stream/tcp.c

   1 /*
   2  * Network layer for MPlayer
   3  *
   4  * Copyright (C) 2001 Bertrand BAUDET <bertrand_baudet@yahoo.com>
   5  *
   6  * This file is part of MPlayer.
   7  *
   8  * MPlayer is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * MPlayer is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26
  27 #include <errno.h>
  28 #include <ctype.h>
  29
  30 #include <fcntl.h>
  31 #include <sys/time.h>
  32 #include <sys/types.h>
  33
  34 #include "config.h"
  35
  36 #include "mp_msg.h"
  37 #include "help_mp.h"
  38
  39 #if !HAVE_WINSOCK2_H
  40 #include <netdb.h>
  41 #include <netinet/in.h>
  42 #include <sys/socket.h>
  43 #include <arpa/inet.h>
  44 #else
  45 #include <winsock2.h>
  46 #include <ws2tcpip.h>
  47 #endif
  48
  49 #include "network.h"
  50 #include "stream.h"
  51 #include "tcp.h"
  52 #include "libavutil/avstring.h"
  53
  54 /* IPv6 options */
  55 int   network_prefer_ipv4 = 0;
  56
  57 // Converts an address family constant to a string
  58
  59 static const char *af2String(int af) {
  60         switch (af) {
  61                 case AF_INET:   return "AF_INET";
  62
  63 #ifdef HAVE_AF_INET6
  64                 case AF_INET6:  return "AF_INET6";
  65 #endif
  66                 default:        return "Unknown address family!";
  67         }
  68 }
  69
  70
  71
  72 // Connect to a server using a TCP connection, with specified address family
  73 // return -2 for fatal error, like unable to resolve name, connection timeout...
  74 // return -1 is unable to connect to a particular port
  75
  76 static int
  77 connect2Server_with_af(char *host, int port, int af,int verb) {
  78         int socket_server_fd;
  79         int err;
  80         socklen_t err_len;
  81         int ret,count = 0;
  82         fd_set set;
  83         struct timeval tv;
  84         union {
  85                 struct sockaddr_in four;
  86 #ifdef HAVE_AF_INET6
  87                 struct sockaddr_in6 six;
  88 #endif
  89         } server_address;
  90         size_t server_address_size;
  91         void *our_s_addr;       // Pointer to sin_addr or sin6_addr
  92         struct hostent *hp=NULL;
  93         char buf[255];
  94
  95 #if HAVE_WINSOCK2_H
  96         unsigned long val;
  97         int to;
  98 #else
  99         struct timeval to;
 100 #endif
 101
 102 #if HAVE_WINSOCK2_H && defined(HAVE_AF_INET6)
 103         // our winsock name resolution code can not handle IPv6
 104         if (af == AF_INET6) {
 105                 mp_msg(MSGT_NETWORK, MSGL_WARN, "IPv6 not supported for winsock2\n");
 106                 return TCP_ERROR_FATAL;
 107         }
 108 #endif
 109
 110         socket_server_fd = socket(af, SOCK_STREAM, 0);
 111
 112
 113         if( socket_server_fd==-1 ) {
 114 //              mp_msg(MSGT_NETWORK,MSGL_ERR,"Failed to create %s socket:\n", af2String(af));
 115                 return TCP_ERROR_FATAL;
 116         }
 117
 118 #if defined(SO_RCVTIMEO) && defined(SO_SNDTIMEO)
 119 #if HAVE_WINSOCK2_H
 120         /* timeout in milliseconds */
 121         to = 10 * 1000;
 122 #else
 123         to.tv_sec = 10;
 124         to.tv_usec = 0;
 125 #endif
 126         setsockopt(socket_server_fd, SOL_SOCKET, SO_RCVTIMEO, &to, sizeof(to));
 127         setsockopt(socket_server_fd, SOL_SOCKET, SO_SNDTIMEO, &to, sizeof(to));
 128 #endif
 129
 130         switch (af) {
 131                 case AF_INET:  our_s_addr = (void *) &server_address.four.sin_addr; break;
 132 #ifdef HAVE_AF_INET6
 133                 case AF_INET6: our_s_addr = (void *) &server_address.six.sin6_addr; break;
 134 #endif
 135                 default:
 136                         mp_msg(MSGT_NETWORK,MSGL_ERR, MSGTR_MPDEMUX_NW_UnknownAF, af);
 137                         return TCP_ERROR_FATAL;
 138         }
 139
 140
 141         memset(&server_address, 0, sizeof(server_address));
 142
 143 #if HAVE_INET_PTON
 144         if (inet_pton(af, host, our_s_addr)!=1)
 145 #elif HAVE_INET_ATON
 146         if (inet_aton(host, our_s_addr)!=1)
 147 #elif HAVE_WINSOCK2_H
 148         if ( inet_addr(host)==INADDR_NONE )
 149 #endif
 150         {
 151                 if(verb) mp_msg(MSGT_NETWORK,MSGL_STATUS,MSGTR_MPDEMUX_NW_ResolvingHostForAF, host, af2String(af));
 152
 153 #ifdef HAVE_GETHOSTBYNAME2
 154                 hp=(struct hostent*)gethostbyname2( host, af );
 155 #else
 156                 hp=(struct hostent*)gethostbyname( host );
 157 #endif
 158                 if( hp==NULL ) {
 159                         if(verb) mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_NW_CantResolv, af2String(af), host);
 160                         return TCP_ERROR_FATAL;
 161                 }
 162
 163                 memcpy( our_s_addr, (void*)hp->h_addr_list[0], hp->h_length );
 164         }
 165 #if HAVE_WINSOCK2_H
 166         else {
