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network.c
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1 /*
2  * Copyright (c) 2007 The FFmpeg Project
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <fcntl.h>
22 #include "network.h"
23 #include "tls.h"
24 #include "url.h"
25 #include "libavcodec/internal.h"
26 #include "libavutil/avutil.h"
27 #include "libavutil/mem.h"
28 #include "libavutil/time.h"
29 
30 int ff_tls_init(void)
31 {
32 #if CONFIG_TLS_OPENSSL_PROTOCOL
33  int ret;
34  if ((ret = ff_openssl_init()) < 0)
35  return ret;
36 #endif
37 #if CONFIG_TLS_GNUTLS_PROTOCOL
39 #endif
40  return 0;
41 }
42 
43 void ff_tls_deinit(void)
44 {
45 #if CONFIG_TLS_OPENSSL_PROTOCOL
47 #endif
48 #if CONFIG_TLS_GNUTLS_PROTOCOL
50 #endif
51 }
52 
54 
55 int ff_network_init(void)
56 {
57 #if HAVE_WINSOCK2_H
58  WSADATA wsaData;
59 #endif
60 
62  av_log(NULL, AV_LOG_WARNING, "Using network protocols without global "
63  "network initialization. Please use "
64  "avformat_network_init(), this will "
65  "become mandatory later.\n");
66 #if HAVE_WINSOCK2_H
67  if (WSAStartup(MAKEWORD(1,1), &wsaData))
68  return 0;
69 #endif
70  return 1;
71 }
72 
73 int ff_network_wait_fd(int fd, int write)
74 {
75  int ev = write ? POLLOUT : POLLIN;
76  struct pollfd p = { .fd = fd, .events = ev, .revents = 0 };
77  int ret;
78  ret = poll(&p, 1, POLLING_TIME);
79  return ret < 0 ? ff_neterrno() : p.revents & (ev | POLLERR | POLLHUP) ? 0 : AVERROR(EAGAIN);
80 }
81 
82 int ff_network_wait_fd_timeout(int fd, int write, int64_t timeout, AVIOInterruptCB *int_cb)
83 {
84  int ret;
85  int64_t wait_start = 0;
86 
87  while (1) {
88  if (ff_check_interrupt(int_cb))
89  return AVERROR_EXIT;
90  ret = ff_network_wait_fd(fd, write);
91  if (ret != AVERROR(EAGAIN))
92  return ret;
93  if (timeout > 0) {
94  if (!wait_start)
95  wait_start = av_gettime_relative();
96  else if (av_gettime_relative() - wait_start > timeout)
97  return AVERROR(ETIMEDOUT);
98  }
99  }
100 }
101 
103 {
104 #if HAVE_WINSOCK2_H
105  WSACleanup();
106 #endif
107 }
108 
109 #if HAVE_WINSOCK2_H
110 int ff_neterrno(void)
111 {
112  int err = WSAGetLastError();
113  switch (err) {
114  case WSAEWOULDBLOCK:
115  return AVERROR(EAGAIN);
116  case WSAEINTR:
117  return AVERROR(EINTR);
118  case WSAEPROTONOSUPPORT:
119  return AVERROR(EPROTONOSUPPORT);
120  case WSAETIMEDOUT:
121  return AVERROR(ETIMEDOUT);
122  case WSAECONNREFUSED:
123  return AVERROR(ECONNREFUSED);
124  case WSAEINPROGRESS:
125  return AVERROR(EINPROGRESS);
126  }
127  return -err;
128 }
129 #endif
130 
131 int ff_is_multicast_address(struct sockaddr *addr)
132 {
133  if (addr->sa_family == AF_INET) {
134  return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
135  }
136 #if HAVE_STRUCT_SOCKADDR_IN6
137  if (addr->sa_family == AF_INET6) {
138  return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
139  }
140 #endif
141 
142  return 0;
143 }
144 
145 static int ff_poll_interrupt(struct pollfd *p, nfds_t nfds, int timeout,
147 {
148  int runs = timeout / POLLING_TIME;
149  int ret = 0;
150 
151  do {
152  if (ff_check_interrupt(cb))
153  return AVERROR_EXIT;
154  ret = poll(p, nfds, POLLING_TIME);
155  if (ret != 0)
156  break;
157  } while (timeout <= 0 || runs-- > 0);
158 
159  if (!ret)
160  return AVERROR(ETIMEDOUT);
161  if (ret < 0)
162  return AVERROR(errno);
163  return ret;
164 }
165 
166 int ff_socket(int af, int type, int proto)
167 {
168  int fd;
169 
170 #ifdef SOCK_CLOEXEC
171  fd = socket(af, type | SOCK_CLOEXEC, proto);
