Merge 4d83d02a8f into b9b1271f14

Update CONFIG_PARAMS, QUICK_START_GUIDE and FAQ

.github/workflows/release.yml

@@ -5,26 +5,68 @@ on:
     tags:
       - '[0-9]+.[0-9]+.[0-9]+'
   workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Release tag (example: 3.3.15)'
+        required: true
+        type: string
 
 concurrency:
-  group: release-${{ github.ref }}
+  group: release-${{ github.ref_name }}-${{ github.event.inputs.tag || 'auto' }}
   cancel-in-progress: true
 
 permissions:
   contents: read
-  packages: write
 
 env:
   CARGO_TERM_COLOR: always
   BINARY_NAME: telemt
 
 jobs:
+  prepare:
+    name: Prepare
+    runs-on: ubuntu-latest
+
+    outputs:
+      version: ${{ steps.vars.outputs.version }}
+      prerelease: ${{ steps.vars.outputs.prerelease }}
+
+    steps:
+      - name: Resolve version
+        id: vars
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          if [ "${GITHUB_EVENT_NAME}" = "workflow_dispatch" ]; then
+            VERSION="${{ github.event.inputs.tag }}"
+          else
+            VERSION="${GITHUB_REF#refs/tags/}"
+          fi
+
+          VERSION="${VERSION#refs/tags/}"
+
+          if [ -z "${VERSION}" ]; then
+            echo "Release version is empty" >&2
+            exit 1
+          fi
+
+          if [[ "${VERSION}" == *-* ]]; then
+            PRERELEASE=true
+          else
+            PRERELEASE=false
+          fi
+
+          echo "version=${VERSION}" >> "${GITHUB_OUTPUT}"
+          echo "prerelease=${PRERELEASE}" >> "${GITHUB_OUTPUT}"
+
   # ==========================
   # GNU / glibc
   # ==========================
   build-gnu:
-    name: GNU ${{ matrix.target }}
+    name: GNU ${{ matrix.asset }}
     runs-on: ubuntu-latest
+    needs: prepare
 
     container:
       image: rust:slim-bookworm
@@ -35,8 +77,15 @@ jobs:
         include:
           - target: x86_64-unknown-linux-gnu
             asset: telemt-x86_64-linux-gnu
+            cpu: baseline
+
+          - target: x86_64-unknown-linux-gnu
+            asset: telemt-x86_64-v3-linux-gnu
+            cpu: v3
+
           - target: aarch64-unknown-linux-gnu
             asset: telemt-aarch64-linux-gnu
+            cpu: generic
 
     steps:
       - uses: actions/checkout@v4
@@ -62,36 +111,52 @@ jobs:
       - uses: actions/cache@v4
         with:
           path: |
-            ~/.cargo/registry
-            ~/.cargo/git
+            /usr/local/cargo/registry
+            /usr/local/cargo/git
             target
-          key: gnu-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+          key: gnu-${{ matrix.asset }}-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            gnu-${{ matrix.asset }}-
+            gnu-
 
       - name: Build
+        shell: bash
         run: |
+          set -euo pipefail
+
           if [ "${{ matrix.target }}" = "aarch64-unknown-linux-gnu" ]; then
             export CC=aarch64-linux-gnu-gcc
             export CXX=aarch64-linux-gnu-g++
-            export RUSTFLAGS="-C linker=aarch64-linux-gnu-gcc"
+            export RUSTFLAGS="-C linker=aarch64-linux-gnu-gcc -C lto=fat -C panic=abort"
           else
             export CC=clang
             export CXX=clang++
-            export RUSTFLAGS="-C linker=clang -C link-arg=-fuse-ld=lld"
+
+            if [ "${{ matrix.cpu }}" = "v3" ]; then
+              CPU_FLAGS="-C target-cpu=x86-64-v3"
+            else
+              CPU_FLAGS="-C target-cpu=x86-64"
             fi
 
-          cargo build --release --target ${{ matrix.target }}
+            export RUSTFLAGS="-C linker=clang -C link-arg=-fuse-ld=lld -C lto=fat -C panic=abort ${CPU_FLAGS}"
+          fi
+
+          cargo build --release --target ${{ matrix.target }} -j "$(nproc)"
 
       - name: Package
+        shell: bash
         run: |
+          set -euo pipefail
+
           mkdir -p dist
-          cp target/${{ matrix.target }}/release/${{ env.BINARY_NAME }} dist/telemt
+          cp "target/${{ matrix.target }}/release/${{ env.BINARY_NAME }}" dist/telemt
 
           cd dist
-          tar -czf ${{ matrix.asset }}.tar.gz \
+          tar -czf "${{ matrix.asset }}.tar.gz" \
             --owner=0 --group=0 --numeric-owner \
             telemt
 
-          sha256sum ${{ matrix.asset }}.tar.gz > ${{ matrix.asset }}.sha256
+          sha256sum "${{ matrix.asset }}.tar.gz" > "${{ matrix.asset }}.tar.gz.sha256"
 
