1 files changed, 68 insertions, 0 deletions
diff --git a/src/lib/protocols/ntp.c b/src/lib/protocols/ntp.c
new file mode 100644
index 000000000..7d19968c5
--- /dev/null
+++ b/src/lib/protocols/ntp.c
@@ -0,0 +1,68 @@
+/*
+ * ntp.c
+ *
+ * Copyright (C) 2009-2011 by ipoque GmbH
+ * Copyright (C) 2011-15 - 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_protocols.h"
+#ifdef NDPI_PROTOCOL_NTP
+
+static void ndpi_int_ntp_add_connection(struct ndpi_detection_module_struct
+										  *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+	ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_NTP, NDPI_REAL_PROTOCOL);
+}
+
+/* detection also works asymmetrically */
+
+void ndpi_search_ntp_udp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+	struct ndpi_packet_struct *packet = &flow->packet;
+	
+//      struct ndpi_id_struct         *src=ndpi_struct->src;
+//      struct ndpi_id_struct         *dst=ndpi_struct->dst;
+
+	if (!(packet->udp->dest == htons(123) || packet->udp->source == htons(123)))
+		goto exclude_ntp;
+
+	NDPI_LOG(NDPI_PROTOCOL_NTP, ndpi_struct, NDPI_LOG_DEBUG, "NTP port detected\n");
+
+	if (packet->payload_packet_len != 48)
+		goto exclude_ntp;
+
+	NDPI_LOG(NDPI_PROTOCOL_NTP, ndpi_struct, NDPI_LOG_DEBUG, "NTP length detected\n");
+
+
+	if ((((packet->payload[0] & 0x38) >> 3) <= 4)) {
+		NDPI_LOG(NDPI_PROTOCOL_NTP, ndpi_struct, NDPI_LOG_DEBUG, "detected NTP.");
+		ndpi_int_ntp_add_connection(ndpi_struct, flow);
+		return;
+	}
+
+
+
+  exclude_ntp:
+	NDPI_LOG(NDPI_PROTOCOL_NTP, ndpi_struct, NDPI_LOG_DEBUG, "NTP excluded.\n");
+	NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_NTP);
+}
+
+#endif