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, and experimental TCP and TLS support
29 * Configuration file \link Config_sip sip.conf \endlink
31 * ********** IMPORTANT *
32 * \note TCP/TLS support is EXPERIMENTAL and WILL CHANGE. This applies to configuration
33 * settings, dialplan commands and dialplans apps/functions
34 * See \ref sip_tcp_tls
37 * ******** General TODO:s
38 * \todo Better support of forking
39 * \todo VIA branch tag transaction checking
40 * \todo Transaction support
42 * ******** Wishlist: Improvements
43 * - Support of SIP domains for devices, so that we match on username@domain in the From: header
44 * - Connect registrations with a specific device on the incoming call. It's not done
45 * automatically in Asterisk
47 * \ingroup channel_drivers
49 * \par Overview of the handling of SIP sessions
50 * The SIP channel handles several types of SIP sessions, or dialogs,
51 * not all of them being "telephone calls".
52 * - Incoming calls that will be sent to the PBX core
53 * - Outgoing calls, generated by the PBX
54 * - SIP subscriptions and notifications of states and voicemail messages
55 * - SIP registrations, both inbound and outbound
56 * - SIP peer management (peerpoke, OPTIONS)
59 * In the SIP channel, there's a list of active SIP dialogs, which includes
60 * all of these when they are active. "sip show channels" in the CLI will
61 * show most of these, excluding subscriptions which are shown by
62 * "sip show subscriptions"
64 * \par incoming packets
65 * Incoming packets are received in the monitoring thread, then handled by
66 * sipsock_read() for udp only. In tcp, packets are read by the tcp_helper thread.
67 * sipsock_read() function parses the packet and matches an existing
68 * dialog or starts a new SIP dialog.
70 * sipsock_read sends the packet to handle_incoming(), that parses a bit more.
71 * If it is a response to an outbound request, the packet is sent to handle_response().
72 * If it is a request, handle_incoming() sends it to one of a list of functions
73 * depending on the request type - INVITE, OPTIONS, REFER, BYE, CANCEL etc
74 * sipsock_read locks the ast_channel if it exists (an active call) and
75 * unlocks it after we have processed the SIP message.
77 * A new INVITE is sent to handle_request_invite(), that will end up
78 * starting a new channel in the PBX, the new channel after that executing
79 * in a separate channel thread. This is an incoming "call".
80 * When the call is answered, either by a bridged channel or the PBX itself
81 * the sip_answer() function is called.
83 * The actual media - Video or Audio - is mostly handled by the RTP subsystem
87 * Outbound calls are set up by the PBX through the sip_request_call()
88 * function. After that, they are activated by sip_call().
91 * The PBX issues a hangup on both incoming and outgoing calls through
92 * the sip_hangup() function
96 * \page sip_tcp_tls SIP TCP and TLS support
98 * \par tcpfixes TCP implementation changes needed
99 * \todo Fix TCP/TLS handling in dialplan, SRV records, transfers and much more
100 * \todo Save TCP/TLS sessions in registry
101 * If someone registers a SIPS uri, this forces us to set up a TLS connection back.
102 * \todo Add TCP/TLS information to function SIPPEER and SIPCHANINFO
103 * \todo If tcpenable=yes, we must open a TCP socket on the same address as the IP for UDP.
104 * The tcpbindaddr config option should only be used to open ADDITIONAL ports
105 * So we should propably go back to
106 * bindaddr= the default address to bind to. If tcpenable=yes, then bind this to both udp and TCP
107 * if tlsenable=yes, open TLS port (provided we also have cert)
108 * tcpbindaddr = extra address for additional TCP connections
109 * tlsbindaddr = extra address for additional TCP/TLS connections
110 * udpbindaddr = extra address for additional UDP connections
111 * These three options should take multiple IP/port pairs
112 * Note: Since opening additional listen sockets is a *new* feature we do not have today
113 * the XXXbindaddr options needs to be disabled until we have support for it
115 * \todo re-evaluate the transport= setting in sip.conf. This is right now not well
116 * thought of. If a device in sip.conf contacts us via TCP, we should not switch transport,
117 * even if udp is the configured first transport.
119 * \todo Be prepared for one outbound and another incoming socket per pvt. This applies
120 * specially to communication with other peers (proxies).
121 * \todo We need to test TCP sessions with SIP proxies and in regards
122 * to the SIP outbound specs.
123 * \todo ;transport=tls was deprecated in RFC3261 and should not be used at all. See section 26.2.2.
125 * \todo If the message is smaller than the given Content-length, the request should get a 400 Bad request
126 * message. If it's a response, it should be dropped. (RFC 3261, Section 18.3)
127 * \todo Since we have had multidomain support in Asterisk for quite a while, we need to support
128 * multiple domains in our TLS implementation, meaning one socket and one cert per domain
129 * \todo Selection of transport for a request needs to be done after we've parsed all route headers,
130 * also considering outbound proxy options.
131 * First request: Outboundproxy, routes, (reg contact or URI. If URI doesn't have port: DNS naptr, srv, AAA)
132 * Intermediate requests: Outboundproxy(only when forced), routes, contact/uri
133 * DNS naptr support is crucial. A SIP uri might lead to a TLS connection.
134 * Also note that due to outbound proxy settings, a SIPS uri might have to be sent on UDP (not to recommend though)
135 * \todo Default transports are set to UDP, which cause the wrong behaviour when contacting remote
136 * devices directly from the dialplan. UDP is only a fallback if no other method works,
137 * in order to be compatible with RFC2543 (SIP/1.0) devices. For transactions that exceed the
138 * MTU (like INIVTE with video, audio and RTT) TCP should be preferred.
140 * When dialling unconfigured peers (with no port number) or devices in external domains
141 * NAPTR records MUST be consulted to find configured transport. If they are not found,
142 * SRV records for both TCP and UDP should be checked. If there's a record for TCP, use that.
143 * If there's no record for TCP, then use UDP as a last resort. If there's no SRV records,
144 * \note this only applies if there's no outbound proxy configured for the session. If an outbound
145 * proxy is configured, these procedures might apply for locating the proxy and determining
146 * the transport to use for communication with the proxy.
147 * \par Other bugs to fix ----
148 * __set_address_from_contact(const char *fullcontact, struct sockaddr_in *sin, int tcp)
149 * - sets TLS port as default for all TCP connections, unless other port is given in contact.
150 * parse_register_contact(struct sip_pvt *pvt, struct sip_peer *peer, struct sip_request *req)
151 * - assumes that the contact the UA registers is using the same transport as the REGISTER request, which is
153 * - Does not save any information about TCP/TLS connected devices, which is a severe BUG, as discussed on the mailing list.
154 * get_destination(struct sip_pvt *p, struct sip_request *oreq)
155 * - Doesn't store the information that we got an incoming SIPS request in the channel, so that
156 * we can require a secure signalling path OUT of Asterisk (on SIP or IAX2). Possibly, the call should
157 * fail on in-secure signalling paths if there's no override in our configuration. At least, provide a
158 * channel variable in the dialplan.
159 * get_refer_info(struct sip_pvt *transferer, struct sip_request *outgoing_req)
160 * - As above, if we have a SIPS: uri in the refer-to header
161 * - Does not check transport in refer_to uri.
165 <depend>chan_local</depend>
168 /*! \page sip_session_timers SIP Session Timers in Asterisk Chan_sip
170 The SIP Session-Timers is an extension of the SIP protocol that allows end-points and proxies to
171 refresh a session periodically. The sessions are kept alive by sending a RE-INVITE or UPDATE
172 request at a negotiated interval. If a session refresh fails then all the entities that support Session-
173 Timers clear their internal session state. In addition, UAs generate a BYE request in order to clear
174 the state in the proxies and the remote UA (this is done for the benefit of SIP entities in the path
175 that do not support Session-Timers).
177 The Session-Timers can be configured on a system-wide, per-user, or per-peer basis. The peruser/
178 per-peer settings override the global settings. The following new parameters have been
179 added to the sip.conf file.
180 session-timers=["accept", "originate", "refuse"]
181 session-expires=[integer]
182 session-minse=[integer]
183 session-refresher=["uas", "uac"]
185 The session-timers parameter in sip.conf defines the mode of operation of SIP session-timers feature in
186 Asterisk. The Asterisk can be configured in one of the following three modes:
188 1. Accept :: In the "accept" mode, the Asterisk server honors session-timers requests
189 made by remote end-points. A remote end-point can request Asterisk to engage
190 session-timers by either sending it an INVITE request with a "Supported: timer"
191 header in it or by responding to Asterisk's INVITE with a 200 OK that contains
192 Session-Expires: header in it. In this mode, the Asterisk server does not
193 request session-timers from remote end-points. This is the default mode.
194 2. Originate :: In the "originate" mode, the Asterisk server requests the remote
195 end-points to activate session-timers in addition to honoring such requests
196 made by the remote end-pints. In order to get as much protection as possible
197 against hanging SIP channels due to network or end-point failures, Asterisk
198 resends periodic re-INVITEs even if a remote end-point does not support
199 the session-timers feature.
200 3. Refuse :: In the "refuse" mode, Asterisk acts as if it does not support session-
201 timers for inbound or outbound requests. If a remote end-point requests
202 session-timers in a dialog, then Asterisk ignores that request unless it's
203 noted as a requirement (Require: header), in which case the INVITE is
204 rejected with a 420 Bad Extension response.
208 #include "asterisk.h"
210 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
213 #include <sys/signal.h>
216 #include "asterisk/network.h"
217 #include "asterisk/paths.h" /* need ast_config_AST_SYSTEM_NAME */
219 #include "asterisk/lock.h"
220 #include "asterisk/channel.h"
221 #include "asterisk/config.h"
222 #include "asterisk/module.h"
223 #include "asterisk/pbx.h"
224 #include "asterisk/sched.h"
225 #include "asterisk/io.h"
226 #include "asterisk/rtp_engine.h"
227 #include "asterisk/udptl.h"
228 #include "asterisk/acl.h"
229 #include "asterisk/manager.h"
230 #include "asterisk/callerid.h"
231 #include "asterisk/cli.h"
232 #include "asterisk/app.h"
233 #include "asterisk/musiconhold.h"
234 #include "asterisk/dsp.h"
235 #include "asterisk/features.h"
236 #include "asterisk/srv.h"
237 #include "asterisk/astdb.h"
238 #include "asterisk/causes.h"
239 #include "asterisk/utils.h"
240 #include "asterisk/file.h"
241 #include "asterisk/astobj.h"
243 Uncomment the define below, if you are having refcount related memory leaks.
244 With this uncommented, this module will generate a file, /tmp/refs, which contains
245 a history of the ao2_ref() calls. To be useful, all calls to ao2_* functions should
246 be modified to ao2_t_* calls, and include a tag describing what is happening with
247 enough detail, to make pairing up a reference count increment with its corresponding decrement.
248 The refcounter program in utils/ can be invaluable in highlighting objects that are not
249 balanced, along with the complete history for that object.
250 In normal operation, the macros defined will throw away the tags, so they do not
251 affect the speed of the program at all. They can be considered to be documentation.
253 /* #define REF_DEBUG 1 */
254 #include "asterisk/astobj2.h"
255 #include "asterisk/dnsmgr.h"
256 #include "asterisk/devicestate.h"
257 #include "asterisk/linkedlists.h"
258 #include "asterisk/stringfields.h"
259 #include "asterisk/monitor.h"
260 #include "asterisk/netsock.h"
261 #include "asterisk/localtime.h"
262 #include "asterisk/abstract_jb.h"
263 #include "asterisk/threadstorage.h"
264 #include "asterisk/translate.h"
265 #include "asterisk/ast_version.h"
266 #include "asterisk/event.h"
267 #include "asterisk/tcptls.h"
268 #include "asterisk/stun.h"
269 #include "asterisk/cel.h"
270 #include "asterisk/strings.h"
273 <application name="SIPDtmfMode" language="en_US">
275 Change the dtmfmode for a SIP call.
278 <parameter name="mode" required="true">
280 <enum name="inband" />
282 <enum name="rfc2833" />
287 <para>Changes the dtmfmode for a SIP call.</para>
290 <application name="SIPAddHeader" language="en_US">
292 Add a SIP header to the outbound call.
295 <parameter name="Header" required="true" />
296 <parameter name="Content" required="true" />
299 <para>Adds a header to a SIP call placed with DIAL.</para>
300 <para>Remember to use the X-header if you are adding non-standard SIP
301 headers, like <literal>X-Asterisk-Accountcode:</literal>. Use this with care.
302 Adding the wrong headers may jeopardize the SIP dialog.</para>
303 <para>Always returns <literal>0</literal>.</para>
306 <application name="SIPRemoveHeader" language="en_US">
308 Remove SIP headers previously added with SIPAddHeader
311 <parameter name="Header" required="false" />
314 <para>SIPRemoveHeader() allows you to remove headers which were previously
315 added with SIPAddHeader(). If no parameter is supplied, all previously added
316 headers will be removed. If a parameter is supplied, only the matching headers
317 will be removed.</para>
318 <para>For example you have added these 2 headers:</para>
319 <para>SIPAddHeader(P-Asserted-Identity: sip:foo@bar);</para>
320 <para>SIPAddHeader(P-Preferred-Identity: sip:bar@foo);</para>
322 <para>// remove all headers</para>
323 <para>SIPRemoveHeader();</para>
324 <para>// remove all P- headers</para>
325 <para>SIPRemoveHeader(P-);</para>
326 <para>// remove only the PAI header (note the : at the end)</para>
327 <para>SIPRemoveHeader(P-Asserted-Identity:);</para>
329 <para>Always returns <literal>0</literal>.</para>
332 <function name="SIP_HEADER" language="en_US">
334 Gets the specified SIP header.
337 <parameter name="name" required="true" />
338 <parameter name="number">
339 <para>If not specified, defaults to <literal>1</literal>.</para>
343 <para>Since there are several headers (such as Via) which can occur multiple
344 times, SIP_HEADER takes an optional second argument to specify which header with
345 that name to retrieve. Headers start at offset <literal>1</literal>.</para>
348 <function name="SIPPEER" language="en_US">
350 Gets SIP peer information.
353 <parameter name="peername" required="true" />
354 <parameter name="item">
357 <para>(default) The ip address.</para>
360 <para>The port number.</para>
362 <enum name="mailbox">
363 <para>The configured mailbox.</para>
365 <enum name="context">
366 <para>The configured context.</para>
369 <para>The epoch time of the next expire.</para>
371 <enum name="dynamic">
372 <para>Is it dynamic? (yes/no).</para>
374 <enum name="callerid_name">
375 <para>The configured Caller ID name.</para>
377 <enum name="callerid_num">
378 <para>The configured Caller ID number.</para>
380 <enum name="callgroup">
381 <para>The configured Callgroup.</para>
383 <enum name="pickupgroup">
384 <para>The configured Pickupgroup.</para>
387 <para>The configured codecs.</para>
390 <para>Status (if qualify=yes).</para>
392 <enum name="regexten">
393 <para>Registration extension.</para>
396 <para>Call limit (call-limit).</para>
398 <enum name="busylevel">
399 <para>Configured call level for signalling busy.</para>
401 <enum name="curcalls">
402 <para>Current amount of calls. Only available if call-limit is set.</para>
404 <enum name="language">
405 <para>Default language for peer.</para>
407 <enum name="accountcode">
408 <para>Account code for this peer.</para>
410 <enum name="useragent">
411 <para>Current user agent id for peer.</para>
413 <enum name="chanvar[name]">
414 <para>A channel variable configured with setvar for this peer.</para>
416 <enum name="codec[x]">
417 <para>Preferred codec index number <replaceable>x</replaceable> (beginning with zero).</para>
424 <function name="SIPCHANINFO" language="en_US">
426 Gets the specified SIP parameter from the current channel.
429 <parameter name="item" required="true">
432 <para>The IP address of the peer.</para>
435 <para>The source IP address of the peer.</para>
438 <para>The URI from the <literal>From:</literal> header.</para>
441 <para>The URI from the <literal>Contact:</literal> header.</para>
443 <enum name="useragent">
444 <para>The useragent.</para>
446 <enum name="peername">
447 <para>The name of the peer.</para>
449 <enum name="t38passthrough">
450 <para><literal>1</literal> if T38 is offered or enabled in this channel,
451 otherwise <literal>0</literal>.</para>
458 <function name="CHECKSIPDOMAIN" language="en_US">
460 Checks if domain is a local domain.
463 <parameter name="domain" required="true" />
466 <para>This function checks if the <replaceable>domain</replaceable> in the argument is configured
467 as a local SIP domain that this Asterisk server is configured to handle.
468 Returns the domain name if it is locally handled, otherwise an empty string.
469 Check the <literal>domain=</literal> configuration in <filename>sip.conf</filename>.</para>
472 <manager name="SIPpeers" language="en_US">
474 List SIP peers (text format).
477 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
480 <para>Lists SIP peers in text format with details on current status.
481 Peerlist will follow as separate events, followed by a final event called
482 PeerlistComplete.</para>
485 <manager name="SIPshowpeer" language="en_US">
487 show SIP peer (text format).
490 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
491 <parameter name="Peer" required="true">
492 <para>The peer name you want to check.</para>
496 <para>Show one SIP peer with details on current status.</para>
499 <manager name="SIPqualifypeer" language="en_US">
504 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
505 <parameter name="Peer" required="true">
506 <para>The peer name you want to qualify.</para>
510 <para>Qualify a SIP peer.</para>
513 <manager name="SIPshowregistry" language="en_US">
515 Show SIP registrations (text format).
518 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
521 <para>Lists all registration requests and status. Registrations will follow as separate
522 events. followed by a final event called RegistrationsComplete.</para>
525 <manager name="SIPnotify" language="en_US">
530 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
531 <parameter name="Channel" required="true">
532 <para>Peer to receive the notify.</para>
534 <parameter name="Variable" required="true">
535 <para>At least one variable pair must be specified.
536 <replaceable>name</replaceable>=<replaceable>value</replaceable></para>
540 <para>Sends a SIP Notify event.</para>
541 <para>All parameters for this event must be specified in the body of this request
542 via multiple Variable: name=value sequences.</para>
555 /* Arguments for find_peer */
556 #define FINDUSERS (1 << 0)
557 #define FINDPEERS (1 << 1)
558 #define FINDALLDEVICES (FINDUSERS | FINDPEERS)
560 #define SIPBUFSIZE 512 /*!< Buffer size for many operations */
562 #define XMIT_ERROR -2
564 #define SIP_RESERVED ";/?:@&=+$,# " /*!< Reserved characters in the username part of the URI */
566 #define DEFAULT_DEFAULT_EXPIRY 120
567 #define DEFAULT_MIN_EXPIRY 60
568 #define DEFAULT_MAX_EXPIRY 3600
569 #define DEFAULT_MWI_EXPIRY 3600
570 #define DEFAULT_REGISTRATION_TIMEOUT 20
571 #define DEFAULT_MAX_FORWARDS "70"
573 /* guard limit must be larger than guard secs */
574 /* guard min must be < 1000, and should be >= 250 */
575 #define EXPIRY_GUARD_SECS 15 /*!< How long before expiry do we reregister */
576 #define EXPIRY_GUARD_LIMIT 30 /*!< Below here, we use EXPIRY_GUARD_PCT instead of
578 #define EXPIRY_GUARD_MIN 500 /*!< This is the minimum guard time applied. If
579 GUARD_PCT turns out to be lower than this, it
580 will use this time instead.
