nua_params.c 44.3 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>
 *
 * @date Created: Wed Mar  8 11:48:49 EET 2006 ppessi
 */

#include "config.h"

#include <sofia-sip/string0.h>
#include <sofia-sip/su_strlst.h>
#include <sofia-sip/token64.h>
#include <sofia-sip/su_tagarg.h>
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#include <sofia-sip/su_tag_inline.h>
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#include <sofia-sip/bnf.h>

#include <sofia-sip/sip_protos.h>
#include <sofia-sip/sip_util.h>
#include <sofia-sip/sip_status.h>
#include <sofia-sip/msg_parser.h>

#include "nua_stack.h"

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

#include <assert.h>

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#if !HAVE_STRCASESTR
char *strcasestr(char const *haystack, char const *needle);
#endif

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/* ====================================================================== */
/* Helper macros and functions for handling #nua_handle_preferences_t. */

#define NHP_IS_ANY_SET(nhp) nhp_is_any_set((nhp))

/** Check if any preference is set in @a nhp. */
su_inline int nhp_is_any_set(nua_handle_preferences_t const *nhp)
{
  char nhp_zero[sizeof nhp->nhp_set] = { 0 };
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  return memcmp(&nhp->nhp_set, nhp_zero, sizeof nhp->nhp_set) != 0;
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}

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/** Copy set parameters from @a b to @a a.
 *
 * If preference is set in @a b, mark it set also in @a a.
 */
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su_inline void nhp_or_set(nua_handle_preferences_t *a,
			  nua_handle_preferences_t const *b)
{
  unsigned *ap = (unsigned *)&a->nhp_set;
  unsigned const *bp = (unsigned const *)&b->nhp_set;
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  size_t i;
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  memcpy(a, b, offsetof(nua_handle_preferences_t, nhp_set));

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  for (i = 0; i < (sizeof a->nhp_set); i += (sizeof *ap))
    *ap++ |= *bp++;
}

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static int nhp_set_tags(su_home_t *home, 
			nua_handle_preferences_t *nhp,
			int global,
			tagi_t const *tags);
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static int nhp_merge_lists(su_home_t *home,
			   msg_hclass_t *hc,
			   msg_list_t **return_new_list,
			   msg_list_t const *old_list,
			   int already_set,
			   int already_parsed,
			   int always_merge,
			   tag_value_t value);
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static
nua_handle_preferences_t *nhp_move_params(su_home_t *home,
					  nua_handle_preferences_t *dst,
					  su_home_t *tmphome,
					  nua_handle_preferences_t const *src);
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/* ====================================================================== */
/* Magical NUTAG_USER_AGENT() - add NHP_USER_AGENT there if it is not there */

#define NHP_USER_AGENT PACKAGE_NAME "/" PACKAGE_VERSION

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static int already_contains_package_name(char const *s)
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{
  char const pn[] = " " PACKAGE_NAME "/";
  size_t pnlen = strlen(pn + 1);
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  return strncasecmp(s, pn + 1, pnlen) == 0 || strcasestr(s, pn);
}
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/* ====================================================================== */
/* Stack and handle parameters */

static int nua_stack_set_smime_params(nua_t *nua, tagi_t const *tags);

/** @internal Methods allowed by default. */
static char const nua_allow_str[] =
"INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, "
"MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE";

/** @internal Set default parameters */
int nua_stack_set_defaults(nua_handle_t *nh, 
			   nua_handle_preferences_t *nhp)
{
  su_home_t *home = (su_home_t *)nh;

  /* Set some defaults */
  NHP_SET(nhp, retry_count, 3);
  NHP_SET(nhp, max_subscriptions, 20);

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  NHP_SET(nhp, media_enable, 1);
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  NHP_SET(nhp, invite_enable, 1);
  NHP_SET(nhp, auto_alert, 0);
  NHP_SET(nhp, early_media, 0);
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  NHP_SET(nhp, only183_100rel, 0);
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  NHP_SET(nhp, auto_answer, 0);
  NHP_SET(nhp, auto_ack, 1);
  NHP_SET(nhp, invite_timeout, 120);

  NHP_SET(nhp, session_timer, 1800);
  NHP_SET(nhp, min_se, 120);
  NHP_SET(nhp, refresher, nua_no_refresher);
  NHP_SET(nhp, update_refresh, 0);

  NHP_SET(nhp, message_enable, 1);
  NHP_SET(nhp, win_messenger_enable, 0);
  if (getenv("PIMIW_HACK") != 0)
    NHP_SET(nhp, message_auto_respond, 1);

  NHP_SET(nhp, media_features,  0);
  NHP_SET(nhp, callee_caps, 0);
  NHP_SET(nhp, service_route_enable, 1);
  NHP_SET(nhp, path_enable, 1);

  NHP_SET(nhp, refer_expires, 300);
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  NHP_SET(nhp, refer_with_id, 1);
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  NHP_SET(nhp, substate, nua_substate_active);

  NHP_SET(nhp, allow, sip_allow_make(home, nua_allow_str));
  NHP_SET(nhp, supported, sip_supported_make(home, "timer, 100rel"));
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  NHP_SET(nhp, user_agent, su_strdup(home, NHP_USER_AGENT));
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  NHP_SET(nhp, outbound, su_strdup(home, "natify"));
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  NHP_SET(nhp, keepalive, 120000);
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  if (!nhp->nhp_allow ||
      !nhp->nhp_supported ||
      !nhp->nhp_user_agent ||
      !nhp->nhp_outbound)
    return -1;

  return 0;
}

/** @internal Set the default from field */
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int nua_stack_set_from(nua_t *nua, int initial, tagi_t const *tags)
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{
  sip_from_t const *from = NONE;
  char const *str = NONE;
  sip_from_t *f = NULL,  f0[1];

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  char const *uicc_name = "default";

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  tl_gets(tags,
	  /* By nua_stack_set_from() */
	  SIPTAG_FROM_REF(from),
	  SIPTAG_FROM_STR_REF(str),
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	  NUTAG_UICC_REF(uicc_name),
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	  TAG_END());

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#if HAVE_UICC_H
  if (initial && uicc_name)
    nua->nua_uicc = uicc_create(root, uicc_name);
#endif

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  if (!initial && from == NONE && str == NONE)
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    return 0;
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  sip_from_init(f0);

  if (from && from != NONE) {
    f0->a_display = from->a_display;
    *f0->a_url = *from->a_url;
    f = sip_from_dup(nua->nua_home, f0);
  }
  else if (str && str != NONE) {
    f = sip_from_make(nua->nua_home, str);
    if (f)
      *f0 = *f, f = f0, f->a_params = NULL;
  }
  else {
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    sip_contact_t const *m;

    m = nua_stack_get_contact(nua->nua_registrations);
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    if (m) {
      f0->a_display = m->m_display;
      *f0->a_url = *m->m_url;
      f = sip_from_dup(nua->nua_home, f0);
    }
  }

