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os_support.c
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1 /*
2  * various OS-feature replacement utilities
3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  * copyright (c) 2002 Francois Revol
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /* needed by inet_aton() */
24 #define _SVID_SOURCE
25 
26 #include "config.h"
27 #include "avformat.h"
28 #include "os_support.h"
29 
30 #if defined(_WIN32) && !defined(__MINGW32CE__)
31 #undef open
32 #include <fcntl.h>
33 #include <io.h>
34 #include <windows.h>
35 #include <share.h>
36 
37 int ff_win32_open(const char *filename_utf8, int oflag, int pmode)
38 {
39  int fd;
40  int num_chars;
41  wchar_t *filename_w;
42 
43  /* convert UTF-8 to wide chars */
44  num_chars = MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, NULL, 0);
45  if (num_chars <= 0)
46  return -1;
47  filename_w = av_mallocz(sizeof(wchar_t) * num_chars);
48  MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, filename_w, num_chars);
49 
50  fd = _wsopen(filename_w, oflag, SH_DENYNO, pmode);
51  av_freep(&filename_w);
52 
53  /* filename maybe be in CP_ACP */
54  if (fd == -1 && !(oflag & O_CREAT))
55  return _sopen(filename_utf8, oflag, SH_DENYNO, pmode);
56 
57  return fd;
58 }
59 #endif
60 
61 #if CONFIG_NETWORK
62 #include <fcntl.h>
63 #if !HAVE_POLL_H
64 #if HAVE_SYS_TIME_H
65 #include <sys/time.h>
66 #endif
67 #if HAVE_WINSOCK2_H
68 #include <winsock2.h>
69 #elif HAVE_SYS_SELECT_H
70 #include <sys/select.h>
71 #endif
72 #endif
73 
74 #include "network.h"
75 
76 #if !HAVE_INET_ATON
77 #include <stdlib.h>
78 
79 int ff_inet_aton(const char *str, struct in_addr *add)
80 {
81  unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
82 
83  if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
84  return 0;
85 
86  if (!add1 || (add1 | add2 | add3 | add4) > 255)
87  return 0;
88 
89  add->s_addr = htonl((add1 << 24) + (add2 << 16) + (add3 << 8) + add4);
90 
91  return 1;
92 }
93 #else
94 int ff_inet_aton(const char *str, struct in_addr *add)
95 {
96  return inet_aton(str, add);
97 }
98 #endif /* !HAVE_INET_ATON */
99 
100 #if !HAVE_GETADDRINFO
101 int ff_getaddrinfo(const char *node, const char *service,
102  const struct addrinfo *hints, struct addrinfo **res)
103 {
104  struct hostent *h = NULL;
105  struct addrinfo *ai;
106  struct sockaddr_in *sin;
107 
108 #if HAVE_WINSOCK2_H
109  int (WSAAPI *win_getaddrinfo)(const char *node, const char *service,
110  const struct addrinfo *hints,
111  struct addrinfo **res);
112  HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
113  win_getaddrinfo = GetProcAddress(ws2mod, "getaddrinfo");
114  if (win_getaddrinfo)
115  return win_getaddrinfo(node, service, hints, res);
116 #endif
117 
118  *res = NULL;
119  sin = av_mallocz(sizeof(struct sockaddr_in));
120  if (!sin)
121  return EAI_FAIL;
122  sin->sin_family = AF_INET;
123 
124  if (node) {
125  if (!ff_inet_aton(node, &sin->sin_addr)) {
126  if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
127  av_free(sin);
128  return EAI_FAIL;
129  }
130  h = gethostbyname(node);
131  if (!h) {
132  av_free(sin);
133  return EAI_FAIL;
134  }
135  memcpy(&sin->sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
136  }
137  } else {
138  if (hints && (hints->ai_flags & AI_PASSIVE))
139  sin->sin_addr.s_addr = INADDR_ANY;
140  else
141  sin->sin_addr.s_addr = INADDR_LOOPBACK;
142  }
143 
144  /* Note: getaddrinfo allows service to be a string, which
145  * should be looked up using getservbyname. */
146  if (service)
147  sin->sin_port = htons(atoi(service));
148 
149  ai = av_mallocz(sizeof(struct addrinfo));
150  if (!ai) {
151  av_free(sin);
152  return EAI_FAIL;
153  }
154 
155  *res = ai;
156  ai->ai_family = AF_INET;
157  ai->ai_socktype = hints ? hints->ai_socktype : 0;
158  switch (ai->ai_socktype) {
159  case SOCK_STREAM:
160  ai->ai_protocol = IPPROTO_TCP;
161  break;
162  case SOCK_DGRAM:
163  ai->ai_protocol = IPPROTO_UDP;
164  break;
165  default:
166  ai->ai_protocol = 0;
167  break;
168  }
169 
170  ai->ai_addr = (struct sockaddr *)sin;
171  ai->ai_addrlen = sizeof(struct sockaddr_in);
172  if (hints && (hints->ai_flags & AI_CANONNAME))
173  ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;
174 
175  ai->ai_next = NULL;
176  return 0;
177 }
178 
179 void ff_freeaddrinfo(struct addrinfo *res)
180 {
181 #if HAVE_WINSOCK2_H
182  void (WSAAPI *win_freeaddrinfo)(struct addrinfo *res);
183  HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
184  win_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *res))
185  GetProcAddress(ws2mod, "freeaddrinfo");
186  if (win_freeaddrinfo) {
187  win_freeaddrinfo(res);
188  return;
189  }
190 #endif
191 
192  av_free(res->ai_canonname);
