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 <stdlib.h> /* free() */
28 #include <stdio.h> /* sprintf() */
29 #include <string.h> /* strerror() */
39 # include <winsock2.h>
40 # include <ws2tcpip.h>
42 # define IN_MULTICAST(a) IN_CLASSD(a)
45 # include <sys/socket.h>
53 #define SAP_IPV4_ADDR "224.2.127.254" /* Standard port and address for SAP */
56 #define SAP_IPV6_ADDR_1 "FF0"
57 #define SAP_IPV6_ADDR_2 "::2:7FFE"
59 #define DEFAULT_PORT "1234"
61 /****************************************************************************
62 * Split : split a string into two parts: the one which is before the delim
63 * and the one which is after.
64 * NULL is returned if delim is not found
65 ****************************************************************************/
67 static char * split( char *psz_in, char *psz_out1, char *psz_out2, char delim)
69 unsigned int i_count = 0; /* pos in input string */
70 unsigned int i_pos1 = 0; /* pos in out2 string */
71 unsigned int i_pos2 = 0;
72 char *psz_cur; /* store the pos of the first delim found */
74 /* Skip spaces at the beginning */
75 while( psz_in[i_count] == ' ' )
80 if( psz_in[i_count] == '\0' )
86 while( psz_in[i_count] && psz_in[i_count] != delim )
88 psz_out1[i_pos1] = psz_in[i_count];
92 /* Mark the end of out1 */
93 psz_out1[i_pos1] = '\0';
95 if( psz_in[i_count] == '\0' )
100 /* store pos of the first delim */
101 psz_cur = psz_in + i_count;
103 /* skip all delim and all spaces */
104 while( psz_in[i_count] == ' ' || psz_in[i_count] == delim )
109 if( psz_in[i_count] == '\0' )
114 /* Store the second string */
115 while( psz_in[i_count] )
117 psz_out2[i_pos2] = psz_in[i_count];
121 psz_out2[i_pos2] = '\0';
126 /*****************************************************************************
127 * sout_SAPNew: Creates a SAP Session
128 *****************************************************************************/
129 sap_session_t * sout_SAPNew ( sout_instance_t *p_sout, char * psz_url_arg,
130 char * psz_name_arg, int ip_version,
131 char * psz_v6_scope )
133 sap_session_t *p_sap; /* The SAP structure */
134 module_t *p_network; /* Network module */
135 network_socket_t socket_desc; /* Socket descriptor */
136 char *sap_ipv6_addr = NULL; /* IPv6 built address */
137 char *psz_eol; /* Used to parse IPv6 URIs */
138 int i_port; /* Port in numerical format */
140 /* Allocate the SAP structure */
141 p_sap = (sap_session_t *) malloc( sizeof ( sap_session_t ) ) ;
144 msg_Err( p_sout, "out of memory" );
148 /* Fill the information in the structure */
149 if( strstr( psz_url_arg, "[" ) )
151 /* We have an IPv6 address. Do not use ':' as the port separator */
152 psz_eol = strchr( psz_url_arg, ']' );
155 msg_Warn( p_sout, "no matching ], unable to parse URI");
161 sprintf( p_sap->psz_url, "%s", psz_url_arg );
162 sprintf( p_sap->psz_port, "%s", DEFAULT_PORT );
167 sprintf( p_sap->psz_url, "%s", psz_url_arg );
171 sprintf( p_sap->psz_port, "%s", psz_eol );
177 split( psz_url_arg, p_sap->psz_url, p_sap->psz_port, ':' );
180 /* Check if we have a port */
181 if( !strlen( p_sap->psz_port ) )
183 sprintf( p_sap->psz_port, "%s", DEFAULT_PORT );
186 /* Make sure our port is valid and atoi it */
187 i_port = atoi( p_sap->psz_port );
191 sprintf( p_sap->psz_port, "%s", DEFAULT_PORT );
195 sprintf( p_sap->psz_port, "%i", i_port );
198 /* The name that we send */
199 sprintf( p_sap->psz_name, "%s", psz_name_arg );
201 p_sap->i_ip_version = ip_version;
203 /* Only "6" triggers IPv6. IPv4 is default */
204 if( ip_version != 6 )
206 msg_Dbg( p_sout, "creating IPv4 SAP socket" );
208 /* Fill the socket descriptor */
209 socket_desc.i_type = NETWORK_UDP;
210 socket_desc.psz_bind_addr = "";
211 socket_desc.i_bind_port = 0;
212 socket_desc.psz_server_addr = SAP_IPV4_ADDR;
213 socket_desc.i_server_port = SAP_PORT;
214 socket_desc.i_handle = 0;
216 /* Call the network module */
217 p_sout->p_private = (void*) &socket_desc;
218 if( !( p_network = module_Need( p_sout, "network", "ipv4" ) ) )
220 msg_Warn( p_sout, "failed to open a connection (udp)" );
