Added DICOM support

Testing pcaps courtesy of https://github.com/virtalabs/tapirx.git

1 files changed, 75 insertions, 0 deletions

diff --git a/src/lib/protocols/dicom.c b/src/lib/protocols/dicom.c
new file mode 100644
index 000000000..d8abf9ed9
--- /dev/null
+++ b/src/lib/protocols/dicom.c
@@ -0,0 +1,75 @@
+/*
+ * dicom.c
+ *
+ * Copyright (C) 2012-24 - 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_DICOM
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+PACK_ON struct dicom_header {
+  u_int8_t pdu_type, pad;
+  u_int32_t pdu_len;
+} PACK_OFF;
+
+/* ********************************* */
+
+static void ndpi_search_dicom(struct ndpi_detection_module_struct *ndpi_struct,
+				 struct ndpi_flow_struct *flow) {
+  struct ndpi_packet_struct *packet = &ndpi_struct->packet;
+  u_int16_t dicom_port = ntohs(104);
+
+  NDPI_LOG_DBG(ndpi_struct, "search DICOM\n");
+
+  if(packet->iph && (packet->payload_packet_len > sizeof(struct dicom_header))) {
+    if(packet->tcp->dest == dicom_port) {
+      struct dicom_header *h = (struct dicom_header*)packet->payload;
+
+      if((h->pdu_type == 0x01 /* A-ASSOCIATE */)
+	 && (h->pad == 0x0)
+	 && (packet->payload_packet_len <= (ntohl(h->pdu_len)+6))
+	 && (packet->payload_packet_len > 9)
+	 && (packet->payload[6] == 0x0) && (packet->payload[7] == 0x1) /* Protocol Version */
+	 && (packet->payload[8] == 0x0) && (packet->payload[9] == 0x0) /* Pad */
+	 
+	) {
+	ndpi_set_detected_protocol(ndpi_struct, flow,
+				   NDPI_PROTOCOL_DICOM,
+				   NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
+      } else
+	NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    } else if(packet->tcp->dest != dicom_port)
+      NDPI_EXCLUDE_PROTO(ndpi_struct, flow); /* At least one port must be the DICOM port */
+  } else
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+/* ********************************* */
+
+void init_dicom_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+			     u_int32_t *id) {
+  ndpi_set_bitmask_protocol_detection("DICOM", ndpi_struct,
+				      *id, NDPI_PROTOCOL_DICOM, ndpi_search_dicom,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+				      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}