1 /*****************************************************************************
2 * sap.c : SAP announce handler
3 *****************************************************************************
4 * Copyright (C) 2002-2007 the VideoLAN team
7 * Authors: Clément Stenac <zorglub@videolan.org>
8 * Rémi Denis-Courmont <rem # videolan.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <vlc_common.h>
35 #include <stdlib.h> /* free() */
36 #include <stdio.h> /* sprintf() */
38 #include <ctype.h> /* tolower(), isxdigit() */
42 #include <vlc_network.h>
43 #include <vlc_charset.h>
45 #include "stream_output.h"
48 /* SAP is always on that port */
51 #define DEFAULT_PORT "1234"
55 /* SAP Specific structures */
58 #define SAP_IDLE ((mtime_t)(0.100*CLOCK_FREQ))
59 #define SAP_MAX_BUFFER 65534
60 #define MIN_INTERVAL 2
61 #define MAX_INTERVAL 300
63 /* A SAP announce address. For each of these, we run the
64 * control flow algorithm */
68 struct sockaddr_storage orig;
70 int i_rfd; /* Read socket */
71 int i_wfd; /* Write socket */
73 /* Used for flow control */
82 /* A SAP session descriptor, enqueued in the SAP handler queue */
83 struct sap_session_t {
86 sap_address_t *p_address;
87 session_descriptor_t *p_sd;
89 /* Last and next send */
94 /*****************************************************************************
96 *****************************************************************************/
97 static void * RunThread( vlc_object_t *p_this);
98 static int ComputeRate( sap_address_t *p_address );
100 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
101 sap_session_t *p_session );
104 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
105 session_descriptor_t *p_session );
107 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
108 session_descriptor_t *p_session );
110 static void announce_SAPHandlerDestructor( vlc_object_t *p_this );
114 * Create the SAP handler
116 * \param p_announce the parent announce_handler
117 * \return the newly created SAP handler or NULL on error
119 sap_handler_t *announce_SAPHandlerCreate( announce_handler_t *p_announce )
121 sap_handler_t *p_sap;
123 p_sap = vlc_custom_create( VLC_OBJECT(p_announce), sizeof( sap_handler_t ),
124 VLC_OBJECT_ANNOUNCE, "announce" );
128 p_sap->psz_object_name = strdup( "sap announcer" );
130 p_sap->pf_add = announce_SAPAnnounceAdd;
131 p_sap->pf_del = announce_SAPAnnounceDel;
133 p_sap->i_sessions = 0;
134 p_sap->i_addresses = 0;
135 p_sap->i_current_session = 0;
137 p_sap->b_control = config_GetInt( p_sap, "sap-flow-control");
139 if( vlc_thread_create( p_sap, "sap handler", RunThread,
140 VLC_THREAD_PRIORITY_LOW, false ) )
142 msg_Dbg( p_announce, "unable to spawn SAP handler thread");
143 vlc_object_release( p_sap );
147 vlc_object_set_destructor( p_sap, announce_SAPHandlerDestructor );
149 msg_Dbg( p_announce, "thread created, %i sessions", p_sap->i_sessions);
154 static void announce_SAPHandlerDestructor( vlc_object_t * p_this )
156 sap_handler_t *p_sap = (sap_handler_t *)p_this;
159 /* Free the remaining sessions */
160 for( i = 0 ; i< p_sap->i_sessions ; i++)
162 sap_session_t *p_session = p_sap->pp_sessions[i];
163 FREENULL( p_session->psz_data );
164 REMOVE_ELEM( p_sap->pp_sessions, p_sap->i_sessions , i );
165 FREENULL( p_session );
168 /* Free the remaining addresses */
169 for( i = 0 ; i< p_sap->i_addresses ; i++)
171 sap_address_t *p_address = p_sap->pp_addresses[i];
172 FREENULL( p_address->psz_address );
173 if( p_address->i_rfd > -1 )
175 net_Close( p_address->i_rfd );
177 if( p_address->i_wfd > -1 && p_sap->b_control )
179 net_Close( p_address->i_wfd );
181 REMOVE_ELEM( p_sap->pp_addresses, p_sap->i_addresses, i );
182 FREENULL( p_address );
187 * main SAP handler thread
188 * \param p_this the SAP Handler object
191 static void * RunThread( vlc_object_t *p_this)
193 sap_handler_t *p_sap = (sap_handler_t*)p_this;
194 sap_session_t *p_session;
195 int canc = vlc_savecancel ();
196 /* TODO: Once net_Write() is cancel-safe, so will this whole thread.
