nua_register.c 55.2 KB
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/*
 * This file is part of the Sofia-SIP package
 *
 * Copyright (C) 2006 Nokia Corporation.
 *
 * Contact: Pekka Pessi <pekka.pessi@nokia.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

/**@CFILE nua_register.c
 * @brief REGISTER and registrations
 *
 * @author Pekka Pessi <Pekka.Pessi@nokia.com>
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 * @author Martti Mela <Martti.Mela@nokia.com>
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 *
 * @date Created: Wed Mar  8 11:48:49 EET 2006 ppessi
 */

#include "config.h"

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/** @internal SU network changed detector argument pointer type */
#define SU_NETWORK_CHANGED_MAGIC_T struct nua_s

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#include <sofia-sip/string0.h>
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#include <sofia-sip/su_strlst.h>
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#include <sofia-sip/su_uniqueid.h>
#include <sofia-sip/su_tagarg.h>

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#include <sofia-sip/sip_protos.h>
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#include <sofia-sip/sip_util.h>
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#include <sofia-sip/sip_status.h>
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#define NTA_LEG_MAGIC_T      struct nua_handle_s
#define NTA_OUTGOING_MAGIC_T struct nua_handle_s
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#define NTA_UPDATE_MAGIC_T   struct nua_s
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#include "nua_stack.h"
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#include <sofia-sip/hostdomain.h>
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#include <sofia-sip/nta_tport.h>
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#include <sofia-sip/tport.h>
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#include <sofia-sip/tport_tag.h>
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#define OUTBOUND_OWNER_T struct nua_handle_s

#include "outbound.h"

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#if HAVE_SIGCOMP
#include <sigcomp.h>
#endif

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#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

#include <assert.h>

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/* ======================================================================== */
/* Registrations and contacts */
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int nua_registration_from_via(nua_registration_t **list,
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			      nua_handle_t *nh, 
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			      sip_via_t const *via,
			      int public);
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int nua_registration_add(nua_registration_t **list, nua_registration_t *nr);
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void nua_registration_remove(nua_registration_t *nr);
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int nua_registration_set_aor(su_home_t *, nua_registration_t *nr,
			     sip_from_t const *aor);
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int nua_registration_set_contact(nua_handle_t *,
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				 nua_registration_t *nr,
				 sip_contact_t const *m,
				 int terminating);

void nua_registration_set_ready(nua_registration_t *nr, int ready);

/* ====================================================================== */
/* REGISTER usage */

static char const *nua_register_usage_name(nua_dialog_usage_t const *du);

static int nua_register_usage_add(nua_handle_t *nh,
				  nua_dialog_state_t *ds,
				  nua_dialog_usage_t *du);
static void nua_register_usage_remove(nua_handle_t *nh,
				      nua_dialog_state_t *ds,
				      nua_dialog_usage_t *du);
static void nua_register_usage_peer_info(nua_dialog_usage_t *du,
					 nua_dialog_state_t const *ds,
					 sip_t const *sip);
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static void nua_register_usage_refresh(nua_handle_t *,
				       nua_dialog_state_t *,
				       nua_dialog_usage_t *,
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				       sip_time_t);
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static int nua_register_usage_shutdown(nua_handle_t *,
				       nua_dialog_state_t *,
				       nua_dialog_usage_t *);
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/** REGISTER usage, aka nua_registration_t */
struct register_usage {
  nua_registration_t *nr_next, **nr_prev, **nr_list; /* Doubly linked list and its head */
  sip_from_t *nr_aor;		/**< AoR for this registration, NULL if none */
  sip_contact_t *nr_contact;	/**< Our Contact */
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  sip_via_t *nr_via;		/**< Corresponding Via headers */
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  /** Status of registration */
  unsigned nr_ready:1;
  /** Kind of registration.
   *
   * If nr_default is true, this is not a real registration but placeholder
   * for Contact header derived from a transport address.
   *
   * If nr_secure is true, this registration supports SIPS/TLS.
   *
   * If nr_public is true, transport should have public address.
   */
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  unsigned nr_default:1, nr_secure:1, nr_public:1, nr_ip4:1, nr_ip6:1;
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  /** Stack-generated contact */
  unsigned nr_by_stack:1, :0;
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  sip_route_t *nr_route;	/**< Outgoing Service-Route */
  sip_path_t *nr_path;		/**< Incoming Path */
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  tport_t *nr_tport;		/**< Transport to be used when registered */
  nua_dialog_state_t *nr_dialogs; /**< List of our dialogs */
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#if HAVE_SIGCOMP
  struct sigcomp_compartment *nr_compartment;
#endif
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  outbound_t *nr_ob;	/**< Outbound connection */
};
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nua_usage_class const nua_register_usage[1] = {
  {
    sizeof (struct register_usage),
    (sizeof nua_register_usage),
    nua_register_usage_add,
    nua_register_usage_remove,
    nua_register_usage_name,
    nua_register_usage_peer_info,
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    nua_register_usage_refresh,
    nua_register_usage_shutdown
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  }};
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static char const *nua_register_usage_name(nua_dialog_usage_t const *du)
{
  return "register";
}
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static int nua_register_usage_add(nua_handle_t *nh,
				  nua_dialog_state_t *ds,
				  nua_dialog_usage_t *du)
{
  nua_registration_t *nr = nua_dialog_usage_private(du);
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  if (ds->ds_has_register)
    return -1;			/* There can be only one usage */
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  ds->ds_has_register = 1;
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  nr->nr_public = 1;		/* */
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  return 0;
}
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static void nua_register_usage_remove(nua_handle_t *nh,
				      nua_dialog_state_t *ds,
				      nua_dialog_usage_t *du)
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{
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  nua_registration_t *nr = nua_dialog_usage_private(du);
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  if (nr->nr_list)
    nua_registration_remove(nr);	/* Remove from list of registrations */

  if (nr->nr_ob)
    outbound_unref(nr->nr_ob);
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#if HAVE_SIGCOMP
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  if (nr->nr_compartment)
    sigcomp_compartment_unref(nr->nr_compartment);
  nr->nr_compartment = NULL;
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#endif
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  ds->ds_has_register = 0;	/* There can be only one */
}


/** @internal Store information about registrar. */
static void nua_register_usage_peer_info(nua_dialog_usage_t *du,
					 nua_dialog_state_t const *ds,
					 sip_t const *sip)
{
  nua_registration_t *nr = nua_dialog_usage_private(du);
  if (nr->nr_ob)
    outbound_peer_info(nr->nr_ob, sip);
}
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/* ======================================================================== */
/* REGISTER */

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static void restart_register(nua_handle_t *nh, tagi_t *tags);
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static int process_response_to_register(nua_handle_t *nh,
					nta_outgoing_t *orq,
					sip_t const *sip);

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static void unregister_expires_contacts(msg_t *msg, sip_t *sip);

