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 /*! 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 subscriptiontype {
265 enum parse_register_result {
266 PARSE_REGISTER_FAILED,
267 PARSE_REGISTER_UPDATE,
268 PARSE_REGISTER_QUERY,
272 static const struct cfsubscription_types {
273 enum subscriptiontype type;
274 const char * const event;
275 const char * const mediatype;
276 const char * const text;
277 } subscription_types[] = {
278 { NONE, "-", "unknown", "unknown" },
279 /* IETF draft: draft-ietf-sipping-dialog-package-05.txt */
280 { DIALOG_INFO_XML, "dialog", "application/dialog-info+xml", "dialog-info+xml" },
281 { CPIM_PIDF_XML, "presence", "application/cpim-pidf+xml", "cpim-pidf+xml" }, /* RFC 3863 */
282 { PIDF_XML, "presence", "application/pidf+xml", "pidf+xml" }, /* RFC 3863 */
283 { XPIDF_XML, "presence", "application/xpidf+xml", "xpidf+xml" }, /* Pre-RFC 3863 with MS additions */
284 { MWI_NOTIFICATION, "message-summary", "application/simple-message-summary", "mwi" } /* RFC 3842: Mailbox notification */
287 /*! \brief SIP Request methods known by Asterisk */
289 SIP_UNKNOWN, /* Unknown response */
290 SIP_RESPONSE, /* Not request, response to outbound request */
296 SIP_PRACK, /* Not supported at all */
301 SIP_UPDATE, /* We can send UPDATE; but not accept it */
304 SIP_PUBLISH, /* Not supported at all */
307 /*! \brief Authentication types - proxy or www authentication
308 \note Endpoints, like Asterisk, should always use WWW authentication to
309 allow multiple authentications in the same call - to the proxy and
317 /*! \brief Authentication result from check_auth* functions */
318 enum check_auth_result {
320 AUTH_CHALLENGE_SENT = 1,
321 AUTH_SECRET_FAILED = -1,
322 AUTH_USERNAME_MISMATCH = -2,
325 AUTH_UNKNOWN_DOMAIN = -5,
328 /* States for outbound registrations (with register= lines in sip.conf */
329 enum sipregistrystate {
330 REG_STATE_UNREGISTERED = 0, /*!< We are not registred */
331 REG_STATE_REGSENT, /*!< Registration request sent */
332 REG_STATE_AUTHSENT, /*!< We have tried to authenticate */
333 REG_STATE_REGISTERED, /*!< Registred and done */
334 REG_STATE_REJECTED, /*!< Registration rejected */
335 REG_STATE_TIMEOUT, /*!< Registration timed out */
336 REG_STATE_NOAUTH, /*!< We have no accepted credentials */
337 REG_STATE_FAILED, /*!< Registration failed after several tries */
341 /*! XXX Note that sip_methods[i].id == i must hold or the code breaks */
342 static const struct cfsip_methods {
344 int need_rtp; /*!< when this is the 'primary' use for a pvt structure, does it need RTP? */
347 { SIP_UNKNOWN, RTP, "-UNKNOWN-" },
348 { SIP_RESPONSE, NO_RTP, "SIP/2.0" },
349 { SIP_REGISTER, NO_RTP, "REGISTER" },
350 { SIP_OPTIONS, NO_RTP, "OPTIONS" },
351 { SIP_NOTIFY, NO_RTP, "NOTIFY" },
352 { SIP_INVITE, RTP, "INVITE" },
353 { SIP_ACK, NO_RTP, "ACK" },
354 { SIP_PRACK, NO_RTP, "PRACK" },
355 { SIP_BYE, NO_RTP, "BYE" },
356 { SIP_REFER, NO_RTP, "REFER" },
357 { SIP_SUBSCRIBE, NO_RTP, "SUBSCRIBE" },
358 { SIP_MESSAGE, NO_RTP, "MESSAGE" },
359 { SIP_UPDATE, NO_RTP, "UPDATE" },
360 { SIP_INFO, NO_RTP, "INFO" },
361 { SIP_CANCEL, NO_RTP, "CANCEL" },
362 { SIP_PUBLISH, NO_RTP, "PUBLISH" }
365 /*! Define SIP option tags, used in Require: and Supported: headers
366 We need to be aware of these properties in the phones to use
367 the replace: header. We should not do that without knowing
368 that the other end supports it...
369 This is nothing we can configure, we learn by the dialog
370 Supported: header on the REGISTER (peer) or the INVITE
372 We are not using many of these today, but will in the future.
373 This is documented in RFC 3261
376 #define NOT_SUPPORTED 0
378 #define SIP_OPT_REPLACES (1 << 0)
379 #define SIP_OPT_100REL (1 << 1)
380 #define SIP_OPT_TIMER (1 << 2)
381 #define SIP_OPT_EARLY_SESSION (1 << 3)
382 #define SIP_OPT_JOIN (1 << 4)
383 #define SIP_OPT_PATH (1 << 5)
384 #define SIP_OPT_PREF (1 << 6)
385 #define SIP_OPT_PRECONDITION (1 << 7)
386 #define SIP_OPT_PRIVACY (1 << 8)
387 #define SIP_OPT_SDP_ANAT (1 << 9)
388 #define SIP_OPT_SEC_AGREE (1 << 10)
389 #define SIP_OPT_EVENTLIST (1 << 11)
390 #define SIP_OPT_GRUU (1 << 12)
391 #define SIP_OPT_TARGET_DIALOG (1 << 13)
393 /*! \brief List of well-known SIP options. If we get this in a require,
394 we should check the list and answer accordingly. */
395 static const struct cfsip_options {
396 int id; /*!< Bitmap ID */
397 int supported; /*!< Supported by Asterisk ? */
398 char * const text; /*!< Text id, as in standard */
399 } sip_options[] = { /* XXX used in 3 places */
400 /* Replaces: header for transfer */
401 { SIP_OPT_REPLACES, SUPPORTED, "replaces" },
402 /* One version of Polycom firmware has the wrong label */
403 { SIP_OPT_REPLACES, SUPPORTED, "replace" },
404 /* RFC3262: PRACK 100% reliability */
405 { SIP_OPT_100REL, NOT_SUPPORTED, "100rel" },
406 /* SIP Session Timers */
407 { SIP_OPT_TIMER, NOT_SUPPORTED, "timer" },
408 /* RFC3959: SIP Early session support */
409 { SIP_OPT_EARLY_SESSION, NOT_SUPPORTED, "early-session" },
410 /* SIP Join header support */
411 { SIP_OPT_JOIN, NOT_SUPPORTED, "join" },
412 /* RFC3327: Path support */
413 { SIP_OPT_PATH, NOT_SUPPORTED, "path" },
414 /* RFC3840: Callee preferences */
415 { SIP_OPT_PREF, NOT_SUPPORTED, "pref" },
416 /* RFC3312: Precondition support */
417 { SIP_OPT_PRECONDITION, NOT_SUPPORTED, "precondition" },
418 /* RFC3323: Privacy with proxies*/
419 { SIP_OPT_PRIVACY, NOT_SUPPORTED, "privacy" },
420 /* RFC4092: Usage of the SDP ANAT Semantics in the SIP */
421 { SIP_OPT_SDP_ANAT, NOT_SUPPORTED, "sdp-anat" },
422 /* RFC3329: Security agreement mechanism */
423 { SIP_OPT_SEC_AGREE, NOT_SUPPORTED, "sec_agree" },
424 /* SIMPLE events: draft-ietf-simple-event-list-07.txt */
425 { SIP_OPT_EVENTLIST, NOT_SUPPORTED, "eventlist" },
426 /* GRUU: Globally Routable User Agent URI's */
427 { SIP_OPT_GRUU, NOT_SUPPORTED, "gruu" },
428 /* Target-dialog: draft-ietf-sip-target-dialog-00.txt */
429 { SIP_OPT_TARGET_DIALOG,NOT_SUPPORTED, "target-dialog" },
433 /*! \brief SIP Methods we support */
434 #define ALLOWED_METHODS "INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY"
436 /*! \brief SIP Extensions we support */
437 #define SUPPORTED_EXTENSIONS "replaces"
440 /* Default values, set and reset in reload_config before reading configuration */
441 /* These are default values in the source. There are other recommended values in the
442 sip.conf.sample for new installations. These may differ to keep backwards compatibility,
443 yet encouraging new behaviour on new installations
445 #define DEFAULT_SIP_PORT 5060 /*!< From RFC 3261 (former 2543) */
446 #define DEFAULT_CONTEXT "default"
447 #define DEFAULT_MUSICCLASS "default"
448 #define DEFAULT_VMEXTEN "asterisk"
449 #define DEFAULT_CALLERID "asterisk"
450 #define DEFAULT_NOTIFYMIME "application/simple-message-summary"
451 #define DEFAULT_MWITIME 10
452 #define DEFAULT_ALLOWGUEST TRUE
453 #define DEFAULT_SRVLOOKUP FALSE /*!< Recommended setting is ON */
454 #define DEFAULT_COMPACTHEADERS FALSE
455 #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. */
456 #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. */
457 #define DEFAULT_TOS_VIDEO 0 /*!< Video packets should be marked as DSCP AF41, but the default is 0 to be compatible with previous versions. */
458 #define DEFAULT_ALLOW_EXT_DOM TRUE
459 #define DEFAULT_REALM "asterisk"
460 #define DEFAULT_NOTIFYRINGING TRUE
461 #define DEFAULT_PEDANTIC FALSE
462 #define DEFAULT_AUTOCREATEPEER FALSE
463 #define DEFAULT_QUALIFY FALSE
464 #define DEFAULT_T1MIN 100 /*!< 100 MS for minimal roundtrip time */
465 #define DEFAULT_MAX_CALL_BITRATE (384) /*!< Max bitrate for video */
466 #ifndef DEFAULT_USERAGENT
467 #define DEFAULT_USERAGENT "Asterisk PBX" /*!< Default Useragent: header unless re-defined in sip.conf */
471 /* Default setttings are used as a channel setting and as a default when
472 configuring devices */
473 static char default_context[AST_MAX_CONTEXT];
474 static char default_subscribecontext[AST_MAX_CONTEXT];
475 static char default_language[MAX_LANGUAGE];
476 static char default_callerid[AST_MAX_EXTENSION];
477 static char default_fromdomain[AST_MAX_EXTENSION];
478 static char default_notifymime[AST_MAX_EXTENSION];
479 static int default_qualify; /*!< Default Qualify= setting */
480 static char default_vmexten[AST_MAX_EXTENSION];
481 static char default_musicclass[MAX_MUSICCLASS]; /*!< Global music on hold class */
482 static int default_maxcallbitrate; /*!< Maximum bitrate for call */
483 static struct ast_codec_pref default_prefs; /*!< Default codec prefs */
485 /* Global settings only apply to the channel */
486 static int global_rtautoclear;
487 static int global_notifyringing; /*!< Send notifications on ringing */
488 static int global_alwaysauthreject; /*!< Send 401 Unauthorized for all failing requests */
489 static int srvlookup; /*!< SRV Lookup on or off. Default is off, RFC behavior is on */
490 static int pedanticsipchecking; /*!< Extra checking ? Default off */
491 static int autocreatepeer; /*!< Auto creation of peers at registration? Default off. */
492 static int global_relaxdtmf; /*!< Relax DTMF */
493 static int global_rtptimeout; /*!< Time out call if no RTP */
494 static int global_rtpholdtimeout;
495 static int global_rtpkeepalive; /*!< Send RTP keepalives */
496 static int global_reg_timeout;
497 static int global_regattempts_max; /*!< Registration attempts before giving up */
498 static int global_allowguest; /*!< allow unauthenticated users/peers to connect? */
499 static int global_allowsubscribe; /*!< Flag for disabling ALL subscriptions, this is FALSE only if all peers are FALSE
500 the global setting is in globals_flags[1] */
501 static int global_mwitime; /*!< Time between MWI checks for peers */
502 static int global_tos_sip; /*!< IP type of service for SIP packets */
503 static int global_tos_audio; /*!< IP type of service for audio RTP packets */
504 static int global_tos_video; /*!< IP type of service for video RTP packets */
505 static int compactheaders; /*!< send compact sip headers */
506 static int recordhistory; /*!< Record SIP history. Off by default */
507 static int dumphistory; /*!< Dump history to verbose before destroying SIP dialog */
508 static char global_realm[MAXHOSTNAMELEN]; /*!< Default realm */
509 static char global_regcontext[AST_MAX_CONTEXT]; /*!< Context for auto-extensions */
510 static char global_useragent[AST_MAX_EXTENSION]; /*!< Useragent for the SIP channel */
511 static int allow_external_domains; /*!< Accept calls to external SIP domains? */
512 static int global_callevents; /*!< Whether we send manager events or not */
513 static int global_t1min; /*!< T1 roundtrip time minimum */
514 static enum transfermodes global_allowtransfer; /*!< SIP Refer restriction scheme */
516 /*! \brief Codecs that we support by default: */
517 static int global_capability = AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_GSM | AST_FORMAT_H263;
518 static int noncodeccapability = AST_RTP_DTMF;
520 /* Object counters */
521 static int suserobjs = 0; /*!< Static users */
522 static int ruserobjs = 0; /*!< Realtime users */
523 static int speerobjs = 0; /*!< Statis peers */
524 static int rpeerobjs = 0; /*!< Realtime peers */
525 static int apeerobjs = 0; /*!< Autocreated peer objects */
526 static int regobjs = 0; /*!< Registry objects */
528 static struct ast_flags global_flags[2] = {{0}}; /*!< global SIP_ flags */
530 AST_MUTEX_DEFINE_STATIC(usecnt_lock);
532 /*! \brief Protect the SIP dialog list (of sip_pvt's) */
533 AST_MUTEX_DEFINE_STATIC(iflock);
535 /*! \brief Protect the monitoring thread, so only one process can kill or start it, and not
536 when it's doing something critical. */
537 AST_MUTEX_DEFINE_STATIC(netlock);
539 AST_MUTEX_DEFINE_STATIC(monlock);
541 AST_MUTEX_DEFINE_STATIC(sip_reload_lock);
543 /*! \brief This is the thread for the monitor which checks for input on the channels
544 which are not currently in use. */
545 static pthread_t monitor_thread = AST_PTHREADT_NULL;
547 static int sip_reloading = FALSE; /*!< Flag for avoiding multiple reloads at the same time */
548 static enum channelreloadreason sip_reloadreason; /*!< Reason for last reload/load of configuration */
550 static struct sched_context *sched; /*!< The scheduling context */
551 static struct io_context *io; /*!< The IO context */
553 #define DEC_CALL_LIMIT 0
554 #define INC_CALL_LIMIT 1
555 #define DEC_CALL_RINGING 2
556 #define INC_CALL_RINGING 3
558 /*! \brief sip_request: The data grabbed from the UDP socket */
560 char *rlPart1; /*!< SIP Method Name or "SIP/2.0" protocol version */
561 char *rlPart2; /*!< The Request URI or Response Status */
562 int len; /*!< Length */
563 int headers; /*!< # of SIP Headers */
564 int method; /*!< Method of this request */
565 int lines; /*!< Body Content */
566 unsigned int flags; /*!< SIP_PKT Flags for this packet */
567 char *header[SIP_MAX_HEADERS];
568 char *line[SIP_MAX_LINES];
569 char data[SIP_MAX_PACKET];
570 unsigned int sdp_start; /*!< the line number where the SDP begins */
571 unsigned int sdp_end; /*!< the line number where the SDP ends */
575 * A sip packet is stored into the data[] buffer, with the header followed
576 * by an empty line and the body of the message.
577 * On outgoing packets, data is accumulated in data[] with len reflecting
578 * the next available byte, headers and lines count the number of lines
579 * in both parts. There are no '\0' in data[0..len-1].
