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0d3956b8c6
curl/lib/vquic/vquic.c
Stefan Eissing 331b89a319
http2: polish things around POST 
- added test cases for various code paths
- fixed handling of blocked write when stream had
  been closed inbetween attempts
- re-enabled DEBUGASSERT on send with smaller data size

- in debug builds, environment variables can be set to simulate a slow
  network when sending data. cf-socket.c and vquic.c support
  * CURL_DBG_SOCK_WBLOCK: percentage of send() calls that should be
    answered with a EAGAIN. TCP/UNIX sockets.
    This is chosen randomly.
  * CURL_DBG_SOCK_WPARTIAL: percentage of data that shall be written
    to the network. TCP/UNIX sockets.
    Example: 80 means a send with 1000 bytes would only send 800
    This is applied to every send.
  * CURL_DBG_QUIC_WBLOCK: percentage of send() calls that should be
    answered with EAGAIN. QUIC only.
    This is chosen randomly.

Closes #11756
2023-09-04 19:48:49 +02:00

657 lines
19 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
/* WIP, experimental: use recvmmsg() on linux
* we have no configure check, yet
* and also it is only available for _GNU_SOURCE, which
* we do not use otherwise.
#define HAVE_SENDMMSG
*/
#if defined(HAVE_SENDMMSG)
#define _GNU_SOURCE
#include <sys/socket.h>
#undef _GNU_SOURCE
#endif
#include "curl_setup.h"
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include "urldata.h"
#include "bufq.h"
#include "dynbuf.h"
#include "cfilters.h"
#include "curl_trc.h"
#include "curl_msh3.h"
#include "curl_ngtcp2.h"
#include "curl_quiche.h"
#include "rand.h"
#include "vquic.h"
#include "vquic_int.h"
#include "strerror.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#ifdef ENABLE_QUIC
#ifdef O_BINARY
#define QLOGMODE O_WRONLY|O_CREAT|O_BINARY
#else
#define QLOGMODE O_WRONLY|O_CREAT
#endif
#define NW_CHUNK_SIZE (64 * 1024)
#define NW_SEND_CHUNKS 2
void Curl_quic_ver(char *p, size_t len)
{
#if defined(USE_NGTCP2) && defined(USE_NGHTTP3)
Curl_ngtcp2_ver(p, len);
#elif defined(USE_QUICHE)
Curl_quiche_ver(p, len);
#elif defined(USE_MSH3)
Curl_msh3_ver(p, len);
#endif
}
CURLcode vquic_ctx_init(struct cf_quic_ctx *qctx)
{
Curl_bufq_init2(&qctx->sendbuf, NW_CHUNK_SIZE, NW_SEND_CHUNKS,
BUFQ_OPT_SOFT_LIMIT);
#if defined(__linux__) && defined(UDP_SEGMENT) && defined(HAVE_SENDMSG)
qctx->no_gso = FALSE;
#else
qctx->no_gso = TRUE;
#endif
#ifdef DEBUGBUILD
{
char *p = getenv("CURL_DBG_QUIC_WBLOCK");
if(p) {
long l = strtol(p, NULL, 10);
if(l >= 0 && l <= 100)
qctx->wblock_percent = (int)l;
}
}
#endif
return CURLE_OK;
}
void vquic_ctx_free(struct cf_quic_ctx *qctx)
{
Curl_bufq_free(&qctx->sendbuf);
}
static CURLcode send_packet_no_gso(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct cf_quic_ctx *qctx,
const uint8_t *pkt, size_t pktlen,
size_t gsolen, size_t *psent);
static CURLcode do_sendmsg(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct cf_quic_ctx *qctx,
const uint8_t *pkt, size_t pktlen, size_t gsolen,
size_t *psent)
{
#ifdef HAVE_SENDMSG
struct iovec msg_iov;
struct msghdr msg = {0};
ssize_t sent;
#if defined(__linux__) && defined(UDP_SEGMENT)
uint8_t msg_ctrl[32];
struct cmsghdr *cm;
#endif
*psent = 0;
msg_iov.iov_base = (uint8_t *)pkt;
msg_iov.iov_len = pktlen;
msg.msg_iov = &msg_iov;
msg.msg_iovlen = 1;
