libavformat/os_support.c

   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 "libavutil/mem.h"
  29 #include "avformat.h"
  30 #include "os_support.h"
  31
  32 #if CONFIG_NETWORK
  33 #include <fcntl.h>
  34 #if !HAVE_POLL_H
  35 #if HAVE_SYS_TIME_H
  36 #include <sys/time.h>
  37 #endif /* HAVE_SYS_TIME_H */
  38 #if HAVE_SYS_SELECT_H
  39 #include <sys/select.h>
  40 #endif /* HAVE_SYS_SELECT_H */
  41 #endif /* !HAVE_POLL_H */
  42
  43 #include "network.h"
  44
  45 #if !HAVE_GETADDRINFO
  46 #if !HAVE_INET_ATON
  47 #include <stdlib.h>
  48
  49 static int inet_aton(const char *str, struct in_addr *add)
  50 {
  51     unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
  52
  53     if (sscanf(str, "%d.%d.%d.%d", &add1, &add2, &add3, &add4) != 4)
  54         return 0;
  55
  56     if (!add1 || (add1 | add2 | add3 | add4) > 255)
  57         return 0;
  58
  59     add->s_addr = htonl((add1 << 24) + (add2 << 16) + (add3 << 8) + add4);
  60
  61     return 1;
  62 }
  63 #endif /* !HAVE_INET_ATON */
  64
  65 int ff_getaddrinfo(const char *node, const char *service,
  66                    const struct addrinfo *hints, struct addrinfo **res)
  67 {
  68     struct hostent *h = NULL;
  69     struct addrinfo *ai;
  70     struct sockaddr_in *sin;
  71
  72     *res = NULL;
  73     sin  = av_mallocz(sizeof(struct sockaddr_in));
  74     if (!sin)
  75         return EAI_FAIL;
  76     sin->sin_family = AF_INET;
  77
  78     if (node) {
  79         if (!inet_aton(node, &sin->sin_addr)) {
  80             if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
  81                 av_free(sin);
  82                 return EAI_FAIL;
  83             }
  84             h = gethostbyname(node);
  85             if (!h) {
  86                 av_free(sin);
  87                 return EAI_FAIL;
  88             }
  89             memcpy(&sin->sin_addr, h->h_addr_list[0], sizeof(struct in_addr));
  90         }
  91     } else {
  92         if (hints && (hints->ai_flags & AI_PASSIVE))
  93             sin->sin_addr.s_addr = INADDR_ANY;
  94         else
  95             sin->sin_addr.s_addr = INADDR_LOOPBACK;
  96     }
  97
  98     /* Note: getaddrinfo allows service to be a string, which
  99      * should be looked up using getservbyname. */
 100     if (service)
 101         sin->sin_port = htons(atoi(service));
 102
 103     ai = av_mallocz(sizeof(struct addrinfo));
 104     if (!ai) {
 105         av_free(sin);
 106         return EAI_FAIL;
 107     }
 108
 109     *res            = ai;
 110     ai->ai_family   = AF_INET;
 111     ai->ai_socktype = hints ? hints->ai_socktype : 0;
 112     switch (ai->ai_socktype) {
 113     case SOCK_STREAM:
 114         ai->ai_protocol = IPPROTO_TCP;
 115         break;
 116     case SOCK_DGRAM:
 117         ai->ai_protocol = IPPROTO_UDP;
 118         break;
 119     default:
 120         ai->ai_protocol = 0;
 121         break;
 122     }
 123
 124     ai->ai_addr    = (struct sockaddr *)sin;
 125     ai->ai_addrlen = sizeof(struct sockaddr_in);
 126     if (hints && (hints->ai_flags & AI_CANONNAME))
 127         ai->ai_canonname = h ? av_strdup(h->h_name) : NULL;
 128
 129     ai->ai_next = NULL;
 130     return 0;
 131 }
 132
 133 void ff_freeaddrinfo(struct addrinfo *res)
 134 {
 135     av_freep(&res->ai_canonname);
 136     av_freep(&res->ai_addr);
 137     av_freep(&res);
 138 }
 139
 140 int ff_getnameinfo(const struct sockaddr *sa, int salen,
 141                    char *host, int hostlen,
 142                    char *serv, int servlen, int flags)
 143 {
 144     const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 145
 146     if (sa->sa_family != AF_INET)
 147         return EAI_FAMILY;
 148     if (!host && !serv)
 149         return EAI_NONAME;
 150
 151     if (host && hostlen > 0) {
 152         struct hostent *ent = NULL;
 153         uint32_t a;
 154         if (!(flags & NI_NUMERICHOST))
 155             ent = gethostbyaddr((const char *)&sin->sin_addr,
 156                                 sizeof(sin->sin_addr), AF_INET);
 157
 158         if (ent) {
 159             snprintf(host, hostlen, "%s", ent->h_name);
 160         } else if (flags & NI_NAMERQD) {
 161             return EAI_NONAME;
 162         } else {
 163             a = ntohl(sin->sin_addr.s_addr);
