Add DingTalk protocol support (#2581)

1 files changed, 63 insertions, 0 deletions

diff --git a/src/lib/protocols/dingtalk.c b/src/lib/protocols/dingtalk.c
new file mode 100644
index 000000000..25aea3f99
--- /dev/null
+++ b/src/lib/protocols/dingtalk.c
@@ -0,0 +1,63 @@
+/*
+ * dingtalk.c
+ *
+ * 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_DINGTALK
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+static void ndpi_search_dingtalk(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 DingTalk\n");
+
+  if (packet->payload_packet_len > 90 && packet->payload[0] == 0x10)
+  {
+    if (ntohl(get_u_int32_t(packet->payload, 2)) == 0x87800100 &&
+        ntohl(get_u_int32_t(packet->payload, 6)) == 0x1000200  &&
+        ntohl(get_u_int32_t(packet->payload, 10)) == 0x2646B03 && ntohs(get_u_int16_t(packet->payload, 14)) == 0x20)
+    {
+      NDPI_LOG_INFO(ndpi_struct, "found DingTalk\n");
+      ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_DINGTALK,
+                                 NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
+      return;
+    }
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+void init_dingtalk_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("DingTalk", ndpi_struct, *id,
+				      NDPI_PROTOCOL_DINGTALK,
+				      ndpi_search_dingtalk,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+				      ADD_TO_DETECTION_BITMASK);
+  *id += 1;
+}