#if defined(__linux__) && defined(UDP_SEGMENT)
if(pktlen > gsolen) {
/* Only set this, when we need it. macOS, for example,
* does not seem to like a msg_control of length 0. */
msg.msg_control = msg_ctrl;
assert(sizeof(msg_ctrl) >= CMSG_SPACE(sizeof(uint16_t)));
msg.msg_controllen = CMSG_SPACE(sizeof(uint16_t));
cm = CMSG_FIRSTHDR(&msg);
cm->cmsg_level = SOL_UDP;
cm->cmsg_type = UDP_SEGMENT;
cm->cmsg_len = CMSG_LEN(sizeof(uint16_t));
*(uint16_t *)(void *)CMSG_DATA(cm) = gsolen & 0xffff;
}
#endif
while((sent = sendmsg(qctx->sockfd, &msg, 0)) == -1 && SOCKERRNO == EINTR)
;
if(sent == -1) {
switch(SOCKERRNO) {
case EAGAIN:
#if EAGAIN != EWOULDBLOCK
case EWOULDBLOCK:
#endif
return CURLE_AGAIN;
case EMSGSIZE:
/* UDP datagram is too large; caused by PMTUD. Just let it be lost. */
break;
case EIO:
if(pktlen > gsolen) {
/* GSO failure */
failf(data, "sendmsg() returned %zd (errno %d); disable GSO", sent,
SOCKERRNO);
qctx->no_gso = TRUE;
return send_packet_no_gso(cf, data, qctx, pkt, pktlen, gsolen, psent);
}
/* FALLTHROUGH */
default:
failf(data, "sendmsg() returned %zd (errno %d)", sent, SOCKERRNO);
return CURLE_SEND_ERROR;
}
}
else {
assert(pktlen == (size_t)sent);
}
#else
ssize_t sent;
(void)gsolen;
*psent = 0;
while((sent = send(qctx->sockfd,
(const char *)pkt, (SEND_TYPE_ARG3)pktlen, 0)) == -1 &&
SOCKERRNO == EINTR)
;
if(sent == -1) {
if(SOCKERRNO == EAGAIN || SOCKERRNO == EWOULDBLOCK) {
return CURLE_AGAIN;
}
else {
failf(data, "send() returned %zd (errno %d)", sent, SOCKERRNO);
if(SOCKERRNO != EMSGSIZE) {
return CURLE_SEND_ERROR;
}
/* UDP datagram is too large; caused by PMTUD. Just let it be
lost. */
}
}
#endif
(void)cf;
*psent = pktlen;
return CURLE_OK;
}
static CURLcode send_packet_no_gso(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct cf_quic_ctx *qctx,
const uint8_t *pkt, size_t pktlen,
size_t gsolen, size_t *psent)
{
const uint8_t *p, *end = pkt + pktlen;
size_t sent;
*psent = 0;
for(p = pkt; p < end; p += gsolen) {
size_t len = CURLMIN(gsolen, (size_t)(end - p));
CURLcode curlcode = do_sendmsg(cf, data, qctx, p, len, len, &sent);
if(curlcode != CURLE_OK) {
return curlcode;
}
*psent += sent;
}
return CURLE_OK;
}
static CURLcode vquic_send_packets(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct cf_quic_ctx *qctx,
const uint8_t *pkt, size_t pktlen,
size_t gsolen, size_t *psent)
{
#ifdef DEBUGBUILD
/* simulate network blocking/partial writes */
if(qctx->wblock_percent > 0) {
unsigned char c;
Curl_rand(data, &c, 1);
if(c >= ((100-qctx->wblock_percent)*256/100)) {
CURL_TRC_CF(data, cf, "vquic_flush() simulate EWOULDBLOCK");
return CURLE_AGAIN;
}
}
#endif
if(qctx->no_gso && pktlen > gsolen) {
return send_packet_no_gso(cf, data, qctx, pkt, pktlen, gsolen, psent);
}
return do_sendmsg(cf, data, qctx, pkt, pktlen, gsolen, psent);
}
CURLcode vquic_flush(struct Curl_cfilter *cf, struct Curl_easy *data,
struct cf_quic_ctx *qctx)
{
const unsigned char *buf;
size_t blen, sent;
CURLcode result;
size_t gsolen;
while(Curl_bufq_peek(&qctx->sendbuf, &buf, &blen)) {
gsolen = qctx->gsolen;
if(qctx->split_len) {
gsolen = qctx->split_gsolen;
if(blen > qctx->split_len)
blen = qctx->split_len;
}
result = vquic_send_packets(cf, data, qctx, buf, blen, gsolen, &sent);
CURL_TRC_CF(data, cf, "vquic_send(len=%zu, gso=%zu) -> %d, sent=%zu",
blen, gsolen, result, sent);
