nua_register.c 55.1 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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 * @author Kai Vehmanen <Kai.Vehmanen@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_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_contact_t nr_dcontact[1];	/**< Contact in dialog */
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  sip_via_t *nr_via;		/**< Corresponding Via headers */
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  unsigned long nr_min_expires;	/**< Value from 423 negotiation */

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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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/* Interface towards outbound_t */
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sip_contact_t *nua_handle_contact_by_via(nua_handle_t *nh,
					 su_home_t *home,
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					 int in_dialog,
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					 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_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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 * As alternative to OPTIONS/STUN keepalives, the client can propose
 * a more frequent registration refresh interval with
 * NUTAG_M_FEATURES() (e.g. NUTAG_M_FEATURES("expires=120") given as 
 * parameter to nua_register()).
 * 
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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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static int nua_register_client_template(nua_client_request_t *cr,
					msg_t **return_msg,
					tagi_t const *tags);
static int nua_register_client_init(nua_client_request_t *cr,
				    msg_t *, sip_t *,
				    tagi_t const *tags);
static int nua_register_client_request(nua_client_request_t *cr,
				       msg_t *, sip_t *,
				       tagi_t const *tags);
static int nua_register_client_check_restart(nua_client_request_t *cr,
					     int status, char const *phrase,
					     sip_t const *sip);
static int nua_register_client_response(nua_client_request_t *cr,
					int status, char const *phrase,
					sip_t const *sip);

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static nua_client_methods_t const nua_register_client_methods = {
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  SIP_METHOD_REGISTER,
  0,
  {
    /* create_dialog */ 1,
    /* in_dialog */ 0,
    /* target refresh */ 0
  },
  nua_register_client_template,
  nua_register_client_init,
  nua_register_client_request,
  nua_register_client_check_restart,
  nua_register_client_response
};

/**@internal Send REGISTER. */
int nua_stack_register(nua_t *nua,
		       nua_handle_t *nh,
		       nua_event_t e,
		       tagi_t const *tags)
{
  return nua_client_create(nh, e, &nua_register_client_methods, tags);
}

static int nua_register_client_template(nua_client_request_t *cr,
					msg_t **return_msg,
					tagi_t const *tags)
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{
  nua_dialog_usage_t *du;

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  if (cr->cr_event == nua_r_register)
    return 0;

  /* Use a copy of REGISTER message as the template for un-REGISTER */
  du = nua_dialog_usage_get(cr->cr_owner->nh_ds, nua_register_usage, NULL);
  if (du && du->du_cr) {
    if (nua_client_set_target(cr, du->du_cr->cr_target) < 0)
      return -1;
    *return_msg = msg_copy(du->du_cr->cr_msg);
    return 1;
  }

  return 0;
}

static int nua_register_client_init(nua_client_request_t *cr,
				    msg_t *msg, sip_t *sip,
				    tagi_t const *tags)
{
  nua_handle_t *nh = cr->cr_owner;
  nua_dialog_usage_t *du;
  nua_registration_t *nr;
  sip_to_t const *aor = sip->sip_to;

  int unreg;
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  /* Explicit empty (NULL) contact - used for CPL store/remove? */
  if (!sip->sip_contact && cr->cr_has_contact)
    /* Do not create any usage */
    return 0;

  unreg = cr->cr_event != nua_r_register ||
    (sip->sip_expires && sip->sip_expires->ex_delta == 0);
  if (unreg)
    nua_client_terminating(cr);
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  du = nua_dialog_usage_add(nh, nh->nh_ds, nua_register_usage, NULL);
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  if (du == NULL)
    return -1;
  nr = nua_dialog_usage_private(du);

