1 /*****************************************************************************
2 * announce.c : Session announcement
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
6 * Authors: Clément Stenac <zorglub@via.ecp.fr>
7 * Damien Lucas <nitrox@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <errno.h> /* ENOMEM */
28 #include <stdlib.h> /* free() */
29 #include <stdio.h> /* sprintf() */
30 #include <string.h> /* strerror() */
40 # include <winsock2.h>
41 # include <ws2tcpip.h>
43 # define IN_MULTICAST(a) IN_CLASSD(a)
46 # include <sys/socket.h>
54 #define SAP_IPV4_ADDR "224.2.127.254" /* Standard port and address for SAP */
57 #define SAP_IPV6_ADDR_1 "FF0"
58 #define SAP_IPV6_ADDR_2 "::2:7FFE"
60 #define DEFAULT_PORT "1234"
62 /****************************************************************************
63 * Split : split a string into two parts: the one which is before the delim
64 * and the one which is after.
65 * NULL is returned if delim is not found
66 ****************************************************************************/
68 static char * split( char *psz_in, char *psz_out1, char *psz_out2, char delim)
70 unsigned int i_count = 0; /* pos in input string */
71 unsigned int i_pos1 = 0; /* pos in out2 string */
72 unsigned int i_pos2 = 0;
73 char *psz_cur; /* store the pos of the first delim found */
75 /* Skip spaces at the beginning */
76 while( psz_in[i_count] == ' ' )
81 if( psz_in[i_count] == '\0' )
87 while( psz_in[i_count] && psz_in[i_count] != delim )
89 psz_out1[i_pos1] = psz_in[i_count];
93 /* Mark the end of out1 */
94 psz_out1[i_pos1] = '\0';
96 if( psz_in[i_count] == '\0' )
101 /* store pos of the first delim */
102 psz_cur = psz_in + i_count;
104 /* skip all delim and all spaces */
105 while( psz_in[i_count] == ' ' || psz_in[i_count] == delim )
110 if( psz_in[i_count] == '\0' )
115 /* Store the second string */
116 while( psz_in[i_count] )
118 psz_out2[i_pos2] = psz_in[i_count];
122 psz_out2[i_pos2] = '\0';
127 /*****************************************************************************
128 * sout_SAPNew: Creates a SAP Session
129 *****************************************************************************/
130 sap_session_t * sout_SAPNew ( sout_instance_t *p_sout, char * psz_url_arg,
131 char * psz_name_arg, int ip_version,
132 char * psz_v6_scope )
134 sap_session_t *p_sap; /* The SAP structure */
135 module_t *p_network; /* Network module */
136 network_socket_t socket_desc; /* Socket descriptor */
137 char *sap_ipv6_addr = NULL; /* IPv6 built address */
138 char *psz_eol; /* Used to parse IPv6 URIs */
139 int i_port; /* Port in numerical format */
141 /* Allocate the SAP structure */
142 p_sap = (sap_session_t *) malloc( sizeof ( sap_session_t ) ) ;
145 msg_Err( p_sout, "out of memory" );
149 /* Fill the information in the structure */
150 if( strstr( psz_url_arg, "[" ) )
152 /* We have an IPv6 address. Do not use ':' as the port separator */
153 psz_eol = strchr( psz_url_arg, ']' );
156 msg_Warn( p_sout, "no matching ], unable to parse URI");
162 sprintf( p_sap->psz_url, "%s", psz_url_arg );
163 sprintf( p_sap->psz_port, "%s", DEFAULT_PORT );
168 sprintf( p_sap->psz_url, "%s", psz_url_arg );
172 sprintf( p_sap->psz_port, "%s", psz_eol );
178 split( psz_url_arg, p_sap->psz_url, p_sap->psz_port, ':' );
181 /* Check if we have a port */
182 if( !strlen( p_sap->psz_port ) )
184 sprintf( p_sap->psz_port, "%s", DEFAULT_PORT );
187 /* Make sure our port is valid and atoi it */
188 i_port = atoi( p_sap->psz_port );
192 sprintf( p_sap->psz_port, "%s", DEFAULT_PORT );
196 sprintf( p_sap->psz_port, "%i", i_port );
199 /* The name that we send */
200 sprintf( p_sap->psz_name, "%s", psz_name_arg );
202 p_sap->i_ip_version = ip_version;
204 /* Only "6" triggers IPv6. IPv4 is default */
205 if( ip_version != 6 )
207 msg_Dbg( p_sout, "creating IPv4 SAP socket" );
209 /* Fill the socket descriptor */
210 socket_desc.i_type = NETWORK_UDP;
211 socket_desc.psz_bind_addr = "";
212 socket_desc.i_bind_port = 0;
213 socket_desc.psz_server_addr = SAP_IPV4_ADDR;
214 socket_desc.i_server_port = SAP_PORT;
215 socket_desc.i_handle = 0;
217 /* Call the network module */
