Add CryNetwork dissector.add/crynet

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/src/lib/protocols/crynet.c b/src/lib/protocols/crynet.c
new file mode 100644
index 000000000..2b7203b1f
--- /dev/null
+++ b/src/lib/protocols/crynet.c
@@ -0,0 +1,81 @@
+/*
+ * crynet.c
+ *
+ * Copyright (C) 2022 - 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_CRYNET
+
+#include "ndpi_api.h"
+
+static void ndpi_int_crynet_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
+                                           struct ndpi_flow_struct * const flow)
+{
+  NDPI_LOG_INFO(ndpi_struct, "found crynetwork\n");
+  ndpi_set_detected_protocol(ndpi_struct, flow,
+                             NDPI_PROTOCOL_CRYNET,
+                             NDPI_PROTOCOL_UNKNOWN,
+                             NDPI_CONFIDENCE_DPI);
+}
+
+void ndpi_search_crynet(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 crynetwork\n");
+
+  if (packet->payload_packet_len < 26)
+  {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  if (packet->payload_packet_len != packet->payload[0] + 10)
+  {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  if (ntohs(get_u_int16_t(packet->payload, 3)) != 0x08ed ||
+      packet->payload[16] != 0x01 ||
+      packet->payload[20] != 0x07 ||
+      ntohs(get_u_int16_t(packet->payload, 24)) != 0x0307)
+  {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  ndpi_int_crynet_add_connection(ndpi_struct, flow);
+}
+
+void init_crynet_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                           u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+  ndpi_set_bitmask_protocol_detection("CryNetwork", ndpi_struct, detection_bitmask, *id,
+    NDPI_PROTOCOL_CRYNET,
+    ndpi_search_crynet,
+    NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+    SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+    ADD_TO_DETECTION_BITMASK
+  );
+
+  *id += 1;
+}