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  nua_registration_add(&nh->nh_nua->nua_registrations, nr);
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  if (nua_client_bind(cr, du) < 0)
    return -1;
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  if (aor == NULL)
    aor = sip->sip_from;
  if (aor == NULL)
    aor = nh->nh_nua->nua_from;
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  if (nua_registration_set_aor(nh->nh_home, nr, aor) < 0)
    return -1;
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  if (nua_registration_set_contact(nh, nr, sip->sip_contact, unreg) < 0)
    return -1;
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  if (!nr->nr_ob && (NH_PGET(nh, outbound) || NH_PGET(nh, instance))) {
    nr->nr_ob = outbound_new(nh, &nua_stack_outbound_callbacks,
			     nh->nh_nua->nua_root,
			     nh->nh_nua->nua_nta,
			     NH_PGET(nh, instance));
    if (!nr->nr_ob)
      return nua_client_return(cr, 900, "Cannot create outbound", msg);
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  }
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  if (nr->nr_ob) {
    outbound_t *ob = nr->nr_ob;
    sip_contact_t *m;

    if (!unreg && sip->sip_contact) {
      for (m = sip->sip_contact; m; m = m->m_next)
	if (!m->m_expires || strtoul(m->m_expires, NULL, 10) != 0)
	  break;
      
      if (m == NULL)
	unreg = 1;	/* All contacts have expires=0 */
    }

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    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));

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    if (outbound_set_contact(ob, sip->sip_contact, nr->nr_via, unreg) < 0)
      return nua_client_return(cr, 900, "Cannot set outbound contact", msg);
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  }

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  return 0;
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}

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static
int nua_register_client_request(nua_client_request_t *cr,
				msg_t *msg, sip_t *sip,
				tagi_t const *tags)
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{
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  nua_handle_t *nh = cr->cr_owner;
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  nua_dialog_usage_t *du = cr->cr_usage;
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  nua_registration_t *nr;
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  sip_contact_t *m, *contacts = sip->sip_contact;
  char const *min_expires = NULL;
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  int unreg;

  (void)nh;

  /* Explicit empty (NULL) contact - used for CPL store/remove? */
  if (!contacts && cr->cr_has_contact)
    return nua_base_client_request(cr, msg, sip, tags);

  if ((du && du->du_shutdown) ||
      (sip->sip_expires && sip->sip_expires->ex_delta == 0))
    nua_client_terminating(cr);

  if (contacts) {
    if (!cr->cr_terminating) {
      for (m = contacts; m; m = m->m_next)
	if (!m->m_expires || strtoul(m->m_expires, NULL, 10) != 0)
	  break;
      /* All contacts have expires=0 */
      if (m == NULL)
	nua_client_terminating(cr);
    }
  }
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  unreg = cr->cr_terminating;
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  nr = nua_dialog_usage_private(du);
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  if (nr) {
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    if (nr->nr_ob) {
      outbound_stop_keepalive(nr->nr_ob);
      outbound_start_registering(nr->nr_ob);
    }
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    if (nr->nr_by_stack) {
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      sip_contact_t *m = nr->nr_contact, *previous = NULL;

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      outbound_get_contacts(nr->nr_ob, &m, &previous);
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      sip_add_dup(msg, sip, (sip_header_t *)m);
      /* previous is an outdated contact generated by stack 
       * and it is now unregistered */
      if (previous)
	sip_add_dup(msg, sip, (sip_header_t *)previous);
    }
  }

  for (m = sip->sip_contact; m; m = m->m_next) {
    if (m->m_url->url_type == url_any) {
      /* If there is a '*' in contact list, remove everything else */
      while (m != sip->sip_contact)
	sip_header_remove(msg, sip, (sip_header_t *)sip->sip_contact);
      while (m->m_next)
	sip_header_remove(msg, sip, (sip_header_t *)m->m_next);
      contacts = m;
      break;
    }

    if (!m->m_expires)
      continue;
    if (unreg) {
      /* Remove the expire parameters from contacts */
      msg_header_remove_param(m->m_common, "expires");
    }
    else if (nr && nr->nr_min_expires && 
	     strtoul(m->m_expires, 0, 10) < nr->nr_min_expires) {
      if (min_expires == NULL) 
	min_expires = su_sprintf(msg_home(msg), "expires=%lu", 
				 nr->nr_min_expires);
      msg_header_replace_param(msg_home(msg), m->m_common, min_expires);
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    }
  }
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  return nua_base_client_trequest(cr, msg, sip,
				  TAG_IF(unreg, SIPTAG_EXPIRES_STR("0")),
#if 0
				  TAG_IF(unreg, NTATAG_SIGCOMP_CLOSE(1)),
				  TAG_IF(!unreg, NTATAG_COMP("sigcomp")),
#endif
				  TAG_NEXT(tags));
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}
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static int nua_register_client_check_restart(nua_client_request_t *cr,
					     int status, char const *phrase,
					     sip_t const *sip)
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{
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  nua_registration_t *nr = nua_dialog_usage_private(cr->cr_usage);
  unsigned short retry_count = cr->cr_retry_count;
  int restart = 0, retry;

