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
89 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
95 #include <sys/socket.h>
96 #include <sys/ioctl.h>
103 #include <sys/signal.h>
104 #include <netinet/in.h>
105 #include <netinet/in_systm.h>
106 #include <arpa/inet.h>
107 #include <netinet/ip.h>
110 #include "asterisk/lock.h"
111 #include "asterisk/channel.h"
112 #include "asterisk/config.h"
113 #include "asterisk/logger.h"
114 #include "asterisk/module.h"
115 #include "asterisk/pbx.h"
116 #include "asterisk/options.h"
117 #include "asterisk/lock.h"
118 #include "asterisk/sched.h"
119 #include "asterisk/io.h"
120 #include "asterisk/rtp.h"
121 #include "asterisk/udptl.h"
122 #include "asterisk/acl.h"
123 #include "asterisk/manager.h"
124 #include "asterisk/callerid.h"
125 #include "asterisk/cli.h"
126 #include "asterisk/app.h"
127 #include "asterisk/musiconhold.h"
128 #include "asterisk/dsp.h"
129 #include "asterisk/features.h"
130 #include "asterisk/acl.h"
131 #include "asterisk/srv.h"
132 #include "asterisk/astdb.h"
133 #include "asterisk/causes.h"
134 #include "asterisk/utils.h"
135 #include "asterisk/file.h"
136 #include "asterisk/astobj.h"
137 #include "asterisk/dnsmgr.h"
138 #include "asterisk/devicestate.h"
139 #include "asterisk/linkedlists.h"
140 #include "asterisk/stringfields.h"
141 #include "asterisk/monitor.h"
142 #include "asterisk/localtime.h"
143 #include "asterisk/abstract_jb.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 MAX_AUTHTRIES 3 /*!< Try authentication three times, then fail */
201 #define SIP_MAX_HEADERS 64 /*!< Max amount of SIP headers to read */
202 #define SIP_MAX_LINES 64 /*!< Max amount of lines in SIP attachment (like SDP) */
203 #define SIP_MAX_PACKET 4096 /*!< Also from RFC 3261 (2543), should sub headers tho */
205 #define INITIAL_CSEQ 101 /*!< our initial sip sequence number */
207 /*! \brief Global jitterbuffer configuration - by default, jb is disabled */
208 static struct ast_jb_conf default_jbconf =
212 .resync_threshold = -1,
215 static struct ast_jb_conf global_jbconf;
217 static const char tdesc[] = "Session Initiation Protocol (SIP)";
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 /* IETF draft: draft-ietf-sipping-dialog-package-05.txt */
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 /* 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)
392 /*! \brief List of well-known SIP options. If we get this in a require,
393 we should check the list and answer accordingly. */
394 static const struct cfsip_options {
395 int id; /*!< Bitmap ID */
396 int supported; /*!< Supported by Asterisk ? */
397 char * const text; /*!< Text id, as in standard */
398 } sip_options[] = { /* XXX used in 3 places */
399 /* Replaces: header for transfer */
400 { SIP_OPT_REPLACES, SUPPORTED, "replaces" },
401 /* One version of Polycom firmware has the wrong label */
402 { SIP_OPT_REPLACES, SUPPORTED, "replace" },
403 /* RFC3262: PRACK 100% reliability */
404 { SIP_OPT_100REL, NOT_SUPPORTED, "100rel" },
405 /* SIP Session Timers */
406 { SIP_OPT_TIMER, NOT_SUPPORTED, "timer" },
407 /* RFC3959: SIP Early session support */
408 { SIP_OPT_EARLY_SESSION, NOT_SUPPORTED, "early-session" },
409 /* SIP Join header support */
410 { SIP_OPT_JOIN, NOT_SUPPORTED, "join" },
411 /* RFC3327: Path support */
412 { SIP_OPT_PATH, NOT_SUPPORTED, "path" },
413 /* RFC3840: Callee preferences */
414 { SIP_OPT_PREF, NOT_SUPPORTED, "pref" },
415 /* RFC3312: Precondition support */
416 { SIP_OPT_PRECONDITION, NOT_SUPPORTED, "precondition" },
417 /* RFC3323: Privacy with proxies*/
418 { SIP_OPT_PRIVACY, NOT_SUPPORTED, "privacy" },
419 /* RFC4092: Usage of the SDP ANAT Semantics in the SIP */
420 { SIP_OPT_SDP_ANAT, NOT_SUPPORTED, "sdp-anat" },
421 /* RFC3329: Security agreement mechanism */
422 { SIP_OPT_SEC_AGREE, NOT_SUPPORTED, "sec_agree" },
423 /* SIMPLE events: draft-ietf-simple-event-list-07.txt */
424 { SIP_OPT_EVENTLIST, NOT_SUPPORTED, "eventlist" },
425 /* GRUU: Globally Routable User Agent URI's */
426 { SIP_OPT_GRUU, NOT_SUPPORTED, "gruu" },
427 /* Target-dialog: draft-ietf-sip-target-dialog-00.txt */
428 { SIP_OPT_TARGET_DIALOG,NOT_SUPPORTED, "target-dialog" },
432 /*! \brief SIP Methods we support */
433 #define ALLOWED_METHODS "INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY"
435 /*! \brief SIP Extensions we support */
436 #define SUPPORTED_EXTENSIONS "replaces"
439 /* Default values, set and reset in reload_config before reading configuration */
440 /* These are default values in the source. There are other recommended values in the
441 sip.conf.sample for new installations. These may differ to keep backwards compatibility,
442 yet encouraging new behaviour on new installations
444 #define DEFAULT_SIP_PORT 5060 /*!< From RFC 3261 (former 2543) */
445 #define DEFAULT_CONTEXT "default"
446 #define DEFAULT_MUSICCLASS "default"
447 #define DEFAULT_VMEXTEN "asterisk"
448 #define DEFAULT_CALLERID "asterisk"
449 #define DEFAULT_NOTIFYMIME "application/simple-message-summary"
450 #define DEFAULT_MWITIME 10
451 #define DEFAULT_ALLOWGUEST TRUE
452 #define DEFAULT_SRVLOOKUP FALSE /*!< Recommended setting is ON */
453 #define DEFAULT_COMPACTHEADERS FALSE
454 #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. */
455 #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. */
456 #define DEFAULT_TOS_VIDEO 0 /*!< Video packets should be marked as DSCP AF41, but the default is 0 to be compatible with previous versions. */
457 #define DEFAULT_ALLOW_EXT_DOM TRUE
458 #define DEFAULT_REALM "asterisk"
459 #define DEFAULT_NOTIFYRINGING TRUE
460 #define DEFAULT_PEDANTIC FALSE
461 #define DEFAULT_AUTOCREATEPEER FALSE
462 #define DEFAULT_QUALIFY FALSE
463 #define DEFAULT_T1MIN 100 /*!< 100 MS for minimal roundtrip time */
464 #define DEFAULT_MAX_CALL_BITRATE (384) /*!< Max bitrate for video */
465 #ifndef DEFAULT_USERAGENT
466 #define DEFAULT_USERAGENT "Asterisk PBX" /*!< Default Useragent: header unless re-defined in sip.conf */
470 /* Default setttings are used as a channel setting and as a default when
471 configuring devices */
472 static char default_context[AST_MAX_CONTEXT];
473 static char default_subscribecontext[AST_MAX_CONTEXT];
474 static char default_language[MAX_LANGUAGE];
475 static char default_callerid[AST_MAX_EXTENSION];
476 static char default_fromdomain[AST_MAX_EXTENSION];
477 static char default_notifymime[AST_MAX_EXTENSION];
478 static int default_qualify; /*!< Default Qualify= setting */
479 static char default_vmexten[AST_MAX_EXTENSION];
480 static char default_musicclass[MAX_MUSICCLASS]; /*!< Global music on hold class */
481 static int default_maxcallbitrate; /*!< Maximum bitrate for call */
482 static struct ast_codec_pref default_prefs; /*!< Default codec prefs */
484 /* Global settings only apply to the channel */
485 static int global_rtautoclear;
486 static int global_notifyringing; /*!< Send notifications on ringing */
487 static int global_alwaysauthreject; /*!< Send 401 Unauthorized for all failing requests */
488 static int srvlookup; /*!< SRV Lookup on or off. Default is off, RFC behavior is on */
489 static int pedanticsipchecking; /*!< Extra checking ? Default off */
490 static int autocreatepeer; /*!< Auto creation of peers at registration? Default off. */
491 static int global_relaxdtmf; /*!< Relax DTMF */
492 static int global_rtptimeout; /*!< Time out call if no RTP */
493 static int global_rtpholdtimeout;
494 static int global_rtpkeepalive; /*!< Send RTP keepalives */
495 static int global_reg_timeout;
496 static int global_regattempts_max; /*!< Registration attempts before giving up */
497 static int global_allowguest; /*!< allow unauthenticated users/peers to connect? */
498 static int global_allowsubscribe; /*!< Flag for disabling ALL subscriptions, this is FALSE only if all peers are FALSE
499 the global setting is in globals_flags[1] */
500 static int global_mwitime; /*!< Time between MWI checks for peers */
501 static int global_tos_sip; /*!< IP type of service for SIP packets */
502 static int global_tos_audio; /*!< IP type of service for audio RTP packets */
503 static int global_tos_video; /*!< IP type of service for video RTP packets */
504 static int compactheaders; /*!< send compact sip headers */
505 static int recordhistory; /*!< Record SIP history. Off by default */
506 static int dumphistory; /*!< Dump history to verbose before destroying SIP dialog */
507 static char global_realm[MAXHOSTNAMELEN]; /*!< Default realm */
508 static char global_regcontext[AST_MAX_CONTEXT]; /*!< Context for auto-extensions */
509 static char global_useragent[AST_MAX_EXTENSION]; /*!< Useragent for the SIP channel */
510 static int allow_external_domains; /*!< Accept calls to external SIP domains? */
511 static int global_callevents; /*!< Whether we send manager events or not */
512 static int global_t1min; /*!< T1 roundtrip time minimum */
513 static enum transfermodes global_allowtransfer; /*!< SIP Refer restriction scheme */
515 /*! \brief Codecs that we support by default: */
516 static int global_capability = AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_GSM | AST_FORMAT_H263;
517 static int noncodeccapability = AST_RTP_DTMF;
519 /* Object counters */
520 static int suserobjs = 0; /*!< Static users */
521 static int ruserobjs = 0; /*!< Realtime users */
522 static int speerobjs = 0; /*!< Statis peers */
523 static int rpeerobjs = 0; /*!< Realtime peers */
524 static int apeerobjs = 0; /*!< Autocreated peer objects */
525 static int regobjs = 0; /*!< Registry objects */
527 static struct ast_flags global_flags[2] = {{0}}; /*!< global SIP_ flags */
529 AST_MUTEX_DEFINE_STATIC(usecnt_lock);
531 /*! \brief Protect the SIP dialog list (of sip_pvt's) */
532 AST_MUTEX_DEFINE_STATIC(iflock);
534 /*! \brief Protect the monitoring thread, so only one process can kill or start it, and not
535 when it's doing something critical. */
536 AST_MUTEX_DEFINE_STATIC(netlock);
538 AST_MUTEX_DEFINE_STATIC(monlock);
540 AST_MUTEX_DEFINE_STATIC(sip_reload_lock);
542 /*! \brief This is the thread for the monitor which checks for input on the channels
543 which are not currently in use. */
544 static pthread_t monitor_thread = AST_PTHREADT_NULL;
546 static int sip_reloading = FALSE; /*!< Flag for avoiding multiple reloads at the same time */
547 static enum channelreloadreason sip_reloadreason; /*!< Reason for last reload/load of configuration */
549 static struct sched_context *sched; /*!< The scheduling context */
550 static struct io_context *io; /*!< The IO context */
552 #define DEC_CALL_LIMIT 0
553 #define INC_CALL_LIMIT 1
554 #define DEC_CALL_RINGING 2
555 #define INC_CALL_RINGING 3
557 /*! \brief sip_request: The data grabbed from the UDP socket */
559 char *rlPart1; /*!< SIP Method Name or "SIP/2.0" protocol version */
560 char *rlPart2; /*!< The Request URI or Response Status */
561 int len; /*!< Length */
562 int headers; /*!< # of SIP Headers */
563 int method; /*!< Method of this request */
564 int lines; /*!< Body Content */
565 unsigned int flags; /*!< SIP_PKT Flags for this packet */
566 char *header[SIP_MAX_HEADERS];
567 char *line[SIP_MAX_LINES];
568 char data[SIP_MAX_PACKET];
569 unsigned int sdp_start; /*!< the line number where the SDP begins */
570 unsigned int sdp_end; /*!< the line number where the SDP ends */
574 * A sip packet is stored into the data[] buffer, with the header followed
575 * by an empty line and the body of the message.
576 * On outgoing packets, data is accumulated in data[] with len reflecting
577 * the next available byte, headers and lines count the number of lines
578 * in both parts. There are no '\0' in data[0..len-1].