if(result) {
if(result == CURLE_AGAIN) {
Curl_bufq_skip(&qctx->sendbuf, sent);
if(qctx->split_len)
qctx->split_len -= sent;
}
return result;
}
Curl_bufq_skip(&qctx->sendbuf, sent);
if(qctx->split_len)
qctx->split_len -= sent;
}
return CURLE_OK;
}
CURLcode vquic_send(struct Curl_cfilter *cf, struct Curl_easy *data,
struct cf_quic_ctx *qctx, size_t gsolen)
{
qctx->gsolen = gsolen;
return vquic_flush(cf, data, qctx);
}
CURLcode vquic_send_tail_split(struct Curl_cfilter *cf, struct Curl_easy *data,
struct cf_quic_ctx *qctx, size_t gsolen,
size_t tail_len, size_t tail_gsolen)
{
DEBUGASSERT(Curl_bufq_len(&qctx->sendbuf) > tail_len);
qctx->split_len = Curl_bufq_len(&qctx->sendbuf) - tail_len;
qctx->split_gsolen = gsolen;
qctx->gsolen = tail_gsolen;
CURL_TRC_CF(data, cf, "vquic_send_tail_split: [%zu gso=%zu][%zu gso=%zu]",
qctx->split_len, qctx->split_gsolen,
tail_len, qctx->gsolen);
return vquic_flush(cf, data, qctx);
}
#ifdef HAVE_SENDMMSG
static CURLcode recvmmsg_packets(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct cf_quic_ctx *qctx,
size_t max_pkts,
vquic_recv_pkt_cb *recv_cb, void *userp)
{
#define MMSG_NUM 64
struct iovec msg_iov[MMSG_NUM];
struct mmsghdr mmsg[MMSG_NUM];
uint8_t bufs[MMSG_NUM][2*1024];
struct sockaddr_storage remote_addr[MMSG_NUM];
size_t total_nread, pkts;
int mcount, i, n;
char errstr[STRERROR_LEN];
CURLcode result = CURLE_OK;
DEBUGASSERT(max_pkts > 0);
pkts = 0;
total_nread = 0;
while(pkts < max_pkts) {
n = (int)CURLMIN(MMSG_NUM, max_pkts);
memset(&mmsg, 0, sizeof(mmsg));
for(i = 0; i < n; ++i) {
msg_iov[i].iov_base = bufs[i];
msg_iov[i].iov_len = (int)sizeof(bufs[i]);
mmsg[i].msg_hdr.msg_iov = &msg_iov[i];
mmsg[i].msg_hdr.msg_iovlen = 1;
mmsg[i].msg_hdr.msg_name = &remote_addr[i];
mmsg[i].msg_hdr.msg_namelen = sizeof(remote_addr[i]);
}
while((mcount = recvmmsg(qctx->sockfd, mmsg, n, 0, NULL)) == -1 &&
SOCKERRNO == EINTR)
;
if(mcount == -1) {
if(SOCKERRNO == EAGAIN || SOCKERRNO == EWOULDBLOCK) {
CURL_TRC_CF(data, cf, "ingress, recvmmsg -> EAGAIN");
goto out;
}
if(!cf->connected && SOCKERRNO == ECONNREFUSED) {
const char *r_ip = NULL;
int r_port = 0;
Curl_cf_socket_peek(cf->next, data, NULL, NULL,
&r_ip, &r_port, NULL, NULL);
failf(data, "QUIC: connection to %s port %u refused",
r_ip, r_port);
result = CURLE_COULDNT_CONNECT;
goto out;
}
Curl_strerror(SOCKERRNO, errstr, sizeof(errstr));
failf(data, "QUIC: recvmsg() unexpectedly returned %d (errno=%d; %s)",
mcount, SOCKERRNO, errstr);
result = CURLE_RECV_ERROR;
goto out;
}
CURL_TRC_CF(data, cf, "recvmmsg() -> %d packets", mcount);
pkts += mcount;
for(i = 0; i < mcount; ++i) {
total_nread += mmsg[i].msg_len;
result = recv_cb(bufs[i], mmsg[i].msg_len,
mmsg[i].msg_hdr.msg_name, mmsg[i].msg_hdr.msg_namelen,
0, userp);
if(result)
goto out;
}
}
out:
if(total_nread || result)
CURL_TRC_CF(data, cf, "recvd %zu packets with %zu bytes -> %d",
pkts, total_nread, result);
return result;
}
#elif defined(HAVE_SENDMSG)
static CURLcode recvmsg_packets(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct cf_quic_ctx *qctx,
size_t max_pkts,
vquic_recv_pkt_cb *recv_cb, void *userp)
{
struct iovec msg_iov;
struct msghdr msg;
uint8_t buf[64*1024];
struct sockaddr_storage remote_addr;
size_t total_nread, pkts;
ssize_t nread;
char errstr[STRERROR_LEN];
CURLcode result = CURLE_OK;
msg_iov.iov_base = buf;
