2 * Asterisk -- An open source telephony toolkit.
4 * Copyright (C) 1999 - 2006, Digium, Inc.
6 * Mark Spencer <markster@digium.com>
8 * See http://www.asterisk.org for more information about
9 * the Asterisk project. Please do not directly contact
10 * any of the maintainers of this project for assistance;
11 * the project provides a web site, mailing lists and IRC
12 * channels for your use.
14 * This program is free software, distributed under the terms of
15 * the GNU General Public License Version 2. See the LICENSE file
16 * at the top of the source tree.
21 * \brief Implementation of Session Initiation Protocol
23 * \author Mark Spencer <markster@digium.com>
26 * \arg \ref AstCREDITS
28 * Implementation of RFC 3261 - without S/MIME, TCP and TLS support
29 * Configuration file \link Config_sip sip.conf \endlink
34 * \todo Better support of forking
35 * \todo VIA branch tag transaction checking
36 * \todo Transaction support
38 * \ingroup channel_drivers
40 * \par Overview of the handling of SIP sessions
41 * The SIP channel handles several types of SIP sessions, or dialogs,
42 * not all of them being "telephone calls".
43 * - Incoming calls that will be sent to the PBX core
44 * - Outgoing calls, generated by the PBX
45 * - SIP subscriptions and notifications of states and voicemail messages
46 * - SIP registrations, both inbound and outbound
47 * - SIP peer management (peerpoke, OPTIONS)
50 * In the SIP channel, there's a list of active SIP dialogs, which includes
51 * all of these when they are active. "sip show channels" in the CLI will
52 * show most of these, excluding subscriptions which are shown by
53 * "sip show subscriptions"
55 * \par incoming packets
56 * Incoming packets are received in the monitoring thread, then handled by
57 * sipsock_read(). This function parses the packet and matches an existing
58 * dialog or starts a new SIP dialog.
60 * sipsock_read sends the packet to handle_request(), that parses a bit more.
61 * if it's a response to an outbound request, it's sent to handle_response().
62 * If it is a request, handle_request sends it to one of a list of functions
63 * depending on the request type - INVITE, OPTIONS, REFER, BYE, CANCEL etc
64 * sipsock_read locks the ast_channel if it exists (an active call) and
65 * unlocks it after we have processed the SIP message.
67 * A new INVITE is sent to handle_request_invite(), that will end up
68 * starting a new channel in the PBX, the new channel after that executing
69 * in a separate channel thread. This is an incoming "call".
70 * When the call is answered, either by a bridged channel or the PBX itself
71 * the sip_answer() function is called.
73 * The actual media - Video or Audio - is mostly handled by the RTP subsystem
77 * Outbound calls are set up by the PBX through the sip_request_call()
78 * function. After that, they are activated by sip_call().
81 * The PBX issues a hangup on both incoming and outgoing calls through
82 * the sip_hangup() function
88 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
94 #include <sys/socket.h>
95 #include <sys/ioctl.h>
102 #include <sys/signal.h>
103 #include <netinet/in.h>
104 #include <netinet/in_systm.h>
105 #include <arpa/inet.h>
106 #include <netinet/ip.h>
109 #include "asterisk/lock.h"
110 #include "asterisk/channel.h"
111 #include "asterisk/config.h"
112 #include "asterisk/logger.h"
113 #include "asterisk/module.h"
114 #include "asterisk/pbx.h"
115 #include "asterisk/options.h"
116 #include "asterisk/lock.h"
117 #include "asterisk/sched.h"
118 #include "asterisk/io.h"
119 #include "asterisk/rtp.h"
120 #include "asterisk/udptl.h"
121 #include "asterisk/acl.h"
122 #include "asterisk/manager.h"
123 #include "asterisk/callerid.h"
124 #include "asterisk/cli.h"
125 #include "asterisk/app.h"
126 #include "asterisk/musiconhold.h"
127 #include "asterisk/dsp.h"
128 #include "asterisk/features.h"
129 #include "asterisk/acl.h"
130 #include "asterisk/srv.h"
131 #include "asterisk/astdb.h"
132 #include "asterisk/causes.h"
133 #include "asterisk/utils.h"
134 #include "asterisk/file.h"
135 #include "asterisk/astobj.h"
136 #include "asterisk/dnsmgr.h"
137 #include "asterisk/devicestate.h"
138 #include "asterisk/linkedlists.h"
139 #include "asterisk/stringfields.h"
140 #include "asterisk/monitor.h"
141 #include "asterisk/localtime.h"
142 #include "asterisk/abstract_jb.h"
143 #include "asterisk/compiler.h"
153 #define VIDEO_CODEC_MASK 0x1fc0000 /*!< Video codecs from H.261 thru AST_FORMAT_MAX_VIDEO */
154 #ifndef IPTOS_MINCOST
155 #define IPTOS_MINCOST 0x02
158 /* #define VOCAL_DATA_HACK */
160 #define DEFAULT_DEFAULT_EXPIRY 120
161 #define DEFAULT_MIN_EXPIRY 60
162 #define DEFAULT_MAX_EXPIRY 3600
163 #define DEFAULT_REGISTRATION_TIMEOUT 20
164 #define DEFAULT_MAX_FORWARDS "70"
166 /* guard limit must be larger than guard secs */
167 /* guard min must be < 1000, and should be >= 250 */
168 #define EXPIRY_GUARD_SECS 15 /*!< How long before expiry do we reregister */
169 #define EXPIRY_GUARD_LIMIT 30 /*!< Below here, we use EXPIRY_GUARD_PCT instead of
171 #define EXPIRY_GUARD_MIN 500 /*!< This is the minimum guard time applied. If
172 GUARD_PCT turns out to be lower than this, it
173 will use this time instead.
174 This is in milliseconds. */
175 #define EXPIRY_GUARD_PCT 0.20 /*!< Percentage of expires timeout to use when
176 below EXPIRY_GUARD_LIMIT */
177 #define DEFAULT_EXPIRY 900 /*!< Expire slowly */
179 static int min_expiry = DEFAULT_MIN_EXPIRY; /*!< Minimum accepted registration time */
180 static int max_expiry = DEFAULT_MAX_EXPIRY; /*!< Maximum accepted registration time */
181 static int default_expiry = DEFAULT_DEFAULT_EXPIRY;
182 static int expiry = DEFAULT_EXPIRY;
185 #define MAX(a,b) ((a) > (b) ? (a) : (b))
188 #define CALLERID_UNKNOWN "Unknown"
190 #define DEFAULT_MAXMS 2000 /*!< Qualification: Must be faster than 2 seconds by default */
191 #define DEFAULT_FREQ_OK 60 * 1000 /*!< Qualification: How often to check for the host to be up */
192 #define DEFAULT_FREQ_NOTOK 10 * 1000 /*!< Qualification: How often to check, if the host is down... */
194 #define DEFAULT_RETRANS 1000 /*!< How frequently to retransmit Default: 2 * 500 ms in RFC 3261 */
195 #define MAX_RETRANS 6 /*!< Try only 6 times for retransmissions, a total of 7 transmissions */
196 #define SIP_TRANS_TIMEOUT 32000 /*!< SIP request timeout (rfc 3261) 64*T1
197 \todo Use known T1 for timeout (peerpoke)
199 #define DEFAULT_TRANS_TIMEOUT -1 /* Use default SIP transaction timeout */
200 #define MAX_AUTHTRIES 3 /*!< Try authentication three times, then fail */
202 #define SIP_MAX_HEADERS 64 /*!< Max amount of SIP headers to read */
203 #define SIP_MAX_LINES 64 /*!< Max amount of lines in SIP attachment (like SDP) */
204 #define SIP_MAX_PACKET 4096 /*!< Also from RFC 3261 (2543), should sub headers tho */
206 #define INITIAL_CSEQ 101 /*!< our initial sip sequence number */
208 /*! \brief Global jitterbuffer configuration - by default, jb is disabled */
209 static struct ast_jb_conf default_jbconf =
213 .resync_threshold = -1,
216 static struct ast_jb_conf global_jbconf;
218 static const char config[] = "sip.conf";
219 static const char notify_config[] = "sip_notify.conf";
220 static int usecnt = 0;
226 /*! \brief Authorization scheme for call transfers
227 \note Not a bitfield flag, since there are plans for other modes,
228 like "only allow transfers for authenticated devices" */
230 TRANSFER_OPENFORALL, /*!< Allow all SIP transfers */
231 TRANSFER_CLOSED, /*!< Allow no SIP transfers */
240 /* Do _NOT_ make any changes to this enum, or the array following it;
241 if you think you are doing the right thing, you are probably
242 not doing the right thing. If you think there are changes
243 needed, get someone else to review them first _before_
244 submitting a patch. If these two lists do not match properly
245 bad things will happen.
249 XMIT_CRITICAL = 2, /*!< Transmit critical SIP message reliably, with re-transmits.
250 If it fails, it's critical and will cause a teardown of the session */
251 XMIT_RELIABLE = 1, /*!< Transmit SIP message reliably, with re-transmits */
252 XMIT_UNRELIABLE = 0, /*!< Transmit SIP message without bothering with re-transmits */
255 enum parse_register_result {
256 PARSE_REGISTER_FAILED,
257 PARSE_REGISTER_UPDATE,
258 PARSE_REGISTER_QUERY,
261 enum subscriptiontype {
271 static const struct cfsubscription_types {
272 enum subscriptiontype type;
273 const char * const event;
274 const char * const mediatype;
275 const char * const text;
276 } subscription_types[] = {
277 { NONE, "-", "unknown", "unknown" },
278 /* RFC 4235: SIP Dialog event package */
279 { DIALOG_INFO_XML, "dialog", "application/dialog-info+xml", "dialog-info+xml" },
280 { CPIM_PIDF_XML, "presence", "application/cpim-pidf+xml", "cpim-pidf+xml" }, /* RFC 3863 */
281 { PIDF_XML, "presence", "application/pidf+xml", "pidf+xml" }, /* RFC 3863 */
282 { XPIDF_XML, "presence", "application/xpidf+xml", "xpidf+xml" }, /* Pre-RFC 3863 with MS additions */
283 { MWI_NOTIFICATION, "message-summary", "application/simple-message-summary", "mwi" } /* RFC 3842: Mailbox notification */
286 /*! \brief SIP Request methods known by Asterisk */
288 SIP_UNKNOWN, /* Unknown response */
289 SIP_RESPONSE, /* Not request, response to outbound request */
295 SIP_PRACK, /* Not supported at all */
300 SIP_UPDATE, /* We can send UPDATE; but not accept it */
303 SIP_PUBLISH, /* Not supported at all */
306 /*! \brief Authentication types - proxy or www authentication
307 \note Endpoints, like Asterisk, should always use WWW authentication to
308 allow multiple authentications in the same call - to the proxy and
316 /*! \brief Authentication result from check_auth* functions */
317 enum check_auth_result {
319 AUTH_CHALLENGE_SENT = 1,
320 AUTH_SECRET_FAILED = -1,
321 AUTH_USERNAME_MISMATCH = -2,
324 AUTH_UNKNOWN_DOMAIN = -5,
327 /*! \brief States for outbound registrations (with register= lines in sip.conf */
328 enum sipregistrystate {
329 REG_STATE_UNREGISTERED = 0, /*!< We are not registred */
330 REG_STATE_REGSENT, /*!< Registration request sent */
331 REG_STATE_AUTHSENT, /*!< We have tried to authenticate */
332 REG_STATE_REGISTERED, /*!< Registred and done */
333 REG_STATE_REJECTED, /*!< Registration rejected */
334 REG_STATE_TIMEOUT, /*!< Registration timed out */
335 REG_STATE_NOAUTH, /*!< We have no accepted credentials */
336 REG_STATE_FAILED, /*!< Registration failed after several tries */
340 /*! XXX Note that sip_methods[i].id == i must hold or the code breaks */
341 static const struct cfsip_methods {
343 int need_rtp; /*!< when this is the 'primary' use for a pvt structure, does it need RTP? */
346 { SIP_UNKNOWN, RTP, "-UNKNOWN-" },
347 { SIP_RESPONSE, NO_RTP, "SIP/2.0" },
348 { SIP_REGISTER, NO_RTP, "REGISTER" },
349 { SIP_OPTIONS, NO_RTP, "OPTIONS" },
350 { SIP_NOTIFY, NO_RTP, "NOTIFY" },
351 { SIP_INVITE, RTP, "INVITE" },
352 { SIP_ACK, NO_RTP, "ACK" },
353 { SIP_PRACK, NO_RTP, "PRACK" },
354 { SIP_BYE, NO_RTP, "BYE" },
355 { SIP_REFER, NO_RTP, "REFER" },
356 { SIP_SUBSCRIBE, NO_RTP, "SUBSCRIBE" },
357 { SIP_MESSAGE, NO_RTP, "MESSAGE" },
358 { SIP_UPDATE, NO_RTP, "UPDATE" },
359 { SIP_INFO, NO_RTP, "INFO" },
360 { SIP_CANCEL, NO_RTP, "CANCEL" },
361 { SIP_PUBLISH, NO_RTP, "PUBLISH" }
364 /*! Define SIP option tags, used in Require: and Supported: headers
365 We need to be aware of these properties in the phones to use
366 the replace: header. We should not do that without knowing
367 that the other end supports it...
368 This is nothing we can configure, we learn by the dialog
369 Supported: header on the REGISTER (peer) or the INVITE
371 We are not using many of these today, but will in the future.
372 This is documented in RFC 3261
375 #define NOT_SUPPORTED 0
377 #define SIP_OPT_REPLACES (1 << 0)
378 #define SIP_OPT_100REL (1 << 1)
379 #define SIP_OPT_TIMER (1 << 2)
380 #define SIP_OPT_EARLY_SESSION (1 << 3)
381 #define SIP_OPT_JOIN (1 << 4)
382 #define SIP_OPT_PATH (1 << 5)
383 #define SIP_OPT_PREF (1 << 6)
384 #define SIP_OPT_PRECONDITION (1 << 7)
385 #define SIP_OPT_PRIVACY (1 << 8)
386 #define SIP_OPT_SDP_ANAT (1 << 9)
387 #define SIP_OPT_SEC_AGREE (1 << 10)
388 #define SIP_OPT_EVENTLIST (1 << 11)
389 #define SIP_OPT_GRUU (1 << 12)
390 #define SIP_OPT_TARGET_DIALOG (1 << 13)
391 #define SIP_OPT_NOREFERSUB (1 << 14)
392 #define SIP_OPT_HISTINFO (1 << 15)
393 #define SIP_OPT_RESPRIORITY (1 << 16)
395 /*! \brief List of well-known SIP options. If we get this in a require,
396 we should check the list and answer accordingly. */
397 static const struct cfsip_options {
398 int id; /*!< Bitmap ID */
399 int supported; /*!< Supported by Asterisk ? */
400 char * const text; /*!< Text id, as in standard */
401 } sip_options[] = { /* XXX used in 3 places */
402 /* RFC3891: Replaces: header for transfer */
403 { SIP_OPT_REPLACES, SUPPORTED, "replaces" },
404 /* One version of Polycom firmware has the wrong label */
405 { SIP_OPT_REPLACES, SUPPORTED, "replace" },
406 /* RFC3262: PRACK 100% reliability */
407 { SIP_OPT_100REL, NOT_SUPPORTED, "100rel" },
408 /* RFC4028: SIP Session Timers */
409 { SIP_OPT_TIMER, NOT_SUPPORTED, "timer" },
410 /* RFC3959: SIP Early session support */
411 { SIP_OPT_EARLY_SESSION, NOT_SUPPORTED, "early-session" },
412 /* RFC3911: SIP Join header support */
413 { SIP_OPT_JOIN, NOT_SUPPORTED, "join" },
414 /* RFC3327: Path support */
415 { SIP_OPT_PATH, NOT_SUPPORTED, "path" },
416 /* RFC3840: Callee preferences */
417 { SIP_OPT_PREF, NOT_SUPPORTED, "pref" },
418 /* RFC3312: Precondition support */
419 { SIP_OPT_PRECONDITION, NOT_SUPPORTED, "precondition" },
420 /* RFC3323: Privacy with proxies*/
421 { SIP_OPT_PRIVACY, NOT_SUPPORTED, "privacy" },
422 /* RFC4092: Usage of the SDP ANAT Semantics in the SIP */
423 { SIP_OPT_SDP_ANAT, NOT_SUPPORTED, "sdp-anat" },
424 /* RFC3329: Security agreement mechanism */
425 { SIP_OPT_SEC_AGREE, NOT_SUPPORTED, "sec_agree" },
426 /* SIMPLE events: draft-ietf-simple-event-list-07.txt */
427 { SIP_OPT_EVENTLIST, NOT_SUPPORTED, "eventlist" },
428 /* GRUU: Globally Routable User Agent URI's */
429 { SIP_OPT_GRUU, NOT_SUPPORTED, "gruu" },
430 /* Target-dialog: draft-ietf-sip-target-dialog-03.txt */
431 { SIP_OPT_TARGET_DIALOG,NOT_SUPPORTED, "tdialog" },
432 /* Disable the REFER subscription, RFC 4488 */
433 { SIP_OPT_NOREFERSUB, NOT_SUPPORTED, "norefersub" },
434 /* ietf-sip-history-info-06.txt */
435 { SIP_OPT_HISTINFO, NOT_SUPPORTED, "histinfo" },
436 /* ietf-sip-resource-priority-10.txt */
437 { SIP_OPT_RESPRIORITY, NOT_SUPPORTED, "resource-priority" },
441 /*! \brief SIP Methods we support */
442 #define ALLOWED_METHODS "INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY"
444 /*! \brief SIP Extensions we support */
445 #define SUPPORTED_EXTENSIONS "replaces"
447 /*! \brief Standard SIP port from RFC 3261. DO NOT CHANGE THIS */
448 #define STANDARD_SIP_PORT 5060
449 /* Note: in many SIP headers, absence of a port number implies port 5060,
450 * and this is why we cannot change the above constant.
451 * There is a limited number of places in asterisk where we could,
452 * in principle, use a different "default" port number, but
453 * we do not support this feature at the moment.