580 * On received packet, the input read from the socket is copied into data[],
581 * len is set and the string is NUL-terminated. Then a parser fills up
582 * the other fields -header[] and line[] to point to the lines of the
583 * message, rlPart1 and rlPart2 parse the first lnie as below:
585 * Requests have in the first line METHOD URI SIP/2.0
586 * rlPart1 = method; rlPart2 = uri;
587 * Responses have in the first line SIP/2.0 code description
588 * rlPart1 = SIP/2.0; rlPart2 = code + description;
592 /*! \brief structure used in transfers */
594 struct ast_channel *chan1; /*!< First channel involved */
595 struct ast_channel *chan2; /*!< Second channel involved */
596 struct sip_request req; /*!< Request that caused the transfer (REFER) */
597 int seqno; /*!< Sequence number */
602 /*! \brief Parameters to the transmit_invite function */
603 struct sip_invite_param {
604 const char *distinctive_ring; /*!< Distinctive ring header */
605 int addsipheaders; /*!< Add extra SIP headers */
606 const char *uri_options; /*!< URI options to add to the URI */
607 const char *vxml_url; /*!< VXML url for Cisco phones */
608 char *auth; /*!< Authentication */
609 char *authheader; /*!< Auth header */
610 enum sip_auth_type auth_type; /*!< Authentication type */
611 const char *replaces; /*!< Replaces header for call transfers */
612 int transfer; /*!< Flag - is this Invite part of a SIP transfer? (invite/replaces) */
615 /*! \brief Structure to save routing information for a SIP session */
617 struct sip_route *next;
621 /*! \brief Modes for SIP domain handling in the PBX */
623 SIP_DOMAIN_AUTO, /*!< This domain is auto-configured */
624 SIP_DOMAIN_CONFIG, /*!< This domain is from configuration */
628 char domain[MAXHOSTNAMELEN]; /*!< SIP domain we are responsible for */
629 char context[AST_MAX_EXTENSION]; /*!< Incoming context for this domain */
630 enum domain_mode mode; /*!< How did we find this domain? */
631 AST_LIST_ENTRY(domain) list; /*!< List mechanics */
634 static AST_LIST_HEAD_STATIC(domain_list, domain); /*!< The SIP domain list */
637 /*! \brief sip_history: Structure for saving transactions within a SIP dialog */
639 AST_LIST_ENTRY(sip_history) list;
640 char event[0]; /* actually more, depending on needs */
643 AST_LIST_HEAD_NOLOCK(sip_history_head, sip_history); /*!< history list, entry in sip_pvt */
645 /*! \brief sip_auth: Creadentials for authentication to other SIP services */
647 char realm[AST_MAX_EXTENSION]; /*!< Realm in which these credentials are valid */
648 char username[256]; /*!< Username */
649 char secret[256]; /*!< Secret */
650 char md5secret[256]; /*!< MD5Secret */
651 struct sip_auth *next; /*!< Next auth structure in list */
654 /*--- Various flags for the flags field in the pvt structure */
655 #define SIP_ALREADYGONE (1 << 0) /*!< Whether or not we've already been destroyed by our peer */
656 #define SIP_NEEDDESTROY (1 << 1) /*!< if we need to be destroyed by the monitor thread */
657 #define SIP_NOVIDEO (1 << 2) /*!< Didn't get video in invite, don't offer */
658 #define SIP_RINGING (1 << 3) /*!< Have sent 180 ringing */
659 #define SIP_PROGRESS_SENT (1 << 4) /*!< Have sent 183 message progress */
660 #define SIP_NEEDREINVITE (1 << 5) /*!< Do we need to send another reinvite? */
661 #define SIP_PENDINGBYE (1 << 6) /*!< Need to send bye after we ack? */
662 #define SIP_GOTREFER (1 << 7) /*!< Got a refer? */
663 #define SIP_PROMISCREDIR (1 << 8) /*!< Promiscuous redirection */
664 #define SIP_TRUSTRPID (1 << 9) /*!< Trust RPID headers? */
665 #define SIP_USEREQPHONE (1 << 10) /*!< Add user=phone to numeric URI. Default off */
666 #define SIP_REALTIME (1 << 11) /*!< Flag for realtime users */
667 #define SIP_USECLIENTCODE (1 << 12) /*!< Trust X-ClientCode info message */
668 #define SIP_OUTGOING (1 << 13) /*!< Is this an outgoing call? */
669 #define SIP_CAN_BYE (1 << 14) /*!< Can we send BYE on this dialog? */
670 #define SIP_DEFER_BYE_ON_TRANSFER (1 << 15) /*!< Do not hangup at first ast_hangup */
671 #define SIP_DTMF (3 << 16) /*!< DTMF Support: four settings, uses two bits */
672 #define SIP_DTMF_RFC2833 (0 << 16) /*!< DTMF Support: RTP DTMF - "rfc2833" */
673 #define SIP_DTMF_INBAND (1 << 16) /*!< DTMF Support: Inband audio, only for ULAW/ALAW - "inband" */
674 #define SIP_DTMF_INFO (2 << 16) /*!< DTMF Support: SIP Info messages - "info" */
675 #define SIP_DTMF_AUTO (3 << 16) /*!< DTMF Support: AUTO switch between rfc2833 and in-band DTMF */
677 #define SIP_NAT (3 << 18) /*!< four settings, uses two bits */
678 #define SIP_NAT_NEVER (0 << 18) /*!< No nat support */
679 #define SIP_NAT_RFC3581 (1 << 18) /*!< NAT RFC3581 */
680 #define SIP_NAT_ROUTE (2 << 18) /*!< NAT Only ROUTE */
681 #define SIP_NAT_ALWAYS (3 << 18) /*!< NAT Both ROUTE and RFC3581 */
682 /* re-INVITE related settings */
683 #define SIP_REINVITE (7 << 20) /*!< three bits used */
684 #define SIP_CAN_REINVITE (1 << 20) /*!< allow peers to be reinvited to send media directly p2p */
685 #define SIP_CAN_REINVITE_NAT (2 << 20) /*!< allow media reinvite when new peer is behind NAT */
686 #define SIP_REINVITE_UPDATE (4 << 20) /*!< use UPDATE (RFC3311) when reinviting this peer */
687 /* "insecure" settings */
688 #define SIP_INSECURE_PORT (1 << 23) /*!< don't require matching port for incoming requests */
689 #define SIP_INSECURE_INVITE (1 << 24) /*!< don't require authentication for incoming INVITEs */
690 /* Sending PROGRESS in-band settings */
691 #define SIP_PROG_INBAND (3 << 25) /*!< three settings, uses two bits */
692 #define SIP_PROG_INBAND_NEVER (0 << 25)
693 #define SIP_PROG_INBAND_NO (1 << 25)
694 #define SIP_PROG_INBAND_YES (2 << 25)
695 #define SIP_CALL_ONHOLD (1 << 27) /*!< Call states */
696 #define SIP_CALL_LIMIT (1 << 28) /*!< Call limit enforced for this call */
697 #define SIP_SENDRPID (1 << 29) /*!< Remote Party-ID Support */
698 #define SIP_INC_COUNT (1 << 30) /*!< Did this connection increment the counter of in-use calls? */
700 #define SIP_FLAGS_TO_COPY \
701 (SIP_PROMISCREDIR | SIP_TRUSTRPID | SIP_SENDRPID | SIP_DTMF | SIP_REINVITE | \
702 SIP_PROG_INBAND | SIP_USECLIENTCODE | SIP_NAT | \
703 SIP_USEREQPHONE | SIP_INSECURE_PORT | SIP_INSECURE_INVITE)
705 /* a new page of flags for peers */
706 #define SIP_PAGE2_RTCACHEFRIENDS (1 << 0)
707 #define SIP_PAGE2_RTUPDATE (1 << 1)
708 #define SIP_PAGE2_RTAUTOCLEAR (1 << 2)
709 #define SIP_PAGE2_IGNOREREGEXPIRE (1 << 3)
710 #define SIP_PAGE2_RT_FROMCONTACT (1 << 4)
711 #define SIP_PAGE2_DEBUG (3 << 5)
712 #define SIP_PAGE2_DEBUG_CONFIG (1 << 5)
713 #define SIP_PAGE2_DEBUG_CONSOLE (1 << 6)
714 #define SIP_PAGE2_DYNAMIC (1 << 7) /*!< Dynamic Peers register with Asterisk */
715 #define SIP_PAGE2_SELFDESTRUCT (1 << 8) /*!< Automatic peers need to destruct themselves */
716 #define SIP_PAGE2_VIDEOSUPPORT (1 << 9)
717 #define SIP_PAGE2_ALLOWSUBSCRIBE (1 << 10) /*!< Allow subscriptions from this peer? */
718 #define SIP_PAGE2_ALLOWOVERLAP (1 << 11) /*!< Allow overlap dialing ? */
719 #define SIP_PAGE2_SUBSCRIBEMWIONLY (1 << 12) /*!< Only issue MWI notification if subscribed to */
720 #define SIP_PAGE2_INC_RINGING (1 << 13) /*!< Did this connection increment the counter of in-use calls? */
721 #define SIP_PAGE2_T38SUPPORT (7 << 14) /*!< T38 Fax Passthrough Support */
722 #define SIP_PAGE2_T38SUPPORT_UDPTL (1 << 14) /*!< 14: T38 Fax Passthrough Support */
723 #define SIP_PAGE2_T38SUPPORT_RTP (2 << 14) /*!< 15: T38 Fax Passthrough Support */
724 #define SIP_PAGE2_T38SUPPORT_TCP (4 << 14) /*!< 16: T38 Fax Passthrough Support */
726 #define SIP_PAGE2_FLAGS_TO_COPY \
727 (SIP_PAGE2_ALLOWSUBSCRIBE | SIP_PAGE2_ALLOWOVERLAP | SIP_PAGE2_VIDEOSUPPORT | SIP_PAGE2_T38SUPPORT)
729 /* SIP packet flags */
730 #define SIP_PKT_DEBUG (1 << 0) /*!< Debug this packet */
731 #define SIP_PKT_WITH_TOTAG (1 << 1) /*!< This packet has a to-tag */
732 #define SIP_PKT_IGNORE (1 << 2) /*!< This is a re-transmit, ignore it */
733 #define SIP_PKT_IGNORE_RESP (1 << 3) /*!< Resp ignore - ??? */
734 #define SIP_PKT_IGNORE_REQ (1 << 4) /*!< Req ignore - ??? */
736 /* T.38 set of flags */
737 #define T38FAX_FILL_BIT_REMOVAL (1 << 0) /*!< Default: 0 (unset)*/
738 #define T38FAX_TRANSCODING_MMR (1 << 1) /*!< Default: 0 (unset)*/
739 #define T38FAX_TRANSCODING_JBIG (1 << 2) /*!< Default: 0 (unset)*/
740 /* Rate management */
741 #define T38FAX_RATE_MANAGEMENT_TRANSFERED_TCF (0 << 3)
742 #define T38FAX_RATE_MANAGEMENT_LOCAL_TCF (1 << 3) /*!< Unset for transferredTCF (UDPTL), set for localTCF (TPKT) */
743 /* UDP Error correction */
744 #define T38FAX_UDP_EC_NONE (0 << 4) /*!< two bits, if unset NO t38UDPEC field in T38 SDP*/
745 #define T38FAX_UDP_EC_FEC (1 << 4) /*!< Set for t38UDPFEC */
746 #define T38FAX_UDP_EC_REDUNDANCY (2 << 4) /*!< Set for t38UDPRedundancy */
747 /* T38 Spec version */
748 #define T38FAX_VERSION (3 << 6) /*!< two bits, 2 values so far, up to 4 values max */
749 #define T38FAX_VERSION_0 (0 << 6) /*!< Version 0 */
750 #define T38FAX_VERSION_1 (1 << 6) /*!< Version 1 */
751 /* Maximum Fax Rate */
752 #define T38FAX_RATE_2400 (1 << 8) /*!< 2400 bps t38FaxRate */
753 #define T38FAX_RATE_4800 (1 << 9) /*!< 4800 bps t38FaxRate */
754 #define T38FAX_RATE_7200 (1 << 10) /*!< 7200 bps t38FaxRate */
755 #define T38FAX_RATE_9600 (1 << 11) /*!< 9600 bps t38FaxRate */
756 #define T38FAX_RATE_12000 (1 << 12) /*!< 12000 bps t38FaxRate */
757 #define T38FAX_RATE_14400 (1 << 13) /*!< 14400 bps t38FaxRate */
759 /*!< This is default: NO MMR and JBIG trancoding, NO fill bit removal, transferredTCF TCF, UDP FEC, Version 0 and 9600 max fax rate */
760 static int global_t38_capability = T38FAX_VERSION_0 | T38FAX_RATE_2400 | T38FAX_RATE_4800 | T38FAX_RATE_7200 | T38FAX_RATE_9600;
762 #define sipdebug ast_test_flag(&global_flags[1], SIP_PAGE2_DEBUG)
763 #define sipdebug_config ast_test_flag(&global_flags[1], SIP_PAGE2_DEBUG_CONFIG)
764 #define sipdebug_console ast_test_flag(&global_flags[1], SIP_PAGE2_DEBUG_CONSOLE)
766 /*! \brief T38 Sates for a call */
768 T38_DISABLED = 0, /*! Not enabled */
769 T38_LOCAL_DIRECT, /*! Offered from local */
770 T38_LOCAL_REINVITE, /*! Offered from local - REINVITE */
771 T38_PEER_DIRECT, /*! Offered from peer */
772 T38_PEER_REINVITE, /*! Offered from peer - REINVITE */
773 T38_ENABLED /*! Negotiated (enabled) */
776 /*! \brief T.38 channel settings (at some point we need to make this alloc'ed */
777 struct t38properties {
778 struct ast_flags t38support; /*!< Flag for udptl, rtp or tcp support for this session */
779 int capability; /*!< Our T38 capability */
780 int peercapability; /*!< Peers T38 capability */
781 int jointcapability; /*!< Supported T38 capability at both ends */
782 enum t38state state; /*!< T.38 state */
785 /*! \brief Parameters to know status of transfer */
787 REFER_IDLE, /*!< No REFER is in progress */
788 REFER_SENT, /*!< Sent REFER to transferee */
789 REFER_RECEIVED, /*!< Received REFER from transferer */
790 REFER_CONFIRMED, /*!< Refer confirmed with a 100 TRYING */
791 REFER_ACCEPTED, /*!< Accepted by transferee */
792 REFER_RINGING, /*!< Target Ringing */
793 REFER_200OK, /*!< Answered by transfer target */
794 REFER_FAILED, /*!< REFER declined - go on */
795 REFER_NOAUTH /*!< We had no auth for REFER */
798 static const struct c_referstatusstring {
799 enum referstatus status;
801 } referstatusstrings[] = {
802 { REFER_IDLE, "<none>" },
803 { REFER_SENT, "Request sent" },
804 { REFER_RECEIVED, "Request received" },
805 { REFER_ACCEPTED, "Accepted" },
806 { REFER_RINGING, "Target ringing" },
807 { REFER_200OK, "Done" },
808 { REFER_FAILED, "Failed" },
809 { REFER_NOAUTH, "Failed - auth failure" }
812 /*! \brief Structure to handle SIP transfers. Dynamically allocated when needed */
813 /* OEJ: Should be moved to string fields */
815 char refer_to[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO extension */
816 char refer_to_domain[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO domain */
817 char refer_to_urioption[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO uri options */
818 char refer_to_context[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO context */
819 char referred_by[AST_MAX_EXTENSION]; /*!< Place to store REFERRED-BY extension */
820 char referred_by_name[AST_MAX_EXTENSION]; /*!< Place to store REFERRED-BY extension */
821 char refer_contact[AST_MAX_EXTENSION]; /*!< Place to store Contact info from a REFER extension */
822 char replaces_callid[BUFSIZ]; /*!< Replace info */
823 char replaces_callid_totag[BUFSIZ/2]; /*!< Replace info */
824 char replaces_callid_fromtag[BUFSIZ/2]; /*!< Replace info */
825 struct sip_pvt *refer_call; /*!< Call we are referring */
826 int attendedtransfer; /*!< Attended or blind transfer? */
827 int localtransfer; /*!< Transfer to local domain? */
828 enum referstatus status; /*!< REFER status */
831 /*! \brief sip_pvt: PVT structures are used for each SIP dialog, ie. a call, a registration, a subscribe */
832 static struct sip_pvt {
833 ast_mutex_t lock; /*!< Dialog private lock */
834 int method; /*!< SIP method that opened this dialog */
835 AST_DECLARE_STRING_FIELDS(
836 AST_STRING_FIELD(callid); /*!< Global CallID */
837 AST_STRING_FIELD(randdata); /*!< Random data */
838 AST_STRING_FIELD(accountcode); /*!< Account code */
839 AST_STRING_FIELD(realm); /*!< Authorization realm */
840 AST_STRING_FIELD(nonce); /*!< Authorization nonce */
841 AST_STRING_FIELD(opaque); /*!< Opaque nonsense */
842 AST_STRING_FIELD(qop); /*!< Quality of Protection, since SIP wasn't complicated enough yet. */
843 AST_STRING_FIELD(domain); /*!< Authorization domain */
844 AST_STRING_FIELD(from); /*!< The From: header */
845 AST_STRING_FIELD(useragent); /*!< User agent in SIP request */
846 AST_STRING_FIELD(exten); /*!< Extension where to start */
847 AST_STRING_FIELD(context); /*!< Context for this call */
848 AST_STRING_FIELD(subscribecontext); /*!< Subscribecontext */
849 AST_STRING_FIELD(subscribeuri); /*!< Subscribecontext */
850 AST_STRING_FIELD(fromdomain); /*!< Domain to show in the from field */
851 AST_STRING_FIELD(fromuser); /*!< User to show in the user field */
852 AST_STRING_FIELD(fromname); /*!< Name to show in the user field */
853 AST_STRING_FIELD(tohost); /*!< Host we should put in the "to" field */
854 AST_STRING_FIELD(language); /*!< Default language for this call */
855 AST_STRING_FIELD(musicclass); /*!< Music on Hold class */
856 AST_STRING_FIELD(rdnis); /*!< Referring DNIS */
857 AST_STRING_FIELD(theirtag); /*!< Their tag */
858 AST_STRING_FIELD(username); /*!< [user] name */
859 AST_STRING_FIELD(peername); /*!< [peer] name, not set if [user] */
860 AST_STRING_FIELD(authname); /*!< Who we use for authentication */
861 AST_STRING_FIELD(uri); /*!< Original requested URI */
862 AST_STRING_FIELD(okcontacturi); /*!< URI from the 200 OK on INVITE */
863 AST_STRING_FIELD(peersecret); /*!< Password */
864 AST_STRING_FIELD(peermd5secret);
865 AST_STRING_FIELD(cid_num); /*!< Caller*ID */
866 AST_STRING_FIELD(cid_name); /*!< Caller*ID */
867 AST_STRING_FIELD(via); /*!< Via: header */
868 AST_STRING_FIELD(fullcontact); /*!< The Contact: that the UA registers with us */
869 AST_STRING_FIELD(our_contact); /*!< Our contact header */
870 AST_STRING_FIELD(rpid); /*!< Our RPID header */