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  if (!f)
    return -1;

  *nua->nua_from = *f;
  return 0;
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}

/** @internal Initialize instance ID. */
int nua_stack_init_instance(nua_handle_t *nh, tagi_t const *tags)
{
  nua_handle_preferences_t *nhp = nh->nh_prefs;

  char const *instance = NONE;

  tl_gets(tags, NUTAG_INSTANCE_REF(instance), TAG_END());

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  if (instance != NONE) {
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    NHP_SET(nhp, instance, su_strdup(nh->nh_home, instance));
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    if (instance && !nhp->nhp_instance)
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      return -1;
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  }

  return 0;
}

/**@fn void nua_set_params(nua_t *nua, tag_type_t tag, tag_value_t value, ...)
 *
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 * Set @nua parameters, shared by all handles.
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 *
 * @param nua             Pointer to NUA stack object
 * @param tag, value, ... List of tagged parameters
 *
 * @return
 *     nothing
 *
 * @par Related tags:
 *   NUTAG_ALLOW() \n
 *   NUTAG_AUTOACK() \n
 *   NUTAG_AUTOALERT() \n
 *   NUTAG_AUTOANSWER() \n
 *   NUTAG_CALLEE_CAPS() \n
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 *   NUTAG_DETECT_NETWORK_UPDATES() \n
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 *   NUTAG_EARLY_ANSWER() \n
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 *   NUTAG_EARLY_MEDIA() \n
 *   NUTAG_ENABLEINVITE() \n
 *   NUTAG_ENABLEMESSAGE() \n
 *   NUTAG_ENABLEMESSENGER() \n
 *   NUTAG_INSTANCE() \n
 *   NUTAG_INVITE_TIMER() \n
 *   NUTAG_KEEPALIVE() \n
 *   NUTAG_KEEPALIVE_STREAM() \n
 *   NUTAG_MAX_SUBSCRIPTIONS() \n
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 *   NUTAG_MEDIA_ENABLE() \n
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 *   NUTAG_MEDIA_FEATURES() \n
 *   NUTAG_MIN_SE() \n
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 *   NUTAG_M_DISPLAY() \n
 *   NUTAG_M_FEATURES() \n
 *   NUTAG_M_PARAMS() \n
 *   NUTAG_M_USERNAME() \n
 *   NUTAG_ONLY183_100REL() \n
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 *   NUTAG_OUTBOUND() \n
 *   NUTAG_PATH_ENABLE() \n
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 *   NUTAG_REFER_EXPIRES() \n
 *   NUTAG_REFER_WITH_ID() \n
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 *   NUTAG_REGISTRAR() \n
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 *   NUTAG_RETRY_COUNT() \n
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 *   NUTAG_SERVICE_ROUTE_ENABLE() \n
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 *   NUTAG_SESSION_REFRESHER() \n
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 *   NUTAG_SESSION_TIMER() \n
 *   NUTAG_SMIME_ENABLE() \n
 *   NUTAG_SMIME_KEY_ENCRYPTION() \n
 *   NUTAG_SMIME_MESSAGE_DIGEST() \n
 *   NUTAG_SMIME_MESSAGE_ENCRYPTION() \n
 *   NUTAG_SMIME_OPT() \n
 *   NUTAG_SMIME_PROTECTION_MODE() \n
 *   NUTAG_SMIME_SIGNATURE() \n
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 *   NUTAG_SOA_NAME() \n
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 *   NUTAG_SUBSTATE() \n
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 *   NUTAG_SUPPORTED() \n
 *   NUTAG_UPDATE_REFRESH() \n
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 *   NUTAG_USER_AGENT() \n
 *   SIPTAG_ALLOW() \n
 *   SIPTAG_ALLOW_STR() \n
 *   SIPTAG_FROM() \n
 *   SIPTAG_FROM_STR() \n
 *   SIPTAG_ORGANIZATION() \n
 *   SIPTAG_ORGANIZATION_STR() \n
 *   SIPTAG_SUPPORTED() \n
 *   SIPTAG_SUPPORTED_STR() \n
 *   SIPTAG_USER_AGENT() \n
 *   SIPTAG_USER_AGENT_STR() \n
 *
 * nua_set_params() also accepts any soa tags, defined in
 * <sofia-sip/soa_tag.h>, and nta tags, defined in <sofia-sip/nta_tag.h>.
 * 
 * @par Events:
 *     nua_r_set_params
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 *
 * @par SIP Header as NUA Parameters
 * The @nua parameters include SIP headers @Allow, @Supported, @Organization,
 * @UserAgent and @From. They are included in most of the SIP messages sent
 * by @nua. They are set in the same way as the tagged arguments are
 * used to populate a SIP message.
 * @par
 * When multiple tags for the same header are specified, the behaviour
 * depends on the header type. If only a single header field can be included
 * in a SIP message, the latest non-NULL value is used, e.g., @Organization. 
 * However, if the SIP header can consist of multiple lines or header fields
 * separated by comma, in this case, @Allow and @Supported, all the tagged
 * values are concatenated.
 * @par
 * However, if the tag value is #SIP_NONE (-1 casted as a void pointer), the
 * values from previous tags are ignored.
 *
 * For example, the nua_set_params() call like this:
 * @code
 * nua_set_params(nua,
 *                SIPTAG_USER_AGENT_STR("tester/1.0"),
 *                SIPTAG_ALLOW_STR("INVITE,CANCEL,BYE,ACK"),
 *                SIPTAG_ORGANIZATION(NULL),
 *                SIPTAG_USER_AGENT(NULL),
 *                SIPTAG_ALLOW(SIP_NONE),
 *                TAG_END());
 * @endcode
 * will leave @Allow and @Organization headers empty. The @UserAgent header
 * will contain value "tester/1.0".
 * @code
 * nua_set_params(nua,
 *                SIPTAG_ORGANIZATION_STR("Malevolent Microwavers"),
 *                SIPTAG_ALLOW_STR("OPTIONS"),
 *                SIPTAG_ALLOW(SIP_NONE),
 *                SIPTAG_ORGANIZATION_STR("The Phone Company"),
 *                SIPTAG_ALLOW_STR("SUBSCRIBE"),
 *                SIPTAG_ALLOW(NULL),
 *                SIPTAG_ORGANIZATION_STR(NULL),
 *                TAG_END());
 * @endcode
 * sets the header @Allow with value <code>SUBSCRIBE</code> and the
 * header @Organization will have value <code>The Phone Company</code>.
 *
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 */