 164             snprintf(host, hostlen, "%d.%d.%d.%d",
 165                      ((a >> 24) & 0xff), ((a >> 16) & 0xff),
 166                      ((a >>  8) & 0xff),  (a        & 0xff));
 167         }
 168     }
 169
 170     if (serv && servlen > 0) {
 171         if (!(flags & NI_NUMERICSERV))
 172             return EAI_FAIL;
 173         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
 174     }
 175
 176     return 0;
 177 }
 178 #endif /* !HAVE_GETADDRINFO */
 179
 180 #if !HAVE_GETADDRINFO || HAVE_WINSOCK2_H
 181 const char *ff_gai_strerror(int ecode)
 182 {
 183     switch (ecode) {
 184     case EAI_AGAIN:
 185         return "Temporary failure in name resolution";
 186     case EAI_BADFLAGS:
 187         return "Invalid flags for ai_flags";
 188     case EAI_FAIL:
 189         return "A non-recoverable error occurred";
 190     case EAI_FAMILY:
 191         return "The address family was not recognized or the address "
 192                "length was invalid for the specified family";
 193     case EAI_MEMORY:
 194         return "Memory allocation failure";
 195 #if EAI_NODATA != EAI_NONAME
 196     case EAI_NODATA:
 197         return "No address associated with hostname";
 198 #endif /* EAI_NODATA != EAI_NONAME */
 199     case EAI_NONAME:
 200         return "The name does not resolve for the supplied parameters";
 201     case EAI_SERVICE:
 202         return "servname not supported for ai_socktype";
 203     case EAI_SOCKTYPE:
 204         return "ai_socktype not supported";
 205     }
 206
 207     return "Unknown error";
 208 }
 209 #endif /* !HAVE_GETADDRINFO || HAVE_WINSOCK2_H */
 210
 211 int ff_socket_nonblock(int socket, int enable)
 212 {
 213 #if HAVE_WINSOCK2_H
 214     u_long param = enable;
 215     return ioctlsocket(socket, FIONBIO, &param);
 216 #else
 217     if (enable)
 218         return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) | O_NONBLOCK);
 219     else
 220         return fcntl(socket, F_SETFL, fcntl(socket, F_GETFL) & ~O_NONBLOCK);
 221 #endif /* HAVE_WINSOCK2_H */
 222 }
 223
 224 #if !HAVE_POLL_H
 225 int ff_poll(struct pollfd *fds, nfds_t numfds, int timeout)
 226 {
 227     fd_set read_set;
 228     fd_set write_set;
 229     fd_set exception_set;
 230     nfds_t i;
 231     int n;
 232     int rc;
 233
 234 #if HAVE_WINSOCK2_H
 235     if (numfds >= FD_SETSIZE) {
 236         errno = EINVAL;
 237         return -1;
 238     }
 239 #endif /* HAVE_WINSOCK2_H */
 240
 241     FD_ZERO(&read_set);
 242     FD_ZERO(&write_set);
 243     FD_ZERO(&exception_set);
 244
 245     n = 0;
 246     for (i = 0; i < numfds; i++) {
 247 #if !HAVE_WINSOCK2_H
 248         if (fds[i].fd < 0)
 249             continue;
 250         if (fds[i].fd >= FD_SETSIZE) {
 251             errno = EINVAL;
 252             return -1;
 253         }
 254 #else
 255         if (fds[i].fd == INVALID_SOCKET)
 256             continue;
 257 #endif /* !HAVE_WINSOCK2_H */
 258
 259         if (fds[i].events & POLLIN)
 260             FD_SET(fds[i].fd, &read_set);
 261         if (fds[i].events & POLLOUT)
 262             FD_SET(fds[i].fd, &write_set);
 263         if (fds[i].events & POLLERR)
 264             FD_SET(fds[i].fd, &exception_set);
 265
 266         if (fds[i].fd >= n)
 267             n = fds[i].fd + 1;
 268     }
 269
 270     if (n == 0)
 271         /* Hey!? Nothing to poll, in fact!!! */
 272         return 0;
 273
 274     if (timeout < 0) {
 275         rc = select(n, &read_set, &write_set, &exception_set, NULL);
 276     } else {
 277         struct timeval tv;
 278         tv.tv_sec  = timeout / 1000;
 279         tv.tv_usec = 1000 * (timeout % 1000);
 280         rc         = select(n, &read_set, &write_set, &exception_set, &tv);
 281     }
 282
 283     if (rc < 0)
 284         return rc;
 285
 286     for (i = 0; i < numfds; i++) {
 287         fds[i].revents = 0;
 288
 289         if (FD_ISSET(fds[i].fd, &read_set))
 290             fds[i].revents |= POLLIN;
 291         if (FD_ISSET(fds[i].fd, &write_set))
 292             fds[i].revents |= POLLOUT;
 293         if (FD_ISSET(fds[i].fd, &exception_set))
 294             fds[i].revents |= POLLERR;
 295     }
 296
 297     return rc;
 298 }
 299 #endif /* !HAVE_POLL_H */
 300
 301 #endif /* CONFIG_NETWORK */