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freeswitch/libs/sofia-sip/libsofia-sip-ua/nua/nua_client.c

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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_client.c
* @brief Client transaction handling
*
* @author Pekka Pessi <Pekka.Pessi@nokia.com>
*
* @date Created: Tue Feb 3 16:10:45 EET 2009
*/
#include "config.h"
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <assert.h>
#include <sofia-sip/su_string.h>
#include <sofia-sip/su_tagarg.h>
#include <sofia-sip/su_tag_inline.h>
#include <sofia-sip/sip_util.h>
#include <sofia-sip/sip_protos.h>
#include <sofia-sip/sip_status.h>
#define SU_MSG_ARG_T struct nua_ee_data
#define SU_TIMER_ARG_T struct nua_client_request
#define NUA_SAVED_EVENT_T su_msg_t *
#define NUA_SAVED_SIGNAL_T su_msg_t *
#define NTA_AGENT_MAGIC_T struct nua_s
#define NTA_LEG_MAGIC_T struct nua_handle_s
#define NTA_OUTGOING_MAGIC_T struct nua_client_request
#include "nua_stack.h"
#include "nua_dialog.h"
#include "nua_client.h"
#include <sofia-sip/su_wait.h>
#if 0
su_inline int can_redirect(sip_contact_t const *m, sip_method_t method);
#endif
/**@internal
*
* @class nua_client_request
*
* Each handle has a queue of client-side requests; if a request is pending,
* a new request from API is added to the queue. After the request is
* complete, it is removed from the queue and destroyed by the default. The
* exception is the client requests bound to a dialog usage: they are saved
* and re-used when the dialog usage is refreshed (and sometimes when the
* usage is terminated).
*
* The client request is subclassed and its behaviour modified using virtual
* function table in #nua_client_methods_t.
*
* The first three methods (crm_template(), crm_init(), crm_send()) are
* called when the request is sent first time.
*
* The crm_template() is called if a template request message is needed (for
* example, in case of unregister, unsubscribe and unpublish, the template
* message is taken from the request establishing the usage).
*
* The crm_init() is called when the template message and dialog leg has
* been created and populated by the tags procided by the application. Its
* parameters msg and sip are pointer to the template request message that
* is saved in the nua_client_request::cr_msg field.
*
* The crm_send() is called with a copy of the template message that has
* been populated with all the fields included in the request, including
* @CSeq and @MaxForwards. The crm_send() function, such as
* nua_publish_client_request(), usually calls nua_base_client_trequest() that
* then creates the nta-level transaction.
*
* The response to the request is processed by crm_check_restart(), which
* modifies and restarts the request when needed (e.g., when negotiating
* expiration time). After the request has been suitably modified, e.g., the
* expiration time has been increased, the restart function calls
* nua_client_restart(), which restarts the request and relays the
* intermediate response to the application with nua_client_restart() and
* crm_report().
*
* The final responses are processed by crm_recv() and and preliminary ones
* by crm_preliminary(). All virtual functions should call
* nua_base_client_response() beside method-specific processing.
*
* The nua_base_client_response() relays the response to the application with
* nua_client_restart() and crm_report().
*
* @par Terminating Dialog Usages and Dialogs
*
* The response is marked as terminating with nua_client_set_terminating().
* When a terminating request completes the dialog usage is removed and the
* dialog is destroyed (unless there is an another active usage).
*/
static void nua_client_request_destroy(nua_client_request_t *cr);
static int nua_client_init_request0(nua_client_request_t *cr);
static int nua_client_request_try(nua_client_request_t *cr);
static int nua_client_request_sendmsg(nua_client_request_t *cr);
static void nua_client_restart_after(su_root_magic_t *magic,
su_timer_t *timer,
nua_client_request_t *cr);
/**Create a client request.
*
* @retval 0 if request is pending
* @retval > 0 if error event has been sent
* @retval < 0 upon an error
*/
int nua_client_create(nua_handle_t *nh,
int event,
nua_client_methods_t const *methods,
tagi_t const * const tags)
{
su_home_t *home = nh->nh_home;
nua_client_request_t *cr;
sip_method_t method;
char const *name;
method = methods->crm_method, name = methods->crm_method_name;
if (!name) {
tagi_t const *t = tl_find_last(tags, nutag_method);
if (t)
name = (char const *)t->t_value;
}
cr = su_zalloc(home, sizeof *cr + methods->crm_extra);
if (!cr) {
return nua_stack_event(nh->nh_nua, nh,
NULL,
(enum nua_event_e)event,
NUA_ERROR_AT(__FILE__, __LINE__),
NULL);
}
cr->cr_methods = methods;
cr->cr_event = event;
cr->cr_method = method;
cr->cr_method_name = name;
cr->cr_contactize = methods->crm_flags.target_refresh;
cr->cr_dialog = methods->crm_flags.create_dialog;
cr->cr_auto = 1;
if (su_msg_is_non_null(nh->nh_nua->nua_signal)) {
nua_event_data_t *e = su_msg_data(nh->nh_nua->nua_signal)->ee_data;
if (tags == e->e_tags && event == e->e_event) {
cr->cr_auto = 0;
if (tags) {
nua_move_signal(cr->cr_signal, nh->nh_nua->nua_signal);
if (cr->cr_signal[0]) {
/* Steal reference from signal */
cr->cr_owner = e->e_nh, e->e_nh = NULL;
cr->cr_tags = tags;
}
}
}
}
if (cr->cr_owner == NULL)
cr->cr_owner = nua_handle_ref(nh);
if (tags && cr->cr_tags == NULL)
cr->cr_tags = tl_tlist(nh->nh_home, TAG_NEXT(tags));
#if HAVE_MEMLEAK_LOG
SU_DEBUG_0(("%p %s() for %s\n", cr, __func__, cr->cr_methods->crm_method_name));
#endif
if (nua_client_request_queue(cr))
return 0;
return nua_client_init_request(cr);
}
int nua_client_tcreate(nua_handle_t *nh,
int event,
nua_client_methods_t const *methods,
tag_type_t tag, tag_value_t value, ...)