871 AST_STRING_FIELD(rpid_from); /*!< Our RPID From header */
873 struct ast_codec_pref prefs; /*!< codec prefs */
874 unsigned int ocseq; /*!< Current outgoing seqno */
875 unsigned int icseq; /*!< Current incoming seqno */
876 ast_group_t callgroup; /*!< Call group */
877 ast_group_t pickupgroup; /*!< Pickup group */
878 int lastinvite; /*!< Last Cseq of invite */
879 struct ast_flags flags[2]; /*!< SIP_ flags */
880 int timer_t1; /*!< SIP timer T1, ms rtt */
881 unsigned int sipoptions; /*!< Supported SIP sipoptions on the other end */
882 int capability; /*!< Special capability (codec) */
883 int jointcapability; /*!< Supported capability at both ends (codecs ) */
884 int peercapability; /*!< Supported peer capability */
885 int prefcodec; /*!< Preferred codec (outbound only) */
886 int noncodeccapability; /*!< DTMF RFC2833 telephony-event */
887 int redircodecs; /*!< Redirect codecs */
888 int maxcallbitrate; /*!< Maximum Call Bitrate for Video Calls */
889 struct t38properties t38; /*!< T38 settings */
890 struct sockaddr_in udptlredirip; /*!< Where our T.38 UDPTL should be going if not to us */
891 struct ast_udptl *udptl; /*!< T.38 UDPTL session */
892 int callingpres; /*!< Calling presentation */
893 int authtries; /*!< Times we've tried to authenticate */
894 int expiry; /*!< How long we take to expire */
895 long branch; /*!< One random number */
896 char tag[11]; /*!< Another random number */
897 int sessionid; /*!< SDP Session ID */
898 int sessionversion; /*!< SDP Session Version */
899 struct sockaddr_in sa; /*!< Our peer */
900 struct sockaddr_in redirip; /*!< Where our RTP should be going if not to us */
901 struct sockaddr_in vredirip; /*!< Where our Video RTP should be going if not to us */
902 struct sockaddr_in recv; /*!< Received as */
903 struct in_addr ourip; /*!< Our IP */
904 struct ast_channel *owner; /*!< Who owns us */
905 struct sip_route *route; /*!< Head of linked list of routing steps (fm Record-Route) */
906 int route_persistant; /*!< Is this the "real" route? */
907 struct sip_auth *peerauth; /*!< Realm authentication */
908 int noncecount; /*!< Nonce-count */
909 char lastmsg[256]; /*!< Last Message sent/received */
910 int amaflags; /*!< AMA Flags */
911 int pendinginvite; /*!< Any pending invite */
912 struct sip_request initreq; /*!< Initial request that opened the SIP dialog */
914 int maxtime; /*!< Max time for first response */
915 int initid; /*!< Auto-congest ID if appropriate */
916 int autokillid; /*!< Auto-kill ID */
917 time_t lastrtprx; /*!< Last RTP received */
918 time_t lastrtptx; /*!< Last RTP sent */
919 int rtptimeout; /*!< RTP timeout time */
920 int rtpholdtimeout; /*!< RTP timeout when on hold */
921 int rtpkeepalive; /*!< Send RTP packets for keepalive */
922 enum transfermodes allowtransfer; /*! SIP Refer restriction scheme */
923 enum subscriptiontype subscribed; /*!< SUBSCRIBE: Is this dialog a subscription? */
924 int stateid; /*!< SUBSCRIBE: ID for devicestate subscriptions */
925 int laststate; /*!< SUBSCRIBE: Last known extension state */
926 int dialogver; /*!< SUBSCRIBE: Version for subscription dialog-info */
928 struct sip_refer *refer; /*!< REFER: SIP transfer data structure */
929 struct ast_dsp *vad; /*!< Voice Activation Detection dsp */
931 struct sip_peer *relatedpeer; /*!< If this dialog is related to a peer, which one
932 Used in peerpoke, mwi subscriptions */
933 struct sip_registry *registry; /*!< If this is a REGISTER dialog, to which registry */
934 struct ast_rtp *rtp; /*!< RTP Session */
935 struct ast_rtp *vrtp; /*!< Video RTP session */
936 struct sip_pkt *packets; /*!< Packets scheduled for re-transmission */
937 struct sip_history_head *history; /*!< History of this SIP dialog */
938 struct ast_variable *chanvars; /*!< Channel variables to set for inbound call */
939 struct sip_pvt *next; /*!< Next dialog in chain */
940 struct sip_invite_param *options; /*!< Options for INVITE */
943 #define FLAG_RESPONSE (1 << 0)
944 #define FLAG_FATAL (1 << 1)
946 /*! \brief sip packet - raw format for outbound packets that are sent or scheduled for transmission */
948 struct sip_pkt *next; /*!< Next packet in linked list */
949 int retrans; /*!< Retransmission number */
950 int method; /*!< SIP method for this packet */
951 int seqno; /*!< Sequence number */
952 unsigned int flags; /*!< non-zero if this is a response packet (e.g. 200 OK) */
953 struct sip_pvt *owner; /*!< Owner AST call */
954 int retransid; /*!< Retransmission ID */
955 int timer_a; /*!< SIP timer A, retransmission timer */
956 int timer_t1; /*!< SIP Timer T1, estimated RTT or 500 ms */
957 int packetlen; /*!< Length of packet */
961 /*! \brief Structure for SIP user data. User's place calls to us */
963 /* Users who can access various contexts */
964 ASTOBJ_COMPONENTS(struct sip_user);
965 char secret[80]; /*!< Password */
966 char md5secret[80]; /*!< Password in md5 */
967 char context[AST_MAX_CONTEXT]; /*!< Default context for incoming calls */
968 char subscribecontext[AST_MAX_CONTEXT]; /* Default context for subscriptions */
969 char cid_num[80]; /*!< Caller ID num */
970 char cid_name[80]; /*!< Caller ID name */
971 char accountcode[AST_MAX_ACCOUNT_CODE]; /* Account code */
972 char language[MAX_LANGUAGE]; /*!< Default language for this user */
973 char musicclass[MAX_MUSICCLASS];/*!< Music on Hold class */
974 char useragent[256]; /*!< User agent in SIP request */
975 struct ast_codec_pref prefs; /*!< codec prefs */
976 ast_group_t callgroup; /*!< Call group */
977 ast_group_t pickupgroup; /*!< Pickup Group */
978 unsigned int sipoptions; /*!< Supported SIP options */
979 struct ast_flags flags[2]; /*!< SIP_ flags */
980 int amaflags; /*!< AMA flags for billing */
981 int callingpres; /*!< Calling id presentation */
982 int capability; /*!< Codec capability */
983 int inUse; /*!< Number of calls in use */
984 int call_limit; /*!< Limit of concurrent calls */
985 enum transfermodes allowtransfer; /*! SIP Refer restriction scheme */
986 struct ast_ha *ha; /*!< ACL setting */
987 struct ast_variable *chanvars; /*!< Variables to set for channel created by user */
988 int maxcallbitrate; /*!< Maximum Bitrate for a video call */
991 /*! \brief Structure for SIP peer data, we place calls to peers if registered or fixed IP address (host) */
992 /* XXX field 'name' must be first otherwise sip_addrcmp() will fail */
994 ASTOBJ_COMPONENTS(struct sip_peer); /*!< name, refcount, objflags, object pointers */
995 /*!< peer->name is the unique name of this object */
996 char secret[80]; /*!< Password */
997 char md5secret[80]; /*!< Password in MD5 */
998 struct sip_auth *auth; /*!< Realm authentication list */
999 char context[AST_MAX_CONTEXT]; /*!< Default context for incoming calls */
1000 char subscribecontext[AST_MAX_CONTEXT]; /*!< Default context for subscriptions */
1001 char username[80]; /*!< Temporary username until registration */
1002 char accountcode[AST_MAX_ACCOUNT_CODE]; /*!< Account code */
1003 int amaflags; /*!< AMA Flags (for billing) */
1004 char tohost[MAXHOSTNAMELEN]; /*!< If not dynamic, IP address */
1005 char regexten[AST_MAX_EXTENSION]; /*!< Extension to register (if regcontext is used) */
1006 char fromuser[80]; /*!< From: user when calling this peer */
1007 char fromdomain[MAXHOSTNAMELEN]; /*!< From: domain when calling this peer */
1008 char fullcontact[256]; /*!< Contact registered with us (not in sip.conf) */
1009 char cid_num[80]; /*!< Caller ID num */
1010 char cid_name[80]; /*!< Caller ID name */
1011 int callingpres; /*!< Calling id presentation */
1012 int inUse; /*!< Number of calls in use */
1013 int inRinging; /*!< Number of calls ringing */
1014 int call_limit; /*!< Limit of concurrent calls */
1015 enum transfermodes allowtransfer; /*! SIP Refer restriction scheme */
1016 char vmexten[AST_MAX_EXTENSION]; /*!< Dialplan extension for MWI notify message*/
1017 char mailbox[AST_MAX_EXTENSION]; /*!< Mailbox setting for MWI checks */
1018 char language[MAX_LANGUAGE]; /*!< Default language for prompts */
1019 char musicclass[MAX_MUSICCLASS];/*!< Music on Hold class */
1020 char useragent[256]; /*!< User agent in SIP request (saved from registration) */
1021 struct ast_codec_pref prefs; /*!< codec prefs */
1023 time_t lastmsgcheck; /*!< Last time we checked for MWI */
1024 unsigned int sipoptions; /*!< Supported SIP options */
1025 struct ast_flags flags[2]; /*!< SIP_ flags */
1026 int expire; /*!< When to expire this peer registration */
1027 int capability; /*!< Codec capability */
1028 int rtptimeout; /*!< RTP timeout */
1029 int rtpholdtimeout; /*!< RTP Hold Timeout */
1030 int rtpkeepalive; /*!< Send RTP packets for keepalive */
1031 ast_group_t callgroup; /*!< Call group */
1032 ast_group_t pickupgroup; /*!< Pickup group */
1033 struct ast_dnsmgr_entry *dnsmgr;/*!< DNS refresh manager for peer */
1034 struct sockaddr_in addr; /*!< IP address of peer */
1035 int maxcallbitrate; /*!< Maximum Bitrate for a video call */
1038 struct sip_pvt *call; /*!< Call pointer */
1039 int pokeexpire; /*!< When to expire poke (qualify= checking) */
1040 int lastms; /*!< How long last response took (in ms), or -1 for no response */
1041 int maxms; /*!< Max ms we will accept for the host to be up, 0 to not monitor */
1042 struct timeval ps; /*!< Ping send time */
1044 struct sockaddr_in defaddr; /*!< Default IP address, used until registration */
1045 struct ast_ha *ha; /*!< Access control list */
1046 struct ast_variable *chanvars; /*!< Variables to set for channel created by user */
1047 struct sip_pvt *mwipvt; /*!< Subscription for MWI */
1053 /*! \brief Registrations with other SIP proxies */
1054 struct sip_registry {
1055 ASTOBJ_COMPONENTS_FULL(struct sip_registry,1,1);
1056 AST_DECLARE_STRING_FIELDS(
1057 AST_STRING_FIELD(callid); /*!< Global Call-ID */
1058 AST_STRING_FIELD(realm); /*!< Authorization realm */
1059 AST_STRING_FIELD(nonce); /*!< Authorization nonce */
1060 AST_STRING_FIELD(opaque); /*!< Opaque nonsense */
1061 AST_STRING_FIELD(qop); /*!< Quality of Protection, since SIP wasn't complicated enough yet. */
1062 AST_STRING_FIELD(domain); /*!< Authorization domain */
1063 AST_STRING_FIELD(username); /*!< Who we are registering as */
1064 AST_STRING_FIELD(authuser); /*!< Who we *authenticate* as */
1065 AST_STRING_FIELD(hostname); /*!< Domain or host we register to */
1066 AST_STRING_FIELD(secret); /*!< Password in clear text */
1067 AST_STRING_FIELD(md5secret); /*!< Password in md5 */
1068 AST_STRING_FIELD(contact); /*!< Contact extension */
1069 AST_STRING_FIELD(random);
1071 int portno; /*!< Optional port override */
1072 int expire; /*!< Sched ID of expiration */
1073 int regattempts; /*!< Number of attempts (since the last success) */
1074 int timeout; /*!< sched id of sip_reg_timeout */
1075 int refresh; /*!< How often to refresh */
1076 struct sip_pvt *call; /*!< create a sip_pvt structure for each outbound "registration dialog" in progress */
1077 enum sipregistrystate regstate; /*!< Registration state (see above) */
1078 time_t regtime; /*!< Last succesful registration time */
1079 int callid_valid; /*!< 0 means we haven't chosen callid for this registry yet. */
1080 unsigned int ocseq; /*!< Sequence number we got to for REGISTERs for this registry */
1081 struct sockaddr_in us; /*!< Who the server thinks we are */
1082 int noncecount; /*!< Nonce-count */
1083 char lastmsg[256]; /*!< Last Message sent/received */
1086 /* --- Linked lists of various objects --------*/
1088 /*! \brief The user list: Users and friends */
1089 static struct ast_user_list {
1090 ASTOBJ_CONTAINER_COMPONENTS(struct sip_user);
1093 /*! \brief The peer list: Peers and Friends */
1094 static struct ast_peer_list {
1095 ASTOBJ_CONTAINER_COMPONENTS(struct sip_peer);
1098 /*! \brief The register list: Other SIP proxys we register with and place calls to */
1099 static struct ast_register_list {
1100 ASTOBJ_CONTAINER_COMPONENTS(struct sip_registry);
1104 /*! \todo Move the sip_auth list to AST_LIST */
1105 static struct sip_auth *authl = NULL; /*!< Authentication list for realm authentication */
1108 /* --- Sockets and networking --------------*/
1109 static int sipsock = -1; /*!< Main socket for SIP network communication */
1110 static struct sockaddr_in bindaddr = { 0, }; /*!< The address we bind to */
1111 static struct sockaddr_in externip; /*!< External IP address if we are behind NAT */
1112 static char externhost[MAXHOSTNAMELEN]; /*!< External host name (possibly with dynamic DNS and DHCP */
1113 static time_t externexpire = 0; /*!< Expiration counter for re-resolving external host name in dynamic DNS */
1114 static int externrefresh = 10;
1115 static struct ast_ha *localaddr; /*!< List of local networks, on the same side of NAT as this Asterisk */
1116 static struct in_addr __ourip;
1117 static struct sockaddr_in outboundproxyip;
1119 static struct sockaddr_in debugaddr;
1121 static struct ast_config *notify_types; /*!< The list of manual NOTIFY types we know how to send */
1123 /*---------------------------- Forward declarations of functions in chan_sip.c */
1124 /*! \note This is added to help splitting up chan_sip.c into several files
1125 in coming releases */
1127 /*--- PBX interface functions */
1128 static struct ast_channel *sip_request_call(const char *type, int format, void *data, int *cause);
1129 static int sip_devicestate(void *data);
1130 static int sip_sendtext(struct ast_channel *ast, const char *text);
1131 static int sip_call(struct ast_channel *ast, char *dest, int timeout);
1132 static int sip_hangup(struct ast_channel *ast);
1133 static int sip_answer(struct ast_channel *ast);
1134 static struct ast_frame *sip_read(struct ast_channel *ast);
1135 static int sip_write(struct ast_channel *ast, struct ast_frame *frame);
1136 static int sip_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen);
1137 static int sip_transfer(struct ast_channel *ast, const char *dest);
1138 static int sip_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
1139 static int sip_senddigit(struct ast_channel *ast, char digit);
1141 /*--- Transmitting responses and requests */
1142 static int sipsock_read(int *id, int fd, short events, void *ignore);
1143 static int __sip_xmit(struct sip_pvt *p, char *data, int len);
1144 static int __sip_reliable_xmit(struct sip_pvt *p, int seqno, int resp, char *data, int len, int fatal, int sipmethod);
1145 static int __transmit_response(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
1146 static int retrans_pkt(void *data);
1147 static int transmit_sip_request(struct sip_pvt *p, struct sip_request *req);
1148 static int transmit_response(struct sip_pvt *p, const char *msg, const struct sip_request *req);
1149 static int transmit_response_reliable(struct sip_pvt *p, const char *msg, const struct sip_request *req);
1150 static int transmit_response_with_date(struct sip_pvt *p, const char *msg, const struct sip_request *req);
1151 static int transmit_response_with_sdp(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
1152 static int transmit_response_with_unsupported(struct sip_pvt *p, const char *msg, const struct sip_request *req, const char *unsupported);
1153 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);
