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/*
* soulseek.c
*
* Copyright (C) 2009-2011 by ipoque GmbH
* Copyright (C) 2011-15 - ntop.org
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
*
* nDPI 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.
*
* nDPI 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
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_protocols.h"
#ifdef NDPI_PROTOCOL_SOULSEEK
static void ndpi_int_soulseek_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
struct ndpi_id_struct *src = flow->src;
struct ndpi_id_struct *dst = flow->dst;
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_SOULSEEK/* , NDPI_REAL_PROTOCOL */);
if (src != NULL) {
src->soulseek_last_safe_access_time = packet->tick_timestamp;
}
if (dst != NULL) {
dst->soulseek_last_safe_access_time = packet->tick_timestamp;
}
return;
}
void ndpi_search_soulseek_tcp(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
struct ndpi_id_struct *src = flow->src;
struct ndpi_id_struct *dst = flow->dst;
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG, "Soulseek: search soulseec tcp \n");
if (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_SOULSEEK) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG, "packet marked as Soulseek\n");
if (src != NULL)
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG,
" SRC bitmask: %u, packet tick %llu , last safe access timestamp: %llu\n",
NDPI_COMPARE_PROTOCOL_TO_BITMASK(src->detected_protocol_bitmask, NDPI_PROTOCOL_SOULSEEK)
!= 0 ? 1 : 0, (u_int64_t) packet->tick_timestamp, (u_int64_t) src->soulseek_last_safe_access_time);
if (dst != NULL)
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG,
" DST bitmask: %u, packet tick %llu , last safe ts: %llu\n",
NDPI_COMPARE_PROTOCOL_TO_BITMASK(dst->detected_protocol_bitmask, NDPI_PROTOCOL_SOULSEEK)
!= 0 ? 1 : 0, (u_int64_t) packet->tick_timestamp, (u_int64_t) dst->soulseek_last_safe_access_time);
if (packet->payload_packet_len == 431) {
if (dst != NULL) {
dst->soulseek_last_safe_access_time = packet->tick_timestamp;
}
return;
}
if (packet->payload_packet_len == 12 && get_l32(packet->payload, 4) == 0x02) {
if (src != NULL) {
src->soulseek_last_safe_access_time = packet->tick_timestamp;
if (packet->tcp != NULL && src->soulseek_listen_port == 0) {
src->soulseek_listen_port = get_l32(packet->payload, 8);
return;
}
}
}
if (src != NULL && ((u_int32_t)
(packet->tick_timestamp -
src->soulseek_last_safe_access_time) <
ndpi_struct->soulseek_connection_ip_tick_timeout)) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG,
"Soulseek: SRC update last safe access time and SKIP_FOR_TIME \n");
src->soulseek_last_safe_access_time = packet->tick_timestamp;
}
if (dst != NULL && ((u_int32_t)
(packet->tick_timestamp -
dst->soulseek_last_safe_access_time) <
ndpi_struct->soulseek_connection_ip_tick_timeout)) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG,
"Soulseek: DST update last safe access time and SKIP_FOR_TIME \n");
dst->soulseek_last_safe_access_time = packet->tick_timestamp;
}
}
if (dst != NULL && dst->soulseek_listen_port != 0 && dst->soulseek_listen_port == ntohs(packet->tcp->dest)
&& ((u_int32_t)
(packet->tick_timestamp - dst->soulseek_last_safe_access_time) <
ndpi_struct->soulseek_connection_ip_tick_timeout)) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG,
"Soulseek: Plain detection on Port : %u packet_tick_timestamp: %u soulseeek_last_safe_access_time: %u soulseek_connection_ip_ticktimeout: %u\n",
dst->soulseek_listen_port, packet->tick_timestamp,
dst->soulseek_last_safe_access_time, ndpi_struct->soulseek_connection_ip_tick_timeout);
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
}
if (flow->l4.tcp.soulseek_stage == 0) {
u_int32_t index = 0;
if (packet->payload_packet_len >= 12 && packet->payload_packet_len < 300 && get_l32(packet->payload, 4) == 1) {
while (!get_u_int16_t(packet->payload, index + 2)
&& (index + get_l32(packet->payload, index)) < packet->payload_packet_len - 4) {
if (get_l32(packet->payload, index) < 8) /*Minimum soulsek login msg is 8B */
break;
if (index + get_l32(packet->payload, index) + 4 <= index) {
/* avoid overflow */
break;
}
index += get_l32(packet->payload, index) + 4;
}
if (index + get_l32(packet->payload, index) ==
packet->payload_packet_len - 4 && !get_u_int16_t(packet->payload, 10)) {
/*This structure seems to be soulseek proto */
index = get_l32(packet->payload, 8) + 12; // end of "user name"
if ((index + 4) <= packet->payload_packet_len && !get_u_int16_t(packet->payload, index + 2)) // for passwd len
{
index += get_l32(packet->payload, index) + 4; //end of "Passwd"
if ((index + 4 + 4) <= packet->payload_packet_len && !get_u_int16_t(packet->payload, index + 6)) // to read version,hashlen
{
index += get_l32(packet->payload, index + 4) + 8; // enf of "hash value"
if (index == get_l32(packet->payload, 0)) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK,
ndpi_struct, NDPI_LOG_DEBUG, "Soulseek Login Detected\n");
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
}
}
}
}
}
if (packet->payload_packet_len > 8
