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FFmpeg4/libavformat/network.c

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/*
* Copyright (c) 2007 The FFmpeg Project
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <fcntl.h>
#include "network.h"
#include "tls.h"
#include "url.h"
#include "libavcodec/internal.h"
#include "libavutil/avutil.h"
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/time.h"
int ff_tls_init(void)
{
#if CONFIG_TLS_PROTOCOL
#if CONFIG_OPENSSL
int ret;
if ((ret = ff_openssl_init()) < 0)
return ret;
#endif
#if CONFIG_GNUTLS
ff_gnutls_init();
#endif
#endif
return 0;
}
void ff_tls_deinit(void)
{
#if CONFIG_TLS_PROTOCOL
#if CONFIG_OPENSSL
ff_openssl_deinit();
#endif
#if CONFIG_GNUTLS
ff_gnutls_deinit();
#endif
#endif
}
int ff_network_init(void)
{
#if HAVE_WINSOCK2_H
WSADATA wsaData;
if (WSAStartup(MAKEWORD(1,1), &wsaData))
return 0;
#endif
return 1;
}
int ff_network_wait_fd(int fd, int write)
{
int ev = write ? POLLOUT : POLLIN;
struct pollfd p = { .fd = fd, .events = ev, .revents = 0 };
int ret;
ret = poll(&p, 1, POLLING_TIME);
return ret < 0 ? ff_neterrno() : p.revents & (ev | POLLERR | POLLHUP) ? 0 : AVERROR(EAGAIN);
}
int ff_network_wait_fd_timeout(int fd, int write, int64_t timeout, AVIOInterruptCB *int_cb)
{
int ret;
int64_t wait_start = 0;
while (1) {
if (ff_check_interrupt(int_cb))
return AVERROR_EXIT;
ret = ff_network_wait_fd(fd, write);
if (ret != AVERROR(EAGAIN))
return ret;
if (timeout > 0) {
if (!wait_start)
wait_start = av_gettime_relative();
else if (av_gettime_relative() - wait_start > timeout)
return AVERROR(ETIMEDOUT);
}
}
}
int ff_network_sleep_interruptible(int64_t timeout, AVIOInterruptCB *int_cb)
{
int64_t wait_start = av_gettime_relative();
while (1) {
int64_t time_left;
if (ff_check_interrupt(int_cb))
return AVERROR_EXIT;
time_left = timeout - (av_gettime_relative() - wait_start);
if (time_left <= 0)
return AVERROR(ETIMEDOUT);
av_usleep(FFMIN(time_left, POLLING_TIME * 1000));
}
}
void ff_network_close(void)
{
#if HAVE_WINSOCK2_H
WSACleanup();
#endif
}
#if HAVE_WINSOCK2_H
int ff_neterrno(void)
{
int err = WSAGetLastError();
switch (err) {
case WSAEWOULDBLOCK:
return AVERROR(EAGAIN);
case WSAEINTR:
return AVERROR(EINTR);
case WSAEPROTONOSUPPORT:
return AVERROR(EPROTONOSUPPORT);
case WSAETIMEDOUT:
return AVERROR(ETIMEDOUT);
case WSAECONNREFUSED:
return AVERROR(ECONNREFUSED);
case WSAEINPROGRESS:
return AVERROR(EINPROGRESS);
}
return -err;
}
#endif
int ff_is_multicast_address(struct sockaddr *addr)
{
if (addr->sa_family == AF_INET) {
return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
}
#if HAVE_STRUCT_SOCKADDR_IN6
if (addr->sa_family == AF_INET6) {
return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
}
#endif
return 0;
}
static int ff_poll_interrupt(struct pollfd *p, nfds_t nfds, int timeout,
AVIOInterruptCB *cb)
{
int runs = timeout / POLLING_TIME;
int ret = 0;
do {
if (ff_check_interrupt(cb))
return AVERROR_EXIT;
ret = poll(p, nfds, POLLING_TIME);
if (ret != 0) {
if (ret < 0)
ret = ff_neterrno();
if (ret == AVERROR(EINTR))
continue;
break;
}
} while (timeout <= 0 || runs-- > 0);
if (!ret)
return AVERROR(ETIMEDOUT);
return ret;
}
int ff_socket(int af, int type, int proto)
{
int fd;
#ifdef SOCK_CLOEXEC
fd = socket(af, type | SOCK_CLOEXEC, proto);
if (fd == -1 && errno == EINVAL)
#endif
{
fd = socket(af, type, proto);
#if HAVE_FCNTL
