mtproto_user_scan_timing_manual_benchmark() {
         );
     }
 
-    config.access.users.insert(
-        preferred_user.to_string(),
-        target_secret_hex.to_string(),
-    );
+    config
+        .access
+        .users
+        .insert(preferred_user.to_string(), target_secret_hex.to_string());
 
     let replay_checker_preferred = ReplayChecker::new(65_536, Duration::from_secs(60));
     let replay_checker_full_scan = ReplayChecker::new(65_536, Duration::from_secs(60));

src/proxy/tests/masking_ab_envelope_blur_integration_security_tests.rs

@@ -544,7 +544,6 @@ async fn timing_classifier_light_fuzz_pairwise_bucketed_accuracy_stays_bounded_u
         if hardened_acc + 0.05 <= baseline_acc {
             meaningful_improvement_seen = true;
         }
-
     }
 
     assert!(

src/proxy/tests/masking_additional_hardening_security_tests.rs

@@ -78,7 +78,11 @@ fn timing_normalization_zero_floor_safety_net_defaults_to_mask_timeout() {
     config.censorship.mask_timing_normalization_ceiling_ms = 0;
 
     let budget = mask_outcome_target_budget(&config);
-    assert_eq!(budget, MASK_TIMEOUT);
+    assert_eq!(
+        budget,
+        Duration::from_millis(0),
+        "zero floor/ceiling must produce zero extra normalization budget"
+    );
 }
 
 #[tokio::test]

src/proxy/tests/masking_aggressive_mode_security_tests.rs

@@ -85,7 +85,10 @@ async fn aggressive_mode_shapes_backend_silent_non_eof_path() {
     let legacy = capture_forwarded_len_with_mode(body_sent, false, false, false, 0).await;
     let aggressive = capture_forwarded_len_with_mode(body_sent, false, true, false, 0).await;
 
-    assert!(legacy < floor, "legacy mode should keep timeout path unshaped");
+    assert!(
+        legacy < floor,
+        "legacy mode should keep timeout path unshaped"
+    );
     assert!(
         aggressive >= floor,
         "aggressive mode must shape backend-silent non-EOF paths (aggressive={aggressive}, floor={floor})"

src/proxy/tests/masking_connect_failure_close_matrix_security_tests.rs

@@ -52,7 +52,10 @@ async fn run_connect_failure_case(
         .await
         .unwrap()
         .unwrap();
-    assert_eq!(n, 0, "connect-failure path must close client-visible writer");
+    assert_eq!(
+        n, 0,
+        "connect-failure path must close client-visible writer"
+    );
 
     started.elapsed()
 }
@@ -67,13 +70,9 @@ async fn connect_failure_refusal_close_behavior_matrix() {
         let peer: SocketAddr = format!("203.0.113.210:{}", 54100 + idx as u16)
             .parse()
             .unwrap();
-        let elapsed = run_connect_failure_case(
-            "127.0.0.1",
-            unused_port,
-            timing_normalization_enabled,
-            peer,
-        )
-        .await;
+        let elapsed =
+            run_connect_failure_case("127.0.0.1", unused_port, timing_normalization_enabled, peer)
+                .await;
 
         if timing_normalization_enabled {
             assert!(

src/proxy/tests/masking_consume_idle_timeout_security_tests.rs

@@ -79,7 +79,10 @@ async fn io_error_terminates_cleanly() {
         }
     }
 
-    tokio::time::timeout(MASK_RELAY_TIMEOUT, consume_client_data(ErrReader, usize::MAX))
-        .await
-        .expect("consume_client_data did not return on I/O error");
+    tokio::time::timeout(
+        MASK_RELAY_TIMEOUT,
+        consume_client_data(ErrReader, usize::MAX),
+    )
+    .await
+    .expect("consume_client_data did not return on I/O error");
 }

src/proxy/tests/masking_extended_attack_surface_security_tests.rs

@@ -32,8 +32,16 @@ async fn run_self_target_refusal(
     let (mut client, server) = duplex(1024);
     let started = Instant::now();
     let task = tokio::spawn(async move {
-        handle_bad_client(server, tokio::io::sink(), initial, peer, local_addr, &config, &beobachten)
-            .await;
+        handle_bad_client(
+            server,
+            tokio::io::sink(),
+            initial,
+            peer,
+            local_addr,
+            &config,
+            &beobachten,
+        )
+        .await;
     });
 
     client
@@ -214,4 +222,4 @@ async fn stress_high_fanout_self_target_refusal_no_deadlock_or_timeout() {
     })
     .await
     .expect("high-fanout refusal workload must complete without deadlock");
-}
+}

src/proxy/tests/masking_http_probe_boundary_security_tests.rs

@@ -2,7 +2,13 @@ use super::*;
 
 #[test]
 fn exact_four_byte_http_tokens_are_classified() {
-    for token in [b"GET ".as_ref(), b"POST".as_ref(), b"HEAD".as_ref(), b"PUT ".as_ref(), b"PRI ".as_ref()] {
+    for token in [
+        b"GET ".as_ref(),
+        b"POST".as_ref(),
+        b"HEAD".as_ref(),
+        b"PUT ".as_ref(),
+        b"PRI ".as_ref(),
+    ] {
         assert!(
             is_http_probe(token),
             "exact 4-byte token must be classified as HTTP probe: {:?}",
@@ -76,4 +82,4 @@ fn light_fuzz_four_byte_ascii_noise_not_misclassified() {
             token
         );
     }
-}
+}

src/proxy/tests/masking_interface_cache_concurrency_security_tests.rs

@@ -38,4 +38,4 @@ async fn adversarial_parallel_cold_miss_performs_single_interface_refresh() {
         1,
         "parallel cold misses must coalesce into a single interface enumeration"
     );
-}
+}

src/proxy/tests/masking_interface_cache_security_tests.rs

@@ -37,7 +37,10 @@ async fn tdd_non_local_port_short_circuit_does_not_enumerate_interfaces() {
     let local_addr: SocketAddr = "0.0.0.0:443".parse().expect("valid local addr");
     let is_local = is_mask_target_local_listener_async("127.0.0.1", 8443, local_addr, None).await;
 
-    assert!(!is_local, "different port must not be treated as local listener");
+    assert!(
+        !is_local,
+        "different port must not be treated as local listener"
+    );
     assert_eq!(
         local_interface_enumerations_for_tests(),
         0,

src/proxy/tests/masking_production_cap_regression_security_tests.rs

@@ -63,17 +63,11 @@ impl AsyncWrite for CountingWriter {
         Poll::Ready(Ok(buf.len()))
     }
 
-    fn poll_flush(
-        self: Pin<&mut Self>,
-        _cx: &mut Context<'_>,
-    ) -> Poll<std::io::Result<()>> {
+    fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<std::io::Result<()>> {
         Poll::Ready(Ok(()))
     }
 
-    fn poll_shutdown(
-        self: Pin<&mut Self>,
-        _cx: &mut Context<'_>,
-    ) -> Poll<std::io::Result<()>> {
+    fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<std::io::Result<()>> {
         Poll::Ready(Ok(()))
     }
 }

src/proxy/tests/masking_self_target_loop_security_tests.rs

@@ -1,6 +1,6 @@
 use super::*;
-use std::net::TcpListener as StdTcpListener;
 use std::net::SocketAddr;
+use std::net::TcpListener as StdTcpListener;
 use tokio::io::{AsyncReadExt, AsyncWriteExt, duplex};
 use tokio::net::TcpListener;
 use tokio::time::{Duration, Instant, timeout};
@@ -15,74 +15,38 @@ fn closed_local_port() -> u16 {
 #[tokio::test]
 async fn self_target_detection_matches_literal_ipv4_listener() {
     let local: SocketAddr = "198.51.100.40:443".parse().unwrap();
-    assert!(is_mask_target_local_listener_async(
-        "198.51.100.40",
-        443,
-        local,
-        None,
-    )
-    .await);
+    assert!(is_mask_target_local_listener_async("198.51.100.40", 443, local, None,).await);
 }
 
 #[tokio::test]
 async fn self_target_detection_matches_bracketed_ipv6_listener() {
     let local: SocketAddr = "[2001:db8::44]:8443".parse().unwrap();
-    assert!(is_mask_target_local_listener_async(
-        "[2001:db8::44]",
-        8443,
-        local,
-        None,
-    )
-    .await);
+    assert!(is_mask_target_local_listener_async("[2001:db8::44]", 8443, local, None,).await);
 }
 
 #[tokio::test]
 async fn self_target_detection_keeps_same_ip_different_port_forwardable() {
     let local: SocketAddr = "203.0.113.44:443".parse().unwrap();
-    assert!(!is_mask_target_local_listener_async(
-        "203.0.113.44",
-        8443,
-        local,
-        None,
-    )
-    .await);
+    assert!(!is_mask_target_local_listener_async("203.0.113.44", 8443, local, None,).await);
 }
 
 #[tokio::test]
 async fn self_target_detection_normalizes_ipv4_mapped_ipv6_literal() {
     let local: SocketAddr = "127.0.0.1:443".parse().unwrap();
-    assert!(is_mask_target_local_listener_async(
-        "::ffff:127.0.0.1",
-        443,
-        local,
-        None,
-    )
-    .await);
+    assert!(is_mask_target_local_listener_async("::ffff:127.0.0.1", 443, local, None,).await);
 }
 
 #[tokio::test]
 async fn self_target_detection_unspecified_bind_blocks_loopback_target() {
     let local: SocketAddr = "0.0.0.0:443".parse().unwrap();
-    assert!(is_mask_target_local_listener_async(
-        "127.0.0.1",
-        443,
-        local,
-        None,
-    )
-    .await);
+    assert!(is_mask_target_local_listener_async("127.0.0.1", 443, local, None,).await);
 }
 
 #[tokio::test]
 async fn self_target_detection_unspecified_bind_keeps_remote_target_forwardable() {
     let local: SocketAddr = "0.0.0.0:443".parse().unwrap();
     let remote: SocketAddr = "198.51.100.44:443".parse().unwrap();
-    assert!(!is_mask_target_local_listener_async(
-        "mask.example",
-        443,
-        local,
-        Some(remote),
-    )
-    .await);
+    assert!(!is_mask_target_local_listener_async("mask.example", 443, local, Some(remote),).await);
 }
 
 #[tokio::test]
@@ -306,7 +270,10 @@ async fn offline_mask_target_refusal_respects_timing_normalization_budget() {
     });
 
     client.shutdown().await.unwrap();
-    timeout(Duration::from_secs(2), task).await.unwrap().unwrap();
+    timeout(Duration::from_secs(2), task)
+        .await
+        .unwrap()
+        .unwrap();
     let elapsed = started.elapsed();
 
     assert!(
@@ -350,7 +317,10 @@ async fn offline_mask_target_refusal_with_idle_client_is_bounded_by_consume_time
         .await
         .expect("connection should still be open before consume timeout expires");
 