456 /* Default values, set and reset in reload_config before reading configuration */
457 /* These are default values in the source. There are other recommended values in the
458 sip.conf.sample for new installations. These may differ to keep backwards compatibility,
459 yet encouraging new behaviour on new installations
461 #define DEFAULT_CONTEXT "default"
462 #define DEFAULT_MOHINTERPRET "default"
463 #define DEFAULT_MOHSUGGEST ""
464 #define DEFAULT_VMEXTEN "asterisk"
465 #define DEFAULT_CALLERID "asterisk"
466 #define DEFAULT_NOTIFYMIME "application/simple-message-summary"
467 #define DEFAULT_MWITIME 10
468 #define DEFAULT_ALLOWGUEST TRUE
469 #define DEFAULT_SRVLOOKUP FALSE /*!< Recommended setting is ON */
470 #define DEFAULT_COMPACTHEADERS FALSE
471 #define DEFAULT_TOS_SIP 0 /*!< Call signalling packets should be marked as DSCP CS3, but the default is 0 to be compatible with previous versions. */
472 #define DEFAULT_TOS_AUDIO 0 /*!< Audio packets should be marked as DSCP EF (Expedited Forwarding), but the default is 0 to be compatible with previous versions. */
473 #define DEFAULT_TOS_VIDEO 0 /*!< Video packets should be marked as DSCP AF41, but the default is 0 to be compatible with previous versions. */
474 #define DEFAULT_ALLOW_EXT_DOM TRUE
475 #define DEFAULT_REALM "asterisk"
476 #define DEFAULT_NOTIFYRINGING TRUE
477 #define DEFAULT_PEDANTIC FALSE
478 #define DEFAULT_AUTOCREATEPEER FALSE
479 #define DEFAULT_QUALIFY FALSE
480 #define DEFAULT_T1MIN 100 /*!< 100 MS for minimal roundtrip time */
481 #define DEFAULT_MAX_CALL_BITRATE (384) /*!< Max bitrate for video */
482 #ifndef DEFAULT_USERAGENT
483 #define DEFAULT_USERAGENT "Asterisk PBX" /*!< Default Useragent: header unless re-defined in sip.conf */
487 /* Default setttings are used as a channel setting and as a default when
488 configuring devices */
489 static char default_context[AST_MAX_CONTEXT];
490 static char default_subscribecontext[AST_MAX_CONTEXT];
491 static char default_language[MAX_LANGUAGE];
492 static char default_callerid[AST_MAX_EXTENSION];
493 static char default_fromdomain[AST_MAX_EXTENSION];
494 static char default_notifymime[AST_MAX_EXTENSION];
495 static int default_qualify; /*!< Default Qualify= setting */
496 static char default_vmexten[AST_MAX_EXTENSION];
497 static char default_mohinterpret[MAX_MUSICCLASS]; /*!< Global setting for moh class to use when put on hold */
498 static char default_mohsuggest[MAX_MUSICCLASS]; /*!< Global setting for moh class to suggest when putting
499 * a bridged channel on hold */
500 static int default_maxcallbitrate; /*!< Maximum bitrate for call */
501 static struct ast_codec_pref default_prefs; /*!< Default codec prefs */
503 /* Global settings only apply to the channel */
504 static int global_rtautoclear;
505 static int global_notifyringing; /*!< Send notifications on ringing */
506 static int global_alwaysauthreject; /*!< Send 401 Unauthorized for all failing requests */
507 static int srvlookup; /*!< SRV Lookup on or off. Default is off, RFC behavior is on */
508 static int pedanticsipchecking; /*!< Extra checking ? Default off */
509 static int autocreatepeer; /*!< Auto creation of peers at registration? Default off. */
510 static int global_relaxdtmf; /*!< Relax DTMF */
511 static int global_rtptimeout; /*!< Time out call if no RTP */
512 static int global_rtpholdtimeout;
513 static int global_rtpkeepalive; /*!< Send RTP keepalives */
514 static int global_reg_timeout;
515 static int global_regattempts_max; /*!< Registration attempts before giving up */
516 static int global_allowguest; /*!< allow unauthenticated users/peers to connect? */
517 static int global_allowsubscribe; /*!< Flag for disabling ALL subscriptions, this is FALSE only if all peers are FALSE
518 the global setting is in globals_flags[1] */
519 static int global_mwitime; /*!< Time between MWI checks for peers */
520 static unsigned int global_tos_sip; /*!< IP type of service for SIP packets */
521 static unsigned int global_tos_audio; /*!< IP type of service for audio RTP packets */
522 static unsigned int global_tos_video; /*!< IP type of service for video RTP packets */
523 static int compactheaders; /*!< send compact sip headers */
524 static int recordhistory; /*!< Record SIP history. Off by default */
525 static int dumphistory; /*!< Dump history to verbose before destroying SIP dialog */
526 static char global_realm[MAXHOSTNAMELEN]; /*!< Default realm */
527 static char global_regcontext[AST_MAX_CONTEXT]; /*!< Context for auto-extensions */
528 static char global_useragent[AST_MAX_EXTENSION]; /*!< Useragent for the SIP channel */
529 static int allow_external_domains; /*!< Accept calls to external SIP domains? */
530 static int global_callevents; /*!< Whether we send manager events or not */
531 static int global_t1min; /*!< T1 roundtrip time minimum */
532 static int global_autoframing; /*!< ?????????? */
533 static enum transfermodes global_allowtransfer; /*!< SIP Refer restriction scheme */
535 /*! \brief Codecs that we support by default: */
536 static int global_capability = AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_GSM | AST_FORMAT_H263;
537 static int noncodeccapability = AST_RTP_DTMF;
539 static int global_ignoreoodresponses = 1;
541 /* Object counters */
542 static int suserobjs = 0; /*!< Static users */
543 static int ruserobjs = 0; /*!< Realtime users */
544 static int speerobjs = 0; /*!< Statis peers */
545 static int rpeerobjs = 0; /*!< Realtime peers */
546 static int apeerobjs = 0; /*!< Autocreated peer objects */
547 static int regobjs = 0; /*!< Registry objects */
549 static struct ast_flags global_flags[2] = {{0}}; /*!< global SIP_ flags */
552 /*! \brief Protect the SIP dialog list (of sip_pvt's) */
553 AST_MUTEX_DEFINE_STATIC(iflock);
555 /*! \brief Protect the monitoring thread, so only one process can kill or start it, and not
556 when it's doing something critical. */
557 AST_MUTEX_DEFINE_STATIC(netlock);
559 AST_MUTEX_DEFINE_STATIC(monlock);
561 AST_MUTEX_DEFINE_STATIC(sip_reload_lock);
563 /*! \brief This is the thread for the monitor which checks for input on the channels
564 which are not currently in use. */
565 static pthread_t monitor_thread = AST_PTHREADT_NULL;
567 static int sip_reloading = FALSE; /*!< Flag for avoiding multiple reloads at the same time */
568 static enum channelreloadreason sip_reloadreason; /*!< Reason for last reload/load of configuration */
570 static struct sched_context *sched; /*!< The scheduling context */
571 static struct io_context *io; /*!< The IO context */
572 static int *sipsock_read_id; /*!< ID of IO entry for sipsock FD */
574 #define DEC_CALL_LIMIT 0
575 #define INC_CALL_LIMIT 1
576 #define DEC_CALL_RINGING 2
577 #define INC_CALL_RINGING 3
579 /*! \brief sip_request: The data grabbed from the UDP socket */
581 char *rlPart1; /*!< SIP Method Name or "SIP/2.0" protocol version */
582 char *rlPart2; /*!< The Request URI or Response Status */
583 int len; /*!< Length */
584 int headers; /*!< # of SIP Headers */
585 int method; /*!< Method of this request */
586 int lines; /*!< Body Content */
587 unsigned int flags; /*!< SIP_PKT Flags for this packet */
588 char *header[SIP_MAX_HEADERS];
589 char *line[SIP_MAX_LINES];
590 char data[SIP_MAX_PACKET];
591 unsigned int sdp_start; /*!< the line number where the SDP begins */
592 unsigned int sdp_end; /*!< the line number where the SDP ends */
596 * A sip packet is stored into the data[] buffer, with the header followed
597 * by an empty line and the body of the message.
598 * On outgoing packets, data is accumulated in data[] with len reflecting
599 * the next available byte, headers and lines count the number of lines
600 * in both parts. There are no '\0' in data[0..len-1].
602 * On received packet, the input read from the socket is copied into data[],
603 * len is set and the string is NUL-terminated. Then a parser fills up
604 * the other fields -header[] and line[] to point to the lines of the
605 * message, rlPart1 and rlPart2 parse the first lnie as below:
607 * Requests have in the first line METHOD URI SIP/2.0
608 * rlPart1 = method; rlPart2 = uri;
609 * Responses have in the first line SIP/2.0 code description
610 * rlPart1 = SIP/2.0; rlPart2 = code + description;
614 /*! \brief structure used in transfers */
616 struct ast_channel *chan1; /*!< First channel involved */
617 struct ast_channel *chan2; /*!< Second channel involved */
618 struct sip_request req; /*!< Request that caused the transfer (REFER) */
619 int seqno; /*!< Sequence number */
624 /*! \brief Parameters to the transmit_invite function */
625 struct sip_invite_param {
626 int addsipheaders; /*!< Add extra SIP headers */
627 const char *uri_options; /*!< URI options to add to the URI */
628 const char *vxml_url; /*!< VXML url for Cisco phones */
629 char *auth; /*!< Authentication */
630 char *authheader; /*!< Auth header */
631 enum sip_auth_type auth_type; /*!< Authentication type */
632 const char *replaces; /*!< Replaces header for call transfers */
633 int transfer; /*!< Flag - is this Invite part of a SIP transfer? (invite/replaces) */
636 /*! \brief Structure to save routing information for a SIP session */
638 struct sip_route *next;
642 /*! \brief Modes for SIP domain handling in the PBX */
644 SIP_DOMAIN_AUTO, /*!< This domain is auto-configured */
645 SIP_DOMAIN_CONFIG, /*!< This domain is from configuration */
648 /*! \brief Domain data structure.
649 \note In the future, we will connect this to a configuration tree specific
653 char domain[MAXHOSTNAMELEN]; /*!< SIP domain we are responsible for */
654 char context[AST_MAX_EXTENSION]; /*!< Incoming context for this domain */
655 enum domain_mode mode; /*!< How did we find this domain? */
656 AST_LIST_ENTRY(domain) list; /*!< List mechanics */
659 static AST_LIST_HEAD_STATIC(domain_list, domain); /*!< The SIP domain list */
662 /*! \brief sip_history: Structure for saving transactions within a SIP dialog */
664 AST_LIST_ENTRY(sip_history) list;
665 char event[0]; /* actually more, depending on needs */
668 AST_LIST_HEAD_NOLOCK(sip_history_head, sip_history); /*!< history list, entry in sip_pvt */
670 /*! \brief sip_auth: Creadentials for authentication to other SIP services */
672 char realm[AST_MAX_EXTENSION]; /*!< Realm in which these credentials are valid */
673 char username[256]; /*!< Username */
674 char secret[256]; /*!< Secret */
675 char md5secret[256]; /*!< MD5Secret */
676 struct sip_auth *next; /*!< Next auth structure in list */
679 /*--- Various flags for the flags field in the pvt structure */
680 #define SIP_ALREADYGONE (1 << 0) /*!< Whether or not we've already been destroyed by our peer */
681 #define SIP_NEEDDESTROY (1 << 1) /*!< if we need to be destroyed by the monitor thread */
682 #define SIP_NOVIDEO (1 << 2) /*!< Didn't get video in invite, don't offer */
683 #define SIP_RINGING (1 << 3) /*!< Have sent 180 ringing */
684 #define SIP_PROGRESS_SENT (1 << 4) /*!< Have sent 183 message progress */
685 #define SIP_NEEDREINVITE (1 << 5) /*!< Do we need to send another reinvite? */
686 #define SIP_PENDINGBYE (1 << 6) /*!< Need to send bye after we ack? */
687 #define SIP_GOTREFER (1 << 7) /*!< Got a refer? */
688 #define SIP_PROMISCREDIR (1 << 8) /*!< Promiscuous redirection */
689 #define SIP_TRUSTRPID (1 << 9) /*!< Trust RPID headers? */
690 #define SIP_USEREQPHONE (1 << 10) /*!< Add user=phone to numeric URI. Default off */
691 #define SIP_REALTIME (1 << 11) /*!< Flag for realtime users */
692 #define SIP_USECLIENTCODE (1 << 12) /*!< Trust X-ClientCode info message */
693 #define SIP_OUTGOING (1 << 13) /*!< Is this an outgoing call? */
694 #define SIP_CAN_BYE (1 << 14) /*!< Can we send BYE on this dialog? */
695 #define SIP_DEFER_BYE_ON_TRANSFER (1 << 15) /*!< Do not hangup at first ast_hangup */
696 #define SIP_DTMF (3 << 16) /*!< DTMF Support: four settings, uses two bits */
697 #define SIP_DTMF_RFC2833 (0 << 16) /*!< DTMF Support: RTP DTMF - "rfc2833" */
698 #define SIP_DTMF_INBAND (1 << 16) /*!< DTMF Support: Inband audio, only for ULAW/ALAW - "inband" */
699 #define SIP_DTMF_INFO (2 << 16) /*!< DTMF Support: SIP Info messages - "info" */
700 #define SIP_DTMF_AUTO (3 << 16) /*!< DTMF Support: AUTO switch between rfc2833 and in-band DTMF */
702 #define SIP_NAT (3 << 18) /*!< four settings, uses two bits */
703 #define SIP_NAT_NEVER (0 << 18) /*!< No nat support */
704 #define SIP_NAT_RFC3581 (1 << 18) /*!< NAT RFC3581 */
705 #define SIP_NAT_ROUTE (2 << 18) /*!< NAT Only ROUTE */
706 #define SIP_NAT_ALWAYS (3 << 18) /*!< NAT Both ROUTE and RFC3581 */
707 /* re-INVITE related settings */
708 #define SIP_REINVITE (7 << 20) /*!< three bits used */
709 #define SIP_CAN_REINVITE (1 << 20) /*!< allow peers to be reinvited to send media directly p2p */
710 #define SIP_CAN_REINVITE_NAT (2 << 20) /*!< allow media reinvite when new peer is behind NAT */
711 #define SIP_REINVITE_UPDATE (4 << 20) /*!< use UPDATE (RFC3311) when reinviting this peer */
712 /* "insecure" settings */
713 #define SIP_INSECURE_PORT (1 << 23) /*!< don't require matching port for incoming requests */
714 #define SIP_INSECURE_INVITE (1 << 24) /*!< don't require authentication for incoming INVITEs */
715 /* Sending PROGRESS in-band settings */
716 #define SIP_PROG_INBAND (3 << 25) /*!< three settings, uses two bits */
717 #define SIP_PROG_INBAND_NEVER (0 << 25)
718 #define SIP_PROG_INBAND_NO (1 << 25)
719 #define SIP_PROG_INBAND_YES (2 << 25)
720 #define SIP_FREE_BIT (1 << 27) /*!< Undefined bit - not in use */
721 #define SIP_CALL_LIMIT (1 << 28) /*!< Call limit enforced for this call */
722 #define SIP_SENDRPID (1 << 29) /*!< Remote Party-ID Support */
723 #define SIP_INC_COUNT (1 << 30) /*!< Did this connection increment the counter of in-use calls? */
724 #define SIP_G726_NONSTANDARD (1 << 31) /*!< Use non-standard packing for G726-32 data */
726 #define SIP_FLAGS_TO_COPY \
727 (SIP_PROMISCREDIR | SIP_TRUSTRPID | SIP_SENDRPID | SIP_DTMF | SIP_REINVITE | \
728 SIP_PROG_INBAND | SIP_USECLIENTCODE | SIP_NAT | SIP_G726_NONSTANDARD | \
729 SIP_USEREQPHONE | SIP_INSECURE_PORT | SIP_INSECURE_INVITE)
731 /*--- a new page of flags (for flags[1] */
733 #define SIP_PAGE2_RTCACHEFRIENDS (1 << 0)
734 #define SIP_PAGE2_RTUPDATE (1 << 1)
735 #define SIP_PAGE2_RTAUTOCLEAR (1 << 2)
736 #define SIP_PAGE2_RT_FROMCONTACT (1 << 4)
737 #define SIP_PAGE2_RTSAVE_SYSNAME (1 << 5)
738 /* Space for addition of other realtime flags in the future */
739 #define SIP_PAGE2_IGNOREREGEXPIRE (1 << 10)
740 #define SIP_PAGE2_DEBUG (3 << 11)
741 #define SIP_PAGE2_DEBUG_CONFIG (1 << 11)
742 #define SIP_PAGE2_DEBUG_CONSOLE (1 << 12)
743 #define SIP_PAGE2_DYNAMIC (1 << 13) /*!< Dynamic Peers register with Asterisk */
744 #define SIP_PAGE2_SELFDESTRUCT (1 << 14) /*!< Automatic peers need to destruct themselves */
745 #define SIP_PAGE2_VIDEOSUPPORT (1 << 15)
746 #define SIP_PAGE2_ALLOWSUBSCRIBE (1 << 16) /*!< Allow subscriptions from this peer? */
747 #define SIP_PAGE2_ALLOWOVERLAP (1 << 17) /*!< Allow overlap dialing ? */
748 #define SIP_PAGE2_SUBSCRIBEMWIONLY (1 << 18) /*!< Only issue MWI notification if subscribed to */
749 #define SIP_PAGE2_INC_RINGING (1 << 19) /*!< Did this connection increment the counter of in-use calls? */
750 #define SIP_PAGE2_T38SUPPORT (7 << 20) /*!< T38 Fax Passthrough Support */
751 #define SIP_PAGE2_T38SUPPORT_UDPTL (1 << 20) /*!< 20: T38 Fax Passthrough Support */
752 #define SIP_PAGE2_T38SUPPORT_RTP (2 << 20) /*!< 21: T38 Fax Passthrough Support */
753 #define SIP_PAGE2_T38SUPPORT_TCP (4 << 20) /*!< 22: T38 Fax Passthrough Support */
754 #define SIP_PAGE2_CALL_ONHOLD (3 << 23) /*!< Call states */
755 #define SIP_PAGE2_CALL_ONHOLD_ONEDIR (1 << 23) /*!< 23: One directional hold */
756 #define SIP_PAGE2_CALL_ONHOLD_INACTIVE (2 << 24) /*!< 24: Inactive */
757 #define SIP_PAGE2_RFC2833_COMPENSATE (1 << 26)
759 #define SIP_PAGE2_FLAGS_TO_COPY \
760 (SIP_PAGE2_ALLOWSUBSCRIBE | SIP_PAGE2_ALLOWOVERLAP | SIP_PAGE2_VIDEOSUPPORT | SIP_PAGE2_T38SUPPORT | SIP_PAGE2_RFC2833_COMPENSATE)
762 /* SIP packet flags */
763 #define SIP_PKT_DEBUG (1 << 0) /*!< Debug this packet */
764 #define SIP_PKT_WITH_TOTAG (1 << 1) /*!< This packet has a to-tag */
765 #define SIP_PKT_IGNORE (1 << 2) /*!< This is a re-transmit, ignore it */
766 #define SIP_PKT_IGNORE_RESP (1 << 3) /*!< Resp ignore - ??? */
767 #define SIP_PKT_IGNORE_REQ (1 << 4) /*!< Req ignore - ??? */
769 /* T.38 set of flags */
770 #define T38FAX_FILL_BIT_REMOVAL (1 << 0) /*!< Default: 0 (unset)*/
771 #define T38FAX_TRANSCODING_MMR (1 << 1) /*!< Default: 0 (unset)*/
772 #define T38FAX_TRANSCODING_JBIG (1 << 2) /*!< Default: 0 (unset)*/
773 /* Rate management */
774 #define T38FAX_RATE_MANAGEMENT_TRANSFERED_TCF (0 << 3)
775 #define T38FAX_RATE_MANAGEMENT_LOCAL_TCF (1 << 3) /*!< Unset for transferredTCF (UDPTL), set for localTCF (TPKT) */
776 /* UDP Error correction */
777 #define T38FAX_UDP_EC_NONE (0 << 4) /*!< two bits, if unset NO t38UDPEC field in T38 SDP*/
778 #define T38FAX_UDP_EC_FEC (1 << 4) /*!< Set for t38UDPFEC */
779 #define T38FAX_UDP_EC_REDUNDANCY (2 << 4) /*!< Set for t38UDPRedundancy */
780 /* T38 Spec version */
781 #define T38FAX_VERSION (3 << 6) /*!< two bits, 2 values so far, up to 4 values max */
782 #define T38FAX_VERSION_0 (0 << 6) /*!< Version 0 */
783 #define T38FAX_VERSION_1 (1 << 6) /*!< Version 1 */
784 /* Maximum Fax Rate */
785 #define T38FAX_RATE_2400 (1 << 8) /*!< 2400 bps t38FaxRate */
786 #define T38FAX_RATE_4800 (1 << 9) /*!< 4800 bps t38FaxRate */
787 #define T38FAX_RATE_7200 (1 << 10) /*!< 7200 bps t38FaxRate */
788 #define T38FAX_RATE_9600 (1 << 11) /*!< 9600 bps t38FaxRate */