581 This is in milliseconds. */
582 #define EXPIRY_GUARD_PCT 0.20 /*!< Percentage of expires timeout to use when
583 below EXPIRY_GUARD_LIMIT */
584 #define DEFAULT_EXPIRY 900 /*!< Expire slowly */
586 static int min_expiry = DEFAULT_MIN_EXPIRY; /*!< Minimum accepted registration time */
587 static int max_expiry = DEFAULT_MAX_EXPIRY; /*!< Maximum accepted registration time */
588 static int default_expiry = DEFAULT_DEFAULT_EXPIRY;
589 static int mwi_expiry = DEFAULT_MWI_EXPIRY;
591 #define DEFAULT_QUALIFY_GAP 100
592 #define DEFAULT_QUALIFY_PEERS 1
595 #define CALLERID_UNKNOWN "Anonymous"
596 #define FROMDOMAIN_INVALID "anonymous.invalid"
598 #define DEFAULT_MAXMS 2000 /*!< Qualification: Must be faster than 2 seconds by default */
599 #define DEFAULT_QUALIFYFREQ 60 * 1000 /*!< Qualification: How often to check for the host to be up */
600 #define DEFAULT_FREQ_NOTOK 10 * 1000 /*!< Qualification: How often to check, if the host is down... */
602 #define DEFAULT_RETRANS 1000 /*!< How frequently to retransmit Default: 2 * 500 ms in RFC 3261 */
603 #define MAX_RETRANS 6 /*!< Try only 6 times for retransmissions, a total of 7 transmissions */
604 #define DEFAULT_TIMER_T1 500 /*!< SIP timer T1 (according to RFC 3261) */
605 #define SIP_TRANS_TIMEOUT 64 * DEFAULT_TIMER_T1 /*!< SIP request timeout (rfc 3261) 64*T1
606 \todo Use known T1 for timeout (peerpoke)
608 #define DEFAULT_TRANS_TIMEOUT -1 /*!< Use default SIP transaction timeout */
609 #define PROVIS_KEEPALIVE_TIMEOUT 60000 /*!< How long to wait before retransmitting a provisional response (rfc 3261 13.3.1.1) */
610 #define MAX_AUTHTRIES 3 /*!< Try authentication three times, then fail */
612 #define SIP_MAX_HEADERS 64 /*!< Max amount of SIP headers to read */
613 #define SIP_MAX_LINES 64 /*!< Max amount of lines in SIP attachment (like SDP) */
614 #define SIP_MIN_PACKET 4096 /*!< Initialize size of memory to allocate for packets */
615 #define MAX_HISTORY_ENTRIES 50 /*!< Max entires in the history list for a sip_pvt */
617 #define INITIAL_CSEQ 101 /*!< Our initial sip sequence number */
619 #define DEFAULT_MAX_SE 1800 /*!< Session-Timer Default Session-Expires period (RFC 4028) */
620 #define DEFAULT_MIN_SE 90 /*!< Session-Timer Default Min-SE period (RFC 4028) */
622 #define SDP_MAX_RTPMAP_CODECS 32 /*!< Maximum number of codecs allowed in received SDP */
624 /*! \brief Global jitterbuffer configuration - by default, jb is disabled */
625 static struct ast_jb_conf default_jbconf =
629 .resync_threshold = -1,
632 static struct ast_jb_conf global_jbconf; /*!< Global jitterbuffer configuration */
634 static const char config[] = "sip.conf"; /*!< Main configuration file */
635 static const char notify_config[] = "sip_notify.conf"; /*!< Configuration file for sending Notify with CLI commands to reconfigure or reboot phones */
640 /*! \brief Authorization scheme for call transfers
642 \note Not a bitfield flag, since there are plans for other modes,
643 like "only allow transfers for authenticated devices" */
645 TRANSFER_OPENFORALL, /*!< Allow all SIP transfers */
646 TRANSFER_CLOSED, /*!< Allow no SIP transfers */
650 /*! \brief The result of a lot of functions */
652 AST_SUCCESS = 0, /*!< FALSE means success, funny enough */
653 AST_FAILURE = -1, /*!< Failure code */
656 /*! \brief States for the INVITE transaction, not the dialog
657 \note this is for the INVITE that sets up the dialog
660 INV_NONE = 0, /*!< No state at all, maybe not an INVITE dialog */
661 INV_CALLING = 1, /*!< Invite sent, no answer */
662 INV_PROCEEDING = 2, /*!< We got/sent 1xx message */
663 INV_EARLY_MEDIA = 3, /*!< We got 18x message with to-tag back */
664 INV_COMPLETED = 4, /*!< Got final response with error. Wait for ACK, then CONFIRMED */
665 INV_CONFIRMED = 5, /*!< Confirmed response - we've got an ack (Incoming calls only) */
666 INV_TERMINATED = 6, /*!< Transaction done - either successful (AST_STATE_UP) or failed, but done
667 The only way out of this is a BYE from one side */
668 INV_CANCELLED = 7, /*!< Transaction cancelled by client or server in non-terminated state */
671 /*! \brief Readable descriptions of device states.
672 \note Should be aligned to above table as index */
673 static const struct invstate2stringtable {
674 const enum invitestates state;
676 } invitestate2string[] = {
678 {INV_CALLING, "Calling (Trying)"},
679 {INV_PROCEEDING, "Proceeding "},
680 {INV_EARLY_MEDIA, "Early media"},
681 {INV_COMPLETED, "Completed (done)"},
682 {INV_CONFIRMED, "Confirmed (up)"},
683 {INV_TERMINATED, "Done"},
684 {INV_CANCELLED, "Cancelled"}
687 /*! \brief When sending a SIP message, we can send with a few options, depending on
688 type of SIP request. UNRELIABLE is moslty used for responses to repeated requests,
689 where the original response would be sent RELIABLE in an INVITE transaction */
691 XMIT_CRITICAL = 2, /*!< Transmit critical SIP message reliably, with re-transmits.
692 If it fails, it's critical and will cause a teardown of the session */
693 XMIT_RELIABLE = 1, /*!< Transmit SIP message reliably, with re-transmits */
694 XMIT_UNRELIABLE = 0, /*!< Transmit SIP message without bothering with re-transmits */
697 /*! \brief Results from the parse_register() function */
698 enum parse_register_result {
699 PARSE_REGISTER_FAILED,
700 PARSE_REGISTER_UPDATE,
701 PARSE_REGISTER_QUERY,
704 /*! \brief Type of subscription, based on the packages we do support, see \ref subscription_types */
705 enum subscriptiontype {
714 /*! \brief The number of media types in enum \ref media_type below. */
715 #define OFFERED_MEDIA_COUNT 4
717 /*! \brief Media types generate different "dummy answers" for not accepting the offer of
718 a media stream. We need to add definitions for each RTP profile. Secure RTP is not
719 the same as normal RTP and will require a new definition */
721 SDP_AUDIO, /*!< RTP/AVP Audio */
722 SDP_VIDEO, /*!< RTP/AVP Video */
723 SDP_IMAGE, /*!< Image udptl, not TCP or RTP */
724 SDP_TEXT, /*!< RTP/AVP Realtime Text */
727 /*! \brief Subscription types that we support. We support
728 - dialoginfo updates (really device status, not dialog info as was the original intent of the standard)
729 - SIMPLE presence used for device status
730 - Voicemail notification subscriptions
732 static const struct cfsubscription_types {
733 enum subscriptiontype type;
734 const char * const event;
735 const char * const mediatype;
736 const char * const text;
737 } subscription_types[] = {
738 { NONE, "-", "unknown", "unknown" },
739 /* RFC 4235: SIP Dialog event package */
740 { DIALOG_INFO_XML, "dialog", "application/dialog-info+xml", "dialog-info+xml" },
741 { CPIM_PIDF_XML, "presence", "application/cpim-pidf+xml", "cpim-pidf+xml" }, /* RFC 3863 */
742 { PIDF_XML, "presence", "application/pidf+xml", "pidf+xml" }, /* RFC 3863 */
743 { XPIDF_XML, "presence", "application/xpidf+xml", "xpidf+xml" }, /* Pre-RFC 3863 with MS additions */
744 { MWI_NOTIFICATION, "message-summary", "application/simple-message-summary", "mwi" } /* RFC 3842: Mailbox notification */
748 /*! \brief Authentication types - proxy or www authentication
749 \note Endpoints, like Asterisk, should always use WWW authentication to
750 allow multiple authentications in the same call - to the proxy and
758 /*! \brief Authentication result from check_auth* functions */
759 enum check_auth_result {
760 AUTH_DONT_KNOW = -100, /*!< no result, need to check further */
761 /* XXX maybe this is the same as AUTH_NOT_FOUND */
764 AUTH_CHALLENGE_SENT = 1,
765 AUTH_SECRET_FAILED = -1,
766 AUTH_USERNAME_MISMATCH = -2,
767 AUTH_NOT_FOUND = -3, /*!< returned by register_verify */
769 AUTH_UNKNOWN_DOMAIN = -5,
770 AUTH_PEER_NOT_DYNAMIC = -6,
771 AUTH_ACL_FAILED = -7,
772 AUTH_BAD_TRANSPORT = -8,
776 /*! \brief States for outbound registrations (with register= lines in sip.conf */
777 enum sipregistrystate {
778 REG_STATE_UNREGISTERED = 0, /*!< We are not registered
779 * \note Initial state. We should have a timeout scheduled for the initial
780 * (or next) registration transmission, calling sip_reregister
783 REG_STATE_REGSENT, /*!< Registration request sent
784 * \note sent initial request, waiting for an ack or a timeout to
785 * retransmit the initial request.
788 REG_STATE_AUTHSENT, /*!< We have tried to authenticate
789 * \note entered after transmit_register with auth info,
790 * waiting for an ack.
793 REG_STATE_REGISTERED, /*!< Registered and done */
795 REG_STATE_REJECTED, /*!< Registration rejected
796 * \note only used when the remote party has an expire larger than
797 * our max-expire. This is a final state from which we do not
798 * recover (not sure how correctly).
801 REG_STATE_TIMEOUT, /*!< Registration timed out
802 * \note XXX unused */
804 REG_STATE_NOAUTH, /*!< We have no accepted credentials
805 * \note fatal - no chance to proceed */
807 REG_STATE_FAILED, /*!< Registration failed after several tries
808 * \note fatal - no chance to proceed */
811 /*! \brief Modes in which Asterisk can be configured to run SIP Session-Timers */
813 SESSION_TIMER_MODE_INVALID = 0, /*!< Invalid value */
814 SESSION_TIMER_MODE_ACCEPT, /*!< Honor inbound Session-Timer requests */
815 SESSION_TIMER_MODE_ORIGINATE, /*!< Originate outbound and honor inbound requests */
816 SESSION_TIMER_MODE_REFUSE /*!< Ignore inbound Session-Timers requests */
819 /*! \brief The entity playing the refresher role for Session-Timers */
821 SESSION_TIMER_REFRESHER_AUTO, /*!< Negotiated */
822 SESSION_TIMER_REFRESHER_UAC, /*!< Session is refreshed by the UAC */
823 SESSION_TIMER_REFRESHER_UAS /*!< Session is refreshed by the UAS */
826 /*! \brief Define some implemented SIP transports
827 \note Asterisk does not support SCTP or UDP/DTLS
830 SIP_TRANSPORT_UDP = 1, /*!< Unreliable transport for SIP, needs retransmissions */
831 SIP_TRANSPORT_TCP = 1 << 1, /*!< Reliable, but unsecure */
832 SIP_TRANSPORT_TLS = 1 << 2, /*!< TCP/TLS - reliable and secure transport for signalling */
835 /*! \brief definition of a sip proxy server
837 * For outbound proxies, a sip_peer will contain a reference to a
838 * dynamically allocated instance of a sip_proxy. A sip_pvt may also
839 * contain a reference to a peer's outboundproxy, or it may contain
840 * a reference to the sip_cfg.outboundproxy.
843 char name[MAXHOSTNAMELEN]; /*!< DNS name of domain/host or IP */
844 struct sockaddr_in ip; /*!< Currently used IP address and port */
845 time_t last_dnsupdate; /*!< When this was resolved */
846 enum sip_transport transport;
847 int force; /*!< If it's an outbound proxy, Force use of this outbound proxy for all outbound requests */
848 /* Room for a SRV record chain based on the name */
851 /*! \brief argument for the 'show channels|subscriptions' callback. */
852 struct __show_chan_arg {
855 int numchans; /* return value */
859 /*! \brief States whether a SIP message can create a dialog in Asterisk. */
860 enum can_create_dialog {
861 CAN_NOT_CREATE_DIALOG,
863 CAN_CREATE_DIALOG_UNSUPPORTED_METHOD,
866 /*! \brief SIP Request methods known by Asterisk
868 \note Do _NOT_ make any changes to this enum, or the array following it;
869 if you think you are doing the right thing, you are probably
870 not doing the right thing. If you think there are changes
871 needed, get someone else to review them first _before_
872 submitting a patch. If these two lists do not match properly
873 bad things will happen.
877 SIP_UNKNOWN, /*!< Unknown response */
878 SIP_RESPONSE, /*!< Not request, response to outbound request */
879 SIP_REGISTER, /*!< Registration to the mothership, tell us where you are located */
880 SIP_OPTIONS, /*!< Check capabilities of a device, used for "ping" too */
881 SIP_NOTIFY, /*!< Status update, Part of the event package standard, result of a SUBSCRIBE or a REFER */
882 SIP_INVITE, /*!< Set up a session */
883 SIP_ACK, /*!< End of a three-way handshake started with INVITE. */
884 SIP_PRACK, /*!< Reliable pre-call signalling. Not supported in Asterisk. */
885 SIP_BYE, /*!< End of a session */
886 SIP_REFER, /*!< Refer to another URI (transfer) */
887 SIP_SUBSCRIBE, /*!< Subscribe for updates (voicemail, session status, device status, presence) */
888 SIP_MESSAGE, /*!< Text messaging */
889 SIP_UPDATE, /*!< Update a dialog. We can send UPDATE; but not accept it */
890 SIP_INFO, /*!< Information updates during a session */
891 SIP_CANCEL, /*!< Cancel an INVITE */
892 SIP_PUBLISH, /*!< Not supported in Asterisk */
893 SIP_PING, /*!< Not supported at all, no standard but still implemented out there */
896 /*! \brief Settings for the 'notifycid' option, see sip.conf.sample for details. */
897 enum notifycid_setting {
903 /*! \brief The core structure to setup dialogs. We parse incoming messages by using
904 structure and then route the messages according to the type.
906 \note Note that sip_methods[i].id == i must hold or the code breaks */
907 static const struct cfsip_methods {
909 int need_rtp; /*!< when this is the 'primary' use for a pvt structure, does it need RTP? */
911 enum can_create_dialog can_create;
913 { SIP_UNKNOWN, RTP, "-UNKNOWN-", CAN_CREATE_DIALOG },
914 { SIP_RESPONSE, NO_RTP, "SIP/2.0", CAN_NOT_CREATE_DIALOG },
915 { SIP_REGISTER, NO_RTP, "REGISTER", CAN_CREATE_DIALOG },
916 { SIP_OPTIONS, NO_RTP, "OPTIONS", CAN_CREATE_DIALOG },
917 { SIP_NOTIFY, NO_RTP, "NOTIFY", CAN_CREATE_DIALOG },
918 { SIP_INVITE, RTP, "INVITE", CAN_CREATE_DIALOG },
919 { SIP_ACK, NO_RTP, "ACK", CAN_NOT_CREATE_DIALOG },
920 { SIP_PRACK, NO_RTP, "PRACK", CAN_NOT_CREATE_DIALOG },
921 { SIP_BYE, NO_RTP, "BYE", CAN_NOT_CREATE_DIALOG },
922 { SIP_REFER, NO_RTP, "REFER", CAN_CREATE_DIALOG },
923 { SIP_SUBSCRIBE, NO_RTP, "SUBSCRIBE", CAN_CREATE_DIALOG },
924 { SIP_MESSAGE, NO_RTP, "MESSAGE", CAN_CREATE_DIALOG },
925 { SIP_UPDATE, NO_RTP, "UPDATE", CAN_NOT_CREATE_DIALOG },
926 { SIP_INFO, NO_RTP, "INFO", CAN_NOT_CREATE_DIALOG },
927 { SIP_CANCEL, NO_RTP, "CANCEL", CAN_NOT_CREATE_DIALOG },
928 { SIP_PUBLISH, NO_RTP, "PUBLISH", CAN_CREATE_DIALOG_UNSUPPORTED_METHOD },
929 { SIP_PING, NO_RTP, "PING", CAN_CREATE_DIALOG_UNSUPPORTED_METHOD }
932 /*! Define SIP option tags, used in Require: and Supported: headers
933 We need to be aware of these properties in the phones to use
934 the replace: header. We should not do that without knowing
935 that the other end supports it...
936 This is nothing we can configure, we learn by the dialog
937 Supported: header on the REGISTER (peer) or the INVITE
939 We are not using many of these today, but will in the future.
940 This is documented in RFC 3261
943 #define NOT_SUPPORTED 0
946 #define SIP_OPT_REPLACES (1 << 0)
947 #define SIP_OPT_100REL (1 << 1)
948 #define SIP_OPT_TIMER (1 << 2)
949 #define SIP_OPT_EARLY_SESSION (1 << 3)
950 #define SIP_OPT_JOIN (1 << 4)
951 #define SIP_OPT_PATH (1 << 5)
952 #define SIP_OPT_PREF (1 << 6)
953 #define SIP_OPT_PRECONDITION (1 << 7)
954 #define SIP_OPT_PRIVACY (1 << 8)
955 #define SIP_OPT_SDP_ANAT (1 << 9)
956 #define SIP_OPT_SEC_AGREE (1 << 10)
957 #define SIP_OPT_EVENTLIST (1 << 11)
958 #define SIP_OPT_GRUU (1 << 12)
959 #define SIP_OPT_TARGET_DIALOG (1 << 13)
960 #define SIP_OPT_NOREFERSUB (1 << 14)
961 #define SIP_OPT_HISTINFO (1 << 15)
962 #define SIP_OPT_RESPRIORITY (1 << 16)
963 #define SIP_OPT_FROMCHANGE (1 << 17)
964 #define SIP_OPT_RECLISTINV (1 << 18)
965 #define SIP_OPT_RECLISTSUB (1 << 19)
966 #define SIP_OPT_OUTBOUND (1 << 20)
967 #define SIP_OPT_UNKNOWN (1 << 21)
970 /*! \brief List of well-known SIP options. If we get this in a require,
971 we should check the list and answer accordingly. */
972 static const struct cfsip_options {
973 int id; /*!< Bitmap ID */
974 int supported; /*!< Supported by Asterisk ? */
975 char * const text; /*!< Text id, as in standard */
976 } sip_options[] = { /* XXX used in 3 places */
977 /* RFC3262: PRACK 100% reliability */
978 { SIP_OPT_100REL, NOT_SUPPORTED, "100rel" },
979 /* RFC3959: SIP Early session support */
980 { SIP_OPT_EARLY_SESSION, NOT_SUPPORTED, "early-session" },
981 /* SIMPLE events: RFC4662 */
982 { SIP_OPT_EVENTLIST, NOT_SUPPORTED, "eventlist" },
983 /* RFC 4916- Connected line ID updates */
984 { SIP_OPT_FROMCHANGE, NOT_SUPPORTED, "from-change" },
985 /* GRUU: Globally Routable User Agent URI's */
986 { SIP_OPT_GRUU, NOT_SUPPORTED, "gruu" },
987 /* RFC4244 History info */
988 { SIP_OPT_HISTINFO, NOT_SUPPORTED, "histinfo" },
989 /* RFC3911: SIP Join header support */
990 { SIP_OPT_JOIN, NOT_SUPPORTED, "join" },
991 /* Disable the REFER subscription, RFC 4488 */
992 { SIP_OPT_NOREFERSUB, NOT_SUPPORTED, "norefersub" },
993 /* SIP outbound - the final NAT battle - draft-sip-outbound */
994 { SIP_OPT_OUTBOUND, NOT_SUPPORTED, "outbound" },
995 /* RFC3327: Path support */
996 { SIP_OPT_PATH, NOT_SUPPORTED, "path" },
997 /* RFC3840: Callee preferences */
998 { SIP_OPT_PREF, NOT_SUPPORTED, "pref" },
999 /* RFC3312: Precondition support */
1000 { SIP_OPT_PRECONDITION, NOT_SUPPORTED, "precondition" },
1001 /* RFC3323: Privacy with proxies*/
1002 { SIP_OPT_PRIVACY, NOT_SUPPORTED, "privacy" },
1003 /* RFC-ietf-sip-uri-list-conferencing-02.txt conference invite lists */
1004 { SIP_OPT_RECLISTINV, NOT_SUPPORTED, "recipient-list-invite" },
1005 /* RFC-ietf-sip-uri-list-subscribe-02.txt - subscription lists */
1006 { SIP_OPT_RECLISTSUB, NOT_SUPPORTED, "recipient-list-subscribe" },
1007 /* RFC3891: Replaces: header for transfer */
1008 { SIP_OPT_REPLACES, SUPPORTED, "replaces" },
1009 /* One version of Polycom firmware has the wrong label */
1010 { SIP_OPT_REPLACES, SUPPORTED, "replace" },
1011 /* RFC4412 Resource priorities */
1012 { SIP_OPT_RESPRIORITY, NOT_SUPPORTED, "resource-priority" },
1013 /* RFC3329: Security agreement mechanism */
1014 { SIP_OPT_SEC_AGREE, NOT_SUPPORTED, "sec_agree" },
1015 /* RFC4092: Usage of the SDP ANAT Semantics in the SIP */
1016 { SIP_OPT_SDP_ANAT, NOT_SUPPORTED, "sdp-anat" },
1017 /* RFC4028: SIP Session-Timers */
1018 { SIP_OPT_TIMER, SUPPORTED, "timer" },
1019 /* RFC4538: Target-dialog */
1020 { SIP_OPT_TARGET_DIALOG,NOT_SUPPORTED, "tdialog" },
1023 /*! \brief Diversion header reasons
1025 * The core defines a bunch of constants used to define
1026 * redirecting reasons. This provides a translation table
1027 * between those and the strings which may be present in
1028 * a SIP Diversion header
1030 static const struct sip_reasons {
1031 enum AST_REDIRECTING_REASON code;
1033 } sip_reason_table[] = {
1034 { AST_REDIRECTING_REASON_UNKNOWN, "unknown" },
1035 { AST_REDIRECTING_REASON_USER_BUSY, "user-busy" },
1036 { AST_REDIRECTING_REASON_NO_ANSWER, "no-answer" },
1037 { AST_REDIRECTING_REASON_UNAVAILABLE, "unavailable" },
1038 { AST_REDIRECTING_REASON_UNCONDITIONAL, "unconditional" },
1039 { AST_REDIRECTING_REASON_TIME_OF_DAY, "time-of-day" },
1040 { AST_REDIRECTING_REASON_DO_NOT_DISTURB, "do-not-disturb" },
1041 { AST_REDIRECTING_REASON_DEFLECTION, "deflection" },
1042 { AST_REDIRECTING_REASON_FOLLOW_ME, "follow-me" },
1043 { AST_REDIRECTING_REASON_OUT_OF_ORDER, "out-of-service" },
1044 { AST_REDIRECTING_REASON_AWAY, "away" },
1045 { AST_REDIRECTING_REASON_CALL_FWD_DTE, "unknown"}
1048 static enum AST_REDIRECTING_REASON sip_reason_str_to_code(const char *text)
1050 enum AST_REDIRECTING_REASON ast = AST_REDIRECTING_REASON_UNKNOWN;
1053 for (i = 0; i < ARRAY_LEN(sip_reason_table); ++i) {
1054 if (!strcasecmp(text, sip_reason_table[i].text)) {
1055 ast = sip_reason_table[i].code;
1063 static const char *sip_reason_code_to_str(enum AST_REDIRECTING_REASON code)
1065 if (code >= 0 && code < ARRAY_LEN(sip_reason_table)) {
1066 return sip_reason_table[code].text;
1072 /*! \brief SIP Methods we support
1073 \todo This string should be set dynamically. We only support REFER and SUBSCRIBE if we have
1074 allowsubscribe and allowrefer on in sip.conf.