  if (nr && nr->nr_ob) {
    msg_t *_reqmsg = nta_outgoing_getrequest(cr->cr_orq);
    sip_t *req = sip_object(_reqmsg); msg_destroy(_reqmsg);
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    retry = outbound_register_response(nr->nr_ob, cr->cr_terminating,
				       req, sip);
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    restart = retry >= ob_reregister_now;
    
    if (retry == ob_reregister)
      /* outbound restarts REGISTER later */;

    if (retry < 0)
      /* XXX - report an error? */;
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  }
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  if (nr && status == 423) {
    if (sip->sip_min_expires)
      nr->nr_min_expires = sip->sip_min_expires->me_delta;
  }

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  /* Check for status-specific reasons to retry */
  if (nua_base_client_check_restart(cr, status, phrase, sip))
    return 1;
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  /* Restart only if nua_base_client_check_restart() did not try to restart */
  if (restart && retry_count == cr->cr_retry_count)
    return nua_client_restart(cr, status, phrase);
  
  return 0;
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}

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static int nua_register_client_response(nua_client_request_t *cr,
					int status, char const *phrase,
					sip_t const *sip)
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{
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  nua_handle_t *nh = cr->cr_owner;
  nua_dialog_usage_t *du = cr->cr_usage;
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  nua_registration_t *nr = nua_dialog_usage_private(du);
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  int ready;
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  ready = du && !cr->cr_terminated && status < 300;
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  if (ready) {
    sip_time_t mindelta = 0;
    sip_time_t now = sip_now(), delta, reqdelta, mdelta;
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    sip_contact_t const *m, *sent;
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    msg_t *_reqmsg = nta_outgoing_getrequest(cr->cr_orq);
    sip_t *req = sip_object(_reqmsg);

    msg_destroy(_reqmsg);

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    assert(nr); assert(sip); assert(req);
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#if HAVE_SIGCOMP
    {
      struct sigcomp_compartment *cc;
      cc = nta_outgoing_compartment(cr->cr_orq);
      sigcomp_compartment_unref(nr->nr_compartment);
      nr->nr_compartment = cc;
    }
#endif
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    /* XXX - if store/remove, remove 
       Content-Disposition
       Content-Type
       body
    */
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    /** Search for lowest delta of SIP contacts we tried to register */
    mindelta = SIP_TIME_MAX;
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    reqdelta = req->sip_expires ? req->sip_expires->ex_delta : 0;
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    for (m = sip->sip_contact; m; m = m->m_next) {
      if (m->m_url->url_type != url_sip && 
	  m->m_url->url_type != url_sips)
	continue;
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      for (sent = req->sip_contact; sent; sent = sent->m_next) {
	if (url_cmp(m->m_url, sent->m_url))
	  continue;

	if (sent->m_expires)
	  mdelta = strtoul(sent->m_expires, NULL, 10);
	else
	  mdelta = reqdelta;

	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;
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      }
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    }
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    if (mindelta == SIP_TIME_MAX)
      mindelta = 3600;

    nua_dialog_usage_set_expires(du, mindelta);
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  /*  RFC 3608 Section 6.1 Procedures at the UA
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   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.
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  */
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    su_free(nh->nh_home, nr->nr_route);
    nr->nr_route = sip_route_dup(nh->nh_home, sip->sip_service_route);
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    {
      /* RFC 3327 */
      /* Store last URI in Path header */
      sip_path_t *path = sip->sip_path;
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      while (path && path->r_next)
	path = path->r_next;
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      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);
      }
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    }

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    if (sip->sip_to->a_url->url_type == url_sips)
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      nr->nr_secure = 1;
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    if (nr->nr_ob) {
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      outbound_gruuize(nr->nr_ob, sip);
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      outbound_start_keepalive(nr->nr_ob, cr->cr_orq);
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    }
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    /* persistant connection for registration */
    if (!nr->nr_tport)
      /* note: nta_outgoing_transport() takes a ref */
      nr->nr_tport = nta_outgoing_transport (cr->cr_orq); 