789 #define T38FAX_RATE_12000 (1 << 12) /*!< 12000 bps t38FaxRate */
790 #define T38FAX_RATE_14400 (1 << 13) /*!< 14400 bps t38FaxRate */
792 /*!< This is default: NO MMR and JBIG trancoding, NO fill bit removal, transferredTCF TCF, UDP FEC, Version 0 and 9600 max fax rate */
793 static int global_t38_capability = T38FAX_VERSION_0 | T38FAX_RATE_2400 | T38FAX_RATE_4800 | T38FAX_RATE_7200 | T38FAX_RATE_9600;
795 #define sipdebug ast_test_flag(&global_flags[1], SIP_PAGE2_DEBUG)
796 #define sipdebug_config ast_test_flag(&global_flags[1], SIP_PAGE2_DEBUG_CONFIG)
797 #define sipdebug_console ast_test_flag(&global_flags[1], SIP_PAGE2_DEBUG_CONSOLE)
799 /*! \brief T38 States for a call */
801 T38_DISABLED = 0, /*!< Not enabled */
802 T38_LOCAL_DIRECT, /*!< Offered from local */
803 T38_LOCAL_REINVITE, /*!< Offered from local - REINVITE */
804 T38_PEER_DIRECT, /*!< Offered from peer */
805 T38_PEER_REINVITE, /*!< Offered from peer - REINVITE */
806 T38_ENABLED /*!< Negotiated (enabled) */
809 /*! \brief T.38 channel settings (at some point we need to make this alloc'ed */
810 struct t38properties {
811 struct ast_flags t38support; /*!< Flag for udptl, rtp or tcp support for this session */
812 int capability; /*!< Our T38 capability */
813 int peercapability; /*!< Peers T38 capability */
814 int jointcapability; /*!< Supported T38 capability at both ends */
815 enum t38state state; /*!< T.38 state */
818 /*! \brief Parameters to know status of transfer */
820 REFER_IDLE, /*!< No REFER is in progress */
821 REFER_SENT, /*!< Sent REFER to transferee */
822 REFER_RECEIVED, /*!< Received REFER from transferer */
823 REFER_CONFIRMED, /*!< Refer confirmed with a 100 TRYING */
824 REFER_ACCEPTED, /*!< Accepted by transferee */
825 REFER_RINGING, /*!< Target Ringing */
826 REFER_200OK, /*!< Answered by transfer target */
827 REFER_FAILED, /*!< REFER declined - go on */
828 REFER_NOAUTH /*!< We had no auth for REFER */
831 static const struct c_referstatusstring {
832 enum referstatus status;
834 } referstatusstrings[] = {
835 { REFER_IDLE, "<none>" },
836 { REFER_SENT, "Request sent" },
837 { REFER_RECEIVED, "Request received" },
838 { REFER_ACCEPTED, "Accepted" },
839 { REFER_RINGING, "Target ringing" },
840 { REFER_200OK, "Done" },
841 { REFER_FAILED, "Failed" },
842 { REFER_NOAUTH, "Failed - auth failure" }
845 /*! \brief Structure to handle SIP transfers. Dynamically allocated when needed */
846 /* OEJ: Should be moved to string fields */
848 char refer_to[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO extension */
849 char refer_to_domain[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO domain */
850 char refer_to_urioption[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO uri options */
851 char refer_to_context[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO context */
852 char referred_by[AST_MAX_EXTENSION]; /*!< Place to store REFERRED-BY extension */
853 char referred_by_name[AST_MAX_EXTENSION]; /*!< Place to store REFERRED-BY extension */
854 char refer_contact[AST_MAX_EXTENSION]; /*!< Place to store Contact info from a REFER extension */
855 char replaces_callid[BUFSIZ]; /*!< Replace info: callid */
856 char replaces_callid_totag[BUFSIZ/2]; /*!< Replace info: to-tag */
857 char replaces_callid_fromtag[BUFSIZ/2]; /*!< Replace info: from-tag */
858 struct sip_pvt *refer_call; /*!< Call we are referring */
859 int attendedtransfer; /*!< Attended or blind transfer? */
860 int localtransfer; /*!< Transfer to local domain? */
861 enum referstatus status; /*!< REFER status */
864 /*! \brief sip_pvt: PVT structures are used for each SIP dialog, ie. a call, a registration, a subscribe */
865 static struct sip_pvt {
866 ast_mutex_t lock; /*!< Dialog private lock */
867 int method; /*!< SIP method that opened this dialog */
868 AST_DECLARE_STRING_FIELDS(
869 AST_STRING_FIELD(callid); /*!< Global CallID */
870 AST_STRING_FIELD(randdata); /*!< Random data */
871 AST_STRING_FIELD(accountcode); /*!< Account code */
872 AST_STRING_FIELD(realm); /*!< Authorization realm */
873 AST_STRING_FIELD(nonce); /*!< Authorization nonce */
874 AST_STRING_FIELD(opaque); /*!< Opaque nonsense */
875 AST_STRING_FIELD(qop); /*!< Quality of Protection, since SIP wasn't complicated enough yet. */
876 AST_STRING_FIELD(domain); /*!< Authorization domain */
877 AST_STRING_FIELD(from); /*!< The From: header */
878 AST_STRING_FIELD(useragent); /*!< User agent in SIP request */
879 AST_STRING_FIELD(exten); /*!< Extension where to start */
880 AST_STRING_FIELD(context); /*!< Context for this call */
881 AST_STRING_FIELD(subscribecontext); /*!< Subscribecontext */
882 AST_STRING_FIELD(subscribeuri); /*!< Subscribecontext */
883 AST_STRING_FIELD(fromdomain); /*!< Domain to show in the from field */
884 AST_STRING_FIELD(fromuser); /*!< User to show in the user field */
885 AST_STRING_FIELD(fromname); /*!< Name to show in the user field */
886 AST_STRING_FIELD(tohost); /*!< Host we should put in the "to" field */
887 AST_STRING_FIELD(language); /*!< Default language for this call */
888 AST_STRING_FIELD(mohinterpret); /*!< MOH class to use when put on hold */
889 AST_STRING_FIELD(mohsuggest); /*!< MOH class to suggest when putting a peer on hold */
890 AST_STRING_FIELD(rdnis); /*!< Referring DNIS */
891 AST_STRING_FIELD(theirtag); /*!< Their tag */
892 AST_STRING_FIELD(username); /*!< [user] name */
893 AST_STRING_FIELD(peername); /*!< [peer] name, not set if [user] */
894 AST_STRING_FIELD(authname); /*!< Who we use for authentication */
895 AST_STRING_FIELD(uri); /*!< Original requested URI */
896 AST_STRING_FIELD(okcontacturi); /*!< URI from the 200 OK on INVITE */
897 AST_STRING_FIELD(peersecret); /*!< Password */
898 AST_STRING_FIELD(peermd5secret);
899 AST_STRING_FIELD(cid_num); /*!< Caller*ID number */
900 AST_STRING_FIELD(cid_name); /*!< Caller*ID name */
901 AST_STRING_FIELD(via); /*!< Via: header */
902 AST_STRING_FIELD(fullcontact); /*!< The Contact: that the UA registers with us */
903 AST_STRING_FIELD(our_contact); /*!< Our contact header */
904 AST_STRING_FIELD(rpid); /*!< Our RPID header */
905 AST_STRING_FIELD(rpid_from); /*!< Our RPID From header */
907 unsigned int ocseq; /*!< Current outgoing seqno */
908 unsigned int icseq; /*!< Current incoming seqno */
909 ast_group_t callgroup; /*!< Call group */
910 ast_group_t pickupgroup; /*!< Pickup group */
911 int lastinvite; /*!< Last Cseq of invite */
912 struct ast_flags flags[2]; /*!< SIP_ flags */
913 int timer_t1; /*!< SIP timer T1, ms rtt */
914 unsigned int sipoptions; /*!< Supported SIP options on the other end */
915 struct ast_codec_pref prefs; /*!< codec prefs */
916 int capability; /*!< Special capability (codec) */
917 int jointcapability; /*!< Supported capability at both ends (codecs ) */
918 int peercapability; /*!< Supported peer capability */
919 int prefcodec; /*!< Preferred codec (outbound only) */
920 int noncodeccapability; /*!< DTMF RFC2833 telephony-event */
921 int redircodecs; /*!< Redirect codecs */
922 int maxcallbitrate; /*!< Maximum Call Bitrate for Video Calls */
923 struct t38properties t38; /*!< T38 settings */
924 struct sockaddr_in udptlredirip; /*!< Where our T.38 UDPTL should be going if not to us */
925 struct ast_udptl *udptl; /*!< T.38 UDPTL session */
926 int callingpres; /*!< Calling presentation */
927 int authtries; /*!< Times we've tried to authenticate */
928 int expiry; /*!< How long we take to expire */
929 long branch; /*!< The branch identifier of this session */
930 char tag[11]; /*!< Our tag for this session */
931 int sessionid; /*!< SDP Session ID */
932 int sessionversion; /*!< SDP Session Version */
933 struct sockaddr_in sa; /*!< Our peer */
934 struct sockaddr_in redirip; /*!< Where our RTP should be going if not to us */
935 struct sockaddr_in vredirip; /*!< Where our Video RTP should be going if not to us */
936 time_t lastrtprx; /*!< Last RTP received */
937 time_t lastrtptx; /*!< Last RTP sent */
938 int rtptimeout; /*!< RTP timeout time */
939 int rtpholdtimeout; /*!< RTP timeout when on hold */
940 int rtpkeepalive; /*!< Send RTP packets for keepalive */
941 struct sockaddr_in recv; /*!< Received as */
942 struct in_addr ourip; /*!< Our IP */
943 struct ast_channel *owner; /*!< Who owns us (if we have an owner) */
944 struct sip_route *route; /*!< Head of linked list of routing steps (fm Record-Route) */
945 int route_persistant; /*!< Is this the "real" route? */
946 struct sip_auth *peerauth; /*!< Realm authentication */
947 int noncecount; /*!< Nonce-count */
948 char lastmsg[256]; /*!< Last Message sent/received */
949 int amaflags; /*!< AMA Flags */
950 int pendinginvite; /*!< Any pending invite ? (seqno of this) */
951 struct sip_request initreq; /*!< Initial request that opened the SIP dialog */
953 int maxtime; /*!< Max time for first response */
954 int initid; /*!< Auto-congest ID if appropriate (scheduler) */
955 int autokillid; /*!< Auto-kill ID (scheduler) */
956 enum transfermodes allowtransfer; /*!< REFER: restriction scheme */
957 struct sip_refer *refer; /*!< REFER: SIP transfer data structure */
958 enum subscriptiontype subscribed; /*!< SUBSCRIBE: Is this dialog a subscription? */
959 int stateid; /*!< SUBSCRIBE: ID for devicestate subscriptions */
960 int laststate; /*!< SUBSCRIBE: Last known extension state */
961 int dialogver; /*!< SUBSCRIBE: Version for subscription dialog-info */
963 struct ast_dsp *vad; /*!< Voice Activation Detection dsp */
965 struct sip_peer *relatedpeer; /*!< If this dialog is related to a peer, which one
966 Used in peerpoke, mwi subscriptions */
967 struct sip_registry *registry; /*!< If this is a REGISTER dialog, to which registry */
968 struct ast_rtp *rtp; /*!< RTP Session */
969 struct ast_rtp *vrtp; /*!< Video RTP session */
970 struct sip_pkt *packets; /*!< Packets scheduled for re-transmission */
971 struct sip_history_head *history; /*!< History of this SIP dialog */
972 struct ast_variable *chanvars; /*!< Channel variables to set for inbound call */
973 struct sip_pvt *next; /*!< Next dialog in chain */
974 struct sip_invite_param *options; /*!< Options for INVITE */
978 #define FLAG_RESPONSE (1 << 0)
979 #define FLAG_FATAL (1 << 1)
981 /*! \brief sip packet - raw format for outbound packets that are sent or scheduled for transmission */
983 struct sip_pkt *next; /*!< Next packet in linked list */
984 int retrans; /*!< Retransmission number */
985 int method; /*!< SIP method for this packet */
986 int seqno; /*!< Sequence number */
987 unsigned int flags; /*!< non-zero if this is a response packet (e.g. 200 OK) */
988 struct sip_pvt *owner; /*!< Owner AST call */
989 int retransid; /*!< Retransmission ID */
990 int timer_a; /*!< SIP timer A, retransmission timer */
991 int timer_t1; /*!< SIP Timer T1, estimated RTT or 500 ms */
992 int packetlen; /*!< Length of packet */
996 /*! \brief Structure for SIP user data. User's place calls to us */
998 /* Users who can access various contexts */
999 ASTOBJ_COMPONENTS(struct sip_user);
1000 char secret[80]; /*!< Password */
1001 char md5secret[80]; /*!< Password in md5 */
1002 char context[AST_MAX_CONTEXT]; /*!< Default context for incoming calls */
1003 char subscribecontext[AST_MAX_CONTEXT]; /* Default context for subscriptions */
1004 char cid_num[80]; /*!< Caller ID num */
1005 char cid_name[80]; /*!< Caller ID name */
1006 char accountcode[AST_MAX_ACCOUNT_CODE]; /* Account code */
1007 char language[MAX_LANGUAGE]; /*!< Default language for this user */
1008 char mohinterpret[MAX_MUSICCLASS];/*!< Music on Hold class */
1009 char mohsuggest[MAX_MUSICCLASS];/*!< Music on Hold class */
1010 char useragent[256]; /*!< User agent in SIP request */
1011 struct ast_codec_pref prefs; /*!< codec prefs */
1012 ast_group_t callgroup; /*!< Call group */
1013 ast_group_t pickupgroup; /*!< Pickup Group */
1014 unsigned int sipoptions; /*!< Supported SIP options */
1015 struct ast_flags flags[2]; /*!< SIP_ flags */
1016 int amaflags; /*!< AMA flags for billing */
1017 int callingpres; /*!< Calling id presentation */
1018 int capability; /*!< Codec capability */
1019 int inUse; /*!< Number of calls in use */
1020 int call_limit; /*!< Limit of concurrent calls */
1021 enum transfermodes allowtransfer; /*! SIP Refer restriction scheme */
1022 struct ast_ha *ha; /*!< ACL setting */
1023 struct ast_variable *chanvars; /*!< Variables to set for channel created by user */
1024 int maxcallbitrate; /*!< Maximum Bitrate for a video call */
1028 /*! \brief Structure for SIP peer data, we place calls to peers if registered or fixed IP address (host) */
1029 /* XXX field 'name' must be first otherwise sip_addrcmp() will fail */
1031 ASTOBJ_COMPONENTS(struct sip_peer); /*!< name, refcount, objflags, object pointers */
1032 /*!< peer->name is the unique name of this object */
1033 char secret[80]; /*!< Password */
1034 char md5secret[80]; /*!< Password in MD5 */
1035 struct sip_auth *auth; /*!< Realm authentication list */
1036 char context[AST_MAX_CONTEXT]; /*!< Default context for incoming calls */
1037 char subscribecontext[AST_MAX_CONTEXT]; /*!< Default context for subscriptions */
1038 char username[80]; /*!< Temporary username until registration */
1039 char accountcode[AST_MAX_ACCOUNT_CODE]; /*!< Account code */
1040 int amaflags; /*!< AMA Flags (for billing) */
1041 char tohost[MAXHOSTNAMELEN]; /*!< If not dynamic, IP address */
1042 char regexten[AST_MAX_EXTENSION]; /*!< Extension to register (if regcontext is used) */
1043 char fromuser[80]; /*!< From: user when calling this peer */
1044 char fromdomain[MAXHOSTNAMELEN]; /*!< From: domain when calling this peer */
1045 char fullcontact[256]; /*!< Contact registered with us (not in sip.conf) */
1046 char cid_num[80]; /*!< Caller ID num */
1047 char cid_name[80]; /*!< Caller ID name */
1048 int callingpres; /*!< Calling id presentation */
1049 int inUse; /*!< Number of calls in use */
1050 int inRinging; /*!< Number of calls ringing */
1051 int onHold; /*!< Peer has someone on hold */
1052 int call_limit; /*!< Limit of concurrent calls */
1053 enum transfermodes allowtransfer; /*! SIP Refer restriction scheme */
1054 char vmexten[AST_MAX_EXTENSION]; /*!< Dialplan extension for MWI notify message*/
1055 char mailbox[AST_MAX_EXTENSION]; /*!< Mailbox setting for MWI checks */
1056 char language[MAX_LANGUAGE]; /*!< Default language for prompts */
1057 char mohinterpret[MAX_MUSICCLASS];/*!< Music on Hold class */
1058 char mohsuggest[MAX_MUSICCLASS];/*!< Music on Hold class */
1059 char useragent[256]; /*!< User agent in SIP request (saved from registration) */
1060 struct ast_codec_pref prefs; /*!< codec prefs */
1062 time_t lastmsgcheck; /*!< Last time we checked for MWI */
1063 unsigned int sipoptions; /*!< Supported SIP options */
1064 struct ast_flags flags[2]; /*!< SIP_ flags */
1065 int expire; /*!< When to expire this peer registration */
1066 int capability; /*!< Codec capability */
1067 int rtptimeout; /*!< RTP timeout */
1068 int rtpholdtimeout; /*!< RTP Hold Timeout */
1069 int rtpkeepalive; /*!< Send RTP packets for keepalive */
1070 ast_group_t callgroup; /*!< Call group */
1071 ast_group_t pickupgroup; /*!< Pickup group */
1072 struct ast_dnsmgr_entry *dnsmgr;/*!< DNS refresh manager for peer */
1073 struct sockaddr_in addr; /*!< IP address of peer */
1074 int maxcallbitrate; /*!< Maximum Bitrate for a video call */
1077 struct sip_pvt *call; /*!< Call pointer */
1078 int pokeexpire; /*!< When to expire poke (qualify= checking) */
1079 int lastms; /*!< How long last response took (in ms), or -1 for no response */
1080 int maxms; /*!< Max ms we will accept for the host to be up, 0 to not monitor */
1081 struct timeval ps; /*!< Ping send time */
1083 struct sockaddr_in defaddr; /*!< Default IP address, used until registration */
1084 struct ast_ha *ha; /*!< Access control list */
1085 struct ast_variable *chanvars; /*!< Variables to set for channel created by user */
1086 struct sip_pvt *mwipvt; /*!< Subscription for MWI */
1093 /*! \brief Registrations with other SIP proxies */
1094 struct sip_registry {
1095 ASTOBJ_COMPONENTS_FULL(struct sip_registry,1,1);
1096 AST_DECLARE_STRING_FIELDS(
1097 AST_STRING_FIELD(callid); /*!< Global Call-ID */
1098 AST_STRING_FIELD(realm); /*!< Authorization realm */
1099 AST_STRING_FIELD(nonce); /*!< Authorization nonce */
1100 AST_STRING_FIELD(opaque); /*!< Opaque nonsense */
1101 AST_STRING_FIELD(qop); /*!< Quality of Protection, since SIP wasn't complicated enough yet. */
1102 AST_STRING_FIELD(domain); /*!< Authorization domain */
1103 AST_STRING_FIELD(username); /*!< Who we are registering as */
1104 AST_STRING_FIELD(authuser); /*!< Who we *authenticate* as */
1105 AST_STRING_FIELD(hostname); /*!< Domain or host we register to */
1106 AST_STRING_FIELD(secret); /*!< Password in clear text */
1107 AST_STRING_FIELD(md5secret); /*!< Password in md5 */
1108 AST_STRING_FIELD(contact); /*!< Contact extension */
1109 AST_STRING_FIELD(random);
1111 int portno; /*!< Optional port override */
1112 int expire; /*!< Sched ID of expiration */
1113 int regattempts; /*!< Number of attempts (since the last success) */
1114 int timeout; /*!< sched id of sip_reg_timeout */
1115 int refresh; /*!< How often to refresh */
1116 struct sip_pvt *call; /*!< create a sip_pvt structure for each outbound "registration dialog" in progress */
1117 enum sipregistrystate regstate; /*!< Registration state (see above) */
1118 time_t regtime; /*!< Last succesful registration time */
1119 int callid_valid; /*!< 0 means we haven't chosen callid for this registry yet. */
1120 unsigned int ocseq; /*!< Sequence number we got to for REGISTERs for this registry */