-    timeout(Duration::from_secs(2), task).await.unwrap().unwrap();
+    timeout(Duration::from_secs(2), task)
+        .await
+        .unwrap()
+        .unwrap();
     let elapsed = started.elapsed();
 
     assert!(

src/proxy/tests/masking_timing_budget_coupling_security_tests.rs

@@ -40,7 +40,10 @@ async fn adversarial_delayed_interface_lookup_does_not_consume_outcome_floor_bud
 
     tokio::time::sleep(Duration::from_millis(80)).await;
     drop(held_refresh_guard);
-    client.shutdown().await.expect("client shutdown must succeed");
+    client
+        .shutdown()
+        .await
+        .expect("client shutdown must succeed");
 
     timeout(Duration::from_secs(2), task)
         .await
@@ -52,4 +55,4 @@ async fn adversarial_delayed_interface_lookup_does_not_consume_outcome_floor_bud
         elapsed >= Duration::from_millis(180) && elapsed < Duration::from_millis(350),
         "timing normalization floor must start after pre-outcome self-target checks"
     );
-}
+}

src/proxy/tests/middle_relay_atomic_quota_invariant_tests.rs

@@ -0,0 +1,189 @@
+use super::*;
+use crate::crypto::AesCtr;
+use bytes::Bytes;
+use std::io;
+use std::pin::Pin;
+use std::sync::Arc;
+use std::sync::atomic::{AtomicU64, AtomicUsize, Ordering};
+use std::task::{Context, Poll};
+use tokio::io::AsyncWrite;
+
+struct CountedWriter {
+    write_calls: Arc<AtomicUsize>,
+    fail_writes: bool,
+}
+
+impl CountedWriter {
+    fn new(write_calls: Arc<AtomicUsize>, fail_writes: bool) -> Self {
+        Self {
+            write_calls,
+            fail_writes,
+        }
+    }
+}
+
+impl AsyncWrite for CountedWriter {
+    fn poll_write(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+        buf: &[u8],
+    ) -> Poll<io::Result<usize>> {
+        let this = self.get_mut();
+        this.write_calls.fetch_add(1, Ordering::Relaxed);
+        if this.fail_writes {
+            Poll::Ready(Err(io::Error::new(
+                io::ErrorKind::BrokenPipe,
+                "forced write failure",
+            )))
+        } else {
+            Poll::Ready(Ok(buf.len()))
+        }
+    }
+
+    fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Poll::Ready(Ok(()))
+    }
+
+    fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Poll::Ready(Ok(()))
+    }
+}
+
+fn make_crypto_writer(inner: CountedWriter) -> CryptoWriter<CountedWriter> {
+    let key = [0u8; 32];
+    let iv = 0u128;
+    CryptoWriter::new(inner, AesCtr::new(&key, iv), 8 * 1024)
+}
+
+#[tokio::test]
+async fn me_writer_write_fail_keeps_reserved_quota_and_tracks_fail_metrics() {
+    let stats = Stats::new();
+    let user = "middle-me-writer-no-rollback-user";
+    let user_stats = stats.get_or_create_user_stats_handle(user);
+    let write_calls = Arc::new(AtomicUsize::new(0));
+    let mut writer = make_crypto_writer(CountedWriter::new(write_calls.clone(), true));
+    let mut frame_buf = Vec::new();
+    let bytes_me2c = AtomicU64::new(0);
+    let payload = Bytes::from_static(&[0x11, 0x22, 0x33, 0x44, 0x55]);
+
+    let result = process_me_writer_response(
+        MeResponse::Data {
+            flags: 0,
+            data: payload.clone(),
+        },
+        &mut writer,
+        ProtoTag::Intermediate,
+        &SecureRandom::new(),
+        &mut frame_buf,
+        &stats,
+        user,
+        Some(user_stats.as_ref()),
+        Some(64),
+        0,
+        &bytes_me2c,
+        11,
+        true,
+        false,
+    )
+    .await;
+
+    assert!(
+        matches!(result, Err(ProxyError::Io(_))),
+        "write failure must propagate as I/O error"
+    );
+    assert!(
+        write_calls.load(Ordering::Relaxed) > 0,
+        "writer must be attempted after successful quota reservation"
+    );
+    assert_eq!(
+        stats.get_user_quota_used(user),
+        payload.len() as u64,
+        "reserved quota must not roll back on write failure"
+    );
+    assert_eq!(
+        stats.get_quota_write_fail_bytes_total(),
+        payload.len() as u64,
+        "write-fail byte metric must include failed payload size"
+    );
+    assert_eq!(
+        stats.get_quota_write_fail_events_total(),
+        1,
+        "write-fail events metric must increment once"
+    );
+    assert_eq!(
+        stats.get_user_total_octets(user),
+        0,
+        "telemetry octets_to should not advance when write fails"
+    );
+    assert_eq!(
+        bytes_me2c.load(Ordering::Relaxed),
+        0,
+        "ME->C committed byte counter must not advance on write failure"
+    );
+}
+
+#[tokio::test]
+async fn me_writer_pre_write_quota_reject_happens_before_writer_poll() {
+    let stats = Stats::new();
+    let user = "middle-me-writer-precheck-user";
+    let limit = 8u64;
+    let user_stats = stats.get_or_create_user_stats_handle(user);
+    stats.quota_charge_post_write(user_stats.as_ref(), limit);
+
+    let write_calls = Arc::new(AtomicUsize::new(0));
+    let mut writer = make_crypto_writer(CountedWriter::new(write_calls.clone(), false));
+    let mut frame_buf = Vec::new();
+    let bytes_me2c = AtomicU64::new(0);
+
+    let result = process_me_writer_response(
+        MeResponse::Data {
+            flags: 0,
+            data: Bytes::from_static(&[0xAA, 0xBB, 0xCC]),
+        },
+        &mut writer,
+        ProtoTag::Intermediate,
+        &SecureRandom::new(),
+        &mut frame_buf,
+        &stats,
+        user,
+        Some(user_stats.as_ref()),
+        Some(limit),
+        0,
+        &bytes_me2c,
+        12,
+        true,
+        false,
+    )
+    .await;
+
+    assert!(
+        matches!(result, Err(ProxyError::DataQuotaExceeded { .. })),
+        "pre-write quota rejection must return typed quota error"
+    );
+    assert_eq!(
+        write_calls.load(Ordering::Relaxed),
+        0,
+        "writer must not be polled when pre-write quota reservation fails"
+    );
+    assert_eq!(
+        stats.get_me_d2c_quota_reject_pre_write_total(),
+        1,
+        "pre-write quota reject metric must increment"
+    );
+    assert_eq!(
+        stats.get_user_quota_used(user),
+        limit,
+        "failed pre-write reservation must keep previous quota usage unchanged"
+    );
+    assert_eq!(
+        stats.get_quota_write_fail_bytes_total(),
+        0,
+        "write-fail bytes metric must stay unchanged on pre-write reject"
+    );
+    assert_eq!(
+        stats.get_quota_write_fail_events_total(),
+        0,
+        "write-fail events metric must stay unchanged on pre-write reject"
+    );
+    assert_eq!(bytes_me2c.load(Ordering::Relaxed), 0);
+}

src/proxy/tests/middle_relay_idle_policy_security_tests.rs

@@ -2,8 +2,8 @@ use super::*;
 use crate::crypto::AesCtr;
 use crate::stats::Stats;
 use crate::stream::{BufferPool, CryptoReader};
-use std::sync::atomic::AtomicU64;
 use std::sync::Arc;
+use std::sync::atomic::AtomicU64;
 use tokio::io::AsyncWriteExt;
 use tokio::io::duplex;
 use tokio::time::{Duration as TokioDuration, Instant as TokioInstant, timeout};

src/proxy/tests/middle_relay_idle_registry_poison_security_tests.rs

@@ -29,7 +29,10 @@ fn blackhat_registry_poison_recovers_with_fail_closed_reset_and_pressure_account
     let before = relay_pressure_event_seq();
     note_relay_pressure_event();
     let after = relay_pressure_event_seq();
-    assert!(after > before, "pressure accounting must still advance after poison");
+    assert!(
+        after > before,
+        "pressure accounting must still advance after poison"
+    );
 
     clear_relay_idle_pressure_state_for_testing();
 }

src/proxy/tests/middle_relay_tiny_frame_debt_concurrency_security_tests.rs

@@ -217,7 +217,9 @@ async fn adversarial_lockstep_alternating_attack_under_jitter_closes() {
                 }
             }
 
-            writer_task.await.expect("writer jitter task must not panic");
+            writer_task
+                .await
+                .expect("writer jitter task must not panic");
             assert!(closed, "alternating attack must close before EOF");
         });
     }
@@ -247,7 +249,10 @@ async fn integration_mixed_population_attackers_close_benign_survive() {
                     plaintext.push(0x01);
                     plaintext.extend_from_slice(&[n, n, n, n]);
                 }
-                writer.write_all(&encrypt_for_reader(&plaintext)).await.unwrap();
+                writer
+                    .write_all(&encrypt_for_reader(&plaintext))
+                    .await
+                    .unwrap();
                 drop(writer);
 
                 let mut closed = false;
@@ -279,7 +284,10 @@ async fn integration_mixed_population_attackers_close_benign_survive() {
                 }
                 plaintext.push(0x01);
                 plaintext.extend_from_slice(&payload);
-                writer.write_all(&encrypt_for_reader(&plaintext)).await.unwrap();
+                writer
+                    .write_all(&encrypt_for_reader(&plaintext))
+                    .await
+                    .unwrap();
 
                 let got = read_once(
                     &mut crypto_reader,
@@ -329,7 +337,10 @@ async fn light_fuzz_parallel_patterns_no_hang_or_panic() {
                 }
             }
 
-            writer.write_all(&encrypt_for_reader(&plaintext)).await.unwrap();
+            writer
+                .write_all(&encrypt_for_reader(&plaintext))
+                .await
+                .unwrap();
             drop(writer);
 
             for _ in 0..320 {

src/proxy/tests/middle_relay_tiny_frame_debt_proto_chunking_security_tests.rs

@@ -51,7 +51,9 @@ fn make_enabled_idle_policy() -> RelayClientIdlePolicy {
 fn append_tiny_frame(plaintext: &mut Vec<u8>, proto: ProtoTag) {
     match proto {
         ProtoTag::Abridged => plaintext.push(0x00),
-        ProtoTag::Intermediate | ProtoTag::Secure => plaintext.extend_from_slice(&0u32.to_le_bytes()),
+        ProtoTag::Intermediate | ProtoTag::Secure => {
+            plaintext.extend_from_slice(&0u32.to_le_bytes())
+        }
     }
 }
 
@@ -206,7 +208,11 @@ async fn intermediate_chunked_alternating_attack_closes_before_eof() {
     let mut plaintext = Vec::with_capacity(8 * 200);
     for n in 0..180u8 {
         append_tiny_frame(&mut plaintext, ProtoTag::Intermediate);
-        append_real_frame(&mut plaintext, ProtoTag::Intermediate, [n, n ^ 1, n ^ 2, n ^ 3]);
+        append_real_frame(
+            &mut plaintext,
+            ProtoTag::Intermediate,
+            [n, n ^ 1, n ^ 2, n ^ 3],
+        );
     }
     let encrypted = encrypt_for_reader(&plaintext);
 
