1 files changed, 84 insertions, 0 deletions
diff --git a/src/lib/protocols/can.c b/src/lib/protocols/can.c
new file mode 100644
index 000000000..618464f70
--- /dev/null
+++ b/src/lib/protocols/can.c
@@ -0,0 +1,84 @@
+/*
+ * can.c
+ *
+ * Copyright (C) 2023 - 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"
+
+#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_CAN
+
+#include "ndpi_api.h"
+
+PACK_ON
+struct can_hdr {
+  uint64_t signature;
+  uint8_t version;
+  uint8_t frames;
+} PACK_OFF;
+
+static void ndpi_int_can_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
+                                        struct ndpi_flow_struct *flow)
+{
+  NDPI_LOG_INFO(ndpi_struct, "found Controller Area Network\n");
+
+  ndpi_set_detected_protocol(ndpi_struct, flow,
+                             NDPI_PROTOCOL_CAN, NDPI_PROTOCOL_UNKNOWN,
+                             NDPI_CONFIDENCE_DPI);
+}
+
+static void ndpi_search_can(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, "search Controller Area Network\n");
+
+  u_int64_t const signature = 0x49534f3131383938; // "ISO11898"
+  if (packet->payload_packet_len < sizeof(struct can_hdr)) {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  struct can_hdr const * const can_header = (struct can_hdr *)packet->payload;
+  if (ndpi_ntohll(can_header->signature) != signature) {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  ndpi_int_can_add_connection(ndpi_struct, flow);
+
+  if (can_header->version != 0x01) {
+    ndpi_set_risk(ndpi_struct, flow, NDPI_MALFORMED_PACKET, "Invalid CAN Header");
+  }
+}
+
+void init_can_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                        u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("Controller_Area_Network", ndpi_struct, *id,
+                                      NDPI_PROTOCOL_CAN,
+                                      ndpi_search_can,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}