197 * However, there is a more serious issues here: msleep(SAP_IDLE).
198 * This thread should really use poll().
201 while( !p_sap->b_die )
207 /* If needed, get the rate info */
208 if( p_sap->b_control == true )
210 for( i = 0 ; i< p_sap->i_addresses ; i++)
212 if( p_sap->pp_addresses[i]->b_enabled == true )
214 ComputeRate( p_sap->pp_addresses[i] );
219 /* Find the session to announce */
220 vlc_object_lock( p_sap );
221 if( p_sap->i_sessions > p_sap->i_current_session + 1)
223 p_sap->i_current_session++;
225 else if( p_sap->i_sessions > 0)
227 p_sap->i_current_session = 0;
231 vlc_object_unlock( p_sap );
234 p_session = p_sap->pp_sessions[p_sap->i_current_session];
236 /* And announce it */
237 if( p_session->p_address->b_enabled == true &&
238 p_session->p_address->b_ready == true )
240 announce_SendSAPAnnounce( p_sap, p_session );
242 vlc_object_unlock( p_sap );
244 vlc_restorecancel (canc);
248 /* Add a SAP announce */
249 static int announce_SAPAnnounceAdd( sap_handler_t *p_sap,
250 session_descriptor_t *p_session )
253 char psz_addr[NI_MAXNUMERICHOST];
254 bool b_ipv6 = false, b_ssm = false;
255 sap_session_t *p_sap_session;
257 struct sockaddr_storage addr;
260 vlc_object_lock( p_sap );
261 addrlen = p_session->addrlen;
262 if ((addrlen == 0) || (addrlen > sizeof (addr)))
264 vlc_object_unlock( p_sap );
265 msg_Err( p_sap, "No/invalid address specified for SAP announce" );
269 /* Determine SAP multicast address automatically */
270 memcpy (&addr, &p_session->addr, addrlen);
272 switch( p_session->addr.ss_family )
274 #if defined (HAVE_INET_PTON) || defined (WIN32)
277 /* See RFC3513 for list of valid IPv6 scopes */
278 struct in6_addr *a6 = &((struct sockaddr_in6 *)&addr)->sin6_addr;
280 memcpy( a6->s6_addr + 2, "\x00\x00\x00\x00\x00\x00"
281 "\x00\x00\x00\x00\x00\x02\x7f\xfe", 14 );
282 if( IN6_IS_ADDR_MULTICAST( a6 ) )
284 /* SSM <=> ff3x::/32 */
285 b_ssm = (U32_AT (a6->s6_addr) & 0xfff0ffff) == 0xff300000;
287 /* force flags to zero, preserve scope */
288 a6->s6_addr[1] &= 0xf;
291 /* Unicast IPv6 - assume global scope */
292 memcpy( a6->s6_addr, "\xff\x0e", 2 );
301 /* See RFC2365 for IPv4 scopes */
304 ipv4 = ntohl( ((struct sockaddr_in *)&addr)->sin_addr.s_addr );
305 /* 224.0.0.0/24 => 224.0.0.255 */
306 if ((ipv4 & 0xffffff00) == 0xe0000000)
309 /* 239.255.0.0/16 => 239.255.255.255 */
310 if ((ipv4 & 0xffff0000) == 0xefff0000)
313 /* 239.192.0.0/14 => 239.195.255.255 */
314 if ((ipv4 & 0xfffc0000) == 0xefc00000)
317 if ((ipv4 & 0xff000000) == 0xef000000)
320 /* other addresses => 224.2.127.254 */
322 /* SSM: 232.0.0.0/8 */
323 b_ssm = (ipv4 >> 24) == 232;
329 msg_Err( p_sap, "Out-of-scope multicast address "
330 "not supported by SAP" );
331 vlc_object_unlock( p_sap );
335 ((struct sockaddr_in *)&addr)->sin_addr.s_addr = htonl( ipv4 );
340 vlc_object_unlock( p_sap );
341 msg_Err( p_sap, "Address family %d not supported by SAP",
346 i = vlc_getnameinfo( (struct sockaddr *)&addr, addrlen,