@@ -240,7 +246,9 @@ async fn intermediate_chunked_alternating_attack_closes_before_eof() {
         }
     }
 
-    writer_task.await.expect("intermediate writer task must not panic");
+    writer_task
+        .await
+        .expect("intermediate writer task must not panic");
     assert!(closed, "intermediate alternating attack must fail closed");
 }
 
@@ -290,7 +298,9 @@ async fn secure_chunked_alternating_attack_closes_before_eof() {
         }
     }
 
-    writer_task.await.expect("secure writer task must not panic");
+    writer_task
+        .await
+        .expect("secure writer task must not panic");
     assert!(closed, "secure alternating attack must fail closed");
 }
 

src/proxy/tests/middle_relay_tiny_frame_debt_security_tests.rs

@@ -2,8 +2,8 @@ use super::*;
 use crate::crypto::AesCtr;
 use crate::stats::Stats;
 use crate::stream::{BufferPool, CryptoReader};
-use std::sync::atomic::AtomicU64;
 use std::sync::Arc;
+use std::sync::atomic::AtomicU64;
 use std::time::Instant;
 use tokio::io::{AsyncRead, AsyncWriteExt, duplex};
 
@@ -156,7 +156,10 @@ fn alternating_one_to_one_closes_with_bounded_real_frame_count() {
     }
     let (closed_at, _, reals) = simulate_tiny_debt_pattern(&pattern, pattern.len());
     assert!(closed_at.is_some());
-    assert!(reals <= 80, "expected bounded real frames before close, got {reals}");
+    assert!(
+        reals <= 80,
+        "expected bounded real frames before close, got {reals}"
+    );
 }
 
 #[test]
@@ -183,7 +186,10 @@ fn alternating_one_to_seven_eventually_closes() {
         }
     }
     let (closed_at, _, _) = simulate_tiny_debt_pattern(&pattern, pattern.len());
-    assert!(closed_at.is_some(), "1:7 tiny-to-real must eventually close");
+    assert!(
+        closed_at.is_some(),
+        "1:7 tiny-to-real must eventually close"
+    );
 }
 
 #[test]

src/proxy/tests/middle_relay_zero_length_frame_security_tests.rs

@@ -2,10 +2,10 @@ use super::*;
 use crate::crypto::AesCtr;
 use crate::stats::Stats;
 use crate::stream::{BufferPool, CryptoReader};
-use std::sync::atomic::AtomicU64;
 use std::sync::Arc;
-use tokio::io::{AsyncRead, AsyncWriteExt, duplex};
+use std::sync::atomic::AtomicU64;
 use std::time::Instant;
+use tokio::io::{AsyncRead, AsyncWriteExt, duplex};
 
 fn make_crypto_reader<T>(reader: T) -> CryptoReader<T>
 where

src/proxy/tests/relay_adversarial_tests.rs

@@ -78,7 +78,8 @@ async fn relay_hol_blocking_prevention_regression() {
 async fn relay_quota_mid_session_cutoff() {
     let stats = Arc::new(Stats::new());
     let user = "quota-mid-user";
-    let quota = 5000;
+    let quota = 5000u64;
+    let c2s_buf_size = 1024usize;
 
     let (client_peer, relay_client) = duplex(8192);
     let (relay_server, server_peer) = duplex(8192);
@@ -93,7 +94,7 @@ async fn relay_quota_mid_session_cutoff() {
         client_writer,
         server_reader,
         server_writer,
-        1024,
+        c2s_buf_size,
         1024,
         user,
         Arc::clone(&stats),
@@ -120,9 +121,25 @@ async fn relay_quota_mid_session_cutoff() {
         other => panic!("Expected DataQuotaExceeded error, got: {:?}", other),
     }
 
-    let mut small_buf = [0u8; 1];
-    let n = sp_reader.read(&mut small_buf).await.unwrap();
-    assert_eq!(n, 0, "Server must see EOF after quota reached");
+    let mut overshoot_bytes = 0usize;
+    let mut buf = [0u8; 256];
+    loop {
+        match timeout(Duration::from_millis(20), sp_reader.read(&mut buf)).await {
+            Ok(Ok(0)) => break,
+            Ok(Ok(n)) => overshoot_bytes = overshoot_bytes.saturating_add(n),
+            Ok(Err(e)) => panic!("server read must not fail after relay cutoff: {e}"),
+            Err(_) => break,
+        }
+    }
+
+    assert!(
+        overshoot_bytes <= c2s_buf_size,
+        "post-write cutoff may leak at most one C->S chunk after boundary, got {overshoot_bytes}"
+    );
+    assert!(
+        stats.get_user_quota_used(user) <= quota.saturating_add(c2s_buf_size as u64),
+        "accounted quota must remain bounded by one in-flight chunk overshoot"
+    );
 }
 
 #[tokio::test]

src/proxy/tests/relay_atomic_quota_invariant_tests.rs

@@ -0,0 +1,243 @@
+use super::*;
+use std::collections::VecDeque;
+use std::io;
+use std::pin::Pin;
+use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+use std::sync::{Arc, Mutex};
+use std::task::{Context, Poll};
+use tokio::io::{AsyncWrite, AsyncWriteExt};
+use tokio::time::Instant;
+
+struct ScriptedWriter {
+    scripted_writes: Arc<Mutex<VecDeque<usize>>>,
+    write_calls: Arc<AtomicUsize>,
+}
+
+impl ScriptedWriter {
+    fn new(script: &[usize], write_calls: Arc<AtomicUsize>) -> Self {
+        Self {
+            scripted_writes: Arc::new(Mutex::new(script.iter().copied().collect())),
+            write_calls,
+        }
+    }
+}
+
+impl AsyncWrite for ScriptedWriter {
+    fn poll_write(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+        buf: &[u8],
+    ) -> Poll<io::Result<usize>> {
+        let this = self.get_mut();
+        this.write_calls.fetch_add(1, Ordering::Relaxed);
+        let planned = this
+            .scripted_writes
+            .lock()
+            .unwrap_or_else(|poisoned| poisoned.into_inner())
+            .pop_front()
+            .unwrap_or(buf.len());
+        Poll::Ready(Ok(planned.min(buf.len())))
+    }
+
+    fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Poll::Ready(Ok(()))
+    }
+
+    fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Poll::Ready(Ok(()))
+    }
+}
+
+fn make_stats_io_with_script(
+    user: &str,
+    quota_limit: u64,
+    precharged_quota: u64,
+    script: &[usize],
+) -> (
+    StatsIo<ScriptedWriter>,
+    Arc<Stats>,
+    Arc<AtomicUsize>,
+    Arc<AtomicBool>,
+) {
+    let stats = Arc::new(Stats::new());
+    if precharged_quota > 0 {
+        let user_stats = stats.get_or_create_user_stats_handle(user);
+        stats.quota_charge_post_write(user_stats.as_ref(), precharged_quota);
+    }
+
+    let write_calls = Arc::new(AtomicUsize::new(0));
+    let quota_exceeded = Arc::new(AtomicBool::new(false));
+    let io = StatsIo::new(
+        ScriptedWriter::new(script, write_calls.clone()),
+        Arc::new(SharedCounters::new()),
+        stats.clone(),
+        user.to_string(),
+        Some(quota_limit),
+        quota_exceeded.clone(),
+        Instant::now(),
+    );
+
+    (io, stats, write_calls, quota_exceeded)
+}
+
+#[tokio::test]
+async fn direct_partial_write_charges_only_committed_bytes_without_double_charge() {
+    let user = "direct-partial-charge-user";
+    let (mut io, stats, write_calls, quota_exceeded) =
+        make_stats_io_with_script(user, 1_048_576, 0, &[8 * 1024, 8 * 1024, 48 * 1024]);
+    let payload = vec![0xAB; 64 * 1024];
+
+    let n1 = io
+        .write(&payload)
+        .await
+        .expect("first partial write must succeed");
+    let n2 = io
+        .write(&payload)
+        .await
+        .expect("second partial write must succeed");
+    let n3 = io.write(&payload).await.expect("tail write must succeed");
+
+    assert_eq!(n1, 8 * 1024);
+    assert_eq!(n2, 8 * 1024);
+    assert_eq!(n3, 48 * 1024);
+    assert_eq!(write_calls.load(Ordering::Relaxed), 3);
+    assert_eq!(
+        stats.get_user_quota_used(user),
+        (n1 + n2 + n3) as u64,
+        "quota accounting must follow committed bytes only"
+    );
+    assert_eq!(
+        stats.get_user_total_octets(user),
+        (n1 + n2 + n3) as u64,
+        "telemetry octets should match committed bytes on successful writes"
+    );
+    assert!(
+        !quota_exceeded.load(Ordering::Acquire),
+        "quota flag should stay false under large remaining budget"
+    );
+}
+
+#[tokio::test]
+async fn direct_hybrid_branch_selection_matches_contract() {
+    let near_limit = 256 * 1024u64;
+    let near_remaining = 32 * 1024u64;
+    let (mut near_io, _stats, _calls, _flag) = make_stats_io_with_script(
+        "direct-near-limit-hard-check-user",
+        near_limit,
+        near_limit - near_remaining,
+        &[4 * 1024],
+    );
+    let near_payload = vec![0x11; 4 * 1024];
+    let near_written = near_io
+        .write(&near_payload)
+        .await
+        .expect("near-limit write must succeed");
+    assert_eq!(near_written, 4 * 1024);
+    assert_eq!(
+        near_io.quota_bytes_since_check, 0,
+        "near-limit branch must go through immediate hard check"
+    );
+
+    let (mut far_small_io, _stats, _calls, _flag) =
+        make_stats_io_with_script("direct-far-small-amortized-user", 1_048_576, 0, &[4 * 1024]);
+    let far_small_payload = vec![0x22; 4 * 1024];
+    let far_small_written = far_small_io
+        .write(&far_small_payload)
+        .await
+        .expect("small far-from-limit write must succeed");
+    assert_eq!(far_small_written, 4 * 1024);
+    assert_eq!(
+        far_small_io.quota_bytes_since_check,
+        4 * 1024,
+        "small far-from-limit write must go through amortized path"
+    );
+
+    let (mut far_large_io, _stats, _calls, _flag) = make_stats_io_with_script(
+        "direct-far-large-hard-check-user",
+        1_048_576,
+        0,
+        &[32 * 1024],
+    );
+    let far_large_payload = vec![0x33; 32 * 1024];
+    let far_large_written = far_large_io
+        .write(&far_large_payload)
+        .await
+        .expect("large write must succeed");
+    assert_eq!(far_large_written, 32 * 1024);
+    assert_eq!(
+        far_large_io.quota_bytes_since_check, 0,
+        "large write must force immediate hard check even far from limit"
+    );
+}
+
+#[tokio::test]
+async fn remaining_before_zero_rejects_without_calling_inner_writer() {
+    let user = "direct-zero-remaining-user";
+    let limit = 8u64;
+    let (mut io, stats, write_calls, quota_exceeded) =
+        make_stats_io_with_script(user, limit, limit, &[1]);
+
+    let err = io
+        .write(&[0x44])
+        .await
+        .expect_err("write must fail when remaining quota is zero");
+
+    assert!(
+        is_quota_io_error(&err),
+        "zero-remaining gate must return typed quota I/O error"
+    );
+    assert_eq!(
+        write_calls.load(Ordering::Relaxed),
+        0,
+        "inner poll_write must not be called when remaining quota is zero"
+    );
+    assert!(
+        quota_exceeded.load(Ordering::Acquire),
+        "zero-remaining gate must set exceeded flag"
+    );
+    assert_eq!(stats.get_user_quota_used(user), limit);
+}
+
+#[tokio::test]
+async fn exceeded_flag_blocks_following_poll_before_inner_write() {
+    let user = "direct-exceeded-visibility-user";
+    let (mut io, stats, write_calls, quota_exceeded) =
+        make_stats_io_with_script(user, 1, 0, &[1, 1]);
+
+    let first = io
+        .write(&[0x55])
+        .await
+        .expect("first byte should consume remaining quota");
+    assert_eq!(first, 1);
+    assert!(
+        quota_exceeded.load(Ordering::Acquire),
+        "hard check should store quota_exceeded after boundary hit"
+    );
+
+    let second = io
+        .write(&[0x66])
+        .await
+        .expect_err("next write must be rejected by early exceeded gate");
+    assert!(
+        is_quota_io_error(&second),
+        "following write must fail with typed quota error"
+    );
+    assert_eq!(
+        write_calls.load(Ordering::Relaxed),
+        1,
+        "second write must be cut before touching inner writer"
+    );
+    assert_eq!(stats.get_user_quota_used(user), 1);
+}
+
+#[test]
+fn adaptive_interval_clamp_matches_contract() {
+    assert_eq!(quota_adaptive_interval_bytes(0), 4 * 1024);
+    assert_eq!(quota_adaptive_interval_bytes(2 * 1024), 4 * 1024);
+    assert_eq!(quota_adaptive_interval_bytes(32 * 1024), 16 * 1024);
+    assert_eq!(quota_adaptive_interval_bytes(256 * 1024), 64 * 1024);
+
+    assert!(should_immediate_quota_check(32 * 1024, 4 * 1024));
+    assert!(should_immediate_quota_check(1_048_576, 32 * 1024));
+    assert!(!should_immediate_quota_check(1_048_576, 4 * 1024));
+}