/**@fn void nua_set_hparams(nua_handle_t *nh, tag_type_t tag, tag_value_t value, ...);
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 *
 * Set the handle-specific parameters.
 *
 * The handle-specific parameters override default or global parameters set
 * by nua_set_params(). The handle-specific parameters are set by several
 * other operations: nua_invite(), nua_respond(), nua_ack(),
 * nua_prack(), nua_update(), nua_info(), nua_bye(), nua_options(),
 * nua_message(), nua_register(), nua_publish(), nua_refer(),
 * nua_subscribe(), nua_notify(), nua_refer(), and nua_notifier().
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 *
 * @param nh              Pointer to a NUA handle
 * @param tag, value, ... List of tagged parameters
 *
 * @return
 *     nothing
 *
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 * @par Tags Used to Set Handle-Specific Parameters:
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 *   NUTAG_ALLOW() \n
 *   NUTAG_AUTOACK() \n
 *   NUTAG_AUTOALERT() \n
 *   NUTAG_AUTOANSWER() \n
 *   NUTAG_CALLEE_CAPS() \n
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 *   NUTAG_EARLY_ANSWER() \n
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 *   NUTAG_EARLY_MEDIA() \n
 *   NUTAG_ENABLEINVITE() \n
 *   NUTAG_ENABLEMESSAGE() \n
 *   NUTAG_ENABLEMESSENGER() \n
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 *   NUTAG_INSTANCE() \n
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 *   NUTAG_INVITE_TIMER() \n
 *   NUTAG_KEEPALIVE() \n
 *   NUTAG_KEEPALIVE_STREAM() \n
 *   NUTAG_MAX_SUBSCRIPTIONS() \n
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 *   NUTAG_MEDIA_ENABLE() \n
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 *   NUTAG_MEDIA_FEATURES() \n
 *   NUTAG_MIN_SE() \n
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 *   NUTAG_M_DISPLAY() \n
 *   NUTAG_M_FEATURES() \n
 *   NUTAG_M_PARAMS() \n
 *   NUTAG_M_USERNAME() \n
 *   NUTAG_ONLY183_100REL() \n
 *   NUTAG_OUTBOUND() \n
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 *   NUTAG_PATH_ENABLE() \n
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 *   NUTAG_REFER_EXPIRES() \n
 *   NUTAG_REFER_WITH_ID() \n
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 *   NUTAG_REGISTRAR() \n
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 *   NUTAG_RETRY_COUNT() \n
 *   NUTAG_SERVICE_ROUTE_ENABLE() \n
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 *   NUTAG_SESSION_REFRESHER() \n
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 *   NUTAG_SESSION_TIMER() \n
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 *   NUTAG_SOA_NAME() \n
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 *   NUTAG_SUBSTATE() \n
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 *   NUTAG_SUPPORTED() \n
 *   NUTAG_UPDATE_REFRESH() \n
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 *   NUTAG_USER_AGENT() \n
 *   SIPTAG_ALLOW() \n
 *   SIPTAG_ALLOW_STR() \n
 *   SIPTAG_ORGANIZATION() \n
 *   SIPTAG_ORGANIZATION_STR() \n
 *   SIPTAG_SUPPORTED() \n
 *   SIPTAG_SUPPORTED_STR() \n
 *   SIPTAG_USER_AGENT() \n
 *   SIPTAG_USER_AGENT_STR() \n
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 * Any soa tags are also considered as handle-specific parameters. They are
 * defined in <sofia-sip/soa_tag.h>.
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 *
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 * The global parameters that can not be set by nua_set_hparams() include 
 * NUTAG_DETECT_NETWORK_UPDATES(), NUTAG_SMIME_* tags, and all NTA tags.
 * 
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 * @par Events:
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 *     nua_r_set_params
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 */

int nua_stack_set_params(nua_t *nua, nua_handle_t *nh, nua_event_t e,
			 tagi_t const *tags)
{
  nua_handle_t *dnh = nua->nua_dhandle;
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  nua_handle_preferences_t tmp[1], *nhp = nh->nh_prefs;
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  nua_handle_preferences_t const *dnhp = dnh->nh_prefs;

  su_home_t tmphome[1] = { SU_HOME_INIT(tmphome) };

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  tagi_t const *ptags;
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  int error, global;
  int status = 900;
  char const *phrase = "Error storing parameters";
  sip_supported_t const *supported = NULL;
  sip_allow_t const *allow = NULL;
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  enter;
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  ptags = !nh->nh_used_ptags ? nh->nh_ptags : NULL;
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  *tmp = *nhp; NHP_UNSET_ALL(tmp);

  /* Supported features and allowed methods can be merged with previous ones */
  if (!NHP_ISSET(nhp, supported)) 
    supported = tmp->nhp_supported = dnhp->nhp_supported;
  if (!NHP_ISSET(nhp, allow)) 
    allow = tmp->nhp_allow = dnhp->nhp_allow;

  error = 0;
  global = nh == dnh;			/* save also stack-specific params */
    
  /* Set and save parameters to tmp */
  if (nhp_set_tags(tmphome, tmp, global, ptags) < 0)
    error = 1, phrase = "Error storing default handle parameters";
  else if (nhp_set_tags(tmphome, tmp, global, tags) < 0)
    error = 1, phrase = "Error storing parameters";
  else {
    if (NHP_IS_ANY_SET(tmp)) {
      if (tmp->nhp_supported == supported)
	tmp->nhp_supported = NULL;
      if (tmp->nhp_allow == allow)
	tmp->nhp_allow = NULL;