581 * On received packet, the input read from the socket is copied into data[],
582 * len is set and the string is NUL-terminated. Then a parser fills up
583 * the other fields -header[] and line[] to point to the lines of the
584 * message, rlPart1 and rlPart2 parse the first lnie as below:
586 * Requests have in the first line METHOD URI SIP/2.0
587 * rlPart1 = method; rlPart2 = uri;
588 * Responses have in the first line SIP/2.0 code description
589 * rlPart1 = SIP/2.0; rlPart2 = code + description;
593 /*! \brief structure used in transfers */
595 struct ast_channel *chan1; /*!< First channel involved */
596 struct ast_channel *chan2; /*!< Second channel involved */
597 struct sip_request req; /*!< Request that caused the transfer (REFER) */
598 int seqno; /*!< Sequence number */
603 /*! \brief Parameters to the transmit_invite function */
604 struct sip_invite_param {
605 const char *distinctive_ring; /*!< Distinctive ring header */
606 int addsipheaders; /*!< Add extra SIP headers */
607 const char *uri_options; /*!< URI options to add to the URI */
608 const char *vxml_url; /*!< VXML url for Cisco phones */
609 char *auth; /*!< Authentication */
610 char *authheader; /*!< Auth header */
611 enum sip_auth_type auth_type; /*!< Authentication type */
612 const char *replaces; /*!< Replaces header for call transfers */
613 int transfer; /*!< Flag - is this Invite part of a SIP transfer? (invite/replaces) */
616 /*! \brief Structure to save routing information for a SIP session */
618 struct sip_route *next;
622 /*! \brief Modes for SIP domain handling in the PBX */
624 SIP_DOMAIN_AUTO, /*!< This domain is auto-configured */
625 SIP_DOMAIN_CONFIG, /*!< This domain is from configuration */
629 char domain[MAXHOSTNAMELEN]; /*!< SIP domain we are responsible for */
630 char context[AST_MAX_EXTENSION]; /*!< Incoming context for this domain */
631 enum domain_mode mode; /*!< How did we find this domain? */
632 AST_LIST_ENTRY(domain) list; /*!< List mechanics */
635 static AST_LIST_HEAD_STATIC(domain_list, domain); /*!< The SIP domain list */
638 /*! \brief sip_history: Structure for saving transactions within a SIP dialog */
640 AST_LIST_ENTRY(sip_history) list;
641 char event[0]; /* actually more, depending on needs */
644 AST_LIST_HEAD_NOLOCK(sip_history_head, sip_history); /*!< history list, entry in sip_pvt */
646 /*! \brief sip_auth: Creadentials for authentication to other SIP services */
648 char realm[AST_MAX_EXTENSION]; /*!< Realm in which these credentials are valid */
649 char username[256]; /*!< Username */
650 char secret[256]; /*!< Secret */
651 char md5secret[256]; /*!< MD5Secret */
652 struct sip_auth *next; /*!< Next auth structure in list */
655 /*--- Various flags for the flags field in the pvt structure */
656 #define SIP_ALREADYGONE (1 << 0) /*!< Whether or not we've already been destroyed by our peer */
657 #define SIP_NEEDDESTROY (1 << 1) /*!< if we need to be destroyed by the monitor thread */
658 #define SIP_NOVIDEO (1 << 2) /*!< Didn't get video in invite, don't offer */
659 #define SIP_RINGING (1 << 3) /*!< Have sent 180 ringing */
660 #define SIP_PROGRESS_SENT (1 << 4) /*!< Have sent 183 message progress */
661 #define SIP_NEEDREINVITE (1 << 5) /*!< Do we need to send another reinvite? */
662 #define SIP_PENDINGBYE (1 << 6) /*!< Need to send bye after we ack? */
663 #define SIP_GOTREFER (1 << 7) /*!< Got a refer? */
664 #define SIP_PROMISCREDIR (1 << 8) /*!< Promiscuous redirection */
665 #define SIP_TRUSTRPID (1 << 9) /*!< Trust RPID headers? */
666 #define SIP_USEREQPHONE (1 << 10) /*!< Add user=phone to numeric URI. Default off */
667 #define SIP_REALTIME (1 << 11) /*!< Flag for realtime users */
668 #define SIP_USECLIENTCODE (1 << 12) /*!< Trust X-ClientCode info message */
669 #define SIP_OUTGOING (1 << 13) /*!< Is this an outgoing call? */
670 #define SIP_CAN_BYE (1 << 14) /*!< Can we send BYE on this dialog? */
671 #define SIP_DEFER_BYE_ON_TRANSFER (1 << 15) /*!< Do not hangup at first ast_hangup */
672 #define SIP_DTMF (3 << 16) /*!< DTMF Support: four settings, uses two bits */
673 #define SIP_DTMF_RFC2833 (0 << 16) /*!< DTMF Support: RTP DTMF - "rfc2833" */
674 #define SIP_DTMF_INBAND (1 << 16) /*!< DTMF Support: Inband audio, only for ULAW/ALAW - "inband" */
675 #define SIP_DTMF_INFO (2 << 16) /*!< DTMF Support: SIP Info messages - "info" */
676 #define SIP_DTMF_AUTO (3 << 16) /*!< DTMF Support: AUTO switch between rfc2833 and in-band DTMF */
678 #define SIP_NAT (3 << 18) /*!< four settings, uses two bits */
679 #define SIP_NAT_NEVER (0 << 18) /*!< No nat support */
680 #define SIP_NAT_RFC3581 (1 << 18) /*!< NAT RFC3581 */
681 #define SIP_NAT_ROUTE (2 << 18) /*!< NAT Only ROUTE */
682 #define SIP_NAT_ALWAYS (3 << 18) /*!< NAT Both ROUTE and RFC3581 */
683 /* re-INVITE related settings */
684 #define SIP_REINVITE (7 << 20) /*!< three bits used */
685 #define SIP_CAN_REINVITE (1 << 20) /*!< allow peers to be reinvited to send media directly p2p */
686 #define SIP_CAN_REINVITE_NAT (2 << 20) /*!< allow media reinvite when new peer is behind NAT */
687 #define SIP_REINVITE_UPDATE (4 << 20) /*!< use UPDATE (RFC3311) when reinviting this peer */
688 /* "insecure" settings */
689 #define SIP_INSECURE_PORT (1 << 23) /*!< don't require matching port for incoming requests */
690 #define SIP_INSECURE_INVITE (1 << 24) /*!< don't require authentication for incoming INVITEs */
691 /* Sending PROGRESS in-band settings */
692 #define SIP_PROG_INBAND (3 << 25) /*!< three settings, uses two bits */
693 #define SIP_PROG_INBAND_NEVER (0 << 25)
694 #define SIP_PROG_INBAND_NO (1 << 25)
695 #define SIP_PROG_INBAND_YES (2 << 25)
696 #define SIP_CALL_ONHOLD (1 << 27) /*!< Call states */
697 #define SIP_CALL_LIMIT (1 << 28) /*!< Call limit enforced for this call */
698 #define SIP_SENDRPID (1 << 29) /*!< Remote Party-ID Support */
699 #define SIP_INC_COUNT (1 << 30) /*!< Did this connection increment the counter of in-use calls? */
701 #define SIP_FLAGS_TO_COPY \
702 (SIP_PROMISCREDIR | SIP_TRUSTRPID | SIP_SENDRPID | SIP_DTMF | SIP_REINVITE | \
703 SIP_PROG_INBAND | SIP_USECLIENTCODE | SIP_NAT | \
704 SIP_USEREQPHONE | SIP_INSECURE_PORT | SIP_INSECURE_INVITE)
706 /* a new page of flags for peers */
707 #define SIP_PAGE2_RTCACHEFRIENDS (1 << 0)
708 #define SIP_PAGE2_RTUPDATE (1 << 1)
709 #define SIP_PAGE2_RTAUTOCLEAR (1 << 2)
710 #define SIP_PAGE2_IGNOREREGEXPIRE (1 << 3)
711 #define SIP_PAGE2_RT_FROMCONTACT (1 << 4)
712 #define SIP_PAGE2_DEBUG (3 << 5)
713 #define SIP_PAGE2_DEBUG_CONFIG (1 << 5)
714 #define SIP_PAGE2_DEBUG_CONSOLE (1 << 6)
715 #define SIP_PAGE2_DYNAMIC (1 << 7) /*!< Dynamic Peers register with Asterisk */
716 #define SIP_PAGE2_SELFDESTRUCT (1 << 8) /*!< Automatic peers need to destruct themselves */
717 #define SIP_PAGE2_VIDEOSUPPORT (1 << 9)
718 #define SIP_PAGE2_ALLOWSUBSCRIBE (1 << 10) /*!< Allow subscriptions from this peer? */
719 #define SIP_PAGE2_ALLOWOVERLAP (1 << 11) /*!< Allow overlap dialing ? */
720 #define SIP_PAGE2_SUBSCRIBEMWIONLY (1 << 12) /*!< Only issue MWI notification if subscribed to */
721 #define SIP_PAGE2_INC_RINGING (1 << 13) /*!< Did this connection increment the counter of in-use calls? */
722 #define SIP_PAGE2_T38SUPPORT (7 << 14) /*!< T38 Fax Passthrough Support */
723 #define SIP_PAGE2_T38SUPPORT_UDPTL (1 << 14) /*!< 14: T38 Fax Passthrough Support */
724 #define SIP_PAGE2_T38SUPPORT_RTP (2 << 14) /*!< 15: T38 Fax Passthrough Support */
725 #define SIP_PAGE2_T38SUPPORT_TCP (4 << 14) /*!< 16: T38 Fax Passthrough Support */
727 #define SIP_PAGE2_FLAGS_TO_COPY \
728 (SIP_PAGE2_ALLOWSUBSCRIBE | SIP_PAGE2_ALLOWOVERLAP | SIP_PAGE2_VIDEOSUPPORT | SIP_PAGE2_T38SUPPORT)
730 /* SIP packet flags */
731 #define SIP_PKT_DEBUG (1 << 0) /*!< Debug this packet */
732 #define SIP_PKT_WITH_TOTAG (1 << 1) /*!< This packet has a to-tag */
733 #define SIP_PKT_IGNORE (1 << 2) /*!< This is a re-transmit, ignore it */
734 #define SIP_PKT_IGNORE_RESP (1 << 3) /*!< Resp ignore - ??? */
735 #define SIP_PKT_IGNORE_REQ (1 << 4) /*!< Req ignore - ??? */
737 /* T.38 set of flags */
738 #define T38FAX_FILL_BIT_REMOVAL (1 << 0) /*!< Default: 0 (unset)*/
739 #define T38FAX_TRANSCODING_MMR (1 << 1) /*!< Default: 0 (unset)*/
740 #define T38FAX_TRANSCODING_JBIG (1 << 2) /*!< Default: 0 (unset)*/
741 /* Rate management */
742 #define T38FAX_RATE_MANAGEMENT_TRANSFERED_TCF (0 << 3)
743 #define T38FAX_RATE_MANAGEMENT_LOCAL_TCF (1 << 3) /*!< Unset for transferredTCF (UDPTL), set for localTCF (TPKT) */
744 /* UDP Error correction */
745 #define T38FAX_UDP_EC_NONE (0 << 4) /*!< two bits, if unset NO t38UDPEC field in T38 SDP*/
746 #define T38FAX_UDP_EC_FEC (1 << 4) /*!< Set for t38UDPFEC */
747 #define T38FAX_UDP_EC_REDUNDANCY (2 << 4) /*!< Set for t38UDPRedundancy */
748 /* T38 Spec version */
749 #define T38FAX_VERSION (3 << 6) /*!< two bits, 2 values so far, up to 4 values max */
750 #define T38FAX_VERSION_0 (0 << 6) /*!< Version 0 */
751 #define T38FAX_VERSION_1 (1 << 6) /*!< Version 1 */
752 /* Maximum Fax Rate */
753 #define T38FAX_RATE_2400 (1 << 8) /*!< 2400 bps t38FaxRate */
754 #define T38FAX_RATE_4800 (1 << 9) /*!< 4800 bps t38FaxRate */
755 #define T38FAX_RATE_7200 (1 << 10) /*!< 7200 bps t38FaxRate */
756 #define T38FAX_RATE_9600 (1 << 11) /*!< 9600 bps t38FaxRate */
757 #define T38FAX_RATE_12000 (1 << 12) /*!< 12000 bps t38FaxRate */
758 #define T38FAX_RATE_14400 (1 << 13) /*!< 14400 bps t38FaxRate */
760 /*!< This is default: NO MMR and JBIG trancoding, NO fill bit removal, transferredTCF TCF, UDP FEC, Version 0 and 9600 max fax rate */
761 static int global_t38_capability = T38FAX_VERSION_0 | T38FAX_RATE_2400 | T38FAX_RATE_4800 | T38FAX_RATE_7200 | T38FAX_RATE_9600;
763 #define sipdebug ast_test_flag(&global_flags[1], SIP_PAGE2_DEBUG)
764 #define sipdebug_config ast_test_flag(&global_flags[1], SIP_PAGE2_DEBUG_CONFIG)
765 #define sipdebug_console ast_test_flag(&global_flags[1], SIP_PAGE2_DEBUG_CONSOLE)
767 /*! \brief T38 Sates for a call */
769 T38_DISABLED = 0, /*! Not enabled */
770 T38_LOCAL_DIRECT, /*! Offered from local */
771 T38_LOCAL_REINVITE, /*! Offered from local - REINVITE */
772 T38_PEER_DIRECT, /*! Offered from peer */
773 T38_PEER_REINVITE, /*! Offered from peer - REINVITE */
774 T38_ENABLED /*! Negotiated (enabled) */
777 /*! \brief T.38 channel settings (at some point we need to make this alloc'ed */
778 struct t38properties {
779 struct ast_flags t38support; /*!< Flag for udptl, rtp or tcp support for this session */
780 int capability; /*!< Our T38 capability */
781 int peercapability; /*!< Peers T38 capability */
782 int jointcapability; /*!< Supported T38 capability at both ends */
783 enum t38state state; /*!< T.38 state */
786 /*! \brief Parameters to know status of transfer */
788 REFER_IDLE, /*!< No REFER is in progress */
789 REFER_SENT, /*!< Sent REFER to transferee */
790 REFER_RECEIVED, /*!< Received REFER from transferer */
791 REFER_CONFIRMED, /*!< Refer confirmed with a 100 TRYING */
792 REFER_ACCEPTED, /*!< Accepted by transferee */
793 REFER_RINGING, /*!< Target Ringing */
794 REFER_200OK, /*!< Answered by transfer target */
795 REFER_FAILED, /*!< REFER declined - go on */
796 REFER_NOAUTH /*!< We had no auth for REFER */
799 static const struct c_referstatusstring {
800 enum referstatus status;
802 } referstatusstrings[] = {
803 { REFER_IDLE, "<none>" },
804 { REFER_SENT, "Request sent" },
805 { REFER_RECEIVED, "Request received" },
806 { REFER_ACCEPTED, "Accepted" },
807 { REFER_RINGING, "Target ringing" },
808 { REFER_200OK, "Done" },
809 { REFER_FAILED, "Failed" },
810 { REFER_NOAUTH, "Failed - auth failure" }
813 /*! \brief Structure to handle SIP transfers. Dynamically allocated when needed */
814 /* OEJ: Should be moved to string fields */
816 char refer_to[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO extension */
817 char refer_to_domain[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO domain */
818 char refer_to_urioption[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO uri options */
819 char refer_to_context[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO context */
820 char referred_by[AST_MAX_EXTENSION]; /*!< Place to store REFERRED-BY extension */
821 char referred_by_name[AST_MAX_EXTENSION]; /*!< Place to store REFERRED-BY extension */
822 char refer_contact[AST_MAX_EXTENSION]; /*!< Place to store Contact info from a REFER extension */
823 char replaces_callid[BUFSIZ]; /*!< Replace info */
824 char replaces_callid_totag[BUFSIZ/2]; /*!< Replace info */
825 char replaces_callid_fromtag[BUFSIZ/2]; /*!< Replace info */
826 struct sip_pvt *refer_call; /*!< Call we are referring */
827 int attendedtransfer; /*!< Attended or blind transfer? */
828 int localtransfer; /*!< Transfer to local domain? */
829 enum referstatus status; /*!< REFER status */
832 /*! \brief sip_pvt: PVT structures are used for each SIP dialog, ie. a call, a registration, a subscribe */
833 static struct sip_pvt {
834 ast_mutex_t lock; /*!< Dialog private lock */
835 int method; /*!< SIP method that opened this dialog */
836 AST_DECLARE_STRING_FIELDS(
837 AST_STRING_FIELD(callid); /*!< Global CallID */
838 AST_STRING_FIELD(randdata); /*!< Random data */
839 AST_STRING_FIELD(accountcode); /*!< Account code */
840 AST_STRING_FIELD(realm); /*!< Authorization realm */
841 AST_STRING_FIELD(nonce); /*!< Authorization nonce */
842 AST_STRING_FIELD(opaque); /*!< Opaque nonsense */
843 AST_STRING_FIELD(qop); /*!< Quality of Protection, since SIP wasn't complicated enough yet. */
844 AST_STRING_FIELD(domain); /*!< Authorization domain */
845 AST_STRING_FIELD(from); /*!< The From: header */
846 AST_STRING_FIELD(useragent); /*!< User agent in SIP request */
847 AST_STRING_FIELD(exten); /*!< Extension where to start */
848 AST_STRING_FIELD(context); /*!< Context for this call */
849 AST_STRING_FIELD(subscribecontext); /*!< Subscribecontext */
850 AST_STRING_FIELD(subscribeuri); /*!< Subscribecontext */
851 AST_STRING_FIELD(fromdomain); /*!< Domain to show in the from field */
852 AST_STRING_FIELD(fromuser); /*!< User to show in the user field */
853 AST_STRING_FIELD(fromname); /*!< Name to show in the user field */
854 AST_STRING_FIELD(tohost); /*!< Host we should put in the "to" field */
855 AST_STRING_FIELD(language); /*!< Default language for this call */
856 AST_STRING_FIELD(musicclass); /*!< Music on Hold class */
857 AST_STRING_FIELD(rdnis); /*!< Referring DNIS */
858 AST_STRING_FIELD(theirtag); /*!< Their tag */
859 AST_STRING_FIELD(username); /*!< [user] name */
860 AST_STRING_FIELD(peername); /*!< [peer] name, not set if [user] */
861 AST_STRING_FIELD(authname); /*!< Who we use for authentication */
862 AST_STRING_FIELD(uri); /*!< Original requested URI */
863 AST_STRING_FIELD(okcontacturi); /*!< URI from the 200 OK on INVITE */