if (fd != -1) {
if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
av_log(NULL, AV_LOG_DEBUG, "Failed to set close on exec\n");
}
#endif
}
#ifdef SO_NOSIGPIPE
if (fd != -1) {
if (setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, &(int){1}, sizeof(int))) {
av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_NOSIGPIPE) failed\n");
}
}
#endif
return fd;
}
int ff_listen(int fd, const struct sockaddr *addr,
socklen_t addrlen)
{
int ret;
int reuse = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))) {
av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_REUSEADDR) failed\n");
}
ret = bind(fd, addr, addrlen);
if (ret)
return ff_neterrno();
ret = listen(fd, 1);
if (ret)
return ff_neterrno();
return ret;
}
int ff_accept(int fd, int timeout, URLContext *h)
{
int ret;
struct pollfd lp = { fd, POLLIN, 0 };
ret = ff_poll_interrupt(&lp, 1, timeout, &h->interrupt_callback);
if (ret < 0)
return ret;
ret = accept(fd, NULL, NULL);
if (ret < 0)
return ff_neterrno();
if (ff_socket_nonblock(ret, 1) < 0)
av_log(h, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
return ret;
}
int ff_listen_bind(int fd, const struct sockaddr *addr,
socklen_t addrlen, int timeout, URLContext *h)
{
int ret;
if ((ret = ff_listen(fd, addr, addrlen)) < 0)
return ret;
if ((ret = ff_accept(fd, timeout, h)) < 0)
return ret;
closesocket(fd);
return ret;
}
int ff_listen_connect(int fd, const struct sockaddr *addr,
socklen_t addrlen, int timeout, URLContext *h,
int will_try_next)
{
struct pollfd p = {fd, POLLOUT, 0};
int ret;
socklen_t optlen;
if (ff_socket_nonblock(fd, 1) < 0)
av_log(h, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
while ((ret = connect(fd, addr, addrlen))) {
ret = ff_neterrno();
switch (ret) {
case AVERROR(EINTR):
if (ff_check_interrupt(&h->interrupt_callback))
return AVERROR_EXIT;
continue;
case AVERROR(EINPROGRESS):
case AVERROR(EAGAIN):
ret = ff_poll_interrupt(&p, 1, timeout, &h->interrupt_callback);
if (ret < 0)
return ret;
optlen = sizeof(ret);
if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen))
ret = AVUNERROR(ff_neterrno());
if (ret != 0) {
char errbuf[100];
ret = AVERROR(ret);
av_strerror(ret, errbuf, sizeof(errbuf));
if (will_try_next)
av_log(h, AV_LOG_WARNING,
"Connection to %s failed (%s), trying next address\n",
h->filename, errbuf);
else
av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
h->filename, errbuf);
}
default:
return ret;
}
}
return ret;
}
static void interleave_addrinfo(struct addrinfo *base)
{
struct addrinfo **next = &base->ai_next;
while (*next) {
struct addrinfo *cur = *next;
// Iterate forward until we find an entry of a different family.
if (cur->ai_family == base->ai_family) {
next = &cur->ai_next;
continue;
}
if (cur == base->ai_next) {
// If the first one following base is of a different family, just
// move base forward one step and continue.
base = cur;
next = &base->ai_next;
continue;
}
// Unchain cur from the rest of the list from its current spot.
*next = cur->ai_next;
// Hook in cur directly after base.
cur->ai_next = base->ai_next;
base->ai_next = cur;
// Restart with a new base. We know that before moving the cur element,
// everything between the previous base and cur had the same family,
// different from cur->ai_family. Therefore, we can keep next pointing
// where it was, and continue from there with base at the one after
// cur.
