1 files changed, 98 insertions, 0 deletions
diff --git a/src/lib/protocols/rmcp.c b/src/lib/protocols/rmcp.c
new file mode 100644
index 000000000..366f6eac8
--- /dev/null
+++ b/src/lib/protocols/rmcp.c
@@ -0,0 +1,98 @@
+/*
+ * rmcp.c
+ *
+ * Copyright (C) 2023 - ntop.org
+ *
+ * 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_RMCP
+
+#include "ndpi_api.h"
+
+struct rmcp_header {
+  uint8_t version;
+  uint8_t reserved;
+  uint8_t sequence;
+#if defined(__BIG_ENDIAN__)
+  uint8_t type : 1; // Either Normal RMCP (0) or ACK (1)
+  uint8_t class : 7;
+#elif defined(__LITTLE_ENDIAN__)
+  uint8_t class : 7;
+  uint8_t type : 1; // Either Normal RMCP (0) or ACK (1)
+#else
+#error "Missing endian macro definitions."
+#endif
+};
+
+static void ndpi_int_rmcp_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
+                                         struct ndpi_flow_struct *flow)
+{
+  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_RMCP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
+}
+
+static void ndpi_search_rmcp(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 RMCP\n");
+
+  if (packet->payload_packet_len < sizeof(struct rmcp_header)) {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  struct rmcp_header const * const rmcp_header = (struct rmcp_header *)packet->payload;
+
+  if (rmcp_header->version != 0x06 || rmcp_header->reserved != 0x00) {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  if (rmcp_header->type != 0 && rmcp_header->sequence == 0xFF) {
+    // No ACK allowed if SEQUENCE number is 255.
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  if (rmcp_header->class != 0x06 /* Alert Standard Forum (ASF)*/
+      && rmcp_header->class != 0x07 /* Intelligent Platform Management Interface (IPMI) */)
+  {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  ndpi_int_rmcp_add_connection(ndpi_struct, flow);
+}
+
+
+void init_rmcp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("RMCP", ndpi_struct, *id,
+                                      NDPI_PROTOCOL_RMCP,
+                                      ndpi_search_rmcp,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}
+