       - uses: actions/upload-artifact@v4
         with:
@@ -102,8 +167,9 @@ jobs:
   # MUSL
   # ==========================
   build-musl:
-    name: MUSL ${{ matrix.target }}
+    name: MUSL ${{ matrix.asset }}
     runs-on: ubuntu-latest
+    needs: prepare
 
     container:
       image: rust:slim-bookworm
@@ -114,8 +180,15 @@ jobs:
         include:
           - target: x86_64-unknown-linux-musl
             asset: telemt-x86_64-linux-musl
+            cpu: baseline
+
+          - target: x86_64-unknown-linux-musl
+            asset: telemt-x86_64-v3-linux-musl
+            cpu: v3
+
           - target: aarch64-unknown-linux-musl
             asset: telemt-aarch64-linux-musl
+            cpu: generic
 
     steps:
       - uses: actions/checkout@v4
@@ -136,30 +209,29 @@ jobs:
 
       - name: Install aarch64 musl toolchain
         if: matrix.target == 'aarch64-unknown-linux-musl'
+        shell: bash
         run: |
-          set -e
+          set -euo pipefail
 
           TOOLCHAIN_DIR="$HOME/.musl-aarch64"
           ARCHIVE="aarch64-linux-musl-cross.tgz"
-          URL="https://github.com/telemt/telemt/releases/download/toolchains/$ARCHIVE"
+          URL="https://github.com/telemt/telemt/releases/download/toolchains/${ARCHIVE}"
 
-          if [ -x "$TOOLCHAIN_DIR/bin/aarch64-linux-musl-gcc" ]; then
-            echo "✅ MUSL toolchain cached"
+          if [ -x "${TOOLCHAIN_DIR}/bin/aarch64-linux-musl-gcc" ]; then
+            echo "MUSL toolchain cached"
           else
-            echo "⬇️ Downloading MUSL toolchain..."
-  
             curl -fL \
               --retry 5 \
               --retry-delay 3 \
               --connect-timeout 10 \
               --max-time 120 \
-              -o "$ARCHIVE" "$URL"
+              -o "${ARCHIVE}" "${URL}"
 
-            mkdir -p "$TOOLCHAIN_DIR"
-            tar -xzf "$ARCHIVE" --strip-components=1 -C "$TOOLCHAIN_DIR"
+            mkdir -p "${TOOLCHAIN_DIR}"
+            tar -xzf "${ARCHIVE}" --strip-components=1 -C "${TOOLCHAIN_DIR}"
           fi
 
-          echo "$TOOLCHAIN_DIR/bin" >> $GITHUB_PATH
+          echo "${TOOLCHAIN_DIR}/bin" >> "${GITHUB_PATH}"
 
       - name: Add rust target
         run: rustup target add ${{ matrix.target }}
@@ -170,33 +242,49 @@ jobs:
             /usr/local/cargo/registry
             /usr/local/cargo/git
             target
-          key: musl-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+          key: musl-${{ matrix.asset }}-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            musl-${{ matrix.asset }}-
+            musl-
 
       - name: Build
+        shell: bash
         run: |
+          set -euo pipefail
+
           if [ "${{ matrix.target }}" = "aarch64-unknown-linux-musl" ]; then
             export CC=aarch64-linux-musl-gcc
             export CC_aarch64_unknown_linux_musl=aarch64-linux-musl-gcc
-            export RUSTFLAGS="-C target-feature=+crt-static -C linker=aarch64-linux-musl-gcc"
+            export RUSTFLAGS="-C target-feature=+crt-static -C linker=aarch64-linux-musl-gcc -C lto=fat -C panic=abort"
           else
             export CC=musl-gcc
             export CC_x86_64_unknown_linux_musl=musl-gcc
-            export RUSTFLAGS="-C target-feature=+crt-static"
+
+            if [ "${{ matrix.cpu }}" = "v3" ]; then
+              CPU_FLAGS="-C target-cpu=x86-64-v3"
+            else
+              CPU_FLAGS="-C target-cpu=x86-64"
             fi
 
-          cargo build --release --target ${{ matrix.target }}
+            export RUSTFLAGS="-C target-feature=+crt-static -C lto=fat -C panic=abort ${CPU_FLAGS}"
+          fi
+
+          cargo build --release --target ${{ matrix.target }} -j "$(nproc)"
 
       - name: Package
+        shell: bash
         run: |
+          set -euo pipefail
+
           mkdir -p dist
-          cp target/${{ matrix.target }}/release/${{ env.BINARY_NAME }} dist/telemt
+          cp "target/${{ matrix.target }}/release/${{ env.BINARY_NAME }}" dist/telemt
 
           cd dist
-          tar -czf ${{ matrix.asset }}.tar.gz \
+          tar -czf "${{ matrix.asset }}.tar.gz" \
             --owner=0 --group=0 --numeric-owner \
             telemt
 
-          sha256sum ${{ matrix.asset }}.tar.gz > ${{ matrix.asset }}.sha256
+          sha256sum "${{ matrix.asset }}.tar.gz" > "${{ matrix.asset }}.tar.gz.sha256"
 
