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
unix_open(URLContext * h,const char * filename,int flags)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, h)) < 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
unix_read(URLContext * h,uint8_t * buf,int size)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 if (!ret && s->type == SOCK_STREAM)
115 return AVERROR_EOF;
116 return ret < 0 ? ff_neterrno() : ret;
117 }
118
unix_write(URLContext * h,const uint8_t * buf,int size)119 static int unix_write(URLContext *h, const uint8_t *buf, int size)
120 {
121 UnixContext *s = h->priv_data;
122 int ret;
123
124 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
125 ret = ff_network_wait_fd(s->fd, 1);
126 if (ret < 0)
127 return ret;
128 }
129 ret = send(s->fd, buf, size, MSG_NOSIGNAL);
130 return ret < 0 ? ff_neterrno() : ret;
131 }
132
unix_close(URLContext * h)133 static int unix_close(URLContext *h)
134 {
135 UnixContext *s = h->priv_data;
136 if (s->listen)
137 unlink(s->addr.sun_path);
138 closesocket(s->fd);
139 return 0;
140 }
141
unix_get_file_handle(URLContext * h)142 static int unix_get_file_handle(URLContext *h)
143 {
144 UnixContext *s = h->priv_data;
145 return s->fd;
146 }
147
148 const URLProtocol ff_unix_protocol = {
149 .name = "unix",
150 .url_open = unix_open,
151 .url_read = unix_read,
152 .url_write = unix_write,
153 .url_close = unix_close,
154 .url_get_file_handle = unix_get_file_handle,
155 .priv_data_size = sizeof(UnixContext),
156 .priv_data_class = &unix_class,
157 .flags = URL_PROTOCOL_FLAG_NETWORK,
158 };
159