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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_PROTOCOL
33 #if CONFIG_OPENSSL
34  int ret;
35  if ((ret = ff_openssl_init()) < 0)
36  return ret;
37 #endif
38 #if CONFIG_GNUTLS
40 #endif
41 #endif
42  return 0;
43 }
44 
45 void ff_tls_deinit(void)
46 {
47 #if CONFIG_TLS_PROTOCOL
48 #if CONFIG_OPENSSL
50 #endif
51 #if CONFIG_GNUTLS
53 #endif
54 #endif
55 }
56 
58 
59 int ff_network_init(void)
60 {
61 #if HAVE_WINSOCK2_H
62  WSADATA wsaData;
63 #endif
64 
66  av_log(NULL, AV_LOG_WARNING, "Using network protocols without global "
67  "network initialization. Please use "
68  "avformat_network_init(), this will "
69  "become mandatory later.\n");
70 #if HAVE_WINSOCK2_H
71  if (WSAStartup(MAKEWORD(1,1), &wsaData))
72  return 0;
73 #endif
74  return 1;
75 }
76 
77 int ff_network_wait_fd(int fd, int write)
78 {
79  int ev = write ? POLLOUT : POLLIN;
80  struct pollfd p = { .fd = fd, .events = ev, .revents = 0 };
81  int ret;
82  ret = poll(&p, 1, POLLING_TIME);
83  return ret < 0 ? ff_neterrno() : p.revents & (ev | POLLERR | POLLHUP) ? 0 : AVERROR(EAGAIN);
84 }
85 
86 int ff_network_wait_fd_timeout(int fd, int write, int64_t timeout, AVIOInterruptCB *int_cb)
87 {
88  int ret;
89  int64_t wait_start = 0;
90 
91  while (1) {
92  if (ff_check_interrupt(int_cb))
93  return AVERROR_EXIT;
94  ret = ff_network_wait_fd(fd, write);
95  if (ret != AVERROR(EAGAIN))
96  return ret;
97  if (timeout > 0) {
98  if (!wait_start)
99  wait_start = av_gettime_relative();
100  else if (av_gettime_relative() - wait_start > timeout)
101  return AVERROR(ETIMEDOUT);
102  }
103  }
104 }
105 
107 {
108 #if HAVE_WINSOCK2_H
109  WSACleanup();
110 #endif
111 }
112 
113 #if HAVE_WINSOCK2_H
114 int ff_neterrno(void)
115 {
116  int err = WSAGetLastError();
117  switch (err) {
118  case WSAEWOULDBLOCK:
119  return AVERROR(EAGAIN);
120  case WSAEINTR:
121  return AVERROR(EINTR);
122  case WSAEPROTONOSUPPORT:
123  return AVERROR(EPROTONOSUPPORT);
124  case WSAETIMEDOUT:
125  return AVERROR(ETIMEDOUT);
126  case WSAECONNREFUSED:
127  return AVERROR(ECONNREFUSED);
128  case WSAEINPROGRESS:
129  return AVERROR(EINPROGRESS);
130  }
131  return -err;
132 }
133 #endif
134 
135 int ff_is_multicast_address(struct sockaddr *addr)
136 {
137  if (addr->sa_family == AF_INET) {
138  return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
139  }
140 #if HAVE_STRUCT_SOCKADDR_IN6
141  if (addr->sa_family == AF_INET6) {
142  return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
143  }
144 #endif
145 
146  return 0;
147 }
148 
149 static int ff_poll_interrupt(struct pollfd *p, nfds_t nfds, int timeout,
151 {
152  int runs = timeout / POLLING_TIME;
153  int ret = 0;
154 
155  do {
156  if (ff_check_interrupt(cb))
157  return AVERROR_EXIT;
158  ret = poll(p, nfds, POLLING_TIME);
159  if (ret != 0)
160  break;
161  } while (timeout <= 0 || runs-- > 0);
162 
163  if (!ret)
164  return AVERROR(ETIMEDOUT);
165  if (ret < 0)
166  return ff_neterrno();
167  return ret;
168 }
169 
170 int ff_socket(int af, int type, int proto)
171 {
172  int fd;
173 
174 #ifdef SOCK_CLOEXEC
175  fd = socket(af, type | SOCK_CLOEXEC, proto);
176  if (fd == -1 && errno == EINVAL)
177 #endif
178  {
179  fd = socket(af, type, proto);
180 #if HAVE_FCNTL
181  if (fd != -1) {
182  if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
183  av_log(NULL, AV_LOG_DEBUG, "Failed to set close on exec\n");
184  }
185 #endif
186  }
187 #ifdef SO_NOSIGPIPE
188  if (fd != -1)
189  setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, &(int){1}, sizeof(int));
190 #endif
191  return fd;
192 }
193 
194 int ff_listen(int fd, const struct sockaddr *addr,
195  socklen_t addrlen)
196 {
197  int ret;
198  int reuse = 1;
199  if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse))) {
200  av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_REUSEADDR) failed\n");
201  }
202  ret = bind(fd, addr, addrlen);
203  if (ret)
204  return ff_neterrno();
205 
206  ret = listen(fd, 1);
207  if (ret)
208  return ff_neterrno();
209  return ret;
210 }
211 
212 int ff_accept(int fd, int timeout, URLContext *h)
213 {
214  int ret;
215  struct pollfd lp = { fd, POLLIN, 0 };
216 
217  ret = ff_poll_interrupt(&lp, 1, timeout, &h->interrupt_callback);
218  if (ret < 0)
219  return ret;
220 
221  ret = accept(fd, NULL, NULL);
222  if (ret < 0)
223  return ff_neterrno();
224  if (ff_socket_nonblock(ret, 1) < 0)
225  av_log(NULL, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
226 
227  return ret;
228 }
229 
230 int ff_listen_bind(int fd, const struct sockaddr *addr,
231  socklen_t addrlen, int timeout, URLContext *h)
232 {
233  int ret;
234  if ((ret = ff_listen(fd, addr, addrlen)) < 0)