347 psz_addr, sizeof( psz_addr ), NULL, NI_NUMERICHOST );
351 vlc_object_unlock( p_sap );
352 msg_Err( p_sap, "%s", vlc_gai_strerror( i ) );
356 msg_Dbg( p_sap, "using SAP address: %s", psz_addr);
358 /* XXX: Check for dupes */
359 p_sap_session = (sap_session_t*)malloc(sizeof(sap_session_t));
360 p_sap_session->p_sd = p_session;
361 p_sap_session->p_address = NULL;
363 /* Add the address to the buffer */
364 for( i = 0; i < p_sap->i_addresses; i++)
366 if( !strcmp( psz_addr, p_sap->pp_addresses[i]->psz_address ) )
368 p_sap_session->p_address = p_sap->pp_addresses[i];
373 if( p_sap_session->p_address == NULL )
375 sap_address_t *p_address = (sap_address_t *)
376 malloc( sizeof(sap_address_t) );
379 vlc_object_unlock( p_sap );
382 p_address->psz_address = strdup( psz_addr );
383 p_address->i_wfd = net_ConnectUDP( VLC_OBJECT(p_sap), psz_addr, SAP_PORT, 255 );
384 if( p_address->i_wfd != -1 )
386 shutdown( p_address->i_wfd, SHUT_RD );
387 p_address->origlen = sizeof (p_address->orig);
388 getsockname (p_address->i_wfd, (struct sockaddr *)&p_address->orig,
389 &p_address->origlen);
392 if( p_sap->b_control == true )
394 p_address->i_rfd = net_ListenUDP1( (vlc_object_t*)p_sap, psz_addr, SAP_PORT );
395 if( p_address->i_rfd != -1 )
396 shutdown( p_address->i_rfd, SHUT_WR );
397 p_address->i_buff = 0;
398 p_address->b_enabled = true;
399 p_address->b_ready = false;
400 p_address->i_limit = 10000; /* 10000 bps */
405 p_address->b_enabled = true;
406 p_address->b_ready = true;
407 p_address->i_interval = config_GetInt( p_sap,"sap-interval");
408 p_address->i_rfd = -1;
411 if( p_address->i_wfd == -1 || (p_address->i_rfd == -1
412 && p_sap->b_control ) )
414 msg_Warn( p_sap, "disabling address" );
415 p_address->b_enabled = false;
418 INSERT_ELEM( p_sap->pp_addresses,
422 p_sap_session->p_address = p_address;
425 memcpy (&p_session->orig, &p_sap_session->p_address->orig,
426 p_session->origlen = p_sap_session->p_address->origlen);
428 size_t headsize = 20;
429 switch (p_session->orig.ss_family)
440 msg_Err( p_sap, "Address family %d not supported by SAP",
442 vlc_object_unlock( p_sap );
446 /* If needed, build the SDP */
447 assert( p_session->psz_sdp != NULL );
449 p_sap_session->i_last = 0;
450 p_sap_session->i_length = headsize + strlen (p_session->psz_sdp);
451 p_sap_session->psz_data = malloc (p_sap_session->i_length + 1);
452 if (p_sap_session->psz_data == NULL)
454 free (p_session->psz_sdp);
455 vlc_object_unlock( p_sap );
459 /* Build the SAP Headers */
460 uint8_t *psz_head = p_sap_session->psz_data;
462 /* SAPv1, not encrypted, not compressed */
464 psz_head[1] = 0x00; /* No authentification length */
467 psz_head[2] = i_hash >> 8; /* Msg id hash */
468 psz_head[3] = i_hash; /* Msg id hash 2 */
471 switch (p_session->orig.ss_family)
476 struct in6_addr *a6 =
477 &((struct sockaddr_in6 *)&p_session->orig)->sin6_addr;
478 memcpy (psz_head + headsize, a6, 16);
479 psz_head[0] |= 0x10; /* IPv6 flag */