1076 #define ALLOWED_METHODS "INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO"
1078 /*! \brief SIP Extensions we support
1079 \note This should be generated based on the previous array
1080 in combination with settings.
1081 \todo We should not have "timer" if it's disabled in the configuration file.
1083 #define SUPPORTED_EXTENSIONS "replaces, timer"
1085 /*! \brief Standard SIP unsecure port for UDP and TCP from RFC 3261. DO NOT CHANGE THIS */
1086 #define STANDARD_SIP_PORT 5060
1087 /*! \brief Standard SIP TLS port from RFC 3261. DO NOT CHANGE THIS */
1088 #define STANDARD_TLS_PORT 5061
1090 /*! \note in many SIP headers, absence of a port number implies port 5060,
1091 * and this is why we cannot change the above constant.
1092 * There is a limited number of places in asterisk where we could,
1093 * in principle, use a different "default" port number, but
1094 * we do not support this feature at the moment.
1095 * You can run Asterisk with SIP on a different port with a configuration
1096 * option. If you change this value in the source code, the signalling will be incorrect.
1100 /*! \name DefaultValues Default values, set and reset in reload_config before reading configuration
1102 These are default values in the source. There are other recommended values in the
1103 sip.conf.sample for new installations. These may differ to keep backwards compatibility,
1104 yet encouraging new behaviour on new installations
1107 #define DEFAULT_CONTEXT "default" /*!< The default context for [general] section as well as devices */
1108 #define DEFAULT_MOHINTERPRET "default" /*!< The default music class */
1109 #define DEFAULT_MOHSUGGEST ""
1110 #define DEFAULT_VMEXTEN "asterisk" /*!< Default voicemail extension */
1111 #define DEFAULT_CALLERID "asterisk" /*!< Default caller ID */
1112 #define DEFAULT_MWI_FROM ""
1113 #define DEFAULT_NOTIFYMIME "application/simple-message-summary"
1114 #define DEFAULT_ALLOWGUEST TRUE
1115 #define DEFAULT_RTPKEEPALIVE 0 /*!< Default RTPkeepalive setting */
1116 #define DEFAULT_CALLCOUNTER FALSE /*!< Do not enable call counters by default */
1117 #define DEFAULT_SRVLOOKUP TRUE /*!< Recommended setting is ON */
1118 #define DEFAULT_COMPACTHEADERS FALSE /*!< Send compact (one-character) SIP headers. Default off */
1119 #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. */
1120 #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. */
1121 #define DEFAULT_TOS_VIDEO 0 /*!< Video packets should be marked as DSCP AF41, but the default is 0 to be compatible with previous versions. */
1122 #define DEFAULT_TOS_TEXT 0 /*!< Text packets should be marked as XXXX XXXX, but the default is 0 to be compatible with previous versions. */
1123 #define DEFAULT_COS_SIP 4 /*!< Level 2 class of service for SIP signalling */
1124 #define DEFAULT_COS_AUDIO 5 /*!< Level 2 class of service for audio media */
1125 #define DEFAULT_COS_VIDEO 6 /*!< Level 2 class of service for video media */
1126 #define DEFAULT_COS_TEXT 5 /*!< Level 2 class of service for text media (T.140) */
1127 #define DEFAULT_ALLOW_EXT_DOM TRUE /*!< Allow external domains */
1128 #define DEFAULT_REALM "asterisk" /*!< Realm for HTTP digest authentication */
1129 #define DEFAULT_DOMAINSASREALM FALSE /*!< Use the domain option to guess the realm for registration and invite requests */
1130 #define DEFAULT_NOTIFYRINGING TRUE /*!< Notify devicestate system on ringing state */
1131 #define DEFAULT_NOTIFYCID DISABLED /*!< Include CID with ringing notifications */
1132 #define DEFAULT_PEDANTIC FALSE /*!< Avoid following SIP standards for dialog matching */
1133 #define DEFAULT_AUTOCREATEPEER FALSE /*!< Don't create peers automagically */
1134 #define DEFAULT_MATCHEXTERNIPLOCALLY FALSE /*!< Match extern IP locally default setting */
1135 #define DEFAULT_QUALIFY FALSE /*!< Don't monitor devices */
1136 #define DEFAULT_CALLEVENTS FALSE /*!< Extra manager SIP call events */
1137 #define DEFAULT_ALWAYSAUTHREJECT FALSE /*!< Don't reject authentication requests always */
1138 #define DEFAULT_REGEXTENONQUALIFY FALSE
1139 #define DEFAULT_T1MIN 100 /*!< 100 MS for minimal roundtrip time */
1140 #define DEFAULT_MAX_CALL_BITRATE (384) /*!< Max bitrate for video */
1141 #ifndef DEFAULT_USERAGENT
1142 #define DEFAULT_USERAGENT "Asterisk PBX" /*!< Default Useragent: header unless re-defined in sip.conf */
1143 #define DEFAULT_SDPSESSION "Asterisk PBX" /*!< Default SDP session name, (s=) header unless re-defined in sip.conf */
1144 #define DEFAULT_SDPOWNER "root" /*!< Default SDP username field in (o=) header unless re-defined in sip.conf */
1145 #define DEFAULT_ENGINE "asterisk" /*!< Default RTP engine to use for sessions */
1146 #define DEFAULT_CAPABILITY (AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_GSM | AST_FORMAT_H263);
1150 /*! \name DefaultSettings
1151 Default setttings are used as a channel setting and as a default when
1155 static char default_language[MAX_LANGUAGE]; /*!< Default language setting for new channels */
1156 static char default_callerid[AST_MAX_EXTENSION]; /*!< Default caller ID for sip messages */
1157 static char default_mwi_from[80]; /*!< Default caller ID for MWI updates */
1158 static char default_fromdomain[AST_MAX_EXTENSION]; /*!< Default domain on outound messages */
1159 static char default_notifymime[AST_MAX_EXTENSION]; /*!< Default MIME media type for MWI notify messages */
1160 static char default_vmexten[AST_MAX_EXTENSION]; /*!< Default From Username on MWI updates */
1161 static int default_qualify; /*!< Default Qualify= setting */
1162 static char default_mohinterpret[MAX_MUSICCLASS]; /*!< Global setting for moh class to use when put on hold */
1163 static char default_mohsuggest[MAX_MUSICCLASS]; /*!< Global setting for moh class to suggest when putting
1164 * a bridged channel on hold */
1165 static char default_parkinglot[AST_MAX_CONTEXT]; /*!< Parkinglot */
1166 static char default_engine[256]; /*!< Default RTP engine */
1167 static int default_maxcallbitrate; /*!< Maximum bitrate for call */
1168 static struct ast_codec_pref default_prefs; /*!< Default codec prefs */
1169 static unsigned int default_transports; /*!< Default Transports (enum sip_transport) that are acceptable */
1170 static unsigned int default_primary_transport; /*!< Default primary Transport (enum sip_transport) for outbound connections to devices */
1174 /*! \name GlobalSettings
1175 Global settings apply to the channel (often settings you can change in the general section
1179 /*! \brief a place to store all global settings for the sip channel driver
1181 These are settings that will be possibly to apply on a group level later on.
1182 \note Do not add settings that only apply to the channel itself and can't
1183 be applied to devices (trunks, services, phones)
1185 struct sip_settings {
1186 int peer_rtupdate; /*!< G: Update database with registration data for peer? */
1187 int rtsave_sysname; /*!< G: Save system name at registration? */
1188 int ignore_regexpire; /*!< G: Ignore expiration of peer */
1189 int rtautoclear; /*!< Realtime ?? */
1190 int directrtpsetup; /*!< Enable support for Direct RTP setup (no re-invites) */
1191 int pedanticsipchecking; /*!< Extra checking ? Default off */
1192 int autocreatepeer; /*!< Auto creation of peers at registration? Default off. */
1193 int srvlookup; /*!< SRV Lookup on or off. Default is on */
1194 int allowguest; /*!< allow unauthenticated peers to connect? */
1195 int alwaysauthreject; /*!< Send 401 Unauthorized for all failing requests */
1196 int compactheaders; /*!< send compact sip headers */
1197 int allow_external_domains; /*!< Accept calls to external SIP domains? */
1198 int callevents; /*!< Whether we send manager events or not */
1199 int regextenonqualify; /*!< Whether to add/remove regexten when qualifying peers */
1200 int matchexterniplocally; /*!< Match externip/externhost setting against localnet setting */
1201 char regcontext[AST_MAX_CONTEXT]; /*!< Context for auto-extensions */
1202 unsigned int disallowed_methods; /*!< methods that we should never try to use */
1203 int notifyringing; /*!< Send notifications on ringing */
1204 int notifyhold; /*!< Send notifications on hold */
1205 enum notifycid_setting notifycid; /*!< Send CID with ringing notifications */
1206 enum transfermodes allowtransfer; /*!< SIP Refer restriction scheme */
1207 int allowsubscribe; /*!< Flag for disabling ALL subscriptions, this is FALSE only if all peers are FALSE
1208 the global setting is in globals_flags[1] */
1209 char realm[MAXHOSTNAMELEN]; /*!< Default realm */
1210 int domainsasrealm; /*!< Use domains lists as realms */
1211 struct sip_proxy outboundproxy; /*!< Outbound proxy */
1212 char default_context[AST_MAX_CONTEXT];
1213 char default_subscribecontext[AST_MAX_CONTEXT];
1214 struct ast_ha *contact_ha; /*! \brief Global list of addresses dynamic peers are not allowed to use */
1215 int capability; /*!< Supported codecs */
1218 static struct sip_settings sip_cfg; /*!< SIP configuration data.
1219 \note in the future we could have multiple of these (per domain, per device group etc) */
1221 static int global_match_auth_username; /*!< Match auth username if available instead of From: Default off. */
1223 static int global_relaxdtmf; /*!< Relax DTMF */
1224 static int global_prematuremediafilter; /*!< Enable/disable premature frames in a call (causing 183 early media) */
1225 static int global_rtptimeout; /*!< Time out call if no RTP */
1226 static int global_rtpholdtimeout; /*!< Time out call if no RTP during hold */
1227 static int global_rtpkeepalive; /*!< Send RTP keepalives */
1228 static int global_reg_timeout; /*!< Global time between attempts for outbound registrations */
1229 static int global_regattempts_max; /*!< Registration attempts before giving up */
1230 static int global_callcounter; /*!< Enable call counters for all devices. This is currently enabled by setting the peer
1231 call-limit to UINT_MAX. When we remove the call-limit from the code, we can make it
1232 with just a boolean flag in the device structure */
1233 static unsigned int global_tos_sip; /*!< IP type of service for SIP packets */
1234 static unsigned int global_tos_audio; /*!< IP type of service for audio RTP packets */
1235 static unsigned int global_tos_video; /*!< IP type of service for video RTP packets */
1236 static unsigned int global_tos_text; /*!< IP type of service for text RTP packets */
1237 static unsigned int global_cos_sip; /*!< 802.1p class of service for SIP packets */
1238 static unsigned int global_cos_audio; /*!< 802.1p class of service for audio RTP packets */
1239 static unsigned int global_cos_video; /*!< 802.1p class of service for video RTP packets */
1240 static unsigned int global_cos_text; /*!< 802.1p class of service for text RTP packets */
1241 static unsigned int recordhistory; /*!< Record SIP history. Off by default */
1242 static unsigned int dumphistory; /*!< Dump history to verbose before destroying SIP dialog */
1243 static char global_useragent[AST_MAX_EXTENSION]; /*!< Useragent for the SIP channel */
1244 static char global_sdpsession[AST_MAX_EXTENSION]; /*!< SDP session name for the SIP channel */
1245 static char global_sdpowner[AST_MAX_EXTENSION]; /*!< SDP owner name for the SIP channel */
1246 static int global_authfailureevents; /*!< Whether we send authentication failure manager events or not. Default no. */
1247 static int global_t1; /*!< T1 time */
1248 static int global_t1min; /*!< T1 roundtrip time minimum */
1249 static int global_timer_b; /*!< Timer B - RFC 3261 Section 17.1.1.2 */
1250 static unsigned int global_autoframing; /*!< Turn autoframing on or off. */
1251 static int global_qualifyfreq; /*!< Qualify frequency */
1252 static int global_qualify_gap; /*!< Time between our group of peer pokes */
1253 static int global_qualify_peers; /*!< Number of peers to poke at a given time */
1256 static enum st_mode global_st_mode; /*!< Mode of operation for Session-Timers */
1257 static enum st_refresher global_st_refresher; /*!< Session-Timer refresher */
1258 static int global_min_se; /*!< Lowest threshold for session refresh interval */
1259 static int global_max_se; /*!< Highest threshold for session refresh interval */
1261 static int global_dynamic_exclude_static = 0; /*!< Exclude static peers from contact registrations */
1265 /*! \name Object counters @{
1266 * \bug These counters are not handled in a thread-safe way ast_atomic_fetchadd_int()
1267 * should be used to modify these values. */
1268 static int speerobjs = 0; /*!< Static peers */
1269 static int rpeerobjs = 0; /*!< Realtime peers */
1270 static int apeerobjs = 0; /*!< Autocreated peer objects */
1271 static int regobjs = 0; /*!< Registry objects */
1274 static struct ast_flags global_flags[2] = {{0}}; /*!< global SIP_ flags */
1275 static char used_context[AST_MAX_CONTEXT]; /*!< name of automatically created context for unloading */
1278 AST_MUTEX_DEFINE_STATIC(netlock);
1280 /*! \brief Protect the monitoring thread, so only one process can kill or start it, and not
1281 when it's doing something critical. */
1282 AST_MUTEX_DEFINE_STATIC(monlock);
1284 AST_MUTEX_DEFINE_STATIC(sip_reload_lock);
1286 /*! \brief This is the thread for the monitor which checks for input on the channels
1287 which are not currently in use. */
1288 static pthread_t monitor_thread = AST_PTHREADT_NULL;
1290 static int sip_reloading = FALSE; /*!< Flag for avoiding multiple reloads at the same time */
1291 static enum channelreloadreason sip_reloadreason; /*!< Reason for last reload/load of configuration */
1293 static struct sched_context *sched; /*!< The scheduling context */
1294 static struct io_context *io; /*!< The IO context */
1295 static int *sipsock_read_id; /*!< ID of IO entry for sipsock FD */
1297 #define DEC_CALL_LIMIT 0
1298 #define INC_CALL_LIMIT 1
1299 #define DEC_CALL_RINGING 2
1300 #define INC_CALL_RINGING 3
1302 /*! \brief The SIP socket definition */
1304 enum sip_transport type; /*!< UDP, TCP or TLS */
1305 int fd; /*!< Filed descriptor, the actual socket */
1307 struct ast_tcptls_session_instance *tcptls_session; /* If tcp or tls, a socket manager */
1310 /*! \brief sip_request: The data grabbed from the UDP socket
1313 * Incoming messages: we first store the data from the socket in data[],
1314 * adding a trailing \0 to make string parsing routines happy.
1315 * Then call parse_request() and req.method = find_sip_method();
1316 * to initialize the other fields. The \r\n at the end of each line is
1317 * replaced by \0, so that data[] is not a conforming SIP message anymore.
1318 * After this processing, rlPart1 is set to non-NULL to remember
1319 * that we can run get_header() on this kind of packet.
1321 * parse_request() splits the first line as follows:
1322 * Requests have in the first line method uri SIP/2.0
1323 * rlPart1 = method; rlPart2 = uri;
1324 * Responses have in the first line SIP/2.0 NNN description
1325 * rlPart1 = SIP/2.0; rlPart2 = NNN + description;
1327 * For outgoing packets, we initialize the fields with init_req() or init_resp()
1328 * (which fills the first line to "METHOD uri SIP/2.0" or "SIP/2.0 code text"),
1329 * and then fill the rest with add_header() and add_line().
1330 * The \r\n at the end of the line are still there, so the get_header()
1331 * and similar functions don't work on these packets.
1334 struct sip_request {
1335 ptrdiff_t rlPart1; /*!< Offset of the SIP Method Name or "SIP/2.0" protocol version */
1336 ptrdiff_t rlPart2; /*!< Offset of the Request URI or Response Status */
1337 int len; /*!< bytes used in data[], excluding trailing null terminator. Rarely used. */
1338 int headers; /*!< # of SIP Headers */
1339 int method; /*!< Method of this request */
1340 int lines; /*!< Body Content */
1341 unsigned int sdp_start; /*!< the line number where the SDP begins */
1342 unsigned int sdp_end; /*!< the line number where the SDP ends */
1343 char debug; /*!< print extra debugging if non zero */
1344 char has_to_tag; /*!< non-zero if packet has To: tag */
1345 char ignore; /*!< if non-zero This is a re-transmit, ignore it */
1346 ptrdiff_t header[SIP_MAX_HEADERS]; /*!< Array of offsets into the request string of each SIP header*/
1347 ptrdiff_t line[SIP_MAX_LINES]; /*!< Array of offsets into the request string of each SDP line*/
1348 struct ast_str *data;
1349 /* XXX Do we need to unref socket.ser when the request goes away? */
1350 struct sip_socket socket; /*!< The socket used for this request */
1351 AST_LIST_ENTRY(sip_request) next;
1354 /* \brief given a sip_request and an offset, return the char * that resides there
1356 * It used to be that rlPart1, rlPart2, and the header and line arrays were character
1357 * pointers. They are now offsets into the ast_str portion of the sip_request structure.
1358 * To avoid adding a bunch of redundant pointer arithmetic to the code, this macro is
1359 * provided to retrieve the string at a particular offset within the request's buffer
1361 #define REQ_OFFSET_TO_STR(req,offset) (ast_str_buffer((req)->data) + ((req)->offset))
1363 /*! \brief structure used in transfers */
1365 struct ast_channel *chan1; /*!< First channel involved */
1366 struct ast_channel *chan2; /*!< Second channel involved */
1367 struct sip_request req; /*!< Request that caused the transfer (REFER) */
1368 int seqno; /*!< Sequence number */
1373 /*! \brief Parameters to the transmit_invite function */
1374 struct sip_invite_param {
1375 int addsipheaders; /*!< Add extra SIP headers */
1376 const char *uri_options; /*!< URI options to add to the URI */
1377 const char *vxml_url; /*!< VXML url for Cisco phones */
1378 char *auth; /*!< Authentication */
1379 char *authheader; /*!< Auth header */
1380 enum sip_auth_type auth_type; /*!< Authentication type */
1381 const char *replaces; /*!< Replaces header for call transfers */
1382 int transfer; /*!< Flag - is this Invite part of a SIP transfer? (invite/replaces) */
1385 /*! \brief Structure to save routing information for a SIP session */
1387 struct sip_route *next;
1391 /*! \brief Modes for SIP domain handling in the PBX */
1393 SIP_DOMAIN_AUTO, /*!< This domain is auto-configured */
1394 SIP_DOMAIN_CONFIG, /*!< This domain is from configuration */
1397 /*! \brief Domain data structure.
