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/*
* h323.c
*
* Copyright (C) 2013 Remy Mudingay <mudingay@ill.fr>
*
*/
#include "ndpi_api.h"
#ifdef NDPI_PROTOCOL_OPENVPN
void ndpi_search_openvpn(struct ndpi_detection_module_struct* ndpi_struct,
struct ndpi_flow_struct* flow) {
struct ndpi_packet_struct* packet = &flow->packet;
u_int16_t dport = 0, sport = 0;
if (packet->udp != NULL) {
sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
if ((packet->payload_packet_len >= 25) && (sport == 443 || dport == 443) &&
(packet->payload[0] == 0x17 && packet->payload[1] == 0x01 &&
packet->payload[2] == 0x00 && packet->payload[3] == 0x00)) {
NDPI_LOG(NDPI_PROTOCOL_OPENVPN, ndpi_struct, NDPI_LOG_DEBUG,
"found openvpn udp 443.\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_OPENVPN/* , */
/* NDPI_REAL_PROTOCOL */);
return;
}
if ( ( (packet->payload_packet_len > 40) ||
(packet->payload_packet_len <= 14) ) && // hard-reset
(sport == 1194 || dport == 1194) &&
(packet->payload[0] == 0x30 || packet->payload[0] == 0x31 ||
packet->payload[0] == 0x32 || packet->payload[0] == 0x33 ||
packet->payload[0] == 0x34 || packet->payload[0] == 0x35 ||
packet->payload[0] == 0x36 || packet->payload[0] == 0x37 ||
packet->payload[0] == 0x38 || packet->payload[0] == 0x39)) {
NDPI_LOG(NDPI_PROTOCOL_OPENVPN, ndpi_struct, NDPI_LOG_DEBUG,
"found openvpn broadcast udp STD.\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_OPENVPN/* , */
/* NDPI_REAL_PROTOCOL */);
return;
}
}
if (packet->tcp != NULL) {
sport = ntohs(packet->tcp->source), dport = ntohs(packet->tcp->dest);
if ((packet->payload_packet_len >= 40) &&
(sport == 1194 || dport == 1194) &&
((packet->payload[0] == 0x00) && (packet->payload[1] == 0x2a) &&
(packet->payload[2] == 0x38))) {
NDPI_LOG(NDPI_PROTOCOL_OPENVPN, ndpi_struct, NDPI_LOG_DEBUG,
"found openvpn broadcast udp STD.\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_OPENVPN/* , */
/* NDPI_REAL_PROTOCOL */);
return;
}
}
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask,
NDPI_PROTOCOL_OPENVPN);
}
#endif
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