1154 static int transmit_response_with_allow(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
1155 static void transmit_fake_auth_response(struct sip_pvt *p, struct sip_request *req, int reliable);
1156 static int transmit_request(struct sip_pvt *p, int sipmethod, int inc, enum xmittype reliable, int newbranch);
1157 static int transmit_request_with_auth(struct sip_pvt *p, int sipmethod, int seqno, enum xmittype reliable, int newbranch);
1158 static int transmit_invite(struct sip_pvt *p, int sipmethod, int sdp, int init);
1159 static int transmit_reinvite_with_sdp(struct sip_pvt *p);
1160 static int transmit_info_with_digit(struct sip_pvt *p, const char digit);
1161 static int transmit_info_with_vidupdate(struct sip_pvt *p);
1162 static int transmit_message_with_text(struct sip_pvt *p, const char *text);
1163 static int transmit_refer(struct sip_pvt *p, const char *dest);
1164 static int transmit_notify_with_mwi(struct sip_pvt *p, int newmsgs, int oldmsgs, char *vmexten);
1165 static int transmit_notify_with_sipfrag(struct sip_pvt *p, int cseq, char *message, int terminate);
1166 static int transmit_state_notify(struct sip_pvt *p, int state, int full);
1167 static int transmit_register(struct sip_registry *r, int sipmethod, const char *auth, const char *authheader);
1168 static int send_response(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno);
1169 static int send_request(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno);
1170 static void copy_request(struct sip_request *dst, const struct sip_request *src);
1171 static void receive_message(struct sip_pvt *p, struct sip_request *req);
1172 static void parse_moved_contact(struct sip_pvt *p, struct sip_request *req);
1173 static int sip_send_mwi_to_peer(struct sip_peer *peer);
1174 static int does_peer_need_mwi(struct sip_peer *peer);
1176 /*--- Dialog management */
1177 static struct sip_pvt *sip_alloc(ast_string_field callid, struct sockaddr_in *sin,
1178 int useglobal_nat, const int intended_method);
1179 static int __sip_autodestruct(void *data);
1180 static void sip_scheddestroy(struct sip_pvt *p, int ms);
1181 static void sip_cancel_destroy(struct sip_pvt *p);
1182 static void sip_destroy(struct sip_pvt *p);
1183 static void __sip_destroy(struct sip_pvt *p, int lockowner);
1184 static void __sip_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod, int reset);
1185 static void __sip_pretend_ack(struct sip_pvt *p);
1186 static int __sip_semi_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod);
1187 static int auto_congest(void *nothing);
1188 static int update_call_counter(struct sip_pvt *fup, int event);
1189 static int hangup_sip2cause(int cause);
1190 static const char *hangup_cause2sip(int cause);
1191 static struct sip_pvt *find_call(struct sip_request *req, struct sockaddr_in *sin, const int intended_method);
1192 static void free_old_route(struct sip_route *route);
1193 static void list_route(struct sip_route *route);
1194 static void build_route(struct sip_pvt *p, struct sip_request *req, int backwards);
1195 static enum check_auth_result register_verify(struct sip_pvt *p, struct sockaddr_in *sin,
1196 struct sip_request *req, char *uri);
1197 static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag);
1198 static void check_pendings(struct sip_pvt *p);
1199 static void *sip_park_thread(void *stuff);
1200 static int sip_park(struct ast_channel *chan1, struct ast_channel *chan2, struct sip_request *req, int seqno);
1201 static int sip_sipredirect(struct sip_pvt *p, const char *dest);
1203 /*--- Codec handling / SDP */
1204 static void try_suggested_sip_codec(struct sip_pvt *p);
1205 static const char* get_sdp_iterate(int* start, struct sip_request *req, const char *name);
1206 static const char *get_sdp(struct sip_request *req, const char *name);
1207 static int find_sdp(struct sip_request *req);
1208 static int process_sdp(struct sip_pvt *p, struct sip_request *req);
1209 static void add_codec_to_sdp(const struct sip_pvt *p, int codec, int sample_rate,
1210 char **m_buf, size_t *m_size, char **a_buf, size_t *a_size,
1212 static void add_noncodec_to_sdp(const struct sip_pvt *p, int format, int sample_rate,
1213 char **m_buf, size_t *m_size, char **a_buf, size_t *a_size,
1215 static int add_sdp(struct sip_request *resp, struct sip_pvt *p);
1217 /*--- Authentication stuff */
1218 static int do_proxy_auth(struct sip_pvt *p, struct sip_request *req, char *header, char *respheader, int sipmethod, int init);
1219 static int reply_digest(struct sip_pvt *p, struct sip_request *req, char *header, int sipmethod, char *digest, int digest_len);
1220 static int build_reply_digest(struct sip_pvt *p, int method, char *digest, int digest_len);
1221 static int clear_realm_authentication(struct sip_auth *authlist); /* Clear realm authentication list (at reload) */
1222 static struct sip_auth *add_realm_authentication(struct sip_auth *authlist, char *configuration, int lineno); /* Add realm authentication in list */
1223 static struct sip_auth *find_realm_authentication(struct sip_auth *authlist, const char *realm); /* Find authentication for a specific realm */
1224 static enum check_auth_result check_auth(struct sip_pvt *p, struct sip_request *req, const char *username,
1225 const char *secret, const char *md5secret, int sipmethod,
1226 char *uri, enum xmittype reliable, int ignore);
1227 static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_request *req,
1228 int sipmethod, char *uri, enum xmittype reliable,
1229 struct sockaddr_in *sin, struct sip_peer **authpeer);
1230 static int check_user(struct sip_pvt *p, struct sip_request *req, int sipmethod, char *uri, enum xmittype reliable, struct sockaddr_in *sin);
1231 static int do_proxy_auth(struct sip_pvt *p, struct sip_request *req, char *header, char *respheader, int sipmethod, int init);
1232 static int build_reply_digest(struct sip_pvt *p, int method, char* digest, int digest_len);
1234 /*--- Domain handling */
1235 static int check_sip_domain(const char *domain, char *context, size_t len); /* Check if domain is one of our local domains */
1236 static int add_sip_domain(const char *domain, const enum domain_mode mode, const char *context);
1237 static void clear_sip_domains(void);
1239 /*--- SIP realm authentication */
1240 static struct sip_auth *add_realm_authentication(struct sip_auth *authlist, char *configuration, int lineno);
1241 static int clear_realm_authentication(struct sip_auth *authlist);
1242 static struct sip_auth *find_realm_authentication(struct sip_auth *authlist, const char *realm);
1244 /*--- Misc functions */
1245 static int sip_do_reload(enum channelreloadreason reason);
1246 static int reload_config(enum channelreloadreason reason);
1247 static int expire_register(void *data);
1248 static int sip_sipredirect(struct sip_pvt *p, const char *dest);
1249 static void *do_monitor(void *data);
1250 static int restart_monitor(void);
1251 static int sip_send_mwi_to_peer(struct sip_peer *peer);
1252 static void sip_destroy(struct sip_pvt *p);
1253 static int sip_addrcmp(char *name, struct sockaddr_in *sin); /* Support for peer matching */
1254 static int sip_refer_allocate(struct sip_pvt *p);
1255 static void ast_quiet_chan(struct ast_channel *chan);
1256 static int attempt_transfer(struct sip_dual *transferer, struct sip_dual *target);
1258 /*--- Device monitoring and Device/extension state handling */
1259 static int cb_extensionstate(char *context, char* exten, int state, void *data);
1260 static int sip_devicestate(void *data);
1261 static int sip_poke_noanswer(void *data);
1262 static int sip_poke_peer(struct sip_peer *peer);
1263 static void sip_poke_all_peers(void);
1266 /*--- Applications, functions, CLI and manager command helpers */
1267 static const char *sip_nat_mode(const struct sip_pvt *p);
1268 static int sip_show_inuse(int fd, int argc, char *argv[]);
1269 static char *transfermode2str(enum transfermodes mode);
1270 static char *nat2str(int nat);
1271 static int peer_status(struct sip_peer *peer, char *status, int statuslen);
1272 static int sip_show_users(int fd, int argc, char *argv[]);
1273 static int _sip_show_peers(int fd, int *total, struct mansession *s, struct message *m, int argc, char *argv[]);
1274 static int manager_sip_show_peers( struct mansession *s, struct message *m );
1275 static int sip_show_peers(int fd, int argc, char *argv[]);
1276 static int sip_show_objects(int fd, int argc, char *argv[]);
1277 static void print_group(int fd, unsigned int group, int crlf);
1278 static const char *dtmfmode2str(int mode);
1279 static const char *insecure2str(int port, int invite);
1280 static void cleanup_stale_contexts(char *new, char *old);
1281 static void print_codec_to_cli(int fd, struct ast_codec_pref *pref);
1282 static const char *domain_mode_to_text(const enum domain_mode mode);
1283 static int sip_show_domains(int fd, int argc, char *argv[]);
1284 static int _sip_show_peer(int type, int fd, struct mansession *s, struct message *m, int argc, char *argv[]);
1285 static int manager_sip_show_peer( struct mansession *s, struct message *m);
1286 static int sip_show_peer(int fd, int argc, char *argv[]);
1287 static int _sip_show_peer(int type, int fd, struct mansession *s, struct message *m, int argc, char *argv[]);
1288 static int sip_show_user(int fd, int argc, char *argv[]);
1289 static int sip_show_registry(int fd, int argc, char *argv[]);
1290 static int sip_show_settings(int fd, int argc, char *argv[]);
1291 static const char *subscription_type2str(enum subscriptiontype subtype);
1292 static const struct cfsubscription_types *find_subscription_type(enum subscriptiontype subtype);
1293 static int __sip_show_channels(int fd, int argc, char *argv[], int subscriptions);
1294 static int sip_show_channels(int fd, int argc, char *argv[]);
1295 static int sip_show_subscriptions(int fd, int argc, char *argv[]);
1296 static int __sip_show_channels(int fd, int argc, char *argv[], int subscriptions);
1297 static char *complete_sipch(const char *line, const char *word, int pos, int state);
1298 static char *complete_sip_peer(const char *word, int state, int flags2);
1299 static char *complete_sip_show_peer(const char *line, const char *word, int pos, int state);
1300 static char *complete_sip_debug_peer(const char *line, const char *word, int pos, int state);
1301 static char *complete_sip_user(const char *word, int state, int flags2);
1302 static char *complete_sip_show_user(const char *line, const char *word, int pos, int state);
1303 static char *complete_sipnotify(const char *line, const char *word, int pos, int state);
1304 static char *complete_sip_prune_realtime_peer(const char *line, const char *word, int pos, int state);
1305 static char *complete_sip_prune_realtime_user(const char *line, const char *word, int pos, int state);
1306 static int sip_show_channel(int fd, int argc, char *argv[]);
1307 static int sip_show_history(int fd, int argc, char *argv[]);
1308 static int sip_do_debug_ip(int fd, int argc, char *argv[]);
1309 static int sip_do_debug_peer(int fd, int argc, char *argv[]);
1310 static int sip_do_debug(int fd, int argc, char *argv[]);
1311 static int sip_no_debug(int fd, int argc, char *argv[]);
1312 static int sip_notify(int fd, int argc, char *argv[]);
1313 static int sip_do_history(int fd, int argc, char *argv[]);
1314 static int sip_no_history(int fd, int argc, char *argv[]);
1315 static int func_header_read(struct ast_channel *chan, char *function, char *data, char *buf, size_t len);
1316 static int func_check_sipdomain(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len);
1317 static int function_sippeer(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len);
1318 static int function_sipchaninfo_read(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len);
1319 static int sip_dtmfmode(struct ast_channel *chan, void *data);
1320 static int sip_addheader(struct ast_channel *chan, void *data);
1321 static int sip_do_reload(enum channelreloadreason reason);
1322 static int sip_reload(int fd, int argc, char *argv[]);
1325 Functions for enabling debug per IP or fully, or enabling history logging for
1328 static void sip_dump_history(struct sip_pvt *dialog); /* Dump history to LOG_DEBUG at end of dialog, before destroying data */
1329 static inline int sip_debug_test_addr(const struct sockaddr_in *addr);
1330 static inline int sip_debug_test_pvt(struct sip_pvt *p);
1331 static void append_history_full(struct sip_pvt *p, const char *fmt, ...);
1332 static void sip_dump_history(struct sip_pvt *dialog);
1334 /*--- Device object handling */
1335 static struct sip_peer *temp_peer(const char *name);
1336 static struct sip_peer *build_peer(const char *name, struct ast_variable *v, int realtime);
1337 static struct sip_user *build_user(const char *name, struct ast_variable *v, int realtime);
1338 static int update_call_counter(struct sip_pvt *fup, int event);
1339 static void sip_destroy_peer(struct sip_peer *peer);
1340 static void sip_destroy_user(struct sip_user *user);
1341 static int sip_poke_peer(struct sip_peer *peer);
1342 static void set_peer_defaults(struct sip_peer *peer);
1343 static struct sip_peer *temp_peer(const char *name);
1344 static void register_peer_exten(struct sip_peer *peer, int onoff);
1345 static void sip_destroy_peer(struct sip_peer *peer);
1346 static void sip_destroy_user(struct sip_user *user);
1347 static struct sip_peer *find_peer(const char *peer, struct sockaddr_in *sin, int realtime);
1348 static struct sip_user *find_user(const char *name, int realtime);
1349 static int sip_poke_peer_s(void *data);
1350 static enum parse_register_result parse_register_contact(struct sip_pvt *pvt, struct sip_peer *p, struct sip_request *req);
1351 static int expire_register(void *data);
1352 static void reg_source_db(struct sip_peer *peer);
1353 static void destroy_association(struct sip_peer *peer);
1354 static int handle_common_options(struct ast_flags *flags, struct ast_flags *mask, struct ast_variable *v);
1356 /* Realtime device support */
1357 static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, const char *username, const char *fullcontact, int expirey);
1358 static struct sip_user *realtime_user(const char *username);
1359 static void update_peer(struct sip_peer *p, int expiry);
1360 static struct sip_peer *realtime_peer(const char *peername, struct sockaddr_in *sin);
1361 static int sip_prune_realtime(int fd, int argc, char *argv[]);
1363 /*--- Internal UA client handling (outbound registrations) */
1364 static int ast_sip_ouraddrfor(struct in_addr *them, struct in_addr *us);
1365 static void sip_registry_destroy(struct sip_registry *reg);
1366 static int sip_register(char *value, int lineno);
1367 static char *regstate2str(enum sipregistrystate regstate);
1368 static int sip_reregister(void *data);
1369 static int __sip_do_register(struct sip_registry *r);
1370 static int sip_reg_timeout(void *data);
1371 static int do_register_auth(struct sip_pvt *p, struct sip_request *req, char *header, char *respheader);
1372 static int reply_digest(struct sip_pvt *p, struct sip_request *req, char *header, int sipmethod, char *digest, int digest_len);
1373 static void sip_send_all_registers(void);