1121 struct sockaddr_in us; /*!< Who the server thinks we are */
1122 int noncecount; /*!< Nonce-count */
1123 char lastmsg[256]; /*!< Last Message sent/received */
1126 /* --- Linked lists of various objects --------*/
1128 /*! \brief The user list: Users and friends */
1129 static struct ast_user_list {
1130 ASTOBJ_CONTAINER_COMPONENTS(struct sip_user);
1133 /*! \brief The peer list: Peers and Friends */
1134 static struct ast_peer_list {
1135 ASTOBJ_CONTAINER_COMPONENTS(struct sip_peer);
1138 /*! \brief The register list: Other SIP proxys we register with and place calls to */
1139 static struct ast_register_list {
1140 ASTOBJ_CONTAINER_COMPONENTS(struct sip_registry);
1144 /*! \todo Move the sip_auth list to AST_LIST */
1145 static struct sip_auth *authl = NULL; /*!< Authentication list for realm authentication */
1148 /* --- Sockets and networking --------------*/
1149 static int sipsock = -1; /*!< Main socket for SIP network communication */
1150 static struct sockaddr_in bindaddr = { 0, }; /*!< The address we bind to */
1151 static struct sockaddr_in externip; /*!< External IP address if we are behind NAT */
1152 static char externhost[MAXHOSTNAMELEN]; /*!< External host name (possibly with dynamic DNS and DHCP */
1153 static time_t externexpire = 0; /*!< Expiration counter for re-resolving external host name in dynamic DNS */
1154 static int externrefresh = 10;
1155 static struct ast_ha *localaddr; /*!< List of local networks, on the same side of NAT as this Asterisk */
1156 static struct in_addr __ourip;
1157 static struct sockaddr_in outboundproxyip;
1159 static struct sockaddr_in debugaddr;
1161 static struct ast_config *notify_types; /*!< The list of manual NOTIFY types we know how to send */
1163 /*---------------------------- Forward declarations of functions in chan_sip.c */
1164 /*! \note This is added to help splitting up chan_sip.c into several files
1165 in coming releases */
1167 /*--- PBX interface functions */
1168 static struct ast_channel *sip_request_call(const char *type, int format, void *data, int *cause);
1169 static int sip_devicestate(void *data);
1170 static int sip_sendtext(struct ast_channel *ast, const char *text);
1171 static int sip_call(struct ast_channel *ast, char *dest, int timeout);
1172 static int sip_hangup(struct ast_channel *ast);
1173 static int sip_answer(struct ast_channel *ast);
1174 static struct ast_frame *sip_read(struct ast_channel *ast);
1175 static int sip_write(struct ast_channel *ast, struct ast_frame *frame);
1176 static int sip_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen);
1177 static int sip_transfer(struct ast_channel *ast, const char *dest);
1178 static int sip_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
1179 static int sip_senddigit_begin(struct ast_channel *ast, char digit);
1180 static int sip_senddigit_end(struct ast_channel *ast, char digit);
1182 /*--- Transmitting responses and requests */
1183 static int sipsock_read(int *id, int fd, short events, void *ignore);
1184 static int __sip_xmit(struct sip_pvt *p, char *data, int len);
1185 static int __sip_reliable_xmit(struct sip_pvt *p, int seqno, int resp, char *data, int len, int fatal, int sipmethod);
1186 static int __transmit_response(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
1187 static int retrans_pkt(void *data);
1188 static int transmit_sip_request(struct sip_pvt *p, struct sip_request *req);
1189 static int transmit_response(struct sip_pvt *p, const char *msg, const struct sip_request *req);
1190 static int transmit_response_reliable(struct sip_pvt *p, const char *msg, const struct sip_request *req);
1191 static int transmit_response_with_date(struct sip_pvt *p, const char *msg, const struct sip_request *req);
1192 static int transmit_response_with_sdp(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
1193 static int transmit_response_with_unsupported(struct sip_pvt *p, const char *msg, const struct sip_request *req, const char *unsupported);
1194 static int transmit_response_with_auth(struct sip_pvt *p, const char *msg, const struct sip_request *req, const char *rand, enum xmittype reliable, const char *header, int stale);
1195 static int transmit_response_with_allow(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
1196 static void transmit_fake_auth_response(struct sip_pvt *p, struct sip_request *req, int reliable);
1197 static int transmit_request(struct sip_pvt *p, int sipmethod, int inc, enum xmittype reliable, int newbranch);
1198 static int transmit_request_with_auth(struct sip_pvt *p, int sipmethod, int seqno, enum xmittype reliable, int newbranch);
1199 static int transmit_invite(struct sip_pvt *p, int sipmethod, int sdp, int init);
1200 static int transmit_reinvite_with_sdp(struct sip_pvt *p);
1201 static int transmit_info_with_digit(struct sip_pvt *p, const char digit);
1202 static int transmit_info_with_vidupdate(struct sip_pvt *p);
1203 static int transmit_message_with_text(struct sip_pvt *p, const char *text);
1204 static int transmit_refer(struct sip_pvt *p, const char *dest);
1205 static int transmit_notify_with_mwi(struct sip_pvt *p, int newmsgs, int oldmsgs, char *vmexten);
1206 static int transmit_notify_with_sipfrag(struct sip_pvt *p, int cseq, char *message, int terminate);
1207 static int transmit_state_notify(struct sip_pvt *p, int state, int full);
1208 static int transmit_register(struct sip_registry *r, int sipmethod, const char *auth, const char *authheader);
1209 static int send_response(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno);
1210 static int send_request(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno);
1211 static void copy_request(struct sip_request *dst, const struct sip_request *src);
1212 static void receive_message(struct sip_pvt *p, struct sip_request *req);
1213 static void parse_moved_contact(struct sip_pvt *p, struct sip_request *req);
1214 static int sip_send_mwi_to_peer(struct sip_peer *peer);
1215 static int does_peer_need_mwi(struct sip_peer *peer);
1217 /*--- Dialog management */
1218 static struct sip_pvt *sip_alloc(ast_string_field callid, struct sockaddr_in *sin,
1219 int useglobal_nat, const int intended_method);
1220 static int __sip_autodestruct(void *data);
1221 static void sip_scheddestroy(struct sip_pvt *p, int ms);
1222 static void sip_cancel_destroy(struct sip_pvt *p);
1223 static void sip_destroy(struct sip_pvt *p);
1224 static void __sip_destroy(struct sip_pvt *p, int lockowner);
1225 static void __sip_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod, int reset);
1226 static void __sip_pretend_ack(struct sip_pvt *p);
1227 static int __sip_semi_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod);
1228 static int auto_congest(void *nothing);
1229 static int update_call_counter(struct sip_pvt *fup, int event);
1230 static int hangup_sip2cause(int cause);
1231 static const char *hangup_cause2sip(int cause);
1232 static struct sip_pvt *find_call(struct sip_request *req, struct sockaddr_in *sin, const int intended_method);
1233 static void free_old_route(struct sip_route *route);
1234 static void list_route(struct sip_route *route);
1235 static void build_route(struct sip_pvt *p, struct sip_request *req, int backwards);
1236 static enum check_auth_result register_verify(struct sip_pvt *p, struct sockaddr_in *sin,
1237 struct sip_request *req, char *uri);
1238 static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag);
1239 static void check_pendings(struct sip_pvt *p);
1240 static void *sip_park_thread(void *stuff);
1241 static int sip_park(struct ast_channel *chan1, struct ast_channel *chan2, struct sip_request *req, int seqno);
1242 static int sip_sipredirect(struct sip_pvt *p, const char *dest);
1244 /*--- Codec handling / SDP */
1245 static void try_suggested_sip_codec(struct sip_pvt *p);
1246 static const char* get_sdp_iterate(int* start, struct sip_request *req, const char *name);
1247 static const char *get_sdp(struct sip_request *req, const char *name);
1248 static int find_sdp(struct sip_request *req);
1249 static int process_sdp(struct sip_pvt *p, struct sip_request *req);
1250 static void add_codec_to_sdp(const struct sip_pvt *p, int codec, int sample_rate,
1251 char **m_buf, size_t *m_size, char **a_buf, size_t *a_size,
1252 int debug, int *min_packet_size);
1253 static void add_noncodec_to_sdp(const struct sip_pvt *p, int format, int sample_rate,
1254 char **m_buf, size_t *m_size, char **a_buf, size_t *a_size,
1256 static int add_sdp(struct sip_request *resp, struct sip_pvt *p);
1257 static void do_setnat(struct sip_pvt *p, int natflags);
1259 /*--- Authentication stuff */
1260 static int reply_digest(struct sip_pvt *p, struct sip_request *req, char *header, int sipmethod, char *digest, int digest_len);
1261 static int build_reply_digest(struct sip_pvt *p, int method, char *digest, int digest_len);
1262 static int clear_realm_authentication(struct sip_auth *authlist); /* Clear realm authentication list (at reload) */
1263 static struct sip_auth *add_realm_authentication(struct sip_auth *authlist, char *configuration, int lineno); /* Add realm authentication in list */
1264 static struct sip_auth *find_realm_authentication(struct sip_auth *authlist, const char *realm); /* Find authentication for a specific realm */
1265 static enum check_auth_result check_auth(struct sip_pvt *p, struct sip_request *req, const char *username,
1266 const char *secret, const char *md5secret, int sipmethod,
1267 char *uri, enum xmittype reliable, int ignore);
1268 static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_request *req,
1269 int sipmethod, char *uri, enum xmittype reliable,
1270 struct sockaddr_in *sin, struct sip_peer **authpeer);
1271 static int check_user(struct sip_pvt *p, struct sip_request *req, int sipmethod, char *uri, enum xmittype reliable, struct sockaddr_in *sin);
1273 /*--- Domain handling */
1274 static int check_sip_domain(const char *domain, char *context, size_t len); /* Check if domain is one of our local domains */
1275 static int add_sip_domain(const char *domain, const enum domain_mode mode, const char *context);
1276 static void clear_sip_domains(void);
1278 /*--- SIP realm authentication */
1279 static struct sip_auth *add_realm_authentication(struct sip_auth *authlist, char *configuration, int lineno);
1280 static int clear_realm_authentication(struct sip_auth *authlist);
1281 static struct sip_auth *find_realm_authentication(struct sip_auth *authlist, const char *realm);
1283 /*--- Misc functions */
1284 static int sip_do_reload(enum channelreloadreason reason);
1285 static int reload_config(enum channelreloadreason reason);
1286 static int expire_register(void *data);
1287 static int sip_sipredirect(struct sip_pvt *p, const char *dest);
1288 static void *do_monitor(void *data);
1289 static int restart_monitor(void);
1290 static int sip_send_mwi_to_peer(struct sip_peer *peer);
1291 static void sip_destroy(struct sip_pvt *p);
1292 static int sip_addrcmp(char *name, struct sockaddr_in *sin); /* Support for peer matching */
1293 static int sip_refer_allocate(struct sip_pvt *p);
1294 static void ast_quiet_chan(struct ast_channel *chan);
1295 static int attempt_transfer(struct sip_dual *transferer, struct sip_dual *target);
1297 /*--- Device monitoring and Device/extension state handling */
1298 static int cb_extensionstate(char *context, char* exten, int state, void *data);
1299 static int sip_devicestate(void *data);
1300 static int sip_poke_noanswer(void *data);
1301 static int sip_poke_peer(struct sip_peer *peer);
1302 static void sip_poke_all_peers(void);
1303 static void sip_peer_hold(struct sip_pvt *p, int hold);
1305 /*--- Applications, functions, CLI and manager command helpers */
1306 static const char *sip_nat_mode(const struct sip_pvt *p);
1307 static int sip_show_inuse(int fd, int argc, char *argv[]);
1308 static char *transfermode2str(enum transfermodes mode) attribute_const;
1309 static char *nat2str(int nat) attribute_const;
1310 static int peer_status(struct sip_peer *peer, char *status, int statuslen);
1311 static int sip_show_users(int fd, int argc, char *argv[]);
1312 static int _sip_show_peers(int fd, int *total, struct mansession *s, struct message *m, int argc, char *argv[]);
1313 static int manager_sip_show_peers( struct mansession *s, struct message *m );
1314 static int sip_show_peers(int fd, int argc, char *argv[]);
1315 static int sip_show_objects(int fd, int argc, char *argv[]);
1316 static void print_group(int fd, ast_group_t group, int crlf);
1317 static const char *dtmfmode2str(int mode) attribute_const;
1318 static const char *insecure2str(int port, int invite) attribute_const;
1319 static void cleanup_stale_contexts(char *new, char *old);
1320 static void print_codec_to_cli(int fd, struct ast_codec_pref *pref);
1321 static const char *domain_mode_to_text(const enum domain_mode mode);
1322 static int sip_show_domains(int fd, int argc, char *argv[]);
1323 static int _sip_show_peer(int type, int fd, struct mansession *s, struct message *m, int argc, char *argv[]);
1324 static int manager_sip_show_peer( struct mansession *s, struct message *m);
1325 static int sip_show_peer(int fd, int argc, char *argv[]);
1326 static int _sip_show_peer(int type, int fd, struct mansession *s, struct message *m, int argc, char *argv[]);
1327 static int sip_show_user(int fd, int argc, char *argv[]);
1328 static int sip_show_registry(int fd, int argc, char *argv[]);
1329 static int sip_show_settings(int fd, int argc, char *argv[]);
1330 static const char *subscription_type2str(enum subscriptiontype subtype) attribute_pure;
1331 static const struct cfsubscription_types *find_subscription_type(enum subscriptiontype subtype);
1332 static int __sip_show_channels(int fd, int argc, char *argv[], int subscriptions);
1333 static int sip_show_channels(int fd, int argc, char *argv[]);
1334 static int sip_show_subscriptions(int fd, int argc, char *argv[]);
1335 static int __sip_show_channels(int fd, int argc, char *argv[], int subscriptions);
1336 static char *complete_sipch(const char *line, const char *word, int pos, int state);
1337 static char *complete_sip_peer(const char *word, int state, int flags2);
1338 static char *complete_sip_show_peer(const char *line, const char *word, int pos, int state);
1339 static char *complete_sip_debug_peer(const char *line, const char *word, int pos, int state);
1340 static char *complete_sip_user(const char *word, int state, int flags2);
1341 static char *complete_sip_show_user(const char *line, const char *word, int pos, int state);
1342 static char *complete_sipnotify(const char *line, const char *word, int pos, int state);
1343 static char *complete_sip_prune_realtime_peer(const char *line, const char *word, int pos, int state);
1344 static char *complete_sip_prune_realtime_user(const char *line, const char *word, int pos, int state);
1345 static int sip_show_channel(int fd, int argc, char *argv[]);
1346 static int sip_show_history(int fd, int argc, char *argv[]);
1347 static int sip_do_debug_ip(int fd, int argc, char *argv[]);
1348 static int sip_do_debug_peer(int fd, int argc, char *argv[]);
1349 static int sip_do_debug(int fd, int argc, char *argv[]);
1350 static int sip_no_debug(int fd, int argc, char *argv[]);
1351 static int sip_notify(int fd, int argc, char *argv[]);
1352 static int sip_do_history(int fd, int argc, char *argv[]);
1353 static int sip_no_history(int fd, int argc, char *argv[]);
1354 static int func_header_read(struct ast_channel *chan, char *function, char *data, char *buf, size_t len);
1355 static int func_check_sipdomain(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len);
1356 static int function_sippeer(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len);
1357 static int function_sipchaninfo_read(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len);
1358 static int sip_dtmfmode(struct ast_channel *chan, void *data);
1359 static int sip_addheader(struct ast_channel *chan, void *data);
1360 static int sip_do_reload(enum channelreloadreason reason);
1361 static int sip_reload(int fd, int argc, char *argv[]);
1364 Functions for enabling debug per IP or fully, or enabling history logging for
1367 static void sip_dump_history(struct sip_pvt *dialog); /* Dump history to LOG_DEBUG at end of dialog, before destroying data */
1368 static inline int sip_debug_test_addr(const struct sockaddr_in *addr);
1369 static inline int sip_debug_test_pvt(struct sip_pvt *p);
1370 static void append_history_full(struct sip_pvt *p, const char *fmt, ...);
1371 static void sip_dump_history(struct sip_pvt *dialog);
1373 /*--- Device object handling */
1374 static struct sip_peer *temp_peer(const char *name);
1375 static struct sip_peer *build_peer(const char *name, struct ast_variable *v, struct ast_variable *alt, int realtime);
1376 static struct sip_user *build_user(const char *name, struct ast_variable *v, int realtime);
1377 static int update_call_counter(struct sip_pvt *fup, int event);
1378 static void sip_destroy_peer(struct sip_peer *peer);
1379 static void sip_destroy_user(struct sip_user *user);
1380 static int sip_poke_peer(struct sip_peer *peer);
1381 static void set_peer_defaults(struct sip_peer *peer);
1382 static struct sip_peer *temp_peer(const char *name);
1383 static void register_peer_exten(struct sip_peer *peer, int onoff);
1384 static void sip_destroy_peer(struct sip_peer *peer);
1385 static void sip_destroy_user(struct sip_user *user);
1386 static struct sip_peer *find_peer(const char *peer, struct sockaddr_in *sin, int realtime);
1387 static struct sip_user *find_user(const char *name, int realtime);