{
int retval;
ta_list ta;
ta_start(ta, tag, value);
retval = nua_client_create(nh, event, methods, ta_args(ta));
ta_end(ta);
return retval;
}
#if HAVE_MEMLEAK_LOG
nua_client_request_t *
nua_client_request_ref_by(nua_client_request_t *cr,
char const *where, unsigned line, char const *who)
{
SU_DEBUG_0(("%p ref %s to %u by %s:%u: %s()\n",
cr, cr->cr_methods->crm_method_name,
++(cr->cr_refs), where, line, who));
return cr;
}
int nua_client_request_unref_by(nua_client_request_t *cr,
char const *where, unsigned line, char const *who)
{
SU_DEBUG_0(("%p unref %s to %u by %s:%u: %s()\n",
cr, cr->cr_methods->crm_method_name,
cr->cr_refs - 1, where, line, who));
if (cr->cr_refs > 1) {
cr->cr_refs--;
return 0;
}
else {
cr->cr_refs = 0;
nua_client_request_destroy(cr);
return 1;
}
}
#else
nua_client_request_t *nua_client_request_ref(nua_client_request_t *cr)
{
cr->cr_refs++;
return cr;
}
int nua_client_request_unref(nua_client_request_t *cr)
{
if (cr->cr_refs > 1) {
cr->cr_refs--;
return 0;
}
else {
cr->cr_refs = 0;
nua_client_request_destroy(cr);
return 1;
}
}
#endif
int nua_client_request_queue(nua_client_request_t *cr)
{
int queued = 0;
nua_client_request_t **queue = &cr->cr_owner->nh_ds->ds_cr;
assert(cr->cr_prev == NULL && cr->cr_next == NULL);
cr->cr_status = 0;
nua_client_request_ref(cr);
if (cr->cr_method != sip_method_invite &&
cr->cr_method != sip_method_cancel) {
while (*queue) {
if ((*queue)->cr_method == sip_method_invite ||
(*queue)->cr_method == sip_method_cancel)
break;
queue = &(*queue)->cr_next;
queued = 1;
}
}
else {
while (*queue) {
queue = &(*queue)->cr_next;
if (cr->cr_method == sip_method_invite)
queued = 1;
}
}
if ((cr->cr_next = *queue))
cr->cr_next->cr_prev = &cr->cr_next;
cr->cr_prev = queue, *queue = cr;
return queued;
}
int
nua_client_request_remove(nua_client_request_t *cr)
{
int retval = 0;
int in_queue = cr->cr_prev != NULL;
if (in_queue) {
if ((*cr->cr_prev = cr->cr_next))
cr->cr_next->cr_prev = cr->cr_prev;
}
cr->cr_prev = NULL, cr->cr_next = NULL;
if (cr->cr_timer) {
su_timer_destroy(cr->cr_timer), cr->cr_timer = NULL;
retval = nua_client_request_unref(cr);
}
if (!in_queue)
return retval;
return nua_client_request_unref(cr);
}
int
nua_client_request_clean(nua_client_request_t *cr)
{
if (cr->cr_orq) {
nta_outgoing_destroy(cr->cr_orq), cr->cr_orq = NULL, cr->cr_acked = 0;
return nua_client_request_unref(cr);
}
return 0;
}
int
nua_client_request_complete(nua_client_request_t *cr)
{
if (cr->cr_orq) {
nua_client_request_ref(cr);
if (cr->cr_methods->crm_complete)
/* Calls nua_invite_client_complete() */
cr->cr_methods->crm_complete(cr);
nua_client_request_clean(cr);
if (nua_client_request_unref(cr))
return 1;
}
return nua_client_request_remove(cr);
}
static void
nua_client_request_destroy(nua_client_request_t *cr)
{
nua_handle_t *nh;
if (cr == NULL)
return;
/* Possible references: */
assert(cr->cr_prev == NULL); /* queue */
assert(cr->cr_orq == NULL); /* transaction callback */
assert(cr->cr_timer == NULL); /* timer callback */
nh = cr->cr_owner;
nua_destroy_signal(cr->cr_signal);
nua_client_bind(cr, NULL);
#if HAVE_MEMLEAK_LOG
SU_DEBUG_0(("%p %s for %s\n", cr, __func__, cr->cr_methods->crm_method_name));
#endif
if (cr->cr_msg)
msg_destroy(cr->cr_msg);
cr->cr_msg = NULL, cr->cr_sip = NULL;
if (cr->cr_orq)
nta_outgoing_destroy(cr->cr_orq), cr->cr_orq = NULL;
if (cr->cr_target)
su_free(nh->nh_home, cr->cr_target);
su_free(nh->nh_home, cr);
nua_handle_unref(nh);
}
/** Bind client request to a dialog usage */
int nua_client_bind(nua_client_request_t *cr, nua_dialog_usage_t *du)
{
assert(cr);
if (cr == NULL)
return -1;
if (du == NULL) {
du = cr->cr_usage;
cr->cr_usage = NULL;
if (du && du->du_cr == cr) {
du->du_cr = NULL;
nua_client_request_unref(cr);
}
return 0;
}
if (du->du_cr && cr == du->du_cr)
return 0;
if (du->du_cr) {
nua_client_bind(du->du_cr, NULL);
}
du->du_cr = nua_client_request_ref(cr), cr->cr_usage = du;
return 0;
}
/** Check if client request is in progress.
*
* A client request is in progress, if
* 1) it has actual transaction going on
* 2) it is waiting credentials from application
* 3) it is waiting for Retry-After timer
*/
int
nua_client_request_in_progress(nua_client_request_t const *cr)
{
return cr &&
(cr->cr_orq || cr->cr_wait_for_cred || cr->cr_timer);
}
/**Initialize client request for sending.
*
* This function is called when the request is taken from queue and sent.
*
* @retval 0 if request is pending
* @retval >=1 if error event has been sent
*/
int nua_client_init_request(nua_client_request_t *cr)
{
int retval;
nua_client_request_ref(cr);
retval = nua_client_init_request0(cr);
nua_client_request_unref(cr);
return retval;
}
/**Initialize client request for sending.
*
* This function is called when the request is taken from queue and sent.