&& packet->payload_packet_len < 200 && get_l32(packet->payload, 0) == packet->payload_packet_len - 4) {
//Server Messages:
const u_int32_t msgcode = get_l32(packet->payload, 4);
if (msgcode == 0x7d) {
flow->l4.tcp.soulseek_stage = 1 + packet->packet_direction;
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG, "Soulseek Messages Search\n");
return;
} else if (msgcode == 0x02 && packet->payload_packet_len == 12) {
const u_int32_t soulseek_listen_port = get_l32(packet->payload, 8);
if (src != NULL) {
src->soulseek_last_safe_access_time = packet->tick_timestamp;
if (packet->tcp != NULL && src->soulseek_listen_port == 0) {
src->soulseek_listen_port = soulseek_listen_port;
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct,
NDPI_LOG_DEBUG, "\n Listen Port Saved : %u", src->soulseek_listen_port);
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
}
}
}
//Peer Messages : Peer Init Message Detection
if (get_l32(packet->payload, 0) == packet->payload_packet_len - 4) {
const u_int32_t typelen = get_l32(packet->payload, packet->payload_packet_len - 9);
const u_int8_t type = packet->payload[packet->payload_packet_len - 5];
const u_int32_t namelen = get_l32(packet->payload, 5);
if (packet->payload[4] == 0x01 && typelen == 1
&& namelen <= packet->payload_packet_len
&& (4 + 1 + 4 + namelen + 4 + 1 + 4) ==
packet->payload_packet_len && (type == 'F' || type == 'P' || type == 'D')) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG, "soulseek detected\n");
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
}
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG, "1\n");
}
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG, "3\n");
//Peer Message : Pierce Firewall
if (packet->payload_packet_len == 9 && get_l32(packet->payload, 0) == 5
&& packet->payload[4] <= 0x10 && get_u_int32_t(packet->payload, 5) != 0x00000000) {
flow->l4.tcp.soulseek_stage = 1 + packet->packet_direction;
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_TRACE, "Soulseek Size 9 Pierce Firewall\n");
return;
}
}
if (packet->payload_packet_len > 25 && packet->payload[4] == 0x01 && !get_u_int16_t(packet->payload, 7)
&& !get_u_int16_t(packet->payload, 2)) {
const u_int32_t usrlen = get_l32(packet->payload, 5);
if (usrlen <= packet->payload_packet_len - 4 + 1 + 4 + 4 + 1 + 4) {
const u_int32_t typelen = get_l32(packet->payload, 4 + 1 + 4 + usrlen);
const u_int8_t type = packet->payload[4 + 1 + 4 + usrlen + 4];
if (typelen == 1 && (type == 'F' || type == 'P' || type == 'D')) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct,
NDPI_LOG_DEBUG, "soulseek detected Pattern command(D|P|F).\n");
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
}
}
}
} else if (flow->l4.tcp.soulseek_stage == 2 - packet->packet_direction) {
if (packet->payload_packet_len > 8) {
if ((packet->payload[0] || packet->payload[1]) && get_l32(packet->payload, 4) == 9) {
/* 9 is search result */
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG, "soulseek detected Second Pkt\n");
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
}
if (get_l32(packet->payload, 0) == packet->payload_packet_len - 4) {
const u_int32_t msgcode = get_l32(packet->payload, 4);
if (msgcode == 0x03 && packet->payload_packet_len >= 12) //Server Message : Get Peer Address
{
const u_int32_t usrlen = get_l32(packet->payload, 8);
if (usrlen <= packet->payload_packet_len && 4 + 4 + 4 + usrlen == packet->payload_packet_len) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct,
NDPI_LOG_DEBUG, "Soulseek Request Get Peer Address Detected\n");
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
}
}
}
}
if (packet->payload_packet_len == 8 && get_l32(packet->payload, 4) == 0x00000004) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG, "soulseek detected\n");
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
}
if (packet->payload_packet_len == 4
&& get_u_int16_t(packet->payload, 2) == 0x00 && get_u_int16_t(packet->payload, 0) != 0x00) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG, "soulseek detected\n");
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
} else if (packet->payload_packet_len == 4) {
flow->l4.tcp.soulseek_stage = 3;
return;
}
} else if (flow->l4.tcp.soulseek_stage == 1 + packet->packet_direction) {
if (packet->payload_packet_len > 8) {
if (packet->payload[4] == 0x03 && get_l32(packet->payload, 5) == 0x00000031) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct,
NDPI_LOG_DEBUG, "soulseek detected Second Pkt with SIGNATURE :: 0x0331000000 \n");
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
}
}
}
if (flow->l4.tcp.soulseek_stage == 3 && packet->payload_packet_len == 8 && !get_u_int32_t(packet->payload, 4)) {
NDPI_LOG(NDPI_PROTOCOL_SOULSEEK, ndpi_struct, NDPI_LOG_DEBUG, "soulseek detected bcz of 8B pkt\n");
ndpi_int_soulseek_add_connection(ndpi_struct, flow);
return;
}
if (flow->l4.tcp.soulseek_stage && flow->packet_counter < 11) {
} else {
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SOULSEEK);
}
}
#endif
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