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core/ari/pjsip: Add refer mechanism

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This change adds support for refers that are not session based. It
includes a refer implementation for the PJSIP technology which results
in out-of-dialog REFERs being sent to a PJSIP endpoint. These can be
triggered using the new ARI endpoint `/endpoints/refer`.

Resolves: #71

UserNote: There is a new ARI endpoint `/endpoints/refer` for referring
an endpoint to some URI or endpoint.
This commit is contained in:
Maximilian Fridrich
2023-05-10 15:53:33 +02:00
committed by asterisk-org-access-app[bot]
parent d16046e41f
commit 51a7b18038
13 changed files with 2815 additions and 736 deletions
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93
res/res_pjsip_nat.c
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@@ -235,52 +235,6 @@ static pj_bool_t nat_on_rx_message(pjsip_rx_data *rdata)
return res;
}
/*! \brief Structure which contains information about a transport */
struct request_transport_details {
/*! \brief Type of transport */
enum ast_transport type;
/*! \brief Potential pointer to the transport itself, if UDP */
pjsip_transport *transport;
/*! \brief Potential pointer to the transport factory itself, if TCP/TLS */
pjsip_tpfactory *factory;
/*! \brief Local address for transport */
pj_str_t local_address;
/*! \brief Local port for transport */
int local_port;
};
/*! \brief Callback function for finding the transport the request is going out on */
static int find_transport_state_in_use(void *obj, void *arg, int flags)
{
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 (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;
}
/*! \brief Helper function which returns the SIP URI of a Contact header */
static pjsip_sip_uri *nat_get_contact_sip_uri(pjsip_tx_data *tdata)
{
pjsip_contact_hdr *contact = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CONTACT, NULL);
if (!contact || (!PJSIP_URI_SCHEME_IS_SIP(contact->uri) && !PJSIP_URI_SCHEME_IS_SIPS(contact->uri))) {
return NULL;
}
return pjsip_uri_get_uri(contact->uri);
}
/*! \brief Structure which contains hook details */
struct nat_hook_details {
/*! \brief Outgoing message itself */
@@ -363,55 +317,22 @@ static void restore_orig_contact_host(pjsip_tx_data *tdata)
static pj_status_t process_nat(pjsip_tx_data *tdata)
{
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_sip_request_transport_details details;
struct ast_sockaddr addr = { { 0, } };
pjsip_sip_uri *uri = NULL;
RAII_VAR(struct ao2_container *, hooks, NULL, ao2_cleanup);
/* If a transport selector is in use we know the transport or factory, so explicitly find it */
if (tdata->tp_sel.type == PJSIP_TPSELECTOR_TRANSPORT) {
details.transport = tdata->tp_sel.u.transport;
} else if (tdata->tp_sel.type == PJSIP_TPSELECTOR_LISTENER) {
details.factory = tdata->tp_sel.u.listener;
} else if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP || tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP6) {
/* Connectionless uses the same transport for all requests */
details.type = AST_TRANSPORT_UDP;
details.transport = tdata->tp_info.transport;
} else {
if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_TCP) {
details.type = AST_TRANSPORT_TCP;
} else if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_TLS) {
details.type = AST_TRANSPORT_TLS;
} else {
/* Unknown transport type, we can't map and thus can't apply NAT changes */
return PJ_SUCCESS;
}
if ((uri = nat_get_contact_sip_uri(tdata))) {
details.local_address = uri->host;
details.local_port = uri->port;
} else if ((tdata->msg->type == PJSIP_REQUEST_MSG) &&
(via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL))) {
details.local_address = via->sent_by.host;
details.local_port = via->sent_by.port;
} else {
return PJ_SUCCESS;
}
if (!details.local_port) {
details.local_port = (details.type == AST_TRANSPORT_TLS) ? 5061 : 5060;
}
}
if (!(transport_states = ast_sip_get_transport_states())) {
if (ast_sip_set_request_transport_details(&details, tdata, 0)) {
return PJ_SUCCESS;
}
if (!(transport_state = ao2_callback(transport_states, 0, find_transport_state_in_use, &details))) {
uri = ast_sip_get_contact_sip_uri(tdata);
via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL);
if (!(transport_state = ast_sip_find_transport_state_in_use(&details))) {
return PJ_SUCCESS;
}
@@ -443,7 +364,7 @@ static pj_status_t process_nat(pjsip_tx_data *tdata)
if (!cseq || tdata->msg->type == PJSIP_REQUEST_MSG ||
pjsip_method_cmp(&cseq->method, &pjsip_register_method)) {
/* We can only rewrite the URI when one is present */
if (uri || (uri = nat_get_contact_sip_uri(tdata))) {
if (uri || (uri = ast_sip_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;