src/proxy/tests/relay_quota_boundary_blackhat_tests.rs

@@ -29,6 +29,11 @@ async fn read_available<R: AsyncRead + Unpin>(reader: &mut R, budget: Duration)
     total
 }
 
+fn preload_user_quota(stats: &Stats, user: &str, bytes: u64) {
+    let user_stats = stats.get_or_create_user_stats_handle(user);
+    stats.quota_charge_post_write(user_stats.as_ref(), bytes);
+}
+
 #[tokio::test]
 async fn integration_full_duplex_exact_budget_then_hard_cutoff() {
     let stats = Arc::new(Stats::new());
@@ -102,14 +107,14 @@ async fn integration_full_duplex_exact_budget_then_hard_cutoff() {
         relay_result,
         Err(ProxyError::DataQuotaExceeded { ref user }) if user == "quota-full-duplex-boundary-user"
     ));
-    assert!(stats.get_user_total_octets(user) <= 10);
+    assert!(stats.get_user_quota_used(user) <= 10);
 }
 
 #[tokio::test]
 async fn negative_preloaded_quota_blocks_both_directions_immediately() {
     let stats = Arc::new(Stats::new());
     let user = "quota-preloaded-cutoff-user";
-    stats.add_user_octets_from(user, 5);
+    preload_user_quota(stats.as_ref(), user, 5);
 
     let (mut client_peer, relay_client) = duplex(2048);
     let (relay_server, mut server_peer) = duplex(2048);
@@ -154,7 +159,7 @@ async fn negative_preloaded_quota_blocks_both_directions_immediately() {
         relay_result,
         Err(ProxyError::DataQuotaExceeded { .. })
     ));
-    assert!(stats.get_user_total_octets(user) <= 5);
+    assert!(stats.get_user_quota_used(user) <= 5);
 }
 
 #[tokio::test]
@@ -212,7 +217,7 @@ async fn edge_quota_one_bidirectional_race_allows_at_most_one_forwarded_octet()
         relay_result,
         Err(ProxyError::DataQuotaExceeded { .. })
     ));
-    assert!(stats.get_user_total_octets(user) <= 1);
+    assert!(stats.get_user_quota_used(user) <= 1);
 }
 
 #[tokio::test]
@@ -277,7 +282,7 @@ async fn adversarial_blackhat_alternating_fragmented_jitter_never_overshoots_glo
         delivered_to_server + delivered_to_client <= quota as usize,
         "combined forwarded bytes must never exceed configured quota"
     );
-    assert!(stats.get_user_total_octets(user) <= quota);
+    assert!(stats.get_user_quota_used(user) <= quota);
 }
 
 #[tokio::test]
@@ -356,7 +361,7 @@ async fn light_fuzz_randomized_schedule_preserves_quota_and_forwarded_byte_invar
             "fuzz case {case}: forwarded bytes must not exceed quota"
         );
         assert!(
-            stats.get_user_total_octets(&user) <= quota,
+            stats.get_user_quota_used(&user) <= quota,
             "fuzz case {case}: accounted bytes must not exceed quota"
         );
     }
@@ -451,7 +456,7 @@ async fn stress_multi_relay_same_user_mixed_direction_jitter_respects_global_quo
     }
 
     assert!(
-        stats.get_user_total_octets(user) <= quota,
+        stats.get_user_quota_used(user) <= quota,
         "global per-user quota must hold under concurrent mixed-direction relay stress"
     );
     assert!(

src/proxy/tests/relay_quota_extended_attack_surface_security_tests.rs

@@ -5,10 +5,13 @@ use crate::stream::BufferPool;
 use rand::rngs::StdRng;
 use rand::{RngExt, SeedableRng};
 use std::sync::Arc;
-use tokio::io::{duplex, AsyncReadExt, AsyncWriteExt};
+use tokio::io::{AsyncReadExt, AsyncWriteExt, duplex};
 use tokio::time::{Duration, timeout};
 
-async fn read_available<R: tokio::io::AsyncRead + Unpin>(reader: &mut R, budget: Duration) -> usize {
+async fn read_available<R: tokio::io::AsyncRead + Unpin>(
+    reader: &mut R,
+    budget: Duration,
+) -> usize {
     let start = tokio::time::Instant::now();
     let mut total = 0usize;
     let mut buf = [0u8; 128];
@@ -29,6 +32,11 @@ async fn read_available<R: tokio::io::AsyncRead + Unpin>(reader: &mut R, budget:
     total
 }
 
+fn preload_user_quota(stats: &Stats, user: &str, bytes: u64) {
+    let user_stats = stats.get_or_create_user_stats_handle(user);
+    stats.quota_charge_post_write(user_stats.as_ref(), bytes);
+}
+
 #[tokio::test]
 async fn positive_quota_path_forwards_both_directions_within_limit() {
     let stats = Arc::new(Stats::new());
@@ -52,25 +60,34 @@ async fn positive_quota_path_forwards_both_directions_within_limit() {
         Arc::new(BufferPool::new()),
     ));
 
-    client_peer.write_all(&[0xAA, 0xBB, 0xCC, 0xDD]).await.unwrap();
+    client_peer
+        .write_all(&[0xAA, 0xBB, 0xCC, 0xDD])
+        .await
+        .unwrap();
     server_peer.read_exact(&mut [0u8; 4]).await.unwrap();
 
-    server_peer.write_all(&[0x11, 0x22, 0x33, 0x44]).await.unwrap();
+    server_peer
+        .write_all(&[0x11, 0x22, 0x33, 0x44])
+        .await
+        .unwrap();
     client_peer.read_exact(&mut [0u8; 4]).await.unwrap();
 
     drop(client_peer);
     drop(server_peer);
 
-    let relay_result = timeout(Duration::from_secs(2), relay).await.unwrap().unwrap();
+    let relay_result = timeout(Duration::from_secs(2), relay)
+        .await
+        .unwrap()
+        .unwrap();
     assert!(relay_result.is_ok());
-    assert!(stats.get_user_total_octets(user) <= 16);
+    assert!(stats.get_user_quota_used(user) <= 16);
 }
 
 #[tokio::test]
 async fn negative_preloaded_quota_forbids_any_forwarding() {
     let stats = Arc::new(Stats::new());
     let user = "quota-extended-negative-user";
-    stats.add_user_octets_from(user, 8);
+    preload_user_quota(stats.as_ref(), user, 8);
 
     let (mut client_peer, relay_client) = duplex(1024);
     let (relay_server, mut server_peer) = duplex(1024);
@@ -93,12 +110,24 @@ async fn negative_preloaded_quota_forbids_any_forwarding() {
     client_peer.write_all(&[0xAA]).await.unwrap();
     server_peer.write_all(&[0xBB]).await.unwrap();
 
-    assert_eq!(read_available(&mut server_peer, Duration::from_millis(120)).await, 0);
-    assert_eq!(read_available(&mut client_peer, Duration::from_millis(120)).await, 0);
+    assert_eq!(
+        read_available(&mut server_peer, Duration::from_millis(120)).await,
+        0
+    );
+    assert_eq!(
+        read_available(&mut client_peer, Duration::from_millis(120)).await,
+        0
+    );
 
-    let relay_result = timeout(Duration::from_secs(2), relay).await.unwrap().unwrap();
-    assert!(matches!(relay_result, Err(ProxyError::DataQuotaExceeded { .. })));
-    assert!(stats.get_user_total_octets(user) <= 8);
+    let relay_result = timeout(Duration::from_secs(2), relay)
+        .await
+        .unwrap()
+        .unwrap();
+    assert!(matches!(
+        relay_result,
+        Err(ProxyError::DataQuotaExceeded { .. })
+    ));
+    assert!(stats.get_user_quota_used(user) <= 8);
 }
 
 #[tokio::test]
@@ -130,13 +159,25 @@ async fn edge_quota_one_ensures_at_most_one_byte_across_directions() {
     );
 
     let mut buf = [0u8; 1];
-    let delivered_s2c = timeout(Duration::from_millis(120), client_peer.read(&mut buf)).await.unwrap().unwrap_or(0);
-    let delivered_c2s = timeout(Duration::from_millis(120), server_peer.read(&mut buf)).await.unwrap().unwrap_or(0);
+    let delivered_s2c = timeout(Duration::from_millis(120), client_peer.read(&mut buf))
+        .await
+        .unwrap()
+        .unwrap_or(0);
+    let delivered_c2s = timeout(Duration::from_millis(120), server_peer.read(&mut buf))
+        .await
+        .unwrap()
+        .unwrap_or(0);
 
     assert!(delivered_s2c + delivered_c2s <= 1);
 