base = cur->ai_next;
}
}
static void print_address_list(void *ctx, const struct addrinfo *addr,
const char *title)
{
char hostbuf[100], portbuf[20];
av_log(ctx, AV_LOG_DEBUG, "%s:\n", title);
while (addr) {
getnameinfo(addr->ai_addr, addr->ai_addrlen,
hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf),
NI_NUMERICHOST | NI_NUMERICSERV);
av_log(ctx, AV_LOG_DEBUG, "Address %s port %s\n", hostbuf, portbuf);
addr = addr->ai_next;
}
}
struct ConnectionAttempt {
int fd;
int64_t deadline_us;
struct addrinfo *addr;
};
// Returns < 0 on error, 0 on successfully started connection attempt,
// > 0 for a connection that succeeded already.
static int start_connect_attempt(struct ConnectionAttempt *attempt,
struct addrinfo **ptr, int timeout_ms,
URLContext *h,
void (*customize_fd)(void *, int), void *customize_ctx)
{
struct addrinfo *ai = *ptr;
int ret;
*ptr = ai->ai_next;
attempt->fd = ff_socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (attempt->fd < 0)
return ff_neterrno();
attempt->deadline_us = av_gettime_relative() + timeout_ms * 1000;
attempt->addr = ai;
ff_socket_nonblock(attempt->fd, 1);
if (customize_fd)
customize_fd(customize_ctx, attempt->fd);
while ((ret = connect(attempt->fd, ai->ai_addr, ai->ai_addrlen))) {
ret = ff_neterrno();
switch (ret) {
case AVERROR(EINTR):
if (ff_check_interrupt(&h->interrupt_callback)) {
closesocket(attempt->fd);
attempt->fd = -1;
return AVERROR_EXIT;
}
continue;
case AVERROR(EINPROGRESS):
case AVERROR(EAGAIN):
return 0;
default:
closesocket(attempt->fd);
attempt->fd = -1;
return ret;
}
}
return 1;
}
// Try a new connection to another address after 200 ms, as suggested in
// RFC 8305 (or sooner if an earlier attempt fails).
#define NEXT_ATTEMPT_DELAY_MS 200
int ff_connect_parallel(struct addrinfo *addrs, int timeout_ms_per_address,
int parallel, URLContext *h, int *fd,
void (*customize_fd)(void *, int), void *customize_ctx)
{
struct ConnectionAttempt attempts[3];
struct pollfd pfd[3];
int nb_attempts = 0, i, j;
int64_t next_attempt_us = av_gettime_relative(), next_deadline_us;
int last_err = AVERROR(EIO);
socklen_t optlen;
char errbuf[100], hostbuf[100], portbuf[20];
if (parallel > FF_ARRAY_ELEMS(attempts))
parallel = FF_ARRAY_ELEMS(attempts);
print_address_list(h, addrs, "Original list of addresses");
// This mutates the list, but the head of the list is still the same
// element, so the caller, who owns the list, doesn't need to get
// an updated pointer.
interleave_addrinfo(addrs);
print_address_list(h, addrs, "Interleaved list of addresses");
while (nb_attempts > 0 || addrs) {
// Start a new connection attempt, if possible.
if (nb_attempts < parallel && addrs) {
getnameinfo(addrs->ai_addr, addrs->ai_addrlen,
hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf),
NI_NUMERICHOST | NI_NUMERICSERV);
av_log(h, AV_LOG_VERBOSE, "Starting connection attempt to %s port %s\n",
hostbuf, portbuf);
last_err = start_connect_attempt(&attempts[nb_attempts], &addrs,
timeout_ms_per_address, h,
customize_fd, customize_ctx);
if (last_err < 0) {
av_strerror(last_err, errbuf, sizeof(errbuf));
av_log(h, AV_LOG_VERBOSE, "Connected attempt failed: %s\n",
errbuf);
continue;
}
if (last_err > 0) {
for (i = 0; i < nb_attempts; i++)
closesocket(attempts[i].fd);
*fd = attempts[nb_attempts].fd;
return 0;
}
pfd[nb_attempts].fd = attempts[nb_attempts].fd;
pfd[nb_attempts].events = POLLOUT;
next_attempt_us = av_gettime_relative() + NEXT_ATTEMPT_DELAY_MS * 1000;
nb_attempts++;
}
av_assert0(nb_attempts > 0);
// The connection attempts are sorted from oldest to newest, so the
// first one will have the earliest deadline.
next_deadline_us = attempts[0].deadline_us;
// If we can start another attempt in parallel, wait until that time.
