mirror of
https://github.com/vel21ripn/nDPI.git
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95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
/*
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* citrix.c
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*
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* Copyright (C) 2012-19 - ntop.org
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*
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* This file is part of nDPI, an open source deep packet inspection
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* library based on the OpenDPI and PACE technology by ipoque GmbH
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*
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* nDPI is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* nDPI is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "ndpi_protocol_ids.h"
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#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_CITRIX
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#include "ndpi_api.h"
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/* ************************************ */
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static void ndpi_check_citrix(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
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{
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struct ndpi_packet_struct *packet = &flow->packet;
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u_int32_t payload_len = packet->payload_packet_len;
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if(packet->tcp != NULL) {
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flow->l4.tcp.citrix_packet_id++;
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if((flow->l4.tcp.citrix_packet_id == 3)
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/* We have seen the 3-way handshake */
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&& flow->l4.tcp.seen_syn
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&& flow->l4.tcp.seen_syn_ack
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&& flow->l4.tcp.seen_ack) {
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if(payload_len == 6) {
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char citrix_header[] = { 0x07, 0x07, 0x49, 0x43, 0x41, 0x00 };
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if(memcmp(packet->payload, citrix_header, sizeof(citrix_header)) == 0) {
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NDPI_LOG_INFO(ndpi_struct, "found citrix\n");
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ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CITRIX, NDPI_PROTOCOL_UNKNOWN);
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}
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return;
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} else if(payload_len > 4) {
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char citrix_header[] = { 0x1a, 0x43, 0x47, 0x50, 0x2f, 0x30, 0x31 };
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if((memcmp(packet->payload, citrix_header, sizeof(citrix_header)) == 0)
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|| (ndpi_strnstr((const char *)packet->payload, "Citrix.TcpProxyService", payload_len) != NULL)) {
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NDPI_LOG_INFO(ndpi_struct, "found citrix\n");
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ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CITRIX, NDPI_PROTOCOL_UNKNOWN);
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}
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return;
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}
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NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
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} else if(flow->l4.tcp.citrix_packet_id > 3) {
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NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
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}
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return;
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}
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}
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void ndpi_search_citrix(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
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{
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struct ndpi_packet_struct *packet = &flow->packet;
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NDPI_LOG_DBG(ndpi_struct, "search citrix\n");
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/* skip marked packets */
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if(packet->detected_protocol_stack[0] != NDPI_PROTOCOL_CITRIX)
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ndpi_check_citrix(ndpi_struct, flow);
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}
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void init_citrix_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
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{
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ndpi_set_bitmask_protocol_detection("Citrix", ndpi_struct, detection_bitmask, *id,
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NDPI_PROTOCOL_CITRIX,
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ndpi_search_citrix,
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NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
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SAVE_DETECTION_BITMASK_AS_UNKNOWN,
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ADD_TO_DETECTION_BITMASK);
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*id += 1;
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}
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