       - uses: actions/upload-artifact@v4
         with:
@@ -209,7 +297,7 @@ jobs:
   release:
     name: Release
     runs-on: ubuntu-latest
-    needs: [build-gnu, build-musl]
+    needs: [prepare, build-gnu, build-musl]
 
     permissions:
       contents: write
@@ -219,25 +307,30 @@ jobs:
         with:
           path: artifacts
 
-      - name: Flatten
+      - name: Flatten artifacts
+        shell: bash
         run: |
-          mkdir dist
+          set -euo pipefail
+          mkdir -p dist
           find artifacts -type f -exec cp {} dist/ \;
 
-      - name: Create Release
+      - name: Create GitHub Release
         uses: softprops/action-gh-release@v2
         with:
+          tag_name: ${{ needs.prepare.outputs.version }}
+          target_commitish: ${{ github.sha }}
           files: dist/*
           generate_release_notes: true
-          prerelease: ${{ contains(github.ref, '-') }}
+          prerelease: ${{ needs.prepare.outputs.prerelease == 'true' }}
+          overwrite_files: true
 
   # ==========================
-# Docker (FROM RELEASE)
+  # Docker
   # ==========================
   docker:
-    name: Docker (from release)
+    name: Docker
     runs-on: ubuntu-latest
-    needs: release
+    needs: [prepare, release]
 
     permissions:
       contents: read
@@ -246,28 +339,8 @@ jobs:
     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
@@ -276,14 +349,57 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Probe release assets
+        shell: bash
+        env:
+          VERSION: ${{ needs.prepare.outputs.version }}
+        run: |
+          set -euo pipefail
+
+          for asset in \
+            telemt-x86_64-linux-musl.tar.gz \
+            telemt-x86_64-linux-musl.tar.gz.sha256 \
+            telemt-aarch64-linux-musl.tar.gz \
+            telemt-aarch64-linux-musl.tar.gz.sha256
+          do
+            curl -fsIL \
+              --retry 10 \
+              --retry-delay 3 \
+              "https://github.com/${GITHUB_REPOSITORY}/releases/download/${VERSION}/${asset}" \
+              > /dev/null
+          done
+
+      - name: Compute image tags
+        id: meta
+        shell: bash
+        env:
+          VERSION: ${{ needs.prepare.outputs.version }}
+        run: |
+          set -euo pipefail
+
+          IMAGE="$(echo "ghcr.io/${GITHUB_REPOSITORY}" | tr '[:upper:]' '[:lower:]')"
+          TAGS="${IMAGE}:${VERSION}"
+
+          if [[ "${VERSION}" != *-* ]]; then
+            TAGS="${TAGS}"$'\n'"${IMAGE}:latest"
+          fi
+
+          {
+            echo "tags<<EOF"
+            printf '%s\n' "${TAGS}"
+            echo "EOF"
+          } >> "${GITHUB_OUTPUT}"
+
       - name: Build & Push
         uses: docker/build-push-action@v6
         with:
           context: .
           push: true
+          pull: true
           platforms: linux/amd64,linux/arm64
-          tags: |
-            ghcr.io/${{ github.repository }}:${{ steps.vars.outputs.VERSION }}
-            ghcr.io/${{ github.repository }}:latest
+          tags: ${{ steps.meta.outputs.tags }}
           build-args: |
-            BINARY=dist/telemt
+            TELEMT_REPOSITORY=${{ github.repository }}
+            TELEMT_VERSION=${{ needs.prepare.outputs.version }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.github/workflows/test.yml

@@ -54,14 +54,20 @@ jobs:
         uses: actions/cache@v4
         with:
           path: |
+            ~/.cargo/bin
             ~/.cargo/registry
             ~/.cargo/git
             target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          key: ${{ runner.os }}-cargo-nextest-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
+            ${{ runner.os }}-cargo-nextest-
             ${{ runner.os }}-cargo-
 
-      - run: cargo test --verbose
+      - name: Install cargo-nextest
+        run: cargo install --locked cargo-nextest || true
+
+      - name: Run tests with nextest
+        run: cargo nextest run -j "$(nproc)"
 
 # ==========================
 # Clippy
@@ -88,11 +94,13 @@ jobs:
             ~/.cargo/registry
             ~/.cargo/git
             target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          key: ${{ runner.os }}-cargo-clippy-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
+            ${{ runner.os }}-cargo-clippy-
             ${{ runner.os }}-cargo-
 
-      - run: cargo clippy -- --cap-lints warn
+      - name: Run clippy
+        run: cargo clippy -j "$(nproc)" -- --cap-lints warn
 
 # ==========================
 # Udeps
@@ -108,20 +116,24 @@ jobs:
       - uses: actions/checkout@v4
 
       - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rust-src
 
       - name: Cache cargo
         uses: actions/cache@v4
         with:
           path: |
+            ~/.cargo/bin
             ~/.cargo/registry
             ~/.cargo/git
             target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          key: ${{ runner.os }}-cargo-udeps-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: |
+            ${{ runner.os }}-cargo-udeps-
             ${{ runner.os }}-cargo-
 