msg_iov.iov_len = (int)sizeof(buf);
memset(&msg, 0, sizeof(msg));
msg.msg_iov = &msg_iov;
msg.msg_iovlen = 1;
DEBUGASSERT(max_pkts > 0);
for(pkts = 0, total_nread = 0; pkts < max_pkts;) {
msg.msg_name = &remote_addr;
msg.msg_namelen = sizeof(remote_addr);
while((nread = recvmsg(qctx->sockfd, &msg, 0)) == -1 &&
SOCKERRNO == EINTR)
;
if(nread == -1) {
if(SOCKERRNO == EAGAIN || SOCKERRNO == EWOULDBLOCK) {
goto out;
}
if(!cf->connected && SOCKERRNO == ECONNREFUSED) {
const char *r_ip = NULL;
int r_port = 0;
Curl_cf_socket_peek(cf->next, data, NULL, NULL,
&r_ip, &r_port, NULL, NULL);
failf(data, "QUIC: connection to %s port %u refused",
r_ip, r_port);
result = CURLE_COULDNT_CONNECT;
goto out;
}
Curl_strerror(SOCKERRNO, errstr, sizeof(errstr));
failf(data, "QUIC: recvmsg() unexpectedly returned %zd (errno=%d; %s)",
nread, SOCKERRNO, errstr);
result = CURLE_RECV_ERROR;
goto out;
}
++pkts;
total_nread += (size_t)nread;
result = recv_cb(buf, (size_t)nread, msg.msg_name, msg.msg_namelen,
0, userp);
if(result)
goto out;
}
out:
if(total_nread || result)
CURL_TRC_CF(data, cf, "recvd %zu packets with %zu bytes -> %d",
pkts, total_nread, result);
return result;
}
#else /* HAVE_SENDMMSG || HAVE_SENDMSG */
static CURLcode recvfrom_packets(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct cf_quic_ctx *qctx,
size_t max_pkts,
vquic_recv_pkt_cb *recv_cb, void *userp)
{
uint8_t buf[64*1024];
int bufsize = (int)sizeof(buf);
struct sockaddr_storage remote_addr;
socklen_t remote_addrlen = sizeof(remote_addr);
size_t total_nread, pkts;
ssize_t nread;
char errstr[STRERROR_LEN];
CURLcode result = CURLE_OK;
DEBUGASSERT(max_pkts > 0);
for(pkts = 0, total_nread = 0; pkts < max_pkts;) {
while((nread = recvfrom(qctx->sockfd, (char *)buf, bufsize, 0,
(struct sockaddr *)&remote_addr,
&remote_addrlen)) == -1 &&
SOCKERRNO == EINTR)
;
if(nread == -1) {
if(SOCKERRNO == EAGAIN || SOCKERRNO == EWOULDBLOCK) {
CURL_TRC_CF(data, cf, "ingress, recvfrom -> EAGAIN");
goto out;
}
if(!cf->connected && SOCKERRNO == ECONNREFUSED) {
const char *r_ip = NULL;
int r_port = 0;
Curl_cf_socket_peek(cf->next, data, NULL, NULL,
&r_ip, &r_port, NULL, NULL);
failf(data, "QUIC: connection to %s port %u refused",
r_ip, r_port);
result = CURLE_COULDNT_CONNECT;
goto out;
}
Curl_strerror(SOCKERRNO, errstr, sizeof(errstr));
failf(data, "QUIC: recvfrom() unexpectedly returned %zd (errno=%d; %s)",
nread, SOCKERRNO, errstr);
result = CURLE_RECV_ERROR;
goto out;
}
++pkts;
total_nread += (size_t)nread;
result = recv_cb(buf, (size_t)nread, &remote_addr, remote_addrlen,
0, userp);
if(result)
goto out;
}
out:
if(total_nread || result)
CURL_TRC_CF(data, cf, "recvd %zu packets with %zu bytes -> %d",
pkts, total_nread, result);
return result;
}
#endif /* !HAVE_SENDMMSG && !HAVE_SENDMSG */
CURLcode vquic_recv_packets(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct cf_quic_ctx *qctx,
size_t max_pkts,
vquic_recv_pkt_cb *recv_cb, void *userp)
{
#if defined(HAVE_SENDMMSG)
return recvmmsg_packets(cf, data, qctx, max_pkts, recv_cb, userp);
#elif defined(HAVE_SENDMSG)
return recvmsg_packets(cf, data, qctx, max_pkts, recv_cb, userp);
#else
return recvfrom_packets(cf, data, qctx, max_pkts, recv_cb, userp);
#endif
}
/*
* If the QLOGDIR environment variable is set, open and return a file
* descriptor to write the log to.