*
* @retval 0 if request is pending
* @retval >=1 if error event has been sent
*/
static
int nua_client_init_request0(nua_client_request_t *cr)
{
nua_handle_t *nh = cr->cr_owner;
nua_t *nua = nh->nh_nua;
nua_dialog_state_t *ds = nh->nh_ds;
msg_t *msg = NULL;
sip_t *sip;
url_string_t const *url = NULL;
tagi_t const *t;
int has_contact = 0;
int error = 0;
if (!cr->cr_method_name)
return nua_client_return(cr, NUA_ERROR_AT(__FILE__, __LINE__), NULL);
if (cr->cr_msg)
return nua_client_request_try(cr);
cr->cr_answer_recv = 0, cr->cr_offer_sent = 0;
cr->cr_offer_recv = 0, cr->cr_answer_sent = 0;
cr->cr_terminated = 0, cr->cr_graceful = 0;
nua_stack_init_handle(nua, nh, cr->cr_tags);
if (cr->cr_method == sip_method_cancel) {
if (cr->cr_methods->crm_init) {
error = cr->cr_methods->crm_init(cr, NULL, NULL, cr->cr_tags);
if (error)
return error;
}
if (cr->cr_methods->crm_send)
return cr->cr_methods->crm_send(cr, NULL, NULL, cr->cr_tags);
else
return nua_base_client_request(cr, NULL, NULL, cr->cr_tags);
}
if (!cr->cr_methods->crm_template ||
cr->cr_methods->crm_template(cr, &msg, cr->cr_tags) == 0)
msg = nua_client_request_template(cr);
sip = sip_object(msg);
if (!sip)
return nua_client_return(cr, NUA_ERROR_AT(__FILE__, __LINE__), msg);
if (nh->nh_tags) {
for (t = nh->nh_tags; t; t = t_next(t)) {
if (t->t_tag == siptag_contact ||
t->t_tag == siptag_contact_str)
has_contact = 1;
else if (t->t_tag == nutag_url)
url = (url_string_t const *)t->t_value;
}
}
/**@par Populating SIP Request Message with Tagged Arguments
*
* The tagged arguments can be used to pass values for any SIP headers
* to the stack. When the INVITE message (or any other SIP message) is
* created, the tagged values saved with nua_handle() are used first,
* next the tagged values given with the operation (nua_invite()) are
* added.
*
* 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.,
* @Subject. However, if the SIP header can consist of multiple lines or
* header fields separated by comma, e.g., @Accept, all the tagged
* values are concatenated.
*
* However, if a tag value is #SIP_NONE (-1 casted as a void pointer),
* the values from previous tags are ignored.
*/
for (t = cr->cr_tags; t; t = t_next(t)) {
if (t->t_tag == siptag_contact ||
t->t_tag == siptag_contact_str)
has_contact = 1;
else if (t->t_tag == nutag_url)
url = (url_string_t const *)t->t_value;
else if (t->t_tag == nutag_dialog) {
cr->cr_dialog = t->t_value > 1;
cr->cr_contactize = t->t_value >= 1;
}
else if (t->t_tag == nutag_auth && t->t_value) {
/* XXX ignoring errors */
if (nh->nh_auth)
auc_credentials(&nh->nh_auth, nh->nh_home, (char *)t->t_value);
}
}
if (cr->cr_method == sip_method_register && url == NULL)
url = (url_string_t const *)NH_PGET(nh, registrar);
if ((t = cr->cr_tags)) {
if (sip_add_tagis(msg, sip, &t) < 0)
return nua_client_return(cr, NUA_ERROR_AT(__FILE__, __LINE__), msg);
}
/**
* Now, the target URI for the request needs to be determined.
*
* For initial requests, values from tags are used. If NUTAG_URL() is
* given, it is used as target URI. Otherwise, if SIPTAG_TO() is given,
* it is used as target URI. If neither is given, the complete request
* line already specified using SIPTAG_REQUEST() or SIPTAG_REQUEST_STR()
* is used. At this point, the target URI is stored in the request line,
* together with method name and protocol version ("SIP/2.0"). The
* initial dialog information is also created: @CallID, @CSeq headers
* are generated, if they do not exist, and a tag is added to the @From
* header.
*/
if (!ds->ds_leg) {
if (ds->ds_remote_tag && ds->ds_remote_tag[0] &&
sip_to_tag(nh->nh_home, sip->sip_to, ds->ds_remote_tag) < 0)
return nua_client_return(cr, NUA_ERROR_AT(__FILE__, __LINE__), msg);
if (sip->sip_from == NULL &&
sip_add_dup(msg, sip, (sip_header_t *)nua->nua_from) < 0)
return nua_client_return(cr, NUA_ERROR_AT(__FILE__, __LINE__), msg);
if (sip->sip_to == NULL && cr->cr_method == sip_method_register &&
sip_add_dup_as(msg, sip, sip_to_class,
(sip_header_t *)sip->sip_from) < 0) {
return nua_client_return(cr, NUA_ERROR_AT(__FILE__, __LINE__), msg);
}
}
else {
if (ds->ds_route)
url = NULL;
}
if (url && nua_client_set_target(cr, (url_t *)url) < 0)
return nua_client_return(cr, NUA_ERROR_AT(__FILE__, __LINE__), msg);
cr->cr_has_contact = has_contact;
if (cr->cr_methods->crm_init) {
error = cr->cr_methods->crm_init(cr, msg, sip, cr->cr_tags);
if (error < -1)
msg = NULL;
if (error < 0)
return nua_client_return(cr, NUA_ERROR_AT(__FILE__, __LINE__), msg);
if (error != 0)
return error;
}
cr->cr_msg = msg;
cr->cr_sip = sip;
return nua_client_request_try(cr);
}
msg_t *nua_client_request_template(nua_client_request_t *cr)
{
nua_handle_t *nh = cr->cr_owner;
nua_t *nua = nh->nh_nua;
nua_dialog_state_t *ds = nh->nh_ds;
msg_t *msg = nta_msg_create(nua->nua_nta, 0);
sip_t *sip = sip_object(msg);
if (!sip)
return NULL;
if (nh->nh_tags) {
tagi_t const *t = nh->nh_tags;
/* Use the From header from the dialog.