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/* Interface towards outbound_t */
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sip_contact_t *nua_handle_contact_by_via(nua_handle_t *nh,
					 su_home_t *home,
					 char const *extra_username,
					 sip_via_t const *v,
					 char const *transport,
					 char const *m_param,
					 ...);

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static int nua_stack_outbound_features(nua_handle_t *nh, outbound_t *ob);

static int nua_stack_outbound_refresh(nua_handle_t *,
				      outbound_t *ob);
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static int nua_stack_outbound_status(nua_handle_t *,
				     outbound_t *ob,
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				     int status, char const *phrase,
				     tag_type_t tag, tag_value_t value, ...);

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static int nua_stack_outbound_failed(nua_handle_t *,
				     outbound_t *ob,
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				     int status, char const *phrase,
				     tag_type_t tag, tag_value_t value, ...);

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static int nua_stack_outbound_credentials(nua_handle_t *, auth_client_t **auc);
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outbound_owner_vtable nua_stack_outbound_callbacks = {
    sizeof nua_stack_outbound_callbacks,
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    nua_handle_contact_by_via,
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    nua_stack_outbound_refresh,
    nua_stack_outbound_status,
    nua_stack_outbound_failed,
    nua_stack_outbound_failed,
    nua_stack_outbound_credentials
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  };

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/**@fn void nua_register(nua_handle_t *nh, tag_type_t tag, tag_value_t value, ...);
 * 
 * Send SIP REGISTER request to the registrar. 
 *
 * Request status will be delivered to the application using #nua_r_register
 * event. When successful the registration will be updated periodically.
 *
 * The handle used for registration cannot be used for any other purposes.
 *
 * @param nh              Pointer to operation handle
 * @param tag, value, ... List of tagged parameters
 *
 * @return
 *     nothing
 *
 * @par Related tags:
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 *     NUTAG_REGISTRAR(), NUTAG_INSTANCE(), NUTAG_OUTBOUND(),
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 *     NUTAG_KEEPALIVE(), NUTAG_KEEPALIVE_STREAM(), NUTAG_M_USERNAME(),
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 *     NUTAG_M_DISPLAY(), NUTAG_M_PARAMS(), NUTAG_M_FEATURES(), 
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 *
 * @par Events:
 *     #nua_r_register, #nua_i_outbound
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 * 
 * @par Generating Contact Header
 *
 * If the application did not specify the Contact header in the tags,
 * nua_register() will generate one. It will obtain the schema, IP address
 * for the host and port number for the Contact URI from the transport
 * socket. The diplay name is taken from NUTAG_M_DISPLAY(), URL username
 * part is taken from NUTAG_M_USERNAME(), URI parameters from
 * NUTAG_M_PARAMS(), and Contact header parameters from NUTAG_M_FEATURES(). 
 * If NUTAG_CALLEE_CAPS(1) is specified, additional Contact header
 * parameters are generated based on SDP capabilities and SIP @Allow header.
 * 
 * Note that @b nua may append a identifier of its own to the @Contact URI
 * username. Such nua-generated identifier trailer always starts with "="
 * (equal sign), rest of the nua-generated identifier may contain any
 * url-unreserved characters except "=".
 *
 * Likewise, nua may add transport parameters (such as "transport=tcp" or
 * "maddr") to the @Contact URI. It can add addtional header parameters, like
 * "+sip.instance" or "reg-id", too.
 *
 * For instance, if application uses tags like
 * @code
 *   nua_register(nh,
 *                NUTAG_M_DISPLAY("1"),
 *                NUTAG_M_USERNAME("line-1"),
 *                NUTAG_M_PARAMS("user=phone"),
 *                NUTAG_M_FEATURES("audio"),
 *                NUTAG_CALLEE_CAPS(0),
 *                TAG_END())
 * @endcode
 * @b nua can generate a Contact header like
 * @code
 * Contact: 1 <sip:line-1=SSQAIbjv@192.168.1.200;transport=tcp;user=phone>
 *   ;audio;reg-id=1
 *   ;+sip.instance=urn:uuid:97701ad9-39df-1229-1083-dbc0a85f029c
 * @endcode
 *
 * The incoming request from the proxy should contain the registered contact
 * URI as the request URI. The application can use the username prefix set
 * by NUTAG_M_USERNAME() and the non-transport parameters of the request URI
 * set by NUTAG_M_PARAMS() when determining to which registration the
 * incoming request belongs.
 * 
 * For example, a request line correspoding to the @Contact in above example
 * may look like:
 * @code
 * INVITE sip:line-1=SSQAIbjv@192.168.1.200;user=phone SIP/2.0
 * @endcode
 *
 * @sa NUTAG_M_DISPLAY(), NUTAG_M_USERNAME(), NUTAG_M_PARAMS(),
 * NUTAG_M_FEATURES(), NUTAG_CALLEE_CAPS().
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 *
 * @par NAT, Firewall and Outbound Support
 *
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 * Normally, @b nua will start start a protocol engine for outbound
 * connections used for NAT and firewall traversal and connectivity checks
 * when registering. 
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 *
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 * @note If the application provides @b nua with a
 * @Contact header of its own (or includes a SIPTAG_CONTACT(NULL) tag in
 * nua_register() tags), the outbound protocol engine is not started. It is
 * assumed that the application knows better what it is doing when it sets
 * the @Contact, or it is using experimental CPL upload as specified in 
 * <a href="http://www.ietf.org/internet-drafts/draft-lennox-sip-reg-payload-01.txt">
 * draft-lennox-sip-reg-payload-01.txt</a>.
 *
 * First, outbound engine will probe for NATs in between UA and registrar. 
 * It will send a REGISTER request as usual. Upon receiving the response it
 * checks for the presence of "received" and "rport" parameters in the Via
 * header returned by registrar. The presence of NAT is determined from the
 * "received" parameter in a Via header. When a REGISTER request was sent,
 * the stack inserted the actual source IP address in the Via header: if
 * that is different from the source IP address seen by the registrar, the
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 * registrar inserts the source IP address it sees into the "received"
 * parameter.
 *
 * Please note that an ALG (application-level gateway) modifying the Via
 * headers in outbound requests and again in incoming responses will make
 * the above-described NAT check to fail.
 *
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 * The response to the initial REGISTER should also include option tags
 * indicating whether registrar supports various SIP extension options: @e
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 * outbound, @e pref, @e path, @e gruu.
 *
 * Basically, @e outbound means that instead of registering its contact URI
 * with a particular address-of-record URI, the user-agent registers a
 * transport-level connection. Such a connection is identified on the
 * Contact header field with an instance identifier, application-provided
 * @ref NUTAG_INSTANCE() "unique string" identifying the user-agent instance
 * and a stack-generated numeric index identifying the transport-level
 * connection.
 *
 * If the @e outbound extension is supported, NUTAG_OUTBOUND() contains
 * option string "outbound" and the application has provided an instance
 * identifer to the stack with NUTAG_INSTANCE(), the nua_register() will try
 * to use outbound.
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 *
 * If @e outbound is not supported, nua_register() has to generate a URI
 * that can be used to reach it from outside. It will check for public
 * transport addresses detected by underlying stack with, e.g., STUN, UPnP
 * or SOCKS. If there are public addresses, nua_register() will use them. If
 * there is no public address, it will try to generate a Contact URI from
 * the "received" and "rport" parameters found in the Via header of the
 * response message.
 *
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 * @todo Actually generate public addresses.
 *
 * You can disable this kind of NAT traversal by setting "no-natify" into
 * NUTAG_OUTBOUND() options string.
 * 
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 * @par GRUU and Service-Route
 *
 * After a successful response to the REGISTER request has been received,
 * nua_register() will update the information about the registration based
 * on it. If there is a "gruu" parameter included in the response,
 * nua_register() will save it and use the gruu URI in the Contact header
 * fields of dialog-establishing messages, such as INVITE or SUBSCRIBE. 
 * Also, if the registrar has included a Service-Route header in the
 * response, and the service route feature has not been disabled using
 * NUTAG_SERVICE_ROUTE_ENABLE(), the route URIs from the Service-Route
 * header will be used for initial non-REGISTER requests.
 *
 * The #nua_r_register message will include the contact header and route
 * used in with the registration.
 *
 * @par Registration Keep-Alive
 *
 * After the registration has successfully completed the nua_register() will
 * validate the registration and initiate the keepalive mechanism, too. The
 * user-agent validates the registration by sending a OPTIONS requests to
 * itself. If there is an error, nua_register() will indicate that to the
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 * application using #nua_i_outbound event, and start unregistration
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 * procedure (unless that has been explicitly disabled).
 *
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 * You can disable validation by inserting "no-validate" into
 * NUTAG_OUTBOUND() string.
 *
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 * The keepalive mechanism depends on the network features detected earlier. 
 * If @a outbound extension is used, the STUN keepalives will be used. 
 * Otherwise, NUA stack will repeatedly send OPTIONS requests to itself. In
 * order to save bandwidth, it will include Max-Forwards: 0 in the
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 * keep-alive requests, however. The keepalive interval is determined by
 * NUTAG_KEEPALIVE() parameter. If the interval is 0, no keepalive messages
 * is sent.
 *
 * You can disable keepalive OPTIONS by inserting "no-options-keepalive"
 * into NUTAG_OUTBOUND() string. Currently there are no other keepalive
 * mechanisms available.
 *
 * The value of NUTAG_KEEPALIVE_STREAM(), if specified, is used to indicate
 * the desired transport-layer keepalive interval for stream-based
 * transports like TLS and TCP.
 *
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 * @sa #nua_r_register, nua_unregister(), #nua_r_unregister, 
 * #nua_i_register,
 * @RFC3261 section 10,
 * @Expires, @Contact, @CallID, @CSeq,
 * @Path, @RFC3327, @ServiceRoute, @RFC3608, @RFC3680,
 *     NUTAG_REGISTRAR(), NUTAG_INSTANCE(), NUTAG_OUTBOUND(),
 *     NUTAG_KEEPALIVE(), NUTAG_KEEPALIVE_STREAM(), 
 *     SIPTAG_CONTACT(), SIPTAG_CONTACT_STR(), NUTAG_M_USERNAME(),
 *     NUTAG_M_DISPLAY(), NUTAG_M_PARAMS(), NUTAG_M_FEATURES(), 
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 */

