/*
* irc.c
*
* Copyright (C) 2009-2011 by ipoque GmbH
* Copyright (C) 2011-19 - 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_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_IRC
#include "ndpi_api.h"
#define NDPI_IRC_FIND_LESS(time_err,less) {int t1 = 0; \
u_int32_t timestamp = time_err[0]; \
for(t1=0;t1 < NDPI_PROTOCOL_IRC_MAXPORT;t1++) { \
if(timestamp > time_err[t1]) { \
timestamp = time_err[t1]; \
less = t1;}}}
static void ndpi_int_irc_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_IRC, NDPI_PROTOCOL_UNKNOWN);
}
#if !defined(WIN32)
static inline
#elif defined(MINGW_GCC)
__mingw_forceinline static
#else
__forceinline static
#endif
u_int8_t ndpi_is_duplicate(struct ndpi_id_struct *id_t, u_int16_t port)
{
int index = 0;
while (index < id_t->irc_number_of_port) {
if (port == id_t->irc_port[index])
return 1;
index++;
}
return 0;
}
static u_int8_t ndpi_check_for_NOTICE_or_PRIVMSG(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
//
u_int16_t i;
u_int8_t number_of_lines_to_be_searched_for = 0;
for (i = 0; i < packet->payload_packet_len - 7; i++) {
if (packet->payload[i] == 'N' || packet->payload[i] == 'P') {
if (memcmp(&packet->payload[i + 1], "OTICE ", 6) == 0 || memcmp(&packet->payload[i + 1], "RIVMSG ", 7) == 0) {
NDPI_LOG_DBG2(ndpi_struct, "found NOTICE or PRIVMSG\n");
return 1;
}
}
if (packet->payload[i] == 0x0a) {
number_of_lines_to_be_searched_for++;
if (number_of_lines_to_be_searched_for == 2) {
return 0;
}
}
}
return 0;
}
static u_int8_t ndpi_check_for_Nickname(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
u_int16_t i, packetl = packet->payload_packet_len;
if (packetl < 4) {
return 0;
}
for (i = 0; i < (packetl - 4); i++) {
if (packet->payload[i] == 'N' || packet->payload[i] == 'n') {
if ((((packetl - (i + 1)) >= 4) && memcmp(&packet->payload[i + 1], "ick=", 4) == 0)
|| (((packetl - (i + 1)) >= 8) && (memcmp(&packet->payload[i + 1], "ickname=", 8) == 0))
|| (((packetl - (i + 1)) >= 8) && (memcmp(&packet->payload[i + 1], "ickName=", 8) == 0))) {
NDPI_LOG_DBG2(ndpi_struct, "found HTTP IRC Nickname pattern\n");
return 1;
}
}
}
return 0;
}
static u_int8_t ndpi_check_for_cmd(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
u_int16_t i;
if (packet->payload_packet_len < 4) {
return 0;
}
for (i = 0; i < packet->payload_packet_len - 4; i++) {
if (packet->payload[i] == 'c') {
if (memcmp(&packet->payload[i + 1], "md=", 3) == 0) {
NDPI_LOG_DBG2(ndpi_struct, "found HTTP IRC cmd pattern \n");
return 1;
}
}
}
return 0;
}
static u_int8_t ndpi_check_for_IRC_traces(const u_int8_t * ptr, u_int16_t len)
{
u_int16_t i;
if (len < 4) {
return 0;
}
for (i = 0; i < len - 4; i++) {
if (ptr[i] == 'i') {
if (memcmp(&ptr[i + 1], "rc.", 3) == 0) {
return 1;
}
}
}
return 0;
}
u_int8_t ndpi_search_irc_ssl_detect_ninety_percent_but_very_fast(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
NDPI_LOG_DBG(ndpi_struct, "start fast detect\n");
/* case 1: len 1460, len 1460, len 1176 several times in one direction, than len = 4, 4096, 8192 in the other direction */
if (packet->payload_packet_len == 1460
&& ((flow->l4.tcp.irc_stage2 == 0 && flow->l4.tcp.irc_direction == 0) || (flow->l4.tcp.irc_stage2 == 3
&& flow->l4.tcp.irc_direction ==
1 + packet->packet_direction))) {
flow->l4.tcp.irc_stage2 = 1;
flow->l4.tcp.irc_direction = 1 + packet->packet_direction;
return 1;
}
if (packet->payload_packet_len == 1460 && flow->l4.tcp.irc_stage2 == 1
&& flow->l4.tcp.irc_direction == 1 + packet->packet_direction) {
flow->l4.tcp.irc_stage2 = 2;
