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() */
41 #define SAP_IPV4_ADDR "224.2.127.254" /* Standard port and address for SAP */
44 #define SAP_IPV6_ADDR_1 "FF0"
45 #define SAP_IPV6_ADDR_2 "::2:7FFE"
47 /*****************************************************************************
48 * sout_SAPNew: Creates a SAP Session
49 *****************************************************************************/
50 sap_session_t * sout_SAPNew ( sout_instance_t *p_sout ,
51 char * psz_url_arg , char *psz_port_arg ,
52 char * psz_name_arg, int ip_version,
56 sap_session_t *p_new; /* The SAP structure */
57 module_t *p_network; /* Network module */
58 network_socket_t socket_desc; /* Socket descriptor */
59 char psz_network[6]; /* IPv4 or IPv6 */
60 struct sockaddr_in addr; /* IPv4 connection structure */
61 struct sockaddr_in6 addr6;/* IPv6 connection structure */
62 char *sap_ipv6_addr=NULL; /* IPv6 built address */
63 void *net_ipv6_addr=NULL; /* IPv6 address in net-format */
64 int i_status=0; /* Problems on system calls*/
66 /* Allocate the SAP structure */
67 p_new = (sap_session_t *)malloc( sizeof ( sap_session_t ) ) ;
70 msg_Err( p_sout, "No memory left" );
74 /* Fill the information in the structure */
75 sprintf ( p_new->psz_url , "%s" , psz_url_arg );
76 sprintf ( p_new->psz_name , "%s" , psz_name_arg );
77 /* Port is not implemented in sout */
78 sprintf ( p_new->psz_port, "%s" , psz_port_arg );
80 p_new->i_ip_version = ip_version;
82 /* Only "6" triggers IPv6. IPv4 is default */
85 msg_Dbg( p_sout , "Creating IPv4 SAP socket" );
87 /* Fill the socket descriptor */
88 socket_desc.i_type = NETWORK_UDP;
89 socket_desc.psz_bind_addr = "";
90 socket_desc.i_bind_port = 0;
91 socket_desc.psz_server_addr = SAP_IPV4_ADDR;
92 socket_desc.i_server_port = SAP_PORT;
93 socket_desc.i_handle = 0;
95 /* Call the network module */
96 sprintf ( psz_network, "ipv4" );
97 p_sout->p_private=(void*) &socket_desc;
98 if( !( p_network = module_Need( p_sout, "network", psz_network ) ) )
100 msg_Warn( p_sout, "failed to open a connection (udp)" );
103 module_Unneed( p_sout, p_network );
105 p_new->socket = socket_desc.i_handle;
106 if(p_new->socket <= 0 )
108 msg_Warn( p_sout, "Unable to initialize SAP" );
112 /* Fill the sockaddr_in structure */
113 memset( &addr , 0 , sizeof(addr) );
114 addr.sin_family = AF_INET;
115 addr.sin_addr.s_addr = inet_addr(SAP_IPV4_ADDR);
116 addr.sin_port = htons( SAP_PORT );
121 msg_Dbg(p_sout , "Creating IPv6 SAP socket with scope %s"
124 /* Initialize and build the IPv6 address to broadcast to */
125 sap_ipv6_addr = (char *)malloc(28*sizeof(char));
126 if ( !sap_ipv6_addr )
128 msg_Err( p_sout, "No memory left" );
131 sprintf(sap_ipv6_addr,"%s%c%s",
136 /* Convert it to network format */
137 net_ipv6_addr = (struct in6_addr *)malloc( sizeof(struct in6_addr) );
138 if ( !net_ipv6_addr )
140 msg_Err( p_sout, "No memory left" );
145 i_status = inet_pton(AF_INET6,sap_ipv6_addr,net_ipv6_addr);
149 msg_Warn(p_sout,"Unable to convert address to network format");
152 else if(i_status == 0)
154 msg_Warn(p_sout,"Adresse de diffusion SAP invalide");
158 /* Fill the socket descriptor */
159 socket_desc.i_type = NETWORK_UDP;
160 socket_desc.psz_bind_addr = "";
161 socket_desc.i_bind_port = 0;
162 socket_desc.psz_server_addr = sap_ipv6_addr;
163 socket_desc.i_server_port = SAP_PORT;
164 socket_desc.i_handle = 0;
166 sprintf ( psz_network, "ipv6" );
168 /* Call the network module */
169 p_sout->p_private=(void*) &socket_desc;
170 if( !( p_network = module_Need( p_sout, "network", psz_network ) ) )