1375 /*--- Parsing SIP requests and responses */
1376 static void append_date(struct sip_request *req); /* Append date to SIP packet */
1377 static int determine_firstline_parts(struct sip_request *req);
1378 static const struct cfsubscription_types *find_subscription_type(enum subscriptiontype subtype);
1379 static const char *gettag(const struct sip_request *req, const char *header, char *tagbuf, int tagbufsize);
1380 static int find_sip_method(const char *msg);
1381 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported);
1382 static void parse_request(struct sip_request *req);
1383 static const char *get_header(const struct sip_request *req, const char *name);
1384 static char *referstatus2str(enum referstatus rstatus);
1385 static int method_match(enum sipmethod id, const char *name);
1386 static void parse_copy(struct sip_request *dst, const struct sip_request *src);
1387 static char *get_in_brackets(char *tmp);
1388 static const char *find_alias(const char *name, const char *_default);
1389 static const char *__get_header(const struct sip_request *req, const char *name, int *start);
1390 static const char *get_header(const struct sip_request *req, const char *name);
1391 static int lws2sws(char *msgbuf, int len);
1392 static void extract_uri(struct sip_pvt *p, struct sip_request *req);
1393 static int get_refer_info(struct sip_pvt *transferer, struct sip_request *outgoing_req);
1394 static int get_also_info(struct sip_pvt *p, struct sip_request *oreq);
1395 static int parse_ok_contact(struct sip_pvt *pvt, struct sip_request *req);
1396 static int set_address_from_contact(struct sip_pvt *pvt);
1397 static void check_via(struct sip_pvt *p, struct sip_request *req);
1398 static char *get_calleridname(const char *input, char *output, size_t outputsize);
1399 static int get_rpid_num(const char *input, char *output, int maxlen);
1400 static int get_rdnis(struct sip_pvt *p, struct sip_request *oreq);
1401 static int get_destination(struct sip_pvt *p, struct sip_request *oreq);
1402 static int get_msg_text(char *buf, int len, struct sip_request *req);
1403 static const char *gettag(const struct sip_request *req, const char *header, char *tagbuf, int tagbufsize);
1404 static void free_old_route(struct sip_route *route);
1406 /*--- Constructing requests and responses */
1407 static void initialize_initreq(struct sip_pvt *p, struct sip_request *req);
1408 static int init_req(struct sip_request *req, int sipmethod, const char *recip);
1409 static int reqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod, int seqno, int newbranch);
1410 static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod);
1411 static int init_resp(struct sip_request *resp, const char *msg);
1412 static int respprep(struct sip_request *resp, struct sip_pvt *p, const char *msg, const struct sip_request *req);
1413 static const struct sockaddr_in *sip_real_dst(const struct sip_pvt *p);
1414 static void build_via(struct sip_pvt *p);
1415 static int create_addr_from_peer(struct sip_pvt *r, struct sip_peer *peer);
1416 static int create_addr(struct sip_pvt *dialog, const char *opeer);
1417 static char *generate_random_string(char *buf, size_t size);
1418 static void build_callid_pvt(struct sip_pvt *pvt);
1419 static void build_callid_registry(struct sip_registry *reg, struct in_addr ourip, const char *fromdomain);
1420 static void make_our_tag(char *tagbuf, size_t len);
1421 static int add_header(struct sip_request *req, const char *var, const char *value);
1422 static int add_header_contentLength(struct sip_request *req, int len);
1423 static int add_line(struct sip_request *req, const char *line);
1424 static int add_text(struct sip_request *req, const char *text);
1425 static int add_digit(struct sip_request *req, char digit);
1426 static int add_vidupdate(struct sip_request *req);
1427 static void add_route(struct sip_request *req, struct sip_route *route);
1428 static int copy_header(struct sip_request *req, const struct sip_request *orig, const char *field);
1429 static int copy_all_header(struct sip_request *req, const struct sip_request *orig, const char *field);
1430 static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, const struct sip_request *orig, const char *field);
1431 static void set_destination(struct sip_pvt *p, char *uri);
1432 static void append_date(struct sip_request *req);
1433 static void build_contact(struct sip_pvt *p);
1434 static void build_rpid(struct sip_pvt *p);
1436 /*------Request handling functions */
1437 static int handle_request(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int *recount, int *nounlock);
1438 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);
1439 static int handle_request_refer(struct sip_pvt *p, struct sip_request *req, int debug, int ignore, int seqno, int *nounlock);
1440 static int handle_request_bye(struct sip_pvt *p, struct sip_request *req);
1441 static int handle_request_register(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, char *e);
1442 static int handle_request_cancel(struct sip_pvt *p, struct sip_request *req);
1443 static int handle_request_message(struct sip_pvt *p, struct sip_request *req);
1444 static int handle_request_subscribe(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int seqno, char *e);
1445 static void handle_request_info(struct sip_pvt *p, struct sip_request *req);
1446 static int handle_request_options(struct sip_pvt *p, struct sip_request *req);
1447 static int handle_invite_replaces(struct sip_pvt *p, struct sip_request *req, int debug, int ignore, int seqno, struct sockaddr_in *sin);
1448 static int handle_request_notify(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int seqno, char *e);
1449 static int handle_invite_replaces(struct sip_pvt *p, struct sip_request *req, int debug, int ignore, int seqno, struct sockaddr_in *sin);
1450 static int local_attended_transfer(struct sip_pvt *transferer, struct sip_dual *current, struct sip_request *req, int seqno);
1452 /*------Response handling functions */
1453 static void handle_response_invite(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int seqno);
1454 static void handle_response_refer(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int seqno);
1455 static int handle_response_peerpoke(struct sip_pvt *p, int resp, struct sip_request *req);
1456 static int handle_response_register(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int ignore, int seqno);
1457 static void handle_response(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int ignore, int seqno);
1459 /*----- RTP interface functions */
1460 static int sip_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp, struct ast_rtp *vrtp, int codecs, int nat_active);
1461 static struct ast_rtp *sip_get_rtp_peer(struct ast_channel *chan);
1462 static struct ast_rtp *sip_get_vrtp_peer(struct ast_channel *chan);
1463 static int sip_get_codec(struct ast_channel *chan);
1464 static struct ast_frame *sip_rtp_read(struct ast_channel *ast, struct sip_pvt *p, int *faxdetect);
1466 /*------ T38 Support --------- */
1467 static int sip_handle_t38_reinvite(struct ast_channel *chan, struct sip_pvt *pvt, int reinvite); /*!< T38 negotiation helper function */
1468 static int transmit_response_with_t38_sdp(struct sip_pvt *p, char *msg, struct sip_request *req, int retrans);
1469 static int transmit_reinvite_with_t38_sdp(struct sip_pvt *p);
1470 static struct ast_udptl *sip_get_udptl_peer(struct ast_channel *chan);
1471 static int sip_set_udptl_peer(struct ast_channel *chan, struct ast_udptl *udptl);
1473 /*! \brief Definition of this channel for PBX channel registration */
1474 static const struct ast_channel_tech sip_tech = {
1476 .description = "Session Initiation Protocol (SIP)",
1477 .capabilities = ((AST_FORMAT_MAX_AUDIO << 1) - 1),
1478 .properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
1479 .requester = sip_request_call,
1480 .devicestate = sip_devicestate,
1482 .hangup = sip_hangup,
1483 .answer = sip_answer,
1486 .write_video = sip_write,
1487 .indicate = sip_indicate,
1488 .transfer = sip_transfer,
1490 .send_digit = sip_senddigit,
1491 .bridge = ast_rtp_bridge,
1492 .send_text = sip_sendtext,
1495 /**--- some list management macros. **/
1497 #define UNLINK(element, head, prev) do { \
1499 (prev)->next = (element)->next; \
1501 (head) = (element)->next; \
1504 /*! \brief Interface structure with callbacks used to connect to RTP module */
1505 static struct ast_rtp_protocol sip_rtp = {
1507 get_rtp_info: sip_get_rtp_peer,
1508 get_vrtp_info: sip_get_vrtp_peer,
1509 set_rtp_peer: sip_set_rtp_peer,
1510 get_codec: sip_get_codec,
1513 /*! \brief Interface structure with callbacks used to connect to UDPTL module*/
1514 static struct ast_udptl_protocol sip_udptl = {
1516 get_udptl_info: sip_get_udptl_peer,
1517 set_udptl_peer: sip_set_udptl_peer,
1520 /*! \brief Convert transfer status to string */
1521 static char *referstatus2str(enum referstatus rstatus)
1523 int i = (sizeof(referstatusstrings) / sizeof(referstatusstrings[0]));
1526 for (x = 0; x < i; x++) {
1527 if (referstatusstrings[x].status == rstatus)
1528 return (char *) referstatusstrings[x].text;
1533 /*! \brief Initialize the initital request packet in the pvt structure.
1534 This packet is used for creating replies and future requests in
1536 static void initialize_initreq(struct sip_pvt *p, struct sip_request *req)
1538 if (p->initreq.headers) {
1539 ast_log(LOG_DEBUG, "Initializing already initialized SIP dialog %s (presumably reinvite)\n", p->callid);
1541 /* Use this as the basis */
1542 copy_request(&p->initreq, req);
1543 parse_request(&p->initreq);
1544 if (ast_test_flag(req, SIP_PKT_DEBUG))
1545 ast_verbose("%d headers, %d lines\n", p->initreq.headers, p->initreq.lines);
1549 /*! \brief returns true if 'name' (with optional trailing whitespace)
1550 * matches the sip method 'id'.
1551 * Strictly speaking, SIP methods are case SENSITIVE, but we do
1552 * a case-insensitive comparison to be more tolerant.
1553 * following Jon Postel's rule: Be gentle in what you accept, strict with what you send
1555 static int method_match(enum sipmethod id, const char *name)
1557 int len = strlen(sip_methods[id].text);
1558 int l_name = name ? strlen(name) : 0;
1559 /* true if the string is long enough, and ends with whitespace, and matches */
1560 return (l_name >= len && name[len] < 33 &&
1561 !strncasecmp(sip_methods[id].text, name, len));
1564 /*! \brief find_sip_method: Find SIP method from header */
1565 static int find_sip_method(const char *msg)
1569 if (ast_strlen_zero(msg))
1571 for (i = 1; i < (sizeof(sip_methods) / sizeof(sip_methods[0])) && !res; i++) {
1572 if (method_match(i, msg))
1573 res = sip_methods[i].id;
1578 /*! \brief Parse supported header in incoming packet */
1579 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported)
1582 char *temp = ast_strdupa(supported);
1583 unsigned int profile = 0;
1586 if (ast_strlen_zero(supported) )
1589 if (option_debug > 2 && sipdebug)
1590 ast_log(LOG_DEBUG, "Begin: parsing SIP \"Supported: %s\"\n", supported);
1592 for (next = temp; next; next = sep) {
1594 if ( (sep = strchr(next, ',')) != NULL)
1596 next = ast_skip_blanks(next);
1597 if (option_debug > 2 && sipdebug)
1598 ast_log(LOG_DEBUG, "Found SIP option: -%s-\n", next);
1599 for (i=0; i < (sizeof(sip_options) / sizeof(sip_options[0])); i++) {
1600 if (!strcasecmp(next, sip_options[i].text)) {
1601 profile |= sip_options[i].id;
1603 if (option_debug > 2 && sipdebug)
1604 ast_log(LOG_DEBUG, "Matched SIP option: %s\n", next);
1608 if (!found && option_debug > 2 && sipdebug)
1609 ast_log(LOG_DEBUG, "Found no match for SIP option: %s (Please file bug report!)\n", next);
1613 pvt->sipoptions = profile;
1617 /*! \brief See if we pass debug IP filter */
1618 static inline int sip_debug_test_addr(const struct sockaddr_in *addr)
1622 if (debugaddr.sin_addr.s_addr) {
1623 if (((ntohs(debugaddr.sin_port) != 0)
1624 && (debugaddr.sin_port != addr->sin_port))
1625 || (debugaddr.sin_addr.s_addr != addr->sin_addr.s_addr))
1631 /*! \brief The real destination address for a write */
1632 static const struct sockaddr_in *sip_real_dst(const struct sip_pvt *p)
1634 return ast_test_flag(&p->flags[0], SIP_NAT) & SIP_NAT_ROUTE ? &p->recv : &p->sa;
1637 /*! \brief Display SIP nat mode */
1638 static const char *sip_nat_mode(const struct sip_pvt *p)
1640 return ast_test_flag(&p->flags[0], SIP_NAT) & SIP_NAT_ROUTE ? "NAT" : "no NAT";
1643 /*! \brief Test PVT for debugging output */
1644 static inline int sip_debug_test_pvt(struct sip_pvt *p)
1648 return sip_debug_test_addr(sip_real_dst(p));
1651 /*! \brief Transmit SIP message */
1652 static int __sip_xmit(struct sip_pvt *p, char *data, int len)
1655 char iabuf[INET_ADDRSTRLEN];
1656 const struct sockaddr_in *dst = sip_real_dst(p);
1657 res=sendto(sipsock, data, len, 0, (const struct sockaddr *)dst, sizeof(struct sockaddr_in));
1660 ast_log(LOG_WARNING, "sip_xmit of %p (len %d) to %s:%d returned %d: %s\n", data, len, ast_inet_ntoa(iabuf, sizeof(iabuf), dst->sin_addr), ntohs(dst->sin_port), res, strerror(errno));
1665 /*! \brief Build a Via header for a request */
1666 static void build_via(struct sip_pvt *p)
1668 char iabuf[INET_ADDRSTRLEN];
1669 /* Work around buggy UNIDEN UIP200 firmware */
1670 const char *rport = ast_test_flag(&p->flags[0], SIP_NAT) & SIP_NAT_RFC3581 ? ";rport" : "";
1672 /* z9hG4bK is a magic cookie. See RFC 3261 section 8.1.1.7 */
1673 ast_string_field_build(p, via, "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x%s",
1674 ast_inet_ntoa(iabuf, sizeof(iabuf), p->ourip), ourport, p->branch, rport);
1677 /*! \brief NAT fix - decide which IP address to use for ASterisk server?
1679 * Using the localaddr structure built up with localnet statements in sip.conf
1680 * apply it to their address to see if we need to substitute our
1681 * externip or can get away with our internal bindaddr
1683 static enum sip_result ast_sip_ouraddrfor(struct in_addr *them, struct in_addr *us)
1685 struct sockaddr_in theirs, ours;
1687 /* Get our local information */
1688 ast_ouraddrfor(them, us);
1689 theirs.sin_addr = *them;
1690 ours.sin_addr = *us;
1692 if (localaddr && externip.sin_addr.s_addr &&
1693 ast_apply_ha(localaddr, &theirs) &&
1694 !ast_apply_ha(localaddr, &ours)) {
1695 if (externexpire && time(NULL) >= externexpire) {
1696 struct ast_hostent ahp;
1699 externexpire = time(NULL) + externrefresh;
1700 if ((hp = ast_gethostbyname(externhost, &ahp))) {
1701 memcpy(&externip.sin_addr, hp->h_addr, sizeof(externip.sin_addr));
1703 ast_log(LOG_NOTICE, "Warning: Re-lookup of '%s' failed!\n", externhost);
1705 *us = externip.sin_addr;
1707 char iabuf[INET_ADDRSTRLEN];
1708 ast_inet_ntoa(iabuf, sizeof(iabuf), *(struct in_addr *)&them->s_addr);
1709 ast_log(LOG_DEBUG, "Target address %s is not local, substituting externip\n", iabuf);
1711 } else if (bindaddr.sin_addr.s_addr)
1712 *us = bindaddr.sin_addr;
1716 /*! \brief Append to SIP dialog history
1717 \return Always returns 0 */
1718 #define append_history(p, event, fmt , args... ) append_history_full(p, "%-15s " fmt, event, ## args)
1720 static void append_history_full(struct sip_pvt *p, const char *fmt, ...)