return 1;
}
if (packet->payload_packet_len == 1176 && flow->l4.tcp.irc_stage2 == 2
&& flow->l4.tcp.irc_direction == 1 + packet->packet_direction) {
flow->l4.tcp.irc_stage2 = 3;
flow->l4.tcp.irc_0x1000_full = 1;
return 1;
}
if (packet->payload_packet_len == 4 && (flow->l4.tcp.irc_stage2 == 3 || flow->l4.tcp.irc_0x1000_full == 1)
&& flow->l4.tcp.irc_direction == 2 - packet->packet_direction && (ntohs(get_u_int16_t(packet->payload, 2)) == 0x1000
|| ntohs(get_u_int16_t(packet->payload, 2)) ==
0x2000)) {
NDPI_LOG_INFO(ndpi_struct, "found IRC SSL: ->1460,1460,1176,<-4096||8192");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return 1;
}
/* case 2: len 1448, len 1448, len 1200 several times in one direction, than len = 4, 4096, 8192 in the other direction */
if (packet->payload_packet_len == 1448
&& ((flow->l4.tcp.irc_stage2 == 0 && flow->l4.tcp.irc_direction == 0) || (flow->l4.tcp.irc_stage2 == 6
&& flow->l4.tcp.irc_direction ==
1 + packet->packet_direction))) {
flow->l4.tcp.irc_stage2 = 4;
flow->l4.tcp.irc_direction = 1 + packet->packet_direction;
NDPI_LOG_DBG2(ndpi_struct, "len = 1448 first\n");
return 1;
}
if (packet->payload_packet_len == 1448 && flow->l4.tcp.irc_stage2 == 4
&& flow->l4.tcp.irc_direction == 1 + packet->packet_direction) {
flow->l4.tcp.irc_stage2 = 5;
NDPI_LOG_DBG2(ndpi_struct, "len = 1448 second \n");
return 1;
}
if (packet->payload_packet_len == 1200 && flow->l4.tcp.irc_stage2 == 5
&& flow->l4.tcp.irc_direction == 1 + packet->packet_direction) {
flow->l4.tcp.irc_stage2 = 6;
flow->l4.tcp.irc_0x1000_full = 1;
NDPI_LOG_DBG2(ndpi_struct, "len = 1200 \n");
return 1;
}
if (packet->payload_packet_len == 4 && (flow->l4.tcp.irc_stage2 == 6 || flow->l4.tcp.irc_0x1000_full == 1)
&& flow->l4.tcp.irc_direction == 2 - packet->packet_direction && (ntohs(get_u_int16_t(packet->payload, 2)) == 0x1000
|| ntohs(get_u_int16_t(packet->payload, 2)) ==
0x2000)) {
NDPI_LOG_INFO(ndpi_struct, "found IRC SSL: ->1448,1448,1200,<-4096||8192");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return 1;
}
/* case 3: several packets with len 1380, 1200, 1024, 1448, 1248,
* than one packet in the other direction with the len or two times the len. */
if (packet->payload_packet_len == 1380 && ((flow->l4.tcp.irc_stage2 == 0 && flow->l4.tcp.irc_direction == 0)
|| (flow->l4.tcp.irc_stage2 == 7
&& flow->l4.tcp.irc_direction == 1 + packet->packet_direction))) {
flow->l4.tcp.irc_stage2 = 7;
flow->l4.tcp.irc_direction = 1 + packet->packet_direction;
return 1;
}
if (packet->payload_packet_len == 4 && flow->l4.tcp.irc_stage2 == 7
&& flow->l4.tcp.irc_direction == 2 - packet->packet_direction && (ntohs(get_u_int16_t(packet->payload, 2)) == 1380
|| ntohs(get_u_int16_t(packet->payload, 2)) ==
2760)) {
NDPI_LOG_INFO(ndpi_struct, "found IRC SSL: ->1380,<-1380||2760");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return 1;
}
if (packet->payload_packet_len == 1200 && ((flow->l4.tcp.irc_stage2 == 0 && flow->l4.tcp.irc_direction == 0)
|| (flow->l4.tcp.irc_stage2 == 8
&& flow->l4.tcp.irc_direction == 1 + packet->packet_direction))) {
flow->l4.tcp.irc_stage2 = 8;
flow->l4.tcp.irc_direction = 1 + packet->packet_direction;
return 1;
}
if (packet->payload_packet_len == 4 && flow->l4.tcp.irc_stage2 == 8
&& flow->l4.tcp.irc_direction == 2 - packet->packet_direction && (ntohs(get_u_int16_t(packet->payload, 2)) == 1200
|| ntohs(get_u_int16_t(packet->payload, 2)) ==
2400)) {
NDPI_LOG_INFO(ndpi_struct, "found IRC SSL: ->1200,<-1200||2400");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return 1;