864 AST_STRING_FIELD(peersecret); /*!< Password */
865 AST_STRING_FIELD(peermd5secret);
866 AST_STRING_FIELD(cid_num); /*!< Caller*ID */
867 AST_STRING_FIELD(cid_name); /*!< Caller*ID */
868 AST_STRING_FIELD(via); /*!< Via: header */
869 AST_STRING_FIELD(fullcontact); /*!< The Contact: that the UA registers with us */
870 AST_STRING_FIELD(our_contact); /*!< Our contact header */
871 AST_STRING_FIELD(rpid); /*!< Our RPID header */
872 AST_STRING_FIELD(rpid_from); /*!< Our RPID From header */
874 struct ast_codec_pref prefs; /*!< codec prefs */
875 unsigned int ocseq; /*!< Current outgoing seqno */
876 unsigned int icseq; /*!< Current incoming seqno */
877 ast_group_t callgroup; /*!< Call group */
878 ast_group_t pickupgroup; /*!< Pickup group */
879 int lastinvite; /*!< Last Cseq of invite */
880 struct ast_flags flags[2]; /*!< SIP_ flags */
881 int timer_t1; /*!< SIP timer T1, ms rtt */
882 unsigned int sipoptions; /*!< Supported SIP sipoptions on the other end */
883 int capability; /*!< Special capability (codec) */
884 int jointcapability; /*!< Supported capability at both ends (codecs ) */
885 int peercapability; /*!< Supported peer capability */
886 int prefcodec; /*!< Preferred codec (outbound only) */
887 int noncodeccapability; /*!< DTMF RFC2833 telephony-event */
888 int redircodecs; /*!< Redirect codecs */
889 int maxcallbitrate; /*!< Maximum Call Bitrate for Video Calls */
890 struct t38properties t38; /*!< T38 settings */
891 struct sockaddr_in udptlredirip; /*!< Where our T.38 UDPTL should be going if not to us */
892 struct ast_udptl *udptl; /*!< T.38 UDPTL session */
893 int callingpres; /*!< Calling presentation */
894 int authtries; /*!< Times we've tried to authenticate */
895 int expiry; /*!< How long we take to expire */
896 long branch; /*!< One random number */
897 char tag[11]; /*!< Another random number */
898 int sessionid; /*!< SDP Session ID */
899 int sessionversion; /*!< SDP Session Version */
900 struct sockaddr_in sa; /*!< Our peer */
901 struct sockaddr_in redirip; /*!< Where our RTP should be going if not to us */
902 struct sockaddr_in vredirip; /*!< Where our Video RTP should be going if not to us */
903 struct sockaddr_in recv; /*!< Received as */
904 struct in_addr ourip; /*!< Our IP */
905 struct ast_channel *owner; /*!< Who owns us */
906 struct sip_route *route; /*!< Head of linked list of routing steps (fm Record-Route) */
907 int route_persistant; /*!< Is this the "real" route? */
908 struct sip_auth *peerauth; /*!< Realm authentication */
909 int noncecount; /*!< Nonce-count */
910 char lastmsg[256]; /*!< Last Message sent/received */
911 int amaflags; /*!< AMA Flags */
912 int pendinginvite; /*!< Any pending invite */
913 struct sip_request initreq; /*!< Initial request that opened the SIP dialog */
915 int maxtime; /*!< Max time for first response */
916 int initid; /*!< Auto-congest ID if appropriate */
917 int autokillid; /*!< Auto-kill ID */
918 time_t lastrtprx; /*!< Last RTP received */
919 time_t lastrtptx; /*!< Last RTP sent */
920 int rtptimeout; /*!< RTP timeout time */
921 int rtpholdtimeout; /*!< RTP timeout when on hold */
922 int rtpkeepalive; /*!< Send RTP packets for keepalive */
923 enum transfermodes allowtransfer; /*! SIP Refer restriction scheme */
924 enum subscriptiontype subscribed; /*!< SUBSCRIBE: Is this dialog a subscription? */
925 int stateid; /*!< SUBSCRIBE: ID for devicestate subscriptions */
926 int laststate; /*!< SUBSCRIBE: Last known extension state */
927 int dialogver; /*!< SUBSCRIBE: Version for subscription dialog-info */
929 struct sip_refer *refer; /*!< REFER: SIP transfer data structure */
930 struct ast_dsp *vad; /*!< Voice Activation Detection dsp */
932 struct sip_peer *relatedpeer; /*!< If this dialog is related to a peer, which one
933 Used in peerpoke, mwi subscriptions */
934 struct sip_registry *registry; /*!< If this is a REGISTER dialog, to which registry */
935 struct ast_rtp *rtp; /*!< RTP Session */
936 struct ast_rtp *vrtp; /*!< Video RTP session */
937 struct sip_pkt *packets; /*!< Packets scheduled for re-transmission */
938 struct sip_history_head *history; /*!< History of this SIP dialog */
939 struct ast_variable *chanvars; /*!< Channel variables to set for inbound call */
940 struct sip_pvt *next; /*!< Next dialog in chain */
941 struct sip_invite_param *options; /*!< Options for INVITE */
944 #define FLAG_RESPONSE (1 << 0)
945 #define FLAG_FATAL (1 << 1)
947 /*! \brief sip packet - raw format for outbound packets that are sent or scheduled for transmission */
949 struct sip_pkt *next; /*!< Next packet in linked list */
950 int retrans; /*!< Retransmission number */
951 int method; /*!< SIP method for this packet */
952 int seqno; /*!< Sequence number */
953 unsigned int flags; /*!< non-zero if this is a response packet (e.g. 200 OK) */
954 struct sip_pvt *owner; /*!< Owner AST call */
955 int retransid; /*!< Retransmission ID */
956 int timer_a; /*!< SIP timer A, retransmission timer */
957 int timer_t1; /*!< SIP Timer T1, estimated RTT or 500 ms */
958 int packetlen; /*!< Length of packet */
962 /*! \brief Structure for SIP user data. User's place calls to us */
964 /* Users who can access various contexts */
965 ASTOBJ_COMPONENTS(struct sip_user);
966 char secret[80]; /*!< Password */
967 char md5secret[80]; /*!< Password in md5 */
968 char context[AST_MAX_CONTEXT]; /*!< Default context for incoming calls */
969 char subscribecontext[AST_MAX_CONTEXT]; /* Default context for subscriptions */
970 char cid_num[80]; /*!< Caller ID num */
971 char cid_name[80]; /*!< Caller ID name */
972 char accountcode[AST_MAX_ACCOUNT_CODE]; /* Account code */
973 char language[MAX_LANGUAGE]; /*!< Default language for this user */
974 char musicclass[MAX_MUSICCLASS];/*!< Music on Hold class */
975 char useragent[256]; /*!< User agent in SIP request */
976 struct ast_codec_pref prefs; /*!< codec prefs */
977 ast_group_t callgroup; /*!< Call group */
978 ast_group_t pickupgroup; /*!< Pickup Group */
979 unsigned int sipoptions; /*!< Supported SIP options */
980 struct ast_flags flags[2]; /*!< SIP_ flags */
981 int amaflags; /*!< AMA flags for billing */
982 int callingpres; /*!< Calling id presentation */
983 int capability; /*!< Codec capability */
984 int inUse; /*!< Number of calls in use */
985 int call_limit; /*!< Limit of concurrent calls */
986 enum transfermodes allowtransfer; /*! SIP Refer restriction scheme */
987 struct ast_ha *ha; /*!< ACL setting */
988 struct ast_variable *chanvars; /*!< Variables to set for channel created by user */
989 int maxcallbitrate; /*!< Maximum Bitrate for a video call */
992 /*! \brief Structure for SIP peer data, we place calls to peers if registered or fixed IP address (host) */
993 /* XXX field 'name' must be first otherwise sip_addrcmp() will fail */
995 ASTOBJ_COMPONENTS(struct sip_peer); /*!< name, refcount, objflags, object pointers */
996 /*!< peer->name is the unique name of this object */
997 char secret[80]; /*!< Password */
998 char md5secret[80]; /*!< Password in MD5 */
999 struct sip_auth *auth; /*!< Realm authentication list */
1000 char context[AST_MAX_CONTEXT]; /*!< Default context for incoming calls */
1001 char subscribecontext[AST_MAX_CONTEXT]; /*!< Default context for subscriptions */
1002 char username[80]; /*!< Temporary username until registration */
1003 char accountcode[AST_MAX_ACCOUNT_CODE]; /*!< Account code */
1004 int amaflags; /*!< AMA Flags (for billing) */
1005 char tohost[MAXHOSTNAMELEN]; /*!< If not dynamic, IP address */
1006 char regexten[AST_MAX_EXTENSION]; /*!< Extension to register (if regcontext is used) */
1007 char fromuser[80]; /*!< From: user when calling this peer */
1008 char fromdomain[MAXHOSTNAMELEN]; /*!< From: domain when calling this peer */
1009 char fullcontact[256]; /*!< Contact registered with us (not in sip.conf) */
1010 char cid_num[80]; /*!< Caller ID num */
1011 char cid_name[80]; /*!< Caller ID name */
1012 int callingpres; /*!< Calling id presentation */
1013 int inUse; /*!< Number of calls in use */
1014 int inRinging; /*!< Number of calls ringing */
1015 int call_limit; /*!< Limit of concurrent calls */
1016 enum transfermodes allowtransfer; /*! SIP Refer restriction scheme */
1017 char vmexten[AST_MAX_EXTENSION]; /*!< Dialplan extension for MWI notify message*/
1018 char mailbox[AST_MAX_EXTENSION]; /*!< Mailbox setting for MWI checks */
1019 char language[MAX_LANGUAGE]; /*!< Default language for prompts */
1020 char musicclass[MAX_MUSICCLASS];/*!< Music on Hold class */
1021 char useragent[256]; /*!< User agent in SIP request (saved from registration) */
1022 struct ast_codec_pref prefs; /*!< codec prefs */
1024 time_t lastmsgcheck; /*!< Last time we checked for MWI */
1025 unsigned int sipoptions; /*!< Supported SIP options */
1026 struct ast_flags flags[2]; /*!< SIP_ flags */
1027 int expire; /*!< When to expire this peer registration */
1028 int capability; /*!< Codec capability */
1029 int rtptimeout; /*!< RTP timeout */
1030 int rtpholdtimeout; /*!< RTP Hold Timeout */
1031 int rtpkeepalive; /*!< Send RTP packets for keepalive */
1032 ast_group_t callgroup; /*!< Call group */
1033 ast_group_t pickupgroup; /*!< Pickup group */
1034 struct ast_dnsmgr_entry *dnsmgr;/*!< DNS refresh manager for peer */
1035 struct sockaddr_in addr; /*!< IP address of peer */
1036 int maxcallbitrate; /*!< Maximum Bitrate for a video call */
1039 struct sip_pvt *call; /*!< Call pointer */
1040 int pokeexpire; /*!< When to expire poke (qualify= checking) */
1041 int lastms; /*!< How long last response took (in ms), or -1 for no response */
1042 int maxms; /*!< Max ms we will accept for the host to be up, 0 to not monitor */
1043 struct timeval ps; /*!< Ping send time */
1045 struct sockaddr_in defaddr; /*!< Default IP address, used until registration */
1046 struct ast_ha *ha; /*!< Access control list */
1047 struct ast_variable *chanvars; /*!< Variables to set for channel created by user */
1048 struct sip_pvt *mwipvt; /*!< Subscription for MWI */
1054 /*! \brief Registrations with other SIP proxies */
1055 struct sip_registry {
1056 ASTOBJ_COMPONENTS_FULL(struct sip_registry,1,1);
1057 AST_DECLARE_STRING_FIELDS(
1058 AST_STRING_FIELD(callid); /*!< Global Call-ID */
1059 AST_STRING_FIELD(realm); /*!< Authorization realm */
1060 AST_STRING_FIELD(nonce); /*!< Authorization nonce */
1061 AST_STRING_FIELD(opaque); /*!< Opaque nonsense */
1062 AST_STRING_FIELD(qop); /*!< Quality of Protection, since SIP wasn't complicated enough yet. */
1063 AST_STRING_FIELD(domain); /*!< Authorization domain */
1064 AST_STRING_FIELD(username); /*!< Who we are registering as */
1065 AST_STRING_FIELD(authuser); /*!< Who we *authenticate* as */
1066 AST_STRING_FIELD(hostname); /*!< Domain or host we register to */
1067 AST_STRING_FIELD(secret); /*!< Password in clear text */
1068 AST_STRING_FIELD(md5secret); /*!< Password in md5 */
1069 AST_STRING_FIELD(contact); /*!< Contact extension */
1070 AST_STRING_FIELD(random);
1072 int portno; /*!< Optional port override */
1073 int expire; /*!< Sched ID of expiration */
1074 int regattempts; /*!< Number of attempts (since the last success) */
1075 int timeout; /*!< sched id of sip_reg_timeout */
1076 int refresh; /*!< How often to refresh */
1077 struct sip_pvt *call; /*!< create a sip_pvt structure for each outbound "registration dialog" in progress */
1078 enum sipregistrystate regstate; /*!< Registration state (see above) */
1079 time_t regtime; /*!< Last succesful registration time */
1080 int callid_valid; /*!< 0 means we haven't chosen callid for this registry yet. */
1081 unsigned int ocseq; /*!< Sequence number we got to for REGISTERs for this registry */
1082 struct sockaddr_in us; /*!< Who the server thinks we are */
1083 int noncecount; /*!< Nonce-count */
1084 char lastmsg[256]; /*!< Last Message sent/received */
1087 /* --- Linked lists of various objects --------*/
1089 /*! \brief The user list: Users and friends */
1090 static struct ast_user_list {
1091 ASTOBJ_CONTAINER_COMPONENTS(struct sip_user);
1094 /*! \brief The peer list: Peers and Friends */
1095 static struct ast_peer_list {
1096 ASTOBJ_CONTAINER_COMPONENTS(struct sip_peer);
1099 /*! \brief The register list: Other SIP proxys we register with and place calls to */
1100 static struct ast_register_list {
1101 ASTOBJ_CONTAINER_COMPONENTS(struct sip_registry);
1105 /*! \todo Move the sip_auth list to AST_LIST */
1106 static struct sip_auth *authl = NULL; /*!< Authentication list for realm authentication */
1109 /* --- Sockets and networking --------------*/
1110 static int sipsock = -1; /*!< Main socket for SIP network communication */
1111 static struct sockaddr_in bindaddr = { 0, }; /*!< The address we bind to */
1112 static struct sockaddr_in externip; /*!< External IP address if we are behind NAT */
1113 static char externhost[MAXHOSTNAMELEN]; /*!< External host name (possibly with dynamic DNS and DHCP */
1114 static time_t externexpire = 0; /*!< Expiration counter for re-resolving external host name in dynamic DNS */
1115 static int externrefresh = 10;
1116 static struct ast_ha *localaddr; /*!< List of local networks, on the same side of NAT as this Asterisk */
1117 static struct in_addr __ourip;
1118 static struct sockaddr_in outboundproxyip;
1120 static struct sockaddr_in debugaddr;
1122 static struct ast_config *notify_types; /*!< The list of manual NOTIFY types we know how to send */
1124 /*---------------------------- Forward declarations of functions in chan_sip.c */
1125 /*! \note This is added to help splitting up chan_sip.c into several files
1126 in coming releases */
1128 /*--- PBX interface functions */
1129 static struct ast_channel *sip_request_call(const char *type, int format, void *data, int *cause);
1130 static int sip_devicestate(void *data);
1131 static int sip_sendtext(struct ast_channel *ast, const char *text);
1132 static int sip_call(struct ast_channel *ast, char *dest, int timeout);
1133 static int sip_hangup(struct ast_channel *ast);
1134 static int sip_answer(struct ast_channel *ast);
1135 static struct ast_frame *sip_read(struct ast_channel *ast);
1136 static int sip_write(struct ast_channel *ast, struct ast_frame *frame);
1137 static int sip_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen);
1138 static int sip_transfer(struct ast_channel *ast, const char *dest);
1139 static int sip_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
1140 static int sip_senddigit(struct ast_channel *ast, char digit);
1142 /*--- Transmitting responses and requests */
1143 static int sipsock_read(int *id, int fd, short events, void *ignore);
1144 static int __sip_xmit(struct sip_pvt *p, char *data, int len);
1145 static int __sip_reliable_xmit(struct sip_pvt *p, int seqno, int resp, char *data, int len, int fatal, int sipmethod);