1721 __attribute__ ((format (printf, 2, 3)));
1723 /*! \brief Append to SIP dialog history with arg list */
1724 static void append_history_va(struct sip_pvt *p, const char *fmt, va_list ap)
1726 char buf[80], *c = buf; /* max history length */
1727 struct sip_history *hist;
1730 vsnprintf(buf, sizeof(buf), fmt, ap);
1731 strsep(&c, "\r\n"); /* Trim up everything after \r or \n */
1732 l = strlen(buf) + 1;
1733 if (!(hist = ast_calloc(1, sizeof(*hist) + l)))
1735 if (!p->history && !(p->history = ast_calloc(1, sizeof(*p->history)))) {
1739 memcpy(hist->event, buf, l);
1740 AST_LIST_INSERT_TAIL(p->history, hist, list);
1743 /*! \brief Append to SIP dialog history with arg list */
1744 static void append_history_full(struct sip_pvt *p, const char *fmt, ...)
1748 if (!recordhistory || !p)
1751 append_history_va(p, fmt, ap);
1757 /*! \brief Retransmit SIP message if no answer (Called from scheduler) */
1758 static int retrans_pkt(void *data)
1760 struct sip_pkt *pkt = data, *prev, *cur = NULL;
1761 char iabuf[INET_ADDRSTRLEN];
1762 int reschedule = DEFAULT_RETRANS;
1764 /* Lock channel PVT */
1765 ast_mutex_lock(&pkt->owner->lock);
1767 if (pkt->retrans < MAX_RETRANS) {
1769 if (!pkt->timer_t1) { /* Re-schedule using timer_a and timer_t1 */
1770 if (sipdebug && option_debug > 3)
1771 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);
1775 if (sipdebug && option_debug > 3)
1776 ast_log(LOG_DEBUG, "SIP TIMER: Rescheduling retransmission #%d (%d) %s - %d\n", pkt->retransid, pkt->retrans, sip_methods[pkt->method].text, pkt->method);
1780 pkt->timer_a = 2 * pkt->timer_a;
1782 /* For non-invites, a maximum of 4 secs */
1783 siptimer_a = pkt->timer_t1 * pkt->timer_a; /* Double each time */
1784 if (pkt->method != SIP_INVITE && siptimer_a > 4000)
1787 /* Reschedule re-transmit */
1788 reschedule = siptimer_a;
1789 if (option_debug > 3)
1790 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);
1793 if (sip_debug_test_pvt(pkt->owner)) {
1794 const struct sockaddr_in *dst = sip_real_dst(pkt->owner);
1795 ast_verbose("Retransmitting #%d (%s) to %s:%d:\n%s\n---\n",
1796 pkt->retrans, sip_nat_mode(pkt->owner),
1797 ast_inet_ntoa(iabuf, sizeof(iabuf), dst->sin_addr),
1798 ntohs(dst->sin_port), pkt->data);
1801 append_history(pkt->owner, "ReTx", "%d %s", reschedule, pkt->data);
1802 __sip_xmit(pkt->owner, pkt->data, pkt->packetlen);
1803 ast_mutex_unlock(&pkt->owner->lock);
1806 /* Too many retries */
1807 if (pkt->owner && pkt->method != SIP_OPTIONS) {
1808 if (ast_test_flag(pkt, FLAG_FATAL) || sipdebug) /* Tell us if it's critical or if we're debugging */
1809 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");
1811 if ((pkt->method == SIP_OPTIONS) && sipdebug)
1812 ast_log(LOG_WARNING, "Cancelling retransmit of OPTIONs (call id %s) \n", pkt->owner->callid);
1814 append_history(pkt->owner, "MaxRetries", "%s", (ast_test_flag(pkt, FLAG_FATAL)) ? "(Critical)" : "(Non-critical)");
1816 pkt->retransid = -1;
1818 if (ast_test_flag(pkt, FLAG_FATAL)) {
1819 while(pkt->owner->owner && ast_channel_trylock(pkt->owner->owner)) {
1820 ast_mutex_unlock(&pkt->owner->lock); /* SIP_PVT, not channel */
1822 ast_mutex_lock(&pkt->owner->lock);
1824 if (pkt->owner->owner) {
1825 ast_set_flag(&pkt->owner->flags[0], SIP_ALREADYGONE);
1826 ast_log(LOG_WARNING, "Hanging up call %s - no reply to our critical packet.\n", pkt->owner->callid);
1827 ast_queue_hangup(pkt->owner->owner);
1828 ast_channel_unlock(pkt->owner->owner);
1830 /* If no channel owner, destroy now */
1831 ast_set_flag(&pkt->owner->flags[0], SIP_NEEDDESTROY);
1834 /* In any case, go ahead and remove the packet */
1835 for (prev = NULL, cur = pkt->owner->packets; cur; prev = cur, cur = cur->next) {
1841 prev->next = cur->next;
1843 pkt->owner->packets = cur->next;
1844 ast_mutex_unlock(&pkt->owner->lock);
1848 ast_log(LOG_WARNING, "Weird, couldn't find packet owner!\n");
1850 ast_mutex_unlock(&pkt->owner->lock);
1854 /*! \brief Transmit packet with retransmits
1855 \return 0 on success, -1 on failure to allocate packet
1857 static enum sip_result __sip_reliable_xmit(struct sip_pvt *p, int seqno, int resp, char *data, int len, int fatal, int sipmethod)
1859 struct sip_pkt *pkt;
1860 int siptimer_a = DEFAULT_RETRANS;
1862 if (!(pkt = ast_calloc(1, sizeof(*pkt) + len + 1)))
1864 memcpy(pkt->data, data, len);
1865 pkt->method = sipmethod;
1866 pkt->packetlen = len;
1867 pkt->next = p->packets;
1871 pkt->data[len] = '\0';
1872 pkt->timer_t1 = p->timer_t1; /* Set SIP timer T1 */
1874 ast_set_flag(pkt, FLAG_FATAL);
1876 siptimer_a = pkt->timer_t1 * 2;
1878 /* Schedule retransmission */
1879 pkt->retransid = ast_sched_add_variable(sched, siptimer_a, retrans_pkt, pkt, 1);
1880 if (option_debug > 3 && sipdebug)
1881 ast_log(LOG_DEBUG, "*** SIP TIMER: Initalizing retransmit timer on packet: Id #%d\n", pkt->retransid);
1882 pkt->next = p->packets;
1885 __sip_xmit(pkt->owner, pkt->data, pkt->packetlen); /* Send packet */
1886 if (sipmethod == SIP_INVITE) {
1887 /* Note this is a pending invite */
1888 p->pendinginvite = seqno;
1893 /*! \brief Kill a SIP dialog (called by scheduler) */
1894 static int __sip_autodestruct(void *data)
1896 struct sip_pvt *p = data;
1898 /* If this is a subscription, tell the phone that we got a timeout */
1899 if (p->subscribed) {
1900 p->subscribed = TIMEOUT;
1901 transmit_state_notify(p, AST_EXTENSION_DEACTIVATED, 1); /* Send last notification */
1902 p->subscribed = NONE;
1903 append_history(p, "Subscribestatus", "timeout");
1904 if (option_debug > 2)
1905 ast_log(LOG_DEBUG, "Re-scheduled destruction of SIP subsription %s\n", p->callid ? p->callid : "<unknown>");
1906 return 10000; /* Reschedule this destruction so that we know that it's gone */
1909 /* Reset schedule ID */
1913 ast_log(LOG_DEBUG, "Auto destroying call '%s'\n", p->callid);
1914 append_history(p, "AutoDestroy", "%s", p->callid);
1916 ast_log(LOG_WARNING, "Autodestruct on dialog '%s' with owner in place (Method: %s)\n", p->callid, sip_methods[p->method].text);
1917 ast_queue_hangup(p->owner);
1918 } else if (p->refer) {
1919 transmit_request_with_auth(p, SIP_BYE, 0, XMIT_RELIABLE, 1);
1926 /*! \brief Schedule destruction of SIP call */
1927 static void sip_scheddestroy(struct sip_pvt *p, int ms)
1929 if (sip_debug_test_pvt(p))
1930 ast_verbose("Scheduling destruction of SIP dialog '%s' in %d ms (Method: %s)\n", p->callid, ms, sip_methods[p->method].text);
1932 append_history(p, "SchedDestroy", "%d ms", ms);
1934 if (p->autokillid > -1)
1935 ast_sched_del(sched, p->autokillid);
1936 p->autokillid = ast_sched_add(sched, ms, __sip_autodestruct, p);
1939 /*! \brief Cancel destruction of SIP dialog */
1940 static void sip_cancel_destroy(struct sip_pvt *p)
1942 if (p->autokillid > -1) {
1943 ast_sched_del(sched, p->autokillid);
1944 append_history(p, "CancelDestroy", "");
1949 /*! \brief Acknowledges receipt of a packet and stops retransmission */
1950 static void __sip_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod, int reset)
1952 struct sip_pkt *cur, *prev = NULL;
1954 /* Just in case... */
1958 msg = sip_methods[sipmethod].text;
1960 ast_mutex_lock(&p->lock);
1961 for (cur = p->packets; cur; prev = cur, cur = cur->next) {
1962 if ((cur->seqno == seqno) && ((ast_test_flag(cur, FLAG_RESPONSE)) == resp) &&
1963 ((ast_test_flag(cur, FLAG_RESPONSE)) ||
1964 (!strncasecmp(msg, cur->data, strlen(msg)) && (cur->data[strlen(msg)] < 33)))) {
1965 if (!resp && (seqno == p->pendinginvite)) {
1966 ast_log(LOG_DEBUG, "Acked pending invite %d\n", p->pendinginvite);
1967 p->pendinginvite = 0;
1969 /* this is our baby */
1971 UNLINK(cur, p->packets, prev);
1972 if (cur->retransid > -1) {
1973 if (sipdebug && option_debug > 3)
1974 ast_log(LOG_DEBUG, "** SIP TIMER: Cancelling retransmit of packet (reply received) Retransid #%d\n", cur->retransid);
1975 ast_sched_del(sched, cur->retransid);
1982 ast_mutex_unlock(&p->lock);
1984 ast_log(LOG_DEBUG, "Stopping retransmission on '%s' of %s %d: Match %s\n", p->callid, resp ? "Response" : "Request", seqno, res ? "Not Found" : "Found");
1987 /*! \brief Pretend to ack all packets
1988 * maybe the lock on p is not strictly necessary but there might be a race */
1989 static void __sip_pretend_ack(struct sip_pvt *p)
1991 struct sip_pkt *cur = NULL;
1993 while (p->packets) {
1995 if (cur == p->packets) {
1996 ast_log(LOG_WARNING, "Have a packet that doesn't want to give up! %s\n", sip_methods[cur->method].text);
2000 method = (cur->method) ? cur->method : find_sip_method(cur->data);
2001 __sip_ack(p, cur->seqno, ast_test_flag(cur, FLAG_RESPONSE), method, FALSE);
2005 /*! \brief Acks receipt of packet, keep it around (used for provisional responses) */
2006 static int __sip_semi_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod)
2008 struct sip_pkt *cur;
2011 for (cur = p->packets; cur; cur = cur->next) {
2012 if (cur->seqno == seqno && ast_test_flag(cur, FLAG_RESPONSE) == resp &&
2013 (ast_test_flag(cur, FLAG_RESPONSE) || method_match(sipmethod, cur->data))) {
2014 /* this is our baby */
2015 if (cur->retransid > -1) {
2016 if (option_debug > 3 && sipdebug)
2017 ast_log(LOG_DEBUG, "*** SIP TIMER: Cancelling retransmission #%d - %s (got response)\n", cur->retransid, sip_methods[sipmethod].text);
2018 ast_sched_del(sched, cur->retransid);
2020 cur->retransid = -1;
2026 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");
2031 /*! \brief Copy SIP request, parse it */
2032 static void parse_copy(struct sip_request *dst, const struct sip_request *src)
2034 memset(dst, 0, sizeof(*dst));
2035 memcpy(dst->data, src->data, sizeof(dst->data));
2036 dst->len = src->len;
2040 /* add a blank line if no body */
2041 static void add_blank(struct sip_request *req)
2044 /* Add extra empty return. add_header() reserves 4 bytes so cannot be truncated */
2045 snprintf(req->data + req->len, sizeof(req->data) - req->len, "\r\n");
2046 req->len += strlen(req->data + req->len);
2050 /*! \brief Transmit response on SIP request*/
2051 static int send_response(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno)
2056 if (sip_debug_test_pvt(p)) {
2057 char iabuf[INET_ADDRSTRLEN];
2058 const struct sockaddr_in *dst = sip_real_dst(p);
2060 ast_verbose("%sTransmitting (%s) to %s:%d:\n%s\n---\n",
2061 reliable ? "Reliably " : "", sip_nat_mode(p),
2062 ast_inet_ntoa(iabuf, sizeof(iabuf), dst->sin_addr),
2063 ntohs(dst->sin_port), req->data);
2065 if (recordhistory) {
2066 struct sip_request tmp;
2067 parse_copy(&tmp, req);
2068 append_history(p, reliable ? "TxRespRel" : "TxResp", "%s / %s - %s", tmp.data, get_header(&tmp, "CSeq"),
2069 tmp.method == SIP_RESPONSE ? tmp.rlPart2 : sip_methods[tmp.method].text);
2072 __sip_reliable_xmit(p, seqno, 1, req->data, req->len, (reliable == XMIT_CRITICAL), req->method) :
2073 __sip_xmit(p, req->data, req->len);
2079 /*! \brief Send SIP Request to the other part of the dialogue */
2080 static int send_request(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno)
2085 if (sip_debug_test_pvt(p)) {
2086 char iabuf[INET_ADDRSTRLEN];
2087 if (ast_test_flag(&p->flags[0], SIP_NAT_ROUTE))
2088 ast_verbose("%sTransmitting (NAT) to %s:%d:\n%s\n---\n", reliable ? "Reliably " : "", ast_inet_ntoa(iabuf, sizeof(iabuf), p->recv.sin_addr), ntohs(p->recv.sin_port), req->data);
2090 ast_verbose("%sTransmitting (no NAT) to %s:%d:\n%s\n---\n", reliable ? "Reliably " : "", ast_inet_ntoa(iabuf, sizeof(iabuf), p->sa.sin_addr), ntohs(p->sa.sin_port), req->data);
2092 if (recordhistory) {
2093 struct sip_request tmp;
2094 parse_copy(&tmp, req);
2095 append_history(p, reliable ? "TxReqRel" : "TxReq", "%s / %s - %s", tmp.data, get_header(&tmp, "CSeq"), sip_methods[tmp.method].text);
2098 __sip_reliable_xmit(p, seqno, 0, req->data, req->len, (reliable > 1), req->method) :
2099 __sip_xmit(p, req->data, req->len);
2103 /*! \brief Pick out text in brackets from character string
2104 \return pointer to terminated stripped string
2105 \param tmp input string that will be modified */
2106 static char *get_in_brackets(char *tmp)
2110 char *first_bracket;
2111 char *second_bracket;
2116 first_quote = strchr(parse, '"');
2117 first_bracket = strchr(parse, '<');
2118 if (first_quote && first_bracket && (first_quote < first_bracket)) {
2120 for (parse = first_quote + 1; *parse; parse++) {
2121 if ((*parse == '"') && (last_char != '\\'))
2126 ast_log(LOG_WARNING, "No closing quote found in '%s'\n", tmp);
2132 if (first_bracket) {
2133 second_bracket = strchr(first_bracket + 1, '>');
2134 if (second_bracket) {
2135 *second_bracket = '\0';
2136 return first_bracket + 1;
2138 ast_log(LOG_WARNING, "No closing bracket found in '%s'\n", tmp);
2146 /*! \brief Send SIP MESSAGE text within a call
2147 Called from PBX core sendtext() application */
2148 static int sip_sendtext(struct ast_channel *ast, const char *text)
2150 struct sip_pvt *p = ast->tech_pvt;
2151 int debug = sip_debug_test_pvt(p);
2154 ast_verbose("Sending text %s on %s\n", text, ast->name);
2157 if (ast_strlen_zero(text))
2160 ast_verbose("Really sending text %s on %s\n", text, ast->name);
2161 transmit_message_with_text(p, text);
2165 /*! \brief Update peer object in realtime storage */
2166 static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, const char *username, const char *fullcontact, int expirey)
2170 char regseconds[20];
2171 time_t nowtime = time(NULL) + expirey;
2172 const char *fc = fullcontact ? "fullcontact" : NULL;
2174 snprintf(regseconds, sizeof(regseconds), "%d", (int)nowtime); /* Expiration time */
2175 ast_inet_ntoa(ipaddr, sizeof(ipaddr), sin->sin_addr);
2176 snprintf(port, sizeof(port), "%d", ntohs(sin->sin_port));
2178 ast_update_realtime("sippeers", "name", peername, "ipaddr", ipaddr,
2179 "port", port, "regseconds", regseconds,
2180 "username", username, fc, fullcontact, NULL); /* note fc _can_ be NULL */
2183 /*! \brief Automatically add peer extension to dial plan */
2184 static void register_peer_exten(struct sip_peer *peer, int onoff)
2187 char *stringp, *ext, *context;
2189 /* XXX note that global_regcontext is both a global 'enable' flag and
2190 * the name of the global regexten context, if not specified
2193 if (ast_strlen_zero(global_regcontext))
2196 ast_copy_string(multi, S_OR(peer->regexten, peer->name), sizeof(multi));
2198 while ((ext = strsep(&stringp, "&"))) {
2199 if ((context = strchr(ext, '@'))) {
2200 *context++ = '\0'; /* split ext@context */
2201 if (!ast_context_find(context)) {
2202 ast_log(LOG_WARNING, "Context %s must exist in regcontext= in sip.conf!\n", context);
2206 context = global_regcontext;
2209 ast_add_extension(context, 1, ext, 1, NULL, NULL, "Noop",
2210 ast_strdup(peer->name), free, "SIP");
2212 ast_context_remove_extension(context, ext, 1, NULL);
2216 /*! \brief Destroy peer object from memory */
2217 static void sip_destroy_peer(struct sip_peer *peer)
2219 if (option_debug > 2)
2220 ast_log(LOG_DEBUG, "Destroying SIP peer %s\n", peer->name);
2222 /* Delete it, it needs to disappear */
2224 sip_destroy(peer->call);
2226 if (peer->mwipvt) { /* We have an active subscription, delete it */
2227 sip_destroy(peer->mwipvt);
2230 if (peer->chanvars) {
2231 ast_variables_destroy(peer->chanvars);
2232 peer->chanvars = NULL;
2234 if (peer->expire > -1)
2235 ast_sched_del(sched, peer->expire);
2236 if (peer->pokeexpire > -1)
2237 ast_sched_del(sched, peer->pokeexpire);
2238 register_peer_exten(peer, FALSE);
2239 ast_free_ha(peer->ha);
2240 if (ast_test_flag(&peer->flags[1], SIP_PAGE2_SELFDESTRUCT))
2242 else if (ast_test_flag(&peer->flags[0], SIP_REALTIME))
2246 clear_realm_authentication(peer->auth);
2249 ast_dnsmgr_release(peer->dnsmgr);
2253 /*! \brief Update peer data in database (if used) */
2254 static void update_peer(struct sip_peer *p, int expiry)
2256 int rtcachefriends = ast_test_flag(&p->flags[1], SIP_PAGE2_RTCACHEFRIENDS);
2257 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTUPDATE) &&
2258 (ast_test_flag(&p->flags[0], SIP_REALTIME) || rtcachefriends)) {
2259 realtime_update_peer(p->name, &p->addr, p->username, rtcachefriends ? p->fullcontact : NULL, expiry);
2264 /*! \brief realtime_peer: Get peer from realtime storage
2265 * Checks the "sippeers" realtime family from extconfig.conf
2266 * \todo Consider adding check of port address when matching here to follow the same
2267 * algorithm as for static peers. Will we break anything by adding that?
