FFmpeg
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 _DEFAULT_SOURCE
25 #define _SVID_SOURCE
26 
27 #include "config.h"
28 #include "avformat.h"
29 #include "os_support.h"
30 
31 #if CONFIG_NETWORK
32 #include <fcntl.h>
33 #if !HAVE_POLL_H
34 #if HAVE_SYS_TIME_H
35 #include <sys/time.h>
36 #endif /* HAVE_SYS_TIME_H */
37 #if HAVE_WINSOCK2_H
38 #include <winsock2.h>
39 #elif HAVE_SYS_SELECT_H
40 #include <sys/select.h>
41 #endif /* HAVE_WINSOCK2_H */
42 #endif /* !HAVE_POLL_H */
43 
44 #include "network.h"
45 
46 #if !HAVE_GETADDRINFO
47 #if !HAVE_INET_ATON
48 #include <stdlib.h>
49 
50 static int inet_aton(const char *str, struct in_addr *add)
51 {
52  unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
53 
54  if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
55  return 0;
56 
57  if (!add1 || (add1 | add2 | add3 | add4) > 255)
58  return 0;
59 
60  add->s_addr = htonl((add1 << 24) + (add2 << 16) + (add3 << 8) + add4);
61 
62  return 1;
63 }
64 #endif /* !HAVE_INET_ATON */
65 
66 int ff_getaddrinfo(const char *node, const char *service,
67  const struct addrinfo *hints, struct addrinfo **res)
68 {
69  struct hostent *h = NULL;
70  struct addrinfo *ai;
71  struct sockaddr_in *sin;
72 
73  *res = NULL;
74  sin = av_mallocz(sizeof(struct sockaddr_in));
75  if (!sin)
76  return EAI_FAIL;
77  sin->sin_family = AF_INET;
78 
79  if (node) {
80  if (!inet_aton(node, &sin->sin_addr)) {
81  if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
82  av_free(sin);
83  return EAI_FAIL;
84  }
85  h = gethostbyname(node);
86  if (!h) {
87  av_free(sin);
88  return EAI_FAIL;
89  }
90  memcpy(&sin->sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
91  }
92  } else {
93  if (hints && (hints->ai_flags & AI_PASSIVE))
94  sin->sin_addr.s_addr = INADDR_ANY;
95  else
96  sin->sin_addr.s_addr = INADDR_LOOPBACK;
97  }
98 
99  /* Note: getaddrinfo allows service to be a string, which
100  * should be looked up using getservbyname. */
101  if (service)
102  sin->sin_port = htons(atoi(service));
103 
104  ai = av_mallocz(sizeof(struct addrinfo));
105  if (!ai) {
106  av_free(sin);
107  return EAI_FAIL;
108  }
109 
110  *res = ai;
111  ai->ai_family = AF_INET;
112  ai->ai_socktype = hints ? hints->ai_socktype : 0;
113  switch (ai->ai_socktype) {
114  case SOCK_STREAM:
115  ai->ai_protocol = IPPROTO_TCP;
116  break;
117  case SOCK_DGRAM:
118  ai->ai_protocol = IPPROTO_UDP;
119  break;
120  default:
121  ai->ai_protocol = 0;
122  break;
123  }
124 
125  ai->ai_addr = (struct sockaddr *)sin;
126  ai->ai_addrlen = sizeof(struct sockaddr_in);
127  if (hints && (hints->ai_flags & AI_CANONNAME))
128  ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;
129 
130  ai->ai_next = NULL;
131  return 0;
132 }
133 
134 void ff_freeaddrinfo(struct addrinfo *res)
135 {
136  av_freep(&res->ai_canonname);
137  av_freep(&res->ai_addr);
138  av_freep(&res);
139 }
140 
141 int ff_getnameinfo(const struct sockaddr *sa, int salen,
142  char *host, int hostlen,
143  char *serv, int servlen, int flags)
144 {
145  const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
146 
147  if (sa->sa_family != AF_INET)
148  return EAI_FAMILY;
149  if (!host && !serv)
150  return EAI_NONAME;
151 
152  if (host && hostlen > 0) {
153  struct hostent *ent = NULL;
154  uint32_t a;
155  if (!(flags & NI_NUMERICHOST))
156  ent = gethostbyaddr((const char *)&sin->sin_addr,
157  sizeof(sin->sin_addr), AF_INET);
158 
159  if (ent) {
160  snprintf(host, hostlen, "%s", ent->h_name);
161  } else if (flags & NI_NAMERQD) {
162  return EAI_NONAME;
163  } else {
164  a = ntohl(sin->sin_addr.s_addr);
165  snprintf(host, hostlen, "%d.%d.%d.%d",
166  ((a >> 24) & 0xff), ((a >> 16) & 0xff),
167  ((a >> 8) & 0xff), (a & 0xff));
168  }
169  }
170 
171  if (serv && servlen > 0) {
172  if (!(flags & NI_NUMERICSERV))
173  return EAI_FAIL;
174  snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
175  }
176 
177  return 0;
178 }
179 #endif /* !HAVE_GETADDRINFO */
180 
181 #if !HAVE_GETADDRINFO || HAVE_WINSOCK2_H
182 const char *ff_gai_strerror(int ecode)
183 {
184  switch (ecode) {
185  case EAI_AGAIN:
186  return "Temporary failure in name resolution";
187  case EAI_BADFLAGS:
188  return "Invalid flags for ai_flags";
189  case EAI_FAIL:
190  return "A non-recoverable error occurred";
191  case EAI_FAMILY:
192  return "The address family was not recognized or the address "
193  "length was invalid for the specified family";
194  case EAI_MEMORY:
195  return "Memory allocation failure";
