libavformat/unix.c

   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 #include "libavutil/avstring.h"
  29 #include "libavutil/opt.h"
  30 #include "os_support.h"
  31 #include "network.h"
  32 #include <sys/un.h>
  33 #include "url.h"
  34
  35 typedef struct UnixContext {
  36     const AVClass *class;
  37     struct sockaddr_un addr;
  38     int timeout;
  39     int listen;
  40     int type;
  41     int fd;
  42 } UnixContext;
  43
  44 #define OFFSET(x) offsetof(UnixContext, x)
  45 #define ED AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_ENCODING_PARAM
  46 static const AVOption unix_options[] = {
  47     { "listen",    "Open socket for listening",             OFFSET(listen),  AV_OPT_TYPE_BOOL,  { .i64 = 0 },                    0,       1, ED },
  48     { "timeout",   "Timeout in ms",                         OFFSET(timeout), AV_OPT_TYPE_INT,   { .i64 = -1 },                  -1, INT_MAX, ED },
  49     { "type",      "Socket type",                           OFFSET(type),    AV_OPT_TYPE_INT,   { .i64 = SOCK_STREAM },    INT_MIN, INT_MAX, ED, "type" },
  50     { "stream",    "Stream (reliable stream-oriented)",     0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_STREAM },    INT_MIN, INT_MAX, ED, "type" },
  51     { "datagram",  "Datagram (unreliable packet-oriented)", 0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_DGRAM },     INT_MIN, INT_MAX, ED, "type" },
  52     { "seqpacket", "Seqpacket (reliable packet-oriented",   0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_SEQPACKET }, INT_MIN, INT_MAX, ED, "type" },
  53     { NULL }
  54 };
  55
  56 static const AVClass unix_class = {
  57     .class_name = "unix",
  58     .item_name  = av_default_item_name,
  59     .option     = unix_options,
  60     .version    = LIBAVUTIL_VERSION_INT,
  61 };
  62
  63 static int unix_open(URLContext *h, const char *filename, int flags)
  64 {
  65     UnixContext *s = h->priv_data;
  66     int fd, ret;
  67
  68     av_strstart(filename, "unix:", &filename);
  69     s->addr.sun_family = AF_UNIX;
  70     av_strlcpy(s->addr.sun_path, filename, sizeof(s->addr.sun_path));
  71
  72     if ((fd = ff_socket(AF_UNIX, s->type, 0)) < 0)
  73         return ff_neterrno();
  74
  75     if (s->timeout < 0 && h->rw_timeout)
  76         s->timeout = h->rw_timeout / 1000;
  77
  78     if (s->listen) {
  79         ret = ff_listen_bind(fd, (struct sockaddr *)&s->addr,
  80                              sizeof(s->addr), s->timeout, h);
  81         if (ret < 0)
  82             goto fail;
  83         fd = ret;
  84     } else {
  85         ret = ff_listen_connect(fd, (struct sockaddr *)&s->addr,
  86                                 sizeof(s->addr), s->timeout, h, 0);
  87         if (ret < 0)
  88             goto fail;
  89     }
  90
  91     s->fd = fd;
  92
  93     return 0;
  94
  95 fail:
  96     if (s->listen && AVUNERROR(ret) != EADDRINUSE)
  97         unlink(s->addr.sun_path);
  98     if (fd >= 0)
  99         closesocket(fd);
 100     return ret;
 101 }
 102
 103 static int unix_read(URLContext *h, uint8_t *buf, int size)
 104 {
 105     UnixContext *s = h->priv_data;
 106     int ret;
 107
 108     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
 109         ret = ff_network_wait_fd(s->fd, 0);
 110         if (ret < 0)
 111             return ret;
 112     }
 113     ret = recv(s->fd, buf, size, 0);
 114     return ret < 0 ? ff_neterrno() : ret;
 115 }
 116
 117 static int unix_write(URLContext *h, const uint8_t *buf, int size)
 118 {
 119     UnixContext *s = h->priv_data;
 120     int ret;
 121
 122     if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
 123         ret = ff_network_wait_fd(s->fd, 1);
 124         if (ret < 0)
 125             return ret;
 126     }
 127     ret = send(s->fd, buf, size, MSG_NOSIGNAL);
 128     return ret < 0 ? ff_neterrno() : ret;
 129 }
 130
 131 static int unix_close(URLContext *h)
 132 {
 133     UnixContext *s = h->priv_data;
 134     if (s->listen)
 135         unlink(s->addr.sun_path);
 136     closesocket(s->fd);
 137     return 0;
 138 }
 139
 140 static int unix_get_file_handle(URLContext *h)
 141 {
 142     UnixContext *s = h->priv_data;
 143     return s->fd;
 144 }
 145
 146 const URLProtocol ff_unix_protocol = {
 147     .name                = "unix",
 148     .url_open            = unix_open,
 149     .url_read            = unix_read,
 150     .url_write           = unix_write,
 151     .url_close           = unix_close,
 152     .url_get_file_handle = unix_get_file_handle,
 153     .priv_data_size      = sizeof(UnixContext),
 154     .priv_data_class     = &unix_class,
 155     .flags               = URL_PROTOCOL_FLAG_NETWORK,
 156 };