If From is set, it is always first tag in the handle */
if (ds->ds_leg && t->t_tag == siptag_from)
t++;
/* When the INVITE message (or any other SIP message) is
* created, the tagged values saved with nua_handle() are used first. */
sip_add_tagis(msg, sip, &t);
}
return msg;
}
/** Restart the request message.
*
* A restarted request has not been completed successfully.
*
* @retval 0 if request is pending
* @retval >=1 if error event has been sent
*/
int nua_client_restart_request(nua_client_request_t *cr,
int terminating,
tagi_t const *tags)
{
if (cr) {
assert(nua_client_is_queued(cr));
if (tags && cr->cr_msg)
if (sip_add_tagis(cr->cr_msg, NULL, &tags) < 0)
/* XXX */;
nua_client_set_terminating(cr, terminating);
return nua_client_request_try(cr);
}
return 0;
}
/** Resend the request message.
*
* A resent request has completed once successfully - restarted has not.
*
* @retval 0 if request is pending
* @retval >=1 if error event has been sent
*/
int nua_client_resend_request(nua_client_request_t *cr,
int terminating)
{
if (cr) {
cr->cr_retry_count = 0;
cr->cr_challenged = 0;
if (nua_client_is_queued(cr)) {
if (terminating)
cr->cr_graceful = 1;
return 0;
}
if (terminating)
nua_client_set_terminating(cr, terminating);
if (nua_client_request_queue(cr))
return 0;
if (nua_dialog_is_reporting(cr->cr_owner->nh_ds))
return 0;
return nua_client_request_try(cr);
}
return 0;
}
/** Send a request message.
*
* If an error occurs, send error event to the application.
*
* @retval 0 if request is pending
* @retval >=1 if error event has been sent
*/
static
int nua_client_request_try(nua_client_request_t *cr)
{
int error = nua_client_request_sendmsg(cr);
if (error < 0)
error = nua_client_response(cr, NUA_ERROR_AT(__FILE__, __LINE__), NULL);
return error;
}
/**Send a request message.
*
* @retval 0 if request is pending
* @retval >=1 if error event has been sent
* @retval < 0 if no error event has been sent
*/
static
int nua_client_request_sendmsg(nua_client_request_t *cr)
{
nua_handle_t *nh = cr->cr_owner;
nua_dialog_state_t *ds = nh->nh_ds;
sip_method_t method = cr->cr_method;
char const *name = cr->cr_method_name;
url_string_t const *url = (url_string_t *)cr->cr_target;
nta_leg_t *leg;
msg_t *msg;
sip_t *sip;
int error;
assert(cr->cr_orq == NULL);
cr->cr_offer_sent = cr->cr_answer_recv = 0;
cr->cr_offer_recv = cr->cr_answer_sent = 0;
if (!ds->ds_leg && cr->cr_dialog) {
ds->ds_leg = nta_leg_tcreate(nh->nh_nua->nua_nta,
nua_stack_process_request, nh,
SIPTAG_CALL_ID(cr->cr_sip->sip_call_id),
SIPTAG_FROM(cr->cr_sip->sip_from),
SIPTAG_TO(cr->cr_sip->sip_to),
SIPTAG_CSEQ(cr->cr_sip->sip_cseq),
TAG_END());
if (!ds->ds_leg)
return -1;
}
if (cr->cr_sip->sip_from && ds->ds_leg) {
if (cr->cr_sip->sip_from->a_tag == NULL) {
if (sip_from_tag(msg_home(cr->cr_msg), cr->cr_sip->sip_from,
nta_leg_tag(ds->ds_leg, NULL)) < 0) {
return -1;
}
}
}
cr->cr_retry_count++;
if (ds->ds_leg)
leg = ds->ds_leg;
else
leg = nh->nh_nua->nua_dhandle->nh_ds->ds_leg; /* Default leg */
msg = msg_copy(cr->cr_msg), sip = sip_object(msg);
if (msg == NULL)
return -1;
if (nua_dialog_is_established(ds)) {
while (sip->sip_route)
sip_route_remove(msg, sip);
}
else if (!ds->ds_route) {
sip_route_t *initial_route = NH_PGET(nh, initial_route);
if (initial_route) {
initial_route = sip_route_dup(msg_home(msg), initial_route);
if (!initial_route) return -1;
msg_header_prepend(msg, (msg_pub_t*)sip,
/* This should be
(msg_header_t **)&sip->sip_route
* but directly casting pointer &sip->sip_route gives
* spurious type-punning warning */
(msg_header_t **)((char *)sip + offsetof(sip_t, sip_route)),
(msg_header_t *)initial_route);
}
}
/**
* For in-dialog requests, the request URI is taken from the @Contact
* header received from the remote party during dialog establishment,
* and the NUTAG_URL() is ignored.
*
* Also, the @CallID and @CSeq headers and @From and @To tags are
* generated based on the dialog information and added to the request.
* If the dialog has a route, it is added to the request, too.
*/
if (nta_msg_request_complete(msg, leg, method, name, url) < 0) {
msg_destroy(msg);
return -1;
}
/**@MaxForwards header (with default value set by NTATAG_MAX_FORWARDS()) is
* also added now, if it does not exist.
*/
if (!ds->ds_remote)
ds->ds_remote = sip_to_dup(nh->nh_home, sip->sip_to);
if (!ds->ds_local)
ds->ds_local = sip_from_dup(nh->nh_home, sip->sip_from);
/**
* Next, values previously set with nua_set_params() or nua_set_hparams()
* are used: @Allow, @Supported, @Organization, @UserAgent and
* @AllowEvents headers are added to the request if they are not already
* set.
