#include "asterisk/module.h"
#include "asterisk/acl.h"
-static pj_bool_t nat_on_rx_message(pjsip_rx_data *rdata)
+static void rewrite_uri(pjsip_rx_data *rdata, pjsip_sip_uri *uri)
+{
+ pj_cstr(&uri->host, rdata->pkt_info.src_name);
+ uri->port = rdata->pkt_info.src_port;
+ if (!strcasecmp("WSS", rdata->tp_info.transport->type_name)) {
+ /* WSS is special, we don't want to overwrite the URI at all as it needs to be ws */
+ } else if (strcasecmp("udp", rdata->tp_info.transport->type_name)) {
+ uri->transport_param = pj_str(rdata->tp_info.transport->type_name);
+ } else {
+ uri->transport_param.slen = 0;
+ }
+}
+
+static int rewrite_route_set(pjsip_rx_data *rdata, pjsip_dialog *dlg)
+{
+ pjsip_rr_hdr *rr = NULL;
+ pjsip_sip_uri *uri;
+
+ if (rdata->msg_info.msg->type == PJSIP_RESPONSE_MSG) {
+ pjsip_hdr *iter;
+ for (iter = rdata->msg_info.msg->hdr.prev; iter != &rdata->msg_info.msg->hdr; iter = iter->prev) {
+ if (iter->type == PJSIP_H_RECORD_ROUTE) {
+ rr = (pjsip_rr_hdr *)iter;
+ break;
+ }
+ }
+ } else if (pjsip_method_cmp(&rdata->msg_info.msg->line.req.method, &pjsip_register_method)) {
+ rr = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_RECORD_ROUTE, NULL);
+ }
+
+ if (rr) {
+ uri = pjsip_uri_get_uri(&rr->name_addr);
+ rewrite_uri(rdata, uri);
+ if (dlg && !pj_list_empty(&dlg->route_set) && !dlg->route_set_frozen) {
+ pjsip_routing_hdr *route = dlg->route_set.next;
+ uri = pjsip_uri_get_uri(&route->name_addr);
+ rewrite_uri(rdata, uri);
+ }
+
+ return 0;
+ }
+
+ return -1;
+}
+
+static int rewrite_contact(pjsip_rx_data *rdata, pjsip_dialog *dlg)
{
- RAII_VAR(struct ast_sip_endpoint *, endpoint, ast_pjsip_rdata_get_endpoint(rdata), ao2_cleanup);
pjsip_contact_hdr *contact;
+ contact = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_CONTACT, NULL);
+ if (contact && !contact->star && (PJSIP_URI_SCHEME_IS_SIP(contact->uri) || PJSIP_URI_SCHEME_IS_SIPS(contact->uri))) {
+ pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri);
+
+ rewrite_uri(rdata, uri);
+
+ if (dlg && pj_list_empty(&dlg->route_set) && (!dlg->remote.contact
+ || pjsip_uri_cmp(PJSIP_URI_IN_REQ_URI, dlg->remote.contact->uri, contact->uri))) {
+ dlg->remote.contact = (pjsip_contact_hdr*)pjsip_hdr_clone(dlg->pool, contact);
+ dlg->target = dlg->remote.contact->uri;
+ }
+ return 0;
+ }
+
+ return -1;
+}
+
+static pj_bool_t handle_rx_message(struct ast_sip_endpoint *endpoint, pjsip_rx_data *rdata)
+{
+ pjsip_dialog *dlg = pjsip_rdata_get_dlg(rdata);
+
if (!endpoint) {
return PJ_FALSE;
}
- if (endpoint->nat.rewrite_contact && (contact = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_CONTACT, NULL)) &&
- !contact->star && (PJSIP_URI_SCHEME_IS_SIP(contact->uri) || PJSIP_URI_SCHEME_IS_SIPS(contact->uri))) {
- pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri);
-
- pj_cstr(&uri->host, rdata->pkt_info.src_name);
- uri->port = rdata->pkt_info.src_port;
+ if (endpoint->nat.rewrite_contact) {
+ /* rewrite_contact is intended to ensure we send requests/responses to
+ * a routeable address when NAT is involved. The URI that dictates where
+ * we send requests/responses can be determined either by Record-Route
+ * headers or by the Contact header if no Record-Route headers are present.