      /* Move parameters from tmp to nhp (or allocate new nhp) */
      if (nh != dnh && nhp == dnh->nh_prefs)
	nhp = NULL;
      nhp = nhp_move_params(nh->nh_home, nhp, tmphome, tmp);

      if (nhp)
	nh->nh_prefs = nhp;
      else
	/* Fail miserably with ENOMEM */
	error = 1, status = 900, phrase = su_strerror(ENOMEM);
    }

    if (!error)
      nh->nh_used_ptags = 1;
  }

  su_home_deinit(tmphome);

  if (error)
    ;
  else if (!nh->nh_soa && NHP_GET(nhp, dnhp, media_enable)) {
    /* Create soa when needed */
    char const *soa_name = NHP_GET(nhp, dnhp, soa_name);

    if (dnh->nh_soa)
      nh->nh_soa = soa_clone(dnh->nh_soa, nua->nua_root, nh);
    else  
      nh->nh_soa = soa_create(soa_name, nua->nua_root, nh);
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    ptags = nh->nh_ptags;

    if (!nh->nh_soa)
      error = 1, status = 900, phrase = "Error Creating SOA Object";
  }
  else if (nh->nh_soa && !NHP_GET(nhp, dnhp, media_enable)) {
    /* ... destroy soa when not needed */
    soa_destroy(nh->nh_soa), nh->nh_soa = NULL;
  }

  if (!error && nh->nh_soa) {
    if ((ptags && soa_set_params(nh->nh_soa, TAG_NEXT(ptags)) < 0) ||
	(tags && soa_set_params(nh->nh_soa, TAG_NEXT(tags)) < 0))
      error = 1, status = 900, phrase = "Error Setting SOA Parameters";
  }

  if (error || nh != dnh) {
    ;
  }
  else if (nua_stack_set_smime_params(nua, tags) < 0) {
    error = 1, status = 900, phrase = "Error setting S/MIME parameters";
  }
  else if (!nua->nua_nta) {
  }
  /* Set stack-specific things below */
  else if (nta_agent_set_params(nua->nua_nta, TAG_NEXT(tags)) < 0) {
    status = 900, phrase = "Error setting NTA parameters";
    error = 1;
  }
  else {
    nua_stack_set_from(nua, 0, tags);
    if (NHP_ISSET(nhp, detect_network_updates))
      nua_stack_launch_network_change_detector(nua);
  }

  if (error) {
    if (e == nua_i_none)
      SU_DEBUG_1(("nua_set_params(): failed: %s\n", phrase));
    return UA_EVENT2(e, status, phrase), -1;
  }

  if (e == nua_r_set_params)
    UA_EVENT2(e, 200, "OK");

  return 0;
}

/** Parse parameters from tags to @a nhp.
 *
 * @param home allocate new values from @a home
 * @param nhp  structure to store handle preferences
 * @param global  if true, save also global parameters
 * @param tags list of tags to parse
 */
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static int nhp_set_tags(su_home_t *home, 
			nua_handle_preferences_t *nhp,
			int global,
			tagi_t const *tags)
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{

/* Set copy of string to handle pref structure */
#define NHP_SET_STR(nhp, name, v)				 \
  if ((v) != (tag_value_t)0) {					 \
    char const *_value = (char const *)v;			 \
    char *_new = _value ? su_strdup(home, _value) : NULL;	 \
    if (NHP_ISSET(nhp, name))					 \
      su_free(home, (void *)nhp->nhp_##name);			 \
    NHP_SET(nhp, name, _new);					 \
    if (_new == NULL && _value != NULL)				 \
      return -1;						 \
  }

/* Set copy of string from url to handle pref structure */
#define NHP_SET_STR_BY_URL(nhp, name, v)			 \
  if ((v) != (tag_value_t)-1) {					 \
    url_t const *_value = (url_t const *)(v);			 \
    char *_new;							 \
    _new = url_as_string(home, (void *)_value);			 \
    if (NHP_ISSET(nhp, name))					 \
      su_free(home, (void *)nhp->nhp_##name);			 \
    NHP_SET(nhp, name, _new);					 \
    if (_new == NULL && _value != NULL)				 \
      return -1;						 \
  }

/* Set copy of header to handle pref structure */
#define NHP_SET_HEADER(nhp, name, v)				 \
  if ((v) != 0) {						 \
    sip_##name##_t const *_value = (sip_##name##_t const *)(v);	 \
    sip_##name##_t *_new = NULL;				 \
    if (_value != SIP_NONE)					 \
      _new = sip_##name##_dup(home, _value);			 \
    if (NHP_ISSET(nhp, name))					 \
      msg_header_free_all(home, (void *)nhp->nhp_##name);	 \
    NHP_SET(nhp, name, _new);					 \
    if (_new == NULL && _value != SIP_NONE)			 \
      return -1;						 \
  }

/* Set header made of string to handle pref structure */
#define NHP_SET_HEADER_STR(nhp, name, v)			 \
  if ((v) != 0) {						 \
    char const *_value = (char const *)(v);			 \
    sip_##name##_t *_new = NULL;				 \
    if (_value != SIP_NONE)					 \
      _new = sip_##name##_make(home, _value);			 \
    if (NHP_ISSET(nhp, name))					 \
      msg_header_free_all(home, (void *)nhp->nhp_##name);	 \
    NHP_SET(nhp, name, _new);					 \
    if (_new == NULL && _value != SIP_NONE)			 \
      return -1;						 \
  }

/* Set copy of string from header to handle pref structure */
#define NHP_SET_STR_BY_HEADER(nhp, name, v)			 \
  if ((v) != 0) {					 \
    sip_##name##_t const *_value = (sip_##name##_t const *)(v);	 \
    char *_new = NULL;						 \
    if (_value != SIP_NONE)					 \
      _new = sip_header_as_string(home, (void *)_value);	 \
    if (NHP_ISSET(nhp, name))					 \
      su_free(home, (void *)nhp->nhp_##name);			 \
    NHP_SET(nhp, name, _new);					 \
    if (_new == NULL && _value != SIP_NONE)			 \
      return -1;						 \
  }


  tagi_t const *t;
654 655

  for (t = tags; t; t = tl_next(t)) {
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    tag_type_t tag = t->t_tag;
    tag_value_t value = t->t_value;