*/
if (!sip->sip_allow)
sip_add_dup(msg, sip, (sip_header_t*)NH_PGET(nh, allow));
if (!sip->sip_supported && NH_PGET(nh, supported))
sip_add_dup(msg, sip, (sip_header_t *)NH_PGET(nh, supported));
if (method == sip_method_register && NH_PGET(nh, path_enable) &&
!sip_has_feature(sip->sip_supported, "path") &&
!sip_has_feature(sip->sip_require, "path"))
sip_add_make(msg, sip, sip_supported_class, "path");
if (!sip->sip_organization && NH_PGET(nh, organization))
sip_add_make(msg, sip, sip_organization_class, NH_PGET(nh, organization));
if (!sip->sip_user_agent && NH_PGET(nh, user_agent))
sip_add_make(msg, sip, sip_user_agent_class, NH_PGET(nh, user_agent));
if (!sip->sip_via && NH_PGET(nh, via))
sip_add_make(msg, sip, sip_via_class, NH_PGET(nh, via));
/** Any node implementing one or more event packages SHOULD include an
* appropriate @AllowEvents header indicating all supported events in
* all methods which initiate dialogs and their responses (such as
* INVITE) and OPTIONS responses.
*/
if (!sip->sip_allow_events &&
NH_PGET(nh, allow_events) &&
(method == sip_method_notify || /* Always in NOTIFY */
(!ds->ds_remote_tag && /* And in initial requests */
(method == sip_method_subscribe || method == sip_method_refer ||
method == sip_method_options ||
method == sip_method_invite))))
sip_add_dup(msg, sip, (void *)NH_PGET(nh, allow_events));
/**
* Next, the stack generates a @Contact header for the request (unless
* the application already gave a @Contact header or it does not want to
* use @Contact and indicates that by including SIPTAG_CONTACT(NULL) or
* SIPTAG_CONTACT(SIP_NONE) in the tagged parameters.) If the
* application has registered the URI in @From header, the @Contact
* header used with registration is used. Otherwise, the @Contact header
* is generated from the local IP address and port number.
*/
/**For the initial requests, @ServiceRoute set that was received from the
* registrar is also added to the request message.
*/
if (cr->cr_method != sip_method_register) {
if (cr->cr_contactize && cr->cr_has_contact) {
sip_contact_t *ltarget = sip_contact_dup(nh->nh_home, sip->sip_contact);
if (ds->ds_ltarget)
msg_header_free(nh->nh_home, (msg_header_t *)ds->ds_ltarget);
ds->ds_ltarget = ltarget;
}
if (ds->ds_ltarget && !cr->cr_has_contact)
sip_add_dup(msg, sip, (sip_header_t *)ds->ds_ltarget);
/*
FS-4102
It was decided to comment out this code because it does not appear to make sense
Dec 22, 2016
if (nua_registration_add_contact_to_request(nh, msg, sip,
cr->cr_contactize &&
!cr->cr_has_contact &&
!ds->ds_ltarget,
!ds->ds_route) < 0) {
msg_destroy(msg);
return -1;
}
*/
}
cr->cr_wait_for_cred = 0;
if (cr->cr_methods->crm_send)
error = cr->cr_methods->crm_send(cr, msg, sip, NULL);
else
error = nua_base_client_request(cr, msg, sip, NULL);
if (error == -1)
msg_destroy(msg);
return error;
}
/**Add tags to request message and send it,
*
* @retval 0 success
* @retval -1 if error occurred, but event has not been sent
* @retval -2 if error occurred, event has not been sent,
* and @a msg has been destroyed
* @retval >=1 if error event has been sent
*/
int nua_base_client_trequest(nua_client_request_t *cr,
msg_t *msg, sip_t *sip,
tag_type_t tag, tag_value_t value, ...)
{
int retval;
ta_list ta;
ta_start(ta, tag, value);
retval = nua_base_client_request(cr, msg, sip, ta_args(ta));
ta_end(ta);
return retval;
}
/** Send request.
*
* @retval 0 success
* @retval -1 if error occurred, but event has not been sent,
* and caller has to destroy request message @ msg
* @retval -2 if error occurred, event has not been sent
* @retval >=1 if error event has been sent
*/
int nua_base_client_request(nua_client_request_t *cr, msg_t *msg, sip_t *sip,
tagi_t const *tags)
{
nua_handle_t *nh = cr->cr_owner;
int proxy_is_set = NH_PISSET(nh, proxy);
url_string_t * proxy = NH_PGET(nh, proxy);
if (nh->nh_auth) {
if (cr->cr_challenged ||
NH_PGET(nh, auth_cache) == nua_auth_cache_dialog) {
if (auc_authorize(&nh->nh_auth, msg, sip) < 0)
return nua_client_return(cr, 900, "Cannot add credentials", msg);
}
}
cr->cr_seq = sip->sip_cseq->cs_seq; /* Save last sequence number */
assert(cr->cr_orq == NULL);
cr->cr_orq = nta_outgoing_mcreate(nh->nh_nua->nua_nta,
nua_client_orq_response,
nua_client_request_ref(cr),
NULL,
msg,
TAG_IF(proxy_is_set,
NTATAG_DEFAULT_PROXY(proxy)),
TAG_NEXT(tags));
if (cr->cr_orq == NULL) {
nua_client_request_unref(cr);
return -1;
}
return 0;
}
/** Callback for nta client transaction */
int
nua_client_orq_response(nua_client_request_t *cr,
nta_outgoing_t *orq,
sip_t const *sip)
{
int status;
char const *phrase;
if (sip && sip->sip_status) {
status = sip->sip_status->st_status;
phrase = sip->sip_status->st_phrase;
}
else {
status = nta_outgoing_status(orq);
phrase = "";
}
nua_client_response(cr, status, phrase, sip);
return 0;
}
/**Return response to the client request.
*
* Return a response generated by the stack. This function is used to return
* a error response within @a nua_client_methods_t#crm_init or @a
* nua_client_methods_t#crm_send functions. It takes care of disposing the @a
* to_be_destroyed that cannot be sent.
*
* @retval 0 if response event was preliminary
* @retval 1 if response event was final
* @retval 2 if response event destroyed the handle, too.
*/
int nua_client_return(nua_client_request_t *cr,
int status,
char const *phrase,
msg_t *to_be_destroyed)
{
if (to_be_destroyed)
msg_destroy(to_be_destroyed);
nua_client_response(cr, status, phrase, NULL);
return 1;
}
/** Process response to the client request.
*
* The response can be generated by the stack (@a sip is NULL) or
* returned by the remote server.