1398 \note In the future, we will connect this to a configuration tree specific
1402 char domain[MAXHOSTNAMELEN]; /*!< SIP domain we are responsible for */
1403 char context[AST_MAX_EXTENSION]; /*!< Incoming context for this domain */
1404 enum domain_mode mode; /*!< How did we find this domain? */
1405 AST_LIST_ENTRY(domain) list; /*!< List mechanics */
1408 static AST_LIST_HEAD_STATIC(domain_list, domain); /*!< The SIP domain list */
1411 /*! \brief sip_history: Structure for saving transactions within a SIP dialog */
1412 struct sip_history {
1413 AST_LIST_ENTRY(sip_history) list;
1414 char event[0]; /* actually more, depending on needs */
1417 AST_LIST_HEAD_NOLOCK(sip_history_head, sip_history); /*!< history list, entry in sip_pvt */
1419 /*! \brief sip_auth: Credentials for authentication to other SIP services */
1421 char realm[AST_MAX_EXTENSION]; /*!< Realm in which these credentials are valid */
1422 char username[256]; /*!< Username */
1423 char secret[256]; /*!< Secret */
1424 char md5secret[256]; /*!< MD5Secret */
1425 struct sip_auth *next; /*!< Next auth structure in list */
1429 Various flags for the flags field in the pvt structure
1430 Trying to sort these up (one or more of the following):
1434 When flags are used by multiple structures, it is important that
1435 they have a common layout so it is easy to copy them.
1438 #define SIP_OUTGOING (1 << 0) /*!< D: Direction of the last transaction in this dialog */
1439 #define SIP_RINGING (1 << 2) /*!< D: Have sent 180 ringing */
1440 #define SIP_PROGRESS_SENT (1 << 3) /*!< D: Have sent 183 message progress */
1441 #define SIP_NEEDREINVITE (1 << 4) /*!< D: Do we need to send another reinvite? */
1442 #define SIP_PENDINGBYE (1 << 5) /*!< D: Need to send bye after we ack? */
1443 #define SIP_GOTREFER (1 << 6) /*!< D: Got a refer? */
1444 #define SIP_CALL_LIMIT (1 << 7) /*!< D: Call limit enforced for this call */
1445 #define SIP_INC_COUNT (1 << 8) /*!< D: Did this dialog increment the counter of in-use calls? */
1446 #define SIP_INC_RINGING (1 << 9) /*!< D: Did this connection increment the counter of in-use calls? */
1447 #define SIP_DEFER_BYE_ON_TRANSFER (1 << 10) /*!< D: Do not hangup at first ast_hangup */
1449 #define SIP_PROMISCREDIR (1 << 11) /*!< DP: Promiscuous redirection */
1450 #define SIP_TRUSTRPID (1 << 12) /*!< DP: Trust RPID headers? */
1451 #define SIP_USEREQPHONE (1 << 13) /*!< DP: Add user=phone to numeric URI. Default off */
1452 #define SIP_USECLIENTCODE (1 << 14) /*!< DP: Trust X-ClientCode info message */
1454 /* DTMF flags - see str2dtmfmode() and dtmfmode2str() */
1455 #define SIP_DTMF (7 << 15) /*!< DP: DTMF Support: five settings, uses three bits */
1456 #define SIP_DTMF_RFC2833 (0 << 15) /*!< DP: DTMF Support: RTP DTMF - "rfc2833" */
1457 #define SIP_DTMF_INBAND (1 << 15) /*!< DP: DTMF Support: Inband audio, only for ULAW/ALAW - "inband" */
1458 #define SIP_DTMF_INFO (2 << 15) /*!< DP: DTMF Support: SIP Info messages - "info" */
1459 #define SIP_DTMF_AUTO (3 << 15) /*!< DP: DTMF Support: AUTO switch between rfc2833 and in-band DTMF */
1460 #define SIP_DTMF_SHORTINFO (4 << 15) /*!< DP: DTMF Support: SIP Info messages - "info" - short variant */
1463 #define SIP_NAT_FORCE_RPORT (1 << 18) /*!< DP: Force rport even if not present in the request */
1464 #define SIP_NAT_RPORT_PRESENT (1 << 19) /*!< DP: rport was present in the request */
1466 /* re-INVITE related settings */
1467 #define SIP_REINVITE (7 << 20) /*!< DP: four settings, uses three bits */
1468 #define SIP_REINVITE_NONE (0 << 20) /*!< DP: no reinvite allowed */
1469 #define SIP_DIRECT_MEDIA (1 << 20) /*!< DP: allow peers to be reinvited to send media directly p2p */
1470 #define SIP_DIRECT_MEDIA_NAT (2 << 20) /*!< DP: allow media reinvite when new peer is behind NAT */
1471 #define SIP_REINVITE_UPDATE (4 << 20) /*!< DP: use UPDATE (RFC3311) when reinviting this peer */
1473 /* "insecure" settings - see insecure2str() */
1474 #define SIP_INSECURE (3 << 23) /*!< DP: three settings, uses two bits */
1475 #define SIP_INSECURE_NONE (0 << 23) /*!< DP: secure mode */
1476 #define SIP_INSECURE_PORT (1 << 23) /*!< DP: don't require matching port for incoming requests */
1477 #define SIP_INSECURE_INVITE (1 << 24) /*!< DP: don't require authentication for incoming INVITEs */
1479 /* Sending PROGRESS in-band settings */
1480 #define SIP_PROG_INBAND (3 << 25) /*!< DP: three settings, uses two bits */
1481 #define SIP_PROG_INBAND_NEVER (0 << 25)
1482 #define SIP_PROG_INBAND_NO (1 << 25)
1483 #define SIP_PROG_INBAND_YES (2 << 25)
1485 #define SIP_SENDRPID (3 << 29) /*!< DP: Remote Party-ID Support */
1486 #define SIP_SENDRPID_NO (0 << 29)
1487 #define SIP_SENDRPID_PAI (1 << 29) /*!< Use "P-Asserted-Identity" for rpid */
1488 #define SIP_SENDRPID_RPID (2 << 29) /*!< Use "Remote-Party-ID" for rpid */
1489 #define SIP_G726_NONSTANDARD (1 << 31) /*!< DP: Use non-standard packing for G726-32 data */
1491 /*! \brief Flags to copy from peer/user to dialog */
1492 #define SIP_FLAGS_TO_COPY \
1493 (SIP_PROMISCREDIR | SIP_TRUSTRPID | SIP_SENDRPID | SIP_DTMF | SIP_REINVITE | \
1494 SIP_PROG_INBAND | SIP_USECLIENTCODE | SIP_NAT_FORCE_RPORT | SIP_G726_NONSTANDARD | \
1495 SIP_USEREQPHONE | SIP_INSECURE)
1499 a second page of flags (for flags[1] */
1501 /* realtime flags */
1502 #define SIP_PAGE2_RTCACHEFRIENDS (1 << 0) /*!< GP: Should we keep RT objects in memory for extended time? */
1503 #define SIP_PAGE2_RTAUTOCLEAR (1 << 2) /*!< GP: Should we clean memory from peers after expiry? */
1504 #define SIP_PAGE2_RPID_UPDATE (1 << 3)
1505 /* Space for addition of other realtime flags in the future */
1506 #define SIP_PAGE2_SYMMETRICRTP (1 << 8) /*!< GDP: Whether symmetric RTP is enabled or not */
1507 #define SIP_PAGE2_STATECHANGEQUEUE (1 << 9) /*!< D: Unsent state pending change exists */
1509 #define SIP_PAGE2_CONNECTLINEUPDATE_PEND (1 << 10)
1510 #define SIP_PAGE2_RPID_IMMEDIATE (1 << 11)
1511 #define SIP_PAGE2_RPORT_PRESENT (1 << 12) /*!< Was rport received in the Via header? */
1512 #define SIP_PAGE2_PREFERRED_CODEC (1 << 13) /*!< GDP: Only respond with single most preferred joint codec */
1513 #define SIP_PAGE2_VIDEOSUPPORT (1 << 14) /*!< DP: Video supported if offered? */
1514 #define SIP_PAGE2_TEXTSUPPORT (1 << 15) /*!< GDP: Global text enable */
1515 #define SIP_PAGE2_ALLOWSUBSCRIBE (1 << 16) /*!< GP: Allow subscriptions from this peer? */
1516 #define SIP_PAGE2_ALLOWOVERLAP (1 << 17) /*!< DP: Allow overlap dialing ? */
1517 #define SIP_PAGE2_SUBSCRIBEMWIONLY (1 << 18) /*!< GP: Only issue MWI notification if subscribed to */
1518 #define SIP_PAGE2_IGNORESDPVERSION (1 << 19) /*!< GDP: Ignore the SDP session version number we receive and treat all sessions as new */
1520 #define SIP_PAGE2_T38SUPPORT (7 << 20) /*!< GDP: T.38 Fax Support */
1521 #define SIP_PAGE2_T38SUPPORT_UDPTL (1 << 20) /*!< GDP: T.38 Fax Support (no error correction) */
1522 #define SIP_PAGE2_T38SUPPORT_UDPTL_FEC (2 << 20) /*!< GDP: T.38 Fax Support (FEC error correction) */
1523 #define SIP_PAGE2_T38SUPPORT_UDPTL_REDUNDANCY (4 << 20) /*!< GDP: T.38 Fax Support (redundancy error correction) */
1525 #define SIP_PAGE2_CALL_ONHOLD (3 << 23) /*!< D: Call hold states: */
1526 #define SIP_PAGE2_CALL_ONHOLD_ACTIVE (1 << 23) /*!< D: Active hold */
1527 #define SIP_PAGE2_CALL_ONHOLD_ONEDIR (2 << 23) /*!< D: One directional hold */
1528 #define SIP_PAGE2_CALL_ONHOLD_INACTIVE (3 << 23) /*!< D: Inactive hold */
1530 #define SIP_PAGE2_RFC2833_COMPENSATE (1 << 25) /*!< DP: Compensate for buggy RFC2833 implementations */
1531 #define SIP_PAGE2_BUGGY_MWI (1 << 26) /*!< DP: Buggy CISCO MWI fix */
1532 #define SIP_PAGE2_DIALOG_ESTABLISHED (1 << 27) /*!< 29: Has a dialog been established? */
1533 #define SIP_PAGE2_FAX_DETECT (1 << 28) /*!< DP: Fax Detection support */
1534 #define SIP_PAGE2_REGISTERTRYING (1 << 29) /*!< DP: Send 100 Trying on REGISTER attempts */
1535 #define SIP_PAGE2_UDPTL_DESTINATION (1 << 30) /*!< DP: Use source IP of RTP as destination if NAT is enabled */
1536 #define SIP_PAGE2_VIDEOSUPPORT_ALWAYS (1 << 31) /*!< DP: Always set up video, even if endpoints don't support it */
1538 #define SIP_PAGE2_FLAGS_TO_COPY \
1539 (SIP_PAGE2_ALLOWSUBSCRIBE | SIP_PAGE2_ALLOWOVERLAP | SIP_PAGE2_IGNORESDPVERSION | \
1540 SIP_PAGE2_VIDEOSUPPORT | SIP_PAGE2_T38SUPPORT | SIP_PAGE2_RFC2833_COMPENSATE | \
1541 SIP_PAGE2_BUGGY_MWI | SIP_PAGE2_TEXTSUPPORT | SIP_PAGE2_FAX_DETECT | \
1542 SIP_PAGE2_UDPTL_DESTINATION | SIP_PAGE2_VIDEOSUPPORT_ALWAYS | SIP_PAGE2_PREFERRED_CODEC | \
1543 SIP_PAGE2_RPID_IMMEDIATE | SIP_PAGE2_RPID_UPDATE | SIP_PAGE2_SYMMETRICRTP)
1547 /*! \brief debugging state
1548 * We store separately the debugging requests from the config file
1549 * and requests from the CLI. Debugging is enabled if either is set
1550 * (which means that if sipdebug is set in the config file, we can
1551 * only turn it off by reloading the config).
1555 sip_debug_config = 1,
1556 sip_debug_console = 2,
1559 static enum sip_debug_e sipdebug;
1561 /*! \brief extra debugging for 'text' related events.
1562 * At the moment this is set together with sip_debug_console.
1563 * \note It should either go away or be implemented properly.
1565 static int sipdebug_text;
1567 /*! \brief T38 States for a call */
1569 T38_DISABLED = 0, /*!< Not enabled */
1570 T38_LOCAL_REINVITE, /*!< Offered from local - REINVITE */
1571 T38_PEER_REINVITE, /*!< Offered from peer - REINVITE */
1572 T38_ENABLED /*!< Negotiated (enabled) */
1575 /*! \brief T.38 channel settings (at some point we need to make this alloc'ed */
1576 struct t38properties {
1577 enum t38state state; /*!< T.38 state */
1578 struct ast_control_t38_parameters our_parms;
1579 struct ast_control_t38_parameters their_parms;
1582 /*! \brief Parameters to know status of transfer */
1584 REFER_IDLE, /*!< No REFER is in progress */
1585 REFER_SENT, /*!< Sent REFER to transferee */
1586 REFER_RECEIVED, /*!< Received REFER from transferrer */
1587 REFER_CONFIRMED, /*!< Refer confirmed with a 100 TRYING (unused) */
1588 REFER_ACCEPTED, /*!< Accepted by transferee */
1589 REFER_RINGING, /*!< Target Ringing */
1590 REFER_200OK, /*!< Answered by transfer target */
1591 REFER_FAILED, /*!< REFER declined - go on */
1592 REFER_NOAUTH /*!< We had no auth for REFER */
1595 /*! \brief generic struct to map between strings and integers.
1596 * Fill it with x-s pairs, terminate with an entry with s = NULL;
1597 * Then you can call map_x_s(...) to map an integer to a string,
1598 * and map_s_x() for the string -> integer mapping.
1605 static const struct _map_x_s referstatusstrings[] = {
1606 { REFER_IDLE, "<none>" },
1607 { REFER_SENT, "Request sent" },
1608 { REFER_RECEIVED, "Request received" },
1609 { REFER_CONFIRMED, "Confirmed" },
1610 { REFER_ACCEPTED, "Accepted" },
1611 { REFER_RINGING, "Target ringing" },
1612 { REFER_200OK, "Done" },
1613 { REFER_FAILED, "Failed" },
1614 { REFER_NOAUTH, "Failed - auth failure" },
1615 { -1, NULL} /* terminator */
1618 /*! \brief Structure to handle SIP transfers. Dynamically allocated when needed
1619 \note OEJ: Should be moved to string fields */
1621 char refer_to[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO extension */
1622 char refer_to_domain[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO domain */
1623 char refer_to_urioption[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO uri options */
1624 char refer_to_context[AST_MAX_EXTENSION]; /*!< Place to store REFER-TO context */
1625 char referred_by[AST_MAX_EXTENSION]; /*!< Place to store REFERRED-BY extension */
1626 char referred_by_name[AST_MAX_EXTENSION]; /*!< Place to store REFERRED-BY extension */
1627 char refer_contact[AST_MAX_EXTENSION]; /*!< Place to store Contact info from a REFER extension */
1628 char replaces_callid[SIPBUFSIZE]; /*!< Replace info: callid */
1629 char replaces_callid_totag[SIPBUFSIZE/2]; /*!< Replace info: to-tag */
1630 char replaces_callid_fromtag[SIPBUFSIZE/2]; /*!< Replace info: from-tag */
1631 struct sip_pvt *refer_call; /*!< Call we are referring. This is just a reference to a
1632 * dialog owned by someone else, so we should not destroy
1633 * it when the sip_refer object goes.
1635 int attendedtransfer; /*!< Attended or blind transfer? */
1636 int localtransfer; /*!< Transfer to local domain? */
1637 enum referstatus status; /*!< REFER status */
1641 /*! \brief Structure that encapsulates all attributes related to running
1642 * SIP Session-Timers feature on a per dialog basis.
1645 int st_active; /*!< Session-Timers on/off */
1646 int st_interval; /*!< Session-Timers negotiated session refresh interval */
1647 int st_schedid; /*!< Session-Timers ast_sched scheduler id */
1648 enum st_refresher st_ref; /*!< Session-Timers session refresher */
1649 int st_expirys; /*!< Session-Timers number of expirys */
1650 int st_active_peer_ua; /*!< Session-Timers on/off in peer UA */
1651 int st_cached_min_se; /*!< Session-Timers cached Min-SE */
1652 int st_cached_max_se; /*!< Session-Timers cached Session-Expires */
1653 enum st_mode st_cached_mode; /*!< Session-Timers cached M.O. */
1654 enum st_refresher st_cached_ref; /*!< Session-Timers cached refresher */
1658 /*! \brief Structure that encapsulates all attributes related to configuration
1659 * of SIP Session-Timers feature on a per user/peer basis.
1662 enum st_mode st_mode_oper; /*!< Mode of operation for Session-Timers */
1663 enum st_refresher st_ref; /*!< Session-Timer refresher */
1664 int st_min_se; /*!< Lowest threshold for session refresh interval */
1665 int st_max_se; /*!< Highest threshold for session refresh interval */
1668 /*! \brief Structure for remembering offered media in an INVITE, to make sure we reply
1669 to all media streams. In theory. In practise, we try our best. */
1670 struct offered_media {
1675 /*! \brief Structure used for each SIP dialog, ie. a call, a registration, a subscribe.
1676 * Created and initialized by sip_alloc(), the descriptor goes into the list of
1677 * descriptors (dialoglist).