    if (tag == NULL)
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      break;
    /* NUTAG_RETRY_COUNT(retry_count) */
662 663
    else if (tag == nutag_retry_count) {
      NHP_SET(nhp, retry_count, (unsigned)value);
664 665
    }
    /* NUTAG_MAX_SUBSCRIPTIONS(max_subscriptions) */
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    else if (tag == nutag_max_subscriptions) {
      NHP_SET(nhp, max_subscriptions, (unsigned)value);
    }
    /* NUTAG_SOA_NAME(soa_name) */
    else if (tag == nutag_soa_name) {
      NHP_SET_STR(nhp, soa_name, value);
    }
    /* NUTAG_MEDIA_ENABLE(media_enable) */
    else if (tag == nutag_media_enable) {
      NHP_SET(nhp, media_enable, value != 0);
676 677
    }
    /* NUTAG_ENABLEINVITE(invite_enable) */
678 679
    else if (tag == nutag_enableinvite) {
      NHP_SET(nhp, invite_enable, value != 0);
680 681
    }
    /* NUTAG_AUTOALERT(auto_alert) */
682 683
    else if (tag == nutag_autoalert) {
      NHP_SET(nhp, auto_alert, value != 0);
684
    }
685 686 687 688
    /* NUTAG_EARLY_ANSWER(early_answer) */
    else if (tag == nutag_early_answer) {
      NHP_SET(nhp, early_answer, value != 0);
    }
689
    /* NUTAG_EARLY_MEDIA(early_media) */
690 691
    else if (tag == nutag_early_media) {
      NHP_SET(nhp, early_media, value != 0);
692
    }
693
    /* NUTAG_ONLY183_100REL(only183_100rel) */
694 695
    else if (tag == nutag_only183_100rel) {
      NHP_SET(nhp, only183_100rel, value != 0);
696
    }
697
    /* NUTAG_AUTOANSWER(auto_answer) */
698 699
    else if (tag == nutag_autoanswer) {
      NHP_SET(nhp, auto_answer, value != 0);
700 701
    }
    /* NUTAG_AUTOACK(auto_ack) */
702 703
    else if (tag == nutag_autoack) {
      NHP_SET(nhp, auto_ack, value != 0);
704 705
    }
    /* NUTAG_INVITE_TIMER(invite_timeout) */
706 707
    else if (tag == nutag_invite_timer) {
      NHP_SET(nhp, invite_timeout, (unsigned)value);
708 709
    }
    /* NUTAG_SESSION_TIMER(session_timer) */
710 711
    else if (tag == nutag_session_timer) {
      NHP_SET(nhp, session_timer, (unsigned)value);
712 713
    }
    /* NUTAG_MIN_SE(min_se) */
714 715
    else if (tag == nutag_min_se) {
      NHP_SET(nhp, min_se, (unsigned)value);
716 717
    }
    /* NUTAG_SESSION_REFRESHER(refresher) */
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    else if (tag == nutag_session_refresher) {
      int refresher = value;

      if (refresher >= nua_remote_refresher)
	refresher = nua_remote_refresher;
      else if (refresher <= nua_no_refresher)
	refresher = nua_no_refresher;

      NHP_SET(nhp, refresher, refresher);
727 728
    }
    /* NUTAG_UPDATE_REFRESH(update_refresh) */
729 730
    else if (tag == nutag_update_refresh) {
      NHP_SET(nhp, update_refresh, value != 0);
731 732
    }
    /* NUTAG_ENABLEMESSAGE(message_enable) */
733 734
    else if (tag == nutag_enablemessage) {
      NHP_SET(nhp, message_enable, value != 0);
735 736
    }
    /* NUTAG_ENABLEMESSENGER(win_messenger_enable) */
737 738
    else if (tag == nutag_enablemessenger) {
      NHP_SET(nhp, win_messenger_enable, value != 0);
739 740 741
    }
#if 0
    /* NUTAG_MESSAGE_AUTOANSWER(message_auto_respond) */
742 743
    else if (tag == nutag_message_autoanwer) {
      NHP_SET(nhp, message_auto_respond, value);
744 745 746
    }
#endif
    /* NUTAG_CALLEE_CAPS(callee_caps) */
747 748
    else if (tag == nutag_callee_caps) {
      NHP_SET(nhp, callee_caps, value != 0);
749 750
    }
    /* NUTAG_MEDIA_FEATURES(media_features) */
751 752
    else if (tag == nutag_media_features) {
      NHP_SET(nhp, media_features, value != 0);
753 754
    }
    /* NUTAG_SERVICE_ROUTE_ENABLE(service_route_enable) */
755 756
    else if (tag == nutag_service_route_enable) {
      NHP_SET(nhp, service_route_enable, value != 0);
757 758
    }
    /* NUTAG_PATH_ENABLE(path_enable) */
759 760
    else if (tag == nutag_path_enable) {
      NHP_SET(nhp, path_enable, value != 0);
761
    }
762
    /* NUTAG_REFER_EXPIRES(refer_expires) */
763 764
    else if (tag == nutag_refer_expires) {
      NHP_SET(nhp, refer_expires, value);
765 766
    }
    /* NUTAG_REFER_WITH_ID(refer_with_id) */
767 768
    else if (tag == nutag_refer_with_id) {
      NHP_SET(nhp, refer_with_id, value != 0);
769
    }
770
    /* NUTAG_SUBSTATE(substate) */
771 772
    else if (tag == nutag_substate) {
      NHP_SET(nhp, substate, (int)value);
773 774
    }
    /* NUTAG_KEEPALIVE(keepalive) */
775 776
    else if (tag == nutag_keepalive) {
      NHP_SET(nhp, keepalive, (unsigned)value);
777 778
    }
    /* NUTAG_KEEPALIVE_STREAM(keepalive_stream) */
779 780
    else if (tag == nutag_keepalive_stream) {
      NHP_SET(nhp, keepalive_stream, (unsigned)value);
781 782
    }

783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
    /* NUTAG_SUPPORTED(feature) */
    /* SIPTAG_SUPPORTED_STR(supported_str) */
    /* SIPTAG_SUPPORTED(supported) */
    else if (tag == nutag_supported ||
	     tag == siptag_supported || 
	     tag == siptag_supported_str) {
      int ok;
      sip_supported_t *supported = NULL;

      ok = nhp_merge_lists(home, 
			   sip_supported_class, &supported, nhp->nhp_supported,
			   NHP_ISSET(nhp, supported), /* already set by tags */
			   tag == siptag_supported, /* dup it, don't make */
			   tag == nutag_supported, /* merge with old value */
			   t->t_value);
      if (ok < 0)
	return -1;
      else if (ok)
	NHP_SET(nhp, supported, supported);
802
    }
803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821
    /* NUTAG_ALLOW(allowing) */
    /* SIPTAG_ALLOW_STR(allow_str) */
    /* SIPTAG_ALLOW(allow) */
    else if (tag == nutag_allow ||
	     tag == siptag_allow_str ||
	     tag == siptag_allow) {
      int ok;
      sip_allow_t *allow = NULL;

      ok = nhp_merge_lists(home, 
			   sip_allow_class, &allow, nhp->nhp_allow,
			   NHP_ISSET(nhp, allow), /* already set by tags */
			   tag == siptag_allow, /* dup it, don't make */
			   tag == nutag_allow, /* merge with old value */
			   t->t_value);
      if (ok < 0)
	return -1;
      else if (ok)
	NHP_SET(nhp, allow, allow);
822
    }
823 824 825
    /* SIPTAG_USER_AGENT(user_agent) */
    else if (tag == siptag_user_agent) {
      NHP_SET_STR_BY_HEADER(nhp, user_agent, value);
826
    }
827 828 829 830 831
    /* SIPTAG_USER_AGENT_STR(user_agent_str) */
    else if (tag == siptag_user_agent_str && value != 0) {
      if (value == -1)
	value = 0;
      NHP_SET_STR(nhp, user_agent, value);
832
    }
833 834 835
    /* NUTAG_USER_AGENT(ua_name) */
    else if (tag == nutag_user_agent) {
      /* Add contents of NUTAG_USER_AGENT() to our distribution name */
836
      char const *str = (void *)value, *ua;
837