*
* @retval 0 if response event was preliminary
* @retval 1 if response event was final
* @retval 2 if response event destroyed the handle, too.
*/
int nua_client_response(nua_client_request_t *cr,
int status,
char const *phrase,
sip_t const *sip)
{
nua_handle_t *nh = cr->cr_owner;
nua_dialog_usage_t *du = cr->cr_usage;
int retval = 0;
if (cr->cr_restarting)
return 0;
if (cr->cr_status == 200 && status < 200) { // ignore 183 follows 200
return 0;
}
nua_client_request_ref(cr);
cr->cr_status = status;
cr->cr_phrase = phrase;
if (status < 200) {
/* Xyzzy */
}
else if (sip && nua_client_check_restart(cr, status, phrase, sip)) {
nua_client_request_unref(cr);
return 0;
}
else if (status < 300) {
if (cr->cr_terminating) {
cr->cr_terminated = 1;
}
else {
if (sip) {
if (cr->cr_contactize)
nua_dialog_uac_route(nh, nh->nh_ds, sip, 1, cr->cr_initial);
nua_dialog_store_peer_info(nh, nh->nh_ds, sip);
}
if (du && du->du_cr == cr)
du->du_ready = 1;
}
}
else {
sip_method_t method = cr->cr_method;
int terminated, graceful = 1;
if (status < 700) {
terminated = sip_response_terminates_dialog(status, method, &graceful);
if (terminated && !cr->cr_initial) {
terminated = 0, graceful = 1;
}
} else {
/* XXX - terminate usage by all internal error responses */
terminated = 0, graceful = 1;
}
if (terminated < 0)
cr->cr_terminated = terminated;
else if (cr->cr_terminating || terminated)
cr->cr_terminated = 1;
else if (graceful)
cr->cr_graceful = 1;
}
if (status < 200) {
if (cr->cr_methods->crm_preliminary)
cr->cr_methods->crm_preliminary(cr, status, phrase, sip);
else
nua_base_client_response(cr, status, phrase, sip, NULL);
cr->cr_phrase = NULL;
}
else {
if (cr->cr_methods->crm_recv)
retval = cr->cr_methods->crm_recv(cr, status, phrase, sip);
else
retval = nua_base_client_response(cr, status, phrase, sip, NULL);
}
nua_client_request_unref(cr);
return retval;
}
/** Check if request should be restarted.
*
* @retval 1 if restarted or waiting for restart
* @retval 0 otherwise
*/
int nua_client_check_restart(nua_client_request_t *cr,
int status,
char const *phrase,
sip_t const *sip)
{
nua_handle_t *nh;
assert(cr && status >= 200 && phrase && sip);
nh = cr->cr_owner;
if (cr->cr_retry_count > NH_PGET(nh, retry_count))
return 0;
if (cr->cr_methods->crm_check_restart)
return cr->cr_methods->crm_check_restart(cr, status, phrase, sip);
else
return nua_base_client_check_restart(cr, status, phrase, sip);
}
int nua_base_client_check_restart(nua_client_request_t *cr,
int status,
char const *phrase,
sip_t const *sip)
{
nua_handle_t *nh = cr->cr_owner;
nta_outgoing_t *orq;
#if 0
if (status == 302 || status == 305) {
sip_route_t r[1];
if (!can_redirect(sip->sip_contact, cr->cr_method))
return 0;
switch (status) {
case 302:
if (nua_dialog_zap(nh, nh->nh_ds) == 0 &&
nua_client_set_target(cr, sip->sip_contact->m_url) >= 0)
return nua_client_restart(cr, 100, "Redirected");
break;
case 305:
sip_route_init(r);
*r->r_url = *sip->sip_contact->m_url;
if (nua_dialog_zap(nh, nh->nh_ds) == 0 &&
sip_add_dup(cr->cr_msg, cr->cr_sip, (sip_header_t *)r) >= 0)
return nua_client_restart(cr, 100, "Redirected via a proxy");
break;
default:
break;
}
}
#endif
if (status == 423) {
unsigned my_expires = 0;
if (cr->cr_sip->sip_expires)
my_expires = cr->cr_sip->sip_expires->ex_delta;
if (sip->sip_min_expires &&
sip->sip_min_expires->me_delta > my_expires) {
sip_expires_t ex[1];
sip_expires_init(ex);
ex->ex_delta = sip->sip_min_expires->me_delta;
if (sip_add_dup(cr->cr_msg, NULL, (sip_header_t *)ex) < 0)
return 0;
return nua_client_restart(cr, 100, "Re-Negotiating Expiration");
}
}
if (status == 403) {
if (nh->nh_auth) {
/* Bad username/password */
SU_DEBUG_7(("nua(%p): bad credentials, clearing them\n", (void *)nh));
auc_clear_credentials(&nh->nh_auth, NULL, NULL);
}
}
if ((status == 401 && sip->sip_www_authenticate) ||
(status == 407 && sip->sip_proxy_authenticate)) {
int server = 0, proxy = 0;
if (sip->sip_www_authenticate)
server = auc_challenge(&nh->nh_auth, nh->nh_home,
sip->sip_www_authenticate,
sip_authorization_class);
if (sip->sip_proxy_authenticate)
proxy = auc_challenge(&nh->nh_auth, nh->nh_home,
sip->sip_proxy_authenticate,
sip_proxy_authorization_class);
if (server >= 0 && proxy >= 0) {
int invalid = cr->cr_challenged && server + proxy == 0;
cr->cr_challenged = 1;
if (invalid) {
/* Bad username/password */
SU_DEBUG_7(("nua(%p): bad credentials, clearing them\n", (void *)nh));
auc_clear_credentials(&nh->nh_auth, NULL, NULL);
} else if (auc_has_authorization(&nh->nh_auth)) {
return nua_client_restart(cr, 100, "Request Authorized by Cache");
}
orq = cr->cr_orq, cr->cr_orq = NULL;
cr->cr_waiting = cr->cr_wait_for_cred = 1;
nua_client_report(cr, status, phrase, NULL, orq, NULL);
nta_outgoing_destroy(orq);
cr->cr_status = 0, cr->cr_phrase = NULL;
nua_client_request_unref(cr);
return 1;
}
}
/* GriGiu : RFC-3261 status supported Retry-After */
if ( (status == 404 || status == 413 || status == 480 || status == 486 ||
status == 500 || status == 503 ||
status == 600 || status == 603) &&
sip->sip_retry_after &&
NH_PGET(nh, retry_after_enable) &&
sip->sip_retry_after->af_delta < 3200) {
su_timer_t *timer;
