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res_pjsip_outbound_registration: Add virtual line support.

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Virtual line support establishes a relationship between messages
related to an outbound registration and a local endpoint. This is
accomplished by attaching a parameter to the Contact of the outbound
registration and looking for it on any received requests. If the
parameter exists and can be matched to an outbound registration
the configured endpoint is associated with the request.

ASTERISK-24949 #close
Reported by: Joshua Colp

Change-Id: I7df909d2625479110a83fdd354c21ac539e8615d
changes/87/287/1
Joshua Colp 11 years ago
parent df23c8a86b
commit 89f6719f7a
3 changed files with 102 additions and 4 deletions
Show Stats Download Patch File Download Diff File

6
CHANGES
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@ -23,6 +23,12 @@ chan_pjsip
* The configuration setting 'progressinband' now defaults to 'no', which
matches the actual behavior of previous versions.
* New 'line' and 'endpoint' options added on outbound registrations. This allows some
identifying information to be added to the Contact of the outbound registration.
If this information is present on messages received from the remote server
the message will automatically be associated with the configured endpoint on the
outbound registration.
res_pjsip
------------------
* A new CLI command has been added: "pjsip show settings", which shows

7
configs/samples/pjsip.conf.sample
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@ -167,6 +167,11 @@
; "contact_user=" sets the SIP contact header's user portion of the SIP URI
; this will affect the extension reached in dialplan when the far end calls you at this
; registration. The default is 's'.
;
; If you would like to enable line support and have incoming calls related to this
; registration go to an endpoint automatically the "line" and "endpoint" options must
; be set. The "endpoint" option specifies what endpoint the incoming call should be
; associated with.
;[mytrunk]
;type=registration
@ -178,6 +183,8 @@
;retry_interval=60
;forbidden_retry_interval=600
;expiration=3600
;line=yes
;endpoint=mytrunk
;[mytrunk_auth]
;type=auth

