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Fix WebTransport server implementation and add test client

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Server fixes:
- Move H3Connection initialization to ProtocolNegotiated event (matches official aioquic pattern)
- Fix datagram routing to use session_id instead of flow_id
- Add max_datagram_frame_size=65536 to enable QUIC datagrams
- Fix send_datagram() to use keyword arguments
- Add certificate chain handling for Let's Encrypt
- Add no-cache headers to static server

Command-line improvements:
- Move settings from environment variables to argparse
- Add comprehensive CLI arguments with defaults
- Default mode=wt, cert=cert.pem, key=key.pem

Test clients:
- Add test_webtransport_client.py - Python WebTransport client that successfully connects
- Add test_http3.py - Basic HTTP/3 connectivity test

Client updates:
- Auto-configure server URL and certificate hash from /cert-hash.json
- Add ES6 module support

Status:
✅ Python WebTransport client works perfectly
✅ Server properly handles WebTransport connections and datagrams
❌ Chrome fails due to cached QUIC state (QUIC_IETF_GQUIC_ERROR_MISSING)
🔍 Firefox sends packets but fails differently - to be debugged next session

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Vladyslav Doloman
2025-10-19 23:50:08 +00:00
parent ed5cb14b30
commit 1de5a8f3e6
9 changed files with 890 additions and 147 deletions
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13
server/quic_transport.py
View File

@@ -44,7 +44,7 @@ class GameQuicProtocol(QuicConnectionProtocol): # type: ignore[misc]
async def send_datagram(self, data: bytes) -> None:
logging.debug("QUIC send datagram: %d bytes", len(data))
self._quic.send_datagram_frame(data) # type: ignore[attr-defined]
await self._loop.run_in_executor(None, self.transmit) # type: ignore[attr-defined]
self.transmit() # Send queued QUIC packets immediately
class QuicWebTransportServer(DatagramServerTransport):
@@ -65,15 +65,20 @@ class QuicWebTransportServer(DatagramServerTransport):
await proto.send_datagram(data)
async def run(self) -> None:
configuration = QuicConfiguration(is_client=False, alpn_protocols=["h3"])
configuration = QuicConfiguration(
is_client=False,
alpn_protocols=["h3"],
max_datagram_frame_size=65536 # Enable QUIC datagrams
)
configuration.load_cert_chain(self.certfile, self.keyfile)
async def _create_protocol(*args, **kwargs):
def _create_protocol(*args, **kwargs):
return GameQuicProtocol(*args, on_datagram=self._on_datagram, peers=self._peers, **kwargs)
logging.info("QUIC datagram server listening on %s:%d", self.host, self.port)
self._server = await serve(self.host, self.port, configuration=configuration, create_protocol=_create_protocol)
try:
await self._server.wait_closed()
# Wait indefinitely until cancelled (e.g., by KeyboardInterrupt or timeout)
await asyncio.Event().wait()
finally:
self._server.close()

47
server/static_server.py
View File

@@ -3,25 +3,66 @@ from __future__ import annotations
import ssl
import logging
import threading
import json
from http.server import ThreadingHTTPServer, SimpleHTTPRequestHandler
from pathlib import Path
from typing import Tuple
from typing import Tuple, Optional
class _Handler(SimpleHTTPRequestHandler):
# Allow passing a base directory at construction time
# Allow passing a base directory and cert_hash_json at construction time
cert_hash_json: Optional[str] = None
def __init__(self, *args, directory: str | None = None, **kwargs):
super().__init__(*args, directory=directory, **kwargs)
def end_headers(self):
# Add no-cache headers for all static files to force browser to fetch fresh versions
self.send_header('Cache-Control', 'no-cache, no-store, must-revalidate')
self.send_header('Pragma', 'no-cache')
self.send_header('Expires', '0')
super().end_headers()
def start_https_static(host: str, port: int, certfile: str, keyfile: str, docroot: str) -> Tuple[ThreadingHTTPServer, threading.Thread]:
def do_GET(self):
# Intercept /cert-hash.json requests
if self.path == '/cert-hash.json' and self.cert_hash_json:
self.send_response(200)
self.send_header('Content-Type', 'application/json')
self.send_header('Access-Control-Allow-Origin', '*')
self.end_headers()
self.wfile.write(self.cert_hash_json.encode('utf-8'))
else:
# Serve regular static files
super().do_GET()
def start_https_static(
host: str,
port: int,
certfile: str,
keyfile: str,
docroot: str,
cert_hash_json: Optional[str] = None
) -> Tuple[ThreadingHTTPServer, threading.Thread]:
"""Start a simple HTTPS static file server in a background thread.
Args:
host: Host to bind to
port: Port to bind to
certfile: Path to TLS certificate
keyfile: Path to TLS private key
docroot: Document root directory
cert_hash_json: Optional JSON string to serve at /cert-hash.json
Returns the (httpd, thread). Caller is responsible for calling httpd.shutdown()
to stop the server on application exit.
"""
docroot_path = str(Path(docroot).resolve())
# Set class variable for the handler
if cert_hash_json:
_Handler.cert_hash_json = cert_hash_json
def handler(*args, **kwargs):
return _Handler(*args, directory=docroot_path, **kwargs)