char phrase[18]; /* Retry After XXXX\0 */
timer = su_timer_create(su_root_task(nh->nh_nua->nua_root), 0);
if (su_timer_set_interval(timer, nua_client_restart_after, cr,
sip->sip_retry_after->af_delta * 1000) < 0) {
su_timer_destroy(timer);
return 0; /* Too bad */
}
cr->cr_timer = timer; /* This takes over cr reference from orq */
snprintf(phrase, sizeof phrase, "Retry After %u",
(unsigned)sip->sip_retry_after->af_delta);
orq = cr->cr_orq, cr->cr_orq = NULL;
cr->cr_waiting = 1;
nua_client_report(cr, 100, phrase, NULL, orq, NULL);
nta_outgoing_destroy(orq);
cr->cr_status = 0, cr->cr_phrase = NULL;
return 1;
}
return 0; /* This was a final response that cannot be restarted. */
}
#if 0
su_inline
int can_redirect(sip_contact_t const *m, sip_method_t method)
{
if (m && m->m_url->url_host) {
enum url_type_e type = (enum url_type_e)m->m_url->url_type;
return
type == url_sip ||
type == url_sips ||
(type == url_tel &&
(method == sip_method_invite || method == sip_method_message)) ||
(type == url_im && method == sip_method_message) ||
(type == url_pres && method == sip_method_subscribe);
}
return 0;
}
#endif
/** @internal Add authorization data */
static int nh_authorize(nua_handle_t *nh, tag_type_t tag, tag_value_t value, ...)
{
int retval = 0;
tagi_t const *ti;
ta_list ta;
ta_start(ta, tag, value);
for (ti = ta_args(ta); ti; ti = tl_next(ti)) {
if (ti->t_tag == nutag_auth && ti->t_value) {
char *data = (char *)ti->t_value;
int rv = auc_credentials(&nh->nh_auth, nh->nh_home, data);
if (rv > 0) {
retval = 1;
}
else if (rv < 0) {
retval = -1;
break;
}
}
}
ta_end(ta);
return retval;
}
/** @NUA_EVENT nua_r_authenticate
*
* Response to nua_authenticate(). Under normal operation, this event is
* never sent but rather the unauthenticated operation is completed.
* However, if there is no operation to authentication or if there is an
* authentication error the #nua_r_authenticate event is sent to the
* application with the status code as follows:
* - <i>202 No operation to restart</i>:\n
* The authenticator associated with the handle was updated, but there was
* no operation to retry with the new credentials.
* - <i>900 Cannot add credentials</i>:\n
* There was internal problem updating authenticator.
* - <i>904 No matching challenge</i>:\n
* There was no challenge matching with the credentials provided by
* nua_authenticate(), e.g., their realm did not match with the one
* received with the challenge.
*
* @param status status code from authentication
* @param phrase a short textual description of @a status code
* @param nh operation handle authenticated
* @param hmagic application context associated with the handle
* @param sip NULL
* @param tags empty
*
* @sa nua_terminate(), nua_handle_destroy()
*
* @END_NUA_EVENT
*/
void
nua_stack_authenticate(nua_t *nua, nua_handle_t *nh, nua_event_t e,
tagi_t const *tags)
{
nua_client_request_t *cr = nh->nh_ds->ds_cr;
int status = nh_authorize(nh, TAG_NEXT(tags));
if (status > 0) {
if (cr && cr->cr_wait_for_cred) {
cr->cr_waiting = cr->cr_wait_for_cred = 0;
nua_client_restart_request(cr, cr->cr_terminating, tags);
}
else {
nua_stack_event(nua, nh, NULL, e,
202, "No operation to restart",
NULL);
}
}
else if (cr && cr->cr_wait_for_cred) {
cr->cr_waiting = cr->cr_wait_for_cred = 0;
if (status < 0)
nua_client_response(cr, 900, "Operation cannot add credentials", NULL);
else
nua_client_response(cr, 904, "Operation has no matching challenge ", NULL);
}
else if (status < 0) {
nua_stack_event(nua, nh, NULL, e, 900, "Cannot add credentials", NULL);
}
else {
nua_stack_event(nua, nh, NULL, e, 904, "No matching challenge", NULL);
}
}
/** Request restarted by timer */
static void
nua_client_restart_after(su_root_magic_t *magic,
su_timer_t *timer,
nua_client_request_t *cr)
{
cr->cr_waiting = 0;
su_timer_destroy(cr->cr_timer), cr->cr_timer = NULL;
nua_client_restart_request(cr, cr->cr_terminating, NULL);
nua_client_request_unref(cr);
}
/** Restart request.
*
* @retval 1 if restarted
* @retval 0 otherwise
*/
int nua_client_restart(nua_client_request_t *cr,
int status, char const *phrase)
{
nua_handle_t *nh = cr->cr_owner;
nta_outgoing_t *orq;
int error = -1, terminated, graceful;
if (cr->cr_retry_count > NH_PGET(nh, retry_count))
return 0;
orq = cr->cr_orq, cr->cr_orq = NULL; assert(orq);
terminated = cr->cr_terminated, cr->cr_terminated = 0;
graceful = cr->cr_graceful, cr->cr_graceful = 0;
cr->cr_restarting = 1;
error = nua_client_request_sendmsg(cr);
cr->cr_restarting = 0;
if (error) {
cr->cr_graceful = graceful;
cr->cr_terminated = terminated;
assert(cr->cr_orq == NULL);
cr->cr_orq = orq;
return 0;
}
nua_client_report(cr, status, phrase, NULL, orq, NULL);
nta_outgoing_destroy(orq);
nua_client_request_unref(cr); /* ... reference used by old orq */
return 1;
}
int nua_client_set_target(nua_client_request_t *cr, url_t const *target)
{
url_t *new_target, *old_target = cr->cr_target;
if (!target || target == old_target)
return 0;
new_target = url_hdup(cr->cr_owner->nh_home, (url_t *)target);
if (!new_target)
return -1;
cr->cr_target = new_target;
if (old_target)
su_free(cr->cr_owner->nh_home, old_target);
return 0;
}
/**@internal
* Relay response event to the application.