172  if (fd == -1 && errno == EINVAL)
173 #endif
174  {
175  fd = socket(af, type, proto);
176 #if HAVE_FCNTL
177  if (fd != -1) {
178  if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
179  av_log(NULL, AV_LOG_DEBUG, "Failed to set close on exec\n");
180  }
181 #endif
182  }
183 #ifdef SO_NOSIGPIPE
184  if (fd != -1)
185  setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, &(int){1}, sizeof(int));
186 #endif
187  return fd;
188 }
189 
190 int ff_listen(int fd, const struct sockaddr *addr,
191  socklen_t addrlen)
192 {
193  int ret;
194  int reuse = 1;
195  if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))) {
196  av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_REUSEADDR) failed\n");
197  }
198  ret = bind(fd, addr, addrlen);
199  if (ret)
200  return ff_neterrno();
201 
202  ret = listen(fd, 1);
203  if (ret)
204  return ff_neterrno();
205  return ret;
206 }
207 
208 int ff_accept(int fd, int timeout, URLContext *h)
209 {
210  int ret;
211  struct pollfd lp = { fd, POLLIN, 0 };
212 
213  ret = ff_poll_interrupt(&lp, 1, timeout, &h->interrupt_callback);
214  if (ret < 0)
215  return ret;
216 
217  ret = accept(fd, NULL, NULL);
218  if (ret < 0)
219  return ff_neterrno();
220  if (ff_socket_nonblock(ret, 1) < 0)
221  av_log(NULL, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
222 
223  return ret;
224 }
225 
226 int ff_listen_bind(int fd, const struct sockaddr *addr,
227  socklen_t addrlen, int timeout, URLContext *h)
228 {
229  int ret;
230  if ((ret = ff_listen(fd, addr, addrlen)) < 0)
231  return ret;
232  if ((ret = ff_accept(fd, timeout, h)) < 0)
233  return ret;
234  closesocket(fd);
235  return ret;
236 }
237 
238 int ff_listen_connect(int fd, const struct sockaddr *addr,
239  socklen_t addrlen, int timeout, URLContext *h,
240  int will_try_next)
241 {
242  struct pollfd p = {fd, POLLOUT, 0};
243  int ret;
244  socklen_t optlen;
245 
246  if (ff_socket_nonblock(fd, 1) < 0)
247  av_log(NULL, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
248 
249  while ((ret = connect(fd, addr, addrlen))) {
250  ret = ff_neterrno();
251  switch (ret) {
252  case AVERROR(EINTR):
254  return AVERROR_EXIT;
255  continue;
256  case AVERROR(EINPROGRESS):
257  case AVERROR(EAGAIN):
258  ret = ff_poll_interrupt(&p, 1, timeout, &h->interrupt_callback);
259  if (ret < 0)
260  return ret;
261  optlen = sizeof(ret);
262  if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen))
263  ret = AVUNERROR(ff_neterrno());
264  if (ret != 0) {
265  char errbuf[100];
266  ret = AVERROR(ret);
267  av_strerror(ret, errbuf, sizeof(errbuf));
268  if (will_try_next)
270  "Connection to %s failed (%s), trying next address\n",
271  h->filename, errbuf);
272  else
273  av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
274  h->filename, errbuf);
275  }
276  default:
277  return ret;
278  }
279  }
280  return ret;
281 }
282 
283 static int match_host_pattern(const char *pattern, const char *hostname)
284 {
285  int len_p, len_h;
286  if (!strcmp(pattern, "*"))
287  return 1;
288  // Skip a possible *. at the start of the pattern
289  if (pattern[0] == '*')
290  pattern++;
291  if (pattern[0] == '.')
292  pattern++;
293  len_p = strlen(pattern);
294  len_h = strlen(hostname);
295  if (len_p > len_h)
296  return 0;
297  // Simply check if the end of hostname is equal to 'pattern'
298  if (!strcmp(pattern, &hostname[len_h - len_p])) {
299  if (len_h == len_p)
300  return 1; // Exact match
301  if (hostname[len_h - len_p - 1] == '.')
