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/*
* asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2014, Digium, Inc.
*
* Joshua Colp <jcolp@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*** MODULEINFO
<depend>pjproject</depend>
<depend>res_pjsip</depend>
<depend>res_pjsip_pubsub</depend>
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <pjsip.h>
#include <pjsip_simple.h>
#include <pjlib.h>
#include "asterisk/module.h"
#include "asterisk/res_pjsip.h"
#include "asterisk/res_pjsip_pubsub.h"
#include "asterisk/res_pjsip_presence_xml.h"
#include "asterisk/res_pjsip_body_generator_types.h"
/*! \brief Structure which contains dialog-info+xml state information */
struct dialog_info_xml_state {
/*! \brief Version to place into the next NOTIFY */
unsigned int version;
};
/*! \brief Destructor for dialog-info+xml information */
static void dialog_info_xml_state_destroy(void *obj)
{
ast_free(obj);
}
/*! \brief Datastore for attaching dialog-info+xml state information */
static const struct ast_datastore_info dialog_info_xml_datastore = {
.type = "dialog-info+xml",
.destroy = dialog_info_xml_state_destroy,
};
static void *dialog_info_allocate_body(void *data)
{
struct ast_sip_exten_state_data *state_data = data;
return ast_sip_presence_xml_create_node(state_data->pool, NULL, "dialog-info");
}
static struct ast_datastore *dialog_info_xml_state_find_or_create(struct ao2_container *datastores)
{
struct ast_datastore *datastore = ast_datastores_find(datastores, "dialog-info+xml");
if (datastore) {
return datastore;
}
datastore = ast_datastores_alloc_datastore(&dialog_info_xml_datastore, "dialog-info+xml");
if (!datastore) {
return NULL;
}
datastore->data = ast_calloc(1, sizeof(struct dialog_info_xml_state));
if (!datastore->data || ast_datastores_add(datastores, datastore)) {
ao2_ref(datastore, -1);
return NULL;
}
return datastore;
}
static unsigned int dialog_info_xml_get_version(struct ao2_container *datastores, unsigned int *version)
{
struct ast_datastore *datastore = dialog_info_xml_state_find_or_create(datastores);
struct dialog_info_xml_state *state;
if (!datastore) {
return -1;
}
state = datastore->data;
*version = state->version++;
ao2_ref(datastore, -1);
return 0;
}
static int dialog_info_generate_body_content(void *body, void *data)
{
pj_xml_node *dialog_info = body, *dialog, *state;
struct ast_sip_exten_state_data *state_data = data;
char *local = ast_strdupa(state_data->local), *stripped, *statestring = NULL;
char *pidfstate = NULL, *pidfnote = NULL;
enum ast_sip_pidf_state local_state;
unsigned int version;
char version_str[32], sanitized[PJSIP_MAX_URL_SIZE];
struct ast_sip_endpoint *endpoint = NULL;
unsigned int notify_early_inuse_ringing = 0;
if (!local || !state_data->datastores) {
return -1;
}
if (dialog_info_xml_get_version(state_data->datastores, &version)) {
ast_log(LOG_WARNING, "dialog-info+xml version could not be retrieved from datastore\n");
return -1;
}
stripped = ast_strip_quoted(local, "<", ">");
ast_sip_sanitize_xml(stripped, sanitized, sizeof(sanitized));
if (state_data->sub && (endpoint = ast_sip_subscription_get_endpoint(state_data->sub))) {
notify_early_inuse_ringing = endpoint->notify_early_inuse_ringing;
ao2_cleanup(endpoint);
}
ast_sip_presence_exten_state_to_str(state_data->exten_state, &statestring,
&pidfstate, &pidfnote, &local_state, notify_early_inuse_ringing);
ast_sip_presence_xml_create_attr(state_data->pool, dialog_info, "xmlns", "urn:ietf:params:xml:ns:dialog-info");
snprintf(version_str, sizeof(version_str), "%u", version);
ast_sip_presence_xml_create_attr(state_data->pool, dialog_info, "version", version_str);
ast_sip_presence_xml_create_attr(state_data->pool, dialog_info, "state", "full");
ast_sip_presence_xml_create_attr(state_data->pool, dialog_info, "entity", sanitized);
dialog = ast_sip_presence_xml_create_node(state_data->pool, dialog_info, "dialog");
ast_sip_presence_xml_create_attr(state_data->pool, dialog, "id", state_data->exten);
if (!ast_strlen_zero(statestring) && !strcmp(statestring, "early")) {
ast_sip_presence_xml_create_attr(state_data->pool, dialog, "direction", "recipient");
}
state = ast_sip_presence_xml_create_node(state_data->pool, dialog, "state");
pj_strdup2(state_data->pool, &state->content, statestring);
if (state_data->exten_state == AST_EXTENSION_ONHOLD) {
pj_xml_node *local_node, *target, *param;
local_node = ast_sip_presence_xml_create_node(state_data->pool, dialog, "local");
target = ast_sip_presence_xml_create_node(state_data->pool, local_node, "target");
ast_sip_presence_xml_create_attr(state_data->pool, target, "uri", sanitized);
param = ast_sip_presence_xml_create_node(state_data->pool, target, "param");
ast_sip_presence_xml_create_attr(state_data->pool, param, "pname", "+sip.rendering");
ast_sip_presence_xml_create_attr(state_data->pool, param, "pvalue", "no");
}
return 0;
}
/* The maximum number of times the ast_str() for the body text can grow before we declare an XML body
* too large to send.
*/
#define MAX_STRING_GROWTHS 6
static void dialog_info_to_string(void *body, struct ast_str **str)
{
pj_xml_node *dialog_info = body;
int growths = 0;
int size;
do {
size = pj_xml_print(dialog_info, ast_str_buffer(*str), ast_str_size(*str) - 1, PJ_TRUE);
if (size <= AST_PJSIP_XML_PROLOG_LEN) {
ast_str_make_space(str, ast_str_size(*str) * 2);
++growths;
}
} while (size <= AST_PJSIP_XML_PROLOG_LEN && growths < MAX_STRING_GROWTHS);
if (size <= AST_PJSIP_XML_PROLOG_LEN) {
ast_log(LOG_WARNING, "dialog-info+xml body text too large\n");
return;
}
*(ast_str_buffer(*str) + size) = '\0';
ast_str_update(*str);
}
static struct ast_sip_pubsub_body_generator dialog_info_body_generator = {
.type = "application",
.subtype = "dialog-info+xml",
.body_type = AST_SIP_EXTEN_STATE_DATA,
.allocate_body = dialog_info_allocate_body,
.generate_body_content = dialog_info_generate_body_content,
.to_string = dialog_info_to_string,
/* No need for a destroy_body callback since we use a pool */
};
static int load_module(void)
{
if (ast_sip_pubsub_register_body_generator(&dialog_info_body_generator)) {
return AST_MODULE_LOAD_DECLINE;
}
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
ast_sip_pubsub_unregister_body_generator(&dialog_info_body_generator);
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Extension State Dialog Info+XML Provider",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_CHANNEL_DEPEND,
.requires = "res_pjsip,res_pjsip_pubsub",
);
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