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/*
* hangout.c
*
* Copyright (C) 2012-16 - ntop.org
*
* This module 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.
*
* This module 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.
* If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_api.h"
#ifdef NDPI_PROTOCOL_HANGOUT
/* https://support.google.com/a/answer/1279090?hl=en */
#define HANGOUT_UDP_LOW_PORT 19302
#define HANGOUT_UDP_HIGH_PORT 19309
#define HANGOUT_TCP_LOW_PORT 19305
#define HANGOUT_TCP_HIGH_PORT 19309
/* ***************************************************************** */
static u_int8_t isHangoutUDPPort(u_int16_t port) {
if((port >= HANGOUT_UDP_LOW_PORT) && (port <= HANGOUT_UDP_HIGH_PORT))
return(1);
else
return(0);
}
/* ***************************************************************** */
static u_int8_t isHangoutTCPPort(u_int16_t port) {
if((port >= HANGOUT_TCP_LOW_PORT) && (port <= HANGOUT_TCP_HIGH_PORT))
return(1);
else
return(0);
}
/* ******************************************* */
static u_int8_t google_ptree_match(struct ndpi_detection_module_struct *ndpi_struct, struct in_addr *pin) {
return((ndpi_network_ptree_match(ndpi_struct, pin) == NDPI_PROTOCOL_GOOGLE) ? 1 : 0);
}
/* ******************************************* */
static u_int8_t is_google_flow(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &flow->packet;
if(packet->iph) {
if(google_ptree_match(ndpi_struct, (struct in_addr *)&packet->iph->saddr)
|| google_ptree_match(ndpi_struct, (struct in_addr *)&packet->iph->daddr)) {
return(1);
}
}
return(0);
}
/* ***************************************************************** */
void ndpi_search_hangout(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct * packet = &flow->packet;
if((packet->payload_packet_len > 24) && is_google_flow(ndpi_struct, flow)) {
if(
((packet->udp != NULL) && (isHangoutUDPPort(ntohs(packet->udp->source)) || isHangoutUDPPort(ntohs(packet->udp->dest))))
||
((packet->tcp != NULL) && (isHangoutTCPPort(ntohs(packet->tcp->source)) || isHangoutTCPPort(ntohs(packet->tcp->dest))))) {
NDPI_LOG(NDPI_PROTOCOL_HANGOUT, ndpi_struct, NDPI_LOG_DEBUG, "Found Hangout.\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_HANGOUT, NDPI_PROTOCOL_UNKNOWN);
return;
}
}
NDPI_LOG(NDPI_PROTOCOL_HANGOUT, ndpi_struct, NDPI_LOG_DEBUG, "No Hangout.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_HANGOUT);
}
/* ***************************************************************** */
void init_hangout_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
NDPI_PROTOCOL_BITMASK *detection_bitmask) {
ndpi_set_bitmask_protocol_detection("GoogleHangout", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_HANGOUT,
ndpi_search_hangout,
NDPI_SELECTION_BITMASK_PROTOCOL_TCP_OR_UDP,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
#endif /* NDPI_PROTOCOL_HANGOUT */
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