       - name: Install cargo-udeps
-        run: cargo install cargo-udeps || true
+        run: cargo install --locked cargo-udeps || true
 
-      # тоже не валит билд
-      - run: cargo udeps || true
+      - name: Run udeps
+        run: cargo udeps -j "$(nproc)" || true

Cargo.lock

@@ -2793,7 +2793,7 @@ checksum = "7b2093cf4c8eb1e67749a6762251bc9cd836b6fc171623bd0a9d324d37af2417"
 
 [[package]]
 name = "telemt"
-version = "3.3.30"
+version = "3.3.31"
 dependencies = [
  "aes",
  "anyhow",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "telemt"
-version = "3.3.30"
+version = "3.3.31"
 edition = "2024"
 
 [features]
@@ -83,4 +83,6 @@ name = "crypto_bench"
 harness = false
 
 [profile.release]
-lto = "thin"
+lto = "fat"
+codegen-units = 1
+

Dockerfile

@@ -1,47 +1,74 @@
 # syntax=docker/dockerfile:1
 
-ARG BINARY
+ARG TELEMT_REPOSITORY=telemt/telemt
+ARG TELEMT_VERSION=latest
 
 # ==========================
-# Stage: minimal
+# Minimal Image
 # ==========================
 FROM debian:12-slim AS minimal
 
-RUN apt-get update && apt-get install -y --no-install-recommends \
+ARG TARGETARCH
+ARG TELEMT_REPOSITORY
+ARG TELEMT_VERSION
+
+RUN set -eux; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
         binutils \
-    curl \
         ca-certificates \
-    && rm -rf /var/lib/apt/lists/* \
-    \
-    && curl -fL \
+        curl \
+        tar; \
+    rm -rf /var/lib/apt/lists/*
+
+RUN set -eux; \
+    case "${TARGETARCH}" in \
+        amd64) ASSET="telemt-x86_64-linux-musl.tar.gz" ;; \
+        arm64) ASSET="telemt-aarch64-linux-musl.tar.gz" ;; \
+        *) echo "Unsupported TARGETARCH: ${TARGETARCH}" >&2; exit 1 ;; \
+    esac; \
+    VERSION="${TELEMT_VERSION#refs/tags/}"; \
+    if [ -z "${VERSION}" ] || [ "${VERSION}" = "latest" ]; then \
+        BASE_URL="https://github.com/${TELEMT_REPOSITORY}/releases/latest/download"; \
+    else \
+        BASE_URL="https://github.com/${TELEMT_REPOSITORY}/releases/download/${VERSION}"; \
+    fi; \
+    curl -fL \
         --retry 5 \
         --retry-delay 3 \
         --connect-timeout 10 \
         --max-time 120 \
-        -o /tmp/upx.tar.xz \
-        https://github.com/telemt/telemt/releases/download/toolchains/upx-amd64_linux.tar.xz \
-    && tar -xf /tmp/upx.tar.xz -C /tmp \
-    && mv /tmp/upx*/upx /usr/local/bin/upx \
-    && chmod +x /usr/local/bin/upx \
-    && rm -rf /tmp/upx*
-
-COPY ${BINARY} /telemt
-
-RUN strip /telemt || true
-RUN upx --best --lzma /telemt || true
+        -o "/tmp/${ASSET}" \
+        "${BASE_URL}/${ASSET}"; \
+    curl -fL \
+        --retry 5 \
+        --retry-delay 3 \
+        --connect-timeout 10 \
+        --max-time 120 \
+        -o "/tmp/${ASSET}.sha256" \
+        "${BASE_URL}/${ASSET}.sha256"; \
+    cd /tmp; \
+    sha256sum -c "${ASSET}.sha256"; \
+    tar -xzf "${ASSET}" -C /tmp; \
+    test -f /tmp/telemt; \
+    install -m 0755 /tmp/telemt /telemt; \
+    strip --strip-unneeded /telemt || true; \
+    rm -f "/tmp/${ASSET}" "/tmp/${ASSET}.sha256" /tmp/telemt
 
 # ==========================
-# Debug image
+# Debug Image
 # ==========================
 FROM debian:12-slim AS debug
 
-RUN apt-get update && apt-get install -y --no-install-recommends \
+RUN set -eux; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
         ca-certificates \
         tzdata \
         curl \
         iproute2 \
-    busybox \
-    && rm -rf /var/lib/apt/lists/*
+        busybox; \
+    rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 
@@ -54,7 +81,7 @@ ENTRYPOINT ["/app/telemt"]
 CMD ["config.toml"]
 