1146 static int __transmit_response(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
1147 static int retrans_pkt(void *data);
1148 static int transmit_sip_request(struct sip_pvt *p, struct sip_request *req);
1149 static int transmit_response(struct sip_pvt *p, const char *msg, const struct sip_request *req);
1150 static int transmit_response_reliable(struct sip_pvt *p, const char *msg, const struct sip_request *req);
1151 static int transmit_response_with_date(struct sip_pvt *p, const char *msg, const struct sip_request *req);
1152 static int transmit_response_with_sdp(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
1153 static int transmit_response_with_unsupported(struct sip_pvt *p, const char *msg, const struct sip_request *req, const char *unsupported);
1154 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);
1155 static int transmit_response_with_allow(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
1156 static void transmit_fake_auth_response(struct sip_pvt *p, struct sip_request *req, int reliable);
1157 static int transmit_request(struct sip_pvt *p, int sipmethod, int inc, enum xmittype reliable, int newbranch);
1158 static int transmit_request_with_auth(struct sip_pvt *p, int sipmethod, int seqno, enum xmittype reliable, int newbranch);
1159 static int transmit_invite(struct sip_pvt *p, int sipmethod, int sdp, int init);
1160 static int transmit_reinvite_with_sdp(struct sip_pvt *p);
1161 static int transmit_info_with_digit(struct sip_pvt *p, const char digit);
1162 static int transmit_info_with_vidupdate(struct sip_pvt *p);
1163 static int transmit_message_with_text(struct sip_pvt *p, const char *text);
1164 static int transmit_refer(struct sip_pvt *p, const char *dest);
1165 static int transmit_notify_with_mwi(struct sip_pvt *p, int newmsgs, int oldmsgs, char *vmexten);
1166 static int transmit_notify_with_sipfrag(struct sip_pvt *p, int cseq, char *message, int terminate);
1167 static int transmit_state_notify(struct sip_pvt *p, int state, int full);
1168 static int transmit_register(struct sip_registry *r, int sipmethod, const char *auth, const char *authheader);
1169 static int send_response(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno);
1170 static int send_request(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno);
1171 static void copy_request(struct sip_request *dst, const struct sip_request *src);
1172 static void receive_message(struct sip_pvt *p, struct sip_request *req);
1173 static void parse_moved_contact(struct sip_pvt *p, struct sip_request *req);
1174 static int sip_send_mwi_to_peer(struct sip_peer *peer);
1175 static int does_peer_need_mwi(struct sip_peer *peer);
1177 /*--- Dialog management */
1178 static struct sip_pvt *sip_alloc(ast_string_field callid, struct sockaddr_in *sin,
1179 int useglobal_nat, const int intended_method);
1180 static int __sip_autodestruct(void *data);
1181 static void sip_scheddestroy(struct sip_pvt *p, int ms);
1182 static void sip_cancel_destroy(struct sip_pvt *p);
1183 static void sip_destroy(struct sip_pvt *p);
1184 static void __sip_destroy(struct sip_pvt *p, int lockowner);
1185 static void __sip_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod, int reset);
1186 static void __sip_pretend_ack(struct sip_pvt *p);
1187 static int __sip_semi_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod);
1188 static int auto_congest(void *nothing);
1189 static int update_call_counter(struct sip_pvt *fup, int event);
1190 static int hangup_sip2cause(int cause);
1191 static const char *hangup_cause2sip(int cause);
1192 static struct sip_pvt *find_call(struct sip_request *req, struct sockaddr_in *sin, const int intended_method);
1193 static void free_old_route(struct sip_route *route);
1194 static void list_route(struct sip_route *route);
1195 static void build_route(struct sip_pvt *p, struct sip_request *req, int backwards);
1196 static enum check_auth_result register_verify(struct sip_pvt *p, struct sockaddr_in *sin,
1197 struct sip_request *req, char *uri);
1198 static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag);
1199 static void check_pendings(struct sip_pvt *p);
1200 static void *sip_park_thread(void *stuff);
1201 static int sip_park(struct ast_channel *chan1, struct ast_channel *chan2, struct sip_request *req, int seqno);
1202 static int sip_sipredirect(struct sip_pvt *p, const char *dest);
1204 /*--- Codec handling / SDP */
1205 static void try_suggested_sip_codec(struct sip_pvt *p);
1206 static const char* get_sdp_iterate(int* start, struct sip_request *req, const char *name);
1207 static const char *get_sdp(struct sip_request *req, const char *name);
1208 static int find_sdp(struct sip_request *req);
1209 static int process_sdp(struct sip_pvt *p, struct sip_request *req);
1210 static void add_codec_to_sdp(const struct sip_pvt *p, int codec, int sample_rate,
1211 char **m_buf, size_t *m_size, char **a_buf, size_t *a_size,
1213 static void add_noncodec_to_sdp(const struct sip_pvt *p, int format, int sample_rate,
1214 char **m_buf, size_t *m_size, char **a_buf, size_t *a_size,
1216 static int add_sdp(struct sip_request *resp, struct sip_pvt *p);
1218 /*--- Authentication stuff */
1219 static int do_proxy_auth(struct sip_pvt *p, struct sip_request *req, char *header, char *respheader, int sipmethod, int init);
1220 static int reply_digest(struct sip_pvt *p, struct sip_request *req, char *header, int sipmethod, char *digest, int digest_len);
1221 static int build_reply_digest(struct sip_pvt *p, int method, char *digest, int digest_len);
1222 static int clear_realm_authentication(struct sip_auth *authlist); /* Clear realm authentication list (at reload) */
1223 static struct sip_auth *add_realm_authentication(struct sip_auth *authlist, char *configuration, int lineno); /* Add realm authentication in list */
1224 static struct sip_auth *find_realm_authentication(struct sip_auth *authlist, const char *realm); /* Find authentication for a specific realm */
1225 static enum check_auth_result check_auth(struct sip_pvt *p, struct sip_request *req, const char *username,
1226 const char *secret, const char *md5secret, int sipmethod,
1227 char *uri, enum xmittype reliable, int ignore);
1228 static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_request *req,
1229 int sipmethod, char *uri, enum xmittype reliable,
1230 struct sockaddr_in *sin, struct sip_peer **authpeer);
1231 static int check_user(struct sip_pvt *p, struct sip_request *req, int sipmethod, char *uri, enum xmittype reliable, struct sockaddr_in *sin);
1232 static int do_proxy_auth(struct sip_pvt *p, struct sip_request *req, char *header, char *respheader, int sipmethod, int init);
1233 static int build_reply_digest(struct sip_pvt *p, int method, char* digest, int digest_len);
1235 /*--- Domain handling */
1236 static int check_sip_domain(const char *domain, char *context, size_t len); /* Check if domain is one of our local domains */
1237 static int add_sip_domain(const char *domain, const enum domain_mode mode, const char *context);
1238 static void clear_sip_domains(void);
1240 /*--- SIP realm authentication */
1241 static struct sip_auth *add_realm_authentication(struct sip_auth *authlist, char *configuration, int lineno);
1242 static int clear_realm_authentication(struct sip_auth *authlist);
1243 static struct sip_auth *find_realm_authentication(struct sip_auth *authlist, const char *realm);
1245 /*--- Misc functions */
1246 static int sip_do_reload(enum channelreloadreason reason);
1247 static int reload_config(enum channelreloadreason reason);
1248 static int expire_register(void *data);
1249 static int sip_sipredirect(struct sip_pvt *p, const char *dest);
1250 static void *do_monitor(void *data);
1251 static int restart_monitor(void);
1252 static int sip_send_mwi_to_peer(struct sip_peer *peer);
1253 static void sip_destroy(struct sip_pvt *p);
1254 static int sip_addrcmp(char *name, struct sockaddr_in *sin); /* Support for peer matching */
1255 static int sip_refer_allocate(struct sip_pvt *p);
1256 static void ast_quiet_chan(struct ast_channel *chan);
1257 static int attempt_transfer(struct sip_dual *transferer, struct sip_dual *target);
1259 /*--- Device monitoring and Device/extension state handling */
1260 static int cb_extensionstate(char *context, char* exten, int state, void *data);
1261 static int sip_devicestate(void *data);
1262 static int sip_poke_noanswer(void *data);
1263 static int sip_poke_peer(struct sip_peer *peer);
1264 static void sip_poke_all_peers(void);
1267 /*--- Applications, functions, CLI and manager command helpers */
1268 static const char *sip_nat_mode(const struct sip_pvt *p);
1269 static int sip_show_inuse(int fd, int argc, char *argv[]);
1270 static char *transfermode2str(enum transfermodes mode);
1271 static char *nat2str(int nat);
1272 static int peer_status(struct sip_peer *peer, char *status, int statuslen);
1273 static int sip_show_users(int fd, int argc, char *argv[]);
1274 static int _sip_show_peers(int fd, int *total, struct mansession *s, struct message *m, int argc, char *argv[]);
1275 static int manager_sip_show_peers( struct mansession *s, struct message *m );
1276 static int sip_show_peers(int fd, int argc, char *argv[]);
1277 static int sip_show_objects(int fd, int argc, char *argv[]);
1278 static void print_group(int fd, unsigned int group, int crlf);
1279 static const char *dtmfmode2str(int mode);
1280 static const char *insecure2str(int port, int invite);
1281 static void cleanup_stale_contexts(char *new, char *old);
1282 static void print_codec_to_cli(int fd, struct ast_codec_pref *pref);
1283 static const char *domain_mode_to_text(const enum domain_mode mode);
1284 static int sip_show_domains(int fd, int argc, char *argv[]);
1285 static int _sip_show_peer(int type, int fd, struct mansession *s, struct message *m, int argc, char *argv[]);
1286 static int manager_sip_show_peer( struct mansession *s, struct message *m);
1287 static int sip_show_peer(int fd, int argc, char *argv[]);
1288 static int _sip_show_peer(int type, int fd, struct mansession *s, struct message *m, int argc, char *argv[]);
1289 static int sip_show_user(int fd, int argc, char *argv[]);
1290 static int sip_show_registry(int fd, int argc, char *argv[]);
1291 static int sip_show_settings(int fd, int argc, char *argv[]);
1292 static const char *subscription_type2str(enum subscriptiontype subtype);
1293 static const struct cfsubscription_types *find_subscription_type(enum subscriptiontype subtype);
1294 static int __sip_show_channels(int fd, int argc, char *argv[], int subscriptions);
1295 static int sip_show_channels(int fd, int argc, char *argv[]);
1296 static int sip_show_subscriptions(int fd, int argc, char *argv[]);
1297 static int __sip_show_channels(int fd, int argc, char *argv[], int subscriptions);
1298 static char *complete_sipch(const char *line, const char *word, int pos, int state);
1299 static char *complete_sip_peer(const char *word, int state, int flags2);
1300 static char *complete_sip_show_peer(const char *line, const char *word, int pos, int state);
1301 static char *complete_sip_debug_peer(const char *line, const char *word, int pos, int state);
1302 static char *complete_sip_user(const char *word, int state, int flags2);
1303 static char *complete_sip_show_user(const char *line, const char *word, int pos, int state);
1304 static char *complete_sipnotify(const char *line, const char *word, int pos, int state);
1305 static char *complete_sip_prune_realtime_peer(const char *line, const char *word, int pos, int state);
1306 static char *complete_sip_prune_realtime_user(const char *line, const char *word, int pos, int state);
1307 static int sip_show_channel(int fd, int argc, char *argv[]);
1308 static int sip_show_history(int fd, int argc, char *argv[]);
1309 static int sip_do_debug_ip(int fd, int argc, char *argv[]);
1310 static int sip_do_debug_peer(int fd, int argc, char *argv[]);
1311 static int sip_do_debug(int fd, int argc, char *argv[]);
1312 static int sip_no_debug(int fd, int argc, char *argv[]);
1313 static int sip_notify(int fd, int argc, char *argv[]);
1314 static int sip_do_history(int fd, int argc, char *argv[]);
1315 static int sip_no_history(int fd, int argc, char *argv[]);
1316 static int func_header_read(struct ast_channel *chan, char *function, char *data, char *buf, size_t len);
1317 static int func_check_sipdomain(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len);
1318 static int function_sippeer(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len);
1319 static int function_sipchaninfo_read(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len);
1320 static int sip_dtmfmode(struct ast_channel *chan, void *data);
1321 static int sip_addheader(struct ast_channel *chan, void *data);
1322 static int sip_do_reload(enum channelreloadreason reason);
1323 static int sip_reload(int fd, int argc, char *argv[]);
1326 Functions for enabling debug per IP or fully, or enabling history logging for
1329 static void sip_dump_history(struct sip_pvt *dialog); /* Dump history to LOG_DEBUG at end of dialog, before destroying data */
1330 static inline int sip_debug_test_addr(const struct sockaddr_in *addr);
1331 static inline int sip_debug_test_pvt(struct sip_pvt *p);
1332 static void append_history_full(struct sip_pvt *p, const char *fmt, ...);
1333 static void sip_dump_history(struct sip_pvt *dialog);
1335 /*--- Device object handling */
1336 static struct sip_peer *temp_peer(const char *name);
1337 static struct sip_peer *build_peer(const char *name, struct ast_variable *v, int realtime);
1338 static struct sip_user *build_user(const char *name, struct ast_variable *v, int realtime);
1339 static int update_call_counter(struct sip_pvt *fup, int event);
1340 static void sip_destroy_peer(struct sip_peer *peer);
1341 static void sip_destroy_user(struct sip_user *user);
1342 static int sip_poke_peer(struct sip_peer *peer);
1343 static void set_peer_defaults(struct sip_peer *peer);
1344 static struct sip_peer *temp_peer(const char *name);
1345 static void register_peer_exten(struct sip_peer *peer, int onoff);
1346 static void sip_destroy_peer(struct sip_peer *peer);
1347 static void sip_destroy_user(struct sip_user *user);
1348 static struct sip_peer *find_peer(const char *peer, struct sockaddr_in *sin, int realtime);
1349 static struct sip_user *find_user(const char *name, int realtime);
1350 static int sip_poke_peer_s(void *data);
1351 static enum parse_register_result parse_register_contact(struct sip_pvt *pvt, struct sip_peer *p, struct sip_request *req);
1352 static int expire_register(void *data);
1353 static void reg_source_db(struct sip_peer *peer);
1354 static void destroy_association(struct sip_peer *peer);
1355 static int handle_common_options(struct ast_flags *flags, struct ast_flags *mask, struct ast_variable *v);