132
server/utils.py
View File

@@ -1,5 +1,11 @@
from __future__ import annotations
import hashlib
import re
import tempfile
from typing import List, Optional
from pathlib import Path
def is_newer(a: int, b: int) -> bool:
"""Return True if 16-bit sequence number a is newer than b (wrap-aware).
@@ -8,3 +14,129 @@ def is_newer(a: int, b: int) -> bool:
"""
return ((a - b) & 0xFFFF) < 0x8000
def get_cert_sha256_hash(cert_path: str) -> str:
"""Calculate SHA-256 hash of a certificate file.
Returns the hash as a lowercase hex string (64 characters).
This hash can be used by WebTransport clients for certificate pinning.
"""
try:
from cryptography import x509
from cryptography.hazmat.backends import default_backend
# Read the certificate file
with open(cert_path, 'rb') as f:
cert_data = f.read()
# Parse the certificate
cert = x509.load_pem_x509_certificate(cert_data, default_backend())
# Get the DER-encoded certificate and hash it
cert_der = cert.public_bytes(encoding=x509.Encoding.DER)
hash_bytes = hashlib.sha256(cert_der).digest()
# Return as hex string
return hash_bytes.hex()
except Exception as e:
# Fallback: just hash the file contents (less accurate but works)
with open(cert_path, 'rb') as f:
return hashlib.sha256(f.read()).digest().hex()
def split_pem_certificates(pem_data: str) -> List[str]:
"""Split a PEM file containing multiple certificates into individual certs.
Args:
pem_data: String containing one or more PEM certificates
Returns:
List of individual certificate strings (each includes BEGIN/END markers)
"""
# Match all certificate blocks
cert_pattern = r'(-----BEGIN CERTIFICATE-----.*?-----END CERTIFICATE-----)'
certificates = re.findall(cert_pattern, pem_data, re.DOTALL)
return certificates
def combine_cert_chain(cert_path: str, chain_paths: List[str]) -> str:
"""Combine server cert and chain certs into a single properly-formatted PEM file.
Args:
cert_path: Path to server certificate (may contain full chain)
chain_paths: List of paths to intermediate/root certificates (optional)
Returns:
Path to temporary combined certificate file (caller should clean up)
"""
combined_content = []
# Read server certificate file
with open(cert_path, 'r') as f:
cert_data = f.read().strip()
certs = split_pem_certificates(cert_data)
if chain_paths:
# If chain files provided separately, only use first cert from cert_path
if certs:
combined_content.append(certs[0].strip())
else:
combined_content.append(cert_data)
else:
# No separate chain files - include all certs from cert_path (fullchain case)
if certs:
combined_content.extend([c.strip() for c in certs])
else:
combined_content.append(cert_data)
# Read separate chain certificate files
for chain_path in chain_paths:
with open(chain_path, 'r') as f:
chain_data = f.read().strip()
# Each chain file might contain multiple certs
chain_certs = split_pem_certificates(chain_data)
if chain_certs:
combined_content.extend([c.strip() for c in chain_certs])
else:
combined_content.append(chain_data)
# Write to temporary file with proper formatting
# Each cert should be separated by a newline
temp_file = tempfile.NamedTemporaryFile(mode='w', suffix='.pem', delete=False)
temp_file.write('\n'.join(combined_content))
temp_file.write('\n') # End with newline
temp_file.close()
return temp_file.name
def extract_server_cert(cert_path: str) -> str:
"""Extract just the server certificate from a file that may contain a full chain.
Args:
cert_path: Path to certificate file (may contain chain)
Returns:
Path to temporary file containing only the server certificate
"""
with open(cert_path, 'r') as f:
cert_data = f.read()
# Split into individual certificates
certs = split_pem_certificates(cert_data)
if not certs:
# No certs found, return original path
return cert_path
# First cert is the server cert
server_cert = certs[0].strip()
# Write to temporary file
temp_file = tempfile.NamedTemporaryFile(mode='w', suffix='.pem', delete=False)
temp_file.write(server_cert)
temp_file.write('\n')
temp_file.close()
return temp_file.name

