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
52 # define EAFNOSUPPORT WSAEAFNOSUPPORT
56 # define SOL_IP IPPROTO_IP
59 # define SOL_IPV6 IPPROTO_IPV6
62 # define IPPROTO_IPV6 41
65 extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
69 static int net_SetMcastHopLimit( vlc_object_t *p_this,
70 int fd, int family, int hlim )
75 /* There is some confusion in the world whether IP_MULTICAST_TTL
76 * takes a byte or an int as an argument.
77 * BSD seems to indicate byte so we are going with that and use
78 * int as a fallback to be safe */
83 cmd = IP_MULTICAST_TTL;
86 #ifdef IPV6_MULTICAST_HOPS
89 cmd = IPV6_MULTICAST_HOPS;
94 msg_Warn( p_this, "%s", strerror( EAFNOSUPPORT ) );
98 if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
100 /* BSD compatibility */
103 buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
104 if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) )
112 static int net_SetMcastSource( vlc_object_t *p_this,
113 int fd, int family, const char *str )
122 if( inet_pton( AF_INET, str, &addr) <= 0 )
124 msg_Err( p_this, "Invalid multicast interface %s",
129 if( setsockopt( fd, IPPROTO_IP, IP_MULTICAST_IF, &addr,
130 sizeof( addr ) ) < 0 )
132 msg_Dbg( p_this, "Cannot set multicast interface (%s)",
139 #ifdef IPV6_MULTICAST_IF
143 msg_Warn( p_this, "%s", strerror( EAFNOSUPPORT ) );
151 /*****************************************************************************
153 *****************************************************************************
154 * Open a UDP socket to send data to a defined destination, with an optional
156 *****************************************************************************/
157 int __net_ConnectUDP( vlc_object_t *p_this, const char *psz_host, int i_port,
160 struct addrinfo hints, *res, *ptr;
161 int i_val, i_handle = -1;
162 vlc_bool_t b_unreach = VLC_FALSE;
165 i_port = 1234; /* historical VLC thing */
168 i_hlim = var_CreateGetInteger( p_this, "ttl" );
170 memset( &hints, 0, sizeof( hints ) );
171 hints.ai_socktype = SOCK_DGRAM;
173 msg_Dbg( p_this, "net: connecting to %s port %d", psz_host, i_port );
175 i_val = vlc_getaddrinfo( p_this, psz_host, i_port, &hints, &res );
178 msg_Err( p_this, "cannot resolve %s port %d : %s", psz_host, i_port,
179 vlc_gai_strerror( i_val ) );
183 for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
188 fd = net_Socket( p_this, ptr->ai_family, ptr->ai_socktype,
192 #if !defined( SYS_BEOS )
197 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
198 * to avoid packet loss caused by scheduling problems */
200 setsockopt( fd, SOL_SOCKET, SO_RCVBUF, (void *)&i_val,
203 setsockopt( fd, SOL_SOCKET, SO_SNDBUF, (void *)&i_val,
206 /* Allow broadcast sending */
208 setsockopt( i_handle, SOL_SOCKET, SO_BROADCAST, (void*)&i_val,
214 net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
215 psz_mif_addr = config_GetPsz( p_this, "miface-addr" );
216 if( psz_mif_addr != NULL )
218 net_SetMcastSource( p_this, fd, ptr->ai_family, psz_mif_addr );
219 free( psz_mif_addr );
222 if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
229 #if defined( WIN32 ) || defined( UNDER_CE )
230 if( WSAGetLastError () == WSAENETUNREACH )
232 if( errno == ENETUNREACH )
234 b_unreach = VLC_TRUE;
237 msg_Warn( p_this, "%s port %d : %s", psz_host, i_port,
244 vlc_freeaddrinfo( res );
249 msg_Err( p_this, "Host %s port %d is unreachable", psz_host,
257 /*****************************************************************************
259 *****************************************************************************
260 * Open a UDP connection and return a handle
261 *****************************************************************************/
262 int __net_OpenUDP( vlc_object_t *p_this, const char *psz_bind, int i_bind,
263 const char *psz_server, int i_server )
267 network_socket_t sock;
268 module_t *p_network = NULL;
270 if( ( psz_server != NULL ) && ( psz_server[0] == '\0' ) )
271 msg_Warn( p_this, "calling net_OpenUDP with an explicit destination "
272 "is obsolete - use net_ConnectUDP instead" );
274 msg_Warn( p_this, "calling net_OpenUDP with an explicit destination "
275 "port is obsolete - use __net_ConnectUDP instead" );
277 if( psz_server == NULL ) psz_server = "";
278 if( psz_bind == NULL ) psz_bind = "";
280 /* Prepare the network_socket_t structure */
281 sock.psz_bind_addr = psz_bind;
282 sock.i_bind_port = i_bind;
283 sock.psz_server_addr = psz_server;
284 sock.i_server_port = i_server;
289 msg_Dbg( p_this, "net: connecting to '[%s]:%d@[%s]:%d'",
290 psz_server, i_server, psz_bind, i_bind );
292 /* Check if we have force ipv4 or ipv6 */
293 var_Create( p_this, "ipv4", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
294 var_Get( p_this, "ipv4", &v4 );
295 var_Create( p_this, "ipv6", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
296 var_Get( p_this, "ipv6", &v6 );
303 /* try IPv6 first (unless IPv4 forced) */
304 private = p_this->p_private;
305 p_this->p_private = (void*)&sock;
306 p_network = module_Need( p_this, "network", "ipv6", VLC_TRUE );
308 if( p_network != NULL )
309 module_Unneed( p_this, p_network );
311 p_this->p_private = private;
314 * Check if the IP stack can receive IPv4 packets on IPv6 sockets.
315 * If yes, then it is better to use the IPv6 socket.
316 * Otherwise, if we also get an IPv4, we have to choose, so we use
319 if( ( sock.i_handle != -1 ) && ( ( sock.v6only == 0 ) || v6.b_bool ) )
320 return sock.i_handle;
325 int fd6 = sock.i_handle;
327 /* also try IPv4 (unless IPv6 forced) */
328 private = p_this->p_private;
329 p_this->p_private = (void*)&sock;
330 p_network = module_Need( p_this, "network", "ipv4", VLC_TRUE );
332 if( p_network != NULL )
333 module_Unneed( p_this, p_network );
335 p_this->p_private = private;
339 if( sock.i_handle != -1 )
341 msg_Warn( p_this, "net: lame IPv6/IPv4 dual-stack present. "
342 "Using only IPv4." );
350 if( sock.i_handle == -1 )
351 msg_Dbg( p_this, "net: connection to '[%s]:%d@[%s]:%d' failed",
352 psz_server, i_server, psz_bind, i_bind );
354 return sock.i_handle;