*
* This function returns error if something failed outside of failing to
* create the file. Open file success is deemed by seeing if the returned fd
* is != -1.
*/
CURLcode Curl_qlogdir(struct Curl_easy *data,
unsigned char *scid,
size_t scidlen,
int *qlogfdp)
{
const char *qlog_dir = getenv("QLOGDIR");
*qlogfdp = -1;
if(qlog_dir) {
struct dynbuf fname;
CURLcode result;
unsigned int i;
Curl_dyn_init(&fname, DYN_QLOG_NAME);
result = Curl_dyn_add(&fname, qlog_dir);
if(!result)
result = Curl_dyn_add(&fname, "/");
for(i = 0; (i < scidlen) && !result; i++) {
char hex[3];
msnprintf(hex, 3, "%02x", scid[i]);
result = Curl_dyn_add(&fname, hex);
}
if(!result)
result = Curl_dyn_add(&fname, ".sqlog");
if(!result) {
int qlogfd = open(Curl_dyn_ptr(&fname), QLOGMODE,
data->set.new_file_perms);
if(qlogfd != -1)
*qlogfdp = qlogfd;
}
Curl_dyn_free(&fname);
if(result)
return result;
}
return CURLE_OK;
}
CURLcode Curl_cf_quic_create(struct Curl_cfilter **pcf,
struct Curl_easy *data,
struct connectdata *conn,
const struct Curl_addrinfo *ai,
int transport)
{
(void)transport;
DEBUGASSERT(transport == TRNSPRT_QUIC);
#if defined(USE_NGTCP2) && defined(USE_NGHTTP3)
return Curl_cf_ngtcp2_create(pcf, data, conn, ai);
#elif defined(USE_QUICHE)
return Curl_cf_quiche_create(pcf, data, conn, ai);
#elif defined(USE_MSH3)
return Curl_cf_msh3_create(pcf, data, conn, ai);
#else
*pcf = NULL;
(void)data;
(void)conn;
(void)ai;
return CURLE_NOT_BUILT_IN;
#endif
}
bool Curl_conn_is_http3(const struct Curl_easy *data,
const struct connectdata *conn,
int sockindex)
{
#if defined(USE_NGTCP2) && defined(USE_NGHTTP3)
return Curl_conn_is_ngtcp2(data, conn, sockindex);
#elif defined(USE_QUICHE)
return Curl_conn_is_quiche(data, conn, sockindex);
#elif defined(USE_MSH3)
return Curl_conn_is_msh3(data, conn, sockindex);
#else
return ((conn->handler->protocol & PROTO_FAMILY_HTTP) &&
(conn->httpversion == 30));
#endif
}
CURLcode Curl_conn_may_http3(struct Curl_easy *data,
const struct connectdata *conn)
{
if(conn->transport == TRNSPRT_UNIX) {
/* cannot do QUIC over a unix domain socket */
return CURLE_QUIC_CONNECT_ERROR;
}
if(!(conn->handler->flags & PROTOPT_SSL)) {
failf(data, "HTTP/3 requested for non-HTTPS URL");
return CURLE_URL_MALFORMAT;
}
#ifndef CURL_DISABLE_PROXY
if(conn->bits.socksproxy) {
failf(data, "HTTP/3 is not supported over a SOCKS proxy");
return CURLE_URL_MALFORMAT;
}
if(conn->bits.httpproxy && conn->bits.tunnel_proxy) {
failf(data, "HTTP/3 is not supported over a HTTP proxy");
return CURLE_URL_MALFORMAT;
}
#endif
return CURLE_OK;
}
#else /* ENABLE_QUIC */
CURLcode Curl_conn_may_http3(struct Curl_easy *data,
const struct connectdata *conn)
{
(void)conn;
(void)data;
DEBUGF(infof(data, "QUIC is not supported in this build"));
return CURLE_NOT_BUILT_IN;
}
#endif /* !ENABLE_QUIC */
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