1388 static int sip_poke_peer_s(void *data);
1389 static enum parse_register_result parse_register_contact(struct sip_pvt *pvt, struct sip_peer *p, struct sip_request *req);
1390 static int expire_register(void *data);
1391 static void reg_source_db(struct sip_peer *peer);
1392 static void destroy_association(struct sip_peer *peer);
1393 static int handle_common_options(struct ast_flags *flags, struct ast_flags *mask, struct ast_variable *v);
1395 /* Realtime device support */
1396 static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, const char *username, const char *fullcontact, int expirey);
1397 static struct sip_user *realtime_user(const char *username);
1398 static void update_peer(struct sip_peer *p, int expiry);
1399 static struct sip_peer *realtime_peer(const char *peername, struct sockaddr_in *sin);
1400 static int sip_prune_realtime(int fd, int argc, char *argv[]);
1402 /*--- Internal UA client handling (outbound registrations) */
1403 static int ast_sip_ouraddrfor(struct in_addr *them, struct in_addr *us);
1404 static void sip_registry_destroy(struct sip_registry *reg);
1405 static int sip_register(char *value, int lineno);
1406 static char *regstate2str(enum sipregistrystate regstate) attribute_const;
1407 static int sip_reregister(void *data);
1408 static int __sip_do_register(struct sip_registry *r);
1409 static int sip_reg_timeout(void *data);
1410 static int reply_digest(struct sip_pvt *p, struct sip_request *req, char *header, int sipmethod, char *digest, int digest_len);
1411 static void sip_send_all_registers(void);
1413 /*--- Parsing SIP requests and responses */
1414 static void append_date(struct sip_request *req); /* Append date to SIP packet */
1415 static int determine_firstline_parts(struct sip_request *req);
1416 static const struct cfsubscription_types *find_subscription_type(enum subscriptiontype subtype);
1417 static const char *gettag(const struct sip_request *req, const char *header, char *tagbuf, int tagbufsize);
1418 static int find_sip_method(const char *msg);
1419 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported);
1420 static void parse_request(struct sip_request *req);
1421 static const char *get_header(const struct sip_request *req, const char *name);
1422 static char *referstatus2str(enum referstatus rstatus) attribute_pure;
1423 static int method_match(enum sipmethod id, const char *name);
1424 static void parse_copy(struct sip_request *dst, const struct sip_request *src);
1425 static char *get_in_brackets(char *tmp);
1426 static const char *find_alias(const char *name, const char *_default);
1427 static const char *__get_header(const struct sip_request *req, const char *name, int *start);
1428 static const char *get_header(const struct sip_request *req, const char *name);
1429 static int lws2sws(char *msgbuf, int len);
1430 static void extract_uri(struct sip_pvt *p, struct sip_request *req);
1431 static int get_refer_info(struct sip_pvt *transferer, struct sip_request *outgoing_req);
1432 static int get_also_info(struct sip_pvt *p, struct sip_request *oreq);
1433 static int parse_ok_contact(struct sip_pvt *pvt, struct sip_request *req);
1434 static int set_address_from_contact(struct sip_pvt *pvt);
1435 static void check_via(struct sip_pvt *p, struct sip_request *req);
1436 static char *get_calleridname(const char *input, char *output, size_t outputsize);
1437 static int get_rpid_num(const char *input, char *output, int maxlen);
1438 static int get_rdnis(struct sip_pvt *p, struct sip_request *oreq);
1439 static int get_destination(struct sip_pvt *p, struct sip_request *oreq);
1440 static int get_msg_text(char *buf, int len, struct sip_request *req);
1441 static const char *gettag(const struct sip_request *req, const char *header, char *tagbuf, int tagbufsize);
1442 static void free_old_route(struct sip_route *route);
1444 /*--- Constructing requests and responses */
1445 static void initialize_initreq(struct sip_pvt *p, struct sip_request *req);
1446 static int init_req(struct sip_request *req, int sipmethod, const char *recip);
1447 static int reqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod, int seqno, int newbranch);
1448 static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod);
1449 static int init_resp(struct sip_request *resp, const char *msg);
1450 static int respprep(struct sip_request *resp, struct sip_pvt *p, const char *msg, const struct sip_request *req);
1451 static const struct sockaddr_in *sip_real_dst(const struct sip_pvt *p);
1452 static void build_via(struct sip_pvt *p);
1453 static int create_addr_from_peer(struct sip_pvt *r, struct sip_peer *peer);
1454 static int create_addr(struct sip_pvt *dialog, const char *opeer);
1455 static char *generate_random_string(char *buf, size_t size);
1456 static void build_callid_pvt(struct sip_pvt *pvt);
1457 static void build_callid_registry(struct sip_registry *reg, struct in_addr ourip, const char *fromdomain);
1458 static void make_our_tag(char *tagbuf, size_t len);
1459 static int add_header(struct sip_request *req, const char *var, const char *value);
1460 static int add_header_contentLength(struct sip_request *req, int len);
1461 static int add_line(struct sip_request *req, const char *line);
1462 static int add_text(struct sip_request *req, const char *text);
1463 static int add_digit(struct sip_request *req, char digit);
1464 static int add_vidupdate(struct sip_request *req);
1465 static void add_route(struct sip_request *req, struct sip_route *route);
1466 static int copy_header(struct sip_request *req, const struct sip_request *orig, const char *field);
1467 static int copy_all_header(struct sip_request *req, const struct sip_request *orig, const char *field);
1468 static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, const struct sip_request *orig, const char *field);
1469 static void set_destination(struct sip_pvt *p, char *uri);
1470 static void append_date(struct sip_request *req);
1471 static void build_contact(struct sip_pvt *p);
1472 static void build_rpid(struct sip_pvt *p);
1474 /*------Request handling functions */
1475 static int handle_request(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int *recount, int *nounlock);
1476 static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int debug, int seqno, struct sockaddr_in *sin, int *recount, char *e);
1477 static int handle_request_refer(struct sip_pvt *p, struct sip_request *req, int debug, int ignore, int seqno, int *nounlock);
1478 static int handle_request_bye(struct sip_pvt *p, struct sip_request *req);
1479 static int handle_request_register(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, char *e);
1480 static int handle_request_cancel(struct sip_pvt *p, struct sip_request *req);
1481 static int handle_request_message(struct sip_pvt *p, struct sip_request *req);
1482 static int handle_request_subscribe(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int seqno, char *e);
1483 static void handle_request_info(struct sip_pvt *p, struct sip_request *req);
1484 static int handle_request_options(struct sip_pvt *p, struct sip_request *req);
1485 static int handle_invite_replaces(struct sip_pvt *p, struct sip_request *req, int debug, int ignore, int seqno, struct sockaddr_in *sin);
1486 static int handle_request_notify(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int seqno, char *e);
1487 static int handle_invite_replaces(struct sip_pvt *p, struct sip_request *req, int debug, int ignore, int seqno, struct sockaddr_in *sin);
1488 static int local_attended_transfer(struct sip_pvt *transferer, struct sip_dual *current, struct sip_request *req, int seqno);
1490 /*------Response handling functions */
1491 static void handle_response_invite(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int seqno);
1492 static void handle_response_refer(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int seqno);
1493 static int handle_response_register(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int ignore, int seqno);
1494 static void handle_response(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int ignore, int seqno);
1496 /*----- RTP interface functions */
1497 static int sip_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp, struct ast_rtp *vrtp, int codecs, int nat_active);
1498 static enum ast_rtp_get_result sip_get_rtp_peer(struct ast_channel *chan, struct ast_rtp **rtp);
1499 static enum ast_rtp_get_result sip_get_vrtp_peer(struct ast_channel *chan, struct ast_rtp **rtp);
1500 static int sip_get_codec(struct ast_channel *chan);
1501 static struct ast_frame *sip_rtp_read(struct ast_channel *ast, struct sip_pvt *p, int *faxdetect);
1503 /*------ T38 Support --------- */
1504 static int sip_handle_t38_reinvite(struct ast_channel *chan, struct sip_pvt *pvt, int reinvite); /*!< T38 negotiation helper function */
1505 static int transmit_response_with_t38_sdp(struct sip_pvt *p, char *msg, struct sip_request *req, int retrans);
1506 static int transmit_reinvite_with_t38_sdp(struct sip_pvt *p);
1507 static struct ast_udptl *sip_get_udptl_peer(struct ast_channel *chan);
1508 static int sip_set_udptl_peer(struct ast_channel *chan, struct ast_udptl *udptl);
1510 /*! \brief Definition of this channel for PBX channel registration */
1511 static const struct ast_channel_tech sip_tech = {
1513 .description = "Session Initiation Protocol (SIP)",
1514 .capabilities = ((AST_FORMAT_MAX_AUDIO << 1) - 1),
1515 .properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
1516 .requester = sip_request_call,
1517 .devicestate = sip_devicestate,
1519 .hangup = sip_hangup,
1520 .answer = sip_answer,
1523 .write_video = sip_write,
1524 .indicate = sip_indicate,
1525 .transfer = sip_transfer,
1527 .send_digit_begin = sip_senddigit_begin,
1528 .send_digit_end = sip_senddigit_end,
1529 .bridge = ast_rtp_bridge,
1530 .early_bridge = ast_rtp_early_bridge,
1531 .send_text = sip_sendtext,
1534 /**--- some list management macros. **/
1536 #define UNLINK(element, head, prev) do { \
1538 (prev)->next = (element)->next; \
1540 (head) = (element)->next; \
1543 /*! \brief Interface structure with callbacks used to connect to RTP module */
1544 static struct ast_rtp_protocol sip_rtp = {
1546 get_rtp_info: sip_get_rtp_peer,
1547 get_vrtp_info: sip_get_vrtp_peer,
1548 set_rtp_peer: sip_set_rtp_peer,
1549 get_codec: sip_get_codec,
1552 /*! \brief Interface structure with callbacks used to connect to UDPTL module*/
1553 static struct ast_udptl_protocol sip_udptl = {
1555 get_udptl_info: sip_get_udptl_peer,
1556 set_udptl_peer: sip_set_udptl_peer,
1559 /*! \brief Convert transfer status to string */
1560 static char *referstatus2str(enum referstatus rstatus)
1562 int i = (sizeof(referstatusstrings) / sizeof(referstatusstrings[0]));
1565 for (x = 0; x < i; x++) {
1566 if (referstatusstrings[x].status == rstatus)
1567 return (char *) referstatusstrings[x].text;
1572 /*! \brief Initialize the initital request packet in the pvt structure.
1573 This packet is used for creating replies and future requests in
1575 static void initialize_initreq(struct sip_pvt *p, struct sip_request *req)
1577 if (p->initreq.headers && option_debug) {
1578 ast_log(LOG_DEBUG, "Initializing already initialized SIP dialog %s (presumably reinvite)\n", p->callid);
1580 /* Use this as the basis */
1581 copy_request(&p->initreq, req);
1582 parse_request(&p->initreq);
1583 if (ast_test_flag(req, SIP_PKT_DEBUG))
1584 ast_verbose("%d headers, %d lines\n", p->initreq.headers, p->initreq.lines);
1588 /*! \brief returns true if 'name' (with optional trailing whitespace)
1589 * matches the sip method 'id'.
1590 * Strictly speaking, SIP methods are case SENSITIVE, but we do
1591 * a case-insensitive comparison to be more tolerant.
1592 * following Jon Postel's rule: Be gentle in what you accept, strict with what you send
1594 static int method_match(enum sipmethod id, const char *name)
1596 int len = strlen(sip_methods[id].text);
1597 int l_name = name ? strlen(name) : 0;
1598 /* true if the string is long enough, and ends with whitespace, and matches */
1599 return (l_name >= len && name[len] < 33 &&
1600 !strncasecmp(sip_methods[id].text, name, len));
1603 /*! \brief find_sip_method: Find SIP method from header */
1604 static int find_sip_method(const char *msg)
1608 if (ast_strlen_zero(msg))
1610 for (i = 1; i < (sizeof(sip_methods) / sizeof(sip_methods[0])) && !res; i++) {
1611 if (method_match(i, msg))
1612 res = sip_methods[i].id;
1617 /*! \brief Parse supported header in incoming packet */
1618 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported)
1621 char *temp = ast_strdupa(supported);
1622 unsigned int profile = 0;
1625 if (ast_strlen_zero(supported) )
1628 if (option_debug > 2 && sipdebug)
1629 ast_log(LOG_DEBUG, "Begin: parsing SIP \"Supported: %s\"\n", supported);
1631 for (next = temp; next; next = sep) {
1633 if ( (sep = strchr(next, ',')) != NULL)
1635 next = ast_skip_blanks(next);
1636 if (option_debug > 2 && sipdebug)
1637 ast_log(LOG_DEBUG, "Found SIP option: -%s-\n", next);
1638 for (i=0; i < (sizeof(sip_options) / sizeof(sip_options[0])); i++) {
1639 if (!strcasecmp(next, sip_options[i].text)) {
1640 profile |= sip_options[i].id;
1642 if (option_debug > 2 && sipdebug)
1643 ast_log(LOG_DEBUG, "Matched SIP option: %s\n", next);
1647 if (!found && option_debug > 2 && sipdebug) {
1648 if (!strncasecmp(next, "x-", 2))
1649 ast_log(LOG_DEBUG, "Found private SIP option, not supported: %s\n", next);
1651 ast_log(LOG_DEBUG, "Found no match for SIP option: %s (Please file bug report!)\n", next);
1656 pvt->sipoptions = profile;
1660 /*! \brief See if we pass debug IP filter */
1661 static inline int sip_debug_test_addr(const struct sockaddr_in *addr)
1665 if (debugaddr.sin_addr.s_addr) {
1666 if (((ntohs(debugaddr.sin_port) != 0)
1667 && (debugaddr.sin_port != addr->sin_port))
1668 || (debugaddr.sin_addr.s_addr != addr->sin_addr.s_addr))
1674 /*! \brief The real destination address for a write */
1675 static const struct sockaddr_in *sip_real_dst(const struct sip_pvt *p)
1677 return ast_test_flag(&p->flags[0], SIP_NAT) & SIP_NAT_ROUTE ? &p->recv : &p->sa;
1680 /*! \brief Display SIP nat mode */
1681 static const char *sip_nat_mode(const struct sip_pvt *p)
1683 return ast_test_flag(&p->flags[0], SIP_NAT) & SIP_NAT_ROUTE ? "NAT" : "no NAT";
1686 /*! \brief Test PVT for debugging output */
1687 static inline int sip_debug_test_pvt(struct sip_pvt *p)
1691 return sip_debug_test_addr(sip_real_dst(p));
1694 /*! \brief Transmit SIP message */
1695 static int __sip_xmit(struct sip_pvt *p, char *data, int len)
1698 const struct sockaddr_in *dst = sip_real_dst(p);
1699 res = sendto(sipsock, data, len, 0, (const struct sockaddr *)dst, sizeof(struct sockaddr_in));
1702 ast_log(LOG_WARNING, "sip_xmit of %p (len %d) to %s:%d returned %d: %s\n", data, len, ast_inet_ntoa(dst->sin_addr), ntohs(dst->sin_port), res, strerror(errno));
1707 /*! \brief Build a Via header for a request */
1708 static void build_via(struct sip_pvt *p)
1710 /* Work around buggy UNIDEN UIP200 firmware */
1711 const char *rport = ast_test_flag(&p->flags[0], SIP_NAT) & SIP_NAT_RFC3581 ? ";rport" : "";
1713 /* z9hG4bK is a magic cookie. See RFC 3261 section 8.1.1.7 */
1714 ast_string_field_build(p, via, "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x%s",
1715 ast_inet_ntoa(p->ourip), ourport, p->branch, rport);
1718 /*! \brief NAT fix - decide which IP address to use for ASterisk server?
1720 * Using the localaddr structure built up with localnet statements in sip.conf
1721 * apply it to their address to see if we need to substitute our
1722 * externip or can get away with our internal bindaddr
1724 static enum sip_result ast_sip_ouraddrfor(struct in_addr *them, struct in_addr *us)
1726 struct sockaddr_in theirs, ours;
1728 /* Get our local information */
1729 ast_ouraddrfor(them, us);
1730 theirs.sin_addr = *them;
1731 ours.sin_addr = *us;
1733 if (localaddr && externip.sin_addr.s_addr &&
1734 ast_apply_ha(localaddr, &theirs) &&
1735 !ast_apply_ha(localaddr, &ours)) {
1736 if (externexpire && time(NULL) >= externexpire) {
1737 struct ast_hostent ahp;
1740 externexpire = time(NULL) + externrefresh;
1741 if ((hp = ast_gethostbyname(externhost, &ahp))) {
1742 memcpy(&externip.sin_addr, hp->h_addr, sizeof(externip.sin_addr));
1744 ast_log(LOG_NOTICE, "Warning: Re-lookup of '%s' failed!\n", externhost);
1746 *us = externip.sin_addr;
1748 ast_log(LOG_DEBUG, "Target address %s is not local, substituting externip\n",
1749 ast_inet_ntoa(*(struct in_addr *)&them->s_addr));
1751 } else if (bindaddr.sin_addr.s_addr)
1752 *us = bindaddr.sin_addr;
1756 /*! \brief Append to SIP dialog history
1757 \return Always returns 0 */
1758 #define append_history(p, event, fmt , args... ) append_history_full(p, "%-15s " fmt, event, ## args)
1760 static void append_history_full(struct sip_pvt *p, const char *fmt, ...)
1761 __attribute__ ((format (printf, 2, 3)));
1763 /*! \brief Append to SIP dialog history with arg list */
1764 static void append_history_va(struct sip_pvt *p, const char *fmt, va_list ap)
1766 char buf[80], *c = buf; /* max history length */
1767 struct sip_history *hist;
1770 vsnprintf(buf, sizeof(buf), fmt, ap);
1771 strsep(&c, "\r\n"); /* Trim up everything after \r or \n */
1772 l = strlen(buf) + 1;
1773 if (!(hist = ast_calloc(1, sizeof(*hist) + l)))
1775 if (!p->history && !(p->history = ast_calloc(1, sizeof(*p->history)))) {
1779 memcpy(hist->event, buf, l);
1780 AST_LIST_INSERT_TAIL(p->history, hist, list);
1783 /*! \brief Append to SIP dialog history with arg list */
1784 static void append_history_full(struct sip_pvt *p, const char *fmt, ...)
