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/*
* hangout.c
*
* Copyright (C) 2012-22 - 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_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_HANGOUT_DUO
/* #define DEBUG_LRU 1 */
#include "ndpi_api.h"
/* stun.c */
extern u_int32_t get_stun_lru_key(struct ndpi_flow_struct *flow, u_int8_t rev);
/* 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);
}
/* ***************************************************************** */
void ndpi_search_hangout(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct * packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search Hangout\n");
if((packet->payload_packet_len > 24) && flow->guessed_protocol_id_by_ip == NDPI_PROTOCOL_GOOGLE) {
int matched_src = 0;
if(
((packet->udp != NULL) && (matched_src = isHangoutUDPPort(ntohs(packet->udp->source))
|| isHangoutUDPPort(ntohs(packet->udp->dest))))
||
((packet->tcp != NULL) && (matched_src = isHangoutTCPPort(ntohs(packet->tcp->source))
|| isHangoutTCPPort(ntohs(packet->tcp->dest))))) {
NDPI_LOG_INFO(ndpi_struct, "found Hangout\n");
/* Hangout is over STUN hence the LRU cache is shared */
if(ndpi_struct->stun_cache && packet->iph) {
u_int32_t key = get_stun_lru_key(flow, !matched_src);
#ifdef DEBUG_LRU
printf("[LRU] ADDING %u / %u.%u\n", key, NDPI_PROTOCOL_STUN, NDPI_PROTOCOL_HANGOUT_DUO);
#endif
ndpi_lru_add_to_cache(ndpi_struct->stun_cache, key, NDPI_PROTOCOL_HANGOUT_DUO);
}
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_HANGOUT_DUO,
NDPI_PROTOCOL_STUN, NDPI_CONFIDENCE_DPI);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
/* ***************************************************************** */
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_DUO,
ndpi_search_hangout,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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