100
server/webtransport_server.py
View File

@@ -2,7 +2,7 @@ from __future__ import annotations
import asyncio
from dataclasses import dataclass
from typing import Awaitable, Callable, Dict, Optional
from typing import Callable, Dict, Optional
from .transport import DatagramServerTransport, OnDatagram, TransportPeer
import logging
@@ -11,7 +11,8 @@ import logging
try:
from aioquic.asyncio import QuicConnectionProtocol, serve
from aioquic.quic.configuration import QuicConfiguration
from aioquic.h3.connection import H3Connection
from aioquic.quic.events import ProtocolNegotiated
from aioquic.h3.connection import H3_ALPN, H3Connection
from aioquic.h3.events import HeadersReceived
# Datagram event names vary by aioquic version; try both
try:
@@ -21,6 +22,8 @@ try:
except Exception: # pragma: no cover - optional dependency not installed
QuicConnectionProtocol = object # type: ignore
QuicConfiguration = object # type: ignore
ProtocolNegotiated = object # type: ignore
H3_ALPN = [] # type: ignore
H3Connection = object # type: ignore
HeadersReceived = object # type: ignore
H3DatagramReceived = object # type: ignore
@@ -38,55 +41,75 @@ class GameWTProtocol(QuicConnectionProtocol): # type: ignore[misc]
super().__init__(*args, **kwargs)
self._on_datagram = on_datagram
self._sessions = sessions
self._http: Optional[H3Connection] = None
self._http: Optional[H3Connection] = None # Created after ProtocolNegotiated
logging.debug("GameWTProtocol initialized")
def http_event_received(self, event) -> None: # type: ignore[override]
logging.debug("HTTP event received: %s", type(event).__name__)
# Headers for CONNECT :protocol = webtransport open a session
if isinstance(event, HeadersReceived):
headers = {k.decode().lower(): v.decode() for k, v in event.headers}
logging.debug("HeadersReceived: %s", headers)
method = headers.get(":method")
protocol = headers.get(":protocol") or headers.get("sec-webtransport-protocol")
logging.debug("Method: %s, Protocol: %s", method, protocol)
if method == "CONNECT" and (protocol == "webtransport"):
# In WebTransport over H3, datagrams use the CONNECT stream id as flow_id
flow_id = event.stream_id # type: ignore[attr-defined]
self._sessions[flow_id] = WTSession(flow_id=flow_id, proto=self)
logging.info("WT CONNECT accepted: flow_id=%s", flow_id)
# In WebTransport over H3, datagrams use the CONNECT stream id as session id
session_id = event.stream_id # type: ignore[attr-defined]
self._sessions[session_id] = WTSession(flow_id=session_id, proto=self)
logging.info("WT CONNECT accepted: session_id=%s", session_id)
# Send 2xx to accept the session
if self._http is not None:
self._http.send_headers(event.stream_id, [(b":status", b"200")])
self.transmit() # Actually send the response to complete handshake
logging.debug("Sent 200 response for WT CONNECT")
else:
logging.warning("Unexpected CONNECT: method=%s, protocol=%s", method, protocol)
elif isinstance(event, H3DatagramReceived): # type: ignore[misc]
# Route datagram to session by flow_id
flow_id = getattr(event, "flow_id", None)
# Route datagram to session by stream_id (WebTransport session ID)
# DatagramReceived has: stream_id (session), data (payload)
session_id = getattr(event, "stream_id", None)
data = getattr(event, "data", None)
if flow_id is None or data is None:
logging.debug("DatagramReceived event: session_id=%s, data_len=%s, has_data=%s",
session_id, len(data) if data else None, data is not None)
if session_id is None or data is None:
logging.warning("Invalid datagram event: session_id=%s, data=%s", session_id, data)
return
sess = self._sessions.get(flow_id)
