| 1 | /* |
| 2 | * TCP protocol |
| 3 | * Copyright (c) 2002 Fabrice Bellard |
| 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 | #include "avformat.h" |
| 22 | #include "libavutil/parseutils.h" |
| 23 | #include "libavutil/opt.h" |
| 24 | #include "libavutil/time.h" |
| 25 | #include "internal.h" |
| 26 | #include "network.h" |
| 27 | #include "os_support.h" |
| 28 | #include "url.h" |
| 29 | #if HAVE_POLL_H |
| 30 | #include <poll.h> |
| 31 | #endif |
| 32 | |
| 33 | typedef struct TCPContext { |
| 34 | const AVClass *class; |
| 35 | int fd; |
| 36 | int listen; |
| 37 | int open_timeout; |
| 38 | int rw_timeout; |
| 39 | int listen_timeout; |
| 40 | } TCPContext; |
| 41 | |
| 42 | #define OFFSET(x) offsetof(TCPContext, x) |
| 43 | #define D AV_OPT_FLAG_DECODING_PARAM |
| 44 | #define E AV_OPT_FLAG_ENCODING_PARAM |
| 45 | static const AVOption options[] = { |
| 46 | {"listen", "listen on port instead of connecting", OFFSET(listen), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E }, |
| 47 | {"timeout", "set timeout of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E }, |
| 48 | {"listen_timeout", "set connection awaiting timeout", OFFSET(listen_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E }, |
| 49 | {NULL} |
| 50 | }; |
| 51 | |
| 52 | static const AVClass tcp_context_class = { |
| 53 | .class_name = "tcp", |
| 54 | .item_name = av_default_item_name, |
| 55 | .option = options, |
| 56 | .version = LIBAVUTIL_VERSION_INT, |
| 57 | }; |
| 58 | |
| 59 | /* return non zero if error */ |
| 60 | static int tcp_open(URLContext *h, const char *uri, int flags) |
| 61 | { |
| 62 | struct addrinfo hints = { 0 }, *ai, *cur_ai; |
| 63 | int port, fd = -1; |
| 64 | TCPContext *s = h->priv_data; |
| 65 | const char *p; |
| 66 | char buf[256]; |
| 67 | int ret; |
| 68 | char hostname[1024],proto[1024],path[1024]; |
| 69 | char portstr[10]; |
| 70 | s->open_timeout = 5000000; |
| 71 | |
| 72 | av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), |
| 73 | &port, path, sizeof(path), uri); |
| 74 | if (strcmp(proto, "tcp")) |
| 75 | return AVERROR(EINVAL); |
| 76 | if (port <= 0 || port >= 65536) { |
| 77 | av_log(h, AV_LOG_ERROR, "Port missing in uri\n"); |
| 78 | return AVERROR(EINVAL); |
| 79 | } |
| 80 | p = strchr(uri, '?'); |
| 81 | if (p) { |
| 82 | if (av_find_info_tag(buf, sizeof(buf), "listen", p)) { |
| 83 | char *endptr = NULL; |
| 84 | s->listen = strtol(buf, &endptr, 10); |
| 85 | /* assume if no digits were found it is a request to enable it */ |
| 86 | if (buf == endptr) |
| 87 | s->listen = 1; |
| 88 | } |
| 89 | if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) { |
| 90 | s->rw_timeout = strtol(buf, NULL, 10); |
| 91 | } |
| 92 | if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) { |
| 93 | s->listen_timeout = strtol(buf, NULL, 10); |
| 94 | } |
| 95 | } |
| 96 | if (s->rw_timeout >= 0) { |
| 97 | s->open_timeout = |
| 98 | h->rw_timeout = s->rw_timeout; |
| 99 | } |
| 100 | hints.ai_family = AF_UNSPEC; |
| 101 | hints.ai_socktype = SOCK_STREAM; |
| 102 | snprintf(portstr, sizeof(portstr), "%d", port); |
| 103 | if (s->listen) |
| 104 | hints.ai_flags |= AI_PASSIVE; |
| 105 | if (!hostname[0]) |
| 106 | ret = getaddrinfo(NULL, portstr, &hints, &ai); |
| 107 | else |
| 108 | ret = getaddrinfo(hostname, portstr, &hints, &ai); |
| 109 | if (ret) { |
| 110 | av_log(h, AV_LOG_ERROR, |
| 111 | "Failed to resolve hostname %s: %s\n", |
| 112 | hostname, gai_strerror(ret)); |