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/** @NUA_EVENT nua_r_register
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 *
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 * Response to an outgoing REGISTER.
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 *
 * The REGISTER may be sent explicitly by nua_register() or implicitly by
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 * NUA state machines. 
 * 
 * When REGISTER request has been restarted the @a status may be 100 even
 * while the real response status returned is different.
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 *
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 * @param status response status code
 *               (if the request is retried, @a status is 100, the @a
 *               sip->sip_status->st_status contain the real status code
 *               from the response message, e.g., 302, 401, or 407)
 * @param phrase a short textual description of @a status code
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 * @param nh     operation handle associated with the registration
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 * @param hmagic application context associated with the registration
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 * @param sip    response message to REGISTER request or NULL upon an error
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 *               (status code is in @a status and 
 *                descriptive message in @a phrase parameters)
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 * @param tags   empty
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 *
 * @sa nua_register(), nua_unregister(), #nua_r_unregister,
 * @Contact, @CallID, @CSeq, @RFC3261 section 10,
 * @Path, @RFC3327, @ServiceRoute, @RFC3608, @RFC3680
 * 
 * @END_NUA_EVENT
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 */

/**@fn void nua_unregister(nua_handle_t *nh, tag_type_t tag, tag_value_t value, ...);
 * Unregister. 
 *
 * Send a REGISTER request with expiration time 0. This removes the 
 * registration from the registrar. If the handle was earlier used 
 * with nua_register() the periodic updates will be terminated. 
 *
 * If a SIPTAG_CONTACT_STR() with argument "*" is used, all the
 * registrations will be removed from the registrar otherwise only the
 * contact address belonging to the NUA stack is removed.
 *
 * @param nh              Pointer to operation handle
 * @param tag, value, ... List of tagged parameters
 *
 * @return
 *     nothing
 *
 * @par Related tags:
 *     NUTAG_REGISTRAR() \n
 *     Tags in <sip_tag.h> except SIPTAG_EXPIRES() or SIPTAG_EXPIRES_STR()
 *
 * @par Events:
 *     #nua_r_unregister
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 *
 * @sa nua_register(), #nua_r_register, nua_handle_destroy(), nua_shutdown(),
 * #nua_i_register,
 * @Expires, @Contact, @CallID, @CSeq, @RFC3261 section 10,
 * @Path, @RFC3327, @ServiceRoute, @RFC3608, @RFC3680,
 *     NUTAG_REGISTRAR(), NUTAG_INSTANCE(), NUTAG_OUTBOUND(),
 *     NUTAG_KEEPALIVE(), NUTAG_KEEPALIVE_STREAM(), 
 *     SIPTAG_CONTACT(), SIPTAG_CONTACT_STR(), NUTAG_M_USERNAME(),
 *     NUTAG_M_DISPLAY(), NUTAG_M_PARAMS(), NUTAG_M_FEATURES(), 
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 */

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/** @NUA_EVENT nua_r_unregister
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 *
 * Answer to outgoing un-REGISTER.
 *
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 * @param status response status code
 *               (if the request is retried, @a status is 100, the @a
 *               sip->sip_status->st_status contain the real status code
 *               from the response message, e.g., 302, 401, or 407)
 * @param phrase a short textual description of @a status code
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 * @param nh     operation handle associated with the registration
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 * @param hmagic application context associated with the registration
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 * @param sip    response message to REGISTER request or NULL upon an error
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 *               (status code is in @a status and 
 *                descriptive message in @a phrase parameters)
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 * @param tags   empty
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 *
 * @sa nua_unregister(), nua_register(), #nua_r_register,
 * @Contact, @CallID, @CSeq, @RFC3261 section 10,
 * @Path, @RFC3327, @ServiceRoute, @RFC3608, @RFC3680
 * 
 * @END_NUA_EVENT
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 */