1680 struct sip_pvt *next; /*!< Next dialog in chain */
1681 enum invitestates invitestate; /*!< Track state of SIP_INVITEs */
1682 int method; /*!< SIP method that opened this dialog */
1683 AST_DECLARE_STRING_FIELDS(
1684 AST_STRING_FIELD(callid); /*!< Global CallID */
1685 AST_STRING_FIELD(randdata); /*!< Random data */
1686 AST_STRING_FIELD(accountcode); /*!< Account code */
1687 AST_STRING_FIELD(realm); /*!< Authorization realm */
1688 AST_STRING_FIELD(nonce); /*!< Authorization nonce */
1689 AST_STRING_FIELD(opaque); /*!< Opaque nonsense */
1690 AST_STRING_FIELD(qop); /*!< Quality of Protection, since SIP wasn't complicated enough yet. */
1691 AST_STRING_FIELD(domain); /*!< Authorization domain */
1692 AST_STRING_FIELD(from); /*!< The From: header */
1693 AST_STRING_FIELD(useragent); /*!< User agent in SIP request */
1694 AST_STRING_FIELD(exten); /*!< Extension where to start */
1695 AST_STRING_FIELD(context); /*!< Context for this call */
1696 AST_STRING_FIELD(subscribecontext); /*!< Subscribecontext */
1697 AST_STRING_FIELD(subscribeuri); /*!< Subscribecontext */
1698 AST_STRING_FIELD(fromdomain); /*!< Domain to show in the from field */
1699 AST_STRING_FIELD(fromuser); /*!< User to show in the user field */
1700 AST_STRING_FIELD(fromname); /*!< Name to show in the user field */
1701 AST_STRING_FIELD(tohost); /*!< Host we should put in the "to" field */
1702 AST_STRING_FIELD(todnid); /*!< DNID of this call (overrides host) */
1703 AST_STRING_FIELD(language); /*!< Default language for this call */
1704 AST_STRING_FIELD(mohinterpret); /*!< MOH class to use when put on hold */
1705 AST_STRING_FIELD(mohsuggest); /*!< MOH class to suggest when putting a peer on hold */
1706 AST_STRING_FIELD(rdnis); /*!< Referring DNIS */
1707 AST_STRING_FIELD(redircause); /*!< Referring cause */
1708 AST_STRING_FIELD(theirtag); /*!< Their tag */
1709 AST_STRING_FIELD(username); /*!< [user] name */
1710 AST_STRING_FIELD(peername); /*!< [peer] name, not set if [user] */
1711 AST_STRING_FIELD(authname); /*!< Who we use for authentication */
1712 AST_STRING_FIELD(uri); /*!< Original requested URI */
1713 AST_STRING_FIELD(okcontacturi); /*!< URI from the 200 OK on INVITE */
1714 AST_STRING_FIELD(peersecret); /*!< Password */
1715 AST_STRING_FIELD(peermd5secret);
1716 AST_STRING_FIELD(cid_num); /*!< Caller*ID number */
1717 AST_STRING_FIELD(cid_name); /*!< Caller*ID name */
1718 AST_STRING_FIELD(mwi_from); /*!< Name to place in the From header in outgoing NOTIFY requests */
1719 AST_STRING_FIELD(fullcontact); /*!< The Contact: that the UA registers with us */
1720 /* we only store the part in <brackets> in this field. */
1721 AST_STRING_FIELD(our_contact); /*!< Our contact header */
1722 AST_STRING_FIELD(url); /*!< URL to be sent with next message to peer */
1723 AST_STRING_FIELD(parkinglot); /*!< Parkinglot */
1724 AST_STRING_FIELD(engine); /*!< RTP engine to use */
1726 char via[128]; /*!< Via: header */
1727 struct sip_socket socket; /*!< The socket used for this dialog */
1728 unsigned int ocseq; /*!< Current outgoing seqno */
1729 unsigned int icseq; /*!< Current incoming seqno */
1730 ast_group_t callgroup; /*!< Call group */
1731 ast_group_t pickupgroup; /*!< Pickup group */
1732 int lastinvite; /*!< Last Cseq of invite */
1733 struct ast_flags flags[2]; /*!< SIP_ flags */
1735 /* boolean flags that don't belong in flags */
1736 unsigned short do_history:1; /*!< Set if we want to record history */
1737 unsigned short alreadygone:1; /*!< already destroyed by our peer */
1738 unsigned short needdestroy:1; /*!< need to be destroyed by the monitor thread */
1739 unsigned short outgoing_call:1; /*!< this is an outgoing call */
1740 unsigned short answered_elsewhere:1; /*!< This call is cancelled due to answer on another channel */
1741 unsigned short novideo:1; /*!< Didn't get video in invite, don't offer */
1742 unsigned short notext:1; /*!< Text not supported (?) */
1743 unsigned short session_modify:1; /*!< Session modification request true/false */
1744 unsigned short route_persistent:1; /*!< Is this the "real" route? */
1745 unsigned short autoframing:1; /*!< Whether to use our local configuration for frame sizes (off)
1746 * or respect the other endpoint's request for frame sizes (on)
1747 * for incoming calls
1749 char tag[11]; /*!< Our tag for this session */
1750 int timer_t1; /*!< SIP timer T1, ms rtt */
1751 int timer_b; /*!< SIP timer B, ms */
1752 unsigned int sipoptions; /*!< Supported SIP options on the other end */
1753 unsigned int reqsipoptions; /*!< Required SIP options on the other end */
1754 struct ast_codec_pref prefs; /*!< codec prefs */
1755 int capability; /*!< Special capability (codec) */
1756 int jointcapability; /*!< Supported capability at both ends (codecs) */
1757 int peercapability; /*!< Supported peer capability */
1758 int prefcodec; /*!< Preferred codec (outbound only) */
1759 int noncodeccapability; /*!< DTMF RFC2833 telephony-event */
1760 int jointnoncodeccapability; /*!< Joint Non codec capability */
1761 int redircodecs; /*!< Redirect codecs */
1762 int maxcallbitrate; /*!< Maximum Call Bitrate for Video Calls */
1763 int request_queue_sched_id; /*!< Scheduler ID of any scheduled action to process queued requests */
1764 int provisional_keepalive_sched_id; /*!< Scheduler ID for provisional responses that need to be sent out to avoid cancellation */
1765 const char *last_provisional; /*!< The last successfully transmitted provisonal response message */
1766 int authtries; /*!< Times we've tried to authenticate */
1767 struct sip_proxy *outboundproxy; /*!< Outbound proxy for this dialog. Use ref_proxy to set this instead of setting it directly*/
1768 struct t38properties t38; /*!< T38 settings */
1769 struct sockaddr_in udptlredirip; /*!< Where our T.38 UDPTL should be going if not to us */
1770 struct ast_udptl *udptl; /*!< T.38 UDPTL session */
1771 int callingpres; /*!< Calling presentation */
1772 int expiry; /*!< How long we take to expire */
1773 int sessionversion; /*!< SDP Session Version */
1774 int sessionid; /*!< SDP Session ID */
1775 long branch; /*!< The branch identifier of this session */
1776 long invite_branch; /*!< The branch used when we sent the initial INVITE */
1777 int64_t sessionversion_remote; /*!< Remote UA's SDP Session Version */
1778 struct sockaddr_in sa; /*!< Our peer */
1779 struct sockaddr_in redirip; /*!< Where our RTP should be going if not to us */
1780 struct sockaddr_in vredirip; /*!< Where our Video RTP should be going if not to us */
1781 struct sockaddr_in tredirip; /*!< Where our Text RTP should be going if not to us */
1782 time_t lastrtprx; /*!< Last RTP received */
1783 time_t lastrtptx; /*!< Last RTP sent */
1784 int rtptimeout; /*!< RTP timeout time */
1785 struct sockaddr_in recv; /*!< Received as */
1786 struct sockaddr_in ourip; /*!< Our IP (as seen from the outside) */
1787 enum transfermodes allowtransfer; /*!< REFER: restriction scheme */
1788 struct ast_channel *owner; /*!< Who owns us (if we have an owner) */
1789 struct sip_route *route; /*!< Head of linked list of routing steps (fm Record-Route) */
1790 struct ast_variable *notify_headers; /*!< Custom notify type */
1791 struct sip_auth *peerauth; /*!< Realm authentication */
1792 int noncecount; /*!< Nonce-count */
1793 unsigned int stalenonce:1; /*!< Marks the current nonce as responded too */
1794 char lastmsg[256]; /*!< Last Message sent/received */
1795 int amaflags; /*!< AMA Flags */
1796 int pendinginvite; /*!< Any pending INVITE or state NOTIFY (in subscribe pvt's) ? (seqno of this) */
1797 int glareinvite; /*!< A invite received while a pending invite is already present is stored here. Its seqno is the
1798 value. Since this glare invite's seqno is not the same as the pending invite's, it must be
1799 held in order to properly process acknowledgements for our 491 response. */
1800 struct sip_request initreq; /*!< Latest request that opened a new transaction
1802 NOT the request that opened the dialog */
1804 int initid; /*!< Auto-congest ID if appropriate (scheduler) */
1805 int waitid; /*!< Wait ID for scheduler after 491 or other delays */
1806 int autokillid; /*!< Auto-kill ID (scheduler) */
1807 int t38id; /*!< T.38 Response ID */
1808 struct sip_refer *refer; /*!< REFER: SIP transfer data structure */
1809 enum subscriptiontype subscribed; /*!< SUBSCRIBE: Is this dialog a subscription? */
1810 int stateid; /*!< SUBSCRIBE: ID for devicestate subscriptions */
1811 int laststate; /*!< SUBSCRIBE: Last known extension state */
1812 int dialogver; /*!< SUBSCRIBE: Version for subscription dialog-info */
1814 struct ast_dsp *dsp; /*!< Inband DTMF Detection dsp */
1816 struct sip_peer *relatedpeer; /*!< If this dialog is related to a peer, which one
1817 Used in peerpoke, mwi subscriptions */
1818 struct sip_registry *registry; /*!< If this is a REGISTER dialog, to which registry */
1819 struct ast_rtp_instance *rtp; /*!< RTP Session */
1820 struct ast_rtp_instance *vrtp; /*!< Video RTP session */
1821 struct ast_rtp_instance *trtp; /*!< Text RTP session */
1822 struct sip_pkt *packets; /*!< Packets scheduled for re-transmission */
1823 struct sip_history_head *history; /*!< History of this SIP dialog */
1824 size_t history_entries; /*!< Number of entires in the history */
1825 struct ast_variable *chanvars; /*!< Channel variables to set for inbound call */
1826 AST_LIST_HEAD_NOLOCK(request_queue, sip_request) request_queue; /*!< Requests that arrived but could not be processed immediately */
1827 struct sip_invite_param *options; /*!< Options for INVITE */
1828 struct sip_st_dlg *stimer; /*!< SIP Session-Timers */
1830 int red; /*!< T.140 RTP Redundancy */
1831 int hangupcause; /*!< Storage of hangupcause copied from our owner before we disconnect from the AST channel (only used at hangup) */
1833 struct sip_subscription_mwi *mwi; /*!< If this is a subscription MWI dialog, to which subscription */
1834 /*! The SIP methods supported by this peer. We get this information from the Allow header of the first
1835 * message we receive from an endpoint during a dialog.
1837 unsigned int allowed_methods;
1838 /*! Some peers are not trustworthy with their Allow headers, and so we need to override their wicked
1839 * ways through configuration. This is a copy of the peer's disallowed_methods, so that we can apply them
1840 * to the sip_pvt at various stages of dialog establishment
1842 unsigned int disallowed_methods;
1843 /*! When receiving an SDP offer, it is important to take note of what media types were offered.
1844 * By doing this, even if we don't want to answer a particular media stream with something meaningful, we can
1845 * still put an m= line in our answer with the port set to 0.
1847 * The reason for the length being 4 (OFFERED_MEDIA_COUNT) is that in this branch of Asterisk, the only media types supported are
1848 * image, audio, text, and video. Therefore we need to keep track of which types of media were offered.
1849 * Note that secure RTP defines new types of SDP media.
1851 * If we wanted to be 100% correct, we would keep a list of all media streams offered. That way we could respond
1852 * even to unknown media types, and we could respond to multiple streams of the same type. Such large-scale changes
1853 * are not a good idea for released branches, though, so we're compromising by just making sure that for the common cases:
1854 * audio and video, audio and T.38, and audio and text, we give the appropriate response to both media streams.
1856 * The large-scale changes would be a good idea for implementing during an SDP rewrite.
1858 struct offered_media offered_media[OFFERED_MEDIA_COUNT];
1863 * Here we implement the container for dialogs (sip_pvt), defining
1864 * generic wrapper functions to ease the transition from the current
1865 * implementation (a single linked list) to a different container.
1866 * In addition to a reference to the container, we need functions to lock/unlock
1867 * the container and individual items, and functions to add/remove
1868 * references to the individual items.
1870 static struct ao2_container *dialogs;
1872 #define sip_pvt_lock(x) ao2_lock(x)
1873 #define sip_pvt_trylock(x) ao2_trylock(x)
1874 #define sip_pvt_unlock(x) ao2_unlock(x)
1877 * when we create or delete references, make sure to use these
1878 * functions so we keep track of the refcounts.
1879 * To simplify the code, we allow a NULL to be passed to dialog_unref().
1882 #define dialog_ref(arg1,arg2) dialog_ref_debug((arg1),(arg2), __FILE__, __LINE__, __PRETTY_FUNCTION__)
1883 #define dialog_unref(arg1,arg2) dialog_unref_debug((arg1),(arg2), __FILE__, __LINE__, __PRETTY_FUNCTION__)
1885 static struct sip_pvt *dialog_ref_debug(struct sip_pvt *p, char *tag, char *file, int line, const char *func)
1888 _ao2_ref_debug(p, 1, tag, file, line, func);
1890 ast_log(LOG_ERROR, "Attempt to Ref a null pointer\n");
1894 static struct sip_pvt *dialog_unref_debug(struct sip_pvt *p, char *tag, char *file, int line, const char *func)
1897 _ao2_ref_debug(p, -1, tag, file, line, func);
1901 static struct sip_pvt *dialog_ref(struct sip_pvt *p, char *tag)
1906 ast_log(LOG_ERROR, "Attempt to Ref a null pointer\n");
1910 static struct sip_pvt *dialog_unref(struct sip_pvt *p, char *tag)
1918 /*! \brief sip packet - raw format for outbound packets that are sent or scheduled for transmission
1919 * Packets are linked in a list, whose head is in the struct sip_pvt they belong to.
1920 * Each packet holds a reference to the parent struct sip_pvt.
1921 * This structure is allocated in __sip_reliable_xmit() and only for packets that
1922 * require retransmissions.
1925 struct sip_pkt *next; /*!< Next packet in linked list */
1926 int retrans; /*!< Retransmission number */
1927 int method; /*!< SIP method for this packet */
1928 int seqno; /*!< Sequence number */
1929 char is_resp; /*!< 1 if this is a response packet (e.g. 200 OK), 0 if it is a request */
1930 char is_fatal; /*!< non-zero if there is a fatal error */
1931 int response_code; /*!< If this is a response, the response code */
1932 struct sip_pvt *owner; /*!< Owner AST call */
1933 int retransid; /*!< Retransmission ID */
1934 int timer_a; /*!< SIP timer A, retransmission timer */
1935 int timer_t1; /*!< SIP Timer T1, estimated RTT or 500 ms */
1936 int packetlen; /*!< Length of packet */
1937 struct ast_str *data;
1941 * \brief A peer's mailbox
1943 * We could use STRINGFIELDS here, but for only two strings, it seems like
1944 * too much effort ...
1946 struct sip_mailbox {
1949 /*! Associated MWI subscription */
1950 struct ast_event_sub *event_sub;
1951 AST_LIST_ENTRY(sip_mailbox) entry;
1954 enum sip_peer_type {
1955 SIP_TYPE_PEER = (1 << 0),
1956 SIP_TYPE_USER = (1 << 1),
1959 /*! \brief Structure for SIP peer data, we place calls to peers if registered or fixed IP address (host)
1961 /* XXX field 'name' must be first otherwise sip_addrcmp() will fail, as will astobj2 hashing of the structure */
1963 char name[80]; /*!< the unique name of this object */
1964 AST_DECLARE_STRING_FIELDS(
1965 AST_STRING_FIELD(secret); /*!< Password for inbound auth */
1966 AST_STRING_FIELD(md5secret); /*!< Password in MD5 */
1967 AST_STRING_FIELD(remotesecret); /*!< Remote secret (trunks, remote devices) */
1968 AST_STRING_FIELD(context); /*!< Default context for incoming calls */
1969 AST_STRING_FIELD(subscribecontext); /*!< Default context for subscriptions */
1970 AST_STRING_FIELD(username); /*!< Temporary username until registration */
1971 AST_STRING_FIELD(accountcode); /*!< Account code */
1972 AST_STRING_FIELD(tohost); /*!< If not dynamic, IP address */
1973 AST_STRING_FIELD(regexten); /*!< Extension to register (if regcontext is used) */
1974 AST_STRING_FIELD(fromuser); /*!< From: user when calling this peer */
1975 AST_STRING_FIELD(fromdomain); /*!< From: domain when calling this peer */
1976 AST_STRING_FIELD(fullcontact); /*!< Contact registered with us (not in sip.conf) */
1977 AST_STRING_FIELD(cid_num); /*!< Caller ID num */
1978 AST_STRING_FIELD(cid_name); /*!< Caller ID name */
1979 AST_STRING_FIELD(vmexten); /*!< Dialplan extension for MWI notify message*/
1980 AST_STRING_FIELD(language); /*!< Default language for prompts */
1981 AST_STRING_FIELD(mohinterpret); /*!< Music on Hold class */
1982 AST_STRING_FIELD(mohsuggest); /*!< Music on Hold class */
1983 AST_STRING_FIELD(parkinglot); /*!< Parkinglot */
1984 AST_STRING_FIELD(useragent); /*!< User agent in SIP request (saved from registration) */
1985 AST_STRING_FIELD(mwi_from); /*!< Name to place in From header for outgoing NOTIFY requests */
1986 AST_STRING_FIELD(engine); /*!< RTP Engine to use */
1988 struct sip_socket socket; /*!< Socket used for this peer */
1989 enum sip_transport default_outbound_transport; /*!< Peer Registration may change the default outbound transport.
1990 If register expires, default should be reset. to this value */
1991 /* things that don't belong in flags */
1992 unsigned short transports:3; /*!< Transports (enum sip_transport) that are acceptable for this peer */
1993 unsigned short is_realtime:1; /*!< this is a 'realtime' peer */
1994 unsigned short rt_fromcontact:1;/*!< copy fromcontact from realtime */
1995 unsigned short host_dynamic:1; /*!< Dynamic Peers register with Asterisk */
1996 unsigned short selfdestruct:1; /*!< Automatic peers need to destruct themselves */
1997 unsigned short the_mark:1; /*!< moved out of ASTOBJ into struct proper; That which bears the_mark should be deleted! */
1998 unsigned short autoframing:1; /*!< Whether to use our local configuration for frame sizes (off)
1999 * or respect the other endpoint's request for frame sizes (on)
2000 * for incoming calls
2002 unsigned short deprecated_username:1; /*!< If it's a realtime peer, are they using the deprecated "username" instead of "defaultuser" */
2003 struct sip_auth *auth; /*!< Realm authentication list */
2004 int amaflags; /*!< AMA Flags (for billing) */
2005 int callingpres; /*!< Calling id presentation */
2006 int inUse; /*!< Number of calls in use */
2007 int inRinging; /*!< Number of calls ringing */
2008 int onHold; /*!< Peer has someone on hold */
2009 int call_limit; /*!< Limit of concurrent calls */
2010 int busy_level; /*!< Level of active channels where we signal busy */
2011 enum transfermodes allowtransfer; /*! SIP Refer restriction scheme */
2012 struct ast_codec_pref prefs; /*!< codec prefs */
2014 unsigned int sipoptions; /*!< Supported SIP options */
2015 struct ast_flags flags[2]; /*!< SIP_ flags */
2017 /*! Mailboxes that this peer cares about */
2018 AST_LIST_HEAD_NOLOCK(, sip_mailbox) mailboxes;
2020 int maxcallbitrate; /*!< Maximum Bitrate for a video call */
2021 int expire; /*!< When to expire this peer registration */
2022 int capability; /*!< Codec capability */
2023 int rtptimeout; /*!< RTP timeout */
2024 int rtpholdtimeout; /*!< RTP Hold Timeout */
2025 int rtpkeepalive; /*!< Send RTP packets for keepalive */
2026 ast_group_t callgroup; /*!< Call group */
2027 ast_group_t pickupgroup; /*!< Pickup group */
2028 struct sip_proxy *outboundproxy; /*!< Outbound proxy for this peer */
2029 struct ast_dnsmgr_entry *dnsmgr;/*!< DNS refresh manager for peer */
2030 struct sockaddr_in addr; /*!< IP address of peer */
2031 struct sip_pvt *call; /*!< Call pointer */
2032 int pokeexpire; /*!< Qualification: When to expire poke (qualify= checking) */
2033 int lastms; /*!< Qualification: How long last response took (in ms), or -1 for no response */
2034 int maxms; /*!< Qualification: Max ms we will accept for the host to be up, 0 to not monitor */
2035 int qualifyfreq; /*!< Qualification: Qualification: How often to check for the host to be up */
2036 struct timeval ps; /*!< Qualification: Time for sending SIP OPTION in sip_pke_peer() */
2037 struct sockaddr_in defaddr; /*!< Default IP address, used until registration */
2038 struct ast_ha *ha; /*!< Access control list */
2039 struct ast_ha *contactha; /*!< Restrict what IPs are allowed in the Contact header (for registration) */
2040 struct ast_variable *chanvars; /*!< Variables to set for channel created by user */
2041 struct sip_pvt *mwipvt; /*!< Subscription for MWI */
2042 struct sip_st_cfg stimer; /*!< SIP Session-Timers */
2043 int timer_t1; /*!< The maximum T1 value for the peer */
2044 int timer_b; /*!< The maximum timer B (transaction timeouts) */
2046 /*XXX Seems like we suddenly have two flags with the same content. Why? To be continued... */
2047 enum sip_peer_type type; /*!< Distinguish between "user" and "peer" types. This is used solely for CLI and manager commands */
2048 unsigned int disallowed_methods;
2053 * \brief Registrations with other SIP proxies
2055 * Created by sip_register(), the entry is linked in the 'regl' list,
2056 * and never deleted (other than at 'sip reload' or module unload times).
2057 * The entry always has a pending timeout, either waiting for an ACK to
2058 * the REGISTER message (in which case we have to retransmit the request),
2059 * or waiting for the next REGISTER message to be sent (either the initial one,
2060 * or once the previously completed registration one expires).
2061 * The registration can be in one of many states, though at the moment
2062 * the handling is a bit mixed.
