static pj_status_t multihomed_on_tx_message(pjsip_tx_data *tdata) { pjsip_tpmgr_fla2_param prm; pjsip_transport *transport = NULL; pjsip_cseq_hdr *cseq; pjsip_via_hdr *via; /* Use the destination information to determine what local interface this message will go out on */ pjsip_tpmgr_fla2_param_default(&prm); prm.tp_type = tdata->tp_info.transport->key.type; pj_strset2(&prm.dst_host, tdata->tp_info.dst_name); prm.local_if = PJ_TRUE; /* If we can't get the local address use best effort and let it pass */ if (pjsip_tpmgr_find_local_addr2(pjsip_endpt_get_tpmgr(ast_sip_get_pjsip_endpoint()), tdata->pool, &prm) != PJ_SUCCESS) { return PJ_SUCCESS; } /* If the transport it is going out on is different reflect it in the message */ if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP || tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP6) { transport = multihomed_get_udp_transport(&prm.ret_addr, prm.ret_port); } /* If no new transport use the one provided by the message */ if (!transport) { transport = tdata->tp_info.transport; } /* If the message should not be rewritten then abort early */ if (!multihomed_rewrite_header(&prm.ret_addr, transport)) { return PJ_SUCCESS; } /* Update the transport in case it has changed - we do this now in case we don't want to touch the message above */ tdata->tp_info.transport = transport; /* If the message needs to be updated with new address do so */ if (tdata->msg->type == PJSIP_REQUEST_MSG || !(cseq = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CSEQ, NULL)) || pj_strcmp2(&cseq->method.name, "REGISTER")) { 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))) { pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri); /* prm.ret_addr is allocated from the tdata pool so it is perfectly fine to just do an assignment like this */ pj_strassign(&uri->host, &prm.ret_addr); uri->port = prm.ret_port; pjsip_tx_data_invalidate_msg(tdata); } } if (tdata->msg->type == PJSIP_REQUEST_MSG && (via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL))) { pj_strassign(&via->sent_by.host, &prm.ret_addr); via->sent_by.port = prm.ret_port; pjsip_tx_data_invalidate_msg(tdata); } /* Update the SDP if it is present */ if (tdata->msg->body && ast_sip_is_content_type(&tdata->msg->body->content_type, "application", "sdp") && multihomed_rewrite_sdp(tdata->msg->body->data)) { struct pjmedia_sdp_session *sdp = tdata->msg->body->data; int stream; pj_strassign(&sdp->conn->addr, &prm.ret_addr); for (stream = 0; stream < sdp->media_count; ++stream) { if (sdp->media[stream]->conn) { pj_strassign(&sdp->media[stream]->conn->addr, &prm.ret_addr); } } pjsip_tx_data_invalidate_msg(tdata); } return PJ_SUCCESS; }
static pj_status_t multihomed_on_tx_message(pjsip_tx_data *tdata) { pjsip_tpmgr_fla2_param prm; pjsip_cseq_hdr *cseq; pjsip_via_hdr *via; /* Use the destination information to determine what local interface this message will go out on */ pjsip_tpmgr_fla2_param_default(&prm); prm.tp_type = tdata->tp_info.transport->key.type; pj_strset2(&prm.dst_host, tdata->tp_info.dst_name); prm.local_if = PJ_TRUE; /* If we can't get the local address use best effort and let it pass */ if (pjsip_tpmgr_find_local_addr2(pjsip_endpt_get_tpmgr(ast_sip_get_pjsip_endpoint()), tdata->pool, &prm) != PJ_SUCCESS) { return PJ_SUCCESS; } /* The port in the message should always be that of the original transport */ prm.ret_port = tdata->tp_info.transport->local_name.port; /* If the IP source differs from the existing transport see if we need to update it */ if (pj_strcmp(&prm.ret_addr, &tdata->tp_info.transport->local_name.host)) { /* If the transport it is going out on is different reflect it in the message */ if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP || tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP6) { pjsip_transport *transport; transport = multihomed_get_udp_transport(&prm.ret_addr, prm.ret_port); if (transport) { tdata->tp_info.transport = transport; } } /* If the chosen transport is not bound to any we can't use the source address as it won't get back to us */ if (!multihomed_bound_any(tdata->tp_info.transport)) { pj_strassign(&prm.ret_addr, &tdata->tp_info.transport->local_name.host); } } else { /* The transport chosen will deliver this but ensure it is updated with the right information */ pj_strassign(&prm.ret_addr, &tdata->tp_info.transport->local_name.host); } /* If the message needs to be updated with new address do so */ if (tdata->msg->type == PJSIP_REQUEST_MSG || !(cseq = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CSEQ, NULL)) || pj_strcmp2(&cseq->method.name, "REGISTER")) { 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)) && !(tdata->msg->type == PJSIP_RESPONSE_MSG && tdata->msg->line.status.code / 100 == 3)) { pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri); /* prm.ret_addr is allocated from the tdata pool OR the transport so it is perfectly fine to just do an assignment like this */ pj_strassign(&uri->host, &prm.ret_addr); uri->port = prm.ret_port; ast_debug(4, "Re-wrote Contact URI host/port to %.*s:%d\n", (int)pj_strlen(&uri->host), pj_strbuf(&uri->host), uri->port); pjsip_tx_data_invalidate_msg(tdata); } } if (tdata->msg->type == PJSIP_REQUEST_MSG && (via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL))) { pj_strassign(&via->sent_by.host, &prm.ret_addr); via->sent_by.port = prm.ret_port; pjsip_tx_data_invalidate_msg(tdata); } /* Update the SDP if it is present */ if (tdata->msg->body && ast_sip_is_content_type(&tdata->msg->body->content_type, "application", "sdp") && multihomed_rewrite_sdp(tdata->msg->body->data)) { struct pjmedia_sdp_session *sdp = tdata->msg->body->data; int stream; pj_strassign(&sdp->conn->addr, &prm.ret_addr); for (stream = 0; stream < sdp->media_count; ++stream) { if (sdp->media[stream]->conn) { pj_strassign(&sdp->media[stream]->conn->addr, &prm.ret_addr); } } pjsip_tx_data_invalidate_msg(tdata); } return PJ_SUCCESS; }