if (nb_attempts < parallel && addrs)
next_deadline_us = FFMIN(next_deadline_us, next_attempt_us);
last_err = ff_poll_interrupt(pfd, nb_attempts,
(next_deadline_us - av_gettime_relative())/1000,
&h->interrupt_callback);
if (last_err < 0 && last_err != AVERROR(ETIMEDOUT))
break;
// Check the status from the poll output.
for (i = 0; i < nb_attempts; i++) {
last_err = 0;
if (pfd[i].revents) {
// Some sort of action for this socket, check its status (either
// a successful connection or an error).
optlen = sizeof(last_err);
if (getsockopt(attempts[i].fd, SOL_SOCKET, SO_ERROR, &last_err, &optlen))
last_err = ff_neterrno();
else if (last_err != 0)
last_err = AVERROR(last_err);
if (last_err == 0) {
// Everything is ok, we seem to have a successful
// connection. Close other sockets and return this one.
for (j = 0; j < nb_attempts; j++)
if (j != i)
closesocket(attempts[j].fd);
*fd = attempts[i].fd;
getnameinfo(attempts[i].addr->ai_addr, attempts[i].addr->ai_addrlen,
hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf),
NI_NUMERICHOST | NI_NUMERICSERV);
av_log(h, AV_LOG_VERBOSE, "Successfully connected to %s port %s\n",
hostbuf, portbuf);
return 0;
}
}
if (attempts[i].deadline_us < av_gettime_relative() && !last_err)
last_err = AVERROR(ETIMEDOUT);
if (!last_err)
continue;
// Error (or timeout) for this socket; close the socket and remove
// it from the attempts/pfd arrays, to let a new attempt start
// directly.
getnameinfo(attempts[i].addr->ai_addr, attempts[i].addr->ai_addrlen,
hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf),
NI_NUMERICHOST | NI_NUMERICSERV);
av_strerror(last_err, errbuf, sizeof(errbuf));
av_log(h, AV_LOG_VERBOSE, "Connection attempt to %s port %s "
"failed: %s\n", hostbuf, portbuf, errbuf);
closesocket(attempts[i].fd);
memmove(&attempts[i], &attempts[i + 1],
(nb_attempts - i - 1) * sizeof(*attempts));
memmove(&pfd[i], &pfd[i + 1],
(nb_attempts - i - 1) * sizeof(*pfd));
i--;
nb_attempts--;
}
}
for (i = 0; i < nb_attempts; i++)
closesocket(attempts[i].fd);
if (last_err >= 0)
last_err = AVERROR(ECONNREFUSED);
if (last_err != AVERROR_EXIT) {
av_strerror(last_err, errbuf, sizeof(errbuf));
av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
h->filename, errbuf);
}
return last_err;
}
static int match_host_pattern(const char *pattern, const char *hostname)
{
int len_p, len_h;
if (!strcmp(pattern, "*"))
return 1;
// Skip a possible *. at the start of the pattern
if (pattern[0] == '*')
pattern++;
if (pattern[0] == '.')
pattern++;
len_p = strlen(pattern);
len_h = strlen(hostname);
if (len_p > len_h)
return 0;
// Simply check if the end of hostname is equal to 'pattern'
if (!strcmp(pattern, &hostname[len_h - len_p])) {
if (len_h == len_p)
return 1; // Exact match
if (hostname[len_h - len_p - 1] == '.')
return 1; // The matched substring is a domain and not just a substring of a domain
}
return 0;
}
int ff_http_match_no_proxy(const char *no_proxy, const char *hostname)
{
char *buf, *start;
int ret = 0;
if (!no_proxy)
return 0;
if (!hostname)
return 0;
buf = av_strdup(no_proxy);
if (!buf)
return 0;
start = buf;
while (start) {
char *sep, *next = NULL;
start += strspn(start, " ,");
sep = start + strcspn(start, " ,");
if (*sep) {
next = sep + 1;
*sep = '\0';
}
if (match_host_pattern(start, hostname)) {
ret = 1;
break;
}
start = next;
}
av_free(buf);
return ret;
}
void ff_log_net_error(void *ctx, int level, const char* prefix)
{
char errbuf[100];
av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
av_log(ctx, level, "%s: %s\n", prefix, errbuf);
}
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