1 /*****************************************************************************
2 * ipv6.c: IPv6 network abstraction layer
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: ipv6.c,v 1.2 2002/08/08 00:35:11 sam 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 20
70 /*****************************************************************************
72 *****************************************************************************/
73 static int Open( vlc_object_t * );
75 /*****************************************************************************
77 *****************************************************************************/
79 set_description( _("IPv6 network abstraction layer") );
80 set_capability( "network", 40 );
81 set_callbacks( Open, NULL );
84 /*****************************************************************************
85 * BuildAddr: utility function to build a struct sockaddr_in6
86 *****************************************************************************/
87 static int BuildAddr( struct sockaddr_in6 * p_socket,
88 char * psz_address, int i_port )
90 char * psz_multicast_interface = "";
93 /* Try to get getaddrinfo() and freeaddrinfo() from wship6.dll */
94 typedef int (CALLBACK * GETADDRINFO) ( const char *nodename,
96 const struct addrinfo *hints,
97 struct addrinfo **res );
98 typedef void (CALLBACK * FREEADDRINFO) ( struct addrinfo FAR *ai );
100 struct addrinfo hints, *res;
101 GETADDRINFO _getaddrinfo = NULL;
102 FREEADDRINFO _freeaddrinfo = NULL;
104 HINSTANCE wship6_dll = LoadLibrary("wship6.dll");
107 _getaddrinfo = (GETADDRINFO) GetProcAddress( wship6_dll,
109 _freeaddrinfo = (FREEADDRINFO) GetProcAddress( wship6_dll,
112 if( !_getaddrinfo || !_freeaddrinfo )
114 /* msg_Err( p_this, "no IPv6 stack installed" ); */
115 if( wship6_dll ) FreeLibrary( wship6_dll );
121 memset( p_socket, 0, sizeof( struct sockaddr_in6 ) );
122 p_socket->sin6_family = AF_INET6; /* family */
123 p_socket->sin6_port = htons( i_port );
126 p_socket->sin6_addr = in6addr_any;
128 else if( psz_address[0] == '['
129 && psz_address[strlen(psz_address) - 1] == ']' )
132 /* see if there is an interface name in there... */
133 if( (psz_multicast_interface = strchr(psz_address, '%')) != NULL )
135 *psz_multicast_interface = '\0';
136 psz_multicast_interface++;
138 msg_Dbg( p_this, "Interface name specified: \"%s\"",
139 psz_multicast_interface );
141 /* now convert that interface name to an index */
142 #if !defined( WIN32 )
143 p_socket->sin6_scope_id = if_nametoindex(psz_multicast_interface);
145 /* FIXME: for now we always use the default interface */
146 p_socket->sin6_scope_id = 0;
149 msg_Warn( p_this, " = #%i\n", p_socket->sin6_scope_id );
152 psz_address[strlen(psz_address) - 1] = '\0' ;
154 #if !defined( WIN32 )
155 inet_pton(AF_INET6, psz_address, &p_socket->sin6_addr.s6_addr);
158 memset(&hints, 0, sizeof(hints));
159 hints.ai_family = AF_INET6;
160 hints.ai_flags = AI_NUMERICHOST;
162 if( _getaddrinfo( psz_address, NULL, &hints, &res ) )
164 FreeLibrary( wship6_dll );
167 memcpy( &p_socket->sin6_addr,
168 &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr,
169 sizeof(struct in6_addr) );
170 _freeaddrinfo( res );
176 #ifdef HAVE_GETHOSTBYNAME2
177 struct hostent * p_hostent;
179 /* We have a fqdn, try to find its address */
180 if ( (p_hostent = gethostbyname2( psz_address, AF_INET6 )) == NULL )
183 intf_ErrMsg( "ipv6 error: unknown host %s", psz_address );
188 /* Copy the first address of the host in the socket address */
189 memcpy( &p_socket->sin6_addr, p_hostent->h_addr_list[0],
190 p_hostent->h_length );
193 if( _getaddrinfo( psz_address, NULL, &hints, &res ) )
195 FreeLibrary( wship6_dll );
198 memcpy( &p_socket->sin6_addr,
199 &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr,
200 sizeof(struct in6_addr) );
201 _freeaddrinfo( res );
205 intf_ErrMsg( "ipv6 error: IPv6 address %s is invalid", psz_address );
212 FreeLibrary( wship6_dll );
218 /*****************************************************************************
219 * OpenUDP: open a UDP socket
220 *****************************************************************************
221 * psz_bind_addr, i_bind_port : address and port used for the bind()
222 * system call. If psz_bind_addr == NULL, the socket is bound to
223 * in6addr_any and broadcast reception is enabled. If i_bind_port == 0,
224 * 1234 is used. If psz_bind_addr is a multicast (class D) address,
225 * join the multicast group.
226 * psz_server_addr, i_server_port : address and port used for the connect()
227 * system call. It can avoid receiving packets from unauthorized IPs.
228 * Its use leads to great confusion and is currently discouraged.
229 * This function returns -1 in case of error.
