1 /*****************************************************************************
2 * ipv6.c: IPv6 network abstraction layer
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: ipv6.c,v 1.14 2003/07/31 23:44:49 fenrir Exp $
7 * Authors: Alexis Guillard <alexis.guillard@bt.com>
8 * Christophe Massiot <massiot@via.ecp.fr>
9 * Remco Poortinga <poortinga@telin.nl>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
30 #include <sys/types.h>
40 #elif defined( _MSC_VER ) && defined( _WIN32 )
45 # include <winsock2.h>
46 # include <ws2tcpip.h>
47 #elif !defined( SYS_BEOS ) && !defined( SYS_NTO )
48 # include <netdb.h> /* hostent ... */
49 # include <sys/socket.h>
50 # include <netinet/in.h>
52 # ifdef HAVE_ARPA_INET_H
53 # include <arpa/inet.h> /* inet_ntoa(), inet_aton() */
60 static const struct in6_addr in6addr_any = {{IN6ADDR_ANY_INIT}};
61 /* the following will have to be removed when w32api defines them */
63 # define IPPROTO_IPV6 41
65 #ifndef IPV6_JOIN_GROUP
66 # define IPV6_JOIN_GROUP 12
68 #ifndef IPV6_MULTICAST_HOPS
69 # define IPV6_MULTICAST_HOPS 10
71 #ifndef IPV6_UNICAST_HOPS
72 # define IPV6_UNICAST_HOPS 4
74 # define close closesocket
77 /*****************************************************************************
79 *****************************************************************************/
80 static int Open( vlc_object_t * );
82 /*****************************************************************************
84 *****************************************************************************/
86 set_description( _("IPv6 network abstraction layer") );
87 set_capability( "network", 40 );
88 set_callbacks( Open, NULL );
91 /*****************************************************************************
92 * BuildAddr: utility function to build a struct sockaddr_in6
93 *****************************************************************************/
94 static int BuildAddr( vlc_object_t * p_this, struct sockaddr_in6 * p_socket,
95 const char * psz_bind_address, int i_port )
97 char * psz_multicast_interface = "";
98 char * psz_backup = strdup(psz_bind_address);
99 char * psz_address = psz_backup;
102 /* Try to get getaddrinfo() and freeaddrinfo() from wship6.dll */
103 typedef int (CALLBACK * GETADDRINFO) ( const char *nodename,
104 const char *servname,
105 const struct addrinfo *hints,
106 struct addrinfo **res );
107 typedef void (CALLBACK * FREEADDRINFO) ( struct addrinfo FAR *ai );
109 struct addrinfo hints, *res;
110 GETADDRINFO _getaddrinfo = NULL;
111 FREEADDRINFO _freeaddrinfo = NULL;
113 HINSTANCE wship6_dll = LoadLibrary("wship6.dll");
116 _getaddrinfo = (GETADDRINFO) GetProcAddress( wship6_dll,
118 _freeaddrinfo = (FREEADDRINFO) GetProcAddress( wship6_dll,
121 if( !_getaddrinfo || !_freeaddrinfo )
123 msg_Warn( p_this, "no IPv6 stack installed" );
124 if( wship6_dll ) FreeLibrary( wship6_dll );
131 memset( p_socket, 0, sizeof( struct sockaddr_in6 ) );
132 p_socket->sin6_family = AF_INET6; /* family */
133 p_socket->sin6_port = htons( i_port );
136 p_socket->sin6_addr = in6addr_any;
138 else if( psz_address[0] == '['
139 && psz_address[strlen(psz_address) - 1] == ']' )
141 psz_address[strlen(psz_address) - 1] = '\0';
144 /* see if there is an interface name in there... */
145 if( (psz_multicast_interface = strchr(psz_address, '%')) != NULL )
147 *psz_multicast_interface = '\0';
148 psz_multicast_interface++;
149 msg_Dbg( p_this, "Interface name specified: \"%s\"",
150 psz_multicast_interface );