193  av_free(res->ai_addr);
194  av_free(res);
195 }
196 
197 int ff_getnameinfo(const struct sockaddr *sa, int salen,
198  char *host, int hostlen,
199  char *serv, int servlen, int flags)
200 {
201  const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
202 
203 #if HAVE_WINSOCK2_H
204  int (WSAAPI *win_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
205  char *host, DWORD hostlen,
206  char *serv, DWORD servlen, int flags);
207  HMODULE ws2mod = GetModuleHandle("ws2_32.dll");
208  win_getnameinfo = GetProcAddress(ws2mod, "getnameinfo");
209  if (win_getnameinfo)
210  return win_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
211 #endif
212 
213  if (sa->sa_family != AF_INET)
214  return EAI_FAMILY;
215  if (!host && !serv)
216  return EAI_NONAME;
217 
218  if (host && hostlen > 0) {
219  struct hostent *ent = NULL;
220  uint32_t a;
221  if (!(flags & NI_NUMERICHOST))
222  ent = gethostbyaddr((const char *)&sin->sin_addr,
223  sizeof(sin->sin_addr), AF_INET);
224 
225  if (ent) {
226  snprintf(host, hostlen, "%s", ent->h_name);
227  } else if (flags & NI_NAMERQD) {
228  return EAI_NONAME;
229  } else {
230  a = ntohl(sin->sin_addr.s_addr);
231  snprintf(host, hostlen, "%d.%d.%d.%d",
232  ((a >> 24) & 0xff), ((a >> 16) & 0xff),
233  ((a >> 8) & 0xff), (a & 0xff));
234  }
235  }
236 
237  if (serv && servlen > 0) {
238  struct servent *ent = NULL;
239 #if HAVE_GETSERVBYPORT
240  if (!(flags & NI_NUMERICSERV))
241  ent = getservbyport(sin->sin_port, flags & NI_DGRAM ? "udp" : "tcp");
242 #endif
243 
244  if (ent)
245  snprintf(serv, servlen, "%s", ent->s_name);
246  else
247  snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
248  }
249 
250  return 0;
251 }
252 #endif /* !HAVE_GETADDRINFO */
253 
254 #if !HAVE_GETADDRINFO || HAVE_WINSOCK2_H
255 const char *ff_gai_strerror(int ecode)
256 {
257  switch (ecode) {
258  case EAI_AGAIN:
259  return "Temporary failure in name resolution";
260  case EAI_BADFLAGS:
261  return "Invalid flags for ai_flags";
262  case EAI_FAIL:
263  return "A non-recoverable error occurred";
264  case EAI_FAMILY:
265  return "The address family was not recognized or the address "
266  "length was invalid for the specified family";
267  case EAI_MEMORY:
268  return "Memory allocation failure";
269 #if EAI_NODATA != EAI_NONAME
270  case EAI_NODATA:
271  return "No address associated with hostname";
272 #endif
273  case EAI_NONAME:
274  return "The name does not resolve for the supplied parameters";
275  case EAI_SERVICE:
276  return "servname not supported for ai_socktype";
277  case EAI_SOCKTYPE:
278  return "ai_socktype not supported";
279  }
280 
281  return "Unknown error";
282 }
283 #endif /* !HAVE_GETADDRINFO || HAVE_WINSOCK2_H */
284 
285 int ff_socket_nonblock(int socket, int enable)
286 {
287 #if HAVE_WINSOCK2_H
288  u_long param = enable;
289  return ioctlsocket(socket, FIONBIO, &param);
290 #else
291  if (enable)
292  return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
293  else
294  return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
295 #endif
296 }
297 
298 #if !HAVE_POLL_H
299 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout)
300 {
301  fd_set read_set;
302  fd_set write_set;
303  fd_set exception_set;
304  nfds_t i;
305  int n;
306  int rc;
307 
308 #if HAVE_WINSOCK2_H
309  if (numfds >= FD_SETSIZE) {
310  errno = EINVAL;
311  return -1;
312  }
313 #endif
314 
315  FD_ZERO(&read_set);
316  FD_ZERO(&write_set);
317  FD_ZERO(&exception_set);
318 
319  n = 0;
320  for (i = 0; i < numfds; i++) {
321  if (fds[i].fd < 0)
322  continue;
323 #if !HAVE_WINSOCK2_H
324  if (fds[i].fd >= FD_SETSIZE) {
325  errno = EINVAL;
326  return -1;
327  }
328 #endif
329 
330  if (fds[i].events & POLLIN)
331  FD_SET(fds[i].fd, &read_set);
332  if (fds[i].events & POLLOUT)
333  FD_SET(fds[i].fd, &write_set);
334  if (fds[i].events & POLLERR)
335  FD_SET(fds[i].fd, &exception_set);
336 
337  if (fds[i].fd >= n)
338  n = fds[i].fd + 1;
339  }
340 
341  if (n == 0)
342  /* Hey!? Nothing to poll, in fact!!! */
343  return 0;
344 
345  if (timeout < 0) {
346  rc = select(n, &read_set, &write_set, &exception_set, NULL);
347  } else {
348  struct timeval tv;
349  tv.tv_sec = timeout / 1000;
350  tv.tv_usec = 1000 * (timeout % 1000);
351  rc = select(n, &read_set, &write_set, &exception_set, &tv);
352  }
353 
354  if (rc < 0)
355  return rc;
356 
357  for (i = 0; i < numfds; i++) {
358  fds[i].revents = 0;
359 
360  if (FD_ISSET(fds[i].fd, &read_set))
361  fds[i].revents |= POLLIN;
362  if (FD_ISSET(fds[i].fd, &write_set))
363  fds[i].revents |= POLLOUT;
364  if (FD_ISSET(fds[i].fd, &exception_set))
365  fds[i].revents |= POLLERR;
366  }
367 
368  return rc;
369 }
370 #endif /* HAVE_POLL_H */
371 #endif /* CONFIG_NETWORK */