2064 struct sip_registry {
2065 ASTOBJ_COMPONENTS_FULL(struct sip_registry,1,1);
2066 AST_DECLARE_STRING_FIELDS(
2067 AST_STRING_FIELD(callid); /*!< Global Call-ID */
2068 AST_STRING_FIELD(realm); /*!< Authorization realm */
2069 AST_STRING_FIELD(nonce); /*!< Authorization nonce */
2070 AST_STRING_FIELD(opaque); /*!< Opaque nonsense */
2071 AST_STRING_FIELD(qop); /*!< Quality of Protection, since SIP wasn't complicated enough yet. */
2072 AST_STRING_FIELD(authdomain); /*!< Authorization domain */
2073 AST_STRING_FIELD(regdomain); /*!< Registration domain */
2074 AST_STRING_FIELD(username); /*!< Who we are registering as */
2075 AST_STRING_FIELD(authuser); /*!< Who we *authenticate* as */
2076 AST_STRING_FIELD(hostname); /*!< Domain or host we register to */
2077 AST_STRING_FIELD(secret); /*!< Password in clear text */
2078 AST_STRING_FIELD(md5secret); /*!< Password in md5 */
2079 AST_STRING_FIELD(callback); /*!< Contact extension */
2080 AST_STRING_FIELD(peername); /*!< Peer registering to */
2082 enum sip_transport transport; /*!< Transport for this registration UDP, TCP or TLS */
2083 int portno; /*!< Optional port override */
2084 int expire; /*!< Sched ID of expiration */
2085 int configured_expiry; /*!< Configured value to use for the Expires header */
2086 int expiry; /*!< Negotiated value used for the Expires header */
2087 int regattempts; /*!< Number of attempts (since the last success) */
2088 int timeout; /*!< sched id of sip_reg_timeout */
2089 int refresh; /*!< How often to refresh */
2090 struct sip_pvt *call; /*!< create a sip_pvt structure for each outbound "registration dialog" in progress */
2091 enum sipregistrystate regstate; /*!< Registration state (see above) */
2092 struct timeval regtime; /*!< Last successful registration time */
2093 int callid_valid; /*!< 0 means we haven't chosen callid for this registry yet. */
2094 unsigned int ocseq; /*!< Sequence number we got to for REGISTERs for this registry */
2095 struct ast_dnsmgr_entry *dnsmgr; /*!< DNS refresh manager for register */
2096 struct sockaddr_in us; /*!< Who the server thinks we are */
2097 int noncecount; /*!< Nonce-count */
2098 char lastmsg[256]; /*!< Last Message sent/received */
2101 /*! \brief Definition of a thread that handles a socket */
2102 struct sip_threadinfo {
2105 struct ast_tcptls_session_instance *tcptls_session;
2106 enum sip_transport type; /*!< We keep a copy of the type here so we can display it in the connection list */
2107 AST_LIST_ENTRY(sip_threadinfo) list;
2110 /*! \brief Definition of an MWI subscription to another server */
2111 struct sip_subscription_mwi {
2112 ASTOBJ_COMPONENTS_FULL(struct sip_subscription_mwi,1,1);
2113 AST_DECLARE_STRING_FIELDS(
2114 AST_STRING_FIELD(username); /*!< Who we are sending the subscription as */
2115 AST_STRING_FIELD(authuser); /*!< Who we *authenticate* as */
2116 AST_STRING_FIELD(hostname); /*!< Domain or host we subscribe to */
2117 AST_STRING_FIELD(secret); /*!< Password in clear text */
2118 AST_STRING_FIELD(mailbox); /*!< Mailbox store to put MWI into */
2120 enum sip_transport transport; /*!< Transport to use */
2121 int portno; /*!< Optional port override */
2122 int resub; /*!< Sched ID of resubscription */
2123 unsigned int subscribed:1; /*!< Whether we are currently subscribed or not */
2124 struct sip_pvt *call; /*!< Outbound subscription dialog */
2125 struct ast_dnsmgr_entry *dnsmgr; /*!< DNS refresh manager for subscription */
2126 struct sockaddr_in us; /*!< Who the server thinks we are */
2129 /* --- Hash tables of various objects --------*/
2132 static int hash_peer_size = 17;
2133 static int hash_dialog_size = 17;
2134 static int hash_user_size = 17;
2136 static int hash_peer_size = 563; /*!< Size of peer hash table, prime number preferred! */
2137 static int hash_dialog_size = 563;
2138 static int hash_user_size = 563;
2141 /*! \brief The thread list of TCP threads */
2142 static AST_LIST_HEAD_STATIC(threadl, sip_threadinfo);
2144 /*! \brief The peer list: Users, Peers and Friends */
2145 static struct ao2_container *peers;
2146 static struct ao2_container *peers_by_ip;
2148 /*! \brief The register list: Other SIP proxies we register with and receive calls from */
2149 static struct ast_register_list {
2150 ASTOBJ_CONTAINER_COMPONENTS(struct sip_registry);
2154 /*! \brief The MWI subscription list */
2155 static struct ast_subscription_mwi_list {
2156 ASTOBJ_CONTAINER_COMPONENTS(struct sip_subscription_mwi);
2160 * \note The only member of the peer used here is the name field
2162 static int peer_hash_cb(const void *obj, const int flags)
2164 const struct sip_peer *peer = obj;
2166 return ast_str_case_hash(peer->name);
2170 * \note The only member of the peer used here is the name field
2172 static int peer_cmp_cb(void *obj, void *arg, int flags)
2174 struct sip_peer *peer = obj, *peer2 = arg;
2176 return !strcasecmp(peer->name, peer2->name) ? CMP_MATCH | CMP_STOP : 0;
2180 * \note the peer's ip address field is used to create key.
2182 static int peer_iphash_cb(const void *obj, const int flags)
2184 const struct sip_peer *peer = obj;
2185 int ret1 = peer->addr.sin_addr.s_addr;
2193 * Match Peers by IP and Port number.
2195 * This function has two modes.
2196 * - If the peer arg does not have INSECURE_PORT set, then we will only return
2197 * a match for a peer that matches both the IP and port.
2198 * - If the peer arg does have the INSECURE_PORT flag set, then we will only
2199 * return a match for a peer that matches the IP and has insecure=port
2200 * in its configuration.
2202 * This callback will be used twice when doing peer matching. There is a first
2203 * pass for full IP+port matching, and a second pass in case there is a match
2204 * that meets the insecure=port criteria.
2206 * \note Connections coming in over TCP or TLS should never be matched by port.
2208 * \note the peer's addr struct provides to fields combined to make a key: the sin_addr.s_addr and sin_port fields.
2210 static int peer_ipcmp_cb(void *obj, void *arg, int flags)
2212 struct sip_peer *peer = obj, *peer2 = arg;
2214 if (peer->addr.sin_addr.s_addr != peer2->addr.sin_addr.s_addr) {
2215 /* IP doesn't match */
2219 /* We matched the IP, check to see if we need to match by port as well. */
2220 if ((peer->transports & peer2->transports) & (SIP_TRANSPORT_TLS | SIP_TRANSPORT_TCP)) {
2221 /* peer matching on port is not possible with TCP/TLS */
2222 return CMP_MATCH | CMP_STOP;
2223 } else if (ast_test_flag(&peer2->flags[0], SIP_INSECURE_PORT)) {
2224 /* We are allowing match without port for peers configured that
2225 * way in this pass through the peers. */
2226 return ast_test_flag(&peer->flags[0], SIP_INSECURE_PORT) ?
2227 (CMP_MATCH | CMP_STOP) : 0;
2230 /* Now only return a match if the port matches, as well. */
2231 return peer->addr.sin_port == peer2->addr.sin_port ? (CMP_MATCH | CMP_STOP) : 0;
2235 * \note The only member of the dialog used here callid string
2237 static int dialog_hash_cb(const void *obj, const int flags)
2239 const struct sip_pvt *pvt = obj;
2241 return ast_str_case_hash(pvt->callid);
2245 * \note The only member of the dialog used here callid string
2247 static int dialog_cmp_cb(void *obj, void *arg, int flags)
2249 struct sip_pvt *pvt = obj, *pvt2 = arg;
2251 return !strcasecmp(pvt->callid, pvt2->callid) ? CMP_MATCH | CMP_STOP : 0;
2254 static int temp_pvt_init(void *);
2255 static void temp_pvt_cleanup(void *);
2257 /*! \brief A per-thread temporary pvt structure */
2258 AST_THREADSTORAGE_CUSTOM(ts_temp_pvt, temp_pvt_init, temp_pvt_cleanup);
2261 static void ts_ast_rtp_destroy(void *);
2263 AST_THREADSTORAGE_CUSTOM(ts_audio_rtp, NULL, ts_ast_rtp_destroy);
2264 AST_THREADSTORAGE_CUSTOM(ts_video_rtp, NULL, ts_ast_rtp_destroy);
2265 AST_THREADSTORAGE_CUSTOM(ts_text_rtp, NULL, ts_ast_rtp_destroy);
2268 /*! \brief Authentication list for realm authentication
2269 * \todo Move the sip_auth list to AST_LIST */
2270 static struct sip_auth *authl = NULL;
2273 /* --- Sockets and networking --------------*/
2275 /*! \brief Main socket for UDP SIP communication.
2277 * sipsock is shared between the SIP manager thread (which handles reload
2278 * requests), the udp io handler (sipsock_read()) and the user routines that
2279 * issue udp writes (using __sip_xmit()).
2280 * The socket is -1 only when opening fails (this is a permanent condition),
2281 * or when we are handling a reload() that changes its address (this is
2282 * a transient situation during which we might have a harmless race, see
2283 * below). Because the conditions for the race to be possible are extremely
2284 * rare, we don't want to pay the cost of locking on every I/O.
2285 * Rather, we remember that when the race may occur, communication is
2286 * bound to fail anyways, so we just live with this event and let
2287 * the protocol handle this above us.
2289 static int sipsock = -1;
2291 static struct sockaddr_in bindaddr; /*!< UDP: The address we bind to */
2293 /*! \brief our (internal) default address/port to put in SIP/SDP messages
2294 * internip is initialized picking a suitable address from one of the
2295 * interfaces, and the same port number we bind to. It is used as the
2296 * default address/port in SIP messages, and as the default address
2297 * (but not port) in SDP messages.
2299 static struct sockaddr_in internip;
2301 /*! \brief our external IP address/port for SIP sessions.
2302 * externip.sin_addr is only set when we know we might be behind
2303 * a NAT, and this is done using a variety of (mutually exclusive)
2304 * ways from the config file:
2306 * + with "externip = host[:port]" we specify the address/port explicitly.
2307 * The address is looked up only once when (re)loading the config file;
2309 * + with "externhost = host[:port]" we do a similar thing, but the
2310 * hostname is stored in externhost, and the hostname->IP mapping
2311 * is refreshed every 'externrefresh' seconds;
2313 * + with "stunaddr = host[:port]" we run queries every externrefresh seconds
2314 * to the specified server, and store the result in externip.
2316 * Other variables (externhost, externexpire, externrefresh) are used
2317 * to support the above functions.
2319 static struct sockaddr_in externip; /*!< External IP address if we are behind NAT */
2321 static char externhost[MAXHOSTNAMELEN]; /*!< External host name */
2322 static time_t externexpire; /*!< Expiration counter for re-resolving external host name in dynamic DNS */
2323 static int externrefresh = 10; /*!< Refresh timer for DNS-based external address (dyndns) */
2324 static struct sockaddr_in stunaddr; /*!< stun server address */
2326 /*! \brief List of local networks
2327 * We store "localnet" addresses from the config file into an access list,
2328 * marked as 'DENY', so the call to ast_apply_ha() will return
2329 * AST_SENSE_DENY for 'local' addresses, and AST_SENSE_ALLOW for 'non local'
2330 * (i.e. presumably public) addresses.
2332 static struct ast_ha *localaddr; /*!< List of local networks, on the same side of NAT as this Asterisk */
2334 static int ourport_tcp; /*!< The port used for TCP connections */
2335 static int ourport_tls; /*!< The port used for TCP/TLS connections */
2336 static struct sockaddr_in debugaddr;
2338 static struct ast_config *notify_types; /*!< The list of manual NOTIFY types we know how to send */
2340 /*! some list management macros. */
2342 #define UNLINK(element, head, prev) do { \
2344 (prev)->next = (element)->next; \
2346 (head) = (element)->next; \
2349 enum t38_action_flag {
2350 SDP_T38_NONE = 0, /*!< Do not modify T38 information at all */
2351 SDP_T38_INITIATE, /*!< Remote side has requested T38 with us */
2352 SDP_T38_ACCEPT, /*!< Remote side accepted our T38 request */
2355 /*---------------------------- Forward declarations of functions in chan_sip.c */
2356 /* Note: This is added to help splitting up chan_sip.c into several files
2357 in coming releases. */
2359 /*--- PBX interface functions */
2360 static struct ast_channel *sip_request_call(const char *type, int format, const struct ast_channel *requestor, void *data, int *cause);
2361 static int sip_devicestate(void *data);
2362 static int sip_sendtext(struct ast_channel *ast, const char *text);
2363 static int sip_call(struct ast_channel *ast, char *dest, int timeout);
2364 static int sip_sendhtml(struct ast_channel *chan, int subclass, const char *data, int datalen);
2365 static int sip_hangup(struct ast_channel *ast);
2366 static int sip_answer(struct ast_channel *ast);
2367 static struct ast_frame *sip_read(struct ast_channel *ast);
2368 static int sip_write(struct ast_channel *ast, struct ast_frame *frame);
2369 static int sip_indicate(struct ast_channel *ast, int condition, const void *data, size_t datalen);
2370 static int sip_transfer(struct ast_channel *ast, const char *dest);
2371 static int sip_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
2372 static int sip_senddigit_begin(struct ast_channel *ast, char digit);
2373 static int sip_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration);
2374 static int sip_setoption(struct ast_channel *chan, int option, void *data, int datalen);
2375 static int sip_queryoption(struct ast_channel *chan, int option, void *data, int *datalen);
2376 static const char *sip_get_callid(struct ast_channel *chan);
2378 static int handle_request_do(struct sip_request *req, struct sockaddr_in *sin);
2379 static int sip_standard_port(enum sip_transport type, int port);
2380 static int sip_prepare_socket(struct sip_pvt *p);
2381 static int sip_parse_host(char *line, int lineno, char **hostname, int *portnum, enum sip_transport *transport);
2383 /*--- Transmitting responses and requests */
2384 static int sipsock_read(int *id, int fd, short events, void *ignore);
2385 static int __sip_xmit(struct sip_pvt *p, struct ast_str *data, int len);
2386 static int __sip_reliable_xmit(struct sip_pvt *p, int seqno, int resp, struct ast_str *data, int len, int fatal, int sipmethod);
2387 static int __transmit_response(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
2388 static int retrans_pkt(const void *data);
2389 static int transmit_response_using_temp(ast_string_field callid, struct sockaddr_in *sin, int useglobal_nat, const int intended_method, const struct sip_request *req, const char *msg);
2390 static int transmit_response(struct sip_pvt *p, const char *msg, const struct sip_request *req);
2391 static int transmit_response_reliable(struct sip_pvt *p, const char *msg, const struct sip_request *req);
2392 static int transmit_response_with_date(struct sip_pvt *p, const char *msg, const struct sip_request *req);
2393 static int transmit_response_with_sdp(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable, int oldsdp, int rpid);
2394 static int transmit_response_with_unsupported(struct sip_pvt *p, const char *msg, const struct sip_request *req, const char *unsupported);
2395 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);
2396 static int transmit_provisional_response(struct sip_pvt *p, const char *msg, const struct sip_request *req, int with_sdp);
2397 static int transmit_response_with_allow(struct sip_pvt *p, const char *msg, const struct sip_request *req, enum xmittype reliable);
2398 static void transmit_fake_auth_response(struct sip_pvt *p, int sipmethod, struct sip_request *req, enum xmittype reliable);
2399 static int transmit_request(struct sip_pvt *p, int sipmethod, int inc, enum xmittype reliable, int newbranch);
2400 static int transmit_request_with_auth(struct sip_pvt *p, int sipmethod, int seqno, enum xmittype reliable, int newbranch);
2401 static int transmit_invite(struct sip_pvt *p, int sipmethod, int sdp, int init);
2402 static int transmit_reinvite_with_sdp(struct sip_pvt *p, int t38version, int oldsdp);
2403 static int transmit_info_with_digit(struct sip_pvt *p, const char digit, unsigned int duration);
2404 static int transmit_info_with_vidupdate(struct sip_pvt *p);
2405 static int transmit_message_with_text(struct sip_pvt *p, const char *text);
2406 static int transmit_refer(struct sip_pvt *p, const char *dest);
2407 static int transmit_notify_with_mwi(struct sip_pvt *p, int newmsgs, int oldmsgs, const char *vmexten);
2408 static int transmit_notify_with_sipfrag(struct sip_pvt *p, int cseq, char *message, int terminate);
2409 static int transmit_notify_custom(struct sip_pvt *p, struct ast_variable *vars);
2410 static int transmit_register(struct sip_registry *r, int sipmethod, const char *auth, const char *authheader);
2411 static int send_response(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno);
2412 static int send_request(struct sip_pvt *p, struct sip_request *req, enum xmittype reliable, int seqno);
2413 static void copy_request(struct sip_request *dst, const struct sip_request *src);
2414 static void receive_message(struct sip_pvt *p, struct sip_request *req);
2415 static void parse_moved_contact(struct sip_pvt *p, struct sip_request *req, char **name, char **number, int set_call_forward);
2416 static int sip_send_mwi_to_peer(struct sip_peer *peer, const struct ast_event *event, int cache_only);
2418 /*--- Dialog management */
2419 static struct sip_pvt *sip_alloc(ast_string_field callid, struct sockaddr_in *sin,
2420 int useglobal_nat, const int intended_method, struct sip_request *req);
2421 static int __sip_autodestruct(const void *data);
2422 static void sip_scheddestroy(struct sip_pvt *p, int ms);
2423 static int sip_cancel_destroy(struct sip_pvt *p);
2424 static struct sip_pvt *sip_destroy(struct sip_pvt *p);
2425 static void *dialog_unlink_all(struct sip_pvt *dialog, int lockowner, int lockdialoglist);
2426 static void *registry_unref(struct sip_registry *reg, char *tag);
2427 static void __sip_destroy(struct sip_pvt *p, int lockowner, int lockdialoglist);
2428 static int __sip_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod);
2429 static void __sip_pretend_ack(struct sip_pvt *p);
2430 static int __sip_semi_ack(struct sip_pvt *p, int seqno, int resp, int sipmethod);
2431 static int auto_congest(const void *arg);
2432 static int update_call_counter(struct sip_pvt *fup, int event);
2433 static int hangup_sip2cause(int cause);
2434 static const char *hangup_cause2sip(int cause);
2435 static struct sip_pvt *find_call(struct sip_request *req, struct sockaddr_in *sin, const int intended_method);
2436 static void free_old_route(struct sip_route *route);
2437 static void list_route(struct sip_route *route);
2438 static void build_route(struct sip_pvt *p, struct sip_request *req, int backwards);
2439 static enum check_auth_result register_verify(struct sip_pvt *p, struct sockaddr_in *sin,
2440 struct sip_request *req, const char *uri);
2441 static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag);
2442 static void check_pendings(struct sip_pvt *p);
2443 static void *sip_park_thread(void *stuff);
2444 static int sip_park(struct ast_channel *chan1, struct ast_channel *chan2, struct sip_request *req, int seqno);
2445 static int sip_sipredirect(struct sip_pvt *p, const char *dest);
2446 static int is_method_allowed(unsigned int *allowed_methods, enum sipmethod method);
2448 /*--- Codec handling / SDP */
2449 static void try_suggested_sip_codec(struct sip_pvt *p);
2450 static const char* get_sdp_iterate(int* start, struct sip_request *req, const char *name);
2451 static const char *get_sdp(struct sip_request *req, const char *name);
2452 static int find_sdp(struct sip_request *req);
2453 static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action);
2454 static void add_codec_to_sdp(const struct sip_pvt *p, int codec,
2455 struct ast_str **m_buf, struct ast_str **a_buf,
2456 int debug, int *min_packet_size);
2457 static void add_noncodec_to_sdp(const struct sip_pvt *p, int format,
2458 struct ast_str **m_buf, struct ast_str **a_buf,
2460 static enum sip_result add_sdp(struct sip_request *resp, struct sip_pvt *p, int oldsdp, int add_audio, int add_t38);
2461 static void do_setnat(struct sip_pvt *p);
2462 static void stop_media_flows(struct sip_pvt *p);
2464 /*--- Authentication stuff */
2465 static int reply_digest(struct sip_pvt *p, struct sip_request *req, char *header, int sipmethod, char *digest, int digest_len);
2466 static int build_reply_digest(struct sip_pvt *p, int method, char *digest, int digest_len);
2467 static enum check_auth_result check_auth(struct sip_pvt *p, struct sip_request *req, const char *username,
2468 const char *secret, const char *md5secret, int sipmethod,
2469 const char *uri, enum xmittype reliable, int ignore);
2470 static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_request *req,
2471 int sipmethod, const char *uri, enum xmittype reliable,
2472 struct sockaddr_in *sin, struct sip_peer **authpeer);
2473 static int check_user(struct sip_pvt *p, struct sip_request *req, int sipmethod, const char *uri, enum xmittype reliable, struct sockaddr_in *sin);
2475 /*--- Domain handling */
2476 static int check_sip_domain(const char *domain, char *context, size_t len); /* Check if domain is one of our local domains */
2477 static int add_sip_domain(const char *domain, const enum domain_mode mode, const char *context);
2478 static void clear_sip_domains(void);
2480 /*--- SIP realm authentication */
