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/*
* citrix.c
*
* Copyright (C) 2012-15 - 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_api.h"
#ifdef NDPI_PROTOCOL_CITRIX
/* ************************************ */
static void ndpi_check_citrix(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
u_int32_t payload_len = packet->payload_packet_len;
#if 0
printf("[len=%u][%02X %02X %02X %02X]\n", payload_len,
packet->payload[0] & 0xFF,
packet->payload[1] & 0xFF,
packet->payload[2] & 0xFF,
packet->payload[3] & 0xFF);
#endif
if(packet->tcp != NULL) {
flow->l4.tcp.citrix_packet_id++;
if((flow->l4.tcp.citrix_packet_id == 3)
/* We have seen the 3-way handshake */
&& flow->l4.tcp.seen_syn
&& flow->l4.tcp.seen_syn_ack
&& flow->l4.tcp.seen_ack) {
if(payload_len == 6) {
char citrix_header[] = { 0x07, 0x07, 0x49, 0x43, 0x41, 0x00 };
if(memcmp(packet->payload, citrix_header, sizeof(citrix_header)) == 0) {
NDPI_LOG(NDPI_PROTOCOL_CITRIX, ndpi_struct, NDPI_LOG_DEBUG, "Found citrix.\n");
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_CITRIX, NDPI_REAL_PROTOCOL);
}
return;
} else if(payload_len > 4) {
char citrix_header[] = { 0x1a, 0x43, 0x47, 0x50, 0x2f, 0x30, 0x31 };
if((memcmp(packet->payload, citrix_header, sizeof(citrix_header)) == 0)
|| (ndpi_strnstr((const char *)packet->payload, "Citrix.TcpProxyService", payload_len) != NULL)) {
NDPI_LOG(NDPI_PROTOCOL_CITRIX, ndpi_struct, NDPI_LOG_DEBUG, "Found citrix.\n");
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_CITRIX, NDPI_REAL_PROTOCOL);
}
return;
}
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_CITRIX);
} else if(flow->l4.tcp.citrix_packet_id > 3)
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_CITRIX);
return;
}
}
void ndpi_search_citrix(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
NDPI_LOG(NDPI_PROTOCOL_CITRIX, ndpi_struct, NDPI_LOG_DEBUG, "citrix detection...\n");
/* skip marked packets */
if(packet->detected_protocol_stack[0] != NDPI_PROTOCOL_CITRIX)
ndpi_check_citrix(ndpi_struct, flow);
}
#endif
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