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/*
* 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_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_DHCP, NDPI_PROTOCOL_UNKNOWN);
}
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
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