1/* 2 * TCP protocol 3 * Copyright (c) 2002 Fabrice Bellard 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21#include "avformat.h" 22#include <unistd.h> 23#include "network.h" 24#include "os_support.h" 25#if HAVE_SYS_SELECT_H 26#include <sys/select.h> 27#endif 28#include <sys/time.h> 29 30typedef struct TCPContext { 31 int fd; 32} TCPContext; 33 34/* return non zero if error */ 35static int tcp_open(URLContext *h, const char *uri, int flags) 36{ 37 struct sockaddr_in dest_addr; 38 int port, fd = -1; 39 TCPContext *s = NULL; 40 fd_set wfds; 41 int fd_max, ret; 42 struct timeval tv; 43 socklen_t optlen; 44 char hostname[1024],proto[1024],path[1024]; 45 46 if(!ff_network_init()) 47 return AVERROR(EIO); 48 49 url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), 50 &port, path, sizeof(path), uri); 51 if (strcmp(proto,"tcp") || port <= 0 || port >= 65536) 52 return AVERROR(EINVAL); 53 54 dest_addr.sin_family = AF_INET; 55 dest_addr.sin_port = htons(port); 56 if (resolve_host(&dest_addr.sin_addr, hostname) < 0) 57 return AVERROR(EIO); 58 59 fd = socket(AF_INET, SOCK_STREAM, 0); 60 if (fd < 0) 61 return AVERROR(EIO); 62 ff_socket_nonblock(fd, 1); 63 64 redo: 65 ret = connect(fd, (struct sockaddr *)&dest_addr, 66 sizeof(dest_addr)); 67 if (ret < 0) { 68 if (ff_neterrno() == FF_NETERROR(EINTR)) 69 goto redo; 70 if (ff_neterrno() != FF_NETERROR(EINPROGRESS) && 71 ff_neterrno() != FF_NETERROR(EAGAIN)) 72 goto fail; 73 74 /* wait until we are connected or until abort */ 75 for(;;) { 76 if (url_interrupt_cb()) { 77 ret = AVERROR(EINTR); 78 goto fail1; 79 } 80 fd_max = fd; 81 FD_ZERO(&wfds); 82 FD_SET(fd, &wfds); 83 tv.tv_sec = 0; 84 tv.tv_usec = 100 * 1000; 85 ret = select(fd_max + 1, NULL, &wfds, NULL, &tv); 86 if (ret > 0 && FD_ISSET(fd, &wfds)) 87 break; 88 } 89 90 /* test error */ 91 optlen = sizeof(ret); 92 getsockopt (fd, SOL_SOCKET, SO_ERROR, &ret, &optlen); 93 if (ret != 0) 94 goto fail; 95 } 96 s = av_malloc(sizeof(TCPContext)); 97 if (!s) 98 return AVERROR(ENOMEM); 99 h->priv_data = s; 100 h->is_streamed = 1; 101 s->fd = fd; 102 return 0; 103 104 fail: 105 ret = AVERROR(EIO); 106 fail1: 107 if (fd >= 0) 108 closesocket(fd); 109 return ret; 110} 111 112static int tcp_read(URLContext *h, uint8_t *buf, int size) 113{ 114 TCPContext *s = h->priv_data; 115 int len, fd_max, ret; 116 fd_set rfds; 117 struct timeval tv; 118 119 for (;;) { 120 if (url_interrupt_cb()) 121 return AVERROR(EINTR); 122 fd_max = s->fd; 123 FD_ZERO(&rfds); 124 FD_SET(s->fd, &rfds); 125 tv.tv_sec = 0; 126 tv.tv_usec = 100 * 1000; 127 ret = select(fd_max + 1, &rfds, NULL, NULL, &tv); 128 if (ret > 0 && FD_ISSET(s->fd, &rfds)) { 129 len = recv(s->fd, buf, size, 0); 130 if (len < 0) { 131 if (ff_neterrno() != FF_NETERROR(EINTR) && 132 ff_neterrno() != FF_NETERROR(EAGAIN)) 133 return AVERROR(errno); 134 } else return len; 135 } else if (ret < 0) { 136 return -1; 137 } 138 } 139} 140 141static int tcp_write(URLContext *h, uint8_t *buf, int size) 142{ 143 TCPContext *s = h->priv_data; 144 int ret, size1, fd_max, len; 145 fd_set wfds; 146 struct timeval tv; 147 148 size1 = size; 149 while (size > 0) { 150 if (url_interrupt_cb()) 151 return AVERROR(EINTR); 152 fd_max = s->fd; 153 FD_ZERO(&wfds); 154 FD_SET(s->fd, &wfds); 155 tv.tv_sec = 0; 156 tv.tv_usec = 100 * 1000; 157 ret = select(fd_max + 1, NULL, &wfds, NULL, &tv); 158 if (ret > 0 && FD_ISSET(s->fd, &wfds)) { 159 len = send(s->fd, buf, size, 0); 160 if (len < 0) { 161 if (ff_neterrno() != FF_NETERROR(EINTR) && 162 ff_neterrno() != FF_NETERROR(EAGAIN)) 163 return AVERROR(errno); 164 continue; 165 } 166 size -= len; 167 buf += len; 168 } else if (ret < 0) { 169 return -1; 170 } 171 } 172 return size1 - size; 173} 174 175static int tcp_close(URLContext *h) 176{ 177 TCPContext *s = h->priv_data; 178 closesocket(s->fd); 179 ff_network_close(); 180 av_free(s); 181 return 0; 182} 183 184URLProtocol tcp_protocol = { 185 "tcp", 186 tcp_open, 187 tcp_read, 188 tcp_write, 189 NULL, /* seek */ 190 tcp_close, 191}; 192