1357 /* Realtime device support */
1358 static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, const char *username, const char *fullcontact, int expirey);
1359 static struct sip_user *realtime_user(const char *username);
1360 static void update_peer(struct sip_peer *p, int expiry);
1361 static struct sip_peer *realtime_peer(const char *peername, struct sockaddr_in *sin);
1362 static int sip_prune_realtime(int fd, int argc, char *argv[]);
1364 /*--- Internal UA client handling (outbound registrations) */
1365 static int ast_sip_ouraddrfor(struct in_addr *them, struct in_addr *us);
1366 static void sip_registry_destroy(struct sip_registry *reg);
1367 static int sip_register(char *value, int lineno);
1368 static char *regstate2str(enum sipregistrystate regstate);
1369 static int sip_reregister(void *data);
1370 static int __sip_do_register(struct sip_registry *r);
1371 static int sip_reg_timeout(void *data);
1372 static int do_register_auth(struct sip_pvt *p, struct sip_request *req, char *header, char *respheader);
1373 static int reply_digest(struct sip_pvt *p, struct sip_request *req, char *header, int sipmethod, char *digest, int digest_len);
1374 static void sip_send_all_registers(void);
1376 /*--- Parsing SIP requests and responses */
1377 static void append_date(struct sip_request *req); /* Append date to SIP packet */
1378 static int determine_firstline_parts(struct sip_request *req);
1379 static const struct cfsubscription_types *find_subscription_type(enum subscriptiontype subtype);
1380 static const char *gettag(const struct sip_request *req, const char *header, char *tagbuf, int tagbufsize);
1381 static int find_sip_method(const char *msg);
1382 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported);
1383 static void parse_request(struct sip_request *req);
1384 static const char *get_header(const struct sip_request *req, const char *name);
1385 static char *referstatus2str(enum referstatus rstatus);
1386 static int method_match(enum sipmethod id, const char *name);
1387 static void parse_copy(struct sip_request *dst, const struct sip_request *src);
1388 static char *get_in_brackets(char *tmp);
1389 static const char *find_alias(const char *name, const char *_default);
1390 static const char *__get_header(const struct sip_request *req, const char *name, int *start);
1391 static const char *get_header(const struct sip_request *req, const char *name);
1392 static int lws2sws(char *msgbuf, int len);
1393 static void extract_uri(struct sip_pvt *p, struct sip_request *req);
1394 static int get_refer_info(struct sip_pvt *transferer, struct sip_request *outgoing_req);
1395 static int get_also_info(struct sip_pvt *p, struct sip_request *oreq);
1396 static int parse_ok_contact(struct sip_pvt *pvt, struct sip_request *req);
1397 static int set_address_from_contact(struct sip_pvt *pvt);
1398 static void check_via(struct sip_pvt *p, struct sip_request *req);
1399 static char *get_calleridname(const char *input, char *output, size_t outputsize);
1400 static int get_rpid_num(const char *input, char *output, int maxlen);
1401 static int get_rdnis(struct sip_pvt *p, struct sip_request *oreq);
1402 static int get_destination(struct sip_pvt *p, struct sip_request *oreq);
1403 static int get_msg_text(char *buf, int len, struct sip_request *req);
1404 static const char *gettag(const struct sip_request *req, const char *header, char *tagbuf, int tagbufsize);
1405 static void free_old_route(struct sip_route *route);
1407 /*--- Constructing requests and responses */
1408 static void initialize_initreq(struct sip_pvt *p, struct sip_request *req);
1409 static int init_req(struct sip_request *req, int sipmethod, const char *recip);
1410 static int reqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod, int seqno, int newbranch);
1411 static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod);
1412 static int init_resp(struct sip_request *resp, const char *msg);
1413 static int respprep(struct sip_request *resp, struct sip_pvt *p, const char *msg, const struct sip_request *req);
1414 static const struct sockaddr_in *sip_real_dst(const struct sip_pvt *p);
1415 static void build_via(struct sip_pvt *p);
1416 static int create_addr_from_peer(struct sip_pvt *r, struct sip_peer *peer);
1417 static int create_addr(struct sip_pvt *dialog, const char *opeer);
1418 static char *generate_random_string(char *buf, size_t size);
1419 static void build_callid_pvt(struct sip_pvt *pvt);
1420 static void build_callid_registry(struct sip_registry *reg, struct in_addr ourip, const char *fromdomain);
1421 static void make_our_tag(char *tagbuf, size_t len);
1422 static int add_header(struct sip_request *req, const char *var, const char *value);
1423 static int add_header_contentLength(struct sip_request *req, int len);
1424 static int add_line(struct sip_request *req, const char *line);
1425 static int add_text(struct sip_request *req, const char *text);
1426 static int add_digit(struct sip_request *req, char digit);
1427 static int add_vidupdate(struct sip_request *req);
1428 static void add_route(struct sip_request *req, struct sip_route *route);
1429 static int copy_header(struct sip_request *req, const struct sip_request *orig, const char *field);
1430 static int copy_all_header(struct sip_request *req, const struct sip_request *orig, const char *field);
1431 static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, const struct sip_request *orig, const char *field);
1432 static void set_destination(struct sip_pvt *p, char *uri);
1433 static void append_date(struct sip_request *req);
1434 static void build_contact(struct sip_pvt *p);
1435 static void build_rpid(struct sip_pvt *p);
1437 /*------Request handling functions */
1438 static int handle_request(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int *recount, int *nounlock);
1439 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);
1440 static int handle_request_refer(struct sip_pvt *p, struct sip_request *req, int debug, int ignore, int seqno, int *nounlock);
1441 static int handle_request_bye(struct sip_pvt *p, struct sip_request *req);
1442 static int handle_request_register(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, char *e);
1443 static int handle_request_cancel(struct sip_pvt *p, struct sip_request *req);
1444 static int handle_request_message(struct sip_pvt *p, struct sip_request *req);
1445 static int handle_request_subscribe(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int seqno, char *e);
1446 static void handle_request_info(struct sip_pvt *p, struct sip_request *req);
1447 static int handle_request_options(struct sip_pvt *p, struct sip_request *req);
1448 static int handle_invite_replaces(struct sip_pvt *p, struct sip_request *req, int debug, int ignore, int seqno, struct sockaddr_in *sin);
1449 static int handle_request_notify(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int seqno, char *e);
1450 static int handle_invite_replaces(struct sip_pvt *p, struct sip_request *req, int debug, int ignore, int seqno, struct sockaddr_in *sin);
1451 static int local_attended_transfer(struct sip_pvt *transferer, struct sip_dual *current, struct sip_request *req, int seqno);
1453 /*------Response handling functions */
1454 static void handle_response_invite(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int seqno);
1455 static void handle_response_refer(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int seqno);
1456 static int handle_response_peerpoke(struct sip_pvt *p, int resp, struct sip_request *req);
1457 static int handle_response_register(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int ignore, int seqno);
1458 static void handle_response(struct sip_pvt *p, int resp, char *rest, struct sip_request *req, int ignore, int seqno);
1460 /*----- RTP interface functions */
1461 static int sip_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp, struct ast_rtp *vrtp, int codecs, int nat_active);
1462 static struct ast_rtp *sip_get_rtp_peer(struct ast_channel *chan);
1463 static struct ast_rtp *sip_get_vrtp_peer(struct ast_channel *chan);
1464 static int sip_get_codec(struct ast_channel *chan);
1465 static struct ast_frame *sip_rtp_read(struct ast_channel *ast, struct sip_pvt *p, int *faxdetect);
1467 /*------ T38 Support --------- */
1468 static int sip_handle_t38_reinvite(struct ast_channel *chan, struct sip_pvt *pvt, int reinvite); /*!< T38 negotiation helper function */
1469 static int transmit_response_with_t38_sdp(struct sip_pvt *p, char *msg, struct sip_request *req, int retrans);
1470 static int transmit_reinvite_with_t38_sdp(struct sip_pvt *p);
1471 static struct ast_udptl *sip_get_udptl_peer(struct ast_channel *chan);
1472 static int sip_set_udptl_peer(struct ast_channel *chan, struct ast_udptl *udptl);
1474 /*! \brief Definition of this channel for PBX channel registration */
1475 static const struct ast_channel_tech sip_tech = {
1477 .description = "Session Initiation Protocol (SIP)",
1478 .capabilities = ((AST_FORMAT_MAX_AUDIO << 1) - 1),
1479 .properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
1480 .requester = sip_request_call,
1481 .devicestate = sip_devicestate,
1483 .hangup = sip_hangup,
1484 .answer = sip_answer,
1487 .write_video = sip_write,
1488 .indicate = sip_indicate,
1489 .transfer = sip_transfer,
1491 .send_digit = sip_senddigit,
1492 .bridge = ast_rtp_bridge,
1493 .send_text = sip_sendtext,
1496 /**--- some list management macros. **/
1498 #define UNLINK(element, head, prev) do { \
1500 (prev)->next = (element)->next; \
1502 (head) = (element)->next; \
1505 /*! \brief Interface structure with callbacks used to connect to RTP module */
1506 static struct ast_rtp_protocol sip_rtp = {
1508 get_rtp_info: sip_get_rtp_peer,
1509 get_vrtp_info: sip_get_vrtp_peer,
1510 set_rtp_peer: sip_set_rtp_peer,
1511 get_codec: sip_get_codec,
1514 /*! \brief Interface structure with callbacks used to connect to UDPTL module*/
1515 static struct ast_udptl_protocol sip_udptl = {
1517 get_udptl_info: sip_get_udptl_peer,
1518 set_udptl_peer: sip_set_udptl_peer,
1521 /*! \brief Convert transfer status to string */
1522 static char *referstatus2str(enum referstatus rstatus)
1524 int i = (sizeof(referstatusstrings) / sizeof(referstatusstrings[0]));
1527 for (x = 0; x < i; x++) {
1528 if (referstatusstrings[x].status == rstatus)
1529 return (char *) referstatusstrings[x].text;
1534 /*! \brief Initialize the initital request packet in the pvt structure.
1535 This packet is used for creating replies and future requests in
1537 static void initialize_initreq(struct sip_pvt *p, struct sip_request *req)
1539 if (p->initreq.headers) {
1540 ast_log(LOG_DEBUG, "Initializing already initialized SIP dialog %s (presumably reinvite)\n", p->callid);
1542 /* Use this as the basis */
1543 copy_request(&p->initreq, req);
1544 parse_request(&p->initreq);
1545 if (ast_test_flag(req, SIP_PKT_DEBUG))
1546 ast_verbose("%d headers, %d lines\n", p->initreq.headers, p->initreq.lines);
1550 /*! \brief returns true if 'name' (with optional trailing whitespace)
1551 * matches the sip method 'id'.
1552 * Strictly speaking, SIP methods are case SENSITIVE, but we do
1553 * a case-insensitive comparison to be more tolerant.
1554 * following Jon Postel's rule: Be gentle in what you accept, strict with what you send
1556 static int method_match(enum sipmethod id, const char *name)
1558 int len = strlen(sip_methods[id].text);
1559 int l_name = name ? strlen(name) : 0;
1560 /* true if the string is long enough, and ends with whitespace, and matches */
1561 return (l_name >= len && name[len] < 33 &&
1562 !strncasecmp(sip_methods[id].text, name, len));
1565 /*! \brief find_sip_method: Find SIP method from header */
1566 static int find_sip_method(const char *msg)
1570 if (ast_strlen_zero(msg))
1572 for (i = 1; i < (sizeof(sip_methods) / sizeof(sip_methods[0])) && !res; i++) {
1573 if (method_match(i, msg))
1574 res = sip_methods[i].id;
1579 /*! \brief Parse supported header in incoming packet */
1580 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported)
1583 char *temp = ast_strdupa(supported);
1584 unsigned int profile = 0;
1587 if (ast_strlen_zero(supported) )
1590 if (option_debug > 2 && sipdebug)
1591 ast_log(LOG_DEBUG, "Begin: parsing SIP \"Supported: %s\"\n", supported);
1593 for (next = temp; next; next = sep) {
1595 if ( (sep = strchr(next, ',')) != NULL)
1597 next = ast_skip_blanks(next);
1598 if (option_debug > 2 && sipdebug)
1599 ast_log(LOG_DEBUG, "Found SIP option: -%s-\n", next);
1600 for (i=0; i < (sizeof(sip_options) / sizeof(sip_options[0])); i++) {
1601 if (!strcasecmp(next, sip_options[i].text)) {
1602 profile |= sip_options[i].id;
1604 if (option_debug > 2 && sipdebug)
1605 ast_log(LOG_DEBUG, "Matched SIP option: %s\n", next);
1609 if (!found && option_debug > 2 && sipdebug)
1610 ast_log(LOG_DEBUG, "Found no match for SIP option: %s (Please file bug report!)\n", next);
1614 pvt->sipoptions = profile;
1618 /*! \brief See if we pass debug IP filter */
1619 static inline int sip_debug_test_addr(const struct sockaddr_in *addr)
1623 if (debugaddr.sin_addr.s_addr) {
1624 if (((ntohs(debugaddr.sin_port) != 0)
1625 && (debugaddr.sin_port != addr->sin_port))
1626 || (debugaddr.sin_addr.s_addr != addr->sin_addr.s_addr))
1632 /*! \brief The real destination address for a write */
1633 static const struct sockaddr_in *sip_real_dst(const struct sip_pvt *p)
1635 return ast_test_flag(&p->flags[0], SIP_NAT) & SIP_NAT_ROUTE ? &p->recv : &p->sa;
1638 /*! \brief Display SIP nat mode */
1639 static const char *sip_nat_mode(const struct sip_pvt *p)
1641 return ast_test_flag(&p->flags[0], SIP_NAT) & SIP_NAT_ROUTE ? "NAT" : "no NAT";
1644 /*! \brief Test PVT for debugging output */
1645 static inline int sip_debug_test_pvt(struct sip_pvt *p)
1649 return sip_debug_test_addr(sip_real_dst(p));
1652 /*! \brief Transmit SIP message */
1653 static int __sip_xmit(struct sip_pvt *p, char *data, int len)
1656 char iabuf[INET_ADDRSTRLEN];
1657 const struct sockaddr_in *dst = sip_real_dst(p);
1658 res=sendto(sipsock, data, len, 0, (const struct sockaddr *)dst, sizeof(struct sockaddr_in));
1661 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));
1666 /*! \brief Build a Via header for a request */
1667 static void build_via(struct sip_pvt *p)
1669 char iabuf[INET_ADDRSTRLEN];
1670 /* Work around buggy UNIDEN UIP200 firmware */
1671 const char *rport = ast_test_flag(&p->flags[0], SIP_NAT) & SIP_NAT_RFC3581 ? ";rport" : "";
1673 /* z9hG4bK is a magic cookie. See RFC 3261 section 8.1.1.7 */
1674 ast_string_field_build(p, via, "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x%s",
1675 ast_inet_ntoa(iabuf, sizeof(iabuf), p->ourip), ourport, p->branch, rport);
1678 /*! \brief NAT fix - decide which IP address to use for ASterisk server?