152 /* now convert that interface name to an index */
155 p_socket->sin6_scope_id = atol(psz_multicast_interface);
156 #elif defined( HAVE_IF_NAMETOINDEX )
157 p_socket->sin6_scope_id = if_nametoindex(psz_multicast_interface);
159 msg_Dbg( p_this, " = #%i", p_socket->sin6_scope_id );
162 #if !defined( WIN32 )
163 inet_pton(AF_INET6, psz_address, &p_socket->sin6_addr.s6_addr);
166 memset(&hints, 0, sizeof(hints));
167 hints.ai_family = AF_INET6;
168 hints.ai_flags = AI_NUMERICHOST;
170 if( _getaddrinfo( psz_address, NULL, &hints, &res ) )
172 FreeLibrary( wship6_dll );
176 memcpy( &p_socket->sin6_addr,
177 &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr,
178 sizeof(struct in6_addr) );
179 _freeaddrinfo( res );
185 #ifdef HAVE_GETHOSTBYNAME2
186 struct hostent * p_hostent;
188 /* We have a fqdn, try to find its address */
189 if ( (p_hostent = gethostbyname2( psz_address, AF_INET6 )) == NULL )
191 msg_Warn( p_this, "ipv6 error: unknown host %s", psz_address );
196 /* Copy the first address of the host in the socket address */
197 memcpy( &p_socket->sin6_addr, p_hostent->h_addr_list[0],
198 p_hostent->h_length );
201 if( _getaddrinfo( psz_address, NULL, &hints, &res ) )
203 FreeLibrary( wship6_dll );
207 memcpy( &p_socket->sin6_addr,
208 &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr,
209 sizeof(struct in6_addr) );
210 _freeaddrinfo( res );
213 msg_Warn( p_this, "ipv6 error: IPv6 address %s is invalid",
221 FreeLibrary( wship6_dll );
228 /*****************************************************************************
229 * OpenUDP: open a UDP socket
230 *****************************************************************************
231 * psz_bind_addr, i_bind_port : address and port used for the bind()
232 * system call. If psz_bind_addr == NULL, the socket is bound to
233 * in6addr_any and broadcast reception is enabled. If i_bind_port == 0,
234 * 1234 is used. If psz_bind_addr is a multicast (class D) address,
235 * join the multicast group.
236 * psz_server_addr, i_server_port : address and port used for the connect()
237 * system call. It can avoid receiving packets from unauthorized IPs.
238 * Its use leads to great confusion and is currently discouraged.
239 * This function returns -1 in case of error.
240 *****************************************************************************/
241 static int OpenUDP( vlc_object_t * p_this, network_socket_t * p_socket )
243 char * psz_bind_addr = p_socket->psz_bind_addr;
244 int i_bind_port = p_socket->i_bind_port;
245 char * psz_server_addr = p_socket->psz_server_addr;
246 int i_server_port = p_socket->i_server_port;
249 socklen_t i_opt_size;
250 struct sockaddr_in6 sock;
252 /* Open a SOCK_DGRAM (UDP) socket, in the AF_INET6 domain, automatic (0)
254 if( (i_handle = socket( AF_INET6, SOCK_DGRAM, 0 )) == -1 )
256 msg_Warn( p_this, "cannot create socket (%s)", strerror(errno) );
260 /* We may want to reuse an already used socket */
262 if( setsockopt( i_handle, SOL_SOCKET, SO_REUSEADDR,
263 (void *) &i_opt, sizeof( i_opt ) ) == -1 )
265 msg_Warn( p_this, "cannot configure socket (SO_REUSEADDR: %s)",
271 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s) to avoid
272 * packet loss caused by scheduling problems */
274 if( setsockopt( i_handle, SOL_SOCKET, SO_RCVBUF,
275 (void *) &i_opt, sizeof( i_opt ) ) == -1 )
277 msg_Warn( p_this, "cannot configure socket (SO_RCVBUF: %s)",
281 /* Check if we really got what we have asked for, because Linux, etc.
