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/*
* viber.c
*
* Copyright (C) 2013 Remy Mudingay <mudingay@ill.fr>
* Copyright (C) 2013-18 - 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_VIBER
#include "ndpi_api.h"
#include "ndpi_private.h"
static void viber_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found Viber\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_VIBER,
NDPI_PROTOCOL_UNKNOWN,
NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_viber(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 for Viber\n");
if(packet->udp && packet->iph) {
/* ignore broadcast as this isn't viber */
if((packet->iph->saddr == 0xFFFFFFFF) || (packet->iph->daddr == 0xFFFFFFFF)) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
}
if (packet->tcp != NULL)
{
NDPI_LOG_DBG2(ndpi_struct, "searching Viber over tcp\n");
if (packet->payload_packet_len >= 11 &&
le16toh(get_u_int16_t(packet->payload, 0)) == packet->payload_packet_len)
{
if (ntohs(get_u_int16_t(packet->payload, 6)) == 0xfcff &&
packet->payload[9] == 0x80)
{
viber_add_connection(ndpi_struct, flow);
return;
}
if (ntohs(get_u_int16_t(packet->payload, 4)) == 0x0380 &&
packet->payload[10] == 0x0a)
{
viber_add_connection(ndpi_struct, flow);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if((packet->udp != NULL) && (packet->payload_packet_len > 5)) {
NDPI_LOG_DBG2(ndpi_struct, "calculating dport over udp\n");
if((flow->rtp_stage == 0) && (flow->rtcp_stage == 0) /* Avoid collisions with RTP/RTCP */ &&
((packet->payload[2] == 0x03 && packet->payload[3] == 0x00)
|| (packet->payload_packet_len == 20 && packet->payload[2] == 0x09 && packet->payload[3] == 0x00)
|| (packet->payload[2] == 0x01 && packet->payload[3] == 0x00 && packet->payload[4] == 0x05 && packet->payload[5] == 0x00)
|| (packet->payload_packet_len == 34 && packet->payload[2] == 0x19 && packet->payload[3] == 0x00)
|| (packet->payload_packet_len == 34 && packet->payload[2] == 0x1b && packet->payload[3] == 0x00)
)) {
viber_add_connection(ndpi_struct, flow);
return;
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if(flow->packet_counter > 3)
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_viber_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("Viber", ndpi_struct, *id,
NDPI_PROTOCOL_VIBER,
ndpi_search_viber,
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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