 # ==========================
-# Production (REAL distroless)
+# Production Distroless on MUSL
 # ==========================
 FROM gcr.io/distroless/static-debian12 AS prod
 

docs/CONFIG_PARAMS.en.md

@@ -50,6 +50,8 @@ This document lists all configuration keys accepted by `config.toml`.
 | me_d2c_flush_batch_max_bytes | `usize` | `131072` | `4096..=2_097_152`. | Max ME->client payload bytes coalesced before flush. |
 | me_d2c_flush_batch_max_delay_us | `u64` | `500` | `0..=5000`. | Max microsecond wait for coalescing more ME->client frames (`0` disables timed coalescing). |
 | me_d2c_ack_flush_immediate | `bool` | `true` | — | Flushes client writer immediately after quick-ack write. |
+| me_quota_soft_overshoot_bytes | `u64` | `65536` | `0..=16_777_216`. | Extra per-route quota allowance (bytes) tolerated before writer-side quota enforcement drops route data. |
+| me_d2c_frame_buf_shrink_threshold_bytes | `usize` | `262144` | `4096..=16_777_216`. | Threshold for shrinking oversized ME->client frame-aggregation buffers after flush. |
 | direct_relay_copy_buf_c2s_bytes | `usize` | `65536` | `4096..=1_048_576`. | Copy buffer size for client->DC direction in direct relay. |
 | direct_relay_copy_buf_s2c_bytes | `usize` | `262144` | `8192..=2_097_152`. | Copy buffer size for DC->client direction in direct relay. |
 | crypto_pending_buffer | `usize` | `262144` | — | Max pending ciphertext buffer per client writer (bytes). |
@@ -243,6 +245,10 @@ Note: When `server.proxy_protocol` is enabled, incoming PROXY protocol headers a
 | Parameter | Type | Default | Constraints / validation | Description |
 |---|---|---|---|---|
 | client_handshake | `u64` | `30` | — | Client handshake timeout. |
+| relay_idle_policy_v2_enabled | `bool` | `true` | — | Enables soft/hard middle-relay client idle policy. |
+| relay_client_idle_soft_secs | `u64` | `120` | Must be `> 0`; must be `<= relay_client_idle_hard_secs`. | Soft idle threshold for middle-relay client uplink inactivity (seconds). |
+| relay_client_idle_hard_secs | `u64` | `360` | Must be `> 0`; must be `>= relay_client_idle_soft_secs`. | Hard idle threshold for middle-relay client uplink inactivity (seconds). |
+| relay_idle_grace_after_downstream_activity_secs | `u64` | `30` | Must be `<= relay_client_idle_hard_secs`. | Extra hard-idle grace after recent downstream activity (seconds). |
 | tg_connect | `u64` | `10` | — | Upstream Telegram connect timeout. |
 | client_keepalive | `u64` | `15` | — | Client keepalive timeout. |
 | client_ack | `u64` | `90` | — | Client ACK timeout. |
@@ -255,6 +261,9 @@ Note: When `server.proxy_protocol` is enabled, incoming PROXY protocol headers a
 |---|---|---|---|---|
 | tls_domain | `String` | `"petrovich.ru"` | — | Primary TLS domain used in fake TLS handshake profile. |
 | tls_domains | `String[]` | `[]` | — | Additional TLS domains for generating multiple links. |
+| unknown_sni_action | `"drop" \| "mask"` | `"drop"` | — | Action for TLS ClientHello with unknown/non-configured SNI. |
+| tls_fetch_scope | `String` | `""` | Value is trimmed during load; empty keeps default upstream routing behavior. | Upstream scope tag used for TLS-front metadata fetches. |
+| tls_fetch | `Table` | built-in defaults | See `[censorship.tls_fetch]` section below. | TLS-front metadata fetch strategy settings. |
 | mask | `bool` | `true` | — | Enables masking/fronting relay mode. |
 | mask_host | `String \| null` | `null` | — | Upstream mask host for TLS fronting relay. |
 | mask_port | `u16` | `443` | — | Upstream mask port for TLS fronting relay. |
@@ -280,6 +289,18 @@ Note: When `server.proxy_protocol` is enabled, incoming PROXY protocol headers a
 | mask_timing_normalization_floor_ms | `u64` | `0` | Must be `> 0` when timing normalization is enabled; must be `<= ceiling`. | Lower bound (ms) for masking outcome normalization target. |
 | mask_timing_normalization_ceiling_ms | `u64` | `0` | Must be `>= floor`; must be `<= 60000`. | Upper bound (ms) for masking outcome normalization target. |
 
+## [censorship.tls_fetch]
+
+| Parameter | Type | Default | Constraints / validation | Description |
+|---|---|---|---|---|
+| profiles | `("modern_chrome_like" \| "modern_firefox_like" \| "compat_tls12" \| "legacy_minimal")[]` | `["modern_chrome_like", "modern_firefox_like", "compat_tls12", "legacy_minimal"]` | Empty list falls back to defaults; values are deduplicated preserving order. | Ordered ClientHello profile fallback chain for TLS-front metadata fetch. |
+| strict_route | `bool` | `true` | — | Fails closed on upstream-route connect errors instead of falling back to direct TCP when route is configured. |
+| attempt_timeout_ms | `u64` | `5000` | Must be `> 0`. | Timeout budget per one TLS-fetch profile attempt (ms). |
+| total_budget_ms | `u64` | `15000` | Must be `> 0`. | Total wall-clock budget across all TLS-fetch attempts (ms). |
+| grease_enabled | `bool` | `false` | — | Enables GREASE-style random values in selected ClientHello extensions for fetch traffic. |
+| deterministic | `bool` | `false` | — | Enables deterministic ClientHello randomness for debugging/tests. |
+| profile_cache_ttl_secs | `u64` | `600` | `0` disables cache. | TTL for winner-profile cache entries used by TLS fetch path. |
+
 ### Shape-channel hardening notes (`[censorship]`)
 
