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This patch adds two major proxy capabilities to curl (ngtcp2 QUIC):
- HTTP/3 Proxy CONNECT: Tunnel HTTP/1.1 or HTTP/2 traffic through an
HTTPS proxy that speaks HTTP/3 (QUIC) using the standard CONNECT
method over an HTTP/3 connection.
- MASQUE CONNECT-UDP: Tunnel HTTP/3 (QUIC) traffic through an HTTP
proxy (speaking HTTP/1.1, HTTP/2, or HTTP/3) using the extended
CONNECT method with the CONNECT-UDP protocol (RFC9297 & RFC9298).
Public API additions:
- `CURLPROXY_HTTPS3`: new proxy type constant for HTTP/3 proxy
- `--proxy-http3`: new CLI flag to negotiate HTTP/3 with HTTPS proxy
The implementation adds two new filters:
- `H3-PROXY` - enables negotiating HTTP/3 (QUIC) to the proxy and
running CONNECT/CONNECT-UDP through that proxy transport.
- `CAPSULE` - dedicated filter inserted between QUIC transport and
HTTP-PROXY to handle datagram capsule encapsulation/decapsulation.
Here is how the curl filter chaining looks in different scenarios:
- HTTP/3 Proxy CONNECT (tunneling TCP protocols over QUIC proxy):
conn -> HTTP/1.1 or HTTP/2 -> SSL -> HTTP-PROXY ->
H3-PROXY -> HAPPY-EYEBALLS -> UDP
- MASQUE CONNECT-UDP (tunneling QUIC over any proxy):
conn -> HTTP/3 -> CAPSULE -> HTTP-PROXY -> H3-PROXY ->
HAPPY-EYEBALLS -> UDP
conn -> HTTP/3 -> CAPSULE -> HTTP-PROXY -> H1-PROXY or H2-PROXY ->
SSL -> HAPPY-EYEBALLS -> TCP
- Both features currently require the ngtcp2 QUIC backend.
- Both features are experimental (disabled by default). Enable with
`--enable-proxy-http3`(autotools) or `-DUSE_PROXY_HTTP3=ON`(CMake).
Tests:
- tests/unit/unit3400.c: Unit tests for capsule protocol encode/decode
- tests/http/test_60_h3_proxy.py: Comprehensive pytest integration suite
- tests/http/testenv/h2o.py: Managing h2o instances with HTTP/1.1, HTTP/2,
and HTTP/3 (QUIC) listeners, proxy.connect and proxy.connect-udp enabled.
References:
RFC 9297 - HTTP Datagrams and the Capsule Protocol
RFC 9298 - Proxying UDP in HTTP
RFC 9000 §16 — Variable-Length Integer Encoding
Signed-off-by: Aritra Basu <aritrbas+gh@cisco.com>
Closes #21153
77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
#ifndef HEADER_CURL_CAPSULE_H
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#define HEADER_CURL_CAPSULE_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if !defined(CURL_DISABLE_PROXY) && !defined(CURL_DISABLE_HTTP)
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#include "curlx/dynbuf.h"
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#include "bufq.h"
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/* HTTP Capsule constants */
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#define HTTP_CAPSULE_HEADER_MAX_SIZE 10
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/* HTTP Capsule function prototypes */
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/**
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* Write the capsule header (type + varint length + context ID) into `hdr`.
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* @param hdr Output buffer (must be >= HTTP_CAPSULE_HEADER_MAX_SIZE)
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* @param hdrlen Size of `hdr` in bytes
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* @param payload_len Length of the UDP payload that follows
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* @return Number of header bytes written, or 0 on error
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*/
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size_t Curl_capsule_encap_udp_hdr(uint8_t *hdr, size_t hdrlen,
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size_t payload_len);
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/**
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* Encapsulate UDP payload into HTTP Datagram capsule format
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* @param dyn Dynamic buffer to write capsule to
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* @param buf Payload buffer
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* @param blen Payload buffer length
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* @return CURLE_OK on success, error code on failure
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*/
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CURLcode Curl_capsule_encap_udp_datagram(struct dynbuf *dyn,
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const void *buf, size_t blen);
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/**
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* Process one UDP capsule from buffer into raw datagram payload bytes.
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* @param cf Connection filter
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* @param data Easy handle
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* @param recvbufq Buffer queue containing capsule data
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* @param buf Output buffer for one datagram payload
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* @param len Size of output buffer in bytes
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* @param err Error code output
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* @return Number of payload bytes written. Check `err` for status.
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*/
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size_t Curl_capsule_process_udp_raw(struct Curl_cfilter *cf,
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struct Curl_easy *data,
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struct bufq *recvbufq,
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unsigned char *buf, size_t len,
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CURLcode *err);
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#endif /* !CURL_DISABLE_PROXY && !CURL_DISABLE_HTTP */
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#endif /* HEADER_CURL_CAPSULE_H */
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