1680 * Using the localaddr structure built up with localnet statements in sip.conf
1681 * apply it to their address to see if we need to substitute our
1682 * externip or can get away with our internal bindaddr
1684 static enum sip_result ast_sip_ouraddrfor(struct in_addr *them, struct in_addr *us)
1686 struct sockaddr_in theirs, ours;
1688 /* Get our local information */
1689 ast_ouraddrfor(them, us);
1690 theirs.sin_addr = *them;
1691 ours.sin_addr = *us;
1693 if (localaddr && externip.sin_addr.s_addr &&
1694 ast_apply_ha(localaddr, &theirs) &&
1695 !ast_apply_ha(localaddr, &ours)) {
1696 if (externexpire && time(NULL) >= externexpire) {
1697 struct ast_hostent ahp;
1700 externexpire = time(NULL) + externrefresh;
1701 if ((hp = ast_gethostbyname(externhost, &ahp))) {
1702 memcpy(&externip.sin_addr, hp->h_addr, sizeof(externip.sin_addr));
1704 ast_log(LOG_NOTICE, "Warning: Re-lookup of '%s' failed!\n", externhost);
1706 *us = externip.sin_addr;
1708 char iabuf[INET_ADDRSTRLEN];
1709 ast_inet_ntoa(iabuf, sizeof(iabuf), *(struct in_addr *)&them->s_addr);
1710 ast_log(LOG_DEBUG, "Target address %s is not local, substituting externip\n", iabuf);
1712 } else if (bindaddr.sin_addr.s_addr)
1713 *us = bindaddr.sin_addr;
1717 /*! \brief Append to SIP dialog history
1718 \return Always returns 0 */
1719 #define append_history(p, event, fmt , args... ) append_history_full(p, "%-15s " fmt, event, ## args)
1721 static void append_history_full(struct sip_pvt *p, const char *fmt, ...)
1722 __attribute__ ((format (printf, 2, 3)));
1724 /*! \brief Append to SIP dialog history with arg list */
1725 static void append_history_va(struct sip_pvt *p, const char *fmt, va_list ap)
1727 char buf[80], *c = buf; /* max history length */
1728 struct sip_history *hist;
1731 vsnprintf(buf, sizeof(buf), fmt, ap);
1732 strsep(&c, "\r\n"); /* Trim up everything after \r or \n */
1733 l = strlen(buf) + 1;
1734 if (!(hist = ast_calloc(1, sizeof(*hist) + l)))
1736 if (!p->history && !(p->history = ast_calloc(1, sizeof(*p->history)))) {
1740 memcpy(hist->event, buf, l);
1741 AST_LIST_INSERT_TAIL(p->history, hist, list);
1744 /*! \brief Append to SIP dialog history with arg list */
1745 static void append_history_full(struct sip_pvt *p, const char *fmt, ...)
1749 if (!recordhistory || !p)
1752 append_history_va(p, fmt, ap);
1758 /*! \brief Retransmit SIP message if no answer (Called from scheduler) */
1759 static int retrans_pkt(void *data)
1761 struct sip_pkt *pkt = data, *prev, *cur = NULL;
1762 char iabuf[INET_ADDRSTRLEN];
1763 int reschedule = DEFAULT_RETRANS;
1765 /* Lock channel PVT */
1766 ast_mutex_lock(&pkt->owner->lock);
1768 if (pkt->retrans < MAX_RETRANS) {
1770 if (!pkt->timer_t1) { /* Re-schedule using timer_a and timer_t1 */
1771 if (sipdebug && option_debug > 3)
1772 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);
1776 if (sipdebug && option_debug > 3)
1777 ast_log(LOG_DEBUG, "SIP TIMER: Rescheduling retransmission #%d (%d) %s - %d\n", pkt->retransid, pkt->retrans, sip_methods[pkt->method].text, pkt->method);
1781 pkt->timer_a = 2 * pkt->timer_a;
1783 /* For non-invites, a maximum of 4 secs */
1784 siptimer_a = pkt->timer_t1 * pkt->timer_a; /* Double each time */
1785 if (pkt->method != SIP_INVITE && siptimer_a > 4000)
1788 /* Reschedule re-transmit */
1789 reschedule = siptimer_a;
1790 if (option_debug > 3)
1791 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);
1794 if (sip_debug_test_pvt(pkt->owner)) {
1795 const struct sockaddr_in *dst = sip_real_dst(pkt->owner);
1796 ast_verbose("Retransmitting #%d (%s) to %s:%d:\n%s\n---\n",
1797 pkt->retrans, sip_nat_mode(pkt->owner),
1798 ast_inet_ntoa(iabuf, sizeof(iabuf), dst->sin_addr),
1799 ntohs(dst->sin_port), pkt->data);
1802 append_history(pkt->owner, "ReTx", "%d %s", reschedule, pkt->data);
1803 __sip_xmit(pkt->owner, pkt->data, pkt->packetlen);
1804 ast_mutex_unlock(&pkt->owner->lock);
1807 /* Too many retries */
1808 if (pkt->owner && pkt->method != SIP_OPTIONS) {
1809 if (ast_test_flag(pkt, FLAG_FATAL) || sipdebug) /* Tell us if it's critical or if we're debugging */
1810 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");
1812 if ((pkt->method == SIP_OPTIONS) && sipdebug)
1813 ast_log(LOG_WARNING, "Cancelling retransmit of OPTIONs (call id %s) \n", pkt->owner->callid);
1815 append_history(pkt->owner, "MaxRetries", "%s", (ast_test_flag(pkt, FLAG_FATAL)) ? "(Critical)" : "(Non-critical)");
1817 pkt->retransid = -1;
1819 if (ast_test_flag(pkt, FLAG_FATAL)) {
1820 while(pkt->owner->owner && ast_channel_trylock(pkt->owner->owner)) {
1821 ast_mutex_unlock(&pkt->owner->lock); /* SIP_PVT, not channel */
1823 ast_mutex_lock(&pkt->owner->lock);
1825 if (pkt->owner->owner) {
1826 ast_set_flag(&pkt->owner->flags[0], SIP_ALREADYGONE);
1827 ast_log(LOG_WARNING, "Hanging up call %s - no reply to our critical packet.\n", pkt->owner->callid);
1828 ast_queue_hangup(pkt->owner->owner);
1829 ast_channel_unlock(pkt->owner->owner);
1831 /* If no channel owner, destroy now */
1832 ast_set_flag(&pkt->owner->flags[0], SIP_NEEDDESTROY);
1835 /* In any case, go ahead and remove the packet */
1836 for (prev = NULL, cur = pkt->owner->packets; cur; prev = cur, cur = cur->next) {
1842 prev->next = cur->next;
1844 pkt->owner->packets = cur->next;
1845 ast_mutex_unlock(&pkt->owner->lock);
1849 ast_log(LOG_WARNING, "Weird, couldn't find packet owner!\n");
1851 ast_mutex_unlock(&pkt->owner->lock);
1855 /*! \brief Transmit packet with retransmits
1856 \return 0 on success, -1 on failure to allocate packet
1858 static enum sip_result __sip_reliable_xmit(struct sip_pvt *p, int seqno, int resp, char *data, int len, int fatal, int sipmethod)
1860 struct sip_pkt *pkt;
1861 int siptimer_a = DEFAULT_RETRANS;
1863 if (!(pkt = ast_calloc(1, sizeof(*pkt) + len + 1)))
1865 memcpy(pkt->data, data, len);
1866 pkt->method = sipmethod;
1867 pkt->packetlen = len;
1868 pkt->next = p->packets;
1872 pkt->data[len] = '\0';
1873 pkt->timer_t1 = p->timer_t1; /* Set SIP timer T1 */
1875 ast_set_flag(pkt, FLAG_FATAL);
1877 siptimer_a = pkt->timer_t1 * 2;
1879 /* Schedule retransmission */
1880 pkt->retransid = ast_sched_add_variable(sched, siptimer_a, retrans_pkt, pkt, 1);
1881 if (option_debug > 3 && sipdebug)
1882 ast_log(LOG_DEBUG, "*** SIP TIMER: Initalizing retransmit timer on packet: Id #%d\n", pkt->retransid);
1883 pkt->next = p->packets;
1886 __sip_xmit(pkt->owner, pkt->data, pkt->packetlen); /* Send packet */
1887 if (sipmethod == SIP_INVITE) {
1888 /* Note this is a pending invite */
1889 p->pendinginvite = seqno;
1894 /*! \brief Kill a SIP dialog (called by scheduler) */
1895 static int __sip_autodestruct(void *data)
1897 struct sip_pvt *p = data;
1899 /* If this is a subscription, tell the phone that we got a timeout */
1900 if (p->subscribed) {
1901 p->subscribed = TIMEOUT;
1902 transmit_state_notify(p, AST_EXTENSION_DEACTIVATED, 1); /* Send last notification */
1903 p->subscribed = NONE;
1904 append_history(p, "Subscribestatus", "timeout");
1905 if (option_debug > 2)
1906 ast_log(LOG_DEBUG, "Re-scheduled destruction of SIP subsription %s\n", p->callid ? p->callid : "<unknown>");
1907 return 10000; /* Reschedule this destruction so that we know that it's gone */
1910 /* Reset schedule ID */
1914 ast_log(LOG_DEBUG, "Auto destroying call '%s'\n", p->callid);
1915 append_history(p, "AutoDestroy", "%s", p->callid);
1917 ast_log(LOG_WARNING, "Autodestruct on dialog '%s' with owner in place (Method: %s)\n", p->callid, sip_methods[p->method].text);
1918 ast_queue_hangup(p->owner);
1919 } else if (p->refer) {
1920 transmit_request_with_auth(p, SIP_BYE, 0, XMIT_RELIABLE, 1);
1927 /*! \brief Schedule destruction of SIP call */
1928 static void sip_scheddestroy(struct sip_pvt *p, int ms)
1930 if (sip_debug_test_pvt(p))
1931 ast_verbose("Scheduling destruction of SIP dialog '%s' in %d ms (Method: %s)\n", p->callid, ms, sip_methods[p->method].text);
1933 append_history(p, "SchedDestroy", "%d ms", ms);
1935 if (p->autokillid > -1)
1936 ast_sched_del(sched, p->autokillid);
1937 p->autokillid = ast_sched_add(sched, ms, __sip_autodestruct, p);
1940 /*! \brief Cancel destruction of SIP dialog */
1941 static void sip_cancel_destroy(struct sip_pvt *p)
1943 if (p->autokillid > -1) {
1944 ast_sched_del(sched, p->autokillid);
1945 append_history(p, "CancelDestroy", "");
1950 /*! \brief Acknowledges receipt of a packet and stops retransmission */
1951 static void __sip_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod, int reset)
1953 struct sip_pkt *cur, *prev = NULL;
1955 /* Just in case... */
1959 msg = sip_methods[sipmethod].text;
1961 ast_mutex_lock(&p->lock);
1962 for (cur = p->packets; cur; prev = cur, cur = cur->next) {
1963 if ((cur->seqno == seqno) && ((ast_test_flag(cur, FLAG_RESPONSE)) == resp) &&
1964 ((ast_test_flag(cur, FLAG_RESPONSE)) ||
1965 (!strncasecmp(msg, cur->data, strlen(msg)) && (cur->data[strlen(msg)] < 33)))) {
1966 if (!resp && (seqno == p->pendinginvite)) {
1967 ast_log(LOG_DEBUG, "Acked pending invite %d\n", p->pendinginvite);
1968 p->pendinginvite = 0;
1970 /* this is our baby */
1972 UNLINK(cur, p->packets, prev);
1973 if (cur->retransid > -1) {
1974 if (sipdebug && option_debug > 3)
1975 ast_log(LOG_DEBUG, "** SIP TIMER: Cancelling retransmit of packet (reply received) Retransid #%d\n", cur->retransid);
1976 ast_sched_del(sched, cur->retransid);
1983 ast_mutex_unlock(&p->lock);
1985 ast_log(LOG_DEBUG, "Stopping retransmission on '%s' of %s %d: Match %s\n", p->callid, resp ? "Response" : "Request", seqno, res ? "Not Found" : "Found");
1988 /*! \brief Pretend to ack all packets
1989 * maybe the lock on p is not strictly necessary but there might be a race */
1990 static void __sip_pretend_ack(struct sip_pvt *p)
1992 struct sip_pkt *cur = NULL;
1994 while (p->packets) {
1996 if (cur == p->packets) {
1997 ast_log(LOG_WARNING, "Have a packet that doesn't want to give up! %s\n", sip_methods[cur->method].text);
2001 method = (cur->method) ? cur->method : find_sip_method(cur->data);
2002 __sip_ack(p, cur->seqno, ast_test_flag(cur, FLAG_RESPONSE), method, FALSE);
2006 /*! \brief Acks receipt of packet, keep it around (used for provisional responses) */
2007 static int __sip_semi_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod)
2009 struct sip_pkt *cur;
2012 for (cur = p->packets; cur; cur = cur->next) {
2013 if (cur->seqno == seqno && ast_test_flag(cur, FLAG_RESPONSE) == resp &&
2014 (ast_test_flag(cur, FLAG_RESPONSE) || method_match(sipmethod, cur->data))) {
2015 /* this is our baby */
2016 if (cur->retransid > -1) {
2017 if (option_debug > 3 && sipdebug)
2018 ast_log(LOG_DEBUG, "*** SIP TIMER: Cancelling retransmission #%d - %s (got response)\n", cur->retransid, sip_methods[sipmethod].text);
2019 ast_sched_del(sched, cur->retransid);
2021 cur->retransid = -1;
2027 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");
2032 /*! \brief Copy SIP request, parse it */
2033 static void parse_copy(struct sip_request *dst, const struct sip_request *src)
2035 memset(dst, 0, sizeof(*dst));
2036 memcpy(dst->data, src->data, sizeof(dst->data));
2037 dst->len = src->len;
2041 /* add a blank line if no body */
2042 static void add_blank(struct sip_request *req)
2045 /* Add extra empty return. add_header() reserves 4 bytes so cannot be truncated */
2046 snprintf(req->data + req->len, sizeof(req->data) - req->len, "\r\n");
2047 req->len += strlen(req->data + req->len);
2051 /*! \brief Transmit response on SIP request*/
2052 static int send_response(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno)
2057 if (sip_debug_test_pvt(p)) {
2058 char iabuf[INET_ADDRSTRLEN];
2059 const struct sockaddr_in *dst = sip_real_dst(p);
2061 ast_verbose("%sTransmitting (%s) to %s:%d:\n%s\n---\n",
2062 reliable ? "Reliably " : "", sip_nat_mode(p),
2063 ast_inet_ntoa(iabuf, sizeof(iabuf), dst->sin_addr),
2064 ntohs(dst->sin_port), req->data);
2066 if (recordhistory) {
2067 struct sip_request tmp;
2068 parse_copy(&tmp, req);
2069 append_history(p, reliable ? "TxRespRel" : "TxResp", "%s / %s - %s", tmp.data, get_header(&tmp, "CSeq"),
2070 tmp.method == SIP_RESPONSE ? tmp.rlPart2 : sip_methods[tmp.method].text);
2073 __sip_reliable_xmit(p, seqno, 1, req->data, req->len, (reliable == XMIT_CRITICAL), req->method) :
2074 __sip_xmit(p, req->data, req->len);
2080 /*! \brief Send SIP Request to the other part of the dialogue */
2081 static int send_request(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno)
2086 if (sip_debug_test_pvt(p)) {
2087 char iabuf[INET_ADDRSTRLEN];
2088 if (ast_test_flag(&p->flags[0], SIP_NAT_ROUTE))
2089 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);
2091 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);
2093 if (recordhistory) {
2094 struct sip_request tmp;
2095 parse_copy(&tmp, req);
2096 append_history(p, reliable ? "TxReqRel" : "TxReq", "%s / %s - %s", tmp.data, get_header(&tmp, "CSeq"), sip_methods[tmp.method].text);
2099 __sip_reliable_xmit(p, seqno, 0, req->data, req->len, (reliable > 1), req->method) :
2100 __sip_xmit(p, req->data, req->len);
2104 /*! \brief Pick out text in brackets from character string
2105 \return pointer to terminated stripped string
2106 \param tmp input string that will be modified */
2107 static char *get_in_brackets(char *tmp)
2111 char *first_bracket;
2112 char *second_bracket;
2117 first_quote = strchr(parse, '"');
2118 first_bracket = strchr(parse, '<');
2119 if (first_quote && first_bracket && (first_quote < first_bracket)) {
2121 for (parse = first_quote + 1; *parse; parse++) {
2122 if ((*parse == '"') && (last_char != '\\'))
2127 ast_log(LOG_WARNING, "No closing quote found in '%s'\n", tmp);
2133 if (first_bracket) {
2134 second_bracket = strchr(first_bracket + 1, '>');
2135 if (second_bracket) {
2136 *second_bracket = '\0';
2137 return first_bracket + 1;
2139 ast_log(LOG_WARNING, "No closing bracket found in '%s'\n", tmp);
2147 /*! \brief Send SIP MESSAGE text within a call
2148 Called from PBX core sendtext() application */
2149 static int sip_sendtext(struct ast_channel *ast, const char *text)
2151 struct sip_pvt *p = ast->tech_pvt;
2152 int debug = sip_debug_test_pvt(p);
2155 ast_verbose("Sending text %s on %s\n", text, ast->name);
2158 if (ast_strlen_zero(text))
2161 ast_verbose("Really sending text %s on %s\n", text, ast->name);
2162 transmit_message_with_text(p, text);
2166 /*! \brief Update peer object in realtime storage */
2167 static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, const char *username, const char *fullcontact, int expirey)
2171 char regseconds[20];
2172 time_t nowtime = time(NULL) + expirey;
2173 const char *fc = fullcontact ? "fullcontact" : NULL;
2175 snprintf(regseconds, sizeof(regseconds), "%d", (int)nowtime); /* Expiration time */
2176 ast_inet_ntoa(ipaddr, sizeof(ipaddr), sin->sin_addr);
2177 snprintf(port, sizeof(port), "%d", ntohs(sin->sin_port));
2179 ast_update_realtime("sippeers", "name", peername, "ipaddr", ipaddr,
2180 "port", port, "regseconds", regseconds,
2181 "username", username, fc, fullcontact, NULL); /* note fc _can_ be NULL */
2184 /*! \brief Automatically add peer extension to dial plan */
2185 static void register_peer_exten(struct sip_peer *peer, int onoff)
2188 char *stringp, *ext, *context;
2190 /* XXX note that global_regcontext is both a global 'enable' flag and
2191 * the name of the global regexten context, if not specified
2194 if (ast_strlen_zero(global_regcontext))
2197 ast_copy_string(multi, S_OR(peer->regexten, peer->name), sizeof(multi));
2199 while ((ext = strsep(&stringp, "&"))) {
2200 if ((context = strchr(ext, '@'))) {
2201 *context++ = '\0'; /* split ext@context */
2202 if (!ast_context_find(context)) {
2203 ast_log(LOG_WARNING, "Context %s must exist in regcontext= in sip.conf!\n", context);
2207 context = global_regcontext;
2210 ast_add_extension(context, 1, ext, 1, NULL, NULL, "Noop",
2211 ast_strdup(peer->name), free, "SIP");
2213 ast_context_remove_extension(context, ext, 1, NULL);
2217 /*! \brief Destroy peer object from memory */
2218 static void sip_destroy_peer(struct sip_peer *peer)
2220 if (option_debug > 2)
2221 ast_log(LOG_DEBUG, "Destroying SIP peer %s\n", peer->name);
2223 /* Delete it, it needs to disappear */
2225 sip_destroy(peer->call);
2227 if (peer->mwipvt) { /* We have an active subscription, delete it */
2228 sip_destroy(peer->mwipvt);
2231 if (peer->chanvars) {
2232 ast_variables_destroy(peer->chanvars);
2233 peer->chanvars = NULL;
2235 if (peer->expire > -1)
2236 ast_sched_del(sched, peer->expire);
2237 if (peer->pokeexpire > -1)
2238 ast_sched_del(sched, peer->pokeexpire);
2239 register_peer_exten(peer, FALSE);
2240 ast_free_ha(peer->ha);
2241 if (ast_test_flag(&peer->flags[1], SIP_PAGE2_SELFDESTRUCT))
2243 else if (ast_test_flag(&peer->flags[0], SIP_REALTIME))
2247 clear_realm_authentication(peer->auth);
2250 ast_dnsmgr_release(peer->dnsmgr);
2254 /*! \brief Update peer data in database (if used) */
2255 static void update_peer(struct sip_peer *p, int expiry)
2257 int rtcachefriends = ast_test_flag(&p->flags[1], SIP_PAGE2_RTCACHEFRIENDS);
2258 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTUPDATE) &&
2259 (ast_test_flag(&p->flags[0], SIP_REALTIME) || rtcachefriends)) {
2260 realtime_update_peer(p->name, &p->addr, p->username, rtcachefriends ? p->fullcontact : NULL, expiry);
2265 /*! \brief realtime_peer: Get peer from realtime storage
2266 * Checks the "sippeers" realtime family from extconfig.conf
2267 * \todo Consider adding check of port address when matching here to follow the same
2268 * algorithm as for static peers. Will we break anything by adding that?