282 * will silently limit the max buffer size to net.core.rmem_max which
283 * is typically only 65535 bytes */
285 i_opt_size = sizeof( i_opt );
286 if( getsockopt( i_handle, SOL_SOCKET, SO_RCVBUF,
287 (void*) &i_opt, &i_opt_size ) == -1 )
289 msg_Warn( p_this, "cannot query socket (SO_RCVBUF: %s)",
292 else if( i_opt < 0x80000 )
294 msg_Warn( p_this, "socket buffer size is 0x%x instead of 0x%x",
298 /* Build the local socket */
299 if ( BuildAddr( p_this, &sock, psz_bind_addr, i_bind_port ) == -1 )
306 /* Under Win32 and for multicasting, we bind to IN6ADDR_ANY */
307 if( IN6_IS_ADDR_MULTICAST(&sock.sin6_addr) )
309 struct sockaddr_in6 sockany = sock;
310 sockany.sin6_addr = in6addr_any;
311 sockany.sin6_scope_id = 0;
314 if( bind( i_handle, (struct sockaddr *)&sockany, sizeof( sock ) ) < 0 )
316 msg_Warn( p_this, "cannot bind socket (%s)", strerror(errno) );
323 if( bind( i_handle, (struct sockaddr *)&sock, sizeof( sock ) ) < 0 )
325 msg_Warn( p_this, "cannot bind socket (%s)", strerror(errno) );
330 /* Allow broadcast reception if we bound on in6addr_any */
331 if( !*psz_bind_addr )
334 if( setsockopt( i_handle, SOL_SOCKET, SO_BROADCAST,
335 (void*) &i_opt, sizeof( i_opt ) ) == -1 )
337 msg_Warn( p_this, "ipv6 warning: cannot configure socket "
338 "(SO_BROADCAST: %s)", strerror(errno) );
342 /* Join the multicast group if the socket is a multicast address */
343 #if defined( WIN32 ) || defined( HAVE_IF_NAMETOINDEX )
344 if( IN6_IS_ADDR_MULTICAST(&sock.sin6_addr) )
346 struct ipv6_mreq imr;
349 imr.ipv6mr_interface = sock.sin6_scope_id;
350 imr.ipv6mr_multiaddr = sock.sin6_addr;
351 res = setsockopt(i_handle, IPPROTO_IPV6, IPV6_JOIN_GROUP, (void*) &imr,
353 sizeof(imr) + 4); /* Doesn't work without this */
360 msg_Err( p_this, "cannot join multicast group" );
364 msg_Warn( p_this, "Multicast IPv6 is not supported on your OS" );
368 if( *psz_server_addr )
370 int ttl = p_socket->i_ttl;
373 ttl = config_GetInt( p_this, "ttl" );
375 if( ttl < 1 ) ttl = 1;
377 /* Build socket for remote connection */
378 if ( BuildAddr( p_this, &sock, psz_server_addr, i_server_port ) == -1 )
380 msg_Warn( p_this, "cannot build remote address" );
385 /* Connect the socket */
386 if( connect( i_handle, (struct sockaddr *) &sock,
387 sizeof( sock ) ) == (-1) )
389 msg_Warn( p_this, "cannot connect socket (%s)", strerror(errno) );
394 /* Set the time-to-live */
397 #if defined( WIN32 ) || defined( HAVE_IF_NAMETOINDEX )
398 if( IN6_IS_ADDR_MULTICAST(&sock.sin6_addr) )
400 if( setsockopt( i_handle, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
401 (void *)&ttl, sizeof( ttl ) ) < 0 )
404 msg_Err( p_this, "failed to set multicast ttl (%s)",
407 msg_Err( p_this, "failed to set multicast ttl" );
414 if( setsockopt( i_handle, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
415 (void *)&ttl, sizeof( ttl ) ) < 0 )
418 msg_Err( p_this, "failed to set unicast ttl (%s)",
421 msg_Err( p_this, "failed to set unicast ttl" );
428 p_socket->i_handle = i_handle;
429 p_socket->i_mtu = config_GetInt( p_this, "mtu" );
434 /*****************************************************************************
435 * OpenTCP: open a TCP socket
436 *****************************************************************************
437 * psz_server_addr, i_server_port : address and port used for the connect()
438 * system call. If i_server_port == 0, 80 is used.
439 * Other parameters are ignored.
440 * This function returns -1 in case of error.
441 *****************************************************************************/
442 static int OpenTCP( vlc_object_t * p_this, network_socket_t * p_socket )
444 char * psz_server_addr = p_socket->psz_server_addr;
445 int i_server_port = p_socket->i_server_port;
448 struct sockaddr_in6 sock;
450 if( i_server_port == 0 )
455 /* Open a SOCK_STREAM (TCP) socket, in the AF_INET6 domain, automatic (0)
457 if( (i_handle = socket( AF_INET6, SOCK_STREAM, 0 )) == -1 )
459 msg_Warn( p_this, "cannot create socket (%s)", strerror(errno) );
463 /* Build remote address */
464 if ( BuildAddr( p_this, &sock, psz_server_addr, i_server_port ) == -1 )
470 /* Connect the socket */
471 if( connect( i_handle, (struct sockaddr *) &sock,
472 sizeof( sock ) ) == (-1) )
474 msg_Warn( p_this, "cannot connect socket (%s)", strerror(errno) );
479 p_socket->i_handle = i_handle;
480 p_socket->i_mtu = 0; /* There is no MTU notion in TCP */
485 /*****************************************************************************
486 * Open: wrapper around OpenUDP and OpenTCP
487 *****************************************************************************/
488 static int Open( vlc_object_t * p_this )
490 network_socket_t * p_socket = p_this->p_private;
492 if( p_socket->i_type == NETWORK_UDP )
494 return OpenUDP( p_this, p_socket );
498 return OpenTCP( p_this, p_socket );