838 839 840 841
      if (str && !already_contains_package_name(str))
	ua = su_sprintf(home, "%s %s", str, NHP_USER_AGENT);
      else if (str)
	ua = su_strdup(home, str);
842 843 844 845
      else
	ua = su_strdup(home, NHP_USER_AGENT);

      NHP_SET(nhp, user_agent, ua);
846
    }
847 848 849
    /* SIPTAG_ORGANIZATION(organization) */
    else if (tag == siptag_organization) {
      NHP_SET_STR_BY_HEADER(nhp, organization, value);
850
    }
851 852 853 854 855
    /* SIPTAG_ORGANIZATION_STR(organization_str) */
    else if (tag == siptag_organization_str) {
      if (value == -1)
	value = 0;
      NHP_SET_STR(nhp, organization, value);
856
    }
857 858 859 860 861
    /* NUTAG_REGISTRAR(registrar) */
    else if (tag == nutag_registrar) {
      NHP_SET_STR_BY_URL(nhp, registrar, value);
      if (NHP_ISSET(nhp, registrar) && !str0cmp(nhp->nhp_registrar, "*"))
	NHP_SET_STR(nhp, registrar, 0);
862
    }
863 864 865
    /* NUTAG_INSTANCE(instance) */
    else if (tag == nutag_instance) {
      NHP_SET_STR(nhp, instance, value);
866
    }
867 868 869
    /* NUTAG_M_DISPLAY(m_display) */
    else if (tag == nutag_m_display) {
      NHP_SET_STR(nhp, m_display, value);
870
    }
871 872 873
    /* NUTAG_M_USERNAME(m_username) */
    else if (tag == nutag_m_username) {
      NHP_SET_STR(nhp, m_username, value);
874
    }
875 876 877
    /* NUTAG_M_PARAMS(m_params) */
    else if (tag == nutag_m_params) {
      NHP_SET_STR(nhp, m_params, value);
878
    }
879 880 881
    /* NUTAG_M_FEATURES(m_features) */
    else if (tag == nutag_m_features) {
      NHP_SET_STR(nhp, m_features, value);
882
    }
883 884 885
    /* NUTAG_OUTBOUND(outbound) */
    else if (tag == nutag_outbound) {
      NHP_SET_STR(nhp, outbound, value);
886
    }
887 888 889 890 891 892 893 894 895 896
    /* NUTAG_DETECT_NETWORK_UPDATES(detect_network_updates) */
    else if (global && tag == nutag_detect_network_updates) {
      int detector = (int)value;

      if (detector < NUA_NW_DETECT_NOTHING)
	detector = NUA_NW_DETECT_NOTHING;
      else if (detector > NUA_NW_DETECT_TRY_FULL)
	detector = NUA_NW_DETECT_TRY_FULL;

      NHP_SET(nhp, detect_network_updates, detector);
897
    }
898 899
  }

900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917
  return 0;
}

/** Merge (when needed) new values with old values. */
static int nhp_merge_lists(su_home_t *home,
			   msg_hclass_t *hc,
			   msg_list_t **return_new_list,
			   msg_list_t const *old_list,
			   int already_set,
			   int already_parsed,
			   int always_merge,
			   tag_value_t value)
{
  msg_list_t *list, *elems;

  if (value == -1) {
    *return_new_list = NULL;
    return 1;
918 919
  }

920 921 922 923 924 925
  if (value == 0) {
    if (!already_set && !always_merge) {
      *return_new_list = NULL;
      return 1;
    }
    return 0;
926 927
  }

928 929 930 931
  if (already_parsed) 
    elems = (void *)msg_header_dup_as(home, hc, (msg_header_t *)value);
  else
    elems = (void *)msg_header_make(home, hc, (char const *)value);
932

933 934 935 936
  if (!elems)
    return -1;

  list = (msg_list_t *)old_list;
937

938 939 940 941 942 943 944 945 946
  if (!already_set) {
    if (always_merge && list) {
      list = (void *)msg_header_dup_as(home, hc, (void *)old_list);
      if (!list)
	return -1;
    }
    else
      list = NULL;
  }
947

948 949 950
  if (!list) {
    *return_new_list = elems;
    return 1;
951 952
  }

953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
  /* Add contents to the new list to the old list */
  if (msg_params_join(home, (msg_param_t **)&list->k_items, elems->k_items,
		      2 /* prune */, 0 /* don't dup */) < 0)
    return -1;
  
  *return_new_list = 
    (msg_list_t *)msg_header_dup_as(home, hc, (msg_header_t *)list);
  if (!*return_new_list)
    return -1;

  msg_header_free(home, (msg_header_t *)list);
  msg_header_free(home, (msg_header_t *)elems);

  return 1;
}

static
970 971 972 973
nua_handle_preferences_t *nhp_move_params(su_home_t *home,
					  nua_handle_preferences_t *dst,
					  su_home_t *tmphome,
					  nua_handle_preferences_t const *src)
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
{
  /* Update prefs structure */
  nua_handle_preferences_t tbf[1];

  if (dst == NULL)
    dst = su_zalloc(home, sizeof *dst);
  if (dst == NULL)
    return NULL;
  if (su_home_move(home, tmphome) < 0)
    return NULL;

  *tbf = *dst;
  nhp_or_set(dst, src);

  /* Handle pointer items. Free changed ones and zap unset ones. */
#define NHP_ZAP_OVERRIDEN(tbf, nhp, pref)				\
  (((tbf)->nhp_set.nhb_##pref						\
    && (tbf)->nhp_##pref != (nhp)->nhp_##pref				\
    ? su_free(home, (void *)(tbf)->nhp_##pref) : (void)0),		\
   (void)(!(nhp)->nhp_set.nhb_##pref ? (nhp)->nhp_##pref = NULL : NULL))

  NHP_ZAP_OVERRIDEN(tbf, dst, soa_name);
  NHP_ZAP_OVERRIDEN(tbf, dst, registrar);
  NHP_ZAP_OVERRIDEN(tbf, dst, supported);
  NHP_ZAP_OVERRIDEN(tbf, dst, allow);
  NHP_ZAP_OVERRIDEN(tbf, dst, user_agent);
  NHP_ZAP_OVERRIDEN(tbf, dst, organization);
  NHP_ZAP_OVERRIDEN(tbf, dst, instance);
  NHP_ZAP_OVERRIDEN(tbf, dst, m_display);
  NHP_ZAP_OVERRIDEN(tbf, dst, m_username);
  NHP_ZAP_OVERRIDEN(tbf, dst, m_params);
  NHP_ZAP_OVERRIDEN(tbf, dst, m_features);
  NHP_ZAP_OVERRIDEN(tbf, dst, outbound);

  return dst;
}

static int nua_handle_tags_filter(tagi_t const *f, tagi_t const *t);
static int nua_handle_param_filter(tagi_t const *f, tagi_t const *t);