 167                 unsigned long addr = inet_addr(host);
 168                 memcpy( our_s_addr, (void*)&addr, sizeof(addr) );
 169         }
 170 #endif
 171
 172         switch (af) {
 173                 case AF_INET:
 174                         server_address.four.sin_family=af;
 175                         server_address.four.sin_port=htons(port);
 176                         server_address_size = sizeof(server_address.four);
 177                         break;
 178 #ifdef HAVE_AF_INET6
 179                 case AF_INET6:
 180                         server_address.six.sin6_family=af;
 181                         server_address.six.sin6_port=htons(port);
 182                         server_address_size = sizeof(server_address.six);
 183                         break;
 184 #endif
 185                 default:
 186                         mp_msg(MSGT_NETWORK,MSGL_ERR, MSGTR_MPDEMUX_NW_UnknownAF, af);
 187                         return TCP_ERROR_FATAL;
 188         }
 189
 190 #if HAVE_INET_ATON || defined(HAVE_WINSOCK2_H)
 191         av_strlcpy( buf, inet_ntoa( *((struct in_addr*)our_s_addr) ), 255);
 192 #else
 193         inet_ntop(af, our_s_addr, buf, 255);
 194 #endif
 195         if(verb) mp_msg(MSGT_NETWORK,MSGL_STATUS,MSGTR_MPDEMUX_NW_ConnectingToServer, host, buf , port );
 196
 197         // Turn the socket as non blocking so we can timeout on the connection
 198 #if !HAVE_WINSOCK2_H
 199         fcntl( socket_server_fd, F_SETFL, fcntl(socket_server_fd, F_GETFL) | O_NONBLOCK );
 200 #else
 201         val = 1;
 202         ioctlsocket( socket_server_fd, FIONBIO, &val );
 203 #endif
 204         if( connect( socket_server_fd, (struct sockaddr*)&server_address, server_address_size )==-1 ) {
 205 #if !HAVE_WINSOCK2_H
 206                 if( errno!=EINPROGRESS ) {
 207 #else
 208                 if( (WSAGetLastError() != WSAEINPROGRESS) && (WSAGetLastError() != WSAEWOULDBLOCK) ) {
 209 #endif
 210                         if(verb) mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_NW_CantConnect2Server, af2String(af));
 211                         closesocket(socket_server_fd);
 212                         return TCP_ERROR_PORT;
 213                 }
 214         }
 215         tv.tv_sec = 0;
 216         tv.tv_usec = 500000;
 217         FD_ZERO( &set );
 218         FD_SET( socket_server_fd, &set );
 219         // When the connection will be made, we will have a writeable fd
 220         while((ret = select(socket_server_fd+1, NULL, &set, NULL, &tv)) == 0) {
 221               if(count > 30 || stream_check_interrupt(500)) {
 222                 if(count > 30)
 223                   mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_NW_ConnTimeout);
 224                 else
 225                   mp_msg(MSGT_NETWORK,MSGL_V,"Connection interrupted by user\n");
 226                 return TCP_ERROR_TIMEOUT;
 227               }
 228               count++;
 229               FD_ZERO( &set );
 230               FD_SET( socket_server_fd, &set );
 231               tv.tv_sec = 0;
 232               tv.tv_usec = 500000;
 233         }
 234         if (ret < 0) mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_NW_SelectFailed);
 235
 236         // Turn back the socket as blocking
 237 #if !HAVE_WINSOCK2_H
 238         fcntl( socket_server_fd, F_SETFL, fcntl(socket_server_fd, F_GETFL) & ~O_NONBLOCK );
 239 #else
 240         val = 0;
 241         ioctlsocket( socket_server_fd, FIONBIO, &val );
 242 #endif
 243         // Check if there were any errors
 244         err_len = sizeof(int);
 245         ret =  getsockopt(socket_server_fd,SOL_SOCKET,SO_ERROR,&err,&err_len);
 246         if(ret < 0) {
 247                 mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_NW_GetSockOptFailed,strerror(errno));
 248                 return TCP_ERROR_FATAL;
 249         }
 250         if(err > 0) {
 251                 mp_msg(MSGT_NETWORK,MSGL_ERR,MSGTR_MPDEMUX_NW_ConnectError,strerror(err));
 252                 return TCP_ERROR_PORT;
 253         }
 254
 255         return socket_server_fd;
 256 }
 257
 258 // Connect to a server using a TCP connection
 259 // return -2 for fatal error, like unable to resolve name, connection timeout...
 260 // return -1 is unable to connect to a particular port
 261
 262
 263 int
 264 connect2Server(char *host, int  port, int verb) {
 265 #ifdef HAVE_AF_INET6
 266         int r;
 267         int s = TCP_ERROR_FATAL;
 268
 269         r = connect2Server_with_af(host, port, network_prefer_ipv4 ? AF_INET:AF_INET6,verb);
 270         if (r >= 0) return r;
 271
 272         s = connect2Server_with_af(host, port, network_prefer_ipv4 ? AF_INET6:AF_INET,verb);
 273         if (s == TCP_ERROR_FATAL) return r;
 274         return s;
 275 #else
 276         return connect2Server_with_af(host, port, AF_INET,verb);
 277 #endif
 278
 279
 280 }