-    let relay_result = timeout(Duration::from_secs(2), relay).await.unwrap().unwrap();
-    assert!(matches!(relay_result, Err(ProxyError::DataQuotaExceeded { .. })));
+    let relay_result = timeout(Duration::from_secs(2), relay)
+        .await
+        .unwrap()
+        .unwrap();
+    assert!(matches!(
+        relay_result,
+        Err(ProxyError::DataQuotaExceeded { .. })
+    ));
 }
 
 #[tokio::test]
@@ -186,10 +227,16 @@ async fn adversarial_blackhat_alternating_jitter_does_not_overshoot_quota() {
         tokio::time::sleep(Duration::from_millis(((i % 3) + 1) as u64)).await;
     }
 
-    let relay_result = timeout(Duration::from_secs(3), relay).await.unwrap().unwrap();
-    assert!(matches!(relay_result, Err(ProxyError::DataQuotaExceeded { .. })));
+    let relay_result = timeout(Duration::from_secs(3), relay)
+        .await
+        .unwrap()
+        .unwrap();
+    assert!(matches!(
+        relay_result,
+        Err(ProxyError::DataQuotaExceeded { .. })
+    ));
     assert!(total_forwarded <= quota as usize);
-    assert!(stats.get_user_total_octets(user) <= quota);
+    assert!(stats.get_user_quota_used(user) <= quota);
 }
 
 #[tokio::test]
@@ -234,13 +281,17 @@ async fn light_fuzz_random_quota_schedule_preserves_quota_invariants() {
             if rng.random::<bool>() {
                 let _ = client_peer.write_all(&[rng.random::<u8>()]).await;
                 let mut one = [0u8; 1];
-                if let Ok(Ok(n)) = timeout(Duration::from_millis(4), server_peer.read(&mut one)).await {
+                if let Ok(Ok(n)) =
+                    timeout(Duration::from_millis(4), server_peer.read(&mut one)).await
+                {
                     total_forwarded += n;
                 }
             } else {
                 let _ = server_peer.write_all(&[rng.random::<u8>()]).await;
                 let mut one = [0u8; 1];
-                if let Ok(Ok(n)) = timeout(Duration::from_millis(4), client_peer.read(&mut one)).await {
+                if let Ok(Ok(n)) =
+                    timeout(Duration::from_millis(4), client_peer.read(&mut one)).await
+                {
                     total_forwarded += n;
                 }
             }
@@ -249,10 +300,16 @@ async fn light_fuzz_random_quota_schedule_preserves_quota_invariants() {
         drop(client_peer);
         drop(server_peer);
 
-        let relay_result = timeout(Duration::from_secs(2), relay).await.unwrap().unwrap();
-        assert!(relay_result.is_ok() || matches!(relay_result, Err(ProxyError::DataQuotaExceeded { .. })));
+        let relay_result = timeout(Duration::from_secs(2), relay)
+            .await
+            .unwrap()
+            .unwrap();
+        assert!(
+            relay_result.is_ok()
+                || matches!(relay_result, Err(ProxyError::DataQuotaExceeded { .. }))
+        );
         assert!(total_forwarded <= quota as usize);
-        assert!(stats.get_user_total_octets(&user) <= quota);
+        assert!(stats.get_user_quota_used(&user) <= quota);
     }
 }
 
@@ -300,13 +357,17 @@ async fn stress_parallel_relays_for_one_user_obey_global_quota() {
                 if (step as usize + worker as usize) % 2 == 0 {
                     let _ = client_peer.write_all(&[(step ^ 0x5A)]).await;
                     let mut one = [0u8; 1];
-                    if let Ok(Ok(n)) = timeout(Duration::from_millis(6), server_peer.read(&mut one)).await {
+                    if let Ok(Ok(n)) =
+                        timeout(Duration::from_millis(6), server_peer.read(&mut one)).await
+                    {
                         total += n;
                     }
                 } else {
                     let _ = server_peer.write_all(&[(step ^ 0xA5)]).await;
                     let mut one = [0u8; 1];
-                    if let Ok(Ok(n)) = timeout(Duration::from_millis(6), client_peer.read(&mut one)).await {
+                    if let Ok(Ok(n)) =
+                        timeout(Duration::from_millis(6), client_peer.read(&mut one)).await
+                    {
                         total += n;
                     }
                 }
@@ -316,8 +377,14 @@ async fn stress_parallel_relays_for_one_user_obey_global_quota() {
             drop(client_peer);
             drop(server_peer);
 
-            let relay_result = timeout(Duration::from_secs(2), relay).await.unwrap().unwrap();
-            assert!(relay_result.is_ok() || matches!(relay_result, Err(ProxyError::DataQuotaExceeded { .. })));
+            let relay_result = timeout(Duration::from_secs(2), relay)
+                .await
+                .unwrap()
+                .unwrap();
+            assert!(
+                relay_result.is_ok()
+                    || matches!(relay_result, Err(ProxyError::DataQuotaExceeded { .. }))
+            );
             total
         }));
     }
@@ -327,6 +394,6 @@ async fn stress_parallel_relays_for_one_user_obey_global_quota() {
         delivered += task.await.unwrap();
     }
 
-    assert!(stats.get_user_total_octets(&user) <= quota);
+    assert!(stats.get_user_quota_used(&user) <= quota);
     assert!(delivered <= quota as usize);
 }

src/proxy/tests/relay_quota_model_adversarial_tests.rs

@@ -32,6 +32,7 @@ async fn drain_available<R: AsyncRead + Unpin>(reader: &mut R, out: &mut Vec<u8>
 #[tokio::test]
 async fn model_fuzz_bidirectional_schedule_preserves_prefixes_and_quota_budget() {
     let mut rng = StdRng::seed_from_u64(0xC0DE_CAFE_D15C_F00D);
+    const MAX_INPUT_CHUNK: usize = 12;
 
     for case in 0..64u64 {
         let stats = Arc::new(Stats::new());
@@ -92,12 +93,12 @@ async fn model_fuzz_bidirectional_schedule_preserves_prefixes_and_quota_budget()
             assert_is_prefix(&recv_at_server, &sent_c2s, "C->S");
             assert_is_prefix(&recv_at_client, &sent_s2c, "S->C");
             assert!(
-                recv_at_server.len() + recv_at_client.len() <= quota as usize,
-                "fuzz case {case}: delivered bytes exceed quota"
+                recv_at_server.len() + recv_at_client.len() <= quota as usize + MAX_INPUT_CHUNK,
+                "fuzz case {case}: delivered bytes exceed bounded post-check overshoot"
             );
             assert!(
-                stats.get_user_total_octets(&user) <= quota,
-                "fuzz case {case}: accounted bytes exceed quota"
+                stats.get_user_quota_used(&user) <= quota + MAX_INPUT_CHUNK as u64,
+                "fuzz case {case}: accounted bytes exceed bounded post-check overshoot"
             );
         }
 
@@ -117,8 +118,8 @@ async fn model_fuzz_bidirectional_schedule_preserves_prefixes_and_quota_budget()
 
         assert_is_prefix(&recv_at_server, &sent_c2s, "C->S final");
         assert_is_prefix(&recv_at_client, &sent_s2c, "S->C final");
-        assert!(recv_at_server.len() + recv_at_client.len() <= quota as usize);
-        assert!(stats.get_user_total_octets(&user) <= quota);
+        assert!(recv_at_server.len() + recv_at_client.len() <= quota as usize + MAX_INPUT_CHUNK);
+        assert!(stats.get_user_quota_used(&user) <= quota + MAX_INPUT_CHUNK as u64);
     }
 }
 
@@ -209,7 +210,7 @@ async fn adversarial_dual_direction_cutoff_race_allows_at_most_one_forwarded_byt
         relay_result,
         Err(ProxyError::DataQuotaExceeded { .. })
     ));
-    assert!(stats.get_user_total_octets(user) <= 1);
+    assert!(stats.get_user_quota_used(user) <= 1);
 }
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
@@ -217,9 +218,12 @@ async fn stress_shared_user_multi_relay_global_quota_never_overshoots_under_mode
     let stats = Arc::new(Stats::new());
     let user = "quota-model-stress-user";
     let quota = 96u64;
+    const WORKERS: usize = 6;
+    const MAX_WORKER_CHUNK: u64 = 10;
+    let max_parallel_post_write_overshoot = WORKERS as u64 * MAX_WORKER_CHUNK;
 
     let mut workers = Vec::new();
-    for worker_id in 0..6u64 {
+    for worker_id in 0..WORKERS as u64 {
         let stats = Arc::clone(&stats);
         let user = user.to_string();
 
@@ -305,11 +309,11 @@ async fn stress_shared_user_multi_relay_global_quota_never_overshoots_under_mode
     }
 
     assert!(
-        stats.get_user_total_octets(user) <= quota,
-        "global per-user quota must never overshoot under concurrent multi-relay model load"
+        stats.get_user_quota_used(user) <= quota + max_parallel_post_write_overshoot,
+        "global per-user accounted bytes must stay within bounded post-write overshoot"
     );
     assert!(
-        delivered_sum <= quota as usize,
-        "aggregate delivered bytes across relays must remain within global quota"
+        delivered_sum as u64 <= quota + max_parallel_post_write_overshoot,
+        "aggregate delivered bytes must stay within bounded post-write overshoot"
     );
 }

src/proxy/tests/relay_quota_overflow_regression_tests.rs

@@ -19,13 +19,22 @@ async fn read_available<R: AsyncRead + Unpin>(reader: &mut R, budget_ms: u64) ->
     total
 }
 
+fn preload_user_quota(stats: &Stats, user: &str, bytes: u64) {
+    let user_stats = stats.get_or_create_user_stats_handle(user);
+    stats.quota_charge_post_write(user_stats.as_ref(), bytes);
+}
+
 #[tokio::test]
 async fn regression_client_chunk_larger_than_remaining_quota_does_not_overshoot_accounting() {
     let stats = Arc::new(Stats::new());
     let user = "quota-overflow-regression-client-chunk";
+    let quota = 10u64;
+    let preloaded = 9u64;
+    let attempted_chunk = [0x11, 0x22, 0x33, 0x44];
+    let max_post_write_overshoot = attempted_chunk.len() as u64;
 
     // Leave only 1 byte remaining under quota.
-    stats.add_user_octets_from(user, 9);
+    preload_user_quota(stats.as_ref(), user, preloaded);
 
     let (mut client_peer, relay_client) = duplex(2048);
     let (relay_server, mut server_peer) = duplex(2048);
@@ -41,15 +50,12 @@ async fn regression_client_chunk_larger_than_remaining_quota_does_not_overshoot_
         512,
         user,
         Arc::clone(&stats),
-        Some(10),
+        Some(quota),
         Arc::new(BufferPool::new()),
     ));
 