235  return ret;
236  if ((ret = ff_accept(fd, timeout, h)) < 0)
237  return ret;
238  closesocket(fd);
239  return ret;
240 }
241 
242 int ff_listen_connect(int fd, const struct sockaddr *addr,
243  socklen_t addrlen, int timeout, URLContext *h,
244  int will_try_next)
245 {
246  struct pollfd p = {fd, POLLOUT, 0};
247  int ret;
248  socklen_t optlen;
249 
250  if (ff_socket_nonblock(fd, 1) < 0)
251  av_log(NULL, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
252 
253  while ((ret = connect(fd, addr, addrlen))) {
254  ret = ff_neterrno();
255  switch (ret) {
256  case AVERROR(EINTR):
258  return AVERROR_EXIT;
259  continue;
260  case AVERROR(EINPROGRESS):
261  case AVERROR(EAGAIN):
262  ret = ff_poll_interrupt(&p, 1, timeout, &h->interrupt_callback);
263  if (ret < 0)
264  return ret;
265  optlen = sizeof(ret);
266  if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen))
267  ret = AVUNERROR(ff_neterrno());
268  if (ret != 0) {
269  char errbuf[100];
270  ret = AVERROR(ret);
271  av_strerror(ret, errbuf, sizeof(errbuf));
272  if (will_try_next)
274  "Connection to %s failed (%s), trying next address\n",
275  h->filename, errbuf);
276  else
277  av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
278  h->filename, errbuf);
279  }
280  default:
281  return ret;
282  }
283  }
284  return ret;
285 }
286 
287 static int match_host_pattern(const char *pattern, const char *hostname)
288 {
289  int len_p, len_h;
290  if (!strcmp(pattern, "*"))
291  return 1;
292  // Skip a possible *. at the start of the pattern
293  if (pattern[0] == '*')
294  pattern++;
295  if (pattern[0] == '.')
296  pattern++;
297  len_p = strlen(pattern);
298  len_h = strlen(hostname);
299  if (len_p > len_h)
300  return 0;
301  // Simply check if the end of hostname is equal to 'pattern'
302  if (!strcmp(pattern, &hostname[len_h - len_p])) {
303  if (len_h == len_p)
304  return 1; // Exact match
305  if (hostname[len_h - len_p - 1] == '.')
306  return 1; // The matched substring is a domain and not just a substring of a domain
307  }
308  return 0;
309 }
310 
311 int ff_http_match_no_proxy(const char *no_proxy, const char *hostname)
312 {
313  char *buf, *start;
314  int ret = 0;
315  if (!no_proxy)
316  return 0;
317  if (!hostname)
318  return 0;
319  buf = av_strdup(no_proxy);
320  if (!buf)
321  return 0;
322  start = buf;
323  while (start) {
324  char *sep, *next = NULL;
325  start += strspn(start, " ,");
326  sep = start + strcspn(start, " ,");
327  if (*sep) {
328  next = sep + 1;
329  *sep = '\0';
330  }
331  if (match_host_pattern(start, hostname)) {
332  ret = 1;
333  break;
334  }
335  start = next;
336  }
337  av_free(buf);
338  return ret;
339 }
#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:287
AVIOInterruptCB interrupt_callback
Definition: url.h:47
Convenience header that includes libavutil's core.
void ff_network_close(void)
Definition: network.c:106
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:149
int ff_socket(int af, int type, int proto)
Definition: network.c:170
int ff_network_inited_globally
Definition: network.c:57
#define IN6_IS_ADDR_MULTICAST(a)
Definition: network.h:235
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:106
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:230
int ff_network_init(void)
Definition: network.c:59
int ff_openssl_init(void)
Definition: tls_openssl.c:69
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:194
void ff_gnutls_init(void)
Definition: tls_gnutls.c:56
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:242
#define av_log(a,...)
Callback for checking whether to abort blocking functions.
Definition: avio.h:58
#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:212
const AVIOInterruptCB int_cb
Definition: ffmpeg.c:474
#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:135
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:86
#define ff_neterrno()
Definition: network.h:65
int ff_http_match_no_proxy(const char *no_proxy, const char *hostname)
Definition: network.c:311
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:251
int ff_check_interrupt(AVIOInterruptCB *cb)
Check if the user has requested to interrupt a blocking function associated with cb.
Definition: avio.c:662
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:232
#define POLLING_TIME
Definition: network.h:240
void ff_gnutls_deinit(void)
Definition: tls_gnutls.c:67
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:45
int ff_network_wait_fd(int fd, int write)
Definition: network.c:77
void INT64 start
Definition: avisynth_c.h:690
void ff_openssl_deinit(void)
Definition: tls_openssl.c:99
unbuffered private I/O API
#define MAKEWORD(a, b)
Definition: windows2linux.h:56