Add BFCP protocol support (#2401)

1 files changed, 85 insertions, 0 deletions

diff --git a/src/lib/protocols/bfcp.c b/src/lib/protocols/bfcp.c
new file mode 100644
index 000000000..b2bd52bdb
--- /dev/null
+++ b/src/lib/protocols/bfcp.c
@@ -0,0 +1,85 @@
+/*
+ * bfcp.c
+ *
+ * Binary Floor Control Protocol
+ * 
+ * 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_BFCP
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+static void ndpi_search_bfcp(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 BFCP\n");
+
+  if (packet->payload_packet_len < 12) {
+    goto not_bfcp;
+  }
+
+  u_int8_t version = (packet->payload[0] >> 5) & 0x07;
+  u_int8_t reserved = (packet->payload[0] >> 3) & 0x01;
+
+  if (version != 1 || reserved != 0) {
+    goto not_bfcp;
+  }
+
+  u_int8_t primitive = packet->payload[1];
+  if (primitive < 1 || primitive > 17) {
+    goto not_bfcp;
+  }
+
+  u_int32_t conference_id = ntohl(get_u_int32_t(packet->payload, 4));
+  if (!flow->bfcp_stage) {
+    flow->bfcp_conference_id = conference_id;
+    flow->bfcp_stage = 1;
+    return;
+  }
+
+  if (flow->bfcp_stage && flow->bfcp_conference_id == conference_id) {
+    NDPI_LOG_INFO(ndpi_struct, "found BFCP\n");
+    ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_BFCP,
+                               NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
+    return;
+  }
+
+not_bfcp:
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+void init_bfcp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("BFCP", ndpi_struct, *id,
+                                      NDPI_PROTOCOL_BFCP,
+                                      ndpi_search_bfcp,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}