1 files changed, 132 insertions, 0 deletions
diff --git a/src/lib/protocols/diameter.c b/src/lib/protocols/diameter.c
new file mode 100644
index 000000000..24317f498
--- /dev/null
+++ b/src/lib/protocols/diameter.c
@@ -0,0 +1,132 @@
+/*
+ * aimini.c
+ *
+ * Copyright (C) 2018 - ntop.org
+ * Written by Michele Campus - <campus@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"
+
+#ifdef NDPI_PROTOCOL_DIAMETER
+
+#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_DIAMETER
+
+#include "ndpi_api.h"
+
+
+// Header Flags possibile values
+#define REQUEST   0X80
+#define PROXYABLE 0X40
+#define ERROR     0X20
+#define RETRASM   0X10
+
+typedef enum {
+    AC = 271,
+    AS = 274,
+    CC = 272,
+    CE = 257,
+    DW = 280,
+    DP = 282,
+    RA = 258,
+    ST = 275
+} com_type_t;
+
+#define DIAM_HEADER_LEN 20
+
+// DIAMETER header
+struct diameter_header_t
+{
+  u_int8_t  version;
+  u_int8_t  length[3];
+  u_int8_t  flags;
+  u_int8_t  com_code[3];
+  u_int32_t app_id;
+  u_int32_t hop_id;
+  u_int32_t end_id;
+};
+
+
+// Check packet
+int is_diameter(struct ndpi_packet_struct *packet, int size_payload)
+{
+  // check param
+  if(!packet || size_payload == 0) return -1;
+
+  // cast to diameter header
+  struct diameter_header_t *diameter = (struct diameter_header_t *) packet;
+
+  // check if the packet is diameter
+  if(diameter->version == 0x01 &&
+     (diameter->flags == REQUEST ||
+      diameter->flags == PROXYABLE ||
+      diameter->flags == ERROR ||
+      diameter->flags == RETRASM)) {
+
+    u_int16_t com_code = diameter->com_code[2] + (diameter->com_code[1] << 8) + (diameter->com_code[0] << 8);
+    
+     if(com_code == AC || com_code == AS ||
+	com_code == CC || com_code == CE ||
+	com_code == DW || com_code == DP ||
+	com_code == RA || com_code == ST)
+       return 0; // OK
+  }
+  // wrong packet
+  return -2;
+}
+
+
+void ndpi_search_diameter(struct ndpi_detection_module_struct *ndpi_struct,
+			  struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+
+  // Diameter is on TCP
+  if(packet->tcp) {
+
+    /* Check if it's diameter */
+    int ret = is_diameter(packet, packet->payload_packet_len);
+    if(ret != 0) {
+      NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+      return;
+    }
+    else {
+      NDPI_LOG_INFO(ndpi_struct, "found Diameter\n");
+      ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_DIAMETER, NDPI_PROTOCOL_UNKNOWN);
+    }
+  }
+  else { // UDP
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+}
+
+
+void init_diameter_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
+			 NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+  ndpi_set_bitmask_protocol_detection("Diameter", ndpi_struct, detection_bitmask, *id,
+				      NDPI_PROTOCOL_DIAMETER, ndpi_search_diameter,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN, ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}
+
+#endif /* NDPI_PROTOCOL_DIAMETER */
+