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int
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nua_stack_register(nua_t *nua, nua_handle_t *nh, nua_event_t e,
		   tagi_t const *tags)
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{
  nua_dialog_usage_t *du;
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  nua_registration_t *nr = NULL;
  outbound_t *ob = NULL;
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  nua_client_request_t *cr = nh->nh_ds->ds_cr;
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  msg_t *msg = NULL;
  sip_t *sip;
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  int terminating = e != nua_r_register;
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  if (nua_stack_set_handle_special(nh, nh_has_register, nua_r_register) < 0)
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    return UA_EVENT2(e, 900, "Invalid handle for REGISTER");
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  if (cr->cr_orq)
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    return UA_EVENT2(e, 900, "Request already in progress");
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  nua_stack_init_handle(nua, nh, TAG_NEXT(tags));
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  du = nua_dialog_usage_add(nh, nh->nh_ds, nua_register_usage, NULL);
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  if (!du)
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    return UA_EVENT1(e, NUA_INTERNAL_ERROR);
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  nr = nua_dialog_usage_private(du); assert(nr);
  nua_registration_add(&nh->nh_nua->nua_registrations, nr);
  if (!terminating && du->du_terminating)
    return UA_EVENT2(e, 900, "Unregister in progress");
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  if (cr->cr_msg)
    msg_destroy(cr->cr_msg), cr->cr_msg = NULL;
  /* Use original message as template when unregistering */
  if (terminating)		
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    cr->cr_msg = msg_ref_create(du->du_msg);
572

573
  msg = nua_creq_msg(nua, nh, cr, cr->cr_msg != NULL,
574
		     SIP_METHOD_REGISTER,
575
		     TAG_IF(!terminating, NUTAG_USE_DIALOG(1)),
576 577
		     TAG_NEXT(tags));
  sip = sip_object(msg);
578 579
  if (!msg || !sip)
    goto error;
580

581 582 583 584
  if (!nr->nr_aor) {
    if (nua_registration_set_aor(nh->nh_home, nr, sip->sip_to) < 0)
      goto error;
  }
585

586 587
  if (du->du_msg == NULL)
    du->du_msg = msg_ref_create(cr->cr_msg); /* Save original message */
588

589 590 591
  if (terminating)
    /* Add Expires: 0 and remove the expire parameters from contacts */
    unregister_expires_contacts(msg, sip);
592

593 594 595 596 597 598 599
  if (nua_tagis_have_contact_tag(tags) ||
      nua_tagis_have_contact_tag(nh->nh_tags)) {
    if (!sip->sip_contact)
      terminating = 1;
  }
  else if (nua_registration_set_contact(nh, nr, sip->sip_contact, terminating)
	   < 0)
600
    goto error;
601 602 603

  du->du_terminating = terminating;

604 605 606 607 608 609 610 611 612
  ob = nr->nr_ob;
  
  if (!ob && (NH_PGET(nh, outbound) || NH_PGET(nh, instance))) {
    nr->nr_ob = ob = outbound_new(nh, &nua_stack_outbound_callbacks,
				  nh->nh_nua->nua_root,
				  nh->nh_nua->nua_nta,
				  NH_PGET(nh, instance));
    if (!ob)
      goto error;
613
  }
614

615 616 617 618 619 620 621 622 623 624
  if (ob) {
    outbound_set_options(ob,
			 NH_PGET(nh, outbound),
			 NH_PGET(nh, keepalive),
			 NH_PISSET(nh, keepalive_stream)
			 ? NH_PGET(nh, keepalive_stream)
			 : NH_PGET(nh, keepalive));
    nua_stack_outbound_features(nh, ob);
    outbound_stop_keepalive(ob);

625
    if (outbound_set_contact(ob, sip->sip_contact, nr->nr_via, terminating) < 0)
626
      goto error;
627 628
  }

629 630 631 632 633 634 635 636 637 638 639 640 641 642
  /* This calls nta_outgoing_mcreate() but adds a few tags */
  cr->cr_orq =
    outbound_register_request(ob, terminating,
			      nr->nr_by_stack ? nr->nr_contact : NULL,
			      nua->nua_nta,
			      process_response_to_register, nh, NULL,
			      msg,
			      SIPTAG_END(), 
			      TAG_IF(terminating, NTATAG_SIGCOMP_CLOSE(1)),
			      TAG_IF(!terminating, NTATAG_COMP("sigcomp")),
			      TAG_NEXT(tags));

  if (!cr->cr_orq)
    goto error;
643

644
  cr->cr_usage = du;
645
  return cr->cr_event = e;
646 647 648 649 650 651

 error:
  msg_destroy(msg);
  msg_destroy(cr->cr_msg), cr->cr_msg = NULL;
  nua_dialog_usage_remove(nh, nh->nh_ds, du);    
  return UA_EVENT1(e, NUA_INTERNAL_ERROR);
652 653 654 655 656
}

static void
restart_register(nua_handle_t *nh, tagi_t *tags)
{
657
  nua_client_request_t *cr = nh->nh_ds->ds_cr;
658
  msg_t *msg;
659
  nua_dialog_usage_t *du = cr->cr_usage;
660 661
  nua_registration_t *nr = nua_dialog_usage_private(du);
  int terminating = du && du->du_terminating;
662 663 664 665 666 667 668

  cr->cr_restart = NULL;

  if (!cr->cr_msg)
    return;

  msg = nua_creq_msg(nh->nh_nua, nh, cr, 1,
669 670 671 672
		     SIP_METHOD_UNKNOWN,
		     TAG_NEXT(tags));

  if (!msg)
673
    return;			/* XXX - Uh-oh */
674

675
  if (terminating)
676
    unregister_expires_contacts(msg, sip_object(msg));
677

