Add CNP/IP protocol support (#2521)

ISO/IEC 14908-4 defines how to tunnel Control Network Protocol (CNP) over IP networks. It encapsulates protocols like EIA-709, EIA-600, and CNP, making it a versatile solution for building automation and control systems.

1 files changed, 67 insertions, 0 deletions

diff --git a/src/lib/protocols/cnp-ip.c b/src/lib/protocols/cnp-ip.c
new file mode 100644
index 000000000..f6d7b1c5d
--- /dev/null
+++ b/src/lib/protocols/cnp-ip.c
@@ -0,0 +1,67 @@
+/*
+ * cnp-ip.c
+ *
+ * Control Network Protocol - IP Communication (ISO/IEC 14908-4)
+ * 
+ * Copyright (C) 2024 - ntop.org
+ * Copyright (C) 2024 - V.G <v.gavrilov@securitycode.ru>
+ *
+ * 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_CNP_IP
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+static void ndpi_int_cnp_ip_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
+                                           struct ndpi_flow_struct *flow)
+{
+  NDPI_LOG_INFO(ndpi_struct, "found CNP-IP\n");
+  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CNP_IP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
+}
+
+static void ndpi_search_cnp_ip(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 CNP-IP\n");
+
+  if (packet->payload_packet_len > 20 && packet->payload_packet_len == ntohs(get_u_int16_t(packet->payload, 0)) &&
+      (packet->payload[3] & 0x1F) == 0x01 && packet->payload[4] == 0 && (packet->payload[5] & 0x1F) < 0x03)
+  {
+    ndpi_int_cnp_ip_add_connection(ndpi_struct, flow);
+    return;
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+void init_cnp_ip_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("CNP-IP", ndpi_struct, *id,
+                                      NDPI_PROTOCOL_CNP_IP,
+                                      ndpi_search_cnp_ip,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}