/* * 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/parseutils.h" #include "libavutil/opt.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 rw_timeout; int listen_timeout; } 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 on port instead of connecting", OFFSET(listen), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E }, {"timeout", "timeout of socket i/o operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E }, {"listen_timeout", "connection awaiting timeout", OFFSET(listen_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E }, {NULL} }; static const AVClass tcp_context_class = { .class_name = "tcp", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; /* 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; socklen_t optlen; char hostname[1024],proto[1024],path[1024]; char portstr[10]; h->rw_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)) 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); } } 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; restart: ret = AVERROR(EIO); fd = socket(cur_ai->ai_family, cur_ai->ai_socktype, cur_ai->ai_protocol); if (fd < 0) goto fail; if (s->listen) { int fd1; int reuse = 1; struct pollfd lp = { fd, POLLIN, 0 }; setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)); ret = bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen); if (ret) { ret = ff_neterrno(); goto fail1; } ret = listen(fd, 1); if (ret) { ret = ff_neterrno(); goto fail1; } ret = poll(&lp, 1, s->listen_timeout >= 0 ? s->listen_timeout : -1); if (ret <= 0) { ret = AVERROR(ETIMEDOUT); goto fail1; } fd1 = accept(fd, NULL, NULL); if (fd1 < 0) { ret = ff_neterrno(); goto fail1; } closesocket(fd); fd = fd1; ff_socket_nonblock(fd, 1); } else { redo: ff_socket_nonblock(fd, 1); ret = connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen); } if (ret < 0) { struct pollfd p = {fd, POLLOUT, 0}; int64_t wait_started; ret = ff_neterrno(); if (ret == AVERROR(EINTR)) { if (ff_check_interrupt(&h->interrupt_callback)) { ret = AVERROR_EXIT; goto fail1; } goto redo; } if (ret != AVERROR(EINPROGRESS) && ret != AVERROR(EAGAIN)) goto fail; /* wait until we are connected or until abort */ wait_started = av_gettime(); do { if (ff_check_interrupt(&h->interrupt_callback)) { ret = AVERROR_EXIT; goto fail1; } ret = poll(&p, 1, 100); if (ret > 0) break; } while (!h->rw_timeout || (av_gettime() - wait_started < h->rw_timeout)); if (ret <= 0) { ret = AVERROR(ETIMEDOUT); goto fail; } /* test error */ optlen = sizeof(ret); if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen)) ret = AVUNERROR(ff_neterrno()); if (ret != 0) { char errbuf[100]; ret = AVERROR(ret); av_strerror(ret, errbuf, sizeof(errbuf)); av_log(h, AV_LOG_ERROR, "TCP connection to %s:%d failed: %s\n", hostname, port, errbuf); goto fail; } } h->is_streamed = 1; s->fd = fd; freeaddrinfo(ai); return 0; fail: if (cur_ai->ai_next) { /* Retry with the next sockaddr */ cur_ai = cur_ai->ai_next; if (fd >= 0) closesocket(fd); goto restart; } fail1: if (fd >= 0) closesocket(fd); freeaddrinfo(ai); return ret; } 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); 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, 0); 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; } URLProtocol ff_tcp_protocol = { .name = "tcp", .url_open = tcp_open, .url_read = tcp_read, .url_write = tcp_write, .url_close = tcp_close, .url_get_file_handle = tcp_get_file_handle, .url_shutdown = tcp_shutdown, .priv_data_size = sizeof(TCPContext), .priv_data_class = &tcp_context_class, .flags = URL_PROTOCOL_FLAG_NETWORK, };