2270 static struct sip_peer *realtime_peer(const char *newpeername, struct sockaddr_in *sin)
2272 struct sip_peer *peer;
2273 struct ast_variable *var = NULL;
2274 struct ast_variable *tmp;
2277 /* First check on peer name */
2279 var = ast_load_realtime("sippeers", "name", newpeername, NULL);
2280 else if (sin) { /* Then check on IP address for dynamic peers */
2281 ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr);
2282 var = ast_load_realtime("sippeers", "host", iabuf, NULL); /* First check for fixed IP hosts */
2284 var = ast_load_realtime("sippeers", "ipaddr", iabuf, NULL); /* Then check for registred hosts */
2291 for (tmp = var; tmp; tmp = tmp->next) {
2292 /* If this is type=user, then skip this object. */
2293 if (!strcasecmp(tmp->name, "type") &&
2294 !strcasecmp(tmp->value, "user")) {
2295 ast_variables_destroy(var);
2297 } else if (!newpeername && !strcasecmp(tmp->name, "name")) {
2298 newpeername = tmp->value;
2302 if (!newpeername) { /* Did not find peer in realtime */
2303 ast_log(LOG_WARNING, "Cannot Determine peer name ip=%s\n", iabuf);
2304 ast_variables_destroy(var);
2308 /* Peer found in realtime, now build it in memory */
2309 peer = build_peer(newpeername, var, !ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS));
2311 ast_variables_destroy(var);
2315 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS)) {
2317 ast_copy_flags(&peer->flags[1],&global_flags[1], SIP_PAGE2_RTAUTOCLEAR|SIP_PAGE2_RTCACHEFRIENDS);
2318 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTAUTOCLEAR)) {
2319 if (peer->expire > -1) {
2320 ast_sched_del(sched, peer->expire);
2322 peer->expire = ast_sched_add(sched, (global_rtautoclear) * 1000, expire_register, (void *)peer);
2324 ASTOBJ_CONTAINER_LINK(&peerl,peer);
2326 ast_set_flag(&peer->flags[0], SIP_REALTIME);
2328 ast_variables_destroy(var);
2333 /*! \brief Support routine for find_peer */
2334 static int sip_addrcmp(char *name, struct sockaddr_in *sin)
2336 /* We know name is the first field, so we can cast */
2337 struct sip_peer *p = (struct sip_peer *) name;
2338 return !(!inaddrcmp(&p->addr, sin) ||
2339 (ast_test_flag(&p->flags[0], SIP_INSECURE_PORT) &&
2340 (p->addr.sin_addr.s_addr == sin->sin_addr.s_addr)));
2343 /*! \brief Locate peer by name or ip address
2344 * This is used on incoming SIP message to find matching peer on ip
2345 or outgoing message to find matching peer on name */
2346 static struct sip_peer *find_peer(const char *peer, struct sockaddr_in *sin, int realtime)
2348 struct sip_peer *p = NULL;
2351 p = ASTOBJ_CONTAINER_FIND(&peerl, peer);
2353 p = ASTOBJ_CONTAINER_FIND_FULL(&peerl, sin, name, sip_addr_hashfunc, 1, sip_addrcmp);
2355 if (!p && realtime) {
2356 p = realtime_peer(peer, sin);
2361 /*! \brief Remove user object from in-memory storage */
2362 static void sip_destroy_user(struct sip_user *user)
2364 if (option_debug > 2)
2365 ast_log(LOG_DEBUG, "Destroying user object from memory: %s\n", user->name);
2366 ast_free_ha(user->ha);
2367 if (user->chanvars) {
2368 ast_variables_destroy(user->chanvars);
2369 user->chanvars = NULL;
2371 if (ast_test_flag(&user->flags[0], SIP_REALTIME))
2378 /*! \brief Load user from realtime storage
2379 * Loads user from "sipusers" category in realtime (extconfig.conf)
2380 * Users are matched on From: user name (the domain in skipped) */
2381 static struct sip_user *realtime_user(const char *username)
2383 struct ast_variable *var;
2384 struct ast_variable *tmp;
2385 struct sip_user *user = NULL;
2387 var = ast_load_realtime("sipusers", "name", username, NULL);
2392 for (tmp = var; tmp; tmp = tmp->next) {
2393 if (!strcasecmp(tmp->name, "type") &&
2394 !strcasecmp(tmp->value, "peer")) {
2395 ast_variables_destroy(var);
2400 user = build_user(username, var, !ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS));
2402 if (!user) { /* No user found */
2403 ast_variables_destroy(var);
2407 if (ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS)) {
2408 ast_set_flag(&user->flags[1], SIP_PAGE2_RTCACHEFRIENDS);
2410 ASTOBJ_CONTAINER_LINK(&userl,user);
2412 /* Move counter from s to r... */
2415 ast_set_flag(&user->flags[0], SIP_REALTIME);
2417 ast_variables_destroy(var);
2421 /*! \brief Locate user by name
2422 * Locates user by name (From: sip uri user name part) first
2423 * from in-memory list (static configuration) then from
2424 * realtime storage (defined in extconfig.conf) */
2425 static struct sip_user *find_user(const char *name, int realtime)
2427 struct sip_user *u = ASTOBJ_CONTAINER_FIND(&userl, name);
2429 u = realtime_user(name);
2433 /*! \brief Create address structure from peer reference.
2434 * return -1 on error, 0 on success.
2436 static int create_addr_from_peer(struct sip_pvt *r, struct sip_peer *peer)
2440 if ((peer->addr.sin_addr.s_addr || peer->defaddr.sin_addr.s_addr) &&
2441 (!peer->maxms || ((peer->lastms >= 0) && (peer->lastms <= peer->maxms)))) {
2442 r->sa = (peer->addr.sin_addr.s_addr) ? peer->addr : peer->defaddr;
2448 ast_copy_flags(&r->flags[0], &peer->flags[0], SIP_FLAGS_TO_COPY);
2449 ast_copy_flags(&r->flags[1], &peer->flags[1], SIP_PAGE2_FLAGS_TO_COPY);
2450 r->capability = peer->capability;
2451 if (!ast_test_flag(&r->flags[1], SIP_PAGE2_VIDEOSUPPORT) && r->vrtp) {
2452 ast_rtp_destroy(r->vrtp);
2455 r->prefs = peer->prefs;
2456 if (ast_test_flag(&r->flags[1], SIP_PAGE2_T38SUPPORT)) {
2457 r->t38.capability = global_t38_capability;
2459 if (ast_udptl_get_error_correction_scheme(r->udptl) == UDPTL_ERROR_CORRECTION_FEC )
2460 r->t38.capability |= T38FAX_UDP_EC_FEC;
2461 else if (ast_udptl_get_error_correction_scheme(r->udptl) == UDPTL_ERROR_CORRECTION_REDUNDANCY )
2462 r->t38.capability |= T38FAX_UDP_EC_REDUNDANCY;
2463 else if (ast_udptl_get_error_correction_scheme(r->udptl) == UDPTL_ERROR_CORRECTION_NONE )
2464 r->t38.capability |= T38FAX_UDP_EC_NONE;
2465 r->t38.capability |= T38FAX_RATE_MANAGEMENT_TRANSFERED_TCF;
2466 if (option_debug > 1)
2467 ast_log(LOG_DEBUG,"Our T38 capability (%d)\n", r->t38.capability);
2469 r->t38.jointcapability = r->t38.capability;
2470 } else if (r->udptl) {
2471 ast_udptl_destroy(r->udptl);
2474 natflags = ast_test_flag(&r->flags[0], SIP_NAT) & SIP_NAT_ROUTE;
2477 ast_log(LOG_DEBUG, "Setting NAT on RTP to %s\n", natflags ? "On" : "Off");
2478 ast_rtp_setnat(r->rtp, natflags);
2479 ast_rtp_setdtmf(r->rtp, ast_test_flag(&r->flags[0], SIP_DTMF) != SIP_DTMF_INFO);
2483 ast_log(LOG_DEBUG, "Setting NAT on VRTP to %s\n", natflags ? "On" : "Off");
2484 ast_rtp_setnat(r->vrtp, natflags);
2485 ast_rtp_setdtmf(r->vrtp, 0);
2489 ast_log(LOG_DEBUG, "Setting NAT on UDPTL to %s\n", natflags ? "On" : "Off");
2490 ast_udptl_setnat(r->udptl, natflags);
2492 ast_string_field_set(r, peername, peer->username);
2493 ast_string_field_set(r, authname, peer->username);
2494 ast_string_field_set(r, username, peer->username);
2495 ast_string_field_set(r, peersecret, peer->secret);
2496 ast_string_field_set(r, peermd5secret, peer->md5secret);
2497 ast_string_field_set(r, tohost, peer->tohost);
2498 ast_string_field_set(r, fullcontact, peer->fullcontact);
2499 if (!r->initreq.headers && !ast_strlen_zero(peer->fromdomain)) {
2502 tmpcall = ast_strdupa(r->callid);
2503 c = strchr(tmpcall, '@');
2506 ast_string_field_build(r, callid, "%s@%s", tmpcall, peer->fromdomain);
2509 if (ast_strlen_zero(r->tohost)) {
2510 char iabuf[INET_ADDRSTRLEN];
2512 ast_inet_ntoa(iabuf, sizeof(iabuf), r->sa.sin_addr);
2513 ast_string_field_set(r, tohost, iabuf);
2515 if (!ast_strlen_zero(peer->fromdomain))
2516 ast_string_field_set(r, fromdomain, peer->fromdomain);
2517 if (!ast_strlen_zero(peer->fromuser))
2518 ast_string_field_set(r, fromuser, peer->fromuser);
2519 r->maxtime = peer->maxms;
2520 r->callgroup = peer->callgroup;
2521 r->pickupgroup = peer->pickupgroup;
2522 r->allowtransfer = peer->allowtransfer;
2523 /* Set timer T1 to RTT for this peer (if known by qualify=) */
2524 /* Minimum is settable or default to 100 ms */
2525 if (peer->maxms && peer->lastms)
2526 r->timer_t1 = peer->lastms < global_t1min ? global_t1min : peer->lastms;
2527 if ((ast_test_flag(&r->flags[0], SIP_DTMF) == SIP_DTMF_RFC2833) ||
2528 (ast_test_flag(&r->flags[0], SIP_DTMF) == SIP_DTMF_AUTO))
2529 r->noncodeccapability |= AST_RTP_DTMF;
2531 r->noncodeccapability &= ~AST_RTP_DTMF;
2532 ast_string_field_set(r, context, peer->context);
2533 r->rtptimeout = peer->rtptimeout;
2534 r->rtpholdtimeout = peer->rtpholdtimeout;
2535 r->rtpkeepalive = peer->rtpkeepalive;
2536 if (peer->call_limit)
2537 ast_set_flag(&r->flags[0], SIP_CALL_LIMIT);
2538 r->maxcallbitrate = peer->maxcallbitrate;
2543 /*! \brief create address structure from peer name
2544 * Or, if peer not found, find it in the global DNS
2545 * returns TRUE (-1) on failure, FALSE on success */
2546 static int create_addr(struct sip_pvt *dialog, const char *opeer)
2549 struct ast_hostent ahp;
2553 char host[MAXHOSTNAMELEN], *hostn;
2556 ast_copy_string(peer, opeer, sizeof(peer));
2557 port = strchr(peer, ':');
2560 dialog->sa.sin_family = AF_INET;
2561 dialog->timer_t1 = 500; /* Default SIP retransmission timer T1 (RFC 3261) */
2562 p = find_peer(peer, NULL, 1);
2565 int res = create_addr_from_peer(dialog, p);
2566 ASTOBJ_UNREF(p, sip_destroy_peer);
2570 portno = port ? atoi(port) : DEFAULT_SIP_PORT;
2572 char service[MAXHOSTNAMELEN];
2576 snprintf(service, sizeof(service), "_sip._udp.%s", peer);
2577 ret = ast_get_srv(NULL, host, sizeof(host), &tportno, service);
2583 hp = ast_gethostbyname(hostn, &ahp);
2585 ast_log(LOG_WARNING, "No such host: %s\n", peer);
2588 ast_string_field_set(dialog, tohost, peer);
2589 memcpy(&dialog->sa.sin_addr, hp->h_addr, sizeof(dialog->sa.sin_addr));
2590 dialog->sa.sin_port = htons(portno);
2591 dialog->recv = dialog->sa;
2595 /*! \brief Scheduled congestion on a call */
2596 static int auto_congest(void *nothing)
2598 struct sip_pvt *p = nothing;
2600 ast_mutex_lock(&p->lock);
2603 /* XXX fails on possible deadlock */
2604 if (!ast_channel_trylock(p->owner)) {
2605 ast_log(LOG_NOTICE, "Auto-congesting %s\n", p->owner->name);
2606 append_history(p, "Cong", "Auto-congesting (timer)");
2607 ast_queue_control(p->owner, AST_CONTROL_CONGESTION);
2608 ast_channel_unlock(p->owner);
2611 ast_mutex_unlock(&p->lock);
2616 /*! \brief Initiate SIP call from PBX
2617 * used from the dial() application */
2618 static int sip_call(struct ast_channel *ast, char *dest, int timeout)
2622 struct varshead *headp;
2623 struct ast_var_t *current;
2624 const char *referer = NULL; /* SIP refererer */
2627 if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
2628 ast_log(LOG_WARNING, "sip_call called on %s, neither down nor reserved\n", ast->name);
2632 /* Check whether there is vxml_url, distinctive ring variables */
2633 headp=&ast->varshead;
2634 AST_LIST_TRAVERSE(headp,current,entries) {
2635 /* Check whether there is a VXML_URL variable */
2636 if (!p->options->vxml_url && !strcasecmp(ast_var_name(current), "VXML_URL")) {
2637 p->options->vxml_url = ast_var_value(current);
2638 } else if (!p->options->uri_options && !strcasecmp(ast_var_name(current), "SIP_URI_OPTIONS")) {