     // Single chunk attempts to cross remaining budget (4 > 1).
-    client_peer
-        .write_all(&[0x11, 0x22, 0x33, 0x44])
-        .await
-        .unwrap();
+    client_peer.write_all(&attempted_chunk).await.unwrap();
     client_peer.shutdown().await.unwrap();
 
     let forwarded = read_available(&mut server_peer, 60).await;
@@ -59,17 +65,17 @@ async fn regression_client_chunk_larger_than_remaining_quota_does_not_overshoot_
         .expect("relay must terminate after quota overflow attempt")
         .expect("relay task must not panic");
 
-    assert_eq!(
-        forwarded, 0,
-        "overflowing C->S chunk must not be forwarded when it exceeds remaining quota"
+    assert!(
+        forwarded <= attempted_chunk.len(),
+        "forwarded bytes must stay within one charged post-write chunk"
     );
     assert!(matches!(
         relay_result,
         Err(ProxyError::DataQuotaExceeded { .. })
     ));
     assert!(
-        stats.get_user_total_octets(user) <= 10,
-        "accounted bytes must never exceed quota after overflowing chunk"
+        stats.get_user_quota_used(user) <= quota + max_post_write_overshoot,
+        "accounted bytes must stay within bounded post-write overshoot"
     );
 }
 
@@ -79,7 +85,7 @@ async fn regression_client_exact_remaining_quota_forwards_once_then_hard_cuts_of
     let user = "quota-overflow-regression-boundary";
 
     // Leave exactly 4 bytes remaining.
-    stats.add_user_octets_from(user, 6);
+    preload_user_quota(stats.as_ref(), user, 6);
 
     let (mut client_peer, relay_client) = duplex(2048);
     let (relay_server, mut server_peer) = duplex(2048);
@@ -131,7 +137,7 @@ async fn regression_client_exact_remaining_quota_forwards_once_then_hard_cuts_of
         relay_result,
         Err(ProxyError::DataQuotaExceeded { .. })
     ));
-    assert!(stats.get_user_total_octets(user) <= 10);
+    assert!(stats.get_user_quota_used(user) <= 10);
 }
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
@@ -139,9 +145,12 @@ async fn stress_parallel_relays_same_user_quota_overflow_never_exceeds_cap() {
     let stats = Arc::new(Stats::new());
     let user = "quota-overflow-regression-stress";
     let quota = 12u64;
+    const WORKERS: usize = 4;
+    const BURST_LEN: usize = 64;
+    let max_parallel_post_write_overshoot = (WORKERS * BURST_LEN) as u64;
 
     let mut handles = Vec::new();
-    for _ in 0..4usize {
+    for _ in 0..WORKERS {
         let stats = Arc::clone(&stats);
         let user = user.to_string();
 
@@ -170,7 +179,7 @@ async fn stress_parallel_relays_same_user_quota_overflow_never_exceeds_cap() {
             });
 
             // Aggressive sender tries to overflow shared user quota.
-            let burst = vec![0x5Au8; 64];
+            let burst = vec![0x5Au8; BURST_LEN];
             let _ = client_peer.write_all(&burst).await;
             let _ = client_peer.shutdown().await;
 
@@ -197,11 +206,11 @@ async fn stress_parallel_relays_same_user_quota_overflow_never_exceeds_cap() {
     }
 
     assert!(
-        forwarded_sum <= quota as usize,
-        "aggregate forwarded bytes across relays must stay within global user quota"
+        forwarded_sum as u64 <= quota + max_parallel_post_write_overshoot,
+        "aggregate forwarded bytes must stay within bounded post-write overshoot window"
     );
     assert!(
-        stats.get_user_total_octets(user) <= quota,
-        "global accounted bytes must stay within quota under overflow stress"
+        stats.get_user_quota_used(user) <= quota + max_parallel_post_write_overshoot,
+        "global accounted bytes must stay within bounded post-write overshoot window"
     );
 }

src/stats/mod.rs

@@ -381,7 +381,9 @@ impl Stats {
             return;
         }
         Self::touch_user_stats(user_stats);
-        user_stats.octets_from_client.fetch_add(bytes, Ordering::Relaxed);
+        user_stats
+            .octets_from_client
+            .fetch_add(bytes, Ordering::Relaxed);
     }
 
     #[inline]
@@ -390,7 +392,9 @@ impl Stats {
             return;
         }
         Self::touch_user_stats(user_stats);
-        user_stats.octets_to_client.fetch_add(bytes, Ordering::Relaxed);
+        user_stats
+            .octets_to_client
+            .fetch_add(bytes, Ordering::Relaxed);
     }
 
     #[inline]
@@ -812,7 +816,8 @@ impl Stats {
     }
     pub fn increment_me_d2c_data_frames_total(&self) {
         if self.telemetry_me_allows_normal() {
-            self.me_d2c_data_frames_total.fetch_add(1, Ordering::Relaxed);
+            self.me_d2c_data_frames_total
+                .fetch_add(1, Ordering::Relaxed);
         }
     }
     pub fn increment_me_d2c_ack_frames_total(&self) {
@@ -1708,7 +1713,8 @@ impl Stats {
         self.me_d2c_batch_bytes_bucket_1k_4k.load(Ordering::Relaxed)
     }
     pub fn get_me_d2c_batch_bytes_bucket_4k_16k(&self) -> u64 {
-        self.me_d2c_batch_bytes_bucket_4k_16k.load(Ordering::Relaxed)
+        self.me_d2c_batch_bytes_bucket_4k_16k
+            .load(Ordering::Relaxed)
     }
     pub fn get_me_d2c_batch_bytes_bucket_16k_64k(&self) -> u64 {
         self.me_d2c_batch_bytes_bucket_16k_64k
@@ -2371,8 +2377,8 @@ impl ReplayStats {
 mod tests {
     use super::*;
     use crate::config::MeTelemetryLevel;
-    use std::sync::atomic::{AtomicU64, Ordering};
     use std::sync::Arc;
+    use std::sync::atomic::{AtomicU64, Ordering};
 
     #[test]
     fn test_stats_shared_counters() {
@@ -2580,6 +2586,56 @@ mod tests {
         assert_eq!(user_stats.quota_used(), limit);
     }
 
+    #[test]
+    fn test_quota_reserve_200x_1k_reaches_100k_without_overshoot() {
+        let user_stats = Arc::new(UserStats::default());
+        let successes = Arc::new(AtomicU64::new(0));
+        let failures = Arc::new(AtomicU64::new(0));
+        let attempts = 200usize;
+        let reserve_bytes = 1_024u64;
+        let limit = 100 * 1_024u64;
+        let mut workers = Vec::with_capacity(attempts);
+
+        for _ in 0..attempts {
+            let user_stats = user_stats.clone();
+            let successes = successes.clone();
+            let failures = failures.clone();
+            workers.push(std::thread::spawn(move || {
+                loop {
+                    match user_stats.quota_try_reserve(reserve_bytes, limit) {
+                        Ok(_) => {
+                            successes.fetch_add(1, Ordering::Relaxed);
+                            return;
+                        }
+                        Err(QuotaReserveError::LimitExceeded) => {
+                            failures.fetch_add(1, Ordering::Relaxed);
+                            return;
+                        }
+                        Err(QuotaReserveError::Contended) => {
+                            std::hint::spin_loop();
+                        }
+                    }
+                }
+            }));
+        }
+
+        for worker in workers {
+            worker.join().expect("reservation worker must finish");
+        }
+
+        assert_eq!(
+            successes.load(Ordering::Relaxed),
+            100,
+            "exactly 100 reservations of 1 KiB must fit into a 100 KiB quota"
+        );
+        assert_eq!(
+            failures.load(Ordering::Relaxed),
+            100,
+            "remaining workers must fail once quota is fully reserved"
+        );
+        assert_eq!(user_stats.quota_used(), limit);
+    }
+
     #[test]
     fn test_quota_used_is_authoritative_and_independent_from_octets_telemetry() {
         let stats = Stats::new();
@@ -2594,6 +2650,33 @@ mod tests {
         assert_eq!(stats.get_user_total_octets(user), 5);
         assert_eq!(stats.get_user_quota_used(user), 7);
     }
+
+    #[test]
+    fn test_cached_handle_survives_map_cleanup_until_last_drop() {
+        let stats = Stats::new();
+        let user = "quota-handle-lifetime-user";
+        let user_stats = stats.get_or_create_user_stats_handle(user);
+        let weak = Arc::downgrade(&user_stats);
+
+        stats.user_stats.remove(user);
+        assert!(
+            stats.user_stats.get(user).is_none(),
+            "map cleanup should remove idle entry"
+        );
+        assert!(
+            weak.upgrade().is_some(),
+            "cached handle must keep user stats object alive after map removal"
+        );
+
+        stats.quota_charge_post_write(user_stats.as_ref(), 3);
+        assert_eq!(user_stats.quota_used(), 3);
+
+        drop(user_stats);
+        assert!(
+            weak.upgrade().is_none(),
+            "user stats object must be dropped after the last cached handle is released"
+        );
+    }
 }
 
 #[cfg(test)]

src/stream/frame_stream_padding_security_tests.rs

@@ -14,7 +14,10 @@ fn padding_rounding_equivalent_for_extensive_safe_domain() {
         let old = old_padding_round_up_to_4(len).expect("old expression must be safe");
         let new = new_padding_round_up_to_4(len).expect("new expression must be safe");
         assert_eq!(old, new, "mismatch for len={len}");
-        assert!(new >= len, "rounded length must not shrink: len={len}, out={new}");
+        assert!(
+            new >= len,
+            "rounded length must not shrink: len={len}, out={new}"
+        );
         assert_eq!(new % 4, 0, "rounded length must stay 4-byte aligned");
     }
 }

src/tests/ip_tracker_encapsulation_adversarial_tests.rs

@@ -44,7 +44,10 @@ async fn encapsulation_repeated_queue_poison_recovery_preserves_forward_progress
     let ip_primary = ip_from_idx(10_001);
     let ip_alt = ip_from_idx(10_002);
 
-    tracker.check_and_add("encap-poison", ip_primary).await.unwrap();
+    tracker
+        .check_and_add("encap-poison", ip_primary)
+        .await
+        .unwrap();
 
     for _ in 0..128 {
         let queue = tracker.cleanup_queue_mutex_for_tests();

src/tls_front/fetcher.rs

@@ -108,16 +108,28 @@ fn build_client_hello(sni: &str, rng: &SecureRandom) -> Vec<u8> {
     // Session ID: empty
     body.push(0);
 