 These parameters are designed to reduce one specific fingerprint source during masking: the exact number of bytes sent from proxy to `mask_host` for invalid or probing traffic.

docs/FAQ.en.md

@@ -63,9 +63,12 @@ user3 = "00000000000000000000000000000003"
 curl -s http://127.0.0.1:9091/v1/users | jq
 ```
 
+## "Unknown TLS SNI" Error
+You probably updated tls_domain, but users are still connecting via old links with the previous domain.
+
 ## How to view metrics
 
-1. Open the config `nano /etc/telemt.toml`
+1. Open the config `nano /etc/telemt/telemt.toml`
 2. Add the following parameters
 ```toml
 [server]

docs/FAQ.ru.md

@@ -64,9 +64,12 @@ user3 = "00000000000000000000000000000003"
 curl -s http://127.0.0.1:9091/v1/users | jq
 ```
 
+## Ошибка "Unknown TLS SNI"
+Возможно, вы обновили tls_domain, но пользователи всё ещё пытаются подключаться по старым ссылкам с прежним доменом.
+
 ## Как посмотреть метрики
 
-1. Открыть конфиг `nano /etc/telemt.toml`
+1. Открыть конфиг `nano /etc/telemt/telemt.toml`
 2. Добавить следующие параметры
 ```toml
 [server]

docs/QUICK_START_GUIDE.en.md

@@ -27,12 +27,12 @@ chmod +x /bin/telemt
 
 **0. Check port and generate secrets**
 
-The port you have selected for use should be MISSING from the list, when:
+The port you have selected for use should not be in the list:
 ```bash
 netstat -lnp
 ```
 
-Generate 16 bytes/32 characters HEX with OpenSSL or another way:
+Generate 16 bytes/32 characters in HEX format with OpenSSL or another way:
 ```bash
 openssl rand -hex 16
 ```
@@ -50,7 +50,7 @@ Save the obtained result somewhere. You will need it later!
 
 **1. Place your config to /etc/telemt/telemt.toml**
 
-Create config directory:
+Create the config directory:
 ```bash
 mkdir /etc/telemt
 ```
@@ -59,7 +59,7 @@ Open nano
 ```bash
 nano /etc/telemt/telemt.toml
 ```
-paste your config
+Insert your configuration:
 
 ```toml
 # === General Settings ===
@@ -94,7 +94,8 @@ then Ctrl+S -> Ctrl+X to save
 
 > [!WARNING]
 > Replace the value of the hello parameter with the value you obtained in step 0.  
-> Replace the value of the tls_domain parameter with another website.
+> Additionally, change the value of the tls_domain parameter to a different website.
+> Changing the tls_domain parameter will break all links that use the old domain!
 
 ---
 
@@ -105,14 +106,14 @@ useradd -d /opt/telemt -m -r -U telemt
 chown -R telemt:telemt /etc/telemt
 ```
 
-**3. Create service on /etc/systemd/system/telemt.service**
+**3. Create service in /etc/systemd/system/telemt.service**
 