/** Save taglist to a handle */
1015
int nua_handle_save_tags(nua_handle_t *nh, tagi_t *tags)
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
{
  tagi_t const tagfilter[] = {
    { TAG_FILTER(nua_handle_tags_filter) },
    { TAG_NULL() }
  };
  tagi_t const paramfilter[] = {
    { TAG_FILTER(nua_handle_param_filter) },
    { TAG_NULL() }
  };

  /* Initialization parameters */
  url_string_t const *url = NULL;
  sip_to_t const *p_to = NULL;
  char const *to_str = NULL;
  sip_from_t from[1];
  sip_from_t const *p_from = NULL;
  char const *from_str = NULL;
  nua_handle_t *identity = NULL;

  tagi_t const *t;

  su_home_t tmphome[SU_HOME_AUTO_SIZE(1024)];

  int error;

  for (t = tags; t; t = tl_next(t)) {
    if (t->t_tag == NULL)
      break;
    /* SIPTAG_FROM_REF(p_from) */
    else if (t->t_tag == siptag_from) {
      p_from = (sip_from_t *)t->t_value, from_str = NULL;
    }
    /* SIPTAG_FROM_STR_REF(from_str) */
    else if (t->t_tag == siptag_from_str) {
      from_str = (char const *)t->t_value, p_from = NULL;
    }
    /* SIPTAG_TO_REF(p_to) */
    else if (t->t_tag == siptag_to) {
      p_to = (sip_to_t *)t->t_value, to_str = NULL;
    }
    /* SIPTAG_TO_STR_REF(to_str) */
    else if (t->t_tag == siptag_to_str) {
      to_str = (char const *)t->t_value, p_to = NULL;
    }
    /* NUTAG_IDENTITY_REF(identity) */
    else if (t->t_tag == nutag_identity) {
      identity = (nua_handle_t *)t->t_value;
    }
    /* NUTAG_URL_REF(url) */
    else if (t->t_tag == nutag_url) {
      url = (url_string_t *)t->t_value;
    }
    /* NUTAG_SIPS_URL_REF(url) */
    else if (t->t_tag == nutag_url) {
      url = (url_string_t *)t->t_value;
1071 1072 1073
    }
  }

1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
  su_home_auto(tmphome, sizeof tmphome);

  if (p_from)
    ;
  else if (from_str)
    p_from = sip_from_make(tmphome, from_str);
  else if (!p_from && nh->nh_nua->nua_from)
    *from = *nh->nh_nua->nua_from, from->a_params = NULL, p_from = from;
  else
    p_from = SIP_NONE;    /* XXX - why? */

  if (p_to)
    ;
  else if (to_str)
    p_to = sip_to_make(tmphome, to_str);
1089 1090 1091
  else if (url)
    p_to = sip_to_create(tmphome, url), 
      p_to ? sip_aor_strip((url_t*)p_to->a_url) : 0;
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  else
    p_to = SIP_NONE;
  
  if (p_to == NULL || p_from == NULL) {
    su_home_deinit(tmphome);
    return -1;
  }

  nh->nh_tags = 
    tl_filtered_tlist(nh->nh_home, tagfilter,
		      SIPTAG_FROM(p_from),
		      TAG_FILTER(nua_handle_tags_filter),
		      SIPTAG_TO(p_to),
		      TAG_FILTER(nua_handle_tags_filter),
		      TAG_NEXT(tags));

  nh->nh_ptags = 
    tl_filtered_tlist(nh->nh_home, paramfilter, TAG_NEXT(tags));

  error = nh->nh_tags == NULL || nh->nh_ptags == NULL;

  if (!error)
    tl_gets(nh->nh_tags,	/* These does not change while nh lives */
	    SIPTAG_FROM_REF(nh->nh_ds->ds_local),
	    SIPTAG_TO_REF(nh->nh_ds->ds_remote),
	    TAG_END());

  if (nh->nh_ptags && nh->nh_ptags->t_tag == NULL)
    su_free(nh->nh_home, nh->nh_ptags), nh->nh_ptags = NULL;
    
  if (identity)
    nh->nh_identity = nua_handle_ref(identity);

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  su_home_deinit(tmphome);

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  return -error;
}

/** Filter tags used for settings. */
static int nua_handle_param_filter(tagi_t const *f, tagi_t const *t)
{
  char const *ns;
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  if (!t || !t->t_tag)
    return 0;
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  if (t->t_tag == nutag_url || 
      t->t_tag == nutag_sips_url ||
      t->t_tag == nutag_identity)
    return 0;

  ns = t->t_tag->tt_ns; 
  if (!ns)
    return 0;
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  return strcmp(ns, "nua") == 0 && strcmp(ns, "soa") == 0;
}
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/** Filter tags stored permanently as taglist. */
static int nua_handle_tags_filter(tagi_t const *f, tagi_t const *t)
{
  tag_type_t tag;
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  if (!t || !t->t_tag)
    return 0;
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  tag = t->t_tag;
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  if (tag == tag_filter)
    return 0;
  
  /* Accept @From or @To only when they are followed by
     TAG_FILTER(nua_handle_tags_filter) */
  if (tag == siptag_from || tag == siptag_to) {
    t = tl_next(t);
    return t && t->t_tag == tag_filter && 
      t->t_value == (tag_value_t)nua_handle_tags_filter;
  }
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  if (tag == nutag_identity)
    return 0;
  if (tag == siptag_from_str)
    return 0;
  if (tag == siptag_to_str)
    return 0;
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  /** Ignore @CSeq, @RSeq, @RAck, @Timestamp, and @ContentLength */
  if (tag == siptag_cseq || tag == siptag_cseq_str)
    return 0;
  if (tag == siptag_rseq || tag == siptag_rseq_str)
    return 0;
  if (tag == siptag_rack || tag == siptag_rack_str)
    return 0;
  if (tag == siptag_timestamp || tag == siptag_timestamp_str)
    return 0;
  if (tag == siptag_content_length || tag == siptag_content_length_str)
    return 0;
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  return ! nua_handle_param_filter(f, t);
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}

