/* * TCP protocol * Copyright (c) 2002 Fabrice Bellard * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 "internal.h" #include "network.h" #include "os_support.h" #include "url.h" #if HAVE_POLL_H #include <poll.h> #endif typedef struct TCPContext { int fd; } TCPContext; /* 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; int listen_socket = 0; const char *p; char buf[256]; int ret; int timeout = 100, listen_timeout = -1; char hostname[1024],proto[1024],path[1024]; char portstr[10]; 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)) listen_socket = 1; if (av_find_info_tag(buf, sizeof(buf), "timeout", p)) { timeout = strtol(buf, NULL, 10); } if (av_find_info_tag(buf, sizeof(buf), "listen_timeout", p)) { listen_timeout = strtol(buf, NULL, 10); } } hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; snprintf(portstr, sizeof(portstr), "%d", port); if (listen_socket) 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: fd = ff_socket(cur_ai->ai_family, cur_ai->ai_socktype, cur_ai->ai_protocol); if (fd < 0) { ret = ff_neterrno(); goto fail; } if (listen_socket) { if ((fd = ff_listen_bind(fd, cur_ai->ai_addr, cur_ai->ai_addrlen, listen_timeout, h)) < 0) { ret = fd; goto fail1; } } else { if ((ret = ff_listen_connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen, timeout * 100, h, !!cur_ai->ai_next)) < 0) { if (ret == AVERROR_EXIT) goto fail1; else 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); ret = 0; 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(s->fd, 0); if (ret < 0) 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(s->fd, 1); if (ret < 0) 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; } 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), .flags = URL_PROTOCOL_FLAG_NETWORK, };