 Open nano
 ```bash
 nano /etc/systemd/system/telemt.service
 ```
 
-paste this Systemd Module
+Insert this Systemd module:
 ```bash
 [Unit]
 Description=Telemt
@@ -147,13 +148,16 @@ systemctl daemon-reload
 
 **6.** For automatic startup at system boot, enter `systemctl enable telemt`
 
-**7.** To get the link(s), enter
+**7.** To get the link(s), enter:
 ```bash
 curl -s http://127.0.0.1:9091/v1/users | jq
 ```
 
 > Any number of people can use one link.
 
+> [!WARNING]
+> Only the command from step 7 can provide a working link. Do not try to create it yourself or copy it from anywhere if you are not sure what you are doing!
+
 ---
 
 # Telemt via Docker Compose

docs/QUICK_START_GUIDE.ru.md

@@ -95,6 +95,7 @@ hello = "00000000000000000000000000000000"
 > [!WARNING]
 > Замените значение параметра hello на значение, которое вы получили в пункте 0.  
 > Так же замените значение параметра tls_domain на другой сайт.
+> Изменение параметра tls_domain сделает нерабочими все ссылки, использующие старый домен!
 
 ---
 

src/config/load.rs

@@ -346,6 +346,12 @@ impl ProxyConfig {
             ));
         }
 
+        if config.timeouts.tg_connect == 0 {
+            return Err(ProxyError::Config(
+                "timeouts.tg_connect must be > 0".to_string(),
+            ));
+        }
+
         if config.general.upstream_unhealthy_fail_threshold == 0 {
             return Err(ProxyError::Config(
                 "general.upstream_unhealthy_fail_threshold must be > 0".to_string(),
@@ -1905,6 +1911,26 @@ mod tests {
         let _ = std::fs::remove_file(path);
     }
 
+    #[test]
+    fn tg_connect_zero_is_rejected() {
+        let toml = r#"
+            [timeouts]
+            tg_connect = 0
+
+            [censorship]
+            tls_domain = "example.com"
+
+            [access.users]
+            user = "00000000000000000000000000000000"
+        "#;
+        let dir = std::env::temp_dir();
+        let path = dir.join("telemt_tg_connect_zero_test.toml");
+        std::fs::write(&path, toml).unwrap();
+        let err = ProxyConfig::load(&path).unwrap_err().to_string();
+        assert!(err.contains("timeouts.tg_connect must be > 0"));
+        let _ = std::fs::remove_file(path);
+    }
+
     #[test]
     fn rpc_proxy_req_every_out_of_range_is_rejected() {
         let toml = r#"

src/maestro/mod.rs

@@ -225,6 +225,7 @@ pub async fn run() -> std::result::Result<(), Box<dyn std::error::Error>> {
         config.general.upstream_connect_retry_attempts,
         config.general.upstream_connect_retry_backoff_ms,
         config.general.upstream_connect_budget_ms,
+        config.timeouts.tg_connect,
         config.general.upstream_unhealthy_fail_threshold,
         config.general.upstream_connect_failfast_hard_errors,
         stats.clone(),

src/proxy/handshake.rs

@@ -13,7 +13,7 @@ use std::sync::Arc;
 use std::sync::{Mutex, OnceLock};
 use std::time::{Duration, Instant};
 use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt};
-use tracing::{debug, trace, warn};
+use tracing::{debug, info, trace, warn};
 use zeroize::{Zeroize, Zeroizing};
 
 use crate::config::{ProxyConfig, UnknownSniAction};
@@ -28,6 +28,8 @@ use rand::RngExt;
 
 const ACCESS_SECRET_BYTES: usize = 16;
 static INVALID_SECRET_WARNED: OnceLock<Mutex<HashSet<(String, String)>>> = OnceLock::new();
+const UNKNOWN_SNI_WARN_COOLDOWN_SECS: u64 = 5;
+static UNKNOWN_SNI_WARN_NEXT_ALLOWED: OnceLock<Mutex<Option<Instant>>> = OnceLock::new();
 #[cfg(test)]
 const WARNED_SECRET_MAX_ENTRIES: usize = 64;
 #[cfg(not(test))]
@@ -86,6 +88,24 @@ fn auth_probe_saturation_state_lock()
         .unwrap_or_else(|poisoned| poisoned.into_inner())
 }
 
+fn unknown_sni_warn_state_lock() -> std::sync::MutexGuard<'static, Option<Instant>> {
+    UNKNOWN_SNI_WARN_NEXT_ALLOWED
+        .get_or_init(|| Mutex::new(None))
+        .lock()
+        .unwrap_or_else(|poisoned| poisoned.into_inner())
+}
+
+fn should_emit_unknown_sni_warn(now: Instant) -> bool {
+    let mut guard = unknown_sni_warn_state_lock();
+    if let Some(next_allowed) = *guard
+        && now < next_allowed
+    {
+        return false;
+    }
+    *guard = Some(now + Duration::from_secs(UNKNOWN_SNI_WARN_COOLDOWN_SECS));
+    true
+}
+
 fn normalize_auth_probe_ip(peer_ip: IpAddr) -> IpAddr {
     match peer_ip {
         IpAddr::V4(ip) => IpAddr::V4(ip),
@@ -412,6 +432,25 @@ fn auth_probe_test_lock() -> &'static Mutex<()> {
     TEST_LOCK.get_or_init(|| Mutex::new(()))
 }
 
+#[cfg(test)]
+fn unknown_sni_warn_test_lock() -> &'static Mutex<()> {
+    static TEST_LOCK: OnceLock<Mutex<()>> = OnceLock::new();
+    TEST_LOCK.get_or_init(|| Mutex::new(()))
+}
+
+#[cfg(test)]
+fn clear_unknown_sni_warn_state_for_testing() {
+    if UNKNOWN_SNI_WARN_NEXT_ALLOWED.get().is_some() {
+        let mut guard = unknown_sni_warn_state_lock();