678 679 680 681 682 683 684 685 686 687 688 689 690 691 692
  /* This calls nta_outgoing_mcreate() but adds a few tags */
  cr->cr_orq =
    outbound_register_request(nr->nr_ob, terminating,
			      nr->nr_by_stack ? nr->nr_contact : NULL,
			      nh->nh_nua->nua_nta,
			      process_response_to_register, nh, NULL,
			      msg,
			      SIPTAG_END(), 
			      TAG_IF(terminating, NTATAG_SIGCOMP_CLOSE(1)),
			      TAG_IF(!terminating, NTATAG_COMP("sigcomp")),
			      TAG_NEXT(tags));

  if (!cr->cr_orq)
    msg_destroy(msg);
}
693

694 695 696
/** Refresh registration */
static
void nua_register_usage_refresh(nua_handle_t *nh,
697
				nua_dialog_state_t *ds,
698 699
				nua_dialog_usage_t *du,
				sip_time_t now)
700 701
{
  nua_t *nua = nh->nh_nua;
702
  nua_client_request_t *cr = nh->nh_ds->ds_cr;
703 704 705
  nua_registration_t *nr = nua_dialog_usage_private(du);
  msg_t *msg;
  sip_t *sip;
706 707 708

  if (du->du_terminating || du->du_shutdown)
    return;
709

710
  if (cr->cr_msg) {
711 712
    /* Dialog is busy, delay of 5 .. 15 seconds */
    nua_dialog_usage_refresh_range(du, 5, 15);
713
    return;
714
  }
715

716
  outbound_stop_keepalive(nr->nr_ob);
717

718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
  cr->cr_msg = msg_copy(du->du_msg);
  msg = nua_creq_msg(nua, nh, cr, 1,
		     SIP_METHOD_REGISTER,
		     NUTAG_USE_DIALOG(1),
		     TAG_END());
  sip = sip_object(msg);
  if (!msg || !sip)
    goto error;

  cr->cr_orq =
    outbound_register_request(nr->nr_ob, 0,
			      nr->nr_by_stack ? nr->nr_contact : NULL,
			      nh->nh_nua->nua_nta,
			      process_response_to_register, nh, NULL,
			      msg,
			      SIPTAG_END(), 
			      NTATAG_COMP("sigcomp"),
			      TAG_END());
  if (!cr->cr_orq)
    goto error;

  cr->cr_usage = du;
  cr->cr_event = nua_r_register;
  return;

 error:
  msg_destroy(msg);
  msg_destroy(cr->cr_msg);
  UA_EVENT2(nua_r_register, NUA_INTERNAL_ERROR, TAG_END());
  return;
}

/** Shutdown register usage. 
 *
 * Called when stack is shut down or handle is destroyed. Unregister.
 */
static
755 756 757
int nua_register_usage_shutdown(nua_handle_t *nh, 
				nua_dialog_state_t *ds,
				nua_dialog_usage_t *du)
758 759
{
  nua_t *nua = nh->nh_nua;
760
  nua_client_request_t *cr = nh->nh_ds->ds_cr;
761 762 763 764 765 766 767 768 769 770 771
  nua_registration_t *nr = nua_dialog_usage_private(du);
  msg_t *msg;
  sip_t *sip;

  if (du->du_terminating)	/* Already terminating? */
    return 100;

  du->du_terminating = 1;

  if (cr->cr_msg)    /* Busy */
    return 100;
772 773 774

  outbound_stop_keepalive(nr->nr_ob);

775
  cr->cr_msg = msg_copy(du->du_msg);
776 777 778 779 780 781 782 783
  msg = nua_creq_msg(nua, nh, cr, 1,
		     SIP_METHOD_REGISTER,
		     NUTAG_USE_DIALOG(1),
		     TAG_END());
  sip = sip_object(msg);
  if (!msg || !sip)
    goto error;

784
  unregister_expires_contacts(msg, sip);
785 786

  cr->cr_orq =
787
    outbound_register_request(nr->nr_ob, 1,
788 789 790 791 792
			      nr->nr_by_stack ? nr->nr_contact : NULL,
			      nh->nh_nua->nua_nta,
			      process_response_to_register, nh, NULL,
			      msg,
			      SIPTAG_END(), 
793
			      NTATAG_SIGCOMP_CLOSE(1),
794 795 796 797 798
			      TAG_END());
  if (!cr->cr_orq)
    goto error;

  cr->cr_usage = du;
799 800
  cr->cr_event = nua_r_destroy;
  return 200;
801 802

 error:
803
  nua_dialog_usage_remove(nh, nh->nh_ds, du);
804 805
  msg_destroy(msg);
  msg_destroy(cr->cr_msg);
806
  return 500;
807 808
}

809

810 811 812 813 814
static
int process_response_to_register(nua_handle_t *nh,
				 nta_outgoing_t *orq,
				 sip_t const *sip)
{
815
  nua_client_request_t *cr = nh->nh_ds->ds_cr;
816
  nua_dialog_usage_t *du = cr->cr_usage;
817 818
  nua_registration_t *nr = nua_dialog_usage_private(du);
  int status, ready, reregister, terminating;
819
  char const *phrase;
820 821
  msg_t *_reqmsg = nta_outgoing_getrequest(orq);
  sip_t *req = sip_object(_reqmsg); msg_destroy(_reqmsg);
822 823

  assert(sip);
824
  assert(du && du->du_class == nua_register_usage);
825 826 827 828 829 830
  status = sip->sip_status->st_status;
  phrase = sip->sip_status->st_phrase;

  if (status < 200 || !du)
    return nua_stack_process_response(nh, cr, orq, sip, TAG_END());

831 832
  terminating = du->du_terminating;
  if (!terminating)
833
    nua_dialog_store_peer_info(nh, nh->nh_ds, sip);
834

835 836 837 838 839 840
  reregister = outbound_register_response(nr->nr_ob, terminating, req, sip);
  if (reregister < 0)
    SET_STATUS1(NUA_INTERNAL_ERROR);
  else if (reregister >= ob_reregister) {
    /* Save msg otherwise nua_creq_check_restart() will zap it */
    msg_t *msg = msg_ref_create(cr->cr_msg);
841

842 843 844 845
    if (nua_creq_check_restart(nh, cr, orq, sip, restart_register)) {
      msg_destroy(msg);
      return 0;
    }
846

847 848
    assert(cr->cr_msg == NULL);
    cr->cr_msg = msg;
849

850 851 852 853 854 855 856 857 858 859
    if (reregister >= ob_reregister_now) {
      /* We can try to reregister immediately */
      nua_creq_restart_with(nh, cr, orq, 100, "Updated Contact",
			    restart_register,
			    TAG_END());
    }
    else {
      /* Outbound will invoke refresh_register() later */
      nua_creq_save_restart(nh, cr, orq, 100, "Updated Contact",
			    restart_register);
860
    }
861
    return 0;
862
  }
863

864
  if (status >= 300)
865 866
    if (nua_creq_check_restart(nh, cr, orq, sip, restart_register))
      return 0;
867

868 869
  ready = !terminating && status < 300;
  du->du_ready = ready;
870

871 872
  if (status < 300) {
    if (!du->du_terminating) {
873
      sip_time_t mindelta = 0;
874 875
      sip_time_t now = sip_now(), delta, reqdelta;
      sip_contact_t const *m, *sent;
876

877
      /** Search for lowest delta of SIP contacts we tried to register */
878
      mindelta = SIP_TIME_MAX;
879