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    nua_registration_set_ready(nr, 1);
  }
  else if (du) {
    nua_dialog_usage_set_expires(du, 0);

    su_free(nh->nh_home, nr->nr_route);
    nr->nr_route = NULL;

    outbound_stop_keepalive(nr->nr_ob);

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    /* release the persistant transport for registration */
    if (nr->nr_tport)
      tport_decref(&nr->nr_tport), nr->nr_tport = NULL;

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    nua_registration_set_ready(nr, 0);
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  }


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  return nua_base_client_response(cr, status, phrase, sip, NULL);
}

static void nua_register_usage_refresh(nua_handle_t *nh,
				       nua_dialog_state_t *ds,
				       nua_dialog_usage_t *du,
				       sip_time_t now)
{
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  nua_t *nua = nh->nh_nua;
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  nua_client_request_t *cr = du->du_cr;

  if (cr) {
    if (nua_client_is_queued(cr) /* Already registering. */
	|| nua_client_resend_request(cr, 0, NULL) >= 0)
      return;
  }

  /* Report that we have de-registered */
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  nua_stack_event(nua, nh, NULL, nua_r_register, NUA_INTERNAL_ERROR, NULL);
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  nua_dialog_usage_remove(nh, ds, du);
}

/** @interal Shut down REGISTER usage.
 *
 * @retval >0  shutdown done
 * @retval 0   shutdown in progress
 * @retval <0  try again later
 */
static int nua_register_usage_shutdown(nua_handle_t *nh,
				     nua_dialog_state_t *ds,
				     nua_dialog_usage_t *du)
{
  nua_client_request_t *cr = du->du_cr;
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  nua_registration_t *nr = nua_dialog_usage_private(du);
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  if (cr) {
    if (nua_client_is_queued(cr)) /* Already registering. */
      return -1;
    cr->cr_event = nua_r_unregister;
    if (nua_client_resend_request(cr, 1, NULL) >= 0)
      return 0;
  }

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  /* release the persistant transport for registration */
  if (nr->nr_tport)
    tport_decref(&nr->nr_tport), nr->nr_tport = NULL;

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  nua_dialog_usage_remove(nh, ds, du);
  return 200;
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}
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/* ---------------------------------------------------------------------- */
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/* nua_registration_t interface */
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#if HAVE_SOFIA_STUN
#include <sofia-sip/stun.h>
#endif

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static void nua_stack_tport_update(nua_t *nua, nta_agent_t *nta);
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static int nua_registration_add_contact_and_route(nua_handle_t *nh,
						  nua_registration_t *nr,
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						  msg_t *msg,
						  sip_t *sip,
						  int add_contact,
						  int add_service_route);
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int
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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,
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          NUTAG_URL_REF(contact1),
          NUTAG_SIPS_URL_REF(contact2),
          NUTAG_CERTIFICATE_DIR_REF(certificate_dir),
          TAG_END());
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  if (!contact1 && contact2)
    contact1 = contact2, contact2 = NULL;

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  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";

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  if (!contact1 /* && !contact2 */) {
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    if (nta_agent_add_tport(nua->nua_nta, NULL,
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			    TPTAG_IDENT("sip"),
			    TPTAG_CERTIFICATE(certificate_dir),
			    TAG_NEXT(nua->nua_args)) < 0 &&
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        nta_agent_add_tport(nua->nua_nta, URL_STRING_MAKE("sip:*:*"),
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			    TPTAG_IDENT("sip"),
			    TPTAG_CERTIFICATE(certificate_dir),
			    TAG_NEXT(nua->nua_args)) < 0)
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      return -1;
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#if HAVE_SOFIA_STUN
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    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"));
    }
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#endif
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  }
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  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;
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  }

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  if (nua_stack_init_registrations(nua) < 0)
    return -1;

  return 0;
}

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#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:
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    nua_stack_event(nua, NULL, NULL, nua_i_network_changed, SIP_200_OK, NULL);
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    break;
    
  case NUA_NW_DETECT_TRY_FULL:

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