93
res/res_pjsip_outbound_registration.c
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@ -114,6 +114,22 @@
<literal>pjsip.conf</literal>. As with other <literal>res_pjsip</literal> modules, this will use the first available transport of the appropriate type if unconfigured.</para></note>
</description>
</configOption>
<configOption name="line">
<synopsis>Whether to add a 'line' parameter to the Contact for inbound call matching</synopsis>
<description><para>
When enabled this option will cause a 'line' parameter to be added to the Contact
header placed into the outgoing registration request. If the remote server sends a call
this line parameter will be used to establish a relationship to the outbound registration,
ultimately causing the configured endpoint to be used.
</para></description>
</configOption>
<configOption name="endpoint">
<synopsis>Endpoint to use for incoming related calls</synopsis>
<description><para>
When line support is enabled this configured endpoint name is used for incoming calls
that are related to the outbound registration.
</para></description>
</configOption>
<configOption name="type">
<synopsis>Must be of type 'registration'.</synopsis>
</configOption>
@ -354,6 +370,54 @@ static struct ao2_container *get_registrations(void)
return registrations;
}
/*! \brief Callback function for matching an outbound registration based on line */
static int line_identify_relationship(void *obj, void *arg, int flags)
{
struct sip_outbound_registration_state *state = obj;
pjsip_param *line = arg;
return !pj_strcmp2(&line->value, state->client_state->line) ? CMP_MATCH | CMP_STOP : 0;
}
/*! \brief Endpoint identifier which uses the 'line' parameter to establish a relationship to an outgoing registration */
static struct ast_sip_endpoint *line_identify(pjsip_rx_data *rdata)
{
pjsip_sip_uri *uri;
static const pj_str_t LINE_STR = { "line", 4 };
pjsip_param *line;
RAII_VAR(struct ao2_container *, states, NULL, ao2_cleanup);
RAII_VAR(struct sip_outbound_registration_state *, state, NULL, ao2_cleanup);
if (!PJSIP_URI_SCHEME_IS_SIP(rdata->msg_info.to->uri) && !PJSIP_URI_SCHEME_IS_SIPS(rdata->msg_info.to->uri)) {
return NULL;
}
uri = pjsip_uri_get_uri(rdata->msg_info.to->uri);
line = pjsip_param_find(&uri->other_param, &LINE_STR);
if (!line) {
return NULL;
}
states = ao2_global_obj_ref(current_states);
if (!states) {
return NULL;
}
state = ao2_callback(states, 0, line_identify_relationship, line);
if (!state || ast_strlen_zero(state->registration->endpoint)) {
return NULL;
}
ast_debug(3, "Determined relationship to outbound registration '%s' based on line '%s', using configured endpoint '%s'\n",
ast_sorcery_object_get_id(state->registration), state->client_state->line, state->registration->endpoint);
return ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "endpoint", state->registration->endpoint);
}
static struct ast_sip_endpoint_identifier line_identifier = {
.identify_endpoint = line_identify,
};
/*! \brief Helper function which cancels the timer on a client */
static void cancel_registration(struct sip_outbound_registration_client_state *client_state)
{
@ -784,7 +848,8 @@ static void *sip_outbound_registration_alloc(const char *name)
}
/*! \brief Helper function which populates a pj_str_t with a contact header */
static int sip_dialog_create_contact(pj_pool_t *pool, pj_str_t *contact, const char *user, const pj_str_t *target, pjsip_tpselector *selector)
static int sip_dialog_create_contact(pj_pool_t *pool, pj_str_t *contact, const char *user, const pj_str_t *target, pjsip_tpselector *selector,
const char *line)
{
pj_str_t tmp, local_addr;
pjsip_uri *uri;
@ -828,7 +893,7 @@ static int sip_dialog_create_contact(pj_pool_t *pool, pj_str_t *contact, const c
contact->ptr = pj_pool_alloc(pool, PJSIP_MAX_URL_SIZE);
contact->slen = pj_ansi_snprintf(contact->ptr, PJSIP_MAX_URL_SIZE,
"<%s:%s@%s%.*s%s:%d%s%s>",
"<%s:%s@%s%.*s%s:%d%s%s%s%s>",
(pjsip_transport_get_flag_from_type(type) & PJSIP_TRANSPORT_SECURE) ? "sips" : "sip",
user,
(type & PJSIP_TRANSPORT_IPV6) ? "[" : "",
@ -837,7 +902,9 @@ static int sip_dialog_create_contact(pj_pool_t *pool, pj_str_t *contact, const c
(type & PJSIP_TRANSPORT_IPV6) ? "]" : "",
local_port,
(type != PJSIP_TRANSPORT_UDP && type != PJSIP_TRANSPORT_UDP6) ? ";transport=" : "",
(type != PJSIP_TRANSPORT_UDP && type != PJSIP_TRANSPORT_UDP6) ? pjsip_transport_get_type_name(type) : "");
(type != PJSIP_TRANSPORT_UDP && type != PJSIP_TRANSPORT_UDP6) ? pjsip_transport_get_type_name(type) : "",
!ast_strlen_zero(line) ? ";line=" : "",
S_OR(line, ""));
return 0;
}
@ -959,9 +1026,15 @@ static int sip_outbound_registration_regc_alloc(void *data)
pjsip_regc_set_route_set(state->client_state->client, &route_set);
}
if (state->registration->line) {
ast_generate_random_string(state->client_state->line, sizeof(state->client_state->line));
}
pj_cstr(&server_uri, registration->server_uri);
if (sip_dialog_create_contact(pjsip_regc_get_pool(state->client_state->client), &contact_uri, S_OR(registration->contact_user, "s"), &server_uri, &selector)) {
if (sip_dialog_create_contact(pjsip_regc_get_pool(state->client_state->client), &contact_uri, S_OR(registration->contact_user, "s"), &server_uri, &selector,
state->client_state->line)) {
return -1;
}
@ -1026,6 +1099,14 @@ static int sip_outbound_registration_apply(const struct ast_sorcery *sorcery, vo
ast_log(LOG_ERROR, "No client URI specified on outbound registration '%s'\n",
ast_sorcery_object_get_id(applied));
return -1;
} else if (applied->line && ast_strlen_zero(applied->endpoint)) {
ast_log(LOG_ERROR, "Line support has been enabled on outbound registration '%s' without providing an endpoint\n",
ast_sorcery_object_get_id(applied));
return -1;
} else if (!ast_strlen_zero(applied->endpoint) && !applied->line) {
ast_log(LOG_ERROR, "An endpoint has been specified on outbound registration '%s' without enabling line support\n",
ast_sorcery_object_get_id(applied));
return -1;
}
if (state && can_reuse_registration(state->registration, applied)) {
@ -1619,6 +1700,7 @@ static const struct ast_sorcery_instance_observer observer_callbacks_registratio
static int unload_module(void)
{
ast_sip_unregister_endpoint_identifier(&line_identifier);
ast_sorcery_observer_remove(ast_sip_get_sorcery(), "auth", &observer_callbacks_auth);
ast_sorcery_instance_observer_remove(ast_sip_get_sorcery(), &observer_callbacks_registrations);
ast_cli_unregister_multiple(cli_outbound_registration, ARRAY_LEN(cli_outbound_registration));
@ -1658,6 +1740,9 @@ static int load_module(void)
ast_sorcery_object_field_register(ast_sip_get_sorcery(), "registration", "auth_rejection_permanent", "yes", OPT_BOOL_T, 1, FLDSET(struct sip_outbound_registration, auth_rejection_permanent));
ast_sorcery_object_field_register_custom(ast_sip_get_sorcery(), "registration", "outbound_auth", "", outbound_auth_handler, outbound_auths_to_str, outbound_auths_to_var_list, 0, 0);
ast_sorcery_object_field_register(ast_sip_get_sorcery(), "registration", "support_path", "no", OPT_BOOL_T, 1, FLDSET(struct sip_outbound_registration, support_path));
ast_sorcery_object_field_register(ast_sip_get_sorcery(), "registration", "line", "no", OPT_BOOL_T, 1, FLDSET(struct sip_outbound_registration, line));
ast_sorcery_object_field_register(ast_sip_get_sorcery(), "registration", "endpoint", "", OPT_STRINGFIELD_T, 0, STRFLDSET(struct sip_outbound_registration, endpoint));
ast_sip_register_endpoint_identifier(&line_identifier);
ast_manager_register_xml("PJSIPUnregister", EVENT_FLAG_SYSTEM | EVENT_FLAG_REPORTING, ami_unregister);
ast_manager_register_xml("PJSIPRegister", EVENT_FLAG_SYSTEM | EVENT_FLAG_REPORTING, ami_register);

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