/* * 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; 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 }, { "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 void customize_fd(void *ctx, int fd) { TCPContext *s = ctx; /* 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 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), "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); if (fd < 0) { ret = ff_neterrno(); cur_ai = cur_ai->ai_next; } } if (fd < 0) goto fail1; customize_fd(s, fd); } if (s->listen == 2) { // multi-client if ((ret = ff_listen(fd, cur_ai->ai_addr, cur_ai->ai_addrlen)) < 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, };