2639 p->options->uri_options = ast_var_value(current);
2640 } else if (!p->options->distinctive_ring && !strcasecmp(ast_var_name(current), "ALERT_INFO")) {
2641 /* Check whether there is a ALERT_INFO variable */
2642 p->options->distinctive_ring = ast_var_value(current);
2643 } else if (!p->options->addsipheaders && !strncasecmp(ast_var_name(current), "SIPADDHEADER", strlen("SIPADDHEADER"))) {
2644 /* Check whether there is a variable with a name starting with SIPADDHEADER */
2645 p->options->addsipheaders = 1;
2646 } else if (!strcasecmp(ast_var_name(current),"SIPTRANSFER")) {
2647 /* This is a transfered call */
2648 p->options->transfer = 1;
2649 } else if (!strcasecmp(ast_var_name(current),"SIPTRANSFER_REFERER")) {
2650 /* This is the referer */
2651 referer = ast_var_value(current);
2652 } else if (!strcasecmp(ast_var_name(current),"SIPTRANSFER_REPLACES")) {
2653 /* We're replacing a call. */
2654 p->options->replaces = ast_var_value(current);
2655 } else if (!strcasecmp(ast_var_name(current),"T38CALL")) {
2656 p->t38.state = T38_LOCAL_DIRECT;
2658 ast_log(LOG_DEBUG,"T38State change to %d on channel %s\n", p->t38.state, ast->name);
2664 ast_set_flag(&p->flags[0], SIP_OUTGOING);
2666 if (p->options->transfer) {
2670 if (sipdebug && option_debug > 2)
2671 ast_log(LOG_DEBUG, "Call for %s transfered by %s\n", p->username, referer);
2672 snprintf(buf, sizeof(buf)-1, "-> %s (via %s)", p->cid_name, referer);
2674 snprintf(buf, sizeof(buf)-1, "-> %s", p->cid_name);
2676 ast_string_field_set(p, cid_name, buf);
2679 ast_log(LOG_DEBUG, "Outgoing Call for %s\n", p->username);
2681 res = update_call_counter(p, INC_CALL_RINGING);
2683 p->callingpres = ast->cid.cid_pres;
2684 p->jointcapability = p->capability;
2685 p->t38.jointcapability = p->t38.capability;
2687 ast_log(LOG_DEBUG,"Our T38 capability (%d), joint T38 capability (%d)\n", p->t38.capability, p->t38.jointcapability);
2688 transmit_invite(p, SIP_INVITE, 1, 2);
2690 /* Initialize auto-congest time */
2691 p->initid = ast_sched_add(sched, p->maxtime * 4, auto_congest, p);
2693 p->initid = ast_sched_add(sched, SIP_TRANS_TIMEOUT, auto_congest, p);
2699 /*! \brief Destroy registry object
2700 Objects created with the register= statement in static configuration */
2701 static void sip_registry_destroy(struct sip_registry *reg)
2704 if (option_debug > 2)
2705 ast_log(LOG_DEBUG, "Destroying registry entry for %s@%s\n", reg->username, reg->hostname);
2708 /* Clear registry before destroying to ensure
2709 we don't get reentered trying to grab the registry lock */
2710 reg->call->registry = NULL;
2711 if (option_debug > 2)
2712 ast_log(LOG_DEBUG, "Destroying active SIP dialog for registry %s@%s\n", reg->username, reg->hostname);
2713 sip_destroy(reg->call);
2715 if (reg->expire > -1)
2716 ast_sched_del(sched, reg->expire);
2717 if (reg->timeout > -1)
2718 ast_sched_del(sched, reg->timeout);
2719 ast_string_field_free_all(reg);
2725 /*! \brief Execute destruction of SIP dialog structure, release memory */
2726 static void __sip_destroy(struct sip_pvt *p, int lockowner)
2728 struct sip_pvt *cur, *prev = NULL;
2731 if (sip_debug_test_pvt(p) || option_debug > 2)
2732 ast_verbose("Really destroying SIP dialog '%s' Method: %s\n", p->callid, sip_methods[p->method].text);
2734 /* Remove link from peer to subscription of MWI */
2735 if (p->relatedpeer && p->relatedpeer->mwipvt)
2736 p->relatedpeer->mwipvt = NULL;
2739 sip_dump_history(p);
2744 if (p->stateid > -1)
2745 ast_extension_state_del(p->stateid, NULL);
2747 ast_sched_del(sched, p->initid);
2748 if (p->autokillid > -1)
2749 ast_sched_del(sched, p->autokillid);
2752 ast_rtp_destroy(p->rtp);
2754 ast_rtp_destroy(p->vrtp);
2756 ast_udptl_destroy(p->udptl);
2760 free_old_route(p->route);
2764 if (p->registry->call == p)
2765 p->registry->call = NULL;
2766 ASTOBJ_UNREF(p->registry, sip_registry_destroy);
2769 /* Unlink us from the owner if we have one */
2772 ast_channel_lock(p->owner);
2774 ast_log(LOG_DEBUG, "Detaching from %s\n", p->owner->name);
2775 p->owner->tech_pvt = NULL;
2777 ast_channel_unlock(p->owner);
2781 struct sip_history *hist;
2782 while( (hist = AST_LIST_REMOVE_HEAD(p->history, list)) )
2788 for (prev = NULL, cur = iflist; cur; prev = cur, cur = cur->next) {
2790 UNLINK(cur, iflist, prev);
2795 ast_log(LOG_WARNING, "Trying to destroy \"%s\", not found in dialog list?!?! \n", p->callid);
2799 ast_sched_del(sched, p->initid);
2801 /* remove all current packets in this dialog */
2802 while((cp = p->packets)) {
2803 p->packets = p->packets->next;
2804 if (cp->retransid > -1)
2805 ast_sched_del(sched, cp->retransid);
2809 ast_variables_destroy(p->chanvars);
2812 ast_mutex_destroy(&p->lock);
2814 ast_string_field_free_all(p);
2819 /*! \brief update_call_counter: Handle call_limit for SIP users
2820 * Setting a call-limit will cause calls above the limit not to be accepted.
2822 * Remember that for a type=friend, there's one limit for the user and
2823 * another for the peer, not a combined call limit.
2824 * This will cause unexpected behaviour in subscriptions, since a "friend"
2825 * is *two* devices in Asterisk, not one.
2827 * Thought: For realtime, we should propably update storage with inuse counter...
2829 * \return 0 if call is ok (no call limit, below treshold)
2830 * -1 on rejection of call
2833 static int update_call_counter(struct sip_pvt *fup, int event)
2836 int *inuse, *call_limit, *inringing = NULL;
2837 int outgoing = ast_test_flag(&fup->flags[0], SIP_OUTGOING);
2838 struct sip_user *u = NULL;
2839 struct sip_peer *p = NULL;
2841 if (option_debug > 2)
2842 ast_log(LOG_DEBUG, "Updating call counter for %s call\n", outgoing ? "outgoing" : "incoming");
2843 /* Test if we need to check call limits, in order to avoid
2844 realtime lookups if we do not need it */
2845 if (!ast_test_flag(&fup->flags[0], SIP_CALL_LIMIT))
2848 ast_copy_string(name, fup->username, sizeof(name));
2850 /* Check the list of users */
2851 if (!outgoing) /* Only check users for incoming calls */
2852 u = find_user(name, 1);
2856 call_limit = &u->call_limit;
2859 /* Try to find peer */
2861 p = find_peer(fup->peername, NULL, 1);
2864 call_limit = &p->call_limit;
2865 inringing = &p->inRinging;
2866 ast_copy_string(name, fup->peername, sizeof(name));
2868 if (option_debug > 1)
2869 ast_log(LOG_DEBUG, "%s is not a local device, no call limit\n", name);
2874 /* incoming and outgoing affects the inUse counter */
2875 case DEC_CALL_LIMIT:
2877 if (ast_test_flag(&fup->flags[0], SIP_INC_COUNT))
2883 if (ast_test_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING)) {
2887 ast_log(LOG_WARNING, "Inringing for peer '%s' < 0?\n", fup->peername);
2888 ast_clear_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING);
2891 if (option_debug > 1 || sipdebug) {
2892 ast_log(LOG_DEBUG, "Call %s %s '%s' removed from call limit %d\n", outgoing ? "to" : "from", u ? "user":"peer", name, *call_limit);
2895 case INC_CALL_RINGING:
2896 case INC_CALL_LIMIT:
2897 if (*call_limit > 0 ) {
2898 if (*inuse >= *call_limit) {
2899 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);
2901 ASTOBJ_UNREF(u, sip_destroy_user);
2903 ASTOBJ_UNREF(p, sip_destroy_peer);
2907 if (inringing && (event == INC_CALL_RINGING)) {
2908 if (!ast_test_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING)) {
2910 ast_set_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING);
2915 ast_set_flag(&fup->flags[0], SIP_INC_COUNT);
2916 if (option_debug > 1 || sipdebug) {
2917 ast_log(LOG_DEBUG, "Call %s %s '%s' is %d out of %d\n", outgoing ? "to" : "from", u ? "user":"peer", name, *inuse, *call_limit);
2920 case DEC_CALL_RINGING:
2922 if (ast_test_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING)) {
2926 ast_log(LOG_WARNING, "Inringing for peer '%s' < 0?\n", p->name);
2927 ast_clear_flag(&fup->flags[1], SIP_PAGE2_INC_RINGING);
2932 ast_log(LOG_ERROR, "update_call_counter(%s, %d) called with no event!\n", name, event);
2935 ast_device_state_changed("SIP/%s", p->name);
2937 ASTOBJ_UNREF(u, sip_destroy_user);
2939 ASTOBJ_UNREF(p, sip_destroy_peer);
2943 /*! \brief Destroy SIP call structure */
2944 static void sip_destroy(struct sip_pvt *p)
2946 ast_mutex_lock(&iflock);
2947 if (option_debug > 2)
2948 ast_log(LOG_DEBUG, "Destroying SIP dialog %s\n", p->callid);
2949 __sip_destroy(p, 1);
2950 ast_mutex_unlock(&iflock);
2953 /*! \brief Convert SIP hangup causes to Asterisk hangup causes */
2954 static int hangup_sip2cause(int cause)
2956 /* Possible values taken from causes.h */
2959 case 401: /* Unauthorized */
2960 return AST_CAUSE_CALL_REJECTED;
2961 case 403: /* Not found */
2962 return AST_CAUSE_CALL_REJECTED;
2963 case 404: /* Not found */
2964 return AST_CAUSE_UNALLOCATED;
2965 case 405: /* Method not allowed */
2966 return AST_CAUSE_INTERWORKING;
2967 case 407: /* Proxy authentication required */
2968 return AST_CAUSE_CALL_REJECTED;
2969 case 408: /* No reaction */
2970 return AST_CAUSE_NO_USER_RESPONSE;
2971 case 409: /* Conflict */
2972 return AST_CAUSE_NORMAL_TEMPORARY_FAILURE;
2973 case 410: /* Gone */
2974 return AST_CAUSE_UNALLOCATED;
2975 case 411: /* Length required */
2976 return AST_CAUSE_INTERWORKING;
2977 case 413: /* Request entity too large */
2978 return AST_CAUSE_INTERWORKING;
2979 case 414: /* Request URI too large */
2980 return AST_CAUSE_INTERWORKING;
2981 case 415: /* Unsupported media type */
2982 return AST_CAUSE_INTERWORKING;
2983 case 420: /* Bad extension */
2984 return AST_CAUSE_NO_ROUTE_DESTINATION;
2985 case 480: /* No answer */
2986 return AST_CAUSE_NO_ANSWER;
2987 case 481: /* No answer */
2988 return AST_CAUSE_INTERWORKING;
2989 case 482: /* Loop detected */
2990 return AST_CAUSE_INTERWORKING;
2991 case 483: /* Too many hops */
2992 return AST_CAUSE_NO_ANSWER;
2993 case 484: /* Address incomplete */
2994 return AST_CAUSE_INVALID_NUMBER_FORMAT;
2995 case 485: /* Ambigous */
2996 return AST_CAUSE_UNALLOCATED;
2997 case 486: /* Busy everywhere */
2998 return AST_CAUSE_BUSY;
2999 case 487: /* Request terminated */
3000 return AST_CAUSE_INTERWORKING;
3001 case 488: /* No codecs approved */
3002 return AST_CAUSE_BEARERCAPABILITY_NOTAVAIL;
3003 case 491: /* Request pending */
3004 return AST_CAUSE_INTERWORKING;
3005 case 493: /* Undecipherable */
3006 return AST_CAUSE_INTERWORKING;
3007 case 500: /* Server internal failure */
3008 return AST_CAUSE_FAILURE;
3009 case 501: /* Call rejected */
3010 return AST_CAUSE_FACILITY_REJECTED;
3012 return AST_CAUSE_DESTINATION_OUT_OF_ORDER;
3013 case 503: /* Service unavailable */
3014 return AST_CAUSE_CONGESTION;
3015 case 504: /* Gateway timeout */
3016 return AST_CAUSE_RECOVERY_ON_TIMER_EXPIRE;
3017 case 505: /* SIP version not supported */
3018 return AST_CAUSE_INTERWORKING;
3019 case 600: /* Busy everywhere */
3020 return AST_CAUSE_USER_BUSY;
3021 case 603: /* Decline */
3022 return AST_CAUSE_CALL_REJECTED;
3023 case 604: /* Does not exist anywhere */
3024 return AST_CAUSE_UNALLOCATED;
3025 case 606: /* Not acceptable */
3026 return AST_CAUSE_BEARERCAPABILITY_NOTAVAIL;
3028 return AST_CAUSE_NORMAL;