sess = self._sessions.get(session_id)
if not sess:
logging.warning("No session found for datagram: session_id=%s", session_id)
return
peer = TransportPeer(addr=(self, flow_id))
logging.debug("WT datagram received: flow_id=%s, %d bytes", flow_id, len(data))
peer = TransportPeer(addr=(self, session_id))
logging.info("WT datagram received: session_id=%s, %d bytes", session_id, len(data))
asyncio.ensure_future(self._on_datagram(bytes(data), peer))
def quic_event_received(self, event) -> None: # type: ignore[override]
# Lazily create H3 connection wrapper
if self._http is None and hasattr(self, "_quic"):
try:
self._http = H3Connection(self._quic, enable_webtransport=True) # type: ignore[attr-defined]
except Exception:
self._http = None
event_name = type(event).__name__
logging.debug("QUIC event received: %s", event_name)
# Create H3Connection after ALPN protocol is negotiated
if isinstance(event, ProtocolNegotiated):
if event.alpn_protocol in H3_ALPN:
self._http = H3Connection(self._quic, enable_webtransport=True)
logging.info("H3Connection created with WebTransport support (ALPN: %s)", event.alpn_protocol)
else:
logging.warning("Unexpected ALPN protocol: %s", event.alpn_protocol)
# Pass event to HTTP layer if connection is established
if self._http is not None:
for http_event in self._http.handle_event(event):
self.http_event_received(http_event)
async def send_h3_datagram(self, flow_id: int, data: bytes) -> None:
if self._http is None:
return
try:
if self._http is None:
logging.warning("Cannot send datagram: H3Connection not established")
return
logging.debug("WT send datagram: flow_id=%s, %d bytes", flow_id, len(data))
self._http.send_datagram(flow_id, data)
await self._loop.run_in_executor(None, self.transmit) # type: ignore[attr-defined]
except Exception:
pass
self._http.send_datagram(stream_id=flow_id, data=data)
self.transmit() # Send queued QUIC packets immediately
except Exception as e:
logging.debug("Failed to send datagram: %s", e)
class WebTransportServer(DatagramServerTransport):
@@ -115,15 +138,34 @@ class WebTransportServer(DatagramServerTransport):
await proto.send_h3_datagram(flow_id, data)
async def run(self) -> None:
configuration = QuicConfiguration(is_client=False, alpn_protocols=["h3"])
configuration.load_cert_chain(self.certfile, self.keyfile)
from aioquic.quic.logger import QuicFileLogger
import os
async def _create_protocol(*args, **kwargs):
# Enable QUIC logging if debug level
quic_logger = None
if logging.getLogger().getEffectiveLevel() <= logging.DEBUG:
log_dir = os.path.join(os.getcwd(), "quic_logs")
os.makedirs(log_dir, exist_ok=True)
quic_logger = QuicFileLogger(log_dir)
logging.info("QUIC logging enabled in: %s", log_dir)
configuration = QuicConfiguration(
is_client=False,
alpn_protocols=["h3"], # HTTP/3 with WebTransport support
max_datagram_frame_size=65536, # Enable QUIC datagrams (required for WebTransport)
quic_logger=quic_logger
)
configuration.load_cert_chain(self.certfile, self.keyfile)
logging.debug("QUIC configuration: ALPN=%s, max_datagram_frame_size=%d",
configuration.alpn_protocols, configuration.max_datagram_frame_size or 0)
def _create_protocol(*args, **kwargs):
return GameWTProtocol(*args, on_datagram=self._on_datagram, sessions=self._sessions, **kwargs)
logging.info("WebTransport (H3) server listening on %s:%d", self.host, self.port)
self._server = await serve(self.host, self.port, configuration=configuration, create_protocol=_create_protocol)
try:
await self._server.wait_closed()
# Wait indefinitely until cancelled (e.g., by KeyboardInterrupt or timeout)
await asyncio.Event().wait()
finally:
self._server.close()