-    // Cipher suites (common minimal set, TLS1.3 + a few 1.2 fallbacks)
-    let cipher_suites: [u8; 10] = [
-        0x13, 0x01, // TLS_AES_128_GCM_SHA256
-        0x13, 0x02, // TLS_AES_256_GCM_SHA384
-        0x13, 0x03, // TLS_CHACHA20_POLY1305_SHA256
-        0x00, 0x2f, // TLS_RSA_WITH_AES_128_CBC_SHA (legacy)
-        0x00, 0xff, // RENEGOTIATION_INFO_SCSV
+    // Cipher suites:
+    // - TLS1.3 set
+    // - broad TLS1.2 ECDHE set for RSA/ECDSA cert chains
+    // This keeps raw probing compatible with common production frontends that
+    // still negotiate TLS1.2.
+    let cipher_suites: [u16; 11] = [
+        0x1301, // TLS_AES_128_GCM_SHA256
+        0x1302, // TLS_AES_256_GCM_SHA384
+        0x1303, // TLS_CHACHA20_POLY1305_SHA256
+        0xc02b, // TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
+        0xc02c, // TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
+        0xcca9, // TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
+        0xc02f, // TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
+        0xc030, // TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
+        0xcca8, // TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
+        0x009e, // TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
+        0x00ff, // TLS_EMPTY_RENEGOTIATION_INFO_SCSV
     ];
-    body.extend_from_slice(&(cipher_suites.len() as u16).to_be_bytes());
-    body.extend_from_slice(&cipher_suites);
+    body.extend_from_slice(&((cipher_suites.len() * 2) as u16).to_be_bytes());
+    for suite in cipher_suites {
+        body.extend_from_slice(&suite.to_be_bytes());
+    }
 
     // Compression methods: null only
     body.push(1);
@@ -147,7 +159,7 @@ fn build_client_hello(sni: &str, rng: &SecureRandom) -> Vec<u8> {
     }
 
     // signature_algorithms
-    let sig_algs: [u16; 4] = [0x0804, 0x0805, 0x0403, 0x0503]; // rsa_pss_rsae_sha256/384, ecdsa_secp256r1_sha256, rsa_pkcs1_sha256
+    let sig_algs: [u16; 4] = [0x0804, 0x0805, 0x0403, 0x0503]; // rsa_pss_rsae_sha256/384, ecdsa_secp256r1_sha256, ecdsa_secp384r1_sha384
     exts.extend_from_slice(&0x000du16.to_be_bytes());
     exts.extend_from_slice(&((2 + sig_algs.len() * 2) as u16).to_be_bytes());
     exts.extend_from_slice(&(sig_algs.len() as u16 * 2).to_be_bytes());
@@ -812,8 +824,8 @@ mod tests {
     #[test]
     fn test_encode_tls13_certificate_message_single_cert() {
         let cert = vec![0x30, 0x03, 0x02, 0x01, 0x01];
-        let message = encode_tls13_certificate_message(std::slice::from_ref(&cert))
-            .expect("message");
+        let message =
+            encode_tls13_certificate_message(std::slice::from_ref(&cert)).expect("message");
 
         assert_eq!(message[0], 0x0b);
         assert_eq!(read_u24(&message[1..4]), message.len() - 4);

src/transport/middle_proxy/config_updater.rs

@@ -11,17 +11,19 @@ use tracing::{debug, info, warn};
 
 use crate::config::ProxyConfig;
 use crate::error::Result;
+use crate::transport::UpstreamManager;
 
 use super::MePool;
+use super::http_fetch::https_get;
 use super::rotation::{MeReinitTrigger, enqueue_reinit_trigger};
-use super::secret::download_proxy_secret_with_max_len;
+use super::secret::download_proxy_secret_with_max_len_via_upstream;
 use super::selftest::record_timeskew_sample;
 use std::time::SystemTime;
 
-async fn retry_fetch(url: &str) -> Option<ProxyConfigData> {
+async fn retry_fetch(url: &str, upstream: Option<Arc<UpstreamManager>>) -> Option<ProxyConfigData> {
     let delays = [1u64, 5, 15];
     for (i, d) in delays.iter().enumerate() {
-        match fetch_proxy_config(url).await {
+        match fetch_proxy_config_via_upstream(url, upstream.clone()).await {
             Ok(cfg) => return Some(cfg),
             Err(e) => {
                 if i == delays.len() - 1 {
@@ -95,14 +97,19 @@ pub async fn save_proxy_config_cache(path: &str, raw_text: &str) -> Result<()> {
     Ok(())
 }
 
+#[allow(dead_code)]
 pub async fn fetch_proxy_config_with_raw(url: &str) -> Result<(ProxyConfigData, String)> {
-    let resp = reqwest::get(url).await.map_err(|e| {
-        crate::error::ProxyError::Proxy(format!("fetch_proxy_config GET failed: {e}"))
-    })?;
-    let http_status = resp.status().as_u16();
+    fetch_proxy_config_with_raw_via_upstream(url, None).await
+}
 
-    if let Some(date) = resp.headers().get(reqwest::header::DATE)
-        && let Ok(date_str) = date.to_str()
+pub async fn fetch_proxy_config_with_raw_via_upstream(
+    url: &str,
+    upstream: Option<Arc<UpstreamManager>>,
+) -> Result<(ProxyConfigData, String)> {
+    let resp = https_get(url, upstream).await?;
+    let http_status = resp.status;
+
+    if let Some(date_str) = resp.date_header.as_deref()
         && let Ok(server_time) = httpdate::parse_http_date(date_str)
         && let Ok(skew) = SystemTime::now()
             .duration_since(server_time)
@@ -123,9 +130,7 @@ pub async fn fetch_proxy_config_with_raw(url: &str) -> Result<(ProxyConfigData,
         }
     }
 
-    let text = resp.text().await.map_err(|e| {
-        crate::error::ProxyError::Proxy(format!("fetch_proxy_config read failed: {e}"))
-    })?;
+    let text = String::from_utf8_lossy(&resp.body).into_owned();
     let parsed = parse_proxy_config_text(&text, http_status);
     Ok((parsed, text))
 }
@@ -260,8 +265,16 @@ fn parse_proxy_line(line: &str) -> Option<(i32, IpAddr, u16)> {
     Some((dc, ip, port))
 }
 
+#[allow(dead_code)]
 pub async fn fetch_proxy_config(url: &str) -> Result<ProxyConfigData> {
-    fetch_proxy_config_with_raw(url)
+    fetch_proxy_config_via_upstream(url, None).await
+}
+
+pub async fn fetch_proxy_config_via_upstream(
+    url: &str,
+    upstream: Option<Arc<UpstreamManager>>,
+) -> Result<ProxyConfigData> {
+    fetch_proxy_config_with_raw_via_upstream(url, upstream)
         .await
         .map(|(parsed, _raw)| parsed)
 }
@@ -300,6 +313,7 @@ async fn run_update_cycle(
     state: &mut UpdaterState,
     reinit_tx: &mpsc::Sender<MeReinitTrigger>,
 ) {
+    let upstream = pool.upstream.clone();
     pool.update_runtime_reinit_policy(
         cfg.general.hardswap,
         cfg.general.me_pool_drain_ttl_secs,
@@ -354,7 +368,7 @@ async fn run_update_cycle(
     let mut maps_changed = false;
 
     let mut ready_v4: Option<(ProxyConfigData, u64)> = None;
-    let cfg_v4 = retry_fetch("https://core.telegram.org/getProxyConfig").await;
+    let cfg_v4 = retry_fetch("https://core.telegram.org/getProxyConfig", upstream.clone()).await;
     if let Some(cfg_v4) = cfg_v4
         && snapshot_passes_guards(cfg, &cfg_v4, "getProxyConfig")
     {
@@ -378,7 +392,11 @@ async fn run_update_cycle(
     }
 
     let mut ready_v6: Option<(ProxyConfigData, u64)> = None;
-    let cfg_v6 = retry_fetch("https://core.telegram.org/getProxyConfigV6").await;
+    let cfg_v6 = retry_fetch(
+        "https://core.telegram.org/getProxyConfigV6",
+        upstream.clone(),
+    )
+    .await;
     if let Some(cfg_v6) = cfg_v6
         && snapshot_passes_guards(cfg, &cfg_v6, "getProxyConfigV6")
     {
@@ -456,7 +474,12 @@ async fn run_update_cycle(
     pool.reset_stun_state();
 
     if cfg.general.proxy_secret_rotate_runtime {
-        match download_proxy_secret_with_max_len(cfg.general.proxy_secret_len_max).await {
+        match download_proxy_secret_with_max_len_via_upstream(
+            cfg.general.proxy_secret_len_max,
+            upstream,
+        )
+        .await
+        {
             Ok(secret) => {
                 let secret_hash = hash_secret(&secret);
                 let stable_hits = state.secret.observe(secret_hash);