223 module_Unneed( p_sout, p_network );
225 p_sap->i_socket = socket_desc.i_handle;
226 if( p_sap->i_socket < 0 )
228 msg_Warn( p_sout, "unable to initialize SAP" );
234 msg_Dbg( p_sout, "creating IPv6 SAP socket with scope %s",
237 /* Initialize and build the IPv6 address to broadcast to */
238 sap_ipv6_addr = (char *) malloc( 28 * sizeof(char) );
239 if ( !sap_ipv6_addr )
241 msg_Err( p_sout, "out of memory" );
244 sprintf( sap_ipv6_addr, "%s%c%s",
245 SAP_IPV6_ADDR_1, psz_v6_scope[0], SAP_IPV6_ADDR_2 );
247 /* Fill the socket descriptor */
248 socket_desc.i_type = NETWORK_UDP;
249 socket_desc.psz_bind_addr = "";
250 socket_desc.i_bind_port = 0;
251 socket_desc.psz_server_addr = sap_ipv6_addr;
252 socket_desc.i_server_port = SAP_PORT;
253 socket_desc.i_handle = 0;
255 /* Call the network module */
256 p_sout->p_private = (void *) &socket_desc;
257 if( !( p_network = module_Need( p_sout, "network", "ipv6" ) ) )
259 msg_Warn( p_sout, "failed to open a connection (udp)" );
262 module_Unneed( p_sout, p_network );
264 p_sap->i_socket = socket_desc.i_handle;
265 if( p_sap->i_socket <= 0 )
267 msg_Warn( p_sout, "unable to initialize SAP" );
271 /* Free what we allocated */
274 free( sap_ipv6_addr );
278 msg_Dbg( p_sout, "SAP initialization complete" );
283 /*****************************************************************************
284 * sout_SAPDelete: Deletes a SAP Session
285 *****************************************************************************/
286 void sout_SAPDelete( sout_instance_t *p_sout, sap_session_t * p_sap )
290 #if defined( UNDER_CE )
291 i_ret = CloseHandle( (HANDLE)p_sap->i_socket );
292 #elif defined( WIN32 )
293 i_ret = closesocket( p_sap->i_socket );
295 i_ret = close( p_sap->i_socket );
300 msg_Err( p_sout, "unable to close SAP socket" );
306 /*****************************************************************************
307 * sout_SAPSend: Sends a SAP packet
308 *****************************************************************************/
309 void sout_SAPSend( sout_instance_t *p_sout, sap_session_t * p_sap )
311 char psz_msg[1000]; /* SDP content */
312 char *psz_head; /* SAP header */
313 char *psz_send; /* What we send */
314 char *psz_type = "application/sdp";
315 int i_header_size; /* SAP header size */
316 int i_msg_size; /* SDP content size */
317 int i_size; /* Total size */
320 /* We send a packet every 24 calls to the function */
321 if( p_sap->i_calls++ < 24 )
326 i_header_size = 8 + strlen( psz_type ) + 1;
327 psz_head = (char *) malloc( i_header_size * sizeof( char ) );
331 msg_Err( p_sout, "out of memory" );
335 /* Create the SAP headers */
336 psz_head[0] = 0x20; /* Means IPv4, not encrypted, not compressed */
337 psz_head[1] = 0x00; /* No authentification */
338 psz_head[2] = 0x42; /* Version */
339 psz_head[3] = 0x12; /* Version */
341 psz_head[4] = 0x01; /* Source IP FIXME: we should get the real address */
342 psz_head[5] = 0x02; /* idem */
343 psz_head[6] = 0x03; /* idem */
344 psz_head[7] = 0x04; /* idem */
346 strncpy( psz_head + 8, psz_type, 15 );
347 psz_head[ i_header_size-1 ] = '\0';
349 /* Create the SDP content */
350 /* Do not add spaces at beginning of the lines ! */
351 sprintf( psz_msg, "v=0\n"
352 "o=VideoLAN 3247692199 3247895918 IN IP4 VideoLAN\n"
356 "m=audio %s udp 14\n"
359 p_sap->psz_name, p_sap->psz_port, p_sap->psz_url );
361 i_msg_size = strlen( psz_msg );
362 i_size = i_msg_size + i_header_size;
364 /* Create the message */
365 psz_send = (char *) malloc( i_size*sizeof(char) );
368 msg_Err( p_sout, "out of memory" );
372 memcpy( psz_send, psz_head, i_header_size );
373 memcpy( psz_send + i_header_size, psz_msg, i_msg_size );
375 if( i_size < 1024 ) /* We mustn't send packets larger than 1024B */
377 if( p_sap->i_ip_version == 6 )
379 i_ret = send( p_sap->i_socket, psz_send, i_size, 0 );
383 i_ret = send( p_sap->i_socket, psz_send, i_size, 0 );
389 msg_Warn( p_sout, "SAP send failed on socket %i (%s)",
390 p_sap->i_socket, strerror(errno) );
395 /* Free what we allocated */