static
int nua_stack_set_smime_params(nua_t *nua, tagi_t const *tags)
{
#if HAVE_SOFIA_SMIME
  int           smime_enable = nua->sm->sm_enable;
  int           smime_opt = nua->sm->sm_opt;
  int           smime_protection_mode = nua->sm->sm_protection_mode;
  char const   *smime_message_digest = NONE;
  char const   *smime_signature = NONE;
  char const   *smime_key_encryption = NONE;
  char const   *smime_message_encryption = NONE;
  char const   *smime_path = NONE;

  int n;

  n = tl_gets(tags,
	      NUTAG_SMIME_ENABLE_REF(smime_enable),
	      NUTAG_SMIME_OPT_REF(smime_opt),
	      NUTAG_SMIME_PROTECTION_MODE_REF(smime_protection_mode),
	      NUTAG_SMIME_MESSAGE_DIGEST_REF(smime_message_digest),
	      NUTAG_SMIME_SIGNATURE_REF(smime_signature),
	      NUTAG_SMIME_KEY_ENCRYPTION_REF(smime_key_encryption),
	      NUTAG_SMIME_MESSAGE_ENCRYPTION_REF(smime_message_encryption),
	      NUTAG_CERTIFICATE_DIR_REF(smime_path),
	      TAG_NULL());
  if (n <= 0)
    return n;

  /* XXX - all other S/MIME parameters? */
  return sm_set_params(nua->sm, smime_enable, smime_opt, 
		       smime_protection_mode, smime_path);
#endif

  return 0;
}

/**@fn void nua_get_params(nua_t *nua, tag_type_t tag, tag_value_t value, ...)
 *
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 * Get NUA parameters matching with the given filter.
 * The values of NUA parameters is returned in #nua_r_get_params event.
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 *
 * @param nua             Pointer to NUA stack object
 * @param tag, value, ... List of tagged parameters
 *
 * @return
 *     nothing
 *
 * @par Related tags:
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 *     TAG_ANY() \n
 *     otherwise same tags as nua_set_params()
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 *
 * @par Events:
 *     #nua_r_get_params
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 *
 * @par Examples
 * Find out default values of all parameters:
 * @code
 *    nua_get_params(nua, TAG_ANY(), TAG_END());
 * @endcode
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 */

/**@fn void nua_get_hparams(nua_handle_t *nh, tag_type_t tag, tag_value_t value, ...)
 * 
 * Get values of handle-specific parameters in nua_r_get_params event.
 *
 * Application will specify either expilicit list of tags it is interested
 * in, or a filter (at the moment, TAG_ANY()). The values are returned as a
 * list of tags in the nua_r_get_params event.
 *
 * @param nh              Pointer to operation handle
 * @param tag, value, ... List of tagged parameters
 *
 * The handle-specific parameters will contain only the parameters actually
 * modified by application, either by nua_set_hparams() or some other
 * handle-specific call. Currently, no NTA parameters are returned. They are
 * returned only when application asks for user-agent-level parameters using
 * either nua_get_params() or using default handle, eg.
 * @code
 * nua_get_hparams(nua_default(nua), TAG_ANY())
 * @endcode
 *
 * @return
 *     nothing
 *
 * @par Related tags:
 *     #TAG_ANY \n
 *     othervise same tags as nua_set_hparams()
 *
 * @par Events:
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 *     #nua_r_get_params
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 */

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/** @var nua_event_e::nua_r_get_params
 *
 * Answer to nua_get_params() or nua_get_hparams().
 *
 * @param nh     NULL
 * @param hmagic NULL
 * @param sip    NULL
 * @param tags   
 *   NUTAG_ALLOW() \n
 *   NUTAG_AUTOACK() \n
 *   NUTAG_AUTOALERT() \n
 *   NUTAG_AUTOANSWER() \n
 *   NUTAG_CALLEE_CAPS() \n
 *   NUTAG_DETECT_NETWORK_UPDATES() \n
 *   NUTAG_EARLY_ANSWER() \n
 *   NUTAG_EARLY_MEDIA() \n
 *   NUTAG_ENABLEINVITE() \n
 *   NUTAG_ENABLEMESSAGE() \n
 *   NUTAG_ENABLEMESSENGER() \n
 *   NUTAG_INSTANCE() \n
 *   NUTAG_INVITE_TIMER() \n
 *   NUTAG_KEEPALIVE() \n
 *   NUTAG_KEEPALIVE_STREAM() \n
 *   NUTAG_MAX_SUBSCRIPTIONS() \n
 *   NUTAG_MEDIA_ENABLE() \n
 *   NUTAG_MEDIA_FEATURES() \n
 *   NUTAG_MIN_SE() \n
 *   NUTAG_M_DISPLAY() \n
 *   NUTAG_M_FEATURES() \n
 *   NUTAG_M_PARAMS() \n
 *   NUTAG_M_USERNAME() \n
 *   NUTAG_ONLY183_100REL() \n
 *   NUTAG_OUTBOUND() \n
 *   NUTAG_PATH_ENABLE() \n
 *   NUTAG_REFER_EXPIRES() \n
 *   NUTAG_REFER_WITH_ID() \n
 *   NUTAG_REGISTRAR() \n
 *   NUTAG_RETRY_COUNT() \n
 *   NUTAG_SERVICE_ROUTE_ENABLE() \n
 *   NUTAG_SESSION_REFRESHER() \n
 *   NUTAG_SESSION_TIMER() \n
 *   NUTAG_SMIME_ENABLE() \n
 *   NUTAG_SMIME_KEY_ENCRYPTION() \n
 *   NUTAG_SMIME_MESSAGE_DIGEST() \n
 *   NUTAG_SMIME_MESSAGE_ENCRYPTION() \n
 *   NUTAG_SMIME_OPT() \n
 *   NUTAG_SMIME_PROTECTION_MODE() \n
 *   NUTAG_SMIME_SIGNATURE() \n
 *   NUTAG_SOA_NAME() \n
 *   NUTAG_SUBSTATE() \n
 *   NUTAG_SUPPORTED() \n
 *   NUTAG_UPDATE_REFRESH() \n
 *   NUTAG_USER_AGENT() \n
 *   SIPTAG_ALLOW() \n
 *   SIPTAG_ALLOW_STR() \n
 *   SIPTAG_FROM() \n
 *   SIPTAG_FROM_STR() \n
 *   SIPTAG_ORGANIZATION() \n
 *   SIPTAG_ORGANIZATION_STR() \n
 *   SIPTAG_SUPPORTED() \n
 *   SIPTAG_SUPPORTED_STR() \n
 *   SIPTAG_USER_AGENT() \n
 *   SIPTAG_USER_AGENT_STR() \n
 *               
 */

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