/* * 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 <unistd.h> #include "internal.h" #include "network.h" #include "os_support.h" #if HAVE_POLL_H #include <poll.h> #endif #include <sys/time.h> 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, *ai, *cur_ai; int port, fd = -1; TCPContext *s = NULL; int ret; socklen_t optlen; 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") || port <= 0 || port >= 65536) return AVERROR(EINVAL); memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; snprintf(portstr, sizeof(portstr), "%d", port); ret = getaddrinfo(hostname, portstr, &hints, &ai); if (ret) { av_log(NULL, AV_LOG_ERROR, "Failed to resolve hostname %s: %s\n", hostname, gai_strerror(ret)); return AVERROR(EIO); } cur_ai = ai; restart: fd = socket(cur_ai->ai_family, cur_ai->ai_socktype, cur_ai->ai_protocol); if (fd < 0) goto fail; ff_socket_nonblock(fd, 1); redo: ret = connect(fd, cur_ai->ai_addr, cur_ai->ai_addrlen); if (ret < 0) { struct pollfd p = {fd, POLLOUT, 0}; if (ff_neterrno() == AVERROR(EINTR)) { if (url_interrupt_cb()) goto fail1; goto redo; } if (ff_neterrno() != AVERROR(EINPROGRESS) && ff_neterrno() != AVERROR(EAGAIN)) goto fail; /* wait until we are connected or until abort */ for(;;) { if (url_interrupt_cb()) { ret = AVERROR(EINTR); goto fail1; } ret = poll(&p, 1, 100); if (ret > 0) break; } /* test error */ optlen = sizeof(ret); getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen); if (ret != 0) { av_log(NULL, AV_LOG_ERROR, "TCP connection to %s:%d failed: %s\n", hostname, port, strerror(ret)); goto fail; } } s = av_malloc(sizeof(TCPContext)); if (!s) { freeaddrinfo(ai); return AVERROR(ENOMEM); } h->priv_data = s; 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; } ret = AVERROR(EIO); fail1: if (fd >= 0) closesocket(fd); freeaddrinfo(ai); return ret; } static int tcp_wait_fd(int fd, int write) { int ev = write ? POLLOUT : POLLIN; struct pollfd p = { .fd = fd, .events = ev, .revents = 0 }; int ret; ret = poll(&p, 1, 100); return ret < 0 ? ff_neterrno() : p.revents & ev ? 0 : AVERROR(EAGAIN); } static int tcp_read(URLContext *h, uint8_t *buf, int size) { TCPContext *s = h->priv_data; int ret; if (!(h->flags & URL_FLAG_NONBLOCK)) { ret = tcp_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 & URL_FLAG_NONBLOCK)) { ret = tcp_wait_fd(s->fd, 1); if (ret < 0) return ret; } ret = send(s->fd, buf, size, 0); return ret < 0 ? ff_neterrno() : ret; } static int tcp_close(URLContext *h) { TCPContext *s = h->priv_data; closesocket(s->fd); av_free(s); return 0; } static int tcp_get_file_handle(URLContext *h) { TCPContext *s = h->priv_data; return s->fd; } URLProtocol ff_tcp_protocol = { "tcp", tcp_open, tcp_read, tcp_write, NULL, /* seek */ tcp_close, .url_get_file_handle = tcp_get_file_handle, };