| /* | |
| * TCP protocol | |
| * Copyright (c) 2002 Fabrice Bellard | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| #include "avformat.h" | |
| #include "libavutil/avassert.h" | |
| #include "libavutil/parseutils.h" | |
| #include "libavutil/opt.h" | |
| #include "libavutil/time.h" | |
| #include "internal.h" | |
| #include "network.h" | |
| #include "os_support.h" | |
| #include "url.h" | |
| #if HAVE_POLL_H | |
| #include <poll.h> | |
| #endif | |
| typedef struct TCPContext { | |
| const AVClass *class; | |
| int fd; | |
| int listen; | |
| char *local_port; | |
| char *local_addr; | |
| int open_timeout; | |
| int rw_timeout; | |
| int listen_timeout; | |
| int recv_buffer_size; | |
| int send_buffer_size; | |
| int tcp_nodelay; | |
| #if !HAVE_WINSOCK2_H | |
| int tcp_mss; | |
| #endif /* !HAVE_WINSOCK2_H */ | |
| } TCPContext; | |
| #define OFFSET(x) offsetof(TCPContext, x) | |
| #define D AV_OPT_FLAG_DECODING_PARAM | |
| #define E AV_OPT_FLAG_ENCODING_PARAM | |
| static const AVOption options[] = { | |
| { "listen", "Listen for incoming connections", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, .flags = D|E }, | |
| { "local_port", "Local port", OFFSET(local_port), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, .flags = D|E }, | |
| { "local_addr", "Local address", OFFSET(local_addr), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, .flags = D|E }, | |
| { "timeout", "set timeout (in microseconds) of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, | |
| { "listen_timeout", "Connection awaiting timeout (in milliseconds)", OFFSET(listen_timeout), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, | |
| { "send_buffer_size", "Socket send buffer size (in bytes)", OFFSET(send_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, | |
| { "recv_buffer_size", "Socket receive buffer size (in bytes)", OFFSET(recv_buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, | |
| { "tcp_nodelay", "Use TCP_NODELAY to disable nagle's algorithm", OFFSET(tcp_nodelay), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, .flags = D|E }, | |
| #if !HAVE_WINSOCK2_H | |
| { "tcp_mss", "Maximum segment size for outgoing TCP packets", OFFSET(tcp_mss), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E }, | |
| #endif /* !HAVE_WINSOCK2_H */ | |
| { NULL } | |
| }; | |
| static const AVClass tcp_class = { | |
| .class_name = "tcp", | |
| .item_name = av_default_item_name, | |
| .option = options, | |
| .version = LIBAVUTIL_VERSION_INT, | |
| }; | |
| static int customize_fd(void *ctx, int fd, int family) | |
| { | |
| TCPContext *s = ctx; | |
| if (s->local_addr || s->local_port) { | |
| struct addrinfo hints = { 0 }, *ai, *cur_ai; | |
| int ret; | |
| hints.ai_family = family; | |
| hints.ai_socktype = SOCK_STREAM; | |
| ret = getaddrinfo(s->local_addr, s->local_port, &hints, &ai); | |
| if (ret) { | |
| av_log(ctx, AV_LOG_ERROR, | |
| "Failed to getaddrinfo local addr: %s port: %s err: %s\n", | |
| s->local_addr, s->local_port, gai_strerror(ret)); | |
| return ret; | |
| } | |
| cur_ai = ai; | |
| while (cur_ai) { | |
| ret = bind(fd, (struct sockaddr *)cur_ai->ai_addr, (int)cur_ai->ai_addrlen); | |
| if (ret) | |
| cur_ai = cur_ai->ai_next; | |
| else | |
| break; | |
| } | |
| freeaddrinfo(ai); | |
| if (ret) { | |
| ff_log_net_error(ctx, AV_LOG_ERROR, "bind local failed"); | |
| return ret; | |
| } | |
| } | |
| /* Set the socket's send or receive buffer sizes, if specified. | |
| If unspecified or setting fails, system default is used. */ | |
| if (s->recv_buffer_size > 0) { | |
| if (setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &s->recv_buffer_size, sizeof (s->recv_buffer_size))) { | |
| ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(SO_RCVBUF)"); | |
| } | |
| } | |
