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Fronting fallback

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Flowseal
2026-06-26 18:37:30 +03:00
parent d3d30799a1
commit c8f6f8caf4
4 changed files with 64 additions and 6 deletions
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proxy/tg_ws_proxy.py
+50 -1
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@@ -35,10 +35,12 @@ log = logging.getLogger('tg-mtproto-proxy')
DC_FAIL_COOLDOWN = 30.0
WS_FAIL_TIMEOUT = 2.0
FRONTING_COOLDOWN = 1800.0
LISTENER_CHECK_INTERVAL = 5.0
LISTENER_RESTART_DELAY = 1.0
ws_blacklist: Set[str] = set()
dc_fail_until: Dict[str, float] = {}
fronting_until: float = 0.0
def _try_handshake(handshake: bytes, secret: bytes) -> Optional[Tuple[int, bool, bytes, bytes]]:
@@ -246,6 +248,8 @@ def _build_crypto_ctx(client_dec_prekey_iv, secret, relay_init):
async def _handle_client(reader, writer, secret: bytes):
global fronting_until
stats.connections_total += 1
stats.connections_active += 1
peer = writer.get_extra_info('peername')
@@ -317,17 +321,37 @@ async def _handle_client(reader, writer, secret: bytes):
now = time.monotonic()
fail_until = dc_fail_until.get(dc_key, 0)
ws_timeout = WS_FAIL_TIMEOUT if now < fail_until else 10.0
fronting_active = now < fronting_until
domains = ws_domains(dc, is_media)
target = proxy_config.dc_redirects[dc]
ws = None
ws_failed_redirect = False
ws_timed_out = False
all_redirects = True
ws = await ws_pool.get(dc, is_media, target, domains)
if ws:
log.info("[%s] DC%d%s -> pool hit via %s",
label, dc, media_tag, target)
elif fronting_active:
log.info("[%s] DC%d%s -> fronting / Host %s",
label, dc, media_tag, domains[0])
try:
ws = await RawWebSocket.connect(target, domains[0],
timeout=10.0,
sni="sprinthost.ru")
except Exception as exc:
stats.ws_errors += 1
log.warning("[%s] DC%d%s fronting failed: %s",
label, dc, media_tag, repr(exc))
if ws:
stats.connections_fronting += 1
fronting_until = now + FRONTING_COOLDOWN
ws_pool.fronting_until = fronting_until
else:
fronting_until = 0.0
ws_pool.fronting_until = 0.0
else:
for domain in domains:
url = f'wss://{domain}/apiws'
@@ -351,12 +375,36 @@ async def _handle_client(reader, writer, secret: bytes):
all_redirects = False
log.warning("[%s] DC%d%s WS handshake: %s",
label, dc, media_tag, exc.status_line)
except asyncio.TimeoutError:
stats.ws_errors += 1
ws_timed_out = True
log.warning("[%s] DC%d%s WS connect timed out via %s",
label, dc, media_tag, domain)
except Exception as exc:
stats.ws_errors += 1
all_redirects = False
log.warning("[%s] DC%d%s WS connect failed: %s",
label, dc, media_tag, repr(exc))
# Fronting fallback if WS timed out
if ws is None and ws_timed_out and not fronting_active:
log.info("[%s] DC%d%s -> fronting fallback (Host %s)",
label, dc, media_tag, domains[0])
try:
ws = await RawWebSocket.connect(target, domains[0],
timeout=10.0,
sni="sprinthost.ru")
except Exception as exc:
stats.ws_errors += 1
log.warning("[%s] DC%d%s fronting failed: %s",
label, dc, media_tag, repr(exc))
if ws:
fronting_until = now + FRONTING_COOLDOWN
ws_pool.fronting_until = now + FRONTING_COOLDOWN
stats.connections_fronting += 1
log.info("[%s] DC%d%s fronting OK for %ds",
label, dc, media_tag, int(FRONTING_COOLDOWN))
# WS failed -> fallback
if ws is None:
if ws_failed_redirect and all_redirects:
@@ -431,7 +479,7 @@ _client_tasks: Set[asyncio.Task] = set()
async def _run(stop_event: Optional[asyncio.Event] = None):
global _server_instance, _server_stop_event
global _server_instance, _server_stop_event, fronting_until
_server_stop_event = stop_event
ws_pool.reset()
@@ -439,6 +487,7 @@ async def _run(stop_event: Optional[asyncio.Event] = None):
ws_blacklist.clear()
dc_fail_until.clear()
_client_tasks.clear()
fronting_until = 0.0
if proxy_config.fallback_cfproxy:
user = proxy_config.cfproxy_user_domains