*
* @todo
* If handle has already been marked as destroyed by nua_handle_destroy(),
* release the handle with nh_destroy().
*
* @retval 0 if event was preliminary
* @retval 1 if event was final
* @retval 2 if event destroyed the handle, too.
*/
int nua_base_client_tresponse(nua_client_request_t *cr,
int status, char const *phrase,
sip_t const *sip,
tag_type_t tag, tag_value_t value, ...)
{
ta_list ta;
int retval;
if (cr->cr_event == nua_r_destroy)
return nua_base_client_response(cr, status, phrase, sip, NULL);
ta_start(ta, tag, value);
retval = nua_base_client_response(cr, status, phrase, sip, ta_args(ta));
ta_end(ta);
return retval;
}
/**@internal
* Relay response event to the application.
*
* @todo
* If handle has already been marked as destroyed by nua_handle_destroy(),
* release the handle with nh_destroy().
*
* @retval 0 if event was preliminary
* @retval 1 if event was final
* @retval 2 if event destroyed the handle, too.
*/
int nua_base_client_response(nua_client_request_t *cr,
int status, char const *phrase,
sip_t const *sip,
tagi_t const *tags)
{
nua_handle_t *nh = cr->cr_owner;
sip_method_t method = cr->cr_method;
nua_dialog_usage_t *du;
cr->cr_reporting = 1, nh->nh_ds->ds_reporting = 1;
if (nh->nh_auth && sip &&
(sip->sip_authentication_info || sip->sip_proxy_authentication_info)) {
/* Collect nextnonce */
if (sip->sip_authentication_info)
auc_info(&nh->nh_auth,
sip->sip_authentication_info,
sip_authorization_class);
if (sip->sip_proxy_authentication_info)
auc_info(&nh->nh_auth,
sip->sip_proxy_authentication_info,
sip_proxy_authorization_class);
}
if ((method != sip_method_invite && status >= 200) || status >= 300)
nua_client_request_remove(cr);
nua_client_report(cr, status, phrase, sip, cr->cr_orq, tags);
if (status < 200 ||
/* Un-ACKed 2XX response to INVITE */
(method == sip_method_invite && status < 300 && !cr->cr_acked)) {
cr->cr_reporting = 0, nh->nh_ds->ds_reporting = 0;
return 1;
}
nua_client_request_clean(cr);
du = cr->cr_usage;
if (cr->cr_terminated < 0) {
/* XXX - dialog has been terminated */;
nua_dialog_deinit(nh, nh->nh_ds), cr->cr_usage = NULL;
}
else if (du) {
if (cr->cr_terminated ||
(!du->du_ready && status >= 300 && nua_client_is_bound(cr))) {
/* Usage has been destroyed */
nua_dialog_usage_remove(nh, nh->nh_ds, du, cr, NULL), cr->cr_usage = NULL;
}
else if (cr->cr_graceful) {
/* Terminate usage gracefully */
if (nua_dialog_usage_shutdown(nh, nh->nh_ds, du) > 0)
cr->cr_usage = NULL;
}
}
else if (cr->cr_terminated) {
if (nh->nh_ds->ds_usage == NULL)
nua_dialog_remove(nh, nh->nh_ds, NULL), cr->cr_usage = NULL;
}
cr->cr_phrase = NULL;
cr->cr_reporting = 0, nh->nh_ds->ds_reporting = 0;
if (method == sip_method_cancel)
return 1;
return nua_client_next_request(nh->nh_ds->ds_cr, method == sip_method_invite);
}
/** Send event, zap transaction but leave cr in list */
int nua_client_report(nua_client_request_t *cr,
int status, char const *phrase,
sip_t const *sip,
nta_outgoing_t *orq,
tagi_t const *tags)
{
nua_handle_t *nh;
if (cr->cr_event == nua_r_destroy)
return 1;
if (cr->cr_methods->crm_report)
return cr->cr_methods->crm_report(cr, status, phrase, sip, orq, tags);
nh = cr->cr_owner;
nua_stack_event(nh->nh_nua, nh,
nta_outgoing_getresponse(orq),
(enum nua_event_e)cr->cr_event,
status, phrase,
tags);
return 1;
}
int nua_client_treport(nua_client_request_t *cr,
int status, char const *phrase,
sip_t const *sip,
nta_outgoing_t *orq,
tag_type_t tag, tag_value_t value, ...)
{
int retval;
ta_list ta;
ta_start(ta, tag, value);
retval = nua_client_report(cr, status, phrase, sip, orq, ta_args(ta));
ta_end(ta);
return retval;
}
int nua_client_next_request(nua_client_request_t *cr, int invite)
{
for (; cr; cr = cr->cr_next) {
if (cr->cr_method == sip_method_cancel)
continue;
break;
}
if (cr && !nua_client_request_in_progress(cr)) {
nua_client_init_request(cr);
}
return 1;
}
nua_client_request_t *
nua_client_request_pending(nua_client_request_t const *cr)
{
for (;cr;cr = cr->cr_next)
if (cr->cr_orq)
return (nua_client_request_t *)cr;
return NULL;
}
/**@internal
* Save handle parameters and initial authentication info.
*
* @retval -1 upon an error
* @retval 0 when successful
*/
int nua_stack_init_handle(nua_t *nua, nua_handle_t *nh, tagi_t const *tags)
{
int retval = 0;
if (nh == NULL)
return -1;
assert(nh != nua->nua_dhandle);
if (nua_stack_set_params(nua, nh, nua_i_error, tags) < 0)
retval = -1;
if (retval || nh->nh_init) /* Already initialized? */
return retval;
if (nh->nh_tags)
nh_authorize(nh, TAG_NEXT(nh->nh_tags));
nh->nh_init = 1;
return 0;
}
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