1 files changed, 83 insertions, 0 deletions
diff --git a/src/lib/protocols/nats.c b/src/lib/protocols/nats.c
new file mode 100644
index 000000000..a979fdbb9
--- /dev/null
+++ b/src/lib/protocols/nats.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2020 - ntop.org
+ *
+ * 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"
+#include "ndpi_api.h"
+
+#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_NATS
+
+static const char* commands[] =
+  {
+   "INFO {",
+   "CONNECT {",
+   "PUB ",
+   "SUB",
+   "UNSUB ",
+   "MSG ",
+   "PING",
+   "PONG",
+   "+OK",
+   "-ERR",
+   NULL
+  };
+
+void ndpi_search_nats_tcp(struct ndpi_detection_module_struct *ndpi_struct,
+                            struct ndpi_flow_struct *flow) {
+  struct ndpi_packet_struct *packet = &flow->packet;
+
+  /* Check connection over TCP */
+  NDPI_LOG_DBG(ndpi_struct, "search NATS\n");
+
+  if(packet->tcp && (packet->payload_packet_len > 4)) {
+    int i;
+
+    for(i=0; commands[i] != NULL; i++) {
+      char *match = ndpi_strnstr((const char *)flow->packet.payload,
+				 commands[i],
+				 flow->packet.payload_packet_len);
+
+      if(!match) continue;
+
+      if(ndpi_strnstr((const char *)match, "\r\n",
+		      flow->packet.payload_packet_len - ((unsigned long)flow->packet.payload - (unsigned long)match)) != NULL) {
+	NDPI_LOG_INFO(ndpi_struct, "found NATS\n");
+
+	ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_NATS, NDPI_PROTOCOL_UNKNOWN);
+	return;
+      }
+    }
+
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+  }
+}
+
+
+
+void init_nats_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+			 u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask) {
+  ndpi_set_bitmask_protocol_detection("Nats", ndpi_struct, detection_bitmask, *id,
+				      NDPI_PROTOCOL_NATS,
+				      ndpi_search_nats_tcp,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+				      ADD_TO_DETECTION_BITMASK);
+  *id += 1;
+}