218 p_sout->p_private = (void*) &socket_desc;
219 if( !( p_network = module_Need( p_sout, "network", "ipv4" ) ) )
221 msg_Warn( p_sout, "failed to open a connection (udp)" );
224 module_Unneed( p_sout, p_network );
226 p_sap->i_socket = socket_desc.i_handle;
227 if( p_sap->i_socket < 0 )
229 msg_Warn( p_sout, "unable to initialize SAP" );
235 msg_Dbg( p_sout, "creating IPv6 SAP socket with scope %s",
238 /* Initialize and build the IPv6 address to broadcast to */
239 sap_ipv6_addr = (char *) malloc( 28 * sizeof(char) );
240 if ( !sap_ipv6_addr )
242 msg_Err( p_sout, "out of memory" );
245 sprintf( sap_ipv6_addr, "%s%c%s",
246 SAP_IPV6_ADDR_1, psz_v6_scope[0], SAP_IPV6_ADDR_2 );
248 /* Fill the socket descriptor */
249 socket_desc.i_type = NETWORK_UDP;
250 socket_desc.psz_bind_addr = "";
251 socket_desc.i_bind_port = 0;
252 socket_desc.psz_server_addr = sap_ipv6_addr;
253 socket_desc.i_server_port = SAP_PORT;
254 socket_desc.i_handle = 0;
256 /* Call the network module */
257 p_sout->p_private = (void *) &socket_desc;
258 if( !( p_network = module_Need( p_sout, "network", "ipv6" ) ) )
260 msg_Warn( p_sout, "failed to open a connection (udp)" );
263 module_Unneed( p_sout, p_network );
265 p_sap->i_socket = socket_desc.i_handle;
266 if( p_sap->i_socket <= 0 )
268 msg_Warn( p_sout, "unable to initialize SAP" );
272 /* Free what we allocated */
275 free( sap_ipv6_addr );
279 msg_Dbg( p_sout, "SAP initialization complete" );
284 /*****************************************************************************
285 * sout_SAPDelete: Deletes a SAP Session
286 *****************************************************************************/
287 void sout_SAPDelete( sout_instance_t *p_sout, sap_session_t * p_sap )
291 #if defined( UNDER_CE )
292 i_ret = CloseHandle( (HANDLE)p_sap->i_socket );
293 #elif defined( WIN32 )
294 i_ret = closesocket( p_sap->i_socket );
296 i_ret = close( p_sap->i_socket );
301 msg_Err( p_sout, "unable to close SAP socket" );
307 /*****************************************************************************
308 * sout_SAPSend: Sends a SAP packet
309 *****************************************************************************/
310 void sout_SAPSend( sout_instance_t *p_sout, sap_session_t * p_sap )
312 char psz_msg[1000]; /* SDP content */
313 char *psz_head; /* SAP header */
314 char *psz_send; /* What we send */
315 char *psz_type = "application/sdp";
316 int i_header_size; /* SAP header size */
317 int i_msg_size; /* SDP content size */
318 int i_size; /* Total size */
321 /* We send a packet every 24 calls to the function */
322 if( p_sap->i_calls++ < 24 )
327 i_header_size = 8 + strlen( psz_type ) + 1;
328 psz_head = (char *) malloc( i_header_size * sizeof( char ) );
332 msg_Err( p_sout, "out of memory" );
336 /* Create the SAP headers */
337 psz_head[0] = 0x20; /* Means IPv4, not encrypted, not compressed */
338 psz_head[1] = 0x00; /* No authentification */
339 psz_head[2] = 0x42; /* Version */
340 psz_head[3] = 0x12; /* Version */
342 psz_head[4] = 0x01; /* Source IP FIXME: we should get the real address */
343 psz_head[5] = 0x02; /* idem */
344 psz_head[6] = 0x03; /* idem */
345 psz_head[7] = 0x04; /* idem */
347 strncpy( psz_head + 8, psz_type, 15 );
348 psz_head[ i_header_size-1 ] = '\0';
350 /* Create the SDP content */
351 /* Do not add spaces at beginning of the lines ! */
352 sprintf( psz_msg, "v=0\n"
353 "o=VideoLAN 3247692199 3247895918 IN IP4 VideoLAN\n"
357 "m=audio %s udp 14\n"
360 p_sap->psz_name, p_sap->psz_port, p_sap->psz_url );
362 i_msg_size = strlen( psz_msg );
363 i_size = i_msg_size + i_header_size;
365 /* Create the message */
366 psz_send = (char *) malloc( i_size*sizeof(char) );
369 msg_Err( p_sout, "out of memory" );
373 memcpy( psz_send, psz_head, i_header_size );
374 memcpy( psz_send + i_header_size, psz_msg, i_msg_size );
376 if( i_size < 1024 ) /* We mustn't send packets larger than 1024B */
378 if( p_sap->i_ip_version == 6 )
380 i_ret = send( p_sap->i_socket, psz_send, i_size, 0 );
384 i_ret = send( p_sap->i_socket, psz_send, i_size, 0 );
390 msg_Warn( p_sout, "SAP send failed on socket %i (%s)",
391 p_sap->i_socket, strerror(errno) );
396 /* Free what we allocated */