487 (((struct sockaddr_in *)&p_session->orig)->sin_addr.s_addr);
488 memcpy (psz_head + headsize, &ipv4, 4);
495 memcpy (psz_head + headsize, "application/sdp", 16);
498 /* Build the final message */
499 strcpy( (char *)psz_head + headsize, p_session->psz_sdp);
501 /* Enqueue the announce */
502 INSERT_ELEM( p_sap->pp_sessions,
506 msg_Dbg( p_sap,"%i addresses, %i sessions",
507 p_sap->i_addresses,p_sap->i_sessions);
509 vlc_object_unlock( p_sap );
514 /* Remove a SAP Announce */
515 static int announce_SAPAnnounceDel( sap_handler_t *p_sap,
516 session_descriptor_t *p_session )
519 vlc_object_lock( p_sap );
521 msg_Dbg( p_sap, "removing session %p from SAP", p_session);
523 /* Dequeue the announce */
524 for( i = 0; i< p_sap->i_sessions; i++)
526 if( p_session == p_sap->pp_sessions[i]->p_sd )
528 free( p_session->psz_sdp );
529 sap_session_t *p_mysession = p_sap->pp_sessions[i];
530 REMOVE_ELEM( p_sap->pp_sessions,
534 free( p_mysession->psz_data );
540 /* XXX: Dequeue the address too if it is not used anymore
541 * TODO: - address refcount
542 - send a SAP deletion packet */
544 msg_Dbg( p_sap,"%i announcements remaining", p_sap->i_sessions );
546 vlc_object_unlock( p_sap );
551 static int announce_SendSAPAnnounce( sap_handler_t *p_sap,
552 sap_session_t *p_session )
556 /* This announce has never been sent yet */
557 if( p_session->i_last == 0 )
559 p_session->i_next = mdate()+ p_session->p_address->i_interval*1000000;
560 p_session->i_last = 1;
564 if( p_session->i_next < mdate() )
567 msg_Dbg( p_sap, "sending announce");
569 i_ret = net_Write( p_sap, p_session->p_address->i_wfd, NULL,
571 p_session->i_length );
572 if( i_ret != (int)p_session->i_length )
574 msg_Warn( p_sap, "SAP send failed on address %s (%i %i)",
575 p_session->p_address->psz_address,
576 i_ret, p_session->i_length );
578 p_session->i_last = p_session->i_next;
579 p_session->i_next = p_session->i_last
580 + p_session->p_address->i_interval*1000000;
585 static int ComputeRate( sap_address_t *p_address )
587 uint8_t buffer[SAP_MAX_BUFFER];
592 if( p_address->t1 == 0 )
594 p_address->t1 = mdate();
599 /* Might be too slow if we have huge data */
600 ssize_t i_read = recv( p_address->i_rfd, buffer, SAP_MAX_BUFFER, 0 );
608 /* We calculate the rate every 5 seconds */
609 if( i_temp - p_address->t1 < 5000000 )
611 p_address->i_buff += i_tot;
616 i_rate = (int)(8*1000000*((mtime_t)p_address->i_buff + (mtime_t)i_tot ) /
617 (i_temp - p_address->t1 ));
619 p_address->i_limit = 10000;
621 p_address->i_interval = ((1000*i_rate / p_address->i_limit) *
622 (MAX_INTERVAL - MIN_INTERVAL))/1000 + MIN_INTERVAL;
624 if( p_address->i_interval > MAX_INTERVAL || p_address->i_interval < 0 )
626 p_address->i_interval = MAX_INTERVAL;
629 msg_Dbg( p_sap,"%s:%i: rate=%i, interval = %i s",
630 p_address->psz_address,SAP_PORT, i_rate, p_address->i_interval );
633 p_address->b_ready = true;
635 p_address->t1 = i_temp;
636 p_address->i_buff = 0;