880
      reqdelta = req->sip_expires ? req->sip_expires->ex_delta : 0;
881

882
      for (m = sip->sip_contact; m; m = m->m_next) {
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901
        if (m->m_url->url_type != url_sip && 
            m->m_url->url_type != url_sips)
          continue;
        for (sent = req->sip_contact; sent; sent = sent->m_next)
          if (url_cmp(m->m_url, sent->m_url) == 0) {
            sip_time_t mdelta = reqdelta;

            if (sent->m_expires)
              mdelta = strtoul(sent->m_expires, NULL, 10);
            if (mdelta == 0)
              mdelta = 3600;

            delta = sip_contact_expires(m, sip->sip_expires, sip->sip_date,
       				 mdelta, now);
            if (delta > 0 && delta < mindelta)
              mindelta = delta;
            if (url_cmp_all(m->m_url, sent->m_url) == 0)
              break;
          }
902 903
      }

904
      if (mindelta == SIP_TIME_MAX)
905
        mindelta = 3600;
906
      nua_dialog_usage_set_expires(du, mindelta);
907
    }
908 909
    else
      nua_dialog_usage_set_expires(du, 0);
910
  }
911 912

#if HAVE_SIGCOMP
913 914 915 916 917
  if (ready) {
    struct sigcomp_compartment *cc;
    cc = nta_outgoing_compartment(orq);
    sigcomp_compartment_unref(nr->nr_compartment);
    nr->nr_compartment = cc;
918
  }
919
#endif
920

921
  /*  RFC 3608 Section 6.1 Procedures at the UA
922 923 924 925 926 927 928 929 930 931 932 933 934 935 936

   The UA performs a registration as usual.  The REGISTER response may
   contain a Service-Route header field.  If so, the UA MAY store the
   value of the Service-Route header field in an association with the
   address-of-record for which the REGISTER transaction had registered a
   contact.  If the UA supports multiple addresses-of-record, it may be
   able to store multiple service routes, one per address-of-record.  If
   the UA refreshes the registration, the stored value of the Service-
   Route is updated according to the Service-Route header field of the
   latest 200 class response.  If there is no Service-Route header field
   in the response, the UA clears any service route for that address-
   of-record previously stored by the UA.  If the re-registration
   request is refused or if an existing registration expires and the UA
   chooses not to re-register, the UA SHOULD discard any stored service
   route for that address-of-record.
937

938
  */
939 940 941
  if (ready) {
    su_free(nh->nh_home, nr->nr_route);
    nr->nr_route = sip_route_dup(nh->nh_home, sip->sip_service_route);
942 943
  }
  else {
944 945
    su_free(nh->nh_home, nr->nr_route);
    nr->nr_route = NULL;
946
  }
947

948 949 950
  if (ready) {
    /* RFC 3327 */
    /* Store last URI in Path header */
951 952
    sip_path_t *path = sip->sip_path;

953
    while (path && path->r_next)
954 955
      path = path->r_next;

956 957 958 959
    if (!nr->nr_path || !path ||
        url_cmp_all(nr->nr_path->r_url, path->r_url)) {
      su_free(nh->nh_home, nr->nr_path);
      nr->nr_path = sip_path_dup(nh->nh_home, path);
960 961 962
    }
  }

963
  if (ready)
964
    if (sip->sip_to->a_url->url_type == url_sips)
965
      nr->nr_secure = 1;
966

967 968 969 970
  if (nr->nr_ob) {
    if (ready) {
      outbound_gruuize(nr->nr_ob, sip);
      outbound_start_keepalive(nr->nr_ob, orq);
971
    }
972 973
    else
      outbound_stop_keepalive(nr->nr_ob);
974 975
  }

976
  nua_registration_set_ready(nr, ready);
977

978
  return nua_stack_process_response(nh, cr, orq, sip, TAG_END());
979
}
980

981
/* ---------------------------------------------------------------------- */
982
/* nua_registration_t interface */
983

984 985 986 987
#if HAVE_SOFIA_STUN
#include <sofia-sip/stun.h>
#endif

988
static void nua_stack_tport_update(nua_t *nua, nta_agent_t *nta);
989 990 991 992 993
static int nua_registration_add_contact_and_route(nua_registration_t *nr,
						  msg_t *msg,
						  sip_t *sip,
						  int add_contact,
						  int add_service_route);
994

995
int
996 997 998 999 1000 1001 1002
nua_stack_init_transport(nua_t *nua, tagi_t const *tags)
{
  url_string_t const *contact1 = NULL, *contact2 = NULL;
  char const *name1 = "sip", *name2 = "sip";
  char const *certificate_dir = NULL;

  tl_gets(tags,
1003 1004 1005 1006
          NUTAG_URL_REF(contact1),
          NUTAG_SIPS_URL_REF(contact2),
          NUTAG_CERTIFICATE_DIR_REF(certificate_dir),
          TAG_END());
1007

1008 1009 1010
  if (!contact1 && contact2)
    contact1 = contact2, contact2 = NULL;

1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
  if (contact1 &&
      (url_is_string(contact1) 
       ? strncasecmp(contact1->us_str, "sips:", 5) == 0
       : contact1->us_url->url_type == url_sips))
    name1 = "sips";

  if (contact2 && 
      (url_is_string(contact2) 
       ? strncasecmp(contact2->us_str, "sips:", 5) == 0
       : contact2->us_url->url_type == url_sips))
    name2 = "sips";

1023
  if (!contact1 /* && !contact2 */) {
1024
    if (nta_agent_add_tport(nua->nua_nta, NULL,
1025 1026 1027
			    TPTAG_IDENT("sip"),
			    TPTAG_CERTIFICATE(certificate_dir),
			    TAG_NEXT(nua->nua_args)) < 0 &&
1028
        nta_agent_add_tport(nua->nua_nta, URL_STRING_MAKE("sip:*:*"),
1029 1030 1031
			    TPTAG_IDENT("sip"),
			    TPTAG_CERTIFICATE(certificate_dir),
			    TAG_NEXT(nua->nua_args)) < 0)
1032
      return -1;
1033
#if HAVE_SOFIA_STUN
1034 1035 1036 1037 1038 1039 1040 1041
    if (stun_is_requested(TAG_NEXT(nua->nua_args)) &&
	nta_agent_add_tport(nua->nua_nta, URL_STRING_MAKE("sip:0.0.0.0:*"),
			    TPTAG_IDENT("stun"),
			    TPTAG_PUBLIC(tport_type_stun), /* use stun */
			    TPTAG_CERTIFICATE(certificate_dir),
			    TAG_NEXT(nua->nua_args)) < 0) {
      SU_DEBUG_0(("nua: error initializing STUN transport\n"));
    }
1042
#endif
1043
  }
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056
  else {
    if (nta_agent_add_tport(nua->nua_nta, contact1,
			    TPTAG_IDENT(name1),
			    TPTAG_CERTIFICATE(certificate_dir),
			    TAG_NEXT(nua->nua_args)) < 0)
      return -1;

    if (contact2 &&
	nta_agent_add_tport(nua->nua_nta, contact2,
			    TPTAG_IDENT(name2),
			    TPTAG_CERTIFICATE(certificate_dir),
			    TAG_NEXT(nua->nua_args)) < 0) 
      return -1;
1057 1058
  }

