| 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, MSG_NOSIGNAL); |
| 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 | }; |