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  1. /*
  2.  * Unix socket protocol
  3.  * Copyright (c) 2013 Luca Barbato
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  *
  25.  * Unix socket url_protocol
  26.  *
  27.  */
  28.  
  29. #include "libavutil/avstring.h"
  30. #include "libavutil/opt.h"
  31. #include "os_support.h"
  32. #include "network.h"
  33. #include <sys/un.h>
  34. #include "url.h"
  35.  
  36. typedef struct UnixContext {
  37.     const AVClass *class;
  38.     struct sockaddr_un addr;
  39.     int timeout;
  40.     int listen;
  41.     int type;
  42.     int fd;
  43. } UnixContext;
  44.  
  45. #define OFFSET(x) offsetof(UnixContext, x)
  46. #define ED AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_ENCODING_PARAM
  47. static const AVOption unix_options[] = {
  48.     { "listen",    "Open socket for listening",             OFFSET(listen),  AV_OPT_TYPE_INT,   { .i64 = 0 },                    0,       1, ED },
  49.     { "timeout",   "Timeout in ms",                         OFFSET(timeout), AV_OPT_TYPE_INT,   { .i64 = -1 },                  -1, INT_MAX, ED },
  50.     { "type",      "Socket type",                           OFFSET(type),    AV_OPT_TYPE_INT,   { .i64 = SOCK_STREAM },    INT_MIN, INT_MAX, ED, "type" },
  51.     { "stream",    "Stream (reliable stream-oriented)",     0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_STREAM },    INT_MIN, INT_MAX, ED, "type" },
  52.     { "datagram",  "Datagram (unreliable packet-oriented)", 0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_DGRAM },     INT_MIN, INT_MAX, ED, "type" },
  53.     { "seqpacket", "Seqpacket (reliable packet-oriented",   0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_SEQPACKET }, INT_MIN, INT_MAX, ED, "type" },
  54.     { NULL }
  55. };
  56.  
  57. static const AVClass unix_class = {
  58.     .class_name = "unix",
  59.     .item_name  = av_default_item_name,
  60.     .option     = unix_options,
  61.     .version    = LIBAVUTIL_VERSION_INT,
  62. };
  63.  
  64. static int unix_open(URLContext *h, const char *filename, int flags)
  65. {
  66.     UnixContext *s = h->priv_data;
  67.     int fd, ret;
  68.  
  69.     av_strstart(filename, "unix:", &filename);
  70.     s->addr.sun_family = AF_UNIX;
  71.     av_strlcpy(s->addr.sun_path, filename, sizeof(s->addr.sun_path));
  72.  
  73.     if ((fd = ff_socket(AF_UNIX, s->type, 0)) < 0)
  74.         return ff_neterrno();
  75.  
  76.     if (s->listen) {
  77.         fd = ff_listen_bind(fd, (struct sockaddr *)&s->addr,
  78.                             sizeof(s->addr), s->timeout, h);
  79.         if (fd < 0) {
  80.             ret = fd;
  81.             goto fail;
  82.         }
  83.     } else {
  84.         ret = ff_listen_connect(fd, (struct sockaddr *)&s->addr,
  85.                                 sizeof(s->addr), s->timeout, h, 0);
  86.         if (ret < 0)
  87.             goto fail;
  88.     }
  89.  
  90.     s->fd = fd;
  91.  
  92.     return 0;
  93.  
  94. fail:
  95.     if (s->listen && AVUNERROR(ret) != EADDRINUSE)
  96.         unlink(s->addr.sun_path);
  97.     if (fd >= 0)
  98.         closesocket(fd);
  99.     return ret;
  100. }
  101.  
  102. static int unix_read(URLContext *h, uint8_t *buf, int size)
  103. {
  104.     UnixContext *s = h->priv_data;
  105.     int ret;
  106.  
  107.     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
  108.         ret = ff_network_wait_fd(s->fd, 0);
  109.         if (ret < 0)
  110.             return ret;
  111.     }
  112.     ret = recv(s->fd, buf, size, 0);
  113.     return ret < 0 ? ff_neterrno() : ret;
  114. }
  115.  
  116. static int unix_write(URLContext *h, const uint8_t *buf, int size)
  117. {
  118.     UnixContext *s = h->priv_data;
  119.     int ret;
  120.  
  121.     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
  122.         ret = ff_network_wait_fd(s->fd, 1);
  123.         if (ret < 0)
  124.             return ret;
  125.     }
  126.     ret = send(s->fd, buf, size, 0);
  127.     return ret < 0 ? ff_neterrno() : ret;
  128. }
  129.  
  130. static int unix_close(URLContext *h)
  131. {
  132.     UnixContext *s = h->priv_data;
  133.     if (s->listen)
  134.         unlink(s->addr.sun_path);
  135.     closesocket(s->fd);
  136.     return 0;
  137. }
  138.  
  139. static int unix_get_file_handle(URLContext *h)
  140. {
  141.     UnixContext *s = h->priv_data;
  142.     return s->fd;
  143. }
  144.  
  145. URLProtocol ff_unix_protocol = {
  146.     .name                = "unix",
  147.     .url_open            = unix_open,
  148.     .url_read            = unix_read,
  149.     .url_write           = unix_write,
  150.     .url_close           = unix_close,
  151.     .url_get_file_handle = unix_get_file_handle,
  152.     .priv_data_size      = sizeof(UnixContext),
  153.     .priv_data_class     = &unix_class,
  154.     .flags               = URL_PROTOCOL_FLAG_NETWORK,
  155. };
  156.