1059

1060 1061 1062 1063 1064 1065
  if (nua_stack_init_registrations(nua) < 0)
    return -1;

  return 0;
}

1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095
#if 0
  /* Store network detector param value */
  if (agent->sa_nw_updates == 0)
    agent->sa_nw_updates = nw_updates;
 	      NTATAG_DETECT_NETWORK_UPDATES_REF(nw_updates),
  unsigned nw_updates = 0;
  unsigned nw_updates = 0;

  su_network_changed_t *sa_nw_changed;

#endif

static
void nua_network_changed_cb(nua_t *nua, su_root_t *root)
{

  uint32_t nw_updates = NUA_NW_DETECT_TRY_FULL;

  switch (nw_updates) {
  case NUA_NW_DETECT_ONLY_INFO:
    nua_stack_event(nua, NULL, NULL, nua_i_network_changed,
		    SIP_200_OK, TAG_END());

    break;
    
  case NUA_NW_DETECT_TRY_FULL:

    /* 1) Shutdown all tports */
    nta_agent_close_tports(nua->nua_nta);

1096
    /* 2) Create new tports */
1097 1098 1099 1100 1101 1102 1103
    if (nua_stack_init_transport(nua, nua->nua_args) < 0)
      /* We are hosed */
      nua_stack_event(nua, NULL, NULL, nua_i_network_changed,
		      900, "Internal Error", TAG_END());
    else
      nua_stack_event(nua, NULL, NULL, nua_i_network_changed,
		      SIP_200_OK, TAG_END());
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131

    break;
    
  default:
    break;
  }

  return;
}

int nua_stack_launch_network_change_detector(nua_t *nua)
{
  su_network_changed_t *snc = NULL;

  snc = su_root_add_network_changed(nua->nua_home,
				    nua->nua_api_root,
				    nua_network_changed_cb,
				    nua);
  
  if (!snc)
    return -1;

  nua->nua_nw_changed = snc;

  return 0;
}


1132 1133
int
nua_stack_init_registrations(nua_t *nua)
1134 1135
{
  /* Create initial identities: peer-to-peer, public, sips */
1136 1137
  nua_registration_t **nr_list = &nua->nua_registrations, **nr_next;
  nua_handle_t **nh_list;
1138
  nua_handle_t *dnh = nua->nua_dhandle;
1139
  sip_via_t const *v;
1140

1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
  /* Remove existing, local address based registrations and count the
     rest */
  while (nr_list && *nr_list) {
    nr_next = &(*nr_list)->nr_next;
    if ((*nr_list)->nr_default == 1) {
      nua_registration_remove(*nr_list);
      /* memset(*nr_list, 170, sizeof(**nr_list)); */
      /* XXX - free, too */
    }
    nr_list = nr_next;
  }
  nr_list = &nua->nua_registrations;

1154 1155
  v = nta_agent_public_via(nua->nua_nta);
  if (v) {
1156
    nua_registration_from_via(nr_list, dnh, v, 1);
1157
  }
1158

1159 1160
  v = nta_agent_via(nua->nua_nta);
  if (v) {
1161
    nua_registration_from_via(nr_list, dnh, v, 0);
1162
  }
1163 1164
  else {
    sip_via_t v[2];
1165

1166 1167 1168 1169 1170 1171
    sip_via_init(v)->v_next = v + 1;
    v[0].v_protocol = sip_transport_udp;
    v[0].v_host = "addr.is.invalid.";
    sip_via_init(v + 1);
    v[1].v_protocol = sip_transport_tcp;
    v[1].v_host = "addr.is.invalid.";
1172

1173
    nua_registration_from_via(nr_list, dnh, v, 0);
1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
  }

  /* Go through all the registrations and set to refresh almost
     immediately */
  nh_list = &nua->nua_handles;
  for (; *nh_list; nh_list = &(*nh_list)->nh_next) {
    nua_dialog_state_t *ds;
    nua_dialog_usage_t *du;

    ds = (*nh_list)->nh_ds;
    du = ds->ds_usage;

    if (ds->ds_has_register == 1 && du->du_class->usage_refresh) {
1187
      nua_dialog_usage_refresh(*nh_list, ds, du, 1);
1188
    }
1189 1190
  }

1191
  nta_agent_bind_tport_update(nua->nua_nta, nua, nua_stack_tport_update);
1192

1193 1194 1195
  return 0;
}

1196
int nua_registration_from_via(nua_registration_t **list,
1197
			      nua_handle_t *nh,
1198 1199
			      sip_via_t const *via,
			      int public)
1200
{
1201
  su_home_t *home = nh->nh_home;
1202 1203 1204
  sip_via_t *v, *pair, /* v2[2], */ *vias, **vv, **prev;
  nua_registration_t *nr = NULL, **next;
  su_home_t autohome[SU_HOME_AUTO_SIZE(1024)];
1205
  int nr_items = 0;
1206

1207
  vias = sip_via_copy(su_home_auto(autohome, sizeof autohome), via);
1208

1209
  for (; *list; list = &(*list)->nr_next)
1210
    ++nr_items;
1211

1212
  next = list;
1213

1214 1215 1216
  for (vv = &vias; (v = *vv);) {
    char const *protocol;
    sip_contact_t *contact;
1217
    sip_via_t v2[2];
1218

1219
    *vv = v->v_next, v->v_next = NULL, pair = NULL;
1220

1221 1222 1223 1224 1225 1226
    if (v->v_protocol == sip_transport_tcp)
      protocol = sip_transport_udp;
    else if (v->v_protocol == sip_transport_udp)
      protocol = sip_transport_tcp;
    else
      protocol = NULL;
1227

1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238
    if (protocol) {
      /* Try to pair vias if we have both udp and tcp */
      for (prev = vv; *prev; prev = &(*prev)->v_next) {
        if (strcasecmp(protocol, (*prev)->v_protocol))
          continue;
        if (strcasecmp(v->v_host, (*prev)->v_host))
          continue;
        if (str0cmp(v->v_port, (*prev)->v_port))
          continue;
        break;
      }
1239

1240 1241 1242 1243
      if (*prev) {
        pair = *prev; *prev = pair->v_next; pair->v_next = NULL;
      }
    }
1244

1245 1246 1247
    /* if more than one candidate, ignore local entries */
    if (v && (*vv || nr_items > 0) && 
	host_is_local(v->v_host)) {
1248 1249
      SU_DEBUG_9(("nua_register: ignoring contact candidate %s:%s.\n", 
		  v->v_host, v->v_port ? v->v_port : ""));
1250 1251 1252
      continue;
    }
     
