Add Microsoft Delivery Optimization protocol (#2799)

1 files changed, 77 insertions, 0 deletions

diff --git a/src/lib/protocols/msdo.c b/src/lib/protocols/msdo.c
new file mode 100644
index 000000000..18aa370a1
--- /dev/null
+++ b/src/lib/protocols/msdo.c
@@ -0,0 +1,77 @@
+/*
+ * msdo.c
+ *
+ * Microsoft Delivery Optimization
+ * 
+ * Copyright (C) 2025 - ntop.org
+ * Copyright (C) 2025 - 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_MSDO
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+static void ndpi_int_msdo_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
+                                         struct ndpi_flow_struct * const flow)
+{
+  NDPI_LOG_INFO(ndpi_struct, "found Microsoft Delivery Optimization protocol\n");
+  ndpi_set_detected_protocol(ndpi_struct, flow,
+                             NDPI_PROTOCOL_MSDO,
+                             NDPI_PROTOCOL_UNKNOWN,
+                             NDPI_CONFIDENCE_DPI);
+}
+
+static void ndpi_search_msdo(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 Microsoft Delivery Optimization protocol\n");
+
+  /* 
+   * Usually the handshake starts with 0x0E and the string "Swarm protocol" at the start of the payload, 
+   * but this may vary.
+   */
+  if (packet->payload_packet_len > 16 && packet->payload[0] == 0x0E)
+  {
+    if (memcmp(&packet->payload[1], "Swarm protocol", NDPI_STATICSTRING_LEN("Swarm protocol")) == 0)
+    {
+      ndpi_int_msdo_add_connection(ndpi_struct, flow);
+      return;
+    }
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+
+void init_msdo_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("MSDO", ndpi_struct, *id,
+              NDPI_PROTOCOL_MSDO,
+              ndpi_search_msdo,
+              NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+              SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+              ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}