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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2013, Digium, Inc.
*
* Mark Michelson <mmichelson@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_sip</depend>
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <pjsip.h>
#include "asterisk/res_sip.h"
#include "asterisk/module.h"
#include "asterisk/acl.h"
/*** DOCUMENTATION
<configInfo name="res_sip_endpoint_identifier_ip" language="en_US">
<synopsis>Module that identifies endpoints via source IP address</synopsis>
<configFile name="res_sip.conf">
<configObject name="identify">
<configOption name="endpoint">
<synopsis>Name of Endpoint</synopsis>
</configOption>
<configOption name="match">
<synopsis>IP addresses or networks to match against</synopsis>
</configOption>
<configOption name="type">
<synopsis>Must be of type 'identify'.</synopsis>
</configOption>
</configObject>
</configFile>
</configInfo>
***/
/*! \brief Structure for an IP identification matching object */
struct ip_identify_match {
/*! \brief Sorcery object details */
SORCERY_OBJECT(details);
/*! \brief Stringfields */
AST_DECLARE_STRING_FIELDS(
/*! The name of the endpoint */
AST_STRING_FIELD(endpoint_name);
);
/*! \brief Networks or addresses that should match this */
struct ast_ha *matches;
};
/*! \brief Destructor function for a matching object */
static void ip_identify_destroy(void *obj)
{
struct ip_identify_match *identify = obj;
ast_string_field_free_memory(identify);
ast_free_ha(identify->matches);
}
/*! \brief Allocator function for a matching object */
static void *ip_identify_alloc(const char *name)
{
struct ip_identify_match *identify = ast_sorcery_generic_alloc(sizeof(*identify), ip_identify_destroy);
if (!identify || ast_string_field_init(identify, 256)) {
ao2_cleanup(identify);
return NULL;
}
return identify;
}
/*! \brief Comparator function for a matching object */
static int ip_identify_match_check(void *obj, void *arg, int flags)
{
struct ip_identify_match *identify = obj;
struct ast_sockaddr *addr = arg;
return (ast_apply_ha(identify->matches, addr) != AST_SENSE_ALLOW) ? CMP_MATCH | CMP_STOP : 0;
}
static struct ast_sip_endpoint *ip_identify(pjsip_rx_data *rdata)
{
struct ast_sockaddr addr = { { 0, } };
RAII_VAR(struct ao2_container *, candidates, NULL, ao2_cleanup);
RAII_VAR(struct ip_identify_match *, match, NULL, ao2_cleanup);
/* If no possibilities exist return early to save some time */
if (!(candidates = ast_sorcery_retrieve_by_fields(ast_sip_get_sorcery(), "identify", AST_RETRIEVE_FLAG_MULTIPLE | AST_RETRIEVE_FLAG_ALL, NULL)) ||
!ao2_container_count(candidates)) {
return NULL;
}
ast_sockaddr_parse(&addr, rdata->pkt_info.src_name, PARSE_PORT_FORBID);
ast_sockaddr_set_port(&addr, rdata->pkt_info.src_port);
if (!(match = ao2_callback(candidates, 0, ip_identify_match_check, &addr))) {
return NULL;
}
return ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "endpoint", match->endpoint_name);
}
static struct ast_sip_endpoint_identifier ip_identifier = {
.identify_endpoint = ip_identify,
};
/*! \brief Custom handler for match field */
static int ip_identify_match_handler(const struct aco_option *opt, struct ast_variable *var, void *obj)
{
struct ip_identify_match *identify = obj;
int error = 0;
/* We deny what we actually want to match because there is an implicit permit all rule for ACLs */
if (!(identify->matches = ast_append_ha("d", var->value, identify->matches, &error))) {
return -1;
}
return error;
}
static int load_module(void)
{
ast_sorcery_apply_default(ast_sip_get_sorcery(), "identify", "config", "res_sip.conf,criteria=type=identify");
if (ast_sorcery_object_register(ast_sip_get_sorcery(), "identify", ip_identify_alloc, NULL, NULL)) {
return AST_MODULE_LOAD_DECLINE;
}
ast_sorcery_object_field_register(ast_sip_get_sorcery(), "identify", "type", "", OPT_NOOP_T, 0, 0);
ast_sorcery_object_field_register(ast_sip_get_sorcery(), "identify", "endpoint", "", OPT_STRINGFIELD_T, 0, STRFLDSET(struct ip_identify_match, endpoint_name));
ast_sorcery_object_field_register_custom(ast_sip_get_sorcery(), "identify", "match", "", ip_identify_match_handler, NULL, 0, 0);
ast_sorcery_reload_object(ast_sip_get_sorcery(), "identify");
ast_sip_register_endpoint_identifier(&ip_identifier);
return AST_MODULE_LOAD_SUCCESS;
}
static int reload_module(void)
{
ast_sorcery_reload_object(ast_sip_get_sorcery(), "identify");
return 0;
}
static int unload_module(void)
{
ast_sip_unregister_endpoint_identifier(&ip_identifier);
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "SIP IP endpoint identifier",
.load = load_module,
.reload = reload_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND,
);
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