1788 if (!recordhistory || !p)
1791 append_history_va(p, fmt, ap);
1797 /*! \brief Retransmit SIP message if no answer (Called from scheduler) */
1798 static int retrans_pkt(void *data)
1800 struct sip_pkt *pkt = data, *prev, *cur = NULL;
1801 int reschedule = DEFAULT_RETRANS;
1803 /* Lock channel PVT */
1804 ast_mutex_lock(&pkt->owner->lock);
1806 if (pkt->retrans < MAX_RETRANS) {
1808 if (!pkt->timer_t1) { /* Re-schedule using timer_a and timer_t1 */
1809 if (sipdebug && option_debug > 3)
1810 ast_log(LOG_DEBUG, "SIP TIMER: Not rescheduling id #%d:%s (Method %d) (No timer T1)\n", pkt->retransid, sip_methods[pkt->method].text, pkt->method);
1814 if (sipdebug && option_debug > 3)
1815 ast_log(LOG_DEBUG, "SIP TIMER: Rescheduling retransmission #%d (%d) %s - %d\n", pkt->retransid, pkt->retrans, sip_methods[pkt->method].text, pkt->method);
1819 pkt->timer_a = 2 * pkt->timer_a;
1821 /* For non-invites, a maximum of 4 secs */
1822 siptimer_a = pkt->timer_t1 * pkt->timer_a; /* Double each time */
1823 if (pkt->method != SIP_INVITE && siptimer_a > 4000)
1826 /* Reschedule re-transmit */
1827 reschedule = siptimer_a;
1828 if (option_debug > 3)
1829 ast_log(LOG_DEBUG, "** SIP timers: Rescheduling retransmission %d to %d ms (t1 %d ms (Retrans id #%d)) \n", pkt->retrans +1, siptimer_a, pkt->timer_t1, pkt->retransid);
1832 if (sip_debug_test_pvt(pkt->owner)) {
1833 const struct sockaddr_in *dst = sip_real_dst(pkt->owner);
1834 ast_verbose("Retransmitting #%d (%s) to %s:%d:\n%s\n---\n",
1835 pkt->retrans, sip_nat_mode(pkt->owner),
1836 ast_inet_ntoa(dst->sin_addr),
1837 ntohs(dst->sin_port), pkt->data);
1840 append_history(pkt->owner, "ReTx", "%d %s", reschedule, pkt->data);
1841 __sip_xmit(pkt->owner, pkt->data, pkt->packetlen);
1842 ast_mutex_unlock(&pkt->owner->lock);
1845 /* Too many retries */
1846 if (pkt->owner && pkt->method != SIP_OPTIONS) {
1847 if (ast_test_flag(pkt, FLAG_FATAL) || sipdebug) /* Tell us if it's critical or if we're debugging */
1848 ast_log(LOG_WARNING, "Maximum retries exceeded on transmission %s for seqno %d (%s %s)\n", pkt->owner->callid, pkt->seqno, (ast_test_flag(pkt, FLAG_FATAL)) ? "Critical" : "Non-critical", (ast_test_flag(pkt, FLAG_RESPONSE)) ? "Response" : "Request");
1850 if ((pkt->method == SIP_OPTIONS) && sipdebug)
1851 ast_log(LOG_WARNING, "Cancelling retransmit of OPTIONs (call id %s) \n", pkt->owner->callid);
1853 append_history(pkt->owner, "MaxRetries", "%s", (ast_test_flag(pkt, FLAG_FATAL)) ? "(Critical)" : "(Non-critical)");
1855 pkt->retransid = -1;
1857 if (ast_test_flag(pkt, FLAG_FATAL)) {
1858 while(pkt->owner->owner && ast_channel_trylock(pkt->owner->owner)) {
1859 ast_mutex_unlock(&pkt->owner->lock); /* SIP_PVT, not channel */
1861 ast_mutex_lock(&pkt->owner->lock);
1863 if (pkt->owner->owner) {
1864 ast_set_flag(&pkt->owner->flags[0], SIP_ALREADYGONE);
1865 ast_log(LOG_WARNING, "Hanging up call %s - no reply to our critical packet.\n", pkt->owner->callid);
1866 ast_queue_hangup(pkt->owner->owner);
1867 ast_channel_unlock(pkt->owner->owner);
1869 /* If no channel owner, destroy now */
1870 ast_set_flag(&pkt->owner->flags[0], SIP_NEEDDESTROY);
1873 /* In any case, go ahead and remove the packet */
1874 for (prev = NULL, cur = pkt->owner->packets; cur; prev = cur, cur = cur->next) {
1880 prev->next = cur->next;
1882 pkt->owner->packets = cur->next;
1883 ast_mutex_unlock(&pkt->owner->lock);
1887 ast_log(LOG_WARNING, "Weird, couldn't find packet owner!\n");
1889 ast_mutex_unlock(&pkt->owner->lock);
1893 /*! \brief Transmit packet with retransmits
1894 \return 0 on success, -1 on failure to allocate packet
1896 static enum sip_result __sip_reliable_xmit(struct sip_pvt *p, int seqno, int resp, char *data, int len, int fatal, int sipmethod)
1898 struct sip_pkt *pkt;
1899 int siptimer_a = DEFAULT_RETRANS;
1901 if (!(pkt = ast_calloc(1, sizeof(*pkt) + len + 1)))
1903 memcpy(pkt->data, data, len);
1904 pkt->method = sipmethod;
1905 pkt->packetlen = len;
1906 pkt->next = p->packets;
1910 pkt->data[len] = '\0';
1911 pkt->timer_t1 = p->timer_t1; /* Set SIP timer T1 */
1913 ast_set_flag(pkt, FLAG_FATAL);
1915 siptimer_a = pkt->timer_t1 * 2;
1917 /* Schedule retransmission */
1918 pkt->retransid = ast_sched_add_variable(sched, siptimer_a, retrans_pkt, pkt, 1);
1919 if (option_debug > 3 && sipdebug)
1920 ast_log(LOG_DEBUG, "*** SIP TIMER: Initalizing retransmit timer on packet: Id #%d\n", pkt->retransid);
1921 pkt->next = p->packets;
1924 __sip_xmit(pkt->owner, pkt->data, pkt->packetlen); /* Send packet */
1925 if (sipmethod == SIP_INVITE) {
1926 /* Note this is a pending invite */
1927 p->pendinginvite = seqno;
1932 /*! \brief Kill a SIP dialog (called by scheduler) */
1933 static int __sip_autodestruct(void *data)
1935 struct sip_pvt *p = data;
1937 /* If this is a subscription, tell the phone that we got a timeout */
1938 if (p->subscribed) {
1939 p->subscribed = TIMEOUT;
1940 transmit_state_notify(p, AST_EXTENSION_DEACTIVATED, 1); /* Send last notification */
1941 p->subscribed = NONE;
1942 append_history(p, "Subscribestatus", "timeout");
1943 if (option_debug > 2)
1944 ast_log(LOG_DEBUG, "Re-scheduled destruction of SIP subsription %s\n", p->callid ? p->callid : "<unknown>");
1945 return 10000; /* Reschedule this destruction so that we know that it's gone */
1948 /* Reset schedule ID */
1952 ast_log(LOG_DEBUG, "Auto destroying SIP dialog '%s'\n", p->callid);
1953 append_history(p, "AutoDestroy", "%s", p->callid);
1955 ast_log(LOG_WARNING, "Autodestruct on dialog '%s' with owner in place (Method: %s)\n", p->callid, sip_methods[p->method].text);
1956 ast_queue_hangup(p->owner);
1957 } else if (p->refer) {
1958 transmit_request_with_auth(p, SIP_BYE, 0, XMIT_RELIABLE, 1);
1965 /*! \brief Schedule destruction of SIP dialog */
1966 static void sip_scheddestroy(struct sip_pvt *p, int ms)
1969 if (p->timer_t1 == 0)
1970 p->timer_t1 = 500; /* Set timer T1 if not set (RFC 3261) */
1971 ms = p->timer_t1 * 64;
1973 if (sip_debug_test_pvt(p))
1974 ast_verbose("Scheduling destruction of SIP dialog '%s' in %d ms (Method: %s)\n", p->callid, ms, sip_methods[p->method].text);
1976 append_history(p, "SchedDestroy", "%d ms", ms);
1978 if (p->autokillid > -1)
1979 ast_sched_del(sched, p->autokillid);
1980 p->autokillid = ast_sched_add(sched, ms, __sip_autodestruct, p);
1983 /*! \brief Cancel destruction of SIP dialog */
1984 static void sip_cancel_destroy(struct sip_pvt *p)
1986 if (p->autokillid > -1) {
1987 ast_sched_del(sched, p->autokillid);
1988 append_history(p, "CancelDestroy", "");
1993 /*! \brief Acknowledges receipt of a packet and stops retransmission */
1994 static void __sip_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod, int reset)
1996 struct sip_pkt *cur, *prev = NULL;
1998 /* Just in case... */
2002 msg = sip_methods[sipmethod].text;
2004 ast_mutex_lock(&p->lock);
2005 for (cur = p->packets; cur; prev = cur, cur = cur->next) {
2006 if ((cur->seqno == seqno) && ((ast_test_flag(cur, FLAG_RESPONSE)) == resp) &&
2007 ((ast_test_flag(cur, FLAG_RESPONSE)) ||
2008 (!strncasecmp(msg, cur->data, strlen(msg)) && (cur->data[strlen(msg)] < 33)))) {
2009 if (!resp && (seqno == p->pendinginvite)) {
2011 ast_log(LOG_DEBUG, "Acked pending invite %d\n", p->pendinginvite);
2012 p->pendinginvite = 0;
2014 /* this is our baby */
2016 UNLINK(cur, p->packets, prev);
2017 if (cur->retransid > -1) {
2018 if (sipdebug && option_debug > 3)
2019 ast_log(LOG_DEBUG, "** SIP TIMER: Cancelling retransmit of packet (reply received) Retransid #%d\n", cur->retransid);
2020 ast_sched_del(sched, cur->retransid);
2027 ast_mutex_unlock(&p->lock);
2029 ast_log(LOG_DEBUG, "Stopping retransmission on '%s' of %s %d: Match %s\n", p->callid, resp ? "Response" : "Request", seqno, res ? "Not Found" : "Found");
2032 /*! \brief Pretend to ack all packets
2033 * maybe the lock on p is not strictly necessary but there might be a race */
2034 static void __sip_pretend_ack(struct sip_pvt *p)
2036 struct sip_pkt *cur = NULL;
2038 while (p->packets) {
2040 if (cur == p->packets) {
2041 ast_log(LOG_WARNING, "Have a packet that doesn't want to give up! %s\n", sip_methods[cur->method].text);
2045 method = (cur->method) ? cur->method : find_sip_method(cur->data);
2046 __sip_ack(p, cur->seqno, ast_test_flag(cur, FLAG_RESPONSE), method, FALSE);
2050 /*! \brief Acks receipt of packet, keep it around (used for provisional responses) */
2051 static int __sip_semi_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod)
2053 struct sip_pkt *cur;
2056 for (cur = p->packets; cur; cur = cur->next) {
2057 if (cur->seqno == seqno && ast_test_flag(cur, FLAG_RESPONSE) == resp &&
2058 (ast_test_flag(cur, FLAG_RESPONSE) || method_match(sipmethod, cur->data))) {
2059 /* this is our baby */
2060 if (cur->retransid > -1) {
2061 if (option_debug > 3 && sipdebug)
2062 ast_log(LOG_DEBUG, "*** SIP TIMER: Cancelling retransmission #%d - %s (got response)\n", cur->retransid, sip_methods[sipmethod].text);
2063 ast_sched_del(sched, cur->retransid);
2065 cur->retransid = -1;
2071 ast_log(LOG_DEBUG, "(Provisional) Stopping retransmission (but retaining packet) on '%s' %s %d: %s\n", p->callid, resp ? "Response" : "Request", seqno, res ? "Not Found" : "Found");
2076 /*! \brief Copy SIP request, parse it */
2077 static void parse_copy(struct sip_request *dst, const struct sip_request *src)
2079 memset(dst, 0, sizeof(*dst));
2080 memcpy(dst->data, src->data, sizeof(dst->data));
2081 dst->len = src->len;
2085 /*! \brief add a blank line if no body */
2086 static void add_blank(struct sip_request *req)
2089 /* Add extra empty return. add_header() reserves 4 bytes so cannot be truncated */
2090 snprintf(req->data + req->len, sizeof(req->data) - req->len, "\r\n");
2091 req->len += strlen(req->data + req->len);
2095 /*! \brief Transmit response on SIP request*/
2096 static int send_response(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno)
2101 if (sip_debug_test_pvt(p)) {
2102 const struct sockaddr_in *dst = sip_real_dst(p);
2104 ast_verbose("\n<--- %sTransmitting (%s) to %s:%d --->\n%s\n<------------>\n",
2105 reliable ? "Reliably " : "", sip_nat_mode(p),
2106 ast_inet_ntoa(dst->sin_addr),
2107 ntohs(dst->sin_port), req->data);
2109 if (recordhistory) {
2110 struct sip_request tmp;
2111 parse_copy(&tmp, req);
2112 append_history(p, reliable ? "TxRespRel" : "TxResp", "%s / %s - %s", tmp.data, get_header(&tmp, "CSeq"),
2113 (tmp.method == SIP_RESPONSE || tmp.method == SIP_UNKNOWN) ? tmp.rlPart2 : sip_methods[tmp.method].text);
2116 __sip_reliable_xmit(p, seqno, 1, req->data, req->len, (reliable == XMIT_CRITICAL), req->method) :
2117 __sip_xmit(p, req->data, req->len);
2123 /*! \brief Send SIP Request to the other part of the dialogue */
2124 static int send_request(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno)
2129 if (sip_debug_test_pvt(p)) {
2130 if (ast_test_flag(&p->flags[0], SIP_NAT_ROUTE))
2131 ast_verbose("%sTransmitting (NAT) to %s:%d:\n%s\n---\n", reliable ? "Reliably " : "", ast_inet_ntoa(p->recv.sin_addr), ntohs(p->recv.sin_port), req->data);
2133 ast_verbose("%sTransmitting (no NAT) to %s:%d:\n%s\n---\n", reliable ? "Reliably " : "", ast_inet_ntoa(p->sa.sin_addr), ntohs(p->sa.sin_port), req->data);
2135 if (recordhistory) {
2136 struct sip_request tmp;
2137 parse_copy(&tmp, req);
2138 append_history(p, reliable ? "TxReqRel" : "TxReq", "%s / %s - %s", tmp.data, get_header(&tmp, "CSeq"), sip_methods[tmp.method].text);
2141 __sip_reliable_xmit(p, seqno, 0, req->data, req->len, (reliable > 1), req->method) :
2142 __sip_xmit(p, req->data, req->len);
2146 /*! \brief Locate closing quote in a string, skipping escaped quotes.
2147 * optionally with a limit on the search.
2148 * start must be past the first quote.
2150 static const char *find_closing_quote(const char *start, const char *lim)
2152 char last_char = '\0';
2154 for (s = start; *s && s != lim; last_char = *s++) {
2155 if (*s == '"' && last_char != '\\')
2161 /*! \brief Pick out text in brackets from character string
2162 \return pointer to terminated stripped string
2163 \param tmp input string that will be modified
2166 "foo" <bar> valid input, returns bar
2167 foo returns the whole string
2168 < "foo ... > returns the string between brackets
2169 < "foo... bogus (missing closing bracket), returns the whole string
2170 XXX maybe should still skip the opening bracket
2172 static char *get_in_brackets(char *tmp)
2174 const char *parse = tmp;
2175 char *first_bracket;
2178 * Skip any quoted text until we find the part in brackets.
2179 * On any error give up and return the full string.
2181 while ( (first_bracket = strchr(parse, '<')) ) {
2182 char *first_quote = strchr(parse, '"');
2184 if (!first_quote || first_quote > first_bracket)
2185 break; /* no need to look at quoted part */
2186 /* the bracket is within quotes, so ignore it */
2187 parse = find_closing_quote(first_quote + 1, NULL);
2188 if (!*parse) { /* not found, return full string ? */
2189 /* XXX or be robust and return in-bracket part ? */
2190 ast_log(LOG_WARNING, "No closing quote found in '%s'\n", tmp);
2195 if (first_bracket) {
2196 char *second_bracket = strchr(first_bracket + 1, '>');
2197 if (second_bracket) {
2198 *second_bracket = '\0';
2199 tmp = first_bracket + 1;
2201 ast_log(LOG_WARNING, "No closing bracket found in '%s'\n", tmp);
2207 /*! \brief Send SIP MESSAGE text within a call
2208 Called from PBX core sendtext() application */
2209 static int sip_sendtext(struct ast_channel *ast, const char *text)
2211 struct sip_pvt *p = ast->tech_pvt;
2212 int debug = sip_debug_test_pvt(p);
2215 ast_verbose("Sending text %s on %s\n", text, ast->name);
2218 if (ast_strlen_zero(text))
2221 ast_verbose("Really sending text %s on %s\n", text, ast->name);
2222 transmit_message_with_text(p, text);
2226 /*! \brief Update peer object in realtime storage
2227 If the Asterisk system name is set in asterisk.conf, we will use
2228 that name and store that in the "regserver" field in the sippeers
2229 table to facilitate multi-server setups.
2231 static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, const char *username, const char *fullcontact, int expirey)
2234 char ipaddr[INET_ADDRSTRLEN];
2235 char regseconds[20];
2237 char *sysname = ast_config_AST_SYSTEM_NAME;
2238 char *syslabel = NULL;
2240 time_t nowtime = time(NULL) + expirey;
2241 const char *fc = fullcontact ? "fullcontact" : NULL;
2243 snprintf(regseconds, sizeof(regseconds), "%d", (int)nowtime); /* Expiration time */
2244 ast_copy_string(ipaddr, ast_inet_ntoa(sin->sin_addr), sizeof(ipaddr));
2245 snprintf(port, sizeof(port), "%d", ntohs(sin->sin_port));
2247 if (ast_strlen_zero(sysname)) /* No system name, disable this */
2249 else if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTSAVE_SYSNAME))
2250 syslabel = "regserver";
2253 ast_update_realtime("sippeers", "name", peername, "ipaddr", ipaddr,
2254 "port", port, "regseconds", regseconds,
2255 "username", username, fc, fullcontact, syslabel, sysname, NULL); /* note fc and syslabel _can_ be NULL */
2257 ast_update_realtime("sippeers", "name", peername, "ipaddr", ipaddr,
2258 "port", port, "regseconds", regseconds,
2259 "username", username, syslabel, sysname, NULL); /* note syslabel _can_ be NULL */
2262 /*! \brief Automatically add peer extension to dial plan */
2263 static void register_peer_exten(struct sip_peer *peer, int onoff)
2266 char *stringp, *ext, *context;
2268 /* XXX note that global_regcontext is both a global 'enable' flag and
2269 * the name of the global regexten context, if not specified
2272 if (ast_strlen_zero(global_regcontext))
2275 ast_copy_string(multi, S_OR(peer->regexten, peer->name), sizeof(multi));
2277 while ((ext = strsep(&stringp, "&"))) {
2278 if ((context = strchr(ext, '@'))) {
2279 *context++ = '\0'; /* split ext@context */
2280 if (!ast_context_find(context)) {
2281 ast_log(LOG_WARNING, "Context %s must exist in regcontext= in sip.conf!\n", context);
2285 context = global_regcontext;
2288 ast_add_extension(context, 1, ext, 1, NULL, NULL, "Noop",
2289 ast_strdup(peer->name), ast_free, "SIP");
2291 ast_context_remove_extension(context, ext, 1, NULL);
2295 /*! \brief Destroy peer object from memory */
2296 static void sip_destroy_peer(struct sip_peer *peer)
2298 if (option_debug > 2)
2299 ast_log(LOG_DEBUG, "Destroying SIP peer %s\n", peer->name);
2301 /* Delete it, it needs to disappear */
2303 sip_destroy(peer->call);
2305 if (peer->mwipvt) /* We have an active subscription, delete it */
2306 sip_destroy(peer->mwipvt);
2308 if (peer->chanvars) {
2309 ast_variables_destroy(peer->chanvars);
2310 peer->chanvars = NULL;
2312 if (peer->expire > -1)
2313 ast_sched_del(sched, peer->expire);
2314 if (peer->pokeexpire > -1)
2315 ast_sched_del(sched, peer->pokeexpire);
2316 register_peer_exten(peer, FALSE);
2317 ast_free_ha(peer->ha);
2318 if (ast_test_flag(&peer->flags[1], SIP_PAGE2_SELFDESTRUCT))
2320 else if (ast_test_flag(&peer->flags[0], SIP_REALTIME))
2324 clear_realm_authentication(peer->auth);
2327 ast_dnsmgr_release(peer->dnsmgr);
2331 /*! \brief Update peer data in database (if used) */
2332 static void update_peer(struct sip_peer *p, int expiry)
2334 int rtcachefriends = ast_test_flag(&p->flags[1], SIP_PAGE2_RTCACHEFRIENDS);
2335 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTUPDATE) &&
2336 (ast_test_flag(&p->flags[0], SIP_REALTIME) || rtcachefriends)) {
2337 realtime_update_peer(p->name, &p->addr, p->username, rtcachefriends ? p->fullcontact : NULL, expiry);
2342 /*! \brief realtime_peer: Get peer from realtime storage
2343 * Checks the "sippeers" realtime family from extconfig.conf
2344 * \todo Consider adding check of port address when matching here to follow the same
2345 * algorithm as for static peers. Will we break anything by adding that?
