/// Mangelwurzel receives an initial request. It will Record-Route itself,
/// strip off all the Via headers and send the request on. It can also change
/// the request in various ways depending on the configuration in its Route
/// header.
/// - It can mangle the dialog identifiers using its mangalgorithm.
/// - It can mangle the Request URI and Contact URI using its mangalgorithm.
/// - It can mangle the To URI using its mangalgorithm.
/// - It can edit the S-CSCF Route header to turn the request into either an
/// originating or terminating request.
/// - It can edit the S-CSCF Route header to turn the request into an out of
/// the blue request.
/// - It can mangle the Record-Route headers URIs.
void MangelwurzelTsx::on_rx_initial_request(pjsip_msg* req)
{
// Store off the unmodified request.
_unmodified_request = original_request();
// If Mangelwurzel receives a REGISTER, we need to respond with a 200 OK
// rather than mangling the request and forwarding it on.
if (req->line.req.method.id == PJSIP_REGISTER_METHOD)
{
pjsip_msg* rsp = create_response(req, PJSIP_SC_OK);
send_response(rsp);
free_msg(req);
return;
}
pj_pool_t* pool = get_pool(req);
// Get Mangelwurzel's route header and clone the URI. We use this in the SAS
// event logging that we've received a request, and then we use it to
// Record-Route ourselves.
const pjsip_route_hdr* mangelwurzel_route_hdr = route_hdr();
pjsip_uri* mangelwurzel_uri =
(pjsip_uri*)pjsip_uri_clone(pool, mangelwurzel_route_hdr->name_addr.uri);
SAS::Event event(trail(), SASEvent::MANGELWURZEL_INITIAL_REQ, 0);
event.add_var_param(PJUtils::uri_to_string(PJSIP_URI_IN_ROUTING_HDR,
mangelwurzel_uri));
SAS::report_event(event);
if (_config.dialog)
{
mangle_dialog_identifiers(req, pool);
}
if (_config.req_uri)
{
mangle_req_uri(req, pool);
mangle_contact(req, pool);
}
if (_config.to)
{
mangle_to(req, pool);
}
edit_scscf_route_hdr(req, pool);
if (_config.routes)
{
mangle_record_routes(req, pool);
}
strip_via_hdrs(req);
record_route(req, pool, mangelwurzel_uri);
send_request(req);
}
static int w_record_route(struct sip_msg *msg, char *key, char *bar)
{
str s;
if (ctx_rrdone_get()==1) {
LM_ERR("Double attempt to record-route\n");
return -1;
}
if (key && pv_printf_s(msg, (pv_elem_t*)key, &s)<0) {
LM_ERR("failed to print the format\n");
return -1;
}
if ( record_route( msg, key?&s:0 )<0 )
return -1;
ctx_rrdone_set(1);
return 1;
}
static int w_record_route(struct sip_msg *msg, char *key, char *bar)
{
str s;
if (msg->id == last_rr_msg) {
LM_ERR("Double attempt to record-route\n");
return -1;
}
if (key && pv_printf_s(msg, (pv_elem_t*)key, &s)<0) {
LM_ERR("failed to print the format\n");
return -1;
}
if ( record_route( msg, key?&s:0 )<0 )
return -1;
last_rr_msg = msg->id;
return 1;
}
/**
* wrapper for record_route(msg, params)
*/
static int w_record_route(struct sip_msg *msg, char *key, char *bar)
{
str s;
if (msg->msg_flags & FL_RR_ADDED) {
LM_ERR("Double attempt to record-route\n");
return -1;
}
if (key && pv_printf_s(msg, (pv_elem_t*)key, &s)<0) {
LM_ERR("failed to print the format\n");
return -1;
}
if ( record_route( msg, key?&s:0 )<0 )
return -1;
msg->msg_flags |= FL_RR_ADDED;
return 1;
}