2481 static struct sip_auth *add_realm_authentication(struct sip_auth *authlist, const char *configuration, int lineno);
2482 static int clear_realm_authentication(struct sip_auth *authlist); /* Clear realm authentication list (at reload) */
2483 static struct sip_auth *find_realm_authentication(struct sip_auth *authlist, const char *realm);
2485 /*--- Misc functions */
2486 static void check_rtp_timeout(struct sip_pvt *dialog, time_t t);
2487 static int sip_do_reload(enum channelreloadreason reason);
2488 static int reload_config(enum channelreloadreason reason);
2489 static int expire_register(const void *data);
2490 static void *do_monitor(void *data);
2491 static int restart_monitor(void);
2492 static void peer_mailboxes_to_str(struct ast_str **mailbox_str, struct sip_peer *peer);
2493 static struct ast_variable *copy_vars(struct ast_variable *src);
2494 /* static int sip_addrcmp(char *name, struct sockaddr_in *sin); Support for peer matching */
2495 static int sip_refer_allocate(struct sip_pvt *p);
2496 static void ast_quiet_chan(struct ast_channel *chan);
2497 static int attempt_transfer(struct sip_dual *transferer, struct sip_dual *target);
2498 static int do_magic_pickup(struct ast_channel *channel, const char *extension, const char *context);
2502 /*--- Device monitoring and Device/extension state/event handling */
2503 static int cb_extensionstate(char *context, char* exten, int state, void *data);
2504 static int sip_devicestate(void *data);
2505 static int sip_poke_noanswer(const void *data);
2506 static int sip_poke_peer(struct sip_peer *peer, int force);
2507 static void sip_poke_all_peers(void);
2508 static void sip_peer_hold(struct sip_pvt *p, int hold);
2509 static void mwi_event_cb(const struct ast_event *, void *);
2511 /*--- Applications, functions, CLI and manager command helpers */
2512 static const char *sip_nat_mode(const struct sip_pvt *p);
2513 static char *sip_show_inuse(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2514 static char *transfermode2str(enum transfermodes mode) attribute_const;
2515 static int peer_status(struct sip_peer *peer, char *status, int statuslen);
2516 static char *sip_show_sched(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2517 static char * _sip_show_peers(int fd, int *total, struct mansession *s, const struct message *m, int argc, const char *argv[]);
2518 static char *sip_show_peers(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2519 static char *sip_show_objects(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2520 static void print_group(int fd, ast_group_t group, int crlf);
2521 static const char *dtmfmode2str(int mode) attribute_const;
2522 static int str2dtmfmode(const char *str) attribute_unused;
2523 static const char *insecure2str(int mode) attribute_const;
2524 static void cleanup_stale_contexts(char *new, char *old);
2525 static void print_codec_to_cli(int fd, struct ast_codec_pref *pref);
2526 static const char *domain_mode_to_text(const enum domain_mode mode);
2527 static char *sip_show_domains(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2528 static char *_sip_show_peer(int type, int fd, struct mansession *s, const struct message *m, int argc, const char *argv[]);
2529 static char *sip_show_peer(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2530 static char *_sip_qualify_peer(int type, int fd, struct mansession *s, const struct message *m, int argc, const char *argv[]);
2531 static char *sip_qualify_peer(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2532 static char *sip_show_registry(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2533 static char *sip_unregister(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2534 static char *sip_show_settings(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2535 static char *sip_show_mwi(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2536 static const char *subscription_type2str(enum subscriptiontype subtype) attribute_pure;
2537 static const struct cfsubscription_types *find_subscription_type(enum subscriptiontype subtype);
2538 static char *complete_sip_peer(const char *word, int state, int flags2);
2539 static char *complete_sip_registered_peer(const char *word, int state, int flags2);
2540 static char *complete_sip_show_history(const char *line, const char *word, int pos, int state);
2541 static char *complete_sip_show_peer(const char *line, const char *word, int pos, int state);
2542 static char *complete_sip_unregister(const char *line, const char *word, int pos, int state);
2543 static char *complete_sipnotify(const char *line, const char *word, int pos, int state);
2544 static char *sip_show_channel(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2545 static char *sip_show_channelstats(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2546 static char *sip_show_history(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2547 static char *sip_do_debug_ip(int fd, const char *arg);
2548 static char *sip_do_debug_peer(int fd, const char *arg);
2549 static char *sip_do_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2550 static char *sip_cli_notify(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2551 static char *sip_set_history(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2552 static int sip_dtmfmode(struct ast_channel *chan, const char *data);
2553 static int sip_addheader(struct ast_channel *chan, const char *data);
2554 static int sip_do_reload(enum channelreloadreason reason);
2555 static char *sip_reload(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2556 static int acf_channel_read(struct ast_channel *chan, const char *funcname, char *preparse, char *buf, size_t buflen);
2559 Functions for enabling debug per IP or fully, or enabling history logging for
2562 static void sip_dump_history(struct sip_pvt *dialog); /* Dump history to debuglog at end of dialog, before destroying data */
2563 static inline int sip_debug_test_addr(const struct sockaddr_in *addr);
2564 static inline int sip_debug_test_pvt(struct sip_pvt *p);
2565 static void append_history_full(struct sip_pvt *p, const char *fmt, ...);
2566 static void sip_dump_history(struct sip_pvt *dialog);
2568 /*--- Device object handling */
2569 static struct sip_peer *build_peer(const char *name, struct ast_variable *v, struct ast_variable *alt, int realtime);
2570 static int update_call_counter(struct sip_pvt *fup, int event);
2571 static void sip_destroy_peer(struct sip_peer *peer);
2572 static void sip_destroy_peer_fn(void *peer);
2573 static void set_peer_defaults(struct sip_peer *peer);
2574 static struct sip_peer *temp_peer(const char *name);
2575 static void register_peer_exten(struct sip_peer *peer, int onoff);
2576 static struct sip_peer *find_peer(const char *peer, struct sockaddr_in *sin, int realtime, int forcenamematch, int devstate_only, int transport);
2577 static int sip_poke_peer_s(const void *data);
2578 static enum parse_register_result parse_register_contact(struct sip_pvt *pvt, struct sip_peer *p, struct sip_request *req);
2579 static void reg_source_db(struct sip_peer *peer);
2580 static void destroy_association(struct sip_peer *peer);
2581 static void set_insecure_flags(struct ast_flags *flags, const char *value, int lineno);
2582 static int handle_common_options(struct ast_flags *flags, struct ast_flags *mask, struct ast_variable *v);
2583 static void set_socket_transport(struct sip_socket *socket, int transport);
2585 /* Realtime device support */
2586 static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, const char *username, const char *fullcontact, const char *useragent, int expirey, unsigned short deprecated_username, int lastms);
2587 static void update_peer(struct sip_peer *p, int expire);
2588 static struct ast_variable *get_insecure_variable_from_config(struct ast_config *config);
2589 static const char *get_name_from_variable(struct ast_variable *var, const char *newpeername);
2590 static struct sip_peer *realtime_peer(const char *peername, struct sockaddr_in *sin, int devstate_only);
2591 static char *sip_prune_realtime(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
2593 /*--- Internal UA client handling (outbound registrations) */
2594 static void ast_sip_ouraddrfor(struct in_addr *them, struct sockaddr_in *us, struct sip_pvt *p);
2595 static void sip_registry_destroy(struct sip_registry *reg);
2596 static int sip_register(const char *value, int lineno);
2597 static const char *regstate2str(enum sipregistrystate regstate) attribute_const;
2598 static int sip_reregister(const void *data);
2599 static int __sip_do_register(struct sip_registry *r);
2600 static int sip_reg_timeout(const void *data);
2601 static void sip_send_all_registers(void);
2602 static int sip_reinvite_retry(const void *data);
2604 /*--- Parsing SIP requests and responses */
2605 static void append_date(struct sip_request *req); /* Append date to SIP packet */
2606 static int determine_firstline_parts(struct sip_request *req);
2607 static const struct cfsubscription_types *find_subscription_type(enum subscriptiontype subtype);
2608 static const char *gettag(const struct sip_request *req, const char *header, char *tagbuf, int tagbufsize);
2609 static int find_sip_method(const char *msg);
2610 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported);
2611 static unsigned int parse_allowed_methods(struct sip_request *req);
2612 static unsigned int set_pvt_allowed_methods(struct sip_pvt *pvt, struct sip_request *req);
2613 static int parse_request(struct sip_request *req);
2614 static const char *get_header(const struct sip_request *req, const char *name);
2615 static const char *referstatus2str(enum referstatus rstatus) attribute_pure;
2616 static int method_match(enum sipmethod id, const char *name);
2617 static void parse_copy(struct sip_request *dst, const struct sip_request *src);
2618 static char *get_in_brackets(char *tmp);
2619 static const char *find_alias(const char *name, const char *_default);
2620 static const char *__get_header(const struct sip_request *req, const char *name, int *start);
2621 static int lws2sws(char *msgbuf, int len);
2622 static void extract_uri(struct sip_pvt *p, struct sip_request *req);
2623 static char *remove_uri_parameters(char *uri);
2624 static int get_refer_info(struct sip_pvt *transferer, struct sip_request *outgoing_req);
2625 static int get_also_info(struct sip_pvt *p, struct sip_request *oreq);
2626 static int parse_ok_contact(struct sip_pvt *pvt, struct sip_request *req);
2627 static int set_address_from_contact(struct sip_pvt *pvt);
2628 static void check_via(struct sip_pvt *p, struct sip_request *req);
2629 static char *get_calleridname(const char *input, char *output, size_t outputsize);
2630 static int get_rpid(struct sip_pvt *p, struct sip_request *oreq);
2631 static int get_rdnis(struct sip_pvt *p, struct sip_request *oreq, char **name, char **number, int *reason);
2632 static int get_destination(struct sip_pvt *p, struct sip_request *oreq);
2633 static int get_msg_text(char *buf, int len, struct sip_request *req, int addnewline);
2634 static int transmit_state_notify(struct sip_pvt *p, int state, int full, int timeout);
2635 static void update_connectedline(struct sip_pvt *p, const void *data, size_t datalen);
2636 static void update_redirecting(struct sip_pvt *p, const void *data, size_t datalen);
2637 static void change_redirecting_information(struct sip_pvt *p, struct sip_request *req, struct ast_party_redirecting *redirecting, int set_call_forward);
2638 static int get_domain(const char *str, char *domain, int len);
2639 static void get_realm(struct sip_pvt *p, const struct sip_request *req);
2641 /*-- TCP connection handling ---*/
2642 static void *_sip_tcp_helper_thread(struct sip_pvt *pvt, struct ast_tcptls_session_instance *tcptls_session);
2643 static void *sip_tcp_worker_fn(void *);
2645 /*--- Constructing requests and responses */
2646 static void initialize_initreq(struct sip_pvt *p, struct sip_request *req);
2647 static int init_req(struct sip_request *req, int sipmethod, const char *recip);
2648 static int reqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod, int seqno, int newbranch);
2649 static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod);
2650 static int init_resp(struct sip_request *resp, const char *msg);
2651 static inline int resp_needs_contact(const char *msg, enum sipmethod method);
2652 static int respprep(struct sip_request *resp, struct sip_pvt *p, const char *msg, const struct sip_request *req);
2653 static const struct sockaddr_in *sip_real_dst(const struct sip_pvt *p);
2654 static void build_via(struct sip_pvt *p);
2655 static int create_addr_from_peer(struct sip_pvt *r, struct sip_peer *peer);
2656 static int create_addr(struct sip_pvt *dialog, const char *opeer, struct sockaddr_in *sin, int newdialog);
2657 static char *generate_random_string(char *buf, size_t size);
2658 static void build_callid_pvt(struct sip_pvt *pvt);
2659 static void build_callid_registry(struct sip_registry *reg, struct in_addr ourip, const char *fromdomain);
2660 static void make_our_tag(char *tagbuf, size_t len);
2661 static int add_header(struct sip_request *req, const char *var, const char *value);
2662 static int add_header_contentLength(struct sip_request *req, int len);
2663 static int add_line(struct sip_request *req, const char *line);
2664 static int add_text(struct sip_request *req, const char *text);
2665 static int add_digit(struct sip_request *req, char digit, unsigned int duration, int mode);
2666 static int add_rpid(struct sip_request *req, struct sip_pvt *p);
2667 static int add_vidupdate(struct sip_request *req);
2668 static void add_route(struct sip_request *req, struct sip_route *route);
2669 static int copy_header(struct sip_request *req, const struct sip_request *orig, const char *field);
2670 static int copy_all_header(struct sip_request *req, const struct sip_request *orig, const char *field);
2671 static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, const struct sip_request *orig, const char *field);
2672 static void set_destination(struct sip_pvt *p, char *uri);
2673 static void append_date(struct sip_request *req);
2674 static void build_contact(struct sip_pvt *p);
2676 /*------Request handling functions */
2677 static int handle_incoming(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int *recount, int *nounlock);
2678 static int handle_request_update(struct sip_pvt *p, struct sip_request *req);
2679 static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int debug, int seqno, struct sockaddr_in *sin, int *recount, const char *e, int *nounlock);
2680 static int handle_request_refer(struct sip_pvt *p, struct sip_request *req, int debug, int seqno, int *nounlock);
2681 static int handle_request_bye(struct sip_pvt *p, struct sip_request *req);
2682 static int handle_request_register(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, const char *e);
2683 static int handle_request_cancel(struct sip_pvt *p, struct sip_request *req);
2684 static int handle_request_message(struct sip_pvt *p, struct sip_request *req);
2685 static int handle_request_subscribe(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int seqno, const char *e);
2686 static void handle_request_info(struct sip_pvt *p, struct sip_request *req);
2687 static int handle_request_options(struct sip_pvt *p, struct sip_request *req);
2688 static int handle_invite_replaces(struct sip_pvt *p, struct sip_request *req, int debug, int seqno, struct sockaddr_in *sin);
2689 static int handle_request_notify(struct sip_pvt *p, struct sip_request *req, struct sockaddr_in *sin, int seqno, const char *e);
2690 static int local_attended_transfer(struct sip_pvt *transferer, struct sip_dual *current, struct sip_request *req, int seqno);
2692 /*------Response handling functions */
2693 static void handle_response_invite(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2694 static void handle_response_notify(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2695 static void handle_response_refer(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2696 static void handle_response_subscribe(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2697 static int handle_response_register(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2698 static void handle_response(struct sip_pvt *p, int resp, const char *rest, struct sip_request *req, int seqno);
2700 /*------ T38 Support --------- */
2701 static int transmit_response_with_t38_sdp(struct sip_pvt *p, char *msg, struct sip_request *req, int retrans);
2702 static struct ast_udptl *sip_get_udptl_peer(struct ast_channel *chan);
2703 static int sip_set_udptl_peer(struct ast_channel *chan, struct ast_udptl *udptl);
2704 static void change_t38_state(struct sip_pvt *p, int state);
2706 /*------ Session-Timers functions --------- */
2707 static void proc_422_rsp(struct sip_pvt *p, struct sip_request *rsp);
2708 static int proc_session_timer(const void *vp);
2709 static void stop_session_timer(struct sip_pvt *p);
2710 static void start_session_timer(struct sip_pvt *p);
2711 static void restart_session_timer(struct sip_pvt *p);
2712 static const char *strefresher2str(enum st_refresher r);
2713 static int parse_session_expires(const char *p_hdrval, int *const p_interval, enum st_refresher *const p_ref);
2714 static int parse_minse(const char *p_hdrval, int *const p_interval);
2715 static int st_get_se(struct sip_pvt *, int max);
2716 static enum st_refresher st_get_refresher(struct sip_pvt *);
2717 static enum st_mode st_get_mode(struct sip_pvt *);
2718 static struct sip_st_dlg* sip_st_alloc(struct sip_pvt *const p);
2720 /*------- RTP Glue functions -------- */
2721 static int sip_set_rtp_peer(struct ast_channel *chan, struct ast_rtp_instance *instance, struct ast_rtp_instance *vinstance, struct ast_rtp_instance *tinstance, int codecs, int nat_active);
2723 /*!--- SIP MWI Subscription support */
2724 static int sip_subscribe_mwi(const char *value, int lineno);
2725 static void sip_subscribe_mwi_destroy(struct sip_subscription_mwi *mwi);
2726 static void sip_send_all_mwi_subscriptions(void);
2727 static int sip_subscribe_mwi_do(const void *data);
2728 static int __sip_subscribe_mwi_do(struct sip_subscription_mwi *mwi);
2730 /*! \brief Definition of this channel for PBX channel registration */
2731 static const struct ast_channel_tech sip_tech = {
2733 .description = "Session Initiation Protocol (SIP)",
2734 .capabilities = AST_FORMAT_AUDIO_MASK, /* all audio formats */
2735 .properties = AST_CHAN_TP_WANTSJITTER | AST_CHAN_TP_CREATESJITTER,
2736 .requester = sip_request_call, /* called with chan unlocked */
2737 .devicestate = sip_devicestate, /* called with chan unlocked (not chan-specific) */
2738 .call = sip_call, /* called with chan locked */
2739 .send_html = sip_sendhtml,
2740 .hangup = sip_hangup, /* called with chan locked */
2741 .answer = sip_answer, /* called with chan locked */
2742 .read = sip_read, /* called with chan locked */
2743 .write = sip_write, /* called with chan locked */
2744 .write_video = sip_write, /* called with chan locked */
2745 .write_text = sip_write,
2746 .indicate = sip_indicate, /* called with chan locked */
2747 .transfer = sip_transfer, /* called with chan locked */
2748 .fixup = sip_fixup, /* called with chan locked */
2749 .send_digit_begin = sip_senddigit_begin, /* called with chan unlocked */
2750 .send_digit_end = sip_senddigit_end,
2751 .bridge = ast_rtp_instance_bridge, /* XXX chan unlocked ? */
2752 .early_bridge = ast_rtp_instance_early_bridge,
2753 .send_text = sip_sendtext, /* called with chan locked */
2754 .func_channel_read = acf_channel_read,
2755 .setoption = sip_setoption,
2756 .queryoption = sip_queryoption,
2757 .get_pvt_uniqueid = sip_get_callid,
2760 /*! \brief This version of the sip channel tech has no send_digit_begin
2761 * callback so that the core knows that the channel does not want
2762 * DTMF BEGIN frames.
2763 * The struct is initialized just before registering the channel driver,
2764 * and is for use with channels using SIP INFO DTMF.
2766 static struct ast_channel_tech sip_tech_info;
2769 /*! \brief Working TLS connection configuration */
2770 static struct ast_tls_config sip_tls_cfg;
2772 /*! \brief Default TLS connection configuration */
2773 static struct ast_tls_config default_tls_cfg;
2775 /*! \brief The TCP server definition */
2776 static struct ast_tcptls_session_args sip_tcp_desc = {
2778 .master = AST_PTHREADT_NULL,
2781 .name = "SIP TCP server",
2782 .accept_fn = ast_tcptls_server_root,
2783 .worker_fn = sip_tcp_worker_fn,
2786 /*! \brief The TCP/TLS server definition */
2787 static struct ast_tcptls_session_args sip_tls_desc = {
2789 .master = AST_PTHREADT_NULL,
2790 .tls_cfg = &sip_tls_cfg,
2792 .name = "SIP TLS server",
2793 .accept_fn = ast_tcptls_server_root,
2794 .worker_fn = sip_tcp_worker_fn,
2797 /* wrapper macro to tell whether t points to one of the sip_tech descriptors */
2798 #define IS_SIP_TECH(t) ((t) == &sip_tech || (t) == &sip_tech_info)
2800 /*! \brief Append to SIP dialog history
2801 \return Always returns 0 */
2802 #define append_history(p, event, fmt , args... ) append_history_full(p, "%-15s " fmt, event, ## args)
2804 /*! \brief map from an integer value to a string.