2347 static struct sip_peer *realtime_peer(const char *newpeername, struct sockaddr_in *sin)
2349 struct sip_peer *peer;
2350 struct ast_variable *var = NULL;
2351 struct ast_variable *tmp;
2352 char ipaddr[INET_ADDRSTRLEN];
2354 /* First check on peer name */
2356 var = ast_load_realtime("sippeers", "name", newpeername, NULL);
2357 else if (sin) { /* Then check on IP address for dynamic peers */
2358 ast_copy_string(ipaddr, ast_inet_ntoa(sin->sin_addr), sizeof(ipaddr));
2359 var = ast_load_realtime("sippeers", "host", ipaddr, NULL); /* First check for fixed IP hosts */
2361 var = ast_load_realtime("sippeers", "ipaddr", ipaddr, NULL); /* Then check for registred hosts */
2367 for (tmp = var; tmp; tmp = tmp->next) {
2368 /* If this is type=user, then skip this object. */
2369 if (!strcasecmp(tmp->name, "type") &&
2370 !strcasecmp(tmp->value, "user")) {
2371 ast_variables_destroy(var);
2373 } else if (!newpeername && !strcasecmp(tmp->name, "name")) {
2374 newpeername = tmp->value;
2378 if (!newpeername) { /* Did not find peer in realtime */
2379 ast_log(LOG_WARNING, "Cannot Determine peer name ip=%s\n", ipaddr);
2380 ast_variables_destroy(var);
2384 /* Peer found in realtime, now build it in memory */
2385 peer = build_peer(newpeername, var, NULL, !ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS));
2387 ast_variables_destroy(var);
2391 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS)) {
2393 ast_copy_flags(&peer->flags[1],&global_flags[1], SIP_PAGE2_RTAUTOCLEAR|SIP_PAGE2_RTCACHEFRIENDS);
2394 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTAUTOCLEAR)) {
2395 if (peer->expire > -1) {
2396 ast_sched_del(sched, peer->expire);
2398 peer->expire = ast_sched_add(sched, (global_rtautoclear) * 1000, expire_register, (void *)peer);
2400 ASTOBJ_CONTAINER_LINK(&peerl,peer);
2402 ast_set_flag(&peer->flags[0], SIP_REALTIME);
2404 ast_variables_destroy(var);
2409 /*! \brief Support routine for find_peer */
2410 static int sip_addrcmp(char *name, struct sockaddr_in *sin)
2412 /* We know name is the first field, so we can cast */
2413 struct sip_peer *p = (struct sip_peer *) name;
2414 return !(!inaddrcmp(&p->addr, sin) ||
2415 (ast_test_flag(&p->flags[0], SIP_INSECURE_PORT) &&
2416 (p->addr.sin_addr.s_addr == sin->sin_addr.s_addr)));
2419 /*! \brief Locate peer by name or ip address
2420 * This is used on incoming SIP message to find matching peer on ip
2421 or outgoing message to find matching peer on name */
2422 static struct sip_peer *find_peer(const char *peer, struct sockaddr_in *sin, int realtime)
2424 struct sip_peer *p = NULL;
2427 p = ASTOBJ_CONTAINER_FIND(&peerl, peer);
2429 p = ASTOBJ_CONTAINER_FIND_FULL(&peerl, sin, name, sip_addr_hashfunc, 1, sip_addrcmp);
2432 p = realtime_peer(peer, sin);
2437 /*! \brief Remove user object from in-memory storage */
2438 static void sip_destroy_user(struct sip_user *user)
2440 if (option_debug > 2)
2441 ast_log(LOG_DEBUG, "Destroying user object from memory: %s\n", user->name);
2442 ast_free_ha(user->ha);
2443 if (user->chanvars) {
2444 ast_variables_destroy(user->chanvars);
2445 user->chanvars = NULL;
2447 if (ast_test_flag(&user->flags[0], SIP_REALTIME))
2454 /*! \brief Load user from realtime storage
2455 * Loads user from "sipusers" category in realtime (extconfig.conf)
2456 * Users are matched on From: user name (the domain in skipped) */
2457 static struct sip_user *realtime_user(const char *username)
2459 struct ast_variable *var;
2460 struct ast_variable *tmp;
2461 struct sip_user *user = NULL;
2463 var = ast_load_realtime("sipusers", "name", username, NULL);
2468 for (tmp = var; tmp; tmp = tmp->next) {
2469 if (!strcasecmp(tmp->name, "type") &&
2470 !strcasecmp(tmp->value, "peer")) {
2471 ast_variables_destroy(var);
2476 user = build_user(username, var, !ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS));
2478 if (!user) { /* No user found */
2479 ast_variables_destroy(var);
2483 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS)) {
2484 ast_set_flag(&user->flags[1], SIP_PAGE2_RTCACHEFRIENDS);
2486 ASTOBJ_CONTAINER_LINK(&userl,user);
2488 /* Move counter from s to r... */
2491 ast_set_flag(&user->flags[0], SIP_REALTIME);
2493 ast_variables_destroy(var);
2497 /*! \brief Locate user by name
2498 * Locates user by name (From: sip uri user name part) first
2499 * from in-memory list (static configuration) then from
2500 * realtime storage (defined in extconfig.conf) */
2501 static struct sip_user *find_user(const char *name, int realtime)
2503 struct sip_user *u = ASTOBJ_CONTAINER_FIND(&userl, name);
2505 u = realtime_user(name);
2509 /*! \brief Set nat mode on the various data sockets */
2510 static void do_setnat(struct sip_pvt *p, int natflags)
2512 const char *mode = natflags ? "On" : "Off";
2516 ast_log(LOG_DEBUG, "Setting NAT on RTP to %s\n", mode);
2517 ast_rtp_setnat(p->rtp, natflags);
2521 ast_log(LOG_DEBUG, "Setting NAT on VRTP to %s\n", mode);
2522 ast_rtp_setnat(p->vrtp, natflags);
2526 ast_log(LOG_DEBUG, "Setting NAT on UDPTL to %s\n", mode);
2527 ast_udptl_setnat(p->udptl, natflags);
2531 /*! \brief Create address structure from peer reference.
2532 * return -1 on error, 0 on success.
2534 static int create_addr_from_peer(struct sip_pvt *dialog, struct sip_peer *peer)
2536 if ((peer->addr.sin_addr.s_addr || peer->defaddr.sin_addr.s_addr) &&
2537 (!peer->maxms || ((peer->lastms >= 0) && (peer->lastms <= peer->maxms)))) {
2538 dialog->sa = (peer->addr.sin_addr.s_addr) ? peer->addr : peer->defaddr;
2539 dialog->recv = dialog->sa;
2543 ast_copy_flags(&dialog->flags[0], &peer->flags[0], SIP_FLAGS_TO_COPY);
2544 ast_copy_flags(&dialog->flags[1], &peer->flags[1], SIP_PAGE2_FLAGS_TO_COPY);
2545 dialog->capability = peer->capability;
2546 if (!ast_test_flag(&dialog->flags[1], SIP_PAGE2_VIDEOSUPPORT) && dialog->vrtp) {
2547 ast_rtp_destroy(dialog->vrtp);
2548 dialog->vrtp = NULL;
2550 dialog->prefs = peer->prefs;
2551 if (ast_test_flag(&dialog->flags[1], SIP_PAGE2_T38SUPPORT)) {
2552 dialog->t38.capability = global_t38_capability;
2553 if (dialog->udptl) {
2554 if (ast_udptl_get_error_correction_scheme(dialog->udptl) == UDPTL_ERROR_CORRECTION_FEC )
2555 dialog->t38.capability |= T38FAX_UDP_EC_FEC;
2556 else if (ast_udptl_get_error_correction_scheme(dialog->udptl) == UDPTL_ERROR_CORRECTION_REDUNDANCY )
2557 dialog->t38.capability |= T38FAX_UDP_EC_REDUNDANCY;
2558 else if (ast_udptl_get_error_correction_scheme(dialog->udptl) == UDPTL_ERROR_CORRECTION_NONE )
2559 dialog->t38.capability |= T38FAX_UDP_EC_NONE;
2560 dialog->t38.capability |= T38FAX_RATE_MANAGEMENT_TRANSFERED_TCF;
2561 if (option_debug > 1)
2562 ast_log(LOG_DEBUG,"Our T38 capability (%d)\n", dialog->t38.capability);
2564 dialog->t38.jointcapability = dialog->t38.capability;
2565 } else if (dialog->udptl) {
2566 ast_udptl_destroy(dialog->udptl);
2567 dialog->udptl = NULL;
2569 do_setnat(dialog, ast_test_flag(&dialog->flags[0], SIP_NAT) & SIP_NAT_ROUTE );
2572 ast_rtp_setdtmf(dialog->rtp, ast_test_flag(&dialog->flags[0], SIP_DTMF) != SIP_DTMF_INFO);
2573 ast_rtp_setdtmfcompensate(dialog->rtp, ast_test_flag(&dialog->flags[1], SIP_PAGE2_RFC2833_COMPENSATE));
2576 ast_rtp_setdtmf(dialog->vrtp, 0);
2577 ast_rtp_setdtmfcompensate(dialog->vrtp, 0);
2580 /* Set Frame packetization */
2582 ast_rtp_codec_setpref(dialog->rtp, &dialog->prefs);
2583 dialog->autoframing = peer->autoframing;
2585 ast_string_field_set(dialog, peername, peer->username);
2586 ast_string_field_set(dialog, authname, peer->username);
2587 ast_string_field_set(dialog, username, peer->username);
2588 ast_string_field_set(dialog, peersecret, peer->secret);
2589 ast_string_field_set(dialog, peermd5secret, peer->md5secret);
2590 ast_string_field_set(dialog, tohost, peer->tohost);
2591 ast_string_field_set(dialog, fullcontact, peer->fullcontact);
2592 if (!dialog->initreq.headers && !ast_strlen_zero(peer->fromdomain)) {
2595 tmpcall = ast_strdupa(dialog->callid);
2596 c = strchr(tmpcall, '@');
2599 ast_string_field_build(dialog, callid, "%s@%s", tmpcall, peer->fromdomain);
2602 if (ast_strlen_zero(dialog->tohost))
2603 ast_string_field_set(dialog, tohost, ast_inet_ntoa(dialog->sa.sin_addr));
2604 if (!ast_strlen_zero(peer->fromdomain))
2605 ast_string_field_set(dialog, fromdomain, peer->fromdomain);
2606 if (!ast_strlen_zero(peer->fromuser))
2607 ast_string_field_set(dialog, fromuser, peer->fromuser);
2608 dialog->maxtime = peer->maxms;
2609 dialog->callgroup = peer->callgroup;
2610 dialog->pickupgroup = peer->pickupgroup;
2611 dialog->allowtransfer = peer->allowtransfer;
2612 /* Set timer T1 to RTT for this peer (if known by qualify=) */
2613 /* Minimum is settable or default to 100 ms */
2614 if (peer->maxms && peer->lastms)
2615 dialog->timer_t1 = peer->lastms < global_t1min ? global_t1min : peer->lastms;
2616 if ((ast_test_flag(&dialog->flags[0], SIP_DTMF) == SIP_DTMF_RFC2833) ||
2617 (ast_test_flag(&dialog->flags[0], SIP_DTMF) == SIP_DTMF_AUTO))
2618 dialog->noncodeccapability |= AST_RTP_DTMF;
2620 dialog->noncodeccapability &= ~AST_RTP_DTMF;
2621 ast_string_field_set(dialog, context, peer->context);
2622 dialog->rtptimeout = peer->rtptimeout;
2623 dialog->rtpholdtimeout = peer->rtpholdtimeout;
2624 dialog->rtpkeepalive = peer->rtpkeepalive;
2625 if (peer->call_limit)
2626 ast_set_flag(&dialog->flags[0], SIP_CALL_LIMIT);
2627 dialog->maxcallbitrate = peer->maxcallbitrate;
2632 /*! \brief create address structure from peer name
2633 * Or, if peer not found, find it in the global DNS
2634 * returns TRUE (-1) on failure, FALSE on success */
2635 static int create_addr(struct sip_pvt *dialog, const char *opeer)
2638 struct ast_hostent ahp;
2642 char host[MAXHOSTNAMELEN], *hostn;
2645 ast_copy_string(peer, opeer, sizeof(peer));
2646 port = strchr(peer, ':');
2649 dialog->sa.sin_family = AF_INET;
2650 dialog->timer_t1 = 500; /* Default SIP retransmission timer T1 (RFC 3261) */
2651 p = find_peer(peer, NULL, 1);
2654 int res = create_addr_from_peer(dialog, p);
2655 ASTOBJ_UNREF(p, sip_destroy_peer);
2659 portno = port ? atoi(port) : STANDARD_SIP_PORT;
2661 char service[MAXHOSTNAMELEN];
2665 snprintf(service, sizeof(service), "_sip._udp.%s", peer);
2666 ret = ast_get_srv(NULL, host, sizeof(host), &tportno, service);
2672 hp = ast_gethostbyname(hostn, &ahp);
2674 ast_log(LOG_WARNING, "No such host: %s\n", peer);
2677 ast_string_field_set(dialog, tohost, peer);
2678 memcpy(&dialog->sa.sin_addr, hp->h_addr, sizeof(dialog->sa.sin_addr));
2679 dialog->sa.sin_port = htons(portno);
2680 dialog->recv = dialog->sa;
2684 /*! \brief Scheduled congestion on a call */
2685 static int auto_congest(void *nothing)
2687 struct sip_pvt *p = nothing;
2689 ast_mutex_lock(&p->lock);
2692 /* XXX fails on possible deadlock */
2693 if (!ast_channel_trylock(p->owner)) {
2694 ast_log(LOG_NOTICE, "Auto-congesting %s\n", p->owner->name);
2695 append_history(p, "Cong", "Auto-congesting (timer)");
2696 ast_queue_control(p->owner, AST_CONTROL_CONGESTION);
2697 ast_channel_unlock(p->owner);
2700 ast_mutex_unlock(&p->lock);
2705 /*! \brief Initiate SIP call from PBX
2706 * used from the dial() application */
2707 static int sip_call(struct ast_channel *ast, char *dest, int timeout)
2711 struct varshead *headp;
2712 struct ast_var_t *current;
2713 const char *referer = NULL; /* SIP refererer */
2716 if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
2717 ast_log(LOG_WARNING, "sip_call called on %s, neither down nor reserved\n", ast->name);
2721 /* Check whether there is vxml_url, distinctive ring variables */
2722 headp=&ast->varshead;
2723 AST_LIST_TRAVERSE(headp,current,entries) {
2724 /* Check whether there is a VXML_URL variable */
2725 if (!p->options->vxml_url && !strcasecmp(ast_var_name(current), "VXML_URL")) {
2726 p->options->vxml_url = ast_var_value(current);
2727 } else if (!p->options->uri_options && !strcasecmp(ast_var_name(current), "SIP_URI_OPTIONS")) {
2728 p->options->uri_options = ast_var_value(current);
2729 } else if (!p->options->addsipheaders && !strncasecmp(ast_var_name(current), "SIPADDHEADER", strlen("SIPADDHEADER"))) {
2730 /* Check whether there is a variable with a name starting with SIPADDHEADER */
2731 p->options->addsipheaders = 1;
2732 } else if (!strcasecmp(ast_var_name(current), "SIPTRANSFER")) {
2733 /* This is a transfered call */
2734 p->options->transfer = 1;
2735 } else if (!strcasecmp(ast_var_name(current), "SIPTRANSFER_REFERER")) {
2736 /* This is the referer */
2737 referer = ast_var_value(current);
2738 } else if (!strcasecmp(ast_var_name(current), "SIPTRANSFER_REPLACES")) {
2739 /* We're replacing a call. */
2740 p->options->replaces = ast_var_value(current);
2741 } else if (!strcasecmp(ast_var_name(current), "T38CALL")) {
2742 p->t38.state = T38_LOCAL_DIRECT;
2744 ast_log(LOG_DEBUG,"T38State change to %d on channel %s\n", p->t38.state, ast->name);
2750 ast_set_flag(&p->flags[0], SIP_OUTGOING);
2752 if (p->options->transfer) {
2756 if (sipdebug && option_debug > 2)
2757 ast_log(LOG_DEBUG, "Call for %s transfered by %s\n", p->username, referer);
2758 snprintf(buf, sizeof(buf)-1, "-> %s (via %s)", p->cid_name, referer);
2760 snprintf(buf, sizeof(buf)-1, "-> %s", p->cid_name);
2761 ast_string_field_set(p, cid_name, buf);
2764 ast_log(LOG_DEBUG, "Outgoing Call for %s\n", p->username);
2766 res = update_call_counter(p, INC_CALL_RINGING);
2768 p->callingpres = ast->cid.cid_pres;
2769 p->jointcapability = p->capability;
2770 p->t38.jointcapability = p->t38.capability;
2772 ast_log(LOG_DEBUG,"Our T38 capability (%d), joint T38 capability (%d)\n", p->t38.capability, p->t38.jointcapability);
2773 transmit_invite(p, SIP_INVITE, 1, 2);
2775 /* Initialize auto-congest time */
2776 p->initid = ast_sched_add(sched, p->maxtime * 4, auto_congest, p);
2778 p->initid = ast_sched_add(sched, SIP_TRANS_TIMEOUT, auto_congest, p);
2783 /*! \brief Destroy registry object
2784 Objects created with the register= statement in static configuration */
2785 static void sip_registry_destroy(struct sip_registry *reg)
2788 if (option_debug > 2)
2789 ast_log(LOG_DEBUG, "Destroying registry entry for %s@%s\n", reg->username, reg->hostname);
2792 /* Clear registry before destroying to ensure
2793 we don't get reentered trying to grab the registry lock */
2794 reg->call->registry = NULL;
2795 if (option_debug > 2)
2796 ast_log(LOG_DEBUG, "Destroying active SIP dialog for registry %s@%s\n", reg->username, reg->hostname);
2797 sip_destroy(reg->call);
2799 if (reg->expire > -1)
2800 ast_sched_del(sched, reg->expire);
2801 if (reg->timeout > -1)
2802 ast_sched_del(sched, reg->timeout);
2803 ast_string_field_free_all(reg);
2809 /*! \brief Execute destruction of SIP dialog structure, release memory */
2810 static void __sip_destroy(struct sip_pvt *p, int lockowner)
2812 struct sip_pvt *cur, *prev = NULL;
2815 if (sip_debug_test_pvt(p) || option_debug > 2)
2816 ast_verbose("Really destroying SIP dialog '%s' Method: %s\n", p->callid, sip_methods[p->method].text);
2818 /* Remove link from peer to subscription of MWI */
2819 if (p->relatedpeer && p->relatedpeer->mwipvt)
2820 p->relatedpeer->mwipvt = NULL;
2823 sip_dump_history(p);
2828 if (p->stateid > -1)
2829 ast_extension_state_del(p->stateid, NULL);
2831 ast_sched_del(sched, p->initid);
2832 if (p->autokillid > -1)
2833 ast_sched_del(sched, p->autokillid);
2836 ast_rtp_destroy(p->rtp);
2838 ast_rtp_destroy(p->vrtp);
2840 ast_udptl_destroy(p->udptl);
2844 free_old_route(p->route);
2848 if (p->registry->call == p)
2849 p->registry->call = NULL;
2850 ASTOBJ_UNREF(p->registry, sip_registry_destroy);
2853 /* Unlink us from the owner if we have one */
2856 ast_channel_lock(p->owner);
2858 ast_log(LOG_DEBUG, "Detaching from %s\n", p->owner->name);
2859 p->owner->tech_pvt = NULL;
2861 ast_channel_unlock(p->owner);
2865 struct sip_history *hist;
2866 while( (hist = AST_LIST_REMOVE_HEAD(p->history, list)) )
2872 for (prev = NULL, cur = iflist; cur; prev = cur, cur = cur->next) {
2874 UNLINK(cur, iflist, prev);
2879 ast_log(LOG_WARNING, "Trying to destroy \"%s\", not found in dialog list?!?! \n", p->callid);
2883 /* remove all current packets in this dialog */
2884 while((cp = p->packets)) {
2885 p->packets = p->packets->next;
2886 if (cp->retransid > -1)
2887 ast_sched_del(sched, cp->retransid);
2891 ast_variables_destroy(p->chanvars);
2894 ast_mutex_destroy(&p->lock);
2896 ast_string_field_free_all(p);
2901 /*! \brief update_call_counter: Handle call_limit for SIP users
2902 * Setting a call-limit will cause calls above the limit not to be accepted.
2904 * Remember that for a type=friend, there's one limit for the user and
2905 * another for the peer, not a combined call limit.
2906 * This will cause unexpected behaviour in subscriptions, since a "friend"
2907 * is *two* devices in Asterisk, not one.
2909 * Thought: For realtime, we should propably update storage with inuse counter...
