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FFmpeg/libavformat/network.c
Vittorio Giovara 45340f9fc7 network: Do not leave context locked on error 
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2015-04-23 13:42:33 +02:00

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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 "url.h"
#include "libavcodec/internal.h"
#include "libavutil/avutil.h"
#include "libavutil/mem.h"
#include "libavutil/time.h"
#if HAVE_THREADS
#if HAVE_PTHREADS
#include <pthread.h>
#elif HAVE_OS2THREADS
#include "compat/os2threads.h"
#else
#include "compat/w32pthreads.h"
#endif
#endif
#if CONFIG_OPENSSL
#include <openssl/ssl.h>
static int openssl_init;
#if HAVE_THREADS
#include <openssl/crypto.h>
pthread_mutex_t *openssl_mutexes;
static void openssl_lock(int mode, int type, const char *file, int line)
{
if (mode & CRYPTO_LOCK)
pthread_mutex_lock(&openssl_mutexes[type]);
else
pthread_mutex_unlock(&openssl_mutexes[type]);
}
#if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
static unsigned long openssl_thread_id(void)
{
return (intptr_t) pthread_self();
}
#endif
#endif
#endif
#if CONFIG_GNUTLS
#include <gnutls/gnutls.h>
#if HAVE_THREADS && GNUTLS_VERSION_NUMBER <= 0x020b00
#include <gcrypt.h>
#include <errno.h>
GCRY_THREAD_OPTION_PTHREAD_IMPL;
#endif
#endif
int ff_tls_init(void)
{
avpriv_lock_avformat();
#if CONFIG_OPENSSL
if (!openssl_init) {
SSL_library_init();
SSL_load_error_strings();
#if HAVE_THREADS
if (!CRYPTO_get_locking_callback()) {
int i;
openssl_mutexes = av_malloc_array(sizeof(pthread_mutex_t), CRYPTO_num_locks());
if (!openssl_mutexes) {
avpriv_unlock_avformat();
return AVERROR(ENOMEM);
}
for (i = 0; i < CRYPTO_num_locks(); i++)
pthread_mutex_init(&openssl_mutexes[i], NULL);
CRYPTO_set_locking_callback(openssl_lock);
#if !defined(WIN32) && OPENSSL_VERSION_NUMBER < 0x10000000
CRYPTO_set_id_callback(openssl_thread_id);
#endif
}
#endif
}
openssl_init++;
#endif
#if CONFIG_GNUTLS
#if HAVE_THREADS && GNUTLS_VERSION_NUMBER < 0x020b00
if (gcry_control(GCRYCTL_ANY_INITIALIZATION_P) == 0)
gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
#endif
gnutls_global_init();
#endif
avpriv_unlock_avformat();
return 0;
}
void ff_tls_deinit(void)
{
avpriv_lock_avformat();
#if CONFIG_OPENSSL
openssl_init--;
if (!openssl_init) {
#if HAVE_THREADS
if (CRYPTO_get_locking_callback() == openssl_lock) {
int i;
CRYPTO_set_locking_callback(NULL);
for (i = 0; i < CRYPTO_num_locks(); i++)
pthread_mutex_destroy(&openssl_mutexes[i]);
av_free(openssl_mutexes);
}
#endif
}
#endif
#if CONFIG_GNUTLS
gnutls_global_deinit();
#endif
avpriv_unlock_avformat();
}
int ff_network_inited_globally;
int ff_network_init(void)
{
#if HAVE_WINSOCK2_H
WSADATA wsaData;
#endif
if (!ff_network_inited_globally)
av_log(NULL, AV_LOG_WARNING, "Using network protocols without global "
"network initialization. Please use "
"avformat_network_init(), this will "
"become mandatory later.\n");
#if HAVE_WINSOCK2_H
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, 100);
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);
}
}
}
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)
break;
} while (timeout <= 0 || runs-- > 0);
if (!ret)
return AVERROR(ETIMEDOUT);
if (ret < 0)
return AVERROR(errno);
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
}
return fd;
}
int ff_listen_bind(int fd, const struct sockaddr *addr,
socklen_t addrlen, int timeout, URLContext *h)
{
int ret;
int reuse = 1;
struct pollfd lp = { fd, POLLIN, 0 };
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();
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();
closesocket(fd);
if (ff_socket_nonblock(ret, 1) < 0)
av_log(NULL, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
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(NULL, 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 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;
}
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