2269 static struct sip_peer *realtime_peer(const char *newpeername, struct sockaddr_in *sin)
2271 struct sip_peer *peer;
2272 struct ast_variable *var = NULL;
2273 struct ast_variable *tmp;
2276 /* First check on peer name */
2278 var = ast_load_realtime("sippeers", "name", newpeername, NULL);
2279 else if (sin) { /* Then check on IP address for dynamic peers */
2280 ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr);
2281 var = ast_load_realtime("sippeers", "host", iabuf, NULL); /* First check for fixed IP hosts */
2283 var = ast_load_realtime("sippeers", "ipaddr", iabuf, NULL); /* Then check for registred hosts */
2290 for (tmp = var; tmp; tmp = tmp->next) {
2291 /* If this is type=user, then skip this object. */
2292 if (!strcasecmp(tmp->name, "type") &&
2293 !strcasecmp(tmp->value, "user")) {
2294 ast_variables_destroy(var);
2296 } else if (!newpeername && !strcasecmp(tmp->name, "name")) {
2297 newpeername = tmp->value;
2301 if (!newpeername) { /* Did not find peer in realtime */
2302 ast_log(LOG_WARNING, "Cannot Determine peer name ip=%s\n", iabuf);
2303 ast_variables_destroy(var);
2307 /* Peer found in realtime, now build it in memory */
2308 peer = build_peer(newpeername, var, !ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS));
2310 ast_variables_destroy(var);
2314 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS)) {
2316 ast_copy_flags(&peer->flags[1],&global_flags[1], SIP_PAGE2_RTAUTOCLEAR|SIP_PAGE2_RTCACHEFRIENDS);
2317 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTAUTOCLEAR)) {
2318 if (peer->expire > -1) {
2319 ast_sched_del(sched, peer->expire);
2321 peer->expire = ast_sched_add(sched, (global_rtautoclear) * 1000, expire_register, (void *)peer);
2323 ASTOBJ_CONTAINER_LINK(&peerl,peer);
2325 ast_set_flag(&peer->flags[0], SIP_REALTIME);
2327 ast_variables_destroy(var);
2332 /*! \brief Support routine for find_peer */
2333 static int sip_addrcmp(char *name, struct sockaddr_in *sin)
2335 /* We know name is the first field, so we can cast */
2336 struct sip_peer *p = (struct sip_peer *) name;
2337 return !(!inaddrcmp(&p->addr, sin) ||
2338 (ast_test_flag(&p->flags[0], SIP_INSECURE_PORT) &&
2339 (p->addr.sin_addr.s_addr == sin->sin_addr.s_addr)));
2342 /*! \brief Locate peer by name or ip address
2343 * This is used on incoming SIP message to find matching peer on ip
2344 or outgoing message to find matching peer on name */
2345 static struct sip_peer *find_peer(const char *peer, struct sockaddr_in *sin, int realtime)
2347 struct sip_peer *p = NULL;
2350 p = ASTOBJ_CONTAINER_FIND(&peerl, peer);
2352 p = ASTOBJ_CONTAINER_FIND_FULL(&peerl, sin, name, sip_addr_hashfunc, 1, sip_addrcmp);
2354 if (!p && realtime) {
2355 p = realtime_peer(peer, sin);
2360 /*! \brief Remove user object from in-memory storage */
2361 static void sip_destroy_user(struct sip_user *user)
2363 if (option_debug > 2)
2364 ast_log(LOG_DEBUG, "Destroying user object from memory: %s\n", user->name);
2365 ast_free_ha(user->ha);
2366 if (user->chanvars) {
2367 ast_variables_destroy(user->chanvars);
2368 user->chanvars = NULL;
2370 if (ast_test_flag(&user->flags[0], SIP_REALTIME))
2377 /*! \brief Load user from realtime storage
2378 * Loads user from "sipusers" category in realtime (extconfig.conf)
2379 * Users are matched on From: user name (the domain in skipped) */
2380 static struct sip_user *realtime_user(const char *username)
2382 struct ast_variable *var;
2383 struct ast_variable *tmp;
2384 struct sip_user *user = NULL;
2386 var = ast_load_realtime("sipusers", "name", username, NULL);
2391 for (tmp = var; tmp; tmp = tmp->next) {
2392 if (!strcasecmp(tmp->name, "type") &&
2393 !strcasecmp(tmp->value, "peer")) {
2394 ast_variables_destroy(var);
2399 user = build_user(username, var, !ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS));
2401 if (!user) { /* No user found */
2402 ast_variables_destroy(var);
2406 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS)) {
2407 ast_set_flag(&user->flags[1], SIP_PAGE2_RTCACHEFRIENDS);
2409 ASTOBJ_CONTAINER_LINK(&userl,user);
2411 /* Move counter from s to r... */
2414 ast_set_flag(&user->flags[0], SIP_REALTIME);
2416 ast_variables_destroy(var);
2420 /*! \brief Locate user by name
2421 * Locates user by name (From: sip uri user name part) first
2422 * from in-memory list (static configuration) then from
2423 * realtime storage (defined in extconfig.conf) */
2424 static struct sip_user *find_user(const char *name, int realtime)
2426 struct sip_user *u = ASTOBJ_CONTAINER_FIND(&userl, name);
2428 u = realtime_user(name);
2432 /*! \brief Create address structure from peer reference.
2433 * return -1 on error, 0 on success.
2435 static int create_addr_from_peer(struct sip_pvt *r, struct sip_peer *peer)
2439 if ((peer->addr.sin_addr.s_addr || peer->defaddr.sin_addr.s_addr) &&
2440 (!peer->maxms || ((peer->lastms >= 0) && (peer->lastms <= peer->maxms)))) {
2441 r->sa = (peer->addr.sin_addr.s_addr) ? peer->addr : peer->defaddr;
2447 ast_copy_flags(&r->flags[0], &peer->flags[0], SIP_FLAGS_TO_COPY);
2448 ast_copy_flags(&r->flags[1], &peer->flags[1], SIP_PAGE2_FLAGS_TO_COPY);
2449 r->capability = peer->capability;
2450 if (!ast_test_flag(&r->flags[1], SIP_PAGE2_VIDEOSUPPORT) && r->vrtp) {
2451 ast_rtp_destroy(r->vrtp);
2454 r->prefs = peer->prefs;
2455 if (ast_test_flag(&r->flags[1], SIP_PAGE2_T38SUPPORT)) {
2456 r->t38.capability = global_t38_capability;
2458 if (ast_udptl_get_error_correction_scheme(r->udptl) == UDPTL_ERROR_CORRECTION_FEC )
2459 r->t38.capability |= T38FAX_UDP_EC_FEC;
2460 else if (ast_udptl_get_error_correction_scheme(r->udptl) == UDPTL_ERROR_CORRECTION_REDUNDANCY )
2461 r->t38.capability |= T38FAX_UDP_EC_REDUNDANCY;
2462 else if (ast_udptl_get_error_correction_scheme(r->udptl) == UDPTL_ERROR_CORRECTION_NONE )
2463 r->t38.capability |= T38FAX_UDP_EC_NONE;
2464 r->t38.capability |= T38FAX_RATE_MANAGEMENT_TRANSFERED_TCF;
2465 if (option_debug > 1)
2466 ast_log(LOG_DEBUG,"Our T38 capability (%d)\n", r->t38.capability);
2468 r->t38.jointcapability = r->t38.capability;
2469 } else if (r->udptl) {
2470 ast_udptl_destroy(r->udptl);
2473 natflags = ast_test_flag(&r->flags[0], SIP_NAT) & SIP_NAT_ROUTE;
2476 ast_log(LOG_DEBUG, "Setting NAT on RTP to %s\n", natflags ? "On" : "Off");
2477 ast_rtp_setnat(r->rtp, natflags);
2478 ast_rtp_setdtmf(r->rtp, ast_test_flag(&r->flags[0], SIP_DTMF) != SIP_DTMF_INFO);
2482 ast_log(LOG_DEBUG, "Setting NAT on VRTP to %s\n", natflags ? "On" : "Off");
2483 ast_rtp_setnat(r->vrtp, natflags);
2484 ast_rtp_setdtmf(r->vrtp, 0);
2488 ast_log(LOG_DEBUG, "Setting NAT on UDPTL to %s\n", natflags ? "On" : "Off");
2489 ast_udptl_setnat(r->udptl, natflags);
2491 ast_string_field_set(r, peername, peer->username);
2492 ast_string_field_set(r, authname, peer->username);
2493 ast_string_field_set(r, username, peer->username);
2494 ast_string_field_set(r, peersecret, peer->secret);
2495 ast_string_field_set(r, peermd5secret, peer->md5secret);
2496 ast_string_field_set(r, tohost, peer->tohost);
2497 ast_string_field_set(r, fullcontact, peer->fullcontact);
2498 if (!r->initreq.headers && !ast_strlen_zero(peer->fromdomain)) {
2501 tmpcall = ast_strdupa(r->callid);
2502 c = strchr(tmpcall, '@');
2505 ast_string_field_build(r, callid, "%s@%s", tmpcall, peer->fromdomain);
2508 if (ast_strlen_zero(r->tohost)) {
2509 char iabuf[INET_ADDRSTRLEN];
2511 ast_inet_ntoa(iabuf, sizeof(iabuf), r->sa.sin_addr);
2512 ast_string_field_set(r, tohost, iabuf);
2514 if (!ast_strlen_zero(peer->fromdomain))
2515 ast_string_field_set(r, fromdomain, peer->fromdomain);
2516 if (!ast_strlen_zero(peer->fromuser))
2517 ast_string_field_set(r, fromuser, peer->fromuser);
2518 r->maxtime = peer->maxms;
2519 r->callgroup = peer->callgroup;
2520 r->pickupgroup = peer->pickupgroup;
2521 r->allowtransfer = peer->allowtransfer;
2522 /* Set timer T1 to RTT for this peer (if known by qualify=) */
2523 /* Minimum is settable or default to 100 ms */
2524 if (peer->maxms && peer->lastms)
2525 r->timer_t1 = peer->lastms < global_t1min ? global_t1min : peer->lastms;
2526 if ((ast_test_flag(&r->flags[0], SIP_DTMF) == SIP_DTMF_RFC2833) ||
2527 (ast_test_flag(&r->flags[0], SIP_DTMF) == SIP_DTMF_AUTO))
2528 r->noncodeccapability |= AST_RTP_DTMF;
2530 r->noncodeccapability &= ~AST_RTP_DTMF;
2531 ast_string_field_set(r, context, peer->context);
2532 r->rtptimeout = peer->rtptimeout;
2533 r->rtpholdtimeout = peer->rtpholdtimeout;
2534 r->rtpkeepalive = peer->rtpkeepalive;
2535 if (peer->call_limit)
2536 ast_set_flag(&r->flags[0], SIP_CALL_LIMIT);
2537 r->maxcallbitrate = peer->maxcallbitrate;
2542 /*! \brief create address structure from peer name
2543 * Or, if peer not found, find it in the global DNS
2544 * returns TRUE (-1) on failure, FALSE on success */
2545 static int create_addr(struct sip_pvt *dialog, const char *opeer)
2548 struct ast_hostent ahp;
2552 char host[MAXHOSTNAMELEN], *hostn;
2555 ast_copy_string(peer, opeer, sizeof(peer));
2556 port = strchr(peer, ':');
2559 dialog->sa.sin_family = AF_INET;
2560 dialog->timer_t1 = 500; /* Default SIP retransmission timer T1 (RFC 3261) */
2561 p = find_peer(peer, NULL, 1);
2564 int res = create_addr_from_peer(dialog, p);
2565 ASTOBJ_UNREF(p, sip_destroy_peer);
2569 portno = port ? atoi(port) : DEFAULT_SIP_PORT;
2571 char service[MAXHOSTNAMELEN];
2575 snprintf(service, sizeof(service), "_sip._udp.%s", peer);
2576 ret = ast_get_srv(NULL, host, sizeof(host), &tportno, service);
2582 hp = ast_gethostbyname(hostn, &ahp);
2584 ast_log(LOG_WARNING, "No such host: %s\n", peer);
2587 ast_string_field_set(dialog, tohost, peer);
2588 memcpy(&dialog->sa.sin_addr, hp->h_addr, sizeof(dialog->sa.sin_addr));
2589 dialog->sa.sin_port = htons(portno);
2590 dialog->recv = dialog->sa;
2594 /*! \brief Scheduled congestion on a call */
2595 static int auto_congest(void *nothing)
2597 struct sip_pvt *p = nothing;
2599 ast_mutex_lock(&p->lock);
2602 /* XXX fails on possible deadlock */
2603 if (!ast_channel_trylock(p->owner)) {
2604 ast_log(LOG_NOTICE, "Auto-congesting %s\n", p->owner->name);
2605 append_history(p, "Cong", "Auto-congesting (timer)");
2606 ast_queue_control(p->owner, AST_CONTROL_CONGESTION);
2607 ast_channel_unlock(p->owner);
2610 ast_mutex_unlock(&p->lock);
2615 /*! \brief Initiate SIP call from PBX
2616 * used from the dial() application */
2617 static int sip_call(struct ast_channel *ast, char *dest, int timeout)
2621 struct varshead *headp;
2622 struct ast_var_t *current;
2623 const char *referer = NULL; /* SIP refererer */
2626 if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
2627 ast_log(LOG_WARNING, "sip_call called on %s, neither down nor reserved\n", ast->name);
2631 /* Check whether there is vxml_url, distinctive ring variables */
2632 headp=&ast->varshead;
2633 AST_LIST_TRAVERSE(headp,current,entries) {
2634 /* Check whether there is a VXML_URL variable */
2635 if (!p->options->vxml_url && !strcasecmp(ast_var_name(current), "VXML_URL")) {
2636 p->options->vxml_url = ast_var_value(current);
2637 } else if (!p->options->uri_options && !strcasecmp(ast_var_name(current), "SIP_URI_OPTIONS")) {