+        *guard = None;
+    }
+}
+
+#[cfg(test)]
+fn should_emit_unknown_sni_warn_for_testing(now: Instant) -> bool {
+    should_emit_unknown_sni_warn(now)
+}
+
 #[cfg(test)]
 fn clear_warned_secrets_for_testing() {
     if let Some(warned) = INVALID_SECRET_WARNED.get()
@@ -658,12 +697,25 @@ where
     if client_sni.is_some() && matched_tls_domain.is_none() && preferred_user_hint.is_none() {
         auth_probe_record_failure(peer.ip(), Instant::now());
         maybe_apply_server_hello_delay(config).await;
-        debug!(
+        let sni = client_sni.as_deref().unwrap_or_default();
+        let log_now = Instant::now();
+        if should_emit_unknown_sni_warn(log_now) {
+            warn!(
                 peer = %peer,
-            sni = ?client_sni,
-            action = ?config.censorship.unknown_sni_action,
+                sni = %sni,
+                unknown_sni = true,
+                unknown_sni_action = ?config.censorship.unknown_sni_action,
                 "TLS handshake rejected by unknown SNI policy"
             );
+        } else {
+            info!(
+                peer = %peer,
+                sni = %sni,
+                unknown_sni = true,
+                unknown_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 },

src/proxy/tests/handshake_security_tests.rs

@@ -1643,6 +1643,32 @@ fn auth_probe_capacity_fresh_full_map_still_tracks_newcomer_with_bounded_evictio
     );
 }
 
+#[test]
+fn unknown_sni_warn_cooldown_first_event_is_warn_and_repeated_events_are_info_until_window_expires()
+{
+    let _guard = unknown_sni_warn_test_lock()
+        .lock()
+        .unwrap_or_else(|poisoned| poisoned.into_inner());
+    clear_unknown_sni_warn_state_for_testing();
+
+    let now = Instant::now();
+
+    assert!(
+        should_emit_unknown_sni_warn_for_testing(now),
+        "first unknown SNI event must be eligible for WARN emission"
+    );
+    assert!(
+        !should_emit_unknown_sni_warn_for_testing(now + Duration::from_secs(1)),
+        "events inside cooldown window must be demoted from WARN to INFO"
+    );
+    assert!(
+        should_emit_unknown_sni_warn_for_testing(
+            now + Duration::from_secs(UNKNOWN_SNI_WARN_COOLDOWN_SECS)
+        ),
+        "once cooldown expires, next unknown SNI event must be WARN-eligible again"
+    );
+}
+
 #[test]
 fn stress_auth_probe_full_map_churn_keeps_bound_and_tracks_newcomers() {
     let _guard = auth_probe_test_lock()

src/transport/upstream.rs

@@ -34,8 +34,6 @@ const NUM_DCS: usize = 5;
 
 /// Timeout for individual DC ping attempt
 const DC_PING_TIMEOUT_SECS: u64 = 5;
-/// Timeout for direct TG DC TCP connect readiness.
-const DIRECT_CONNECT_TIMEOUT_SECS: u64 = 10;
 /// Interval between upstream health-check cycles.
 const HEALTH_CHECK_INTERVAL_SECS: u64 = 30;
 /// Timeout for a single health-check connect attempt.
@@ -319,6 +317,8 @@ pub struct UpstreamManager {
     connect_retry_attempts: u32,
     connect_retry_backoff: Duration,
     connect_budget: Duration,
+    /// Per-attempt TCP connect timeout to Telegram DC (`[timeouts] tg_connect`, seconds).
+    tg_connect_timeout_secs: u64,
     unhealthy_fail_threshold: u32,
     connect_failfast_hard_errors: bool,
     no_upstreams_warn_epoch_ms: Arc<AtomicU64>,
@@ -332,6 +332,7 @@ impl UpstreamManager {
         connect_retry_attempts: u32,
         connect_retry_backoff_ms: u64,
         connect_budget_ms: u64,
+        tg_connect_timeout_secs: u64,
         unhealthy_fail_threshold: u32,
         connect_failfast_hard_errors: bool,
         stats: Arc<Stats>,
@@ -347,6 +348,7 @@ impl UpstreamManager {
             connect_retry_attempts: connect_retry_attempts.max(1),
             connect_retry_backoff: Duration::from_millis(connect_retry_backoff_ms),
             connect_budget: Duration::from_millis(connect_budget_ms.max(1)),
+            tg_connect_timeout_secs: tg_connect_timeout_secs.max(1),
             unhealthy_fail_threshold: unhealthy_fail_threshold.max(1),
             connect_failfast_hard_errors,
             no_upstreams_warn_epoch_ms: Arc::new(AtomicU64::new(0)),
@@ -797,8 +799,8 @@ impl UpstreamManager {
                 break;
             }
             let remaining_budget = self.connect_budget.saturating_sub(elapsed);
-            let attempt_timeout =
-                Duration::from_secs(DIRECT_CONNECT_TIMEOUT_SECS).min(remaining_budget);
+            let attempt_timeout = Duration::from_secs(self.tg_connect_timeout_secs)
+                .min(remaining_budget);
             if attempt_timeout.is_zero() {
                 last_error = Some(ProxyError::ConnectionTimeout {
                     addr: target.to_string(),
@@ -1901,6 +1903,7 @@ mod tests {
             1,
             100,
             1000,
+            10,
             1,
             false,
             Arc::new(Stats::new()),