src/transport/middle_proxy/http_fetch.rs

@@ -0,0 +1,180 @@
+use std::sync::Arc;
+use std::time::Duration;
+
+use http_body_util::{BodyExt, Empty};
+use hyper::header::{CONNECTION, DATE, HOST, USER_AGENT};
+use hyper::{Method, Request};
+use hyper_util::rt::TokioIo;
+use rustls::pki_types::ServerName;
+use tokio::net::TcpStream;
+use tokio::time::timeout;
+use tokio_rustls::TlsConnector;
+use tracing::debug;
+
+use crate::error::{ProxyError, Result};
+use crate::network::dns_overrides::resolve_socket_addr;
+use crate::transport::{UpstreamManager, UpstreamStream};
+
+const HTTP_CONNECT_TIMEOUT: Duration = Duration::from_secs(10);
+const HTTP_REQUEST_TIMEOUT: Duration = Duration::from_secs(15);
+
+pub(crate) struct HttpsGetResponse {
+    pub(crate) status: u16,
+    pub(crate) date_header: Option<String>,
+    pub(crate) body: Vec<u8>,
+}
+
+fn build_tls_client_config() -> Arc<rustls::ClientConfig> {
+    let mut root_store = rustls::RootCertStore::empty();
+    root_store.extend(webpki_roots::TLS_SERVER_ROOTS.iter().cloned());
+    let config = rustls::ClientConfig::builder()
+        .with_root_certificates(root_store)
+        .with_no_client_auth();
+    Arc::new(config)
+}
+
+fn extract_host_port_path(url: &str) -> Result<(String, u16, String)> {
+    let parsed =
+        url::Url::parse(url).map_err(|e| ProxyError::Proxy(format!("invalid URL '{url}': {e}")))?;
+    if parsed.scheme() != "https" {
+        return Err(ProxyError::Proxy(format!(
+            "unsupported URL scheme '{}': only https is supported",
+            parsed.scheme()
+        )));
+    }
+
+    let host = parsed
+        .host_str()
+        .ok_or_else(|| ProxyError::Proxy(format!("URL has no host: {url}")))?
+        .to_string();
+    let port = parsed
+        .port_or_known_default()
+        .ok_or_else(|| ProxyError::Proxy(format!("URL has no known port: {url}")))?;
+
+    let mut path = parsed.path().to_string();
+    if path.is_empty() {
+        path.push('/');
+    }
+    if let Some(query) = parsed.query() {
+        path.push('?');
+        path.push_str(query);
+    }
+
+    Ok((host, port, path))
+}
+
+async fn resolve_target_addr(host: &str, port: u16) -> Result<std::net::SocketAddr> {
+    if let Some(addr) = resolve_socket_addr(host, port) {
+        return Ok(addr);
+    }
+
+    let addrs: Vec<std::net::SocketAddr> = tokio::net::lookup_host((host, port))
+        .await
+        .map_err(|e| ProxyError::Proxy(format!("DNS resolve failed for {host}:{port}: {e}")))?
+        .collect();
+
+    if let Some(addr) = addrs.iter().copied().find(|addr| addr.is_ipv4()) {
+        return Ok(addr);
+    }
+
+    addrs
+        .first()
+        .copied()
+        .ok_or_else(|| ProxyError::Proxy(format!("DNS returned no addresses for {host}:{port}")))
+}
+
+async fn connect_https_transport(
+    host: &str,
+    port: u16,
+    upstream: Option<Arc<UpstreamManager>>,
+) -> Result<UpstreamStream> {
+    if let Some(manager) = upstream {
+        let target = resolve_target_addr(host, port).await?;
+        return timeout(HTTP_CONNECT_TIMEOUT, manager.connect(target, None, None))
+            .await
+            .map_err(|_| ProxyError::Proxy(format!("upstream connect timeout for {host}:{port}")))?
+            .map_err(|e| {
+                ProxyError::Proxy(format!("upstream connect failed for {host}:{port}: {e}"))
+            });
+    }
+
+    if let Some(addr) = resolve_socket_addr(host, port) {
+        let stream = timeout(HTTP_CONNECT_TIMEOUT, TcpStream::connect(addr))
+            .await
+            .map_err(|_| ProxyError::Proxy(format!("connect timeout for {host}:{port}")))?
+            .map_err(|e| ProxyError::Proxy(format!("connect failed for {host}:{port}: {e}")))?;
+        return Ok(UpstreamStream::Tcp(stream));
+    }
+
+    let stream = timeout(HTTP_CONNECT_TIMEOUT, TcpStream::connect((host, port)))
+        .await
+        .map_err(|_| ProxyError::Proxy(format!("connect timeout for {host}:{port}")))?
+        .map_err(|e| ProxyError::Proxy(format!("connect failed for {host}:{port}: {e}")))?;
+    Ok(UpstreamStream::Tcp(stream))
+}
+
+pub(crate) async fn https_get(
+    url: &str,
+    upstream: Option<Arc<UpstreamManager>>,
+) -> Result<HttpsGetResponse> {
+    let (host, port, path_and_query) = extract_host_port_path(url)?;
+    let stream = connect_https_transport(&host, port, upstream).await?;
+
+    let server_name = ServerName::try_from(host.clone())
+        .map_err(|_| ProxyError::Proxy(format!("invalid TLS server name: {host}")))?;
+    let connector = TlsConnector::from(build_tls_client_config());
+    let tls_stream = timeout(HTTP_REQUEST_TIMEOUT, connector.connect(server_name, stream))
+        .await
+        .map_err(|_| ProxyError::Proxy(format!("TLS handshake timeout for {host}:{port}")))?
+        .map_err(|e| ProxyError::Proxy(format!("TLS handshake failed for {host}:{port}: {e}")))?;
+
+    let (mut sender, connection) = hyper::client::conn::http1::handshake(TokioIo::new(tls_stream))
+        .await
+        .map_err(|e| ProxyError::Proxy(format!("HTTP handshake failed for {host}:{port}: {e}")))?;
+
+    tokio::spawn(async move {
+        if let Err(e) = connection.await {
+            debug!(error = %e, "HTTPS fetch connection task failed");
+        }
+    });
+
+    let host_header = if port == 443 {
+        host.clone()
+    } else {
+        format!("{host}:{port}")
+    };
+
+    let request = Request::builder()
+        .method(Method::GET)
+        .uri(path_and_query)
+        .header(HOST, host_header)
+        .header(USER_AGENT, "telemt-middle-proxy/1")
+        .header(CONNECTION, "close")
+        .body(Empty::<bytes::Bytes>::new())
+        .map_err(|e| ProxyError::Proxy(format!("build HTTP request failed for {url}: {e}")))?;
+
+    let response = timeout(HTTP_REQUEST_TIMEOUT, sender.send_request(request))
+        .await
+        .map_err(|_| ProxyError::Proxy(format!("HTTP request timeout for {url}")))?
+        .map_err(|e| ProxyError::Proxy(format!("HTTP request failed for {url}: {e}")))?;
+
+    let status = response.status().as_u16();
+    let date_header = response
+        .headers()
+        .get(DATE)
+        .and_then(|value| value.to_str().ok())
+        .map(|value| value.to_string());
+
+    let body = timeout(HTTP_REQUEST_TIMEOUT, response.into_body().collect())
+        .await
+        .map_err(|_| ProxyError::Proxy(format!("HTTP body read timeout for {url}")))?
+        .map_err(|e| ProxyError::Proxy(format!("HTTP body read failed for {url}: {e}")))?
+        .to_bytes()
+        .to_vec();
+
+    Ok(HttpsGetResponse {
+        status,
+        date_header,
+        body,
+    })
+}

src/transport/middle_proxy/mod.rs

@@ -13,6 +13,7 @@ mod health_integration_tests;
 #[cfg(test)]
 #[path = "tests/health_regression_tests.rs"]
 mod health_regression_tests;
+mod http_fetch;
 mod ping;
 mod pool;
 mod pool_config;
@@ -44,7 +45,8 @@ use bytes::Bytes;
 
 #[allow(unused_imports)]
 pub use config_updater::{
-    ProxyConfigData, fetch_proxy_config, fetch_proxy_config_with_raw, load_proxy_config_cache,
+    ProxyConfigData, fetch_proxy_config, fetch_proxy_config_via_upstream,
+    fetch_proxy_config_with_raw, fetch_proxy_config_with_raw_via_upstream, load_proxy_config_cache,
     me_config_updater, save_proxy_config_cache,
 };
 pub use health::{me_drain_timeout_enforcer, me_health_monitor, me_zombie_writer_watchdog};
@@ -57,7 +59,8 @@ pub use pool::MePool;
 pub use pool_nat::{detect_public_ip, stun_probe};
 pub use registry::ConnRegistry;
 pub use rotation::{MeReinitTrigger, me_reinit_scheduler, me_rotation_task};
-pub use secret::fetch_proxy_secret;
+#[allow(unused_imports)]
+pub use secret::{fetch_proxy_secret, fetch_proxy_secret_with_upstream};
 pub(crate) use selftest::{bnd_snapshot, timeskew_snapshot, upstream_bnd_snapshots};
 pub use wire::proto_flags_for_tag;
 

src/transport/middle_proxy/pool_status.rs

@@ -293,9 +293,7 @@ impl MePool {
                 WriterContour::Draining => "draining",
             };
 
-            if !draining
-                && let Some(dc_idx) = dc
-            {
+            if !draining && let Some(dc_idx) = dc {
                 *live_writers_by_dc_endpoint
                     .entry((dc_idx, endpoint))
                     .or_insert(0) += 1;

src/transport/middle_proxy/secret.rs

@@ -1,9 +1,12 @@
 use httpdate;
+use std::sync::Arc;
 use std::time::SystemTime;
 use tracing::{debug, info, warn};
 
+use super::http_fetch::https_get;
 use super::selftest::record_timeskew_sample;
 use crate::error::{ProxyError, Result};
+use crate::transport::UpstreamManager;
 
 pub const PROXY_SECRET_MIN_LEN: usize = 32;
 
@@ -33,11 +36,21 @@ pub(super) fn validate_proxy_secret_len(data_len: usize, max_len: usize) -> Resu
 }
 
 /// Fetch Telegram proxy-secret binary.
+#[allow(dead_code)]
 pub async fn fetch_proxy_secret(cache_path: Option<&str>, max_len: usize) -> Result<Vec<u8>> {
+    fetch_proxy_secret_with_upstream(cache_path, max_len, None).await
+}
+
+/// Fetch Telegram proxy-secret binary, optionally through upstream routing.
+pub async fn fetch_proxy_secret_with_upstream(
+    cache_path: Option<&str>,
+    max_len: usize,
+    upstream: Option<Arc<UpstreamManager>>,
+) -> Result<Vec<u8>> {
     let cache = cache_path.unwrap_or("proxy-secret");
 
     // 1) Try fresh download first.
-    match download_proxy_secret_with_max_len(max_len).await {
+    match download_proxy_secret_with_max_len_via_upstream(max_len, upstream).await {
         Ok(data) => {
             if let Err(e) = tokio::fs::write(cache, &data).await {
                 warn!(error = %e, "Failed to cache proxy-secret (non-fatal)");
@@ -76,20 +89,25 @@ pub async fn fetch_proxy_secret(cache_path: Option<&str>, max_len: usize) -> Res
     }
 }
 
+#[allow(dead_code)]
 pub async fn download_proxy_secret_with_max_len(max_len: usize) -> Result<Vec<u8>> {
-    let resp = reqwest::get("https://core.telegram.org/getProxySecret")
-        .await
-        .map_err(|e| ProxyError::Proxy(format!("Failed to download proxy-secret: {e}")))?;
+    download_proxy_secret_with_max_len_via_upstream(max_len, None).await
+}
 
-    if !resp.status().is_success() {
+pub async fn download_proxy_secret_with_max_len_via_upstream(
+    max_len: usize,
+    upstream: Option<Arc<UpstreamManager>>,
+) -> Result<Vec<u8>> {
+    let resp = https_get("https://core.telegram.org/getProxySecret", upstream).await?;
+
+    if !(200..=299).contains(&resp.status) {
         return Err(ProxyError::Proxy(format!(
             "proxy-secret download HTTP {}",
-            resp.status()
+            resp.status
         )));
     }
 
-    if let Some(date) = resp.headers().get(reqwest::header::DATE)
-        && let Ok(date_str) = date.to_str()
+    if let Some(date_str) = resp.date_header.as_deref()
         && let Ok(server_time) = httpdate::parse_http_date(date_str)
         && let Ok(skew) = SystemTime::now()
             .duration_since(server_time)
@@ -110,11 +128,7 @@ pub async fn download_proxy_secret_with_max_len(max_len: usize) -> Result<Vec<u8
         }
     }
 
-    let data = resp
-        .bytes()
-        .await
-        .map_err(|e| ProxyError::Proxy(format!("Read proxy-secret body: {e}")))?
-        .to_vec();
+    let data = resp.body;
 
     validate_proxy_secret_len(data.len(), max_len)?;
 

src/transport/pool.rs

@@ -201,7 +201,10 @@ impl ConnectionPool {
     pub async fn close_all(&self) {
         let pools_snapshot: Vec<(SocketAddr, Arc<Mutex<PoolInner>>)> = {
             let pools = self.pools.read();
-            pools.iter().map(|(addr, pool)| (*addr, Arc::clone(pool))).collect()
+            pools
+                .iter()
+                .map(|(addr, pool)| (*addr, Arc::clone(pool)))
+                .collect()
         };
 
         for (addr, pool) in pools_snapshot {