196 #if EAI_NODATA != EAI_NONAME
197  case EAI_NODATA:
198  return "No address associated with hostname";
199 #endif /* EAI_NODATA != EAI_NONAME */
200  case EAI_NONAME:
201  return "The name does not resolve for the supplied parameters";
202  case EAI_SERVICE:
203  return "servname not supported for ai_socktype";
204  case EAI_SOCKTYPE:
205  return "ai_socktype not supported";
206  }
207 
208  return "Unknown error";
209 }
210 #endif /* !HAVE_GETADDRINFO || HAVE_WINSOCK2_H */
211 
212 int ff_socket_nonblock(int socket, int enable)
213 {
214 #if HAVE_WINSOCK2_H
215  u_long param = enable;
216  return ioctlsocket(socket, FIONBIO, &param);
217 #else
218  if (enable)
219  return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
220  else
221  return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
222 #endif /* HAVE_WINSOCK2_H */
223 }
224 
225 #if !HAVE_POLL_H
226 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout)
227 {
228  fd_set read_set;
229  fd_set write_set;
230  fd_set exception_set;
231  nfds_t i;
232  int n;
233  int rc;
234 
235 #if HAVE_WINSOCK2_H
236  if (numfds >= FD_SETSIZE) {
237  errno = EINVAL;
238  return -1;
239  }
240 #endif /* HAVE_WINSOCK2_H */
241 
242  FD_ZERO(&read_set);
243  FD_ZERO(&write_set);
244  FD_ZERO(&exception_set);
245 
246  n = 0;
247  for (i = 0; i < numfds; i++) {
248  if (fds[i].fd < 0)
249  continue;
250 #if !HAVE_WINSOCK2_H
251  if (fds[i].fd >= FD_SETSIZE) {
252  errno = EINVAL;
253  return -1;
254  }
255 #endif /* !HAVE_WINSOCK2_H */
256 
257  if (fds[i].events & POLLIN)
258  FD_SET(fds[i].fd, &read_set);
259  if (fds[i].events & POLLOUT)
260  FD_SET(fds[i].fd, &write_set);
261  if (fds[i].events & POLLERR)
262  FD_SET(fds[i].fd, &exception_set);
263 
264  if (fds[i].fd >= n)
265  n = fds[i].fd + 1;
266  }
267 
268  if (n == 0)
269  /* Hey!? Nothing to poll, in fact!!! */
270  return 0;
271 
272  if (timeout < 0) {
273  rc = select(n, &read_set, &write_set, &exception_set, NULL);
274  } else {
275  struct timeval tv;
276  tv.tv_sec = timeout / 1000;
277  tv.tv_usec = 1000 * (timeout % 1000);
278  rc = select(n, &read_set, &write_set, &exception_set, &tv);
279  }
280 
281  if (rc < 0)
282  return rc;
283 
284  for (i = 0; i < numfds; i++) {
285  fds[i].revents = 0;
286 
287  if (FD_ISSET(fds[i].fd, &read_set))
288  fds[i].revents |= POLLIN;
289  if (FD_ISSET(fds[i].fd, &write_set))
290  fds[i].revents |= POLLOUT;
291  if (FD_ISSET(fds[i].fd, &exception_set))
292  fds[i].revents |= POLLERR;
293  }
294 
295  return rc;
296 }
297 #endif /* !HAVE_POLL_H */
298 
299 #endif /* CONFIG_NETWORK */
#define NULL
Definition: coverity.c:32
#define NI_NUMERICSERV
Definition: network.h:200
#define EAI_MEMORY
Definition: network.h:160
#define AI_PASSIVE
Definition: network.h:176
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
#define EAI_NODATA
Definition: network.h:163
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
int ff_getnameinfo(const struct sockaddr *sa, int salen, char *host, int hostlen, char *serv, int servlen, int flags)
#define AI_NUMERICHOST
Definition: network.h:184
#define EAI_BADFLAGS
Definition: network.h:151
#define NI_NAMERQD
Definition: network.h:196
miscellaneous OS support macros and functions.
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
const char * ff_gai_strerror(int ecode)
char * ai_canonname
Definition: network.h:141
#define INADDR_LOOPBACK
Definition: network.h:226
void ff_freeaddrinfo(struct addrinfo *res)
int ai_addrlen
Definition: network.h:139
#define NI_NUMERICHOST
Definition: network.h:192
#define EAI_FAMILY
Definition: network.h:157
int n
Definition: avisynth_c.h:760
#define EAI_NONAME
Definition: network.h:166
int ff_socket_nonblock(int socket, int enable)
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
#define EAI_AGAIN
Definition: network.h:148
int ai_protocol
Definition: network.h:138
#define snprintf
Definition: snprintf.h:34
int ai_socktype
Definition: network.h:137
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define EAI_FAIL
Definition: network.h:154
Main libavformat public API header.
#define AI_CANONNAME
Definition: network.h:180
struct addrinfo * ai_next
Definition: network.h:142
#define EAI_SOCKTYPE
Definition: network.h:172
#define av_free(p)
#define EAI_SERVICE
Definition: network.h:169
int ff_getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res)
int ai_flags
Definition: network.h:135
#define av_freep(p)
struct sockaddr * ai_addr
Definition: network.h:140
int ai_family
Definition: network.h:136