1253 1254 1255
    nr = su_zalloc(home, sizeof *nr);
    if (!nr)
      break;
1256

1257
    v2[0] = *v;
1258

1259 1260
    if (pair)
      /* Don't use protocol if we have both udp and tcp */
1261
      protocol = NULL, v2[0].v_next = &v2[1], v2[1] = *pair;
1262
    else
1263
      protocol = via->v_protocol, v2[0].v_next = NULL;
1264

1265
    v2[1].v_next = NULL;
1266

1267 1268 1269 1270 1271 1272 1273 1274
#if 1
    contact = nua_handle_contact_by_via(nh, home, NULL, v2, protocol, NULL);
#else
    contact = sip_contact_create_from_via_with_transport(home, v2, NULL, protocol);
#endif
    v = sip_via_dup(home, v2);

    if (!contact || !v) {
1275 1276 1277
      su_free(home, nr);
      break;
    }
1278

1279 1280 1281
    nr->nr_ready = 1, nr->nr_default = 1, nr->nr_public = public;
    nr->nr_secure = contact->m_url->url_type == url_sips;
    nr->nr_contact = contact;
1282
    nr->nr_via = v;
1283 1284
    nr->nr_ip4 = host_is_ip4_address(contact->m_url->url_host);
    nr->nr_ip6 = !nr->nr_ip4 && host_is_ip6_reference(contact->m_url->url_host);
1285

1286 1287 1288
    SU_DEBUG_9(("nua_register: Adding contact URL '%s' to list.\n", contact->m_url->url_host));

    ++nr_items;
1289 1290
    nr->nr_next = *next, nr->nr_prev = next; *next = nr, next = &nr->nr_next;
    nr->nr_list = list;
1291 1292
  }

1293 1294
  su_home_deinit(autohome);

1295 1296 1297
  return 0;
}

1298
static
1299
void nua_stack_tport_update(nua_t *nua, nta_agent_t *nta)
1300
{
1301 1302 1303 1304
#if 0
  nua_registration_t *default_oc;
  nua_registration_t const *defaults = nua->nua_registrations;
  sip_via_t *via = nta_agent_via(nta);
1305

1306
  default_oc = outbound_by_aor(defaults, NULL, 1);
1307

1308 1309
  if (default_oc) {
    assert(default_oc->nr_via);
1310

1311 1312 1313
    outbound_contacts_from_via(default_oc,
				       via,
				       via->v_next);
1314

1315 1316 1317 1318 1319
    /* refresh_register(nua_handle_t *nh, nua_dialog_usage_t *du, sip_time_t now); */
  }
#endif
  return;
}
1320

1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
nua_registration_t *nua_registration_by_aor(nua_registration_t const *list,
					    sip_from_t const *aor,
					    url_t const *remote_uri,
					    int only_default)
{
  sip_from_t *alt_aor = NULL, _alt_aor[1];
  int sips_aor = aor && aor->a_url->url_type == url_sips;
  int sips_uri = remote_uri && remote_uri->url_type == url_sips;

  nua_registration_t const *nr, *public = NULL, *any = NULL;
  nua_registration_t const *namewise = NULL, *sipswise = NULL;

1333 1334 1335
  int ip4 = remote_uri && host_is_ip4_address(remote_uri->url_host);
  int ip6 = remote_uri && host_is_ip6_reference(remote_uri->url_host);

1336 1337 1338 1339 1340 1341 1342
  if (only_default || aor == NULL) {
    /* Ignore AoR, select only by remote_uri */
    for (nr = list; nr; nr = nr->nr_next) {
      if (!nr->nr_ready)
	continue;
      if (only_default && !nr->nr_default)
	continue;
1343 1344 1345 1346
      if (nr->nr_ip4 && ip6)
	continue;
      if (nr->nr_ip6 && ip4)
	continue;
1347 1348 1349 1350 1351 1352
      if (sips_uri ? nr->nr_secure : !nr->nr_secure) 
	return (nua_registration_t *)nr;
      if (!public && nr->nr_public)
	public = nr;
      if (!any)
	any = nr;
1353
    }
1354 1355 1356 1357 1358
    if (public)
      return (nua_registration_t *)public;
    if (any)
      return (nua_registration_t *)any;
    return NULL;
1359 1360
  }

1361 1362
  if (!sips_aor && aor)
    alt_aor = memcpy(_alt_aor, aor, sizeof _alt_aor);
1363

1364 1365 1366 1367 1368 1369 1370 1371 1372
  for (nr = list; nr; nr = nr->nr_next) {
    if (!nr->nr_ready)
      continue;
    if (nr->nr_aor) {
      if (aor && url_cmp(nr->nr_aor->a_url, aor->a_url) == 0)
	return (nua_registration_t *)nr;
      if (!namewise && alt_aor && url_cmp(nr->nr_aor->a_url, aor->a_url) == 0)
	namewise = nr;
    }
1373
    if (!sipswise && ((sips_aor || sips_uri) ? nr->nr_secure : !nr->nr_secure))
1374 1375 1376 1377 1378
      sipswise = nr;
    if (!public && nr->nr_public)
      public = nr;
    if (!any)
      any = nr;
1379 1380
  }

1381 1382 1383 1384
  if (namewise)
    return (nua_registration_t *)namewise;
  if (sipswise)
    return (nua_registration_t *)sipswise;
1385

1386 1387 1388 1389 1390 1391 1392 1393
  /* XXX - 
     should we do some policing whether sips_aor or sips_uri can be used
     with sip contact?
  */
  if (public)
    return (nua_registration_t *)public;
  if (any)
    return (nua_registration_t *)any;
1394

1395
  return NULL;
1396 1397
}

1398

1399
nua_registration_t *
1400
nua_registration_for_request(nua_registration_t const *list, sip_t const *sip)
1401
{
1402 1403
  sip_from_t const *aor;
  url_t *uri;
1404

1405 1406
  aor = sip->sip_from;
  uri = sip->sip_request->rq_url;
1407

1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420
  return nua_registration_by_aor(list, aor, uri, 0);
}

nua_registration_t *
nua_registration_for_response(nua_registration_t const *list, 
			      sip_t const *sip,
			      sip_record_route_t const *record_route,
			      sip_contact_t const *remote_contact)
{
  sip_to_t const *aor = NULL;
  url_t const *uri = NULL;

  if (sip)
1421
    aor = sip->sip_to;
1422 1423 1424 1425 1426 1427 1428 1429 1430
  
  if (record_route)
    uri = record_route->r_url;
  else if (sip && sip->sip_record_route)
    uri = sip->sip_record_route->r_url;
  else if (remote_contact)
    uri = remote_contact->m_url;
  else if (sip && sip->sip_from)
    uri = sip->sip_from->a_url;
1431

1432
  return nua_registration_by_aor(list, aor, uri, 0);
1433
}
1434

1435