res_hep: Capture actual transport type in use

Rather than hard-coding UDP, allow consumers of the HEP API to specify
which protocol is in use. Update the PJSIP provider to pass in the
current protocol type.

ASTERISK-26850 #close

Change-Id: I54bbb0a001cfe4c6a87ad4b6f2014af233349978

include/asterisk/res_hep.h

@@ -72,6 +72,8 @@ struct hepv3_capture_info {
 	size_t len;
 	/*! If non-zero, the payload accompanying this capture info will be compressed */
 	unsigned int zipped:1;
+	/*! The IPPROTO_* protocol where we captured the packet */
+	int protocol_id;
 };
 
 /*!

res/res_hep.c

@@ -439,6 +439,9 @@ struct hepv3_capture_info *hepv3_create_capture_info(const void *payload, size_t
 	memcpy(info->payload, payload, len);
 	info->len = len;
 
+	/* Set a reasonable default */
+	info->protocol_id = IPPROTO_UDP;
+
 	return info;
 }
 
@@ -470,7 +473,7 @@ static int hep_queue_cb(void *data)
 	/* Build HEPv3 header, capture info, and calculate the total packet size */
 	memcpy(hg_pkt.header.id, "\x48\x45\x50\x33", 4);
 
-	INITIALIZE_GENERIC_HEP_CHUNK_DATA(&hg_pkt.ip_proto, CHUNK_TYPE_IP_PROTOCOL_ID, 0x11);
+	INITIALIZE_GENERIC_HEP_CHUNK_DATA(&hg_pkt.ip_proto, CHUNK_TYPE_IP_PROTOCOL_ID, capture_info->protocol_id);
 	INITIALIZE_GENERIC_HEP_CHUNK_DATA(&hg_pkt.src_port, CHUNK_TYPE_SRC_PORT, htons(ast_sockaddr_port(&capture_info->src_addr)));
 	INITIALIZE_GENERIC_HEP_CHUNK_DATA(&hg_pkt.dst_port, CHUNK_TYPE_DST_PORT, htons(ast_sockaddr_port(&capture_info->dst_addr)));
 	INITIALIZE_GENERIC_HEP_CHUNK_DATA(&hg_pkt.time_sec, CHUNK_TYPE_TIMESTAMP_SEC, htonl(capture_info->capture_time.tv_sec));

res/res_hep_pjsip.c

@@ -71,6 +71,15 @@ static char *assign_uuid(const pj_str_t *call_id, const pj_str_t *local_tag, con
 	return uuid;
 }
 
+static int transport_to_protocol_id(pjsip_transport *tp)
+{
+	/* XXX If we ever add SCTP support, we'll need to revisit */
+	if (tp->flag & PJSIP_TRANSPORT_RELIABLE) {
+		return IPPROTO_TCP;
+	}
+	return IPPROTO_UDP;
+}
+
 static pj_status_t logging_on_tx_msg(pjsip_tx_data *tdata)
 {
 	char local_buf[256];
@@ -124,6 +133,7 @@ static pj_status_t logging_on_tx_msg(pjsip_tx_data *tdata)
 	ast_sockaddr_parse(&capture_info->src_addr, local_buf, PARSE_PORT_REQUIRE);
 	ast_sockaddr_parse(&capture_info->dst_addr, remote_buf, PARSE_PORT_REQUIRE);
 
+	capture_info->protocol_id = transport_to_protocol_id(tdata->tp_info.transport);
 	capture_info->capture_time = ast_tvnow();
 	capture_info->capture_type = HEPV3_CAPTURE_TYPE_SIP;
 	capture_info->uuid = uuid;
@@ -183,6 +193,8 @@ static pj_bool_t logging_on_rx_msg(pjsip_rx_data *rdata)
 
 	ast_sockaddr_parse(&capture_info->src_addr, remote_buf, PARSE_PORT_REQUIRE);
 	ast_sockaddr_parse(&capture_info->dst_addr, local_buf, PARSE_PORT_REQUIRE);
+
+	capture_info->protocol_id = transport_to_protocol_id(rdata->tp_info.transport);
 	capture_info->capture_time.tv_sec = rdata->pkt_info.timestamp.sec;
 	capture_info->capture_time.tv_usec = rdata->pkt_info.timestamp.msec * 1000;
 	capture_info->capture_type = HEPV3_CAPTURE_TYPE_SIP;