Add RTPS protocol dissector (#2168)

4 files changed, 83 insertions, 0 deletions

diff --git a/src/include/ndpi_protocol_ids.h b/src/include/ndpi_protocol_ids.h
index e14eb77d7..070f0f137 100644
--- a/src/include/ndpi_protocol_ids.h
+++ b/src/include/ndpi_protocol_ids.h
@@ -387,6 +387,7 @@ typedef enum {
   NDPI_PROTOCOL_SINA_WEIBO            = 356,
   NDPI_PROTOCOL_TESLA_SERVICES        = 357,
   NDPI_PROTOCOL_PTPV2                 = 358,
+  NDPI_PROTOCOL_RTPS                  = 359,
 
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_protocol_ids.h"
diff --git a/src/include/ndpi_protocols.h b/src/include/ndpi_protocols.h
index 7bbbbe9d0..75d8f7080 100644
--- a/src/include/ndpi_protocols.h
+++ b/src/include/ndpi_protocols.h
@@ -252,6 +252,7 @@ void init_protobuf_dissector(struct ndpi_detection_module_struct *ndpi_struct, u
 void init_ethereum_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id);
 void init_ptpv2_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id);
 void init_hart_ip_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id);
+void init_rtps_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id);
 
 /* ndpi_main.c */
 extern u_int32_t ndpi_ip_port_hash_funct(u_int32_t ip, u_int16_t port);
diff --git a/src/lib/ndpi_main.c b/src/lib/ndpi_main.c
index 5b7b76770..ff6bf9d77 100644
--- a/src/lib/ndpi_main.c
+++ b/src/lib/ndpi_main.c
@@ -2134,6 +2134,10 @@ static void ndpi_init_protocol_defaults(struct ndpi_detection_module_struct *ndp
 			  "HART-IP", NDPI_PROTOCOL_CATEGORY_IOT_SCADA,
 			  ndpi_build_default_ports(ports_a, 5094, 0, 0, 0, 0) /* TCP */,
 			  ndpi_build_default_ports(ports_b, 0, 0, 0, 0, 0) /* UDP */);
+  ndpi_set_proto_defaults(ndpi_str, 1 /* cleartext */, 0 /* nw proto */, NDPI_PROTOCOL_ACCEPTABLE, NDPI_PROTOCOL_RTPS,
+			  "RTPS", NDPI_PROTOCOL_CATEGORY_RPC,
+			  ndpi_build_default_ports(ports_a, 0, 0, 0, 0, 0) /* TCP */,
+			  ndpi_build_default_ports(ports_b, 7401, 0, 0, 0, 0) /* UDP */);
 
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_main.c"
@@ -5570,6 +5574,9 @@ static int ndpi_callback_init(struct ndpi_detection_module_struct *ndpi_str) {
   /* Highway Addressable Remote Transducer over IP */
   init_hart_ip_dissector(ndpi_str, &a);
 
+  /* Real-time Publish-Subscribe Protocol */
+  init_rtps_dissector(ndpi_str, &a);
+
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_main_init.c"
 #endif
diff --git a/src/lib/protocols/rtps.c b/src/lib/protocols/rtps.c
new file mode 100644
index 000000000..9b425abd9
--- /dev/null
+++ b/src/lib/protocols/rtps.c
@@ -0,0 +1,74 @@
+/*
+ * rtps.c
+ *
+ * Real-Time Publish Subscribe Protocol
+ * 
+ * Copyright (C) 2023 - ntop.org
+ * Copyright (C) 2023 - V.G <jacendi@protonmail.com>
+ *
+ * This file is part of nDPI, an open source deep packet inspection
+ * library based on the OpenDPI and PACE technology by ipoque GmbH
+ *
+ * nDPI is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * nDPI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with nDPI.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+#include "ndpi_protocol_ids.h"
+
+#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_RTPS
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+/* Check https://www.omg.org/spec/DDSI-RTPS/ 
+ * for updates
+ */
+#define RTPS_LAST_MAJOR_VER 2
+#define RTPS_LAST_MINOR_VER 5
+
+static void ndpi_search_rtps(struct ndpi_detection_module_struct *ndpi_struct,
+                             struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
+
+  NDPI_LOG_DBG(ndpi_struct, "searching RTPS\n");
+
+  if (packet->payload_packet_len >= 16) {
+    if (((memcmp(packet->payload, "RTPS", 4) == 0)    || 
+         (memcmp(packet->payload, "RTPX", 4) == 0))   &&
+        ((packet->payload[4] == RTPS_LAST_MAJOR_VER)  &&  
+         (packet->payload[5] <= RTPS_LAST_MINOR_VER)))
+    {
+      NDPI_LOG_INFO(ndpi_struct, "found RTPS\n");
+      ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_RTPS,
+                                 NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
+      return;
+    }
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+void init_rtps_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("RTPS", ndpi_struct, *id,
+                                      NDPI_PROTOCOL_RTPS,
+                                      ndpi_search_rtps,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK
+                                     );
+
+  *id += 1;
+}