2911 * \return 0 if call is ok (no call limit, below treshold)
2912 * -1 on rejection of call
2915 static int update_call_counter(struct sip_pvt *fup, int event)
2918 int *inuse, *call_limit, *inringing;
2919 int outgoing = ast_test_flag(&fup->flags[0], SIP_OUTGOING);
2920 struct sip_user *u = NULL;
2921 struct sip_peer *p = NULL;
2923 if (option_debug > 2)
2924 ast_log(LOG_DEBUG, "Updating call counter for %s call\n", outgoing ? "outgoing" : "incoming");
2925 /* Test if we need to check call limits, in order to avoid
2926 realtime lookups if we do not need it */
2927 if (!ast_test_flag(&fup->flags[0], SIP_CALL_LIMIT))
2930 ast_copy_string(name, fup->username, sizeof(name));
2932 /* Check the list of users only for incoming calls */
2933 if (!outgoing && (u = find_user(name, 1)) ) {
2935 call_limit = &u->call_limit;
2937 } else if ( (p = find_peer(fup->peername, NULL, 1) ) ) { /* Try to find peer */
2939 call_limit = &p->call_limit;
2940 inringing = &p->inRinging;
2941 ast_copy_string(name, fup->peername, sizeof(name));
2943 if (option_debug > 1)
2944 ast_log(LOG_DEBUG, "%s is not a local device, no call limit\n", name);
2949 /* incoming and outgoing affects the inUse counter */
2950 case DEC_CALL_LIMIT:
2952 if (ast_test_flag(&fup->flags[0], SIP_INC_COUNT))
2958 if (ast_test_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING)) {
2962 ast_log(LOG_WARNING, "Inringing for peer '%s' < 0?\n", fup->peername);
2963 ast_clear_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING);
2966 if (option_debug > 1 || sipdebug) {
2967 ast_log(LOG_DEBUG, "Call %s %s '%s' removed from call limit %d\n", outgoing ? "to" : "from", u ? "user":"peer", name, *call_limit);
2971 case INC_CALL_RINGING:
2972 case INC_CALL_LIMIT:
2973 if (*call_limit > 0 ) {
2974 if (*inuse >= *call_limit) {
2975 ast_log(LOG_ERROR, "Call %s %s '%s' rejected due to usage limit of %d\n", outgoing ? "to" : "from", u ? "user":"peer", name, *call_limit);
2977 ASTOBJ_UNREF(u, sip_destroy_user);
2979 ASTOBJ_UNREF(p, sip_destroy_peer);
2983 if (inringing && (event == INC_CALL_RINGING)) {
2984 if (!ast_test_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING)) {
2986 ast_set_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING);
2991 ast_set_flag(&fup->flags[0], SIP_INC_COUNT);
2992 if (option_debug > 1 || sipdebug) {
2993 ast_log(LOG_DEBUG, "Call %s %s '%s' is %d out of %d\n", outgoing ? "to" : "from", u ? "user":"peer", name, *inuse, *call_limit);
2997 case DEC_CALL_RINGING:
2999 if (ast_test_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING)) {
3003 ast_log(LOG_WARNING, "Inringing for peer '%s' < 0?\n", p->name);
3004 ast_clear_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING);
3010 ast_log(LOG_ERROR, "update_call_counter(%s, %d) called with no event!\n", name, event);
3013 ast_device_state_changed("SIP/%s", p->name);
3014 ASTOBJ_UNREF(p, sip_destroy_peer);
3015 } else /* u must be set */
3016 ASTOBJ_UNREF(u, sip_destroy_user);
3020 /*! \brief Destroy SIP call structure */
3021 static void sip_destroy(struct sip_pvt *p)
3023 ast_mutex_lock(&iflock);
3024 if (option_debug > 2)
3025 ast_log(LOG_DEBUG, "Destroying SIP dialog %s\n", p->callid);
3026 __sip_destroy(p, 1);
3027 ast_mutex_unlock(&iflock);
3030 /*! \brief Convert SIP hangup causes to Asterisk hangup causes */
3031 static int hangup_sip2cause(int cause)
3033 /* Possible values taken from causes.h */
3036 case 401: /* Unauthorized */
3037 return AST_CAUSE_CALL_REJECTED;
3038 case 403: /* Not found */
3039 return AST_CAUSE_CALL_REJECTED;
3040 case 404: /* Not found */
3041 return AST_CAUSE_UNALLOCATED;
3042 case 405: /* Method not allowed */
3043 return AST_CAUSE_INTERWORKING;
3044 case 407: /* Proxy authentication required */
3045 return AST_CAUSE_CALL_REJECTED;
3046 case 408: /* No reaction */
3047 return AST_CAUSE_NO_USER_RESPONSE;
3048 case 409: /* Conflict */
3049 return AST_CAUSE_NORMAL_TEMPORARY_FAILURE;
3050 case 410: /* Gone */
3051 return AST_CAUSE_UNALLOCATED;
3052 case 411: /* Length required */
3053 return AST_CAUSE_INTERWORKING;
3054 case 413: /* Request entity too large */
3055 return AST_CAUSE_INTERWORKING;
3056 case 414: /* Request URI too large */
3057 return AST_CAUSE_INTERWORKING;
3058 case 415: /* Unsupported media type */
3059 return AST_CAUSE_INTERWORKING;
3060 case 420: /* Bad extension */
3061 return AST_CAUSE_NO_ROUTE_DESTINATION;
3062 case 480: /* No answer */
3063 return AST_CAUSE_NO_ANSWER;
3064 case 481: /* No answer */
3065 return AST_CAUSE_INTERWORKING;
3066 case 482: /* Loop detected */
3067 return AST_CAUSE_INTERWORKING;
3068 case 483: /* Too many hops */
3069 return AST_CAUSE_NO_ANSWER;
3070 case 484: /* Address incomplete */
3071 return AST_CAUSE_INVALID_NUMBER_FORMAT;
3072 case 485: /* Ambigous */
3073 return AST_CAUSE_UNALLOCATED;
3074 case 486: /* Busy everywhere */
3075 return AST_CAUSE_BUSY;
3076 case 487: /* Request terminated */
3077 return AST_CAUSE_INTERWORKING;
3078 case 488: /* No codecs approved */
3079 return AST_CAUSE_BEARERCAPABILITY_NOTAVAIL;
3080 case 491: /* Request pending */
3081 return AST_CAUSE_INTERWORKING;
3082 case 493: /* Undecipherable */
3083 return AST_CAUSE_INTERWORKING;
3084 case 500: /* Server internal failure */
3085 return AST_CAUSE_FAILURE;
3086 case 501: /* Call rejected */
3087 return AST_CAUSE_FACILITY_REJECTED;
3089 return AST_CAUSE_DESTINATION_OUT_OF_ORDER;
3090 case 503: /* Service unavailable */
3091 return AST_CAUSE_CONGESTION;
3092 case 504: /* Gateway timeout */
3093 return AST_CAUSE_RECOVERY_ON_TIMER_EXPIRE;
3094 case 505: /* SIP version not supported */
3095 return AST_CAUSE_INTERWORKING;
3096 case 600: /* Busy everywhere */
3097 return AST_CAUSE_USER_BUSY;
3098 case 603: /* Decline */
3099 return AST_CAUSE_CALL_REJECTED;
3100 case 604: /* Does not exist anywhere */
3101 return AST_CAUSE_UNALLOCATED;
3102 case 606: /* Not acceptable */
3103 return AST_CAUSE_BEARERCAPABILITY_NOTAVAIL;
3105 return AST_CAUSE_NORMAL;
3111 /*! \brief Convert Asterisk hangup causes to SIP codes
3113 Possible values from causes.h
3114 AST_CAUSE_NOTDEFINED AST_CAUSE_NORMAL AST_CAUSE_BUSY
3115 AST_CAUSE_FAILURE AST_CAUSE_CONGESTION AST_CAUSE_UNALLOCATED
3117 In addition to these, a lot of PRI codes is defined in causes.h
3118 ...should we take care of them too ?
3122 ISUP Cause value SIP response
3123 ---------------- ------------
3124 1 unallocated number 404 Not Found
3125 2 no route to network 404 Not found
3126 3 no route to destination 404 Not found
3127 16 normal call clearing --- (*)
3128 17 user busy 486 Busy here
3129 18 no user responding 408 Request Timeout
3130 19 no answer from the user 480 Temporarily unavailable
3131 20 subscriber absent 480 Temporarily unavailable
3132 21 call rejected 403 Forbidden (+)
3133 22 number changed (w/o diagnostic) 410 Gone
3134 22 number changed (w/ diagnostic) 301 Moved Permanently
3135 23 redirection to new destination 410 Gone
3136 26 non-selected user clearing 404 Not Found (=)
3137 27 destination out of order 502 Bad Gateway
3138 28 address incomplete 484 Address incomplete
3139 29 facility rejected 501 Not implemented
3140 31 normal unspecified 480 Temporarily unavailable
3143 static const char *hangup_cause2sip(int cause)
3146 case AST_CAUSE_UNALLOCATED: /* 1 */
3147 case AST_CAUSE_NO_ROUTE_DESTINATION: /* 3 IAX2: Can't find extension in context */
3148 case AST_CAUSE_NO_ROUTE_TRANSIT_NET: /* 2 */
3149 return "404 Not Found";
3150 case AST_CAUSE_CONGESTION: /* 34 */
3151 case AST_CAUSE_SWITCH_CONGESTION: /* 42 */
3152 return "503 Service Unavailable";
3153 case AST_CAUSE_NO_USER_RESPONSE: /* 18 */
3154 return "408 Request Timeout";
3155 case AST_CAUSE_NO_ANSWER: /* 19 */
3156 return "480 Temporarily unavailable";
3157 case AST_CAUSE_CALL_REJECTED: /* 21 */
3158 return "403 Forbidden";
3159 case AST_CAUSE_NUMBER_CHANGED: /* 22 */
3161 case AST_CAUSE_NORMAL_UNSPECIFIED: /* 31 */
3162 return "480 Temporarily unavailable";
3163 case AST_CAUSE_INVALID_NUMBER_FORMAT:
3164 return "484 Address incomplete";
3165 case AST_CAUSE_USER_BUSY:
3166 return "486 Busy here";
3167 case AST_CAUSE_FAILURE:
3168 return "500 Server internal failure";
3169 case AST_CAUSE_FACILITY_REJECTED: /* 29 */
3170 return "501 Not Implemented";
3171 case AST_CAUSE_CHAN_NOT_IMPLEMENTED:
3172 return "503 Service Unavailable";
3173 /* Used in chan_iax2 */
3174 case AST_CAUSE_DESTINATION_OUT_OF_ORDER:
3175 return "502 Bad Gateway";
3176 case AST_CAUSE_BEARERCAPABILITY_NOTAVAIL: /* Can't find codec to connect to host */
3177 return "488 Not Acceptable Here";
3179 case AST_CAUSE_NOTDEFINED:
3182 ast_log(LOG_DEBUG, "AST hangup cause %d (no match found in SIP)\n", cause);
3191 /*! \brief sip_hangup: Hangup SIP call
3192 * Part of PBX interface, called from ast_hangup */
3193 static int sip_hangup(struct ast_channel *ast)
3195 struct sip_pvt *p = ast->tech_pvt;
3196 int needcancel = FALSE;
3197 int needdestroy = 0;
3198 struct ast_channel *oldowner = ast;
3202 ast_log(LOG_DEBUG, "Asked to hangup channel that was not connected\n");
3206 if (ast_test_flag(&p->flags[0], SIP_DEFER_BYE_ON_TRANSFER)) {
3207 if (option_debug >3)
3208 ast_log(LOG_DEBUG, "SIP Transfer: Not hanging up right now... Rescheduling hangup for %s.\n", p->callid);
3209 if (p->autokillid > -1)
3210 sip_cancel_destroy(p);
3211 sip_scheddestroy(p, DEFAULT_TRANS_TIMEOUT);
3212 ast_clear_flag(&p->flags[0], SIP_DEFER_BYE_ON_TRANSFER); /* Really hang up next time */
3213 ast_clear_flag(&p->flags[0], SIP_NEEDDESTROY);
3214 p->owner->tech_pvt = NULL;
3215 p->owner = NULL; /* Owner will be gone after we return, so take it away */
3219 if (ast_test_flag(ast, AST_FLAG_ZOMBIE) && p->refer && option_debug)
3220 ast_log(LOG_DEBUG, "SIP Transfer: Hanging up Zombie channel %s after transfer ... Call-ID: %s\n", ast->name, p->callid);
3223 ast_log(LOG_DEBUG, "Hangup call %s, SIP callid %s)\n", ast->name, p->callid);
3226 if (option_debug && ast_test_flag(ast, AST_FLAG_ZOMBIE))
3227 ast_log(LOG_DEBUG, "Hanging up zombie call. Be scared.\n");
3229 ast_mutex_lock(&p->lock);
3230 if (option_debug && sipdebug)
3231 ast_log(LOG_DEBUG, "update_call_counter(%s) - decrement call limit counter on hangup\n", p->username);
3232 update_call_counter(p, DEC_CALL_LIMIT);
3234 /* Determine how to disconnect */
3235 if (p->owner != ast) {
3236 ast_log(LOG_WARNING, "Huh? We aren't the owner? Can't hangup call.\n");
3237 ast_mutex_unlock(&p->lock);
3240 /* If the call is not UP, we need to send CANCEL instead of BYE */
3241 if (ast->_state == AST_STATE_RING || ast->_state == AST_STATE_RINGING) {
3243 if (option_debug > 3)
3244 ast_log(LOG_DEBUG, "Hanging up channel in state %s (not UP)\n", ast_state2str(ast->_state));
3249 ast_dsp_free(p->vad);
3252 ast->tech_pvt = NULL;
3254 ast_atomic_fetchadd_int(&usecnt, -1);
3255 ast_update_use_count();
3257 /* Do not destroy this pvt until we have timeout or
3258 get an answer to the BYE or INVITE/CANCEL
3259 If we get no answer during retransmit period, drop the call anyway.
3260 (Sorry, mother-in-law, you can't deny a hangup by sending
3261 603 declined to BYE...)
3263 if (ast_test_flag(&p->flags[0], SIP_ALREADYGONE))
3264 needdestroy = 1; /* Set destroy flag at end of this function */
3266 sip_scheddestroy(p, DEFAULT_TRANS_TIMEOUT);
3268 /* Start the process if it's not already started */
3269 if (!ast_test_flag(&p->flags[0], SIP_ALREADYGONE) && !ast_strlen_zero(p->initreq.data)) {
3270 if (needcancel) { /* Outgoing call, not up */
3271 if (ast_test_flag(&p->flags[0], SIP_OUTGOING)) {
3272 /* stop retransmitting an INVITE that has not received a response */
3273 __sip_pretend_ack(p);
3275 /* if we can't send right now, mark it pending */
3276 if (!ast_test_flag(&p->flags[0], SIP_CAN_BYE)) {
3277 ast_set_flag(&p->flags[0], SIP_PENDINGBYE);
3278 /* Do we need a timer here if we don't hear from them at all? */
3280 /* Send a new request: CANCEL */
3281 transmit_request_with_auth(p, SIP_CANCEL, p->ocseq, XMIT_RELIABLE, FALSE);
3282 /* Actually don't destroy us yet, wait for the 487 on our original
3283 INVITE, but do set an autodestruct just in case we never get it. */
3285 sip_scheddestroy(p, DEFAULT_TRANS_TIMEOUT);
3287 if ( p->initid != -1 ) {
3288 /* channel still up - reverse dec of inUse counter
3289 only if the channel is not auto-congested */
3290 update_call_counter(p, INC_CALL_LIMIT);
3292 } else { /* Incoming call, not up */
3294 if (ast->hangupcause && (res = hangup_cause2sip(ast->hangupcause)))
3295 transmit_response_reliable(p, res, &p->initreq);
3297 transmit_response_reliable(p, "603 Declined", &p->initreq);
3299 } else { /* Call is in UP state, send BYE */
3300 if (!p->pendinginvite) {
3301 char *audioqos = "";
3302 char *videoqos = "";
3304 audioqos = ast_rtp_get_quality(p->rtp);
3306 videoqos = ast_rtp_get_quality(p->vrtp);
3308 transmit_request_with_auth(p, SIP_BYE, 0, XMIT_RELIABLE, 1);
3310 /* Get RTCP quality before end of call */
3311 if (recordhistory) {
3313 append_history(p, "RTCPaudio", "Quality:%s", audioqos);
3315 append_history(p, "RTCPvideo", "Quality:%s", videoqos);
3317 if (p->rtp && oldowner)
3318 pbx_builtin_setvar_helper(oldowner, "RTPAUDIOQOS", audioqos);
3319 if (p->vrtp && oldowner)
3320 pbx_builtin_setvar_helper(oldowner, "RTPVIDEOQOS", videoqos);
3322 /* Note we will need a BYE when this all settles out
3323 but we can't send one while we have "INVITE" outstanding. */
3324 ast_set_flag(&p->flags[0], SIP_PENDINGBYE);
3325 ast_clear_flag(&p->flags[0], SIP_NEEDREINVITE);
3330 ast_set_flag(&p->flags[0], SIP_NEEDDESTROY);
3331 ast_mutex_unlock(&p->lock);
3335 /*! \brief Try setting codec suggested by the SIP_CODEC channel variable */
3336 static void try_suggested_sip_codec(struct sip_pvt *p)
3341 codec = pbx_builtin_getvar_helper(p->owner, "SIP_CODEC");
3345 fmt = ast_getformatbyname(codec);
3347 ast_log(LOG_NOTICE, "Changing codec to '%s' for this call because of ${SIP_CODEC} variable\n", codec);
3348 if (p->jointcapability & fmt) {
3349 p->jointcapability &= fmt;
3350 p->capability &= fmt;
3352 ast_log(LOG_NOTICE, "Ignoring ${SIP_CODEC} variable because it is not shared by both ends.\n");
3354 ast_log(LOG_NOTICE, "Ignoring ${SIP_CODEC} variable because of unrecognized/not configured codec (check allow/disallow in sip.conf): %s\n", codec);
3358 /*! \brief sip_answer: Answer SIP call , send 200 OK on Invite
3359 * Part of PBX interface */
3360 static int sip_answer(struct ast_channel *ast)
3363 struct sip_pvt *p = ast->tech_pvt;
3365 ast_mutex_lock(&p->lock);
3366 if (ast->_state != AST_STATE_UP) {
3367 try_suggested_sip_codec(p);
3369 ast_setstate(ast, AST_STATE_UP);
3371 ast_log(LOG_DEBUG, "SIP answering channel: %s\n", ast->name);
3372 if (p->t38.state == T38_PEER_DIRECT) {
3373 p->t38.state = T38_ENABLED;
3374 if (option_debug > 1)
3375 ast_log(LOG_DEBUG,"T38State change to %d on channel %s\n", p->t38.state, ast->name);
3376 res = transmit_response_with_t38_sdp(p, "200 OK", &p->initreq, XMIT_CRITICAL);
3378 res = transmit_response_with_sdp(p, "200 OK", &p->initreq, XMIT_CRITICAL);
3380 ast_mutex_unlock(&p->lock);
3384 /*! \brief Send frame to media channel (rtp) */
3385 static int sip_write(struct ast_channel *ast, struct ast_frame *frame)
3387 struct sip_pvt *p = ast->tech_pvt;
3390 switch (frame->frametype) {
3391 case AST_FRAME_VOICE:
3392 if (!(frame->subclass & ast->nativeformats)) {
3393 char s1[512], s2[512], s3[512];
3394 ast_log(LOG_WARNING, "Asked to transmit frame type %d, while native formats is %s(%d) read/write = %s(%d)/%s(%d)\n",
3396 ast_getformatname_multiple(s1, sizeof(s1) - 1, ast->nativeformats & AST_FORMAT_AUDIO_MASK),
3397 ast->nativeformats & AST_FORMAT_AUDIO_MASK,
3398 ast_getformatname_multiple(s2, sizeof(s2) - 1, ast->readformat),
3400 ast_getformatname_multiple(s3, sizeof(s3) - 1, ast->writeformat),
3405 ast_mutex_lock(&p->lock);
3407 /* If channel is not up, activate early media session */
3408 if ((ast->_state != AST_STATE_UP) &&
3409 !ast_test_flag(&p->flags[0], SIP_PROGRESS_SENT) &&
3410 !ast_test_flag(&p->flags[0], SIP_OUTGOING)) {
3411 transmit_response_with_sdp(p, "183 Session Progress", &p->initreq, XMIT_UNRELIABLE);
3412 ast_set_flag(&p->flags[0], SIP_PROGRESS_SENT);
3414 p->lastrtptx = time(NULL);
3415 res = ast_rtp_write(p->rtp, frame);
3417 ast_mutex_unlock(&p->lock);
3420 case AST_FRAME_VIDEO:
3422 ast_mutex_lock(&p->lock);
3424 /* Activate video early media */
3425 if ((ast->_state != AST_STATE_UP) &&
3426 !ast_test_flag(&p->flags[0], SIP_PROGRESS_SENT) &&
3427 !ast_test_flag(&p->flags[0], SIP_OUTGOING)) {
3428 transmit_response_with_sdp(p, "183 Session Progress", &p->initreq, XMIT_UNRELIABLE);
3429 ast_set_flag(&p->flags[0], SIP_PROGRESS_SENT);
3431 p->lastrtptx = time(NULL);
3432 res = ast_rtp_write(p->vrtp, frame);
3434 ast_mutex_unlock(&p->lock);
3437 case AST_FRAME_IMAGE:
3440 case AST_FRAME_MODEM:
3442 ast_mutex_lock(&p->lock);