Add Yojimbo (netcode) protocol dissector (#2277)

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

1 files changed, 72 insertions, 0 deletions

diff --git a/src/lib/protocols/yojimbo.c b/src/lib/protocols/yojimbo.c
new file mode 100644
index 000000000..d59fa3e90
--- /dev/null
+++ b/src/lib/protocols/yojimbo.c
@@ -0,0 +1,72 @@
+/*
+ * yojimbo.c
+ *
+ * Copyright (C) 2024 - 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_YOJIMBO
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+static void ndpi_int_yojimbo_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
+                                            struct ndpi_flow_struct * const flow)
+{
+  NDPI_LOG_INFO(ndpi_struct, "found yojimbo\n");
+  ndpi_set_detected_protocol(ndpi_struct, flow,
+                             NDPI_PROTOCOL_YOJIMBO,
+                             NDPI_PROTOCOL_UNKNOWN,
+                             NDPI_CONFIDENCE_DPI);
+}
+
+static void ndpi_search_yojimbo(struct ndpi_detection_module_struct *ndpi_struct,
+                                struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
+  uint64_t const magic = 0x4e4554434f444520; // "NETCODE "
+
+  if (packet->payload_packet_len < 9)
+  {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  if (packet->payload[0] == 0x00 &&
+      get_u_int64_t(packet->payload, 1) == ndpi_htonll(magic))
+  {
+    ndpi_int_yojimbo_add_connection(ndpi_struct, flow);
+    return;
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+void init_yojimbo_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                            u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("Yojimbo", ndpi_struct, *id,
+                                      NDPI_PROTOCOL_YOJIMBO,
+                                      ndpi_search_yojimbo,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}
+