2805 * If no match is found, return errorstring
2807 static const char *map_x_s(const struct _map_x_s *table, int x, const char *errorstring)
2809 const struct _map_x_s *cur;
2811 for (cur = table; cur->s; cur++)
2817 /*! \brief map from a string to an integer value, case insensitive.
2818 * If no match is found, return errorvalue.
2820 static int map_s_x(const struct _map_x_s *table, const char *s, int errorvalue)
2822 const struct _map_x_s *cur;
2824 for (cur = table; cur->s; cur++)
2825 if (!strcasecmp(cur->s, s))
2831 * \brief generic function for determining if a correct transport is being
2832 * used to contact a peer
2834 * this is done as a macro so that the "tmpl" var can be passed either a
2835 * sip_request or a sip_peer
2837 #define check_request_transport(peer, tmpl) ({ \
2839 if (peer->socket.type == tmpl->socket.type) \
2841 else if (!(peer->transports & tmpl->socket.type)) {\
2842 ast_log(LOG_ERROR, \
2843 "'%s' is not a valid transport for '%s'. we only use '%s'! ending call.\n", \
2844 get_transport(tmpl->socket.type), peer->name, get_transport_list(peer->transports) \
2847 } else if (peer->socket.type & SIP_TRANSPORT_TLS) { \
2848 ast_log(LOG_WARNING, \
2849 "peer '%s' HAS NOT USED (OR SWITCHED TO) TLS in favor of '%s' (but this was allowed in sip.conf)!\n", \
2850 peer->name, get_transport(tmpl->socket.type) \
2854 "peer '%s' has contacted us over %s even though we prefer %s.\n", \
2855 peer->name, get_transport(tmpl->socket.type), get_transport(peer->socket.type) \
2862 * duplicate a list of channel variables, \return the copy.
2864 static struct ast_variable *copy_vars(struct ast_variable *src)
2866 struct ast_variable *res = NULL, *tmp, *v = NULL;
2868 for (v = src ; v ; v = v->next) {
2869 if ((tmp = ast_variable_new(v->name, v->value, v->file))) {
2877 /*! \brief SIP TCP connection handler */
2878 static void *sip_tcp_worker_fn(void *data)
2880 struct ast_tcptls_session_instance *tcptls_session = data;
2882 return _sip_tcp_helper_thread(NULL, tcptls_session);
2885 /*! \brief SIP TCP thread management function
2886 This function reads from the socket, parses the packet into a request
2888 static void *_sip_tcp_helper_thread(struct sip_pvt *pvt, struct ast_tcptls_session_instance *tcptls_session)
2891 struct sip_request req = { 0, } , reqcpy = { 0, };
2892 struct sip_threadinfo *me;
2893 char buf[1024] = "";
2895 me = ast_calloc(1, sizeof(*me));
2900 me->threadid = pthread_self();
2901 me->tcptls_session = tcptls_session;
2902 if (tcptls_session->ssl)
2903 me->type = SIP_TRANSPORT_TLS;
2905 me->type = SIP_TRANSPORT_TCP;
2907 ast_debug(2, "Starting thread for %s server\n", tcptls_session->ssl ? "SSL" : "TCP");
2909 AST_LIST_LOCK(&threadl);
2910 AST_LIST_INSERT_TAIL(&threadl, me, list);
2911 AST_LIST_UNLOCK(&threadl);
2913 if (!(req.data = ast_str_create(SIP_MIN_PACKET)))
2915 if (!(reqcpy.data = ast_str_create(SIP_MIN_PACKET)))
2919 struct ast_str *str_save;
2921 str_save = req.data;
2922 memset(&req, 0, sizeof(req));
2923 req.data = str_save;
2924 ast_str_reset(req.data);
2926 str_save = reqcpy.data;
2927 memset(&reqcpy, 0, sizeof(reqcpy));
2928 reqcpy.data = str_save;
2929 ast_str_reset(reqcpy.data);
2931 memset(buf, 0, sizeof(buf));
2933 if (tcptls_session->ssl) {
2934 set_socket_transport(&req.socket, SIP_TRANSPORT_TLS);
2935 req.socket.port = htons(ourport_tls);
2937 set_socket_transport(&req.socket, SIP_TRANSPORT_TCP);
2938 req.socket.port = htons(ourport_tcp);
2940 req.socket.fd = tcptls_session->fd;
2941 res = ast_wait_for_input(tcptls_session->fd, -1);
2943 ast_debug(2, "SIP %s server :: ast_wait_for_input returned %d\n", tcptls_session->ssl ? "SSL": "TCP", res);
2947 /* Read in headers one line at a time */
2948 while (req.len < 4 || strncmp(REQ_OFFSET_TO_STR(&req, len - 4), "\r\n\r\n", 4)) {
2949 ast_mutex_lock(&tcptls_session->lock);
2950 if (!fgets(buf, sizeof(buf), tcptls_session->f)) {
2951 ast_mutex_unlock(&tcptls_session->lock);
2954 ast_mutex_unlock(&tcptls_session->lock);
2957 ast_str_append(&req.data, 0, "%s", buf);
2958 req.len = req.data->used;
2960 copy_request(&reqcpy, &req);
2961 parse_request(&reqcpy);
2962 /* In order to know how much to read, we need the content-length header */
2963 if (sscanf(get_header(&reqcpy, "Content-Length"), "%30d", &cl)) {
2965 ast_mutex_lock(&tcptls_session->lock);
2966 if (!fread(buf, (cl < sizeof(buf)) ? cl : sizeof(buf), 1, tcptls_session->f)) {
2967 ast_mutex_unlock(&tcptls_session->lock);
2970 ast_mutex_unlock(&tcptls_session->lock);
2974 ast_str_append(&req.data, 0, "%s", buf);
2975 req.len = req.data->used;
2978 /*! \todo XXX If there's no Content-Length or if the content-length and what
2979 we receive is not the same - we should generate an error */
2981 req.socket.tcptls_session = tcptls_session;
2982 handle_request_do(&req, &tcptls_session->remote_address);
2986 AST_LIST_LOCK(&threadl);
2987 AST_LIST_REMOVE(&threadl, me, list);
2988 AST_LIST_UNLOCK(&threadl);
2991 fclose(tcptls_session->f);
2992 tcptls_session->f = NULL;
2993 tcptls_session->fd = -1;
2995 ast_free(reqcpy.data);
3003 ast_debug(2, "Shutting down thread for %s server\n", tcptls_session->ssl ? "SSL" : "TCP");
3006 ao2_ref(tcptls_session, -1);
3007 tcptls_session = NULL;
3014 * helper functions to unreference various types of objects.
3015 * By handling them this way, we don't have to declare the
3016 * destructor on each call, which removes the chance of errors.
3018 static void *unref_peer(struct sip_peer *peer, char *tag)
3020 ao2_t_ref(peer, -1, tag);
3024 static struct sip_peer *ref_peer(struct sip_peer *peer, char *tag)
3026 ao2_t_ref(peer, 1, tag);
3030 /*! \brief maintain proper refcounts for a sip_pvt's outboundproxy
3032 * This function sets pvt's outboundproxy pointer to the one referenced
3033 * by the proxy parameter. Because proxy may be a refcounted object, and
3034 * because pvt's old outboundproxy may also be a refcounted object, we need
3035 * to maintain the proper refcounts.
3037 * \param pvt The sip_pvt for which we wish to set the outboundproxy
3038 * \param proxy The sip_proxy which we will point pvt towards.
3039 * \return Returns void
3041 static void ref_proxy(struct sip_pvt *pvt, struct sip_proxy *proxy)
3043 struct sip_proxy *old_obproxy = pvt->outboundproxy;
3044 /* The sip_cfg.outboundproxy is statically allocated, and so
3045 * we don't ever need to adjust refcounts for it
3047 if (proxy && proxy != &sip_cfg.outboundproxy) {
3050 pvt->outboundproxy = proxy;
3051 if (old_obproxy && old_obproxy != &sip_cfg.outboundproxy) {
3052 ao2_ref(old_obproxy, -1);
3057 * \brief Unlink a dialog from the dialogs container, as well as any other places
3058 * that it may be currently stored.
3060 * \note A reference to the dialog must be held before calling this function, and this
3061 * function does not release that reference.
3063 static void *dialog_unlink_all(struct sip_pvt *dialog, int lockowner, int lockdialoglist)
3067 dialog_ref(dialog, "Let's bump the count in the unlink so it doesn't accidentally become dead before we are done");
3069 ao2_t_unlink(dialogs, dialog, "unlinking dialog via ao2_unlink");
3071 /* Unlink us from the owner (channel) if we have one */
3072 if (dialog->owner) {
3074 ast_channel_lock(dialog->owner);
3075 ast_debug(1, "Detaching from channel %s\n", dialog->owner->name);
3076 dialog->owner->tech_pvt = dialog_unref(dialog->owner->tech_pvt, "resetting channel dialog ptr in unlink_all");
3078 ast_channel_unlock(dialog->owner);
3080 if (dialog->registry) {
3081 if (dialog->registry->call == dialog)
3082 dialog->registry->call = dialog_unref(dialog->registry->call, "nulling out the registry's call dialog field in unlink_all");
3083 dialog->registry = registry_unref(dialog->registry, "delete dialog->registry");
3085 if (dialog->stateid > -1) {
3086 ast_extension_state_del(dialog->stateid, NULL);
3087 dialog_unref(dialog, "removing extension_state, should unref the associated dialog ptr that was stored there.");
3088 dialog->stateid = -1; /* shouldn't we 'zero' this out? */
3090 /* Remove link from peer to subscription of MWI */
3091 if (dialog->relatedpeer && dialog->relatedpeer->mwipvt == dialog)
3092 dialog->relatedpeer->mwipvt = dialog_unref(dialog->relatedpeer->mwipvt, "delete ->relatedpeer->mwipvt");
3093 if (dialog->relatedpeer && dialog->relatedpeer->call == dialog)
3094 dialog->relatedpeer->call = dialog_unref(dialog->relatedpeer->call, "unset the relatedpeer->call field in tandem with relatedpeer field itself");
3096 /* remove all current packets in this dialog */
3097 while((cp = dialog->packets)) {
3098 dialog->packets = dialog->packets->next;
3099 AST_SCHED_DEL(sched, cp->retransid);
3100 dialog_unref(cp->owner, "remove all current packets in this dialog, and the pointer to the dialog too as part of __sip_destroy");
3107 AST_SCHED_DEL_UNREF(sched, dialog->waitid, dialog_unref(dialog, "when you delete the waitid sched, you should dec the refcount for the stored dialog ptr"));
3109 AST_SCHED_DEL_UNREF(sched, dialog->initid, dialog_unref(dialog, "when you delete the initid sched, you should dec the refcount for the stored dialog ptr"));
3111 if (dialog->autokillid > -1)
3112 AST_SCHED_DEL_UNREF(sched, dialog->autokillid, dialog_unref(dialog, "when you delete the autokillid sched, you should dec the refcount for the stored dialog ptr"));
3114 if (dialog->request_queue_sched_id > -1) {
3115 AST_SCHED_DEL_UNREF(sched, dialog->request_queue_sched_id, dialog_unref(dialog, "when you delete the request_queue_sched_id sched, you should dec the refcount for the stored dialog ptr"));
3118 AST_SCHED_DEL_UNREF(sched, dialog->provisional_keepalive_sched_id, dialog_unref(dialog, "when you delete the provisional_keepalive_sched_id, you should dec the refcount for the stored dialog ptr"));
3120 if (dialog->t38id > -1) {
3121 AST_SCHED_DEL_UNREF(sched, dialog->t38id, dialog_unref(dialog, "when you delete the t38id sched, you should dec the refcount for the stored dialog ptr"));
3124 dialog_unref(dialog, "Let's unbump the count in the unlink so the poor pvt can disappear if it is time");
3128 static void *registry_unref(struct sip_registry *reg, char *tag)
3130 ast_debug(3, "SIP Registry %s: refcount now %d\n", reg->hostname, reg->refcount - 1);
3131 ASTOBJ_UNREF(reg, sip_registry_destroy);
3135 /*! \brief Add object reference to SIP registry */
3136 static struct sip_registry *registry_addref(struct sip_registry *reg, char *tag)
3138 ast_debug(3, "SIP Registry %s: refcount now %d\n", reg->hostname, reg->refcount + 1);
3139 return ASTOBJ_REF(reg); /* Add pointer to registry in packet */
3142 /*! \brief Interface structure with callbacks used to connect to UDPTL module*/
3143 static struct ast_udptl_protocol sip_udptl = {
3145 get_udptl_info: sip_get_udptl_peer,
3146 set_udptl_peer: sip_set_udptl_peer,
3149 static void append_history_full(struct sip_pvt *p, const char *fmt, ...)
3150 __attribute__((format(printf, 2, 3)));
3153 /*! \brief Convert transfer status to string */
3154 static const char *referstatus2str(enum referstatus rstatus)
3156 return map_x_s(referstatusstrings, rstatus, "");
3159 static inline void pvt_set_needdestroy(struct sip_pvt *pvt, const char *reason)
3161 append_history(pvt, "NeedDestroy", "Setting needdestroy because %s", reason);
3162 pvt->needdestroy = 1;
3165 /*! \brief Initialize the initital request packet in the pvt structure.
3166 This packet is used for creating replies and future requests in
3168 static void initialize_initreq(struct sip_pvt *p, struct sip_request *req)
3170 if (p->initreq.headers)
3171 ast_debug(1, "Initializing already initialized SIP dialog %s (presumably reinvite)\n", p->callid);
3173 ast_debug(1, "Initializing initreq for method %s - callid %s\n", sip_methods[req->method].text, p->callid);
3174 /* Use this as the basis */
3175 copy_request(&p->initreq, req);
3176 parse_request(&p->initreq);
3178 ast_verbose("Initreq: %d headers, %d lines\n", p->initreq.headers, p->initreq.lines);
3181 /*! \brief Encapsulate setting of SIP_ALREADYGONE to be able to trace it with debugging */
3182 static void sip_alreadygone(struct sip_pvt *dialog)
3184 ast_debug(3, "Setting SIP_ALREADYGONE on dialog %s\n", dialog->callid);
3185 dialog->alreadygone = 1;
3188 /*! Resolve DNS srv name or host name in a sip_proxy structure */
3189 static int proxy_update(struct sip_proxy *proxy)
3191 /* if it's actually an IP address and not a name,
3192 there's no need for a managed lookup */
3193 if (!inet_aton(proxy->name, &proxy->ip.sin_addr)) {
3194 /* Ok, not an IP address, then let's check if it's a domain or host */
3195 /* XXX Todo - if we have proxy port, don't do SRV */
3196 if (ast_get_ip_or_srv(&proxy->ip, proxy->name, sip_cfg.srvlookup ? "_sip._udp" : NULL) < 0) {
3197 ast_log(LOG_WARNING, "Unable to locate host '%s'\n", proxy->name);
3201 proxy->last_dnsupdate = time(NULL);
3205 /*! \brief converts ascii port to int representation. If no
3206 * pt buffer is provided or the pt has errors when being converted
3207 * to an int value, the port provided as the standard is used.
3209 static int port_str2int(const char *pt, unsigned int standard)
3211 int port = standard;
3212 if (ast_strlen_zero(pt) || (sscanf(pt, "%30d", &port) != 1) || (port < 0)) {
3219 /*! \brief Allocate and initialize sip proxy */
3220 static struct sip_proxy *proxy_allocate(char *name, char *port, int force)
3222 struct sip_proxy *proxy;
3224 if (ast_strlen_zero(name)) {
3228 proxy = ao2_alloc(sizeof(*proxy), NULL);
3231 proxy->force = force;
3232 ast_copy_string(proxy->name, name, sizeof(proxy->name));
3233 proxy->ip.sin_port = htons(port_str2int(port, STANDARD_SIP_PORT));
3234 proxy_update(proxy);
3238 /*! \brief Get default outbound proxy or global proxy */
3239 static struct sip_proxy *obproxy_get(struct sip_pvt *dialog, struct sip_peer *peer)
3241 if (peer && peer->outboundproxy) {
3243 ast_debug(1, "OBPROXY: Applying peer OBproxy to this call\n");
3244 append_history(dialog, "OBproxy", "Using peer obproxy %s", peer->outboundproxy->name);
3245 return peer->outboundproxy;
3247 if (sip_cfg.outboundproxy.name[0]) {
3249 ast_debug(1, "OBPROXY: Applying global OBproxy to this call\n");
3250 append_history(dialog, "OBproxy", "Using global obproxy %s", sip_cfg.outboundproxy.name);
3251 return &sip_cfg.outboundproxy;
3254 ast_debug(1, "OBPROXY: Not applying OBproxy to this call\n");
3258 /*! \brief returns true if 'name' (with optional trailing whitespace)
3259 * matches the sip method 'id'.
3260 * Strictly speaking, SIP methods are case SENSITIVE, but we do
3261 * a case-insensitive comparison to be more tolerant.
3262 * following Jon Postel's rule: Be gentle in what you accept, strict with what you send
3264 static int method_match(enum sipmethod id, const char *name)
3266 int len = strlen(sip_methods[id].text);
3267 int l_name = name ? strlen(name) : 0;
3268 /* true if the string is long enough, and ends with whitespace, and matches */
3269 return (l_name >= len && name[len] < 33 &&
3270 !strncasecmp(sip_methods[id].text, name, len));
3273 /*! \brief find_sip_method: Find SIP method from header */
3274 static int find_sip_method(const char *msg)
3278 if (ast_strlen_zero(msg))
3280 for (i = 1; i < ARRAY_LEN(sip_methods) && !res; i++) {
3281 if (method_match(i, msg))
3282 res = sip_methods[i].id;
3287 /*! \brief Parse supported header in incoming packet */
3288 static unsigned int parse_sip_options(struct sip_pvt *pvt, const char *supported)
3292 unsigned int profile = 0;
3295 if (ast_strlen_zero(supported) )
3297 temp = ast_strdupa(supported);
3300 ast_debug(3, "Begin: parsing SIP \"Supported: %s\"\n", supported);
3302 for (next = temp; next; next = sep) {
3304 if ( (sep = strchr(next, ',')) != NULL)
3306 next = ast_skip_blanks(next);
3308 ast_debug(3, "Found SIP option: -%s-\n", next);
3309 for (i = 0; i < ARRAY_LEN(sip_options); i++) {
3310 if (!strcasecmp(next, sip_options[i].text)) {
3311 profile |= sip_options[i].id;
3314 ast_debug(3, "Matched SIP option: %s\n", next);
3319 /* This function is used to parse both Suported: and Require: headers.
3320 Let the caller of this function know that an unknown option tag was
3321 encountered, so that if the UAC requires it then the request can be
3322 rejected with a 420 response. */
3324 profile |= SIP_OPT_UNKNOWN;
3326 if (!found && sipdebug) {
3327 if (!strncasecmp(next, "x-", 2))
3328 ast_debug(3, "Found private SIP option, not supported: %s\n", next);
3330 ast_debug(3, "Found no match for SIP option: %s (Please file bug report!)\n", next);
3335 pvt->sipoptions = profile;
3339 /*! \brief See if we pass debug IP filter */
3340 static inline int sip_debug_test_addr(const struct sockaddr_in *addr)
3344 if (debugaddr.sin_addr.s_addr) {
3345 if (((ntohs(debugaddr.sin_port) != 0)
3346 && (debugaddr.sin_port != addr->sin_port))
3347 || (debugaddr.sin_addr.s_addr != addr->sin_addr.s_addr))
3353 /*! \brief The real destination address for a write */
3354 static const struct sockaddr_in *sip_real_dst(const struct sip_pvt *p)
3356 if (p->outboundproxy)
3357 return &p->outboundproxy->ip;
3359 return ast_test_flag(&p->flags[0], SIP_NAT_FORCE_RPORT) || ast_test_flag(&p->flags[0], SIP_NAT_RPORT_PRESENT) ? &p->recv : &p->sa;
3362 /*! \brief Display SIP nat mode */
3363 static const char *sip_nat_mode(const struct sip_pvt *p)
3365 return ast_test_flag(&p->flags[0], SIP_NAT_FORCE_RPORT) ? "NAT" : "no NAT";
3368 /*! \brief Test PVT for debugging output */
3369 static inline int sip_debug_test_pvt(struct sip_pvt *p)
3373 return sip_debug_test_addr(sip_real_dst(p));
3376 /*! \brief Return int representing a bit field of transport types found in const char *transport */
3377 static int get_transport_str2enum(const char *transport)