302  return 1; // The matched substring is a domain and not just a substring of a domain
303  }
304  return 0;
305 }
306 
307 int ff_http_match_no_proxy(const char *no_proxy, const char *hostname)
308 {
309  char *buf, *start;
310  int ret = 0;
311  if (!no_proxy)
312  return 0;
313  if (!hostname)
314  return 0;
315  buf = av_strdup(no_proxy);
316  if (!buf)
317  return 0;
318  start = buf;
319  while (start) {
320  char *sep, *next = NULL;
321  start += strspn(start, " ,");
322  sep = start + strcspn(start, " ,");
323  if (*sep) {
324  next = sep + 1;
325  *sep = '\0';
326  }
327  if (match_host_pattern(start, hostname)) {
328  ret = 1;
329  break;
330  }
331  start = next;
332  }
333  av_free(buf);
334  return ret;
335 }
#define NULL
Definition: coverity.c:32
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
Memory handling functions.
static int match_host_pattern(const char *pattern, const char *hostname)
Definition: network.c:283
AVIOInterruptCB interrupt_callback
Definition: url.h:47
Convenience header that includes libavutil's core.
void ff_network_close(void)
Definition: network.c:102
int ff_tls_init(void)
Definition: network.c:30
static int ff_poll_interrupt(struct pollfd *p, nfds_t nfds, int timeout, AVIOInterruptCB *cb)
Definition: network.c:145
int ff_socket(int af, int type, int proto)
Definition: network.c:166
int ff_network_inited_globally
Definition: network.c:53
#define IN6_IS_ADDR_MULTICAST(a)
Definition: network.h:234
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:97
int ff_listen_bind(int fd, const struct sockaddr *addr, socklen_t addrlen, int timeout, URLContext *h)
Bind to a file descriptor and poll for a connection.
Definition: network.c:226
int ff_network_init(void)
Definition: network.c:55
int ff_openssl_init(void)
Definition: tls_openssl.c:150
int ff_listen(int fd, const struct sockaddr *addr, socklen_t addrlen)
Bind to a file descriptor to an address without accepting connections.
Definition: network.c:190
void ff_gnutls_init(void)
Definition: tls_gnutls.c:52
int ff_listen_connect(int fd, const struct sockaddr *addr, socklen_t addrlen, int timeout, URLContext *h, int will_try_next)
Connect to a file descriptor and poll for result.
Definition: network.c:238
#define av_log(a,...)
Callback for checking whether to abort blocking functions.
Definition: avio.h:50
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int ff_accept(int fd, int timeout, URLContext *h)
Poll for a single connection on the passed file descriptor.
Definition: network.c:208
const AVIOInterruptCB int_cb
Definition: ffmpeg.c:460
#define closesocket
Definition: ffserver.c:28
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int ff_is_multicast_address(struct sockaddr *addr)
Definition: network.c:131
int ff_network_wait_fd_timeout(int fd, int write, int64_t timeout, AVIOInterruptCB *int_cb)
This works similarly to ff_network_wait_fd, but waits up to 'timeout' microseconds Uses ff_network_wa...
Definition: network.c:82
#define ff_neterrno()
Definition: network.h:64
int ff_http_match_no_proxy(const char *no_proxy, const char *hostname)
Definition: network.c:307
int ff_socket_nonblock(int socket, int enable)
#define AVERROR_EXIT
Immediate exit was requested; the called function should not be restarted.
Definition: error.h:56
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:267
int ff_check_interrupt(AVIOInterruptCB *cb)
Check if the user has requested to interrupt a blocking function associated with cb.
Definition: avio.c:655
void * buf
Definition: avisynth_c.h:690
Definition: url.h:38
GLint GLenum type
Definition: opengl_enc.c:105
#define IN_MULTICAST(a)
Definition: network.h:231
#define POLLING_TIME
Definition: network.h:239
void ff_gnutls_deinit(void)
Definition: tls_gnutls.c:63
int64_t av_gettime_relative(void)
Get the current time in microseconds since some unspecified starting point.
Definition: time.c:56
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
Definition: error.c:105
int
common internal api header.
char * filename
specified URL
Definition: url.h:42
#define AVUNERROR(e)
Definition: error.h:44
#define av_free(p)
void ff_tls_deinit(void)
Definition: network.c:43
int ff_network_wait_fd(int fd, int write)
Definition: network.c:73
void INT64 start
Definition: avisynth_c.h:690
void ff_openssl_deinit(void)
Definition: tls_openssl.c:180
unbuffered private I/O API
#define MAKEWORD(a, b)
Definition: windows2linux.h:56