| 113 | return AVERROR(EIO); |
| 114 | } |
| 115 | |
| 116 | cur_ai = ai; |
| 117 | |
| 118 | restart: |
| 119 | fd = ff_socket(cur_ai->ai_family, |
| 120 | cur_ai->ai_socktype, |
| 121 | cur_ai->ai_protocol); |
| 122 | if (fd < 0) { |
| 123 | ret = ff_neterrno(); |
| 124 | goto fail; |
| 125 | } |
| 126 | |
| 127 | if (s->listen) { |
| 128 | if ((fd = ff_listen_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen, |
| 129 | s->listen_timeout, h)) < 0) { |
| 130 | ret = fd; |
| 131 | goto fail1; |
| 132 | } |
| 133 | } else { |
| 134 | if ((ret = ff_listen_connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen, |
| 135 | s->open_timeout / 1000, h, !!cur_ai->ai_next)) < 0) { |
| 136 | |
| 137 | if (ret == AVERROR_EXIT) |
| 138 | goto fail1; |
| 139 | else |
| 140 | goto fail; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | h->is_streamed = 1; |
| 145 | s->fd = fd; |
| 146 | freeaddrinfo(ai); |
| 147 | return 0; |
| 148 | |
| 149 | fail: |
| 150 | if (cur_ai->ai_next) { |
| 151 | /* Retry with the next sockaddr */ |
| 152 | cur_ai = cur_ai->ai_next; |
| 153 | if (fd >= 0) |
| 154 | closesocket(fd); |
| 155 | ret = 0; |
| 156 | goto restart; |
| 157 | } |
| 158 | fail1: |
| 159 | if (fd >= 0) |
| 160 | closesocket(fd); |
| 161 | freeaddrinfo(ai); |
| 162 | return ret; |
| 163 | } |
| 164 | |
| 165 | static int tcp_read(URLContext *h, uint8_t *buf, int size) |
| 166 | { |
| 167 | TCPContext *s = h->priv_data; |
| 168 | int ret; |
| 169 | |
| 170 | if (!(h->flags & AVIO_FLAG_NONBLOCK)) { |
| 171 | ret = ff_network_wait_fd_timeout(s->fd, 0, h->rw_timeout, &h->interrupt_callback); |
| 172 | if (ret) |
| 173 | return ret; |
| 174 | } |
| 175 | ret = recv(s->fd, buf, size, 0); |
| 176 | return ret < 0 ? ff_neterrno() : ret; |
| 177 | } |
| 178 | |
| 179 | static int tcp_write(URLContext *h, const uint8_t *buf, int size) |
| 180 | { |
| 181 | TCPContext *s = h->priv_data; |
| 182 | int ret; |
| 183 | |
| 184 | if (!(h->flags & AVIO_FLAG_NONBLOCK)) { |
| 185 | ret = ff_network_wait_fd_timeout(s->fd, 1, h->rw_timeout, &h->interrupt_callback); |
| 186 | if (ret) |
| 187 | return ret; |
| 188 | } |
| 189 | ret = send(s->fd, buf, size, MSG_NOSIGNAL); |
| 190 | return ret < 0 ? ff_neterrno() : ret; |
| 191 | } |
| 192 | |
| 193 | static int tcp_shutdown(URLContext *h, int flags) |
| 194 | { |
| 195 | TCPContext *s = h->priv_data; |
| 196 | int how; |
| 197 | |
| 198 | if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) { |
| 199 | how = SHUT_RDWR; |
| 200 | } else if (flags & AVIO_FLAG_WRITE) { |
| 201 | how = SHUT_WR; |
| 202 | } else { |
| 203 | how = SHUT_RD; |
| 204 | } |
| 205 | |
| 206 | return shutdown(s->fd, how); |
| 207 | } |
| 208 | |
| 209 | static int tcp_close(URLContext *h) |
| 210 | { |
| 211 | TCPContext *s = h->priv_data; |
| 212 | closesocket(s->fd); |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | static int tcp_get_file_handle(URLContext *h) |
| 217 | { |
| 218 | TCPContext *s = h->priv_data; |
| 219 | return s->fd; |
| 220 | } |
| 221 | |
| 222 | URLProtocol ff_tcp_protocol = { |
| 223 | .name = "tcp", |
| 224 | .url_open = tcp_open, |
| 225 | .url_read = tcp_read, |
| 226 | .url_write = tcp_write, |
| 227 | .url_close = tcp_close, |
| 228 | .url_get_file_handle = tcp_get_file_handle, |
| 229 | .url_shutdown = tcp_shutdown, |
| 230 | .priv_data_size = sizeof(TCPContext), |
| 231 | .priv_data_class = &tcp_context_class, |
| 232 | .flags = URL_PROTOCOL_FLAG_NETWORK, |
| 233 | }; |