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>
52 #define SAP_IPV4_ADDR "224.2.127.254" /* Standard port and address for SAP */
55 #define SAP_IPV6_ADDR_1 "FF0"
56 #define SAP_IPV6_ADDR_2 "::2:7FFE"
58 #define DEFAULT_PORT "1234"
60 /****************************************************************************
61 * Split : split a string into two parts: the one which is before the delim
62 * and the one which is after.
63 * NULL is returned if delim is not found
64 ****************************************************************************/
66 static char * split( char *psz_in, char *psz_out1, char *psz_out2, char delim)
68 unsigned int i_count = 0; /* pos in input string */
69 unsigned int i_pos1 = 0; /* pos in out2 string */
70 unsigned int i_pos2 = 0;
71 char *psz_cur; /* store the pos of the first delim found */
73 /* Skip spaces at the beginning */
74 while( psz_in[i_count] == ' ' )
79 if( psz_in[i_count] == '\0' )
85 while( psz_in[i_count] && psz_in[i_count] != delim )
87 psz_out1[i_pos1] = psz_in[i_count];
91 /* Mark the end of out1 */
92 psz_out1[i_pos1] = '\0';
94 if( psz_in[i_count] == '\0' )
99 /* store pos of the first delim */
100 psz_cur = psz_in + i_count;
102 /* skip all delim and all spaces */
103 while( psz_in[i_count] == ' ' || psz_in[i_count] == delim )
108 if( psz_in[i_count] == '\0' )
113 /* Store the second string */
114 while( psz_in[i_count] )
116 psz_out2[i_pos2] = psz_in[i_count];
120 psz_out2[i_pos2] = '\0';
125 /*****************************************************************************
126 * sout_SAPNew: Creates a SAP Session
127 *****************************************************************************/
128 sap_session_t * sout_SAPNew ( sout_instance_t *p_sout, char * psz_url_arg,
129 char * psz_name_arg, int ip_version,
130 char * psz_v6_scope )
132 sap_session_t *p_sap; /* The SAP structure */
133 module_t *p_network; /* Network module */
134 network_socket_t socket_desc; /* Socket descriptor */
135 char *sap_ipv6_addr = NULL; /* IPv6 built address */
136 char *psz_eol; /* Used to parse IPv6 URIs */
137 int i_port; /* Port in numerical format */
139 /* Allocate the SAP structure */
140 p_sap = (sap_session_t *) malloc( sizeof ( sap_session_t ) ) ;
143 msg_Err( p_sout, "out of memory" );
147 /* Fill the information in the structure */
148 if( strstr( psz_url_arg, "[" ) )
150 /* We have an IPv6 address. Do not use ':' as the port separator */
151 psz_eol = strchr( psz_url_arg, ']' );
154 msg_Warn( p_sout, "no matching ], unable to parse URI");
160 sprintf( p_sap->psz_url, "%s", psz_url_arg );
161 sprintf( p_sap->psz_port, "%s", DEFAULT_PORT );
166 sprintf( p_sap->psz_url, "%s", psz_url_arg );
170 sprintf( p_sap->psz_port, "%s", psz_eol );
176 split( psz_url_arg, p_sap->psz_url, p_sap->psz_port, ':' );
179 /* Check if we have a port */
180 if( !strlen( p_sap->psz_port ) )
182 sprintf( p_sap->psz_port, "%s", DEFAULT_PORT );
185 /* Make sure our port is valid and atoi it */
186 i_port = atoi( p_sap->psz_port );
190 sprintf( p_sap->psz_port, "%s", DEFAULT_PORT );
194 sprintf( p_sap->psz_port, "%i", i_port );
197 /* The name that we send */
198 sprintf( p_sap->psz_name, "%s", psz_name_arg );
200 p_sap->i_ip_version = ip_version;
202 /* Only "6" triggers IPv6. IPv4 is default */
203 if( ip_version != 6 )
205 msg_Dbg( p_sout, "creating IPv4 SAP socket" );
207 /* Fill the socket descriptor */
208 socket_desc.i_type = NETWORK_UDP;
209 socket_desc.psz_bind_addr = "";
210 socket_desc.i_bind_port = 0;
211 socket_desc.psz_server_addr = SAP_IPV4_ADDR;
212 socket_desc.i_server_port = SAP_PORT;
213 socket_desc.i_handle = 0;
215 /* Call the network module */
216 p_sout->p_private = (void*) &socket_desc;
217 if( !( p_network = module_Need( p_sout, "network", "ipv4" ) ) )
219 msg_Warn( p_sout, "failed to open a connection (udp)" );
222 module_Unneed( p_sout, p_network );
