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/*
* ciscovpn.c
* Copyright (C) 2013 by Remy Mudingay <mudingay@ill.fr>
*
*/
#include "ndpi_protocols.h"
#ifdef NDPI_PROTOCOL_CISCOVPN
static void ndpi_int_ciscovpn_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_CISCOVPN, NDPI_REAL_PROTOCOL);
}
void ndpi_search_ciscovpn(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
u_int16_t udport = 0, usport = 0;
u_int16_t tdport = 0, tsport = 0;
NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "search CISCOVPN.\n");
if(packet->tcp != NULL) {
tsport = ntohs(packet->tcp->source), tdport = ntohs(packet->tcp->dest);
NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "calculated CISCOVPN over tcp ports.\n");
}
if(packet->udp != NULL) {
usport = ntohs(packet->udp->source), udport = ntohs(packet->udp->dest);
NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "calculated CISCOVPN over udp ports.\n");
}
if((tdport == 10000 && tsport == 10000) ||
((tsport == 443 || tdport == 443) &&
(packet->payload[0] == 0x17 &&
packet->payload[1] == 0x01 &&
packet->payload[2] == 0x00 &&
packet->payload[3] == 0x00)
)
)
{
/* This is a good query 17010000*/
NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "found CISCOVPN.\n");
ndpi_int_ciscovpn_add_connection(ndpi_struct, flow);
}
else if(
(
(usport == 10000 && udport == 10000)
&&
(packet->payload[0] == 0xfe &&
packet->payload[1] == 0x57 &&
packet->payload[2] == 0x7e &&
packet->payload[3] == 0x2b)
)
)
{
/* This is a good query fe577e2b */
NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "found CISCOVPN.\n");
ndpi_int_ciscovpn_add_connection(ndpi_struct, flow);
} else {
NDPI_LOG(NDPI_PROTOCOL_CISCOVPN, ndpi_struct, NDPI_LOG_DEBUG, "exclude CISCOVPN.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_CISCOVPN);
}
}
#endif
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