diff options
| -rw-r--r-- | src/lib/protocols/dhcp.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/src/lib/protocols/dhcp.c b/src/lib/protocols/dhcp.c index 8ffc04d51..e33a7c011 100644 --- a/src/lib/protocols/dhcp.c +++ b/src/lib/protocols/dhcp.c @@ -1,8 +1,7 @@ /* * dhcp.c * - * Copyright (C) 2009-2011 by ipoque GmbH - * Copyright (C) 2011-15 - ntop.org + * Copyright (C) 2016 - 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 @@ -43,16 +42,18 @@ void ndpi_search_dhcp_udp(struct ndpi_detection_module_struct *ndpi_struct, stru /* 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; + if(packet->udp) { + 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); |