224 p_sap->i_socket = socket_desc.i_handle;
225 if( p_sap->i_socket < 0 )
227 msg_Warn( p_sout, "unable to initialize SAP" );
233 msg_Dbg( p_sout, "creating IPv6 SAP socket with scope %s",
236 /* Initialize and build the IPv6 address to broadcast to */
237 sap_ipv6_addr = (char *) malloc( 28 * sizeof(char) );
238 if ( !sap_ipv6_addr )
240 msg_Err( p_sout, "out of memory" );
243 sprintf( sap_ipv6_addr, "%s%c%s",
244 SAP_IPV6_ADDR_1, psz_v6_scope[0], SAP_IPV6_ADDR_2 );
246 /* Fill the socket descriptor */
247 socket_desc.i_type = NETWORK_UDP;
248 socket_desc.psz_bind_addr = "";
249 socket_desc.i_bind_port = 0;
250 socket_desc.psz_server_addr = sap_ipv6_addr;
251 socket_desc.i_server_port = SAP_PORT;
252 socket_desc.i_handle = 0;
254 /* Call the network module */
255 p_sout->p_private = (void *) &socket_desc;
256 if( !( p_network = module_Need( p_sout, "network", "ipv6" ) ) )
258 msg_Warn( p_sout, "failed to open a connection (udp)" );
261 module_Unneed( p_sout, p_network );
263 p_sap->i_socket = socket_desc.i_handle;
264 if( p_sap->i_socket <= 0 )
266 msg_Warn( p_sout, "unable to initialize SAP" );
270 /* Free what we allocated */
273 free( sap_ipv6_addr );
277 msg_Dbg( p_sout, "SAP initialization complete" );
282 /*****************************************************************************
283 * sout_SAPDelete: Deletes a SAP Session
284 *****************************************************************************/
285 void sout_SAPDelete( sout_instance_t *p_sout, sap_session_t * p_sap )
289 #if defined( UNDER_CE )
290 i_ret = CloseHandle( (HANDLE)p_sap->i_socket );
291 #elif defined( WIN32 )
292 i_ret = closesocket( p_sap->i_socket );
294 i_ret = close( p_sap->i_socket );
299 msg_Err( p_sout, "unable to close SAP socket" );
305 /*****************************************************************************
306 * sout_SAPSend: Sends a SAP packet
307 *****************************************************************************/
308 void sout_SAPSend( sout_instance_t *p_sout, sap_session_t * p_sap )
310 char psz_msg[1000]; /* SDP content */
311 char *psz_head; /* SAP header */
312 char *psz_send; /* What we send */
313 char *psz_type = "application/sdp";
314 int i_header_size; /* SAP header size */
315 int i_msg_size; /* SDP content size */
316 int i_size; /* Total size */
319 /* We send a packet every 24 calls to the function */
320 if( p_sap->i_calls++ < 24 )
325 i_header_size = 8 + strlen( psz_type ) + 1;
326 psz_head = (char *) malloc( i_header_size * sizeof( char ) );
330 msg_Err( p_sout, "out of memory" );
334 /* Create the SAP headers */
335 psz_head[0] = 0x20; /* Means IPv4, not encrypted, not compressed */
336 psz_head[1] = 0x00; /* No authentification */
337 psz_head[2] = 0x42; /* Version */
338 psz_head[3] = 0x12; /* Version */
340 psz_head[4] = 0x01; /* Source IP FIXME: we should get the real address */
341 psz_head[5] = 0x02; /* idem */
342 psz_head[6] = 0x03; /* idem */
343 psz_head[7] = 0x04; /* idem */
345 strncpy( psz_head + 8, psz_type, 15 );
346 psz_head[ i_header_size-1 ] = '\0';
348 /* Create the SDP content */
349 /* Do not add spaces at beginning of the lines ! */
350 sprintf( psz_msg, "v=0\n"
351 "o=VideoLAN 3247692199 3247895918 IN IP4 VideoLAN\n"
355 "m=audio %s udp 14\n"
358 p_sap->psz_name, p_sap->psz_port, p_sap->psz_url );
360 i_msg_size = strlen( psz_msg );
361 i_size = i_msg_size + i_header_size;
363 /* Create the message */
364 psz_send = (char *) malloc( i_size*sizeof(char) );
367 msg_Err( p_sout, "out of memory" );
371 memcpy( psz_send, psz_head, i_header_size );
372 memcpy( psz_send + i_header_size, psz_msg, i_msg_size );
374 if( i_size < 1024 ) /* We mustn't send packets larger than 1024B */
376 i_ret = send( p_sap->i_socket, psz_send, i_size, 0 );
381 msg_Warn( p_sout, "SAP send failed on socket %i (%s)",
382 p_sap->i_socket, strerror(errno) );
387 /* Free what we allocated */