Implemented Mikrotik discovery protocol dissection and metadata extraction (#2618)

1 files changed, 120 insertions, 0 deletions

diff --git a/src/lib/protocols/mikrotik.c b/src/lib/protocols/mikrotik.c
new file mode 100644
index 000000000..b1d315581
--- /dev/null
+++ b/src/lib/protocols/mikrotik.c
@@ -0,0 +1,120 @@
+/*
+ * mikrotik.c
+ *
+ * Copyright (C) 2012-24 - 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_MIKROTIK
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+/* ********************************* */
+
+static void ndpi_search_mikrotik(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 MIKROTIK\n");
+
+  if((packet->iph && (packet->iph->daddr== 0xFFFFFFFF))
+     || (packet->iphv6 && (ntohl(packet->iphv6->ip6_dst.u6_addr.u6_addr32[0]) == 0xFF020000 /* ff02:: */))
+    ) {
+    if(ntohs(packet->udp->dest) == 5678) {
+      const u_int8_t *payload;
+      u_int16_t offset;
+    
+      if (packet->payload_packet_len < 8) {
+	NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+	return;
+      } else {
+	offset = 4;
+	payload = packet->payload;
+      }
+
+      while((offset+4) < packet->payload_packet_len) {
+	u_int16_t m_type = ((u_int16_t)payload[offset] << 8) + payload[offset+1];
+	u_int16_t m_len  = ((u_int16_t)payload[offset+2] << 8) + payload[offset+3];
+
+	// printf("%d\n", m_type);
+
+	if((m_len+offset) < packet->payload_packet_len) {
+	  switch(m_type) {
+	  case 1 /* MAC Address */:
+	    if(m_len == 6)
+	      memcpy(flow->protos.mikrotik.mac_addr, &payload[offset+4], m_len);
+	    break;
+	  case 5 /* Identity */:
+	    snprintf(flow->protos.mikrotik.identity, sizeof(flow->protos.mikrotik.identity), 
+		     "%.*s", m_len, &payload[offset+4]);
+	    break;
+	  case 7 /* Version */:
+	    snprintf(flow->protos.mikrotik.version, sizeof(flow->protos.mikrotik.version), 
+		     "%.*s", m_len, &payload[offset+4]);
+	    break;
+	  case 10: /* Uptime */
+	    if(m_len == 4)
+	      flow->protos.mikrotik.uptime = ntohl(*((u_int32_t*)&payload[offset+4]));
+	    break;
+	  case 11: /* Software-ID */
+	    snprintf(flow->protos.mikrotik.sw_id, sizeof(flow->protos.mikrotik.sw_id), 
+		     "%.*s", m_len, &payload[offset+4]);
+	    break;
+	  case 12: /* Board */
+	    snprintf(flow->protos.mikrotik.board, sizeof(flow->protos.mikrotik.board), 
+		     "%.*s", m_len, &payload[offset+4]);
+	    break;
+	  case 15: /* IPv6 */
+	    if(m_len == 16)
+	      memcpy(&flow->protos.mikrotik.ipv6_addr, &payload[offset+4], m_len);
+	    break;
+	  case 16: /* Interface Name */
+	    snprintf(flow->protos.mikrotik.iface_name, sizeof(flow->protos.mikrotik.iface_name), 
+		     "%.*s", m_len, &payload[offset+4]);
+	    break;
+	  case 14: /* IPv4 */
+	    if(m_len == 4)
+	      flow->protos.mikrotik.ipv4_addr = ntohl(*((u_int32_t*)&payload[offset+4]));
+	    break;
+	  }
+      
+	  offset += 4 + m_len;
+	} else
+	  break;
+      } /* while */
+    
+      ndpi_set_detected_protocol(ndpi_struct, flow,
+				 NDPI_PROTOCOL_MIKROTIK,
+				 NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
+    }
+  } else
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+/* ********************************* */
+
+void init_mikrotik_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+			     u_int32_t *id) {
+  ndpi_set_bitmask_protocol_detection("MIKROTIK", ndpi_struct,
+				      *id, NDPI_PROTOCOL_MIKROTIK, ndpi_search_mikrotik,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+				      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}