172 msg_Warn( p_sout, "failed to open a connection (udp)" );
175 module_Unneed( p_sout, p_network );
177 p_new->socket = socket_desc.i_handle;
179 if(p_new->socket <= 0 )
181 msg_Warn( p_sout, "Unable to initialize SAP" );
185 /* Fill the sockaddr_in structure */
186 memset( &addr6 , 0 , sizeof(addr6) );
187 addr6.sin6_family = AF_INET6;
188 memcpy( &addr6.sin6_addr.s6_addr , net_ipv6_addr ,
189 sizeof(addr6.sin6_addr.s6_addr) );
191 addr6.sin6_port = htons( SAP_PORT );
192 p_new->addr6 = addr6;
194 /* Free what we allocated */
195 if( sap_ipv6_addr ) free(sap_ipv6_addr);
196 if( net_ipv6_addr ) free(net_ipv6_addr);
199 msg_Dbg (p_sout,"SAP initialization complete");
204 /*****************************************************************************
205 * sout_SAPDelete: Deletes a SAP Session
206 *****************************************************************************/
207 void sout_SAPDelete( sout_instance_t *p_sout , sap_session_t * p_this )
209 if( close(p_this->socket) )
210 msg_Err ( p_sout, "Unable to close SAP socket");
212 if( p_this ) free( p_this );
215 /*****************************************************************************
216 * sout_SAPSend: Sends a SAP packet
217 *****************************************************************************/
218 void sout_SAPSend( sout_instance_t *p_sout, sap_session_t * p_this)
221 char *sap_head; /* SAP header */
222 char sap_msg[1000]; /* SDP content */
223 char *sap_send; /* What we send */
224 char *payload_type="application/sdp";
225 int i_send_result=0; /* Result of send */
227 int i_header_size; /* SAP header size */
228 int i_msg_size; /* SDP content size */
229 int i_size; /* Total size */
231 /* We send a packet every 24 calls to the function */
232 if( p_this->sendnow == 24 )
234 i_header_size = 9 + strlen( payload_type );
235 sap_head = ( char * )malloc( i_header_size * sizeof( char ) );
239 msg_Warn( p_sout , "No memory left");
243 /* Create the SAP headers */
244 sap_head[0]=0x20; /* Means IPv4, not encrypted, not compressed */
245 sap_head[1]=0x00; /* No authentification */
246 sap_head[2]=0x42; /* Version */
247 sap_head[3]=0x12; /* Version */
249 sap_head[4]=0x01; /* Source IP FIXME: we should get the real address */
250 sap_head[5]=0x02; /* idem */
251 sap_head[6]=0x03; /* idem */
252 sap_head[7]=0x04; /* idem */
254 strncpy( sap_head+8 , payload_type , 15 );
255 sap_head[ i_header_size-1 ] = '\0';
257 /* Create the SDP content */
258 /* Do not add spaces at beginning of the lines ! */
259 sprintf(sap_msg,"v=0\n\
260 o=VideoLAN 3247692199 3247895918 IN IP4 VideoLAN\n\
266 a=type:test\n", p_this->psz_name , p_this->psz_port , p_this->psz_url );
268 i_msg_size = strlen( sap_msg );
269 i_size = i_msg_size + i_header_size;
271 /* Create the message */
272 sap_send = ( char* )malloc( i_size*sizeof(char) );
275 msg_Err( p_sout , "No memory left") ;
279 for(i=0 ; i<i_header_size ; i++)
281 sap_send[i] = sap_head[i];
284 for( ; i<i_size; i++)
286 sap_send[i] = sap_msg[i-i_header_size];
289 if(i_size<1024) /* We mustn't send packets larger than 1024B */
291 if( p_this->i_ip_version == 6)
293 i_send_result = sendto( p_this->socket , sap_send ,
295 (struct sockaddr *)&p_this->addr6,
296 sizeof(p_this->addr6) );
300 i_send_result = sendto( p_this->socket , sap_send ,
302 (struct sockaddr *)&p_this->addr ,
303 sizeof(p_this->addr) );
307 if(i_send_result == -1)
309 msg_Warn(p_sout , "SAP Send failed on socket %i. " ,
316 /* Free what we allocated */
317 if(sap_send) free(sap_send);
318 if(sap_head) free(sap_head);