2638 p->options->uri_options = ast_var_value(current);
2639 } else if (!p->options->distinctive_ring && !strcasecmp(ast_var_name(current), "ALERT_INFO")) {
2640 /* Check whether there is a ALERT_INFO variable */
2641 p->options->distinctive_ring = ast_var_value(current);
2642 } else if (!p->options->addsipheaders && !strncasecmp(ast_var_name(current), "SIPADDHEADER", strlen("SIPADDHEADER"))) {
2643 /* Check whether there is a variable with a name starting with SIPADDHEADER */
2644 p->options->addsipheaders = 1;
2645 } else if (!strcasecmp(ast_var_name(current),"SIPTRANSFER")) {
2646 /* This is a transfered call */
2647 p->options->transfer = 1;
2648 } else if (!strcasecmp(ast_var_name(current),"SIPTRANSFER_REFERER")) {
2649 /* This is the referer */
2650 referer = ast_var_value(current);
2651 } else if (!strcasecmp(ast_var_name(current),"SIPTRANSFER_REPLACES")) {
2652 /* We're replacing a call. */
2653 p->options->replaces = ast_var_value(current);
2654 } else if (!strcasecmp(ast_var_name(current),"T38CALL")) {
2655 p->t38.state = T38_LOCAL_DIRECT;
2657 ast_log(LOG_DEBUG,"T38State change to %d on channel %s\n", p->t38.state, ast->name);
2663 ast_set_flag(&p->flags[0], SIP_OUTGOING);
2665 if (p->options->transfer) {
2669 if (sipdebug && option_debug > 2)
2670 ast_log(LOG_DEBUG, "Call for %s transfered by %s\n", p->username, referer);
2671 snprintf(buf, sizeof(buf)-1, "-> %s (via %s)", p->cid_name, referer);
2673 snprintf(buf, sizeof(buf)-1, "-> %s", p->cid_name);
2675 ast_string_field_set(p, cid_name, buf);
2678 ast_log(LOG_DEBUG, "Outgoing Call for %s\n", p->username);
2680 res = update_call_counter(p, INC_CALL_RINGING);
2682 p->callingpres = ast->cid.cid_pres;
2683 p->jointcapability = p->capability;
2684 p->t38.jointcapability = p->t38.capability;
2686 ast_log(LOG_DEBUG,"Our T38 capability (%d), joint T38 capability (%d)\n", p->t38.capability, p->t38.jointcapability);
2687 transmit_invite(p, SIP_INVITE, 1, 2);
2689 /* Initialize auto-congest time */
2690 p->initid = ast_sched_add(sched, p->maxtime * 4, auto_congest, p);
2692 p->initid = ast_sched_add(sched, SIP_TRANS_TIMEOUT, auto_congest, p);
2698 /*! \brief Destroy registry object
2699 Objects created with the register= statement in static configuration */
2700 static void sip_registry_destroy(struct sip_registry *reg)
2703 if (option_debug > 2)
2704 ast_log(LOG_DEBUG, "Destroying registry entry for %s@%s\n", reg->username, reg->hostname);
2707 /* Clear registry before destroying to ensure
2708 we don't get reentered trying to grab the registry lock */
2709 reg->call->registry = NULL;
2710 if (option_debug > 2)
2711 ast_log(LOG_DEBUG, "Destroying active SIP dialog for registry %s@%s\n", reg->username, reg->hostname);
2712 sip_destroy(reg->call);
2714 if (reg->expire > -1)
2715 ast_sched_del(sched, reg->expire);
2716 if (reg->timeout > -1)
2717 ast_sched_del(sched, reg->timeout);
2718 ast_string_field_free_all(reg);
2724 /*! \brief Execute destruction of SIP dialog structure, release memory */
2725 static void __sip_destroy(struct sip_pvt *p, int lockowner)
2727 struct sip_pvt *cur, *prev = NULL;
2730 if (sip_debug_test_pvt(p) || option_debug > 2)
2731 ast_verbose("Really destroying SIP dialog '%s' Method: %s\n", p->callid, sip_methods[p->method].text);
2733 /* Remove link from peer to subscription of MWI */
2734 if (p->relatedpeer && p->relatedpeer->mwipvt)
2735 p->relatedpeer->mwipvt = NULL;
2738 sip_dump_history(p);
2743 if (p->stateid > -1)
2744 ast_extension_state_del(p->stateid, NULL);
2746 ast_sched_del(sched, p->initid);
2747 if (p->autokillid > -1)
2748 ast_sched_del(sched, p->autokillid);
2751 ast_rtp_destroy(p->rtp);
2753 ast_rtp_destroy(p->vrtp);
2755 ast_udptl_destroy(p->udptl);
2759 free_old_route(p->route);
2763 if (p->registry->call == p)
2764 p->registry->call = NULL;
2765 ASTOBJ_UNREF(p->registry, sip_registry_destroy);
2768 /* Unlink us from the owner if we have one */
2771 ast_channel_lock(p->owner);
2773 ast_log(LOG_DEBUG, "Detaching from %s\n", p->owner->name);
2774 p->owner->tech_pvt = NULL;
2776 ast_channel_unlock(p->owner);
2780 struct sip_history *hist;
2781 while( (hist = AST_LIST_REMOVE_HEAD(p->history, list)) )
2787 for (prev = NULL, cur = iflist; cur; prev = cur, cur = cur->next) {
2789 UNLINK(cur, iflist, prev);
2794 ast_log(LOG_WARNING, "Trying to destroy \"%s\", not found in dialog list?!?! \n", p->callid);
2798 ast_sched_del(sched, p->initid);
2800 /* remove all current packets in this dialog */
2801 while((cp = p->packets)) {
2802 p->packets = p->packets->next;
2803 if (cp->retransid > -1)
2804 ast_sched_del(sched, cp->retransid);
2808 ast_variables_destroy(p->chanvars);
2811 ast_mutex_destroy(&p->lock);
2813 ast_string_field_free_all(p);
2818 /*! \brief update_call_counter: Handle call_limit for SIP users
2819 * Setting a call-limit will cause calls above the limit not to be accepted.
2821 * Remember that for a type=friend, there's one limit for the user and
2822 * another for the peer, not a combined call limit.
2823 * This will cause unexpected behaviour in subscriptions, since a "friend"
2824 * is *two* devices in Asterisk, not one.
2826 * Thought: For realtime, we should propably update storage with inuse counter...
2828 * \return 0 if call is ok (no call limit, below treshold)
2829 * -1 on rejection of call
2832 static int update_call_counter(struct sip_pvt *fup, int event)
2835 int *inuse, *call_limit, *inringing = NULL;
2836 int outgoing = ast_test_flag(&fup->flags[0], SIP_OUTGOING);
2837 struct sip_user *u = NULL;
2838 struct sip_peer *p = NULL;
2840 if (option_debug > 2)
2841 ast_log(LOG_DEBUG, "Updating call counter for %s call\n", outgoing ? "outgoing" : "incoming");
2842 /* Test if we need to check call limits, in order to avoid
2843 realtime lookups if we do not need it */
2844 if (!ast_test_flag(&fup->flags[0], SIP_CALL_LIMIT))
2847 ast_copy_string(name, fup->username, sizeof(name));
2849 /* Check the list of users */
2850 if (!outgoing) /* Only check users for incoming calls */
2851 u = find_user(name, 1);
2855 call_limit = &u->call_limit;
2858 /* Try to find peer */
2860 p = find_peer(fup->peername, NULL, 1);
2863 call_limit = &p->call_limit;
2864 inringing = &p->inRinging;
2865 ast_copy_string(name, fup->peername, sizeof(name));
2867 if (option_debug > 1)
2868 ast_log(LOG_DEBUG, "%s is not a local device, no call limit\n", name);
2873 /* incoming and outgoing affects the inUse counter */
2874 case DEC_CALL_LIMIT:
2876 if (ast_test_flag(&fup->flags[0], SIP_INC_COUNT))
2882 if (ast_test_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING)) {
2886 ast_log(LOG_WARNING, "Inringing for peer '%s' < 0?\n", fup->peername);
2887 ast_clear_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING);
2890 if (option_debug > 1 || sipdebug) {
2891 ast_log(LOG_DEBUG, "Call %s %s '%s' removed from call limit %d\n", outgoing ? "to" : "from", u ? "user":"peer", name, *call_limit);
2894 case INC_CALL_RINGING:
2895 case INC_CALL_LIMIT:
2896 if (*call_limit > 0 ) {
2897 if (*inuse >= *call_limit) {
2898 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);
2900 ASTOBJ_UNREF(u, sip_destroy_user);
2902 ASTOBJ_UNREF(p, sip_destroy_peer);
2906 if (inringing && (event == INC_CALL_RINGING)) {
2907 if (!ast_test_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING)) {
2909 ast_set_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING);
2914 ast_set_flag(&fup->flags[0], SIP_INC_COUNT);
2915 if (option_debug > 1 || sipdebug) {
2916 ast_log(LOG_DEBUG, "Call %s %s '%s' is %d out of %d\n", outgoing ? "to" : "from", u ? "user":"peer", name, *inuse, *call_limit);
2919 case DEC_CALL_RINGING:
2921 if (ast_test_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING)) {
2925 ast_log(LOG_WARNING, "Inringing for peer '%s' < 0?\n", p->name);
2926 ast_clear_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING);
2931 ast_log(LOG_ERROR, "update_call_counter(%s, %d) called with no event!\n", name, event);
2934 ast_device_state_changed("SIP/%s", p->name);
2936 ASTOBJ_UNREF(u, sip_destroy_user);
2938 ASTOBJ_UNREF(p, sip_destroy_peer);
2942 /*! \brief Destroy SIP call structure */
2943 static void sip_destroy(struct sip_pvt *p)
2945 ast_mutex_lock(&iflock);
2946 if (option_debug > 2)
2947 ast_log(LOG_DEBUG, "Destroying SIP dialog %s\n", p->callid);
2948 __sip_destroy(p, 1);
2949 ast_mutex_unlock(&iflock);
2952 /*! \brief Convert SIP hangup causes to Asterisk hangup causes */
2953 static int hangup_sip2cause(int cause)
2955 /* Possible values taken from causes.h */
2958 case 401: /* Unauthorized */
2959 return AST_CAUSE_CALL_REJECTED;
2960 case 403: /* Not found */
2961 return AST_CAUSE_CALL_REJECTED;
2962 case 404: /* Not found */
2963 return AST_CAUSE_UNALLOCATED;
2964 case 405: /* Method not allowed */
2965 return AST_CAUSE_INTERWORKING;
2966 case 407: /* Proxy authentication required */
2967 return AST_CAUSE_CALL_REJECTED;
2968 case 408: /* No reaction */
2969 return AST_CAUSE_NO_USER_RESPONSE;
2970 case 409: /* Conflict */
2971 return AST_CAUSE_NORMAL_TEMPORARY_FAILURE;
2972 case 410: /* Gone */
2973 return AST_CAUSE_UNALLOCATED;
2974 case 411: /* Length required */
2975 return AST_CAUSE_INTERWORKING;
2976 case 413: /* Request entity too large */
2977 return AST_CAUSE_INTERWORKING;
2978 case 414: /* Request URI too large */
2979 return AST_CAUSE_INTERWORKING;
2980 case 415: /* Unsupported media type */
2981 return AST_CAUSE_INTERWORKING;
2982 case 420: /* Bad extension */
2983 return AST_CAUSE_NO_ROUTE_DESTINATION;
2984 case 480: /* No answer */
2985 return AST_CAUSE_NO_ANSWER;
2986 case 481: /* No answer */
2987 return AST_CAUSE_INTERWORKING;
2988 case 482: /* Loop detected */
2989 return AST_CAUSE_INTERWORKING;
2990 case 483: /* Too many hops */
2991 return AST_CAUSE_NO_ANSWER;
2992 case 484: /* Address incomplete */
2993 return AST_CAUSE_INVALID_NUMBER_FORMAT;
2994 case 485: /* Ambigous */
2995 return AST_CAUSE_UNALLOCATED;
2996 case 486: /* Busy everywhere */
2997 return AST_CAUSE_BUSY;
2998 case 487: /* Request terminated */
2999 return AST_CAUSE_INTERWORKING;
3000 case 488: /* No codecs approved */
3001 return AST_CAUSE_BEARERCAPABILITY_NOTAVAIL;
3002 case 491: /* Request pending */
3003 return AST_CAUSE_INTERWORKING;
3004 case 493: /* Undecipherable */
3005 return AST_CAUSE_INTERWORKING;
3006 case 500: /* Server internal failure */
3007 return AST_CAUSE_FAILURE;
3008 case 501: /* Call rejected */
3009 return AST_CAUSE_FACILITY_REJECTED;
3011 return AST_CAUSE_DESTINATION_OUT_OF_ORDER;
3012 case 503: /* Service unavailable */
3013 return AST_CAUSE_CONGESTION;
3014 case 504: /* Gateway timeout */
3015 return AST_CAUSE_RECOVERY_ON_TIMER_EXPIRE;
3016 case 505: /* SIP version not supported */
3017 return AST_CAUSE_INTERWORKING;
3018 case 600: /* Busy everywhere */
3019 return AST_CAUSE_USER_BUSY;
3020 case 603: /* Decline */
3021 return AST_CAUSE_CALL_REJECTED;
3022 case 604: /* Does not exist anywhere */
3023 return AST_CAUSE_UNALLOCATED;
3024 case 606: /* Not acceptable */
3025 return AST_CAUSE_BEARERCAPABILITY_NOTAVAIL;