+ * We therefore will attempt to rewrite a Record-Route header first, and if
+ * none are present, we fall back to rewriting the Contact header instead.
+ */
+ if (rewrite_route_set(rdata, dlg)) {
+ rewrite_contact(rdata, dlg);
+ }
}
if (endpoint->nat.force_rport) {
- rdata->msg_info.via->rport_param = 0;
+ rdata->msg_info.via->rport_param = rdata->pkt_info.src_port;
}
return PJ_FALSE;
}
+static pj_bool_t nat_on_rx_message(pjsip_rx_data *rdata)
+{
+ pj_bool_t res;
+ struct ast_sip_endpoint *endpoint;
+
+ endpoint = ast_pjsip_rdata_get_endpoint(rdata);
+ res = handle_rx_message(endpoint, rdata);
+ ao2_cleanup(endpoint);
+ return res;
+}
+
/*! \brief Structure which contains information about a transport */
struct request_transport_details {
/*! \brief Type of transport */
};
/*! \brief Callback function for finding the transport the request is going out on */
-static int find_transport_in_use(void *obj, void *arg, int flags)
+static int find_transport_state_in_use(void *obj, void *arg, int flags)
{
- struct ast_sip_transport *transport = obj;
+ struct ast_sip_transport_state *transport_state = obj;
struct request_transport_details *details = arg;
/* If an explicit transport or factory matches then this is what is in use, if we are unavailable
* to compare based on that we make sure that the type is the same and the source IP address/port are the same
*/
- if ((details->transport && details->transport == transport->state->transport) ||
- (details->factory && details->factory == transport->state->factory) ||
- ((details->type == transport->type) && (transport->state->factory) &&
- !pj_strcmp(&transport->state->factory->addr_name.host, &details->local_address) &&
- transport->state->factory->addr_name.port == details->local_port)) {
- return CMP_MATCH | CMP_STOP;
+ if (transport_state && ((details->transport && details->transport == transport_state->transport) ||
+ (details->factory && details->factory == transport_state->factory) ||
+ ((details->type == transport_state->type) && (transport_state->factory) &&
+ !pj_strcmp(&transport_state->factory->addr_name.host, &details->local_address) &&
+ transport_state->factory->addr_name.port == details->local_port))) {
+ return CMP_MATCH;
}
return 0;
static pj_status_t nat_on_tx_message(pjsip_tx_data *tdata)
{
- RAII_VAR(struct ao2_container *, transports, NULL, ao2_cleanup);
+ RAII_VAR(struct ao2_container *, transport_states, NULL, ao2_cleanup);
RAII_VAR(struct ast_sip_transport *, transport, NULL, ao2_cleanup);
+ RAII_VAR(struct ast_sip_transport_state *, transport_state, NULL, ao2_cleanup);
struct request_transport_details details = { 0, };
pjsip_via_hdr *via = NULL;
struct ast_sockaddr addr = { { 0, } };
}
}
- if (!(transports = ast_sorcery_retrieve_by_fields(ast_sip_get_sorcery(), "transport", AST_RETRIEVE_FLAG_MULTIPLE | AST_RETRIEVE_FLAG_ALL, NULL)) ||
- !(transport = ao2_callback(transports, 0, find_transport_in_use, &details)) || !transport->localnet ||
- ast_sockaddr_isnull(&transport->external_address)) {
+ if (!(transport_states = ast_sip_get_transport_states())) {
return PJ_SUCCESS;
}
- ast_sockaddr_parse(&addr, tdata->tp_info.dst_name, PARSE_PORT_FORBID);
- ast_sockaddr_set_port(&addr, tdata->tp_info.dst_port);
+ if (!(transport_state = ao2_callback(transport_states, 0, find_transport_state_in_use, &details))) {
+ return PJ_SUCCESS;
+ }
- /* See if where we are sending this request is local or not, and if not that we can get a Contact URI to modify */
- if (ast_apply_ha(transport->localnet, &addr) != AST_SENSE_ALLOW) {
+ if (!(transport = ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "transport", transport_state->id))) {
return PJ_SUCCESS;
}
