Add Automatic Tank Gauge protocol (#2527)

See also #2523

---------

Co-authored-by: Nardi Ivan <nardi.ivan@gmail.com>

4 files changed, 76 insertions, 0 deletions

diff --git a/src/include/ndpi_private.h b/src/include/ndpi_private.h
index ae732f624..4fb1afccf 100644
--- a/src/include/ndpi_private.h
+++ b/src/include/ndpi_private.h
@@ -933,6 +933,7 @@ void init_cloudflare_warp_dissector(struct ndpi_detection_module_struct *ndpi_st
 void init_nano_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id);
 void init_openwire_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id);
 void init_cnp_ip_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id);
+void init_atg_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id);
 
 #endif
 
diff --git a/src/include/ndpi_protocol_ids.h b/src/include/ndpi_protocol_ids.h
index 0f1b5e2d0..b465626b9 100644
--- a/src/include/ndpi_protocol_ids.h
+++ b/src/include/ndpi_protocol_ids.h
@@ -451,6 +451,7 @@ typedef enum {
   NDPI_PROTOCOL_NANO                  = 420,
   NDPI_PROTOCOL_OPENWIRE              = 421,
   NDPI_PROTOCOL_CNP_IP                = 422,
+  NDPI_PROTOCOL_ATG                   = 423,
 
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_protocol_ids.h"
diff --git a/src/lib/ndpi_main.c b/src/lib/ndpi_main.c
index 983fadef6..b496888cb 100644
--- a/src/lib/ndpi_main.c
+++ b/src/lib/ndpi_main.c
@@ -2302,6 +2302,10 @@ static void ndpi_init_protocol_defaults(struct ndpi_detection_module_struct *ndp
 			  "CNP-IP", NDPI_PROTOCOL_CATEGORY_IOT_SCADA,
 			  ndpi_build_default_ports(ports_a, 0, 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_ATG,
+			  "ATG", NDPI_PROTOCOL_CATEGORY_IOT_SCADA,
+			  ndpi_build_default_ports(ports_a, 0, 0, 0, 0, 0) /* TCP */,
+			  ndpi_build_default_ports(ports_b, 0, 0, 0, 0, 0) /* UDP */);
 
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_main.c"
@@ -6259,6 +6263,9 @@ static int ndpi_callback_init(struct ndpi_detection_module_struct *ndpi_str) {
   /* ISO/IEC 14908-4 */
   init_cnp_ip_dissector(ndpi_str, &a);
 
+  /* ATG */
+  init_atg_dissector(ndpi_str, &a);
+
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_main_init.c"
 #endif
diff --git a/src/lib/protocols/atg.c b/src/lib/protocols/atg.c
new file mode 100644
index 000000000..cc25a70ce
--- /dev/null
+++ b/src/lib/protocols/atg.c
@@ -0,0 +1,67 @@
+/*
+ * atg.c
+ *
+ * Copyright (C) 2024 - ntop.org
+ *
+ * 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_ATG
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+static void ndpi_int_atg_add_connection(struct ndpi_detection_module_struct
+						*ndpi_struct, struct ndpi_flow_struct *flow) {
+  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ATG,
+			     NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
+}
+
+
+static void ndpi_search_atg(struct ndpi_detection_module_struct *ndpi_struct,
+				    struct ndpi_flow_struct *flow) {
+  struct ndpi_packet_struct *packet = &ndpi_struct->packet;
+
+  NDPI_LOG_DBG(ndpi_struct, "search for ATG\n");
+
+  if(packet->payload_packet_len >= 8) {
+    u_int16_t atg_port = ntohs(10001);
+
+    if((packet->tcp->source == atg_port) || (packet->tcp->dest == atg_port)) {
+      if(packet->payload[0] == 0x01 &&
+         (packet->payload[1] == 0x49 || packet->payload[1] == 0x69 || packet->payload[1] == 0x53 || packet->payload[1] == 0x73 ) &&
+         memcmp(&packet->payload[packet->payload_packet_len - 2], "\r\n", 2) == 0) {
+        NDPI_LOG_INFO(ndpi_struct, "found atg\n");
+        ndpi_int_atg_add_connection(ndpi_struct, flow);
+        return;
+      }
+    }
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+void init_atg_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                        u_int32_t *id) {
+  ndpi_set_bitmask_protocol_detection("ATG", ndpi_struct, *id,
+				      NDPI_PROTOCOL_ATG,
+				      ndpi_search_atg,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+				      ADD_TO_DETECTION_BITMASK);
+  *id += 1;
+}