| if (s->send_buffer_size > 0) { | |
| if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &s->send_buffer_size, sizeof (s->send_buffer_size))) { | |
| ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(SO_SNDBUF)"); | |
| } | |
| } | |
| if (s->tcp_nodelay > 0) { | |
| if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &s->tcp_nodelay, sizeof (s->tcp_nodelay))) { | |
| ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(TCP_NODELAY)"); | |
| } | |
| } | |
| #if !HAVE_WINSOCK2_H | |
| if (s->tcp_mss > 0) { | |
| if (setsockopt (fd, IPPROTO_TCP, TCP_MAXSEG, &s->tcp_mss, sizeof (s->tcp_mss))) { | |
| ff_log_net_error(ctx, AV_LOG_WARNING, "setsockopt(TCP_MAXSEG)"); | |
| } | |
| } | |
| #endif /* !HAVE_WINSOCK2_H */ | |
| return 0; | |
| } | |
| /* return non zero if error */ | |
| static int tcp_open(URLContext *h, const char *uri, int flags) | |
| { | |
| struct addrinfo hints = { 0 }, *ai, *cur_ai; | |
| int port, fd = -1; | |
| TCPContext *s = h->priv_data; | |
| const char *p; | |
| char buf[256]; | |
| int ret; | |
| char hostname[1024],proto[1024],path[1024]; | |
| char portstr[10]; | |
| s->open_timeout = 5000000; | |
| av_url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), | |
| &port, path, sizeof(path), uri); | |
| if (strcmp(proto, "tcp")) | |
| return AVERROR(EINVAL); | |
| if (port <= 0 || port >= 65536) { | |
| av_log(h, AV_LOG_ERROR, "Port missing in uri\n"); | |
| return AVERROR(EINVAL); | |
| } | |
| p = strchr(uri, '?'); | |
| if (p) { | |
| if (av_find_info_tag(buf, sizeof(buf), "listen", p)) { | |
| char *endptr = NULL; | |
| s->listen = strtol(buf, &endptr, 10); | |
| /* assume if no digits were found it is a request to enable it */ | |
| if (buf == endptr) | |
| s->listen = 1; | |
| } | |
| if (av_find_info_tag(buf, sizeof(buf), "local_port", p)) { | |
| av_freep(&s->local_port); | |
| s->local_port = av_strdup(buf); | |
| if (!s->local_port) | |
| return AVERROR(ENOMEM); | |
| } | |
| if (av_find_info_tag(buf, sizeof(buf), "local_addr", p)) { | |
| av_freep(&s->local_addr); | |
| s->local_addr = av_strdup(buf); | |
| if (!s->local_addr) | |
| return AVERROR(ENOMEM); | |
| } | |
| if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) { | |
| s->rw_timeout = strtol(buf, NULL, 10); | |
| } | |
| if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) { | |
| s->listen_timeout = strtol(buf, NULL, 10); | |
| } | |
| if (av_find_info_tag(buf, sizeof(buf), "tcp_nodelay", p)) { | |
| s->tcp_nodelay = strtol(buf, NULL, 10); | |
| } | |
| } | |
| if (s->rw_timeout >= 0) { | |
| s->open_timeout = | |
| h->rw_timeout = s->rw_timeout; | |
| } | |
| hints.ai_family = AF_UNSPEC; | |
| hints.ai_socktype = SOCK_STREAM; | |
| snprintf(portstr, sizeof(portstr), "%d", port); | |
| if (s->listen) | |
| hints.ai_flags |= AI_PASSIVE; | |
| if (!hostname[0]) | |
| ret = getaddrinfo(NULL, portstr, &hints, &ai); | |
| else | |
| ret = getaddrinfo(hostname, portstr, &hints, &ai); | |
| if (ret) { | |
| av_log(h, AV_LOG_ERROR, | |
| "Failed to resolve hostname %s: %s\n", | |
| hostname, gai_strerror(ret)); | |
| return AVERROR(EIO); | |
| } | |
| cur_ai = ai; | |
| #if HAVE_STRUCT_SOCKADDR_IN6 | |
| // workaround for IOS9 getaddrinfo in IPv6 only network use hardcode IPv4 address can not resolve port number. | |
| if (cur_ai->ai_family == AF_INET6){ | |
| struct sockaddr_in6 * sockaddr_v6 = (struct sockaddr_in6 *)cur_ai->ai_addr; | |
| if (!sockaddr_v6->sin6_port){ | |
| sockaddr_v6->sin6_port = htons(port); | |
| } | |
| } | |
| #endif | |
| if (s->listen > 0) { | |
| while (cur_ai && fd < 0) { | |
| fd = ff_socket(cur_ai->ai_family, | |
| cur_ai->ai_socktype, | |
| cur_ai->ai_protocol, h); | |
| if (fd < 0) { | |
| ret = ff_neterrno(); | |
| cur_ai = cur_ai->ai_next; | |
| } | |
| } | |
| if (fd < 0) | |