- /* Update the contact header with the external address */
- if (uri || (uri = nat_get_contact_sip_uri(tdata))) {
- pj_strdup2(tdata->pool, &uri->host, ast_sockaddr_stringify_host(&transport->external_address));
- if (transport->external_signaling_port) {
- uri->port = transport->external_signaling_port;
+ if (transport_state->localnet) {
+ ast_sockaddr_parse(&addr, tdata->tp_info.dst_name, PARSE_PORT_FORBID);
+ ast_sockaddr_set_port(&addr, tdata->tp_info.dst_port);
+
+ /* See if where we are sending this request is local or not, and if not that we can get a Contact URI to modify */
+ if (ast_sip_transport_is_local(transport_state, &addr)) {
+ ast_debug(5, "Request is being sent to local address, skipping NAT manipulation\n");
+ return PJ_SUCCESS;
}
}
- /* Update the via header if relevant */
- if ((tdata->msg->type == PJSIP_REQUEST_MSG) && (via || (via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL)))) {
- pj_strdup2(tdata->pool, &via->sent_by.host, ast_sockaddr_stringify_host(&transport->external_address));
- if (transport->external_signaling_port) {
- via->sent_by.port = transport->external_signaling_port;
+ if (!ast_sockaddr_isnull(&transport_state->external_signaling_address)) {
+ /* Update the contact header with the external address */
+ if (uri || (uri = nat_get_contact_sip_uri(tdata))) {
+ pj_strdup2(tdata->pool, &uri->host, ast_sockaddr_stringify_host(&transport_state->external_signaling_address));
+ if (transport->external_signaling_port) {
+ uri->port = transport->external_signaling_port;
+ ast_debug(4, "Re-wrote Contact URI port to %d\n", uri->port);
+ }
+ }
+
+ /* Update the via header if relevant */
+ if ((tdata->msg->type == PJSIP_REQUEST_MSG) && (via || (via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL)))) {
+ pj_strdup2(tdata->pool, &via->sent_by.host, ast_sockaddr_stringify_host(&transport_state->external_signaling_address));
+ if (transport->external_signaling_port) {
+ via->sent_by.port = transport->external_signaling_port;
+ }
}
}
return 0;
}
+/*! \brief Function called when an INVITE response comes in */
+static void nat_incoming_invite_response(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
+{
+ handle_rx_message(session->endpoint, rdata);
+}
+
/*! \brief Function called when an INVITE comes in */
static void nat_outgoing_invite_request(struct ast_sip_session *session, struct pjsip_tx_data *tdata)
{
/*! \brief Supplement for adding NAT functionality to dialog */
static struct ast_sip_session_supplement nat_supplement = {
.method = "INVITE",
- .priority = AST_SIP_SESSION_SUPPLEMENT_PRIORITY_FIRST + 1,
+ .priority = AST_SIP_SUPPLEMENT_PRIORITY_FIRST + 1,
.incoming_request = nat_incoming_invite_request,
.outgoing_request = nat_outgoing_invite_request,
+ .incoming_response = nat_incoming_invite_response,
};
{
if (ast_sip_register_service(&nat_module)) {
ast_log(LOG_ERROR, "Could not register NAT module for incoming and outgoing requests\n");
- return AST_MODULE_LOAD_FAILURE;
+ return AST_MODULE_LOAD_DECLINE;
}
- if (ast_sip_session_register_supplement(&nat_supplement)) {
- ast_log(LOG_ERROR, "Could not register NAT session supplement for incoming and outgoing INVITE requests\n");
- unload_module();
- return AST_MODULE_LOAD_FAILURE;
- }
+ ast_sip_session_register_supplement(&nat_supplement);
return AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP NAT Support",
- .load = load_module,
- .unload = unload_module,
- .load_pri = AST_MODPRI_APP_DEPEND,
- );
+ .support_level = AST_MODULE_SUPPORT_CORE,
+ .load = load_module,
+ .unload = unload_module,
+ .load_pri = AST_MODPRI_APP_DEPEND,
+ .requires = "res_pjsip,res_pjsip_session",
+);
projects / asterisk/asterisk.git / blobdiff