230 *****************************************************************************/
231 static int OpenUDP( vlc_object_t * p_this, network_socket_t * p_socket )
233 char * psz_bind_addr = p_socket->psz_bind_addr;
234 int i_bind_port = p_socket->i_bind_port;
235 char * psz_server_addr = p_socket->psz_server_addr;
236 int i_server_port = p_socket->i_server_port;
239 unsigned int i_opt_size;
240 struct sockaddr_in6 sock;
242 /* Open a SOCK_DGRAM (UDP) socket, in the AF_INET6 domain, automatic (0)
244 if( (i_handle = socket( AF_INET6, SOCK_DGRAM, 0 )) == -1 )
246 msg_Err( p_this, "cannot create socket (%s)", strerror(errno) );
250 /* We may want to reuse an already used socket */
252 if( setsockopt( i_handle, SOL_SOCKET, SO_REUSEADDR,
253 (void *) &i_opt, sizeof( i_opt ) ) == -1 )
255 msg_Err( p_this, "cannot configure socket (SO_REUSEADDR: %s)",
261 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s) to avoid
262 * packet loss caused by scheduling problems */
264 if( setsockopt( i_handle, SOL_SOCKET, SO_RCVBUF,
265 (void *) &i_opt, sizeof( i_opt ) ) == -1 )
267 msg_Warn( p_this, "cannot configure socket (SO_RCVBUF: %s)",
271 /* Check if we really got what we have asked for, because Linux, etc.
272 * will silently limit the max buffer size to net.core.rmem_max which
273 * is typically only 65535 bytes */
275 i_opt_size = sizeof( i_opt );
276 if( getsockopt( i_handle, SOL_SOCKET, SO_RCVBUF,
277 (void*) &i_opt, &i_opt_size ) == -1 )
279 msg_Warn( p_this, "cannot query socket (SO_RCVBUF: %s)",
282 else if( i_opt < 0x80000 )
284 msg_Warn( p_this, "socket buffer size is 0x%x instead of 0x%x",
288 /* Build the local socket */
289 if ( BuildAddr( &sock, psz_bind_addr, i_bind_port ) == -1 )
296 if( bind( i_handle, (struct sockaddr *)&sock, sizeof( sock ) ) < 0 )
298 msg_Err( p_this, "cannot bind socket (%s)", strerror(errno) );
303 /* Allow broadcast reception if we bound on in6addr_any */
304 if( !*psz_bind_addr )
307 if( setsockopt( i_handle, SOL_SOCKET, SO_BROADCAST,
308 (void*) &i_opt, sizeof( i_opt ) ) == -1 )
310 msg_Warn( p_this, "ipv6 warning: cannot configure socket "
311 "(SO_BROADCAST: %s)", strerror(errno) );
315 /* Join the multicast group if the socket is a multicast address */
316 if( IN6_IS_ADDR_MULTICAST(&sock.sin6_addr) )
318 struct ipv6_mreq imr;
321 imr.ipv6mr_interface = sock.sin6_scope_id;
322 imr.ipv6mr_multiaddr = sock.sin6_addr;
323 res = setsockopt(i_handle, IPPROTO_IPV6, IPV6_JOIN_GROUP, (void*) &imr,
328 msg_Err( p_this, "setsockopt JOIN_GROUP failed" );
333 if( *psz_server_addr )
335 /* Build socket for remote connection */
336 if ( BuildAddr( &sock, psz_server_addr, i_server_port ) == -1 )
338 msg_Err( p_this, "cannot build remote address" );
343 /* Connect the socket */
344 if( connect( i_handle, (struct sockaddr *) &sock,
345 sizeof( sock ) ) == (-1) )
347 msg_Err( p_this, "cannot connect socket (%s)", strerror(errno) );
353 p_socket->i_handle = i_handle;
354 p_socket->i_mtu = config_GetInt( p_this, "mtu" );
359 /*****************************************************************************
360 * OpenTCP: open a TCP socket
361 *****************************************************************************
362 * psz_server_addr, i_server_port : address and port used for the connect()
363 * system call. If i_server_port == 0, 80 is used.
364 * Other parameters are ignored.
365 * This function returns -1 in case of error.
366 *****************************************************************************/
367 static int OpenTCP( vlc_object_t * p_this, network_socket_t * p_socket )
369 char * psz_server_addr = p_socket->psz_server_addr;
370 int i_server_port = p_socket->i_server_port;
373 struct sockaddr_in6 sock;
375 if( i_server_port == 0 )
380 /* Open a SOCK_STREAM (TCP) socket, in the AF_INET6 domain, automatic (0)
382 if( (i_handle = socket( AF_INET6, SOCK_STREAM, 0 )) == -1 )
384 msg_Err( p_this, "cannot create socket (%s)", strerror(errno) );
388 /* Build remote address */
389 if ( BuildAddr( &sock, psz_server_addr, i_server_port ) == -1 )
395 /* Connect the socket */
396 if( connect( i_handle, (struct sockaddr *) &sock,
397 sizeof( sock ) ) == (-1) )
399 msg_Err( p_this, "cannot connect socket (%s)", strerror(errno) );
404 p_socket->i_handle = i_handle;
405 p_socket->i_mtu = 0; /* There is no MTU notion in TCP */
410 /*****************************************************************************
411 * Open: wrapper around OpenUDP and OpenTCP
412 *****************************************************************************/
413 static int Open( vlc_object_t * p_this )
415 network_socket_t * p_socket = p_this->p_private;
417 if( p_socket->i_type == NETWORK_UDP )
419 return OpenUDP( p_this, p_socket );
423 return OpenTCP( p_this, p_socket );