1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2004-2005 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@videolan.org>
8 * RĂ©mi Denis-Courmont <rem # videolan.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
36 #ifdef HAVE_SYS_TIME_H
37 # include <sys/time.h>
46 # if defined(UNDER_CE)
47 # undef IP_MULTICAST_TTL
48 # define IP_MULTICAST_TTL 3
49 # undef IP_ADD_MEMBERSHIP
50 # define IP_ADD_MEMBERSHIP 5
55 # define SOL_IP IPPROTO_IP
58 # define SOL_IPV6 IPPROTO_IPV6
61 # define IPPROTO_IPV6 41
64 extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
68 static void net_SetMcastHopLimit( int fd, int family, int hlim )
72 /* There is some confusion in the world whether IP_MULTICAST_TTL
73 * takes a byte or an int as an argument.
74 * BSD seems to indicate byte so we are going with that and use
75 * int as a fallback to be safe */
80 cmd = IP_MULTICAST_TTL;
83 #ifdef IPV6_MULTICAST_HOPS
86 cmd = IPV6_MULTICAST_HOPS;
94 if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
96 /* BSD compatibility */
99 buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
100 setsockopt( fd, proto, cmd, &buf, sizeof( buf ) );
105 /*****************************************************************************
107 *****************************************************************************
108 * Open a UDP socket to send data to a defined destination, with an optional
110 *****************************************************************************/
111 int __net_ConnectUDP( vlc_object_t *p_this, const char *psz_host, int i_port,
114 struct addrinfo hints, *res, *ptr;
115 int i_val, i_handle = -1;
116 vlc_bool_t b_unreach = VLC_FALSE;
119 i_port = 1234; /* historical VLC thing */
125 if( var_Get( p_this, "ttl", &val ) != VLC_SUCCESS )
127 var_Create( p_this, "ttl", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
128 var_Get( p_this, "ttl", &val );
132 if( i_hlim < 1 ) i_hlim = 1;
135 memset( &hints, 0, sizeof( hints ) );
136 hints.ai_socktype = SOCK_DGRAM;
138 msg_Dbg( p_this, "net: connecting to %s port %d", psz_host, i_port );
140 i_val = vlc_getaddrinfo( p_this, psz_host, i_port, &hints, &res );
143 msg_Err( p_this, "cannot resolve %s port %d : %s", psz_host, i_port,
144 vlc_gai_strerror( i_val ) );
148 for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
152 fd = net_Socket( p_this, ptr->ai_family, ptr->ai_socktype,
156 #if !defined( SYS_BEOS )
161 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
162 * to avoid packet loss caused by scheduling problems */
164 setsockopt( fd, SOL_SOCKET, SO_RCVBUF, (void *)&i_val,
167 setsockopt( fd, SOL_SOCKET, SO_SNDBUF, (void *)&i_val,
172 net_SetMcastHopLimit( fd, ptr->ai_family, i_hlim );
174 if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
181 #if defined( WIN32 ) || defined( UNDER_CE )
182 if( WSAGetLastError () == WSAENETUNREACH )
184 if( errno == ENETUNREACH )
186 b_unreach = VLC_TRUE;
189 msg_Warn( p_this, "%s port %d : %s", psz_host, i_port,
196 vlc_freeaddrinfo( res );
201 msg_Err( p_this, "Host %s port %d is unreachable", psz_host,
209 /*****************************************************************************
211 *****************************************************************************
212 * Open a UDP connection and return a handle
213 *****************************************************************************/
214 int __net_OpenUDP( vlc_object_t *p_this, const char *psz_bind, int i_bind,
215 const char *psz_server, int i_server )
219 network_socket_t sock;
220 module_t *p_network = NULL;
222 if( ( psz_server != NULL ) && ( psz_server[0] == '\0' ) )
223 msg_Warn( p_this, "calling net_OpenUDP with an explicit destination "
224 "is obsolete - use net_ConnectUDP instead" );
226 msg_Warn( p_this, "calling net_OpenUDP with an explicit destination "
227 "port is obsolete - use __net_ConnectUDP instead" );
229 if( psz_server == NULL ) psz_server = "";
230 if( psz_bind == NULL ) psz_bind = "";
232 /* Prepare the network_socket_t structure */
233 sock.psz_bind_addr = psz_bind;
234 sock.i_bind_port = i_bind;
235 sock.psz_server_addr = psz_server;
236 sock.i_server_port = i_server;
241 msg_Dbg( p_this, "net: connecting to '[%s]:%d@[%s]:%d'",
242 psz_server, i_server, psz_bind, i_bind );
244 /* Check if we have force ipv4 or ipv6 */
245 var_Create( p_this, "ipv4", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
246 var_Get( p_this, "ipv4", &v4 );
247 var_Create( p_this, "ipv6", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
248 var_Get( p_this, "ipv6", &v6 );
255 /* try IPv6 first (unless IPv4 forced) */
256 private = p_this->p_private;
257 p_this->p_private = (void*)&sock;
258 p_network = module_Need( p_this, "network", "ipv6", VLC_TRUE );
260 if( p_network != NULL )
261 module_Unneed( p_this, p_network );
263 p_this->p_private = private;
266 * Check if the IP stack can receive IPv4 packets on IPv6 sockets.
267 * If yes, then it is better to use the IPv6 socket.
268 * Otherwise, if we also get an IPv4, we have to choose, so we use
271 if( ( sock.i_handle != -1 ) && ( ( sock.v6only == 0 ) || v6.b_bool ) )
272 return sock.i_handle;
277 int fd6 = sock.i_handle;
279 /* also try IPv4 (unless IPv6 forced) */
280 private = p_this->p_private;
281 p_this->p_private = (void*)&sock;
282 p_network = module_Need( p_this, "network", "ipv4", VLC_TRUE );
284 if( p_network != NULL )
285 module_Unneed( p_this, p_network );
287 p_this->p_private = private;
291 if( sock.i_handle != -1 )
293 msg_Warn( p_this, "net: lame IPv6/IPv4 dual-stack present. "
294 "Using only IPv4." );
302 if( sock.i_handle == -1 )
303 msg_Dbg( p_this, "net: connection to '[%s]:%d@[%s]:%d' failed",
304 psz_server, i_server, psz_bind, i_bind );
306 return sock.i_handle;