| goto fail1; | |
| customize_fd(s, fd, cur_ai->ai_family); | |
| } | |
| if (s->listen == 2) { | |
| // multi-client | |
| if ((ret = ff_listen(fd, cur_ai->ai_addr, cur_ai->ai_addrlen, h)) < 0) | |
| goto fail1; | |
| } else if (s->listen == 1) { | |
| // single client | |
| if ((ret = ff_listen_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen, | |
| s->listen_timeout, h)) < 0) | |
| goto fail1; | |
| // Socket descriptor already closed here. Safe to overwrite to client one. | |
| fd = ret; | |
| } else { | |
| ret = ff_connect_parallel(ai, s->open_timeout / 1000, 3, h, &fd, customize_fd, s); | |
| if (ret < 0) | |
| goto fail1; | |
| } | |
| h->is_streamed = 1; | |
| s->fd = fd; | |
| freeaddrinfo(ai); | |
| return 0; | |
| fail1: | |
| if (fd >= 0) | |
| closesocket(fd); | |
| freeaddrinfo(ai); | |
| return ret; | |
| } | |
| static int tcp_accept(URLContext *s, URLContext **c) | |
| { | |
| TCPContext *sc = s->priv_data; | |
| TCPContext *cc; | |
| int ret; | |
| av_assert0(sc->listen); | |
| if ((ret = ffurl_alloc(c, s->filename, s->flags, &s->interrupt_callback)) < 0) | |
| return ret; | |
| cc = (*c)->priv_data; | |
| ret = ff_accept(sc->fd, sc->listen_timeout, s); | |
| if (ret < 0) { | |
| ffurl_closep(c); | |
| return ret; | |
| } | |
| cc->fd = ret; | |
| return 0; | |
| } | |
| static int tcp_read(URLContext *h, uint8_t *buf, int size) | |
| { | |
| TCPContext *s = h->priv_data; | |
| int ret; | |
| if (!(h->flags & AVIO_FLAG_NONBLOCK)) { | |
| ret = ff_network_wait_fd_timeout(s->fd, 0, h->rw_timeout, &h->interrupt_callback); | |
| if (ret) | |
| return ret; | |
| } | |
| ret = recv(s->fd, buf, size, 0); | |
| if (ret == 0) | |
| return AVERROR_EOF; | |
| return ret < 0 ? ff_neterrno() : ret; | |
| } | |
| static int tcp_write(URLContext *h, const uint8_t *buf, int size) | |
| { | |
| TCPContext *s = h->priv_data; | |
| int ret; | |
| if (!(h->flags & AVIO_FLAG_NONBLOCK)) { | |
| ret = ff_network_wait_fd_timeout(s->fd, 1, h->rw_timeout, &h->interrupt_callback); | |
| if (ret) | |
| return ret; | |
| } | |
| ret = send(s->fd, buf, size, MSG_NOSIGNAL); | |
| return ret < 0 ? ff_neterrno() : ret; | |
| } | |
| static int tcp_shutdown(URLContext *h, int flags) | |
| { | |
| TCPContext *s = h->priv_data; | |
| int how; | |
| if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) { | |
| how = SHUT_RDWR; | |
| } else if (flags & AVIO_FLAG_WRITE) { | |
| how = SHUT_WR; | |
| } else { | |
| how = SHUT_RD; | |
| } | |
| return shutdown(s->fd, how); | |
| } | |
| static int tcp_close(URLContext *h) | |
| { | |
| TCPContext *s = h->priv_data; | |
| closesocket(s->fd); | |
| return 0; | |
| } | |
| static int tcp_get_file_handle(URLContext *h) | |
| { | |
| TCPContext *s = h->priv_data; | |
| return s->fd; | |
| } | |
| static int tcp_get_window_size(URLContext *h) | |
| { | |
| TCPContext *s = h->priv_data; | |
| int avail; | |
| socklen_t avail_len = sizeof(avail); | |
| #if HAVE_WINSOCK2_H | |
| /* SO_RCVBUF with winsock only reports the actual TCP window size when | |
| auto-tuning has been disabled via setting SO_RCVBUF */ | |
| if (s->recv_buffer_size < 0) { | |
| return AVERROR(ENOSYS); | |
| } | |
| #endif | |
| if (getsockopt(s->fd, SOL_SOCKET, SO_RCVBUF, &avail, &avail_len)) { | |
| return ff_neterrno(); | |
| } | |
| return avail; | |
| } | |
| const URLProtocol ff_tcp_protocol = { | |
| .name = "tcp", | |
| .url_open = tcp_open, | |
| .url_accept = tcp_accept, | |
| .url_read = tcp_read, | |
| .url_write = tcp_write, | |
| .url_close = tcp_close, | |
| .url_get_file_handle = tcp_get_file_handle, | |
| .url_get_short_seek = tcp_get_window_size, | |
| .url_shutdown = tcp_shutdown, | |
| .priv_data_size = sizeof(TCPContext), | |
| .flags = URL_PROTOCOL_FLAG_NETWORK, | |
| .priv_data_class = &tcp_class, | |
| }; |