1 files changed, 60 insertions, 0 deletions
diff --git a/src/lib/protocols/dhcp.c b/src/lib/protocols/dhcp.c
new file mode 100644
index 000000000..b623a6a15
--- /dev/null
+++ b/src/lib/protocols/dhcp.c
@@ -0,0 +1,60 @@
+/*
+ * dhcp.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_DHCP
+
+static void ndpi_int_dhcp_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_DHCP, NDPI_REAL_PROTOCOL);
+}
+
+
+void ndpi_search_dhcp_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;
+
+	/* this detection also works for asymmetric dhcp traffic */
+
+	/*check standard DHCP 0.0.0.0:68 -> 255.255.255.255:67 */
+	if (packet->payload_packet_len >= 244 && (packet->udp->source == htons(67)
+											  || packet->udp->source == htons(68))
+		&& (packet->udp->dest == htons(67) || packet->udp->dest == htons(68))
+		&& get_u_int32_t(packet->payload, 236) == htonl(0x63825363)
+		&& get_u_int16_t(packet->payload, 240) == htons(0x3501)) {
+
+		NDPI_LOG(NDPI_PROTOCOL_DHCP, ndpi_struct, NDPI_LOG_DEBUG, "DHCP request\n");
+
+		ndpi_int_dhcp_add_connection(ndpi_struct, flow);
+		return;
+	}
+
+	NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_DHCP);
+}
+#endif