}
if (packet->payload_packet_len == 1024 && ((flow->l4.tcp.irc_stage2 == 0 && flow->l4.tcp.irc_direction == 0)
|| (flow->l4.tcp.irc_stage2 == 9
&& flow->l4.tcp.irc_direction == 1 + packet->packet_direction))) {
flow->l4.tcp.irc_stage2 = 9;
flow->l4.tcp.irc_direction = 1 + packet->packet_direction;
return 1;
}
if (packet->payload_packet_len == 4 && (flow->l4.tcp.irc_stage2 == 9 || flow->l4.tcp.irc_stage2 == 15)
&& flow->l4.tcp.irc_direction == 2 - packet->packet_direction && (ntohs(get_u_int16_t(packet->payload, 2)) == 1024
|| ntohs(get_u_int16_t(packet->payload, 2)) ==
2048)) {
NDPI_LOG_INFO(ndpi_struct, "found IRC SSL: ->1024,<-1024||2048");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return 1;
}
if (packet->payload_packet_len == 1248 && ((flow->l4.tcp.irc_stage2 == 0 && flow->l4.tcp.irc_direction == 0)
|| (flow->l4.tcp.irc_stage2 == 10
&& flow->l4.tcp.irc_direction == 1 + packet->packet_direction))) {
flow->l4.tcp.irc_stage2 = 10;
flow->l4.tcp.irc_direction = 1 + packet->packet_direction;
return 1;
}
if (packet->payload_packet_len == 4 && flow->l4.tcp.irc_stage2 == 10
&& flow->l4.tcp.irc_direction == 2 - packet->packet_direction && (ntohs(get_u_int16_t(packet->payload, 2)) == 1248
|| ntohs(get_u_int16_t(packet->payload, 2)) ==
2496)) {
NDPI_LOG_INFO(ndpi_struct, "found IRC SSL: ->1248,<-1248||2496");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return 1;
}
if (packet->payload_packet_len == 1448
&& (flow->l4.tcp.irc_stage2 == 5 && flow->l4.tcp.irc_direction == 1 + packet->packet_direction)) {
flow->l4.tcp.irc_stage2 = 11;
return 1;
}
if (packet->payload_packet_len == 4
&& (flow->l4.tcp.irc_stage2 == 4 || flow->l4.tcp.irc_stage2 == 5 || flow->l4.tcp.irc_stage2 == 11
|| flow->l4.tcp.irc_stage2 == 13)
&& flow->l4.tcp.irc_direction == 2 - packet->packet_direction && (ntohs(get_u_int16_t(packet->payload, 2)) == 1448
|| ntohs(get_u_int16_t(packet->payload, 2)) ==
2896)) {
NDPI_LOG_INFO(ndpi_struct, "found IRC SSL: ->1448,<-1448||2896");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return 1;
}
/* case 4 : five packets with len = 1448, one with len 952, than one packet from other direction len = 8192 */
if (packet->payload_packet_len == 1448
&& (flow->l4.tcp.irc_stage2 == 11 && flow->l4.tcp.irc_direction == 1 + packet->packet_direction)) {
flow->l4.tcp.irc_stage2 = 12;
return 1;
}
if (packet->payload_packet_len == 1448
&& (flow->l4.tcp.irc_stage2 == 12 && flow->l4.tcp.irc_direction == 1 + packet->packet_direction)) {
flow->l4.tcp.irc_stage2 = 13;
return 1;
}
if (packet->payload_packet_len == 952
&& (flow->l4.tcp.irc_stage2 == 13 && flow->l4.tcp.irc_direction == 1 + packet->packet_direction)) {
flow->l4.tcp.irc_stage2 = 14;
return 1;
}
if (packet->payload_packet_len == 4
&& flow->l4.tcp.irc_stage2 == 14
&& flow->l4.tcp.irc_direction == 2 - packet->packet_direction && ntohs(get_u_int16_t(packet->payload, 2)) == 8192) {
NDPI_LOG_INFO(ndpi_struct, "found IRC SSL: ->1448,1448,1448,1448,1448,952,<-8192");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return 1;
}
/* case 5: len 1024, len 1448, len 1448, len 1200, len 1448, len 600 */
if (packet->payload_packet_len == 1448
&& (flow->l4.tcp.irc_stage2 == 9 && flow->l4.tcp.irc_direction == 1 + packet->packet_direction)) {
flow->l4.tcp.irc_stage2 = 15;
return 1;
}
if (packet->payload_packet_len == 1448
&& (flow->l4.tcp.irc_stage2 == 15 && flow->l4.tcp.irc_direction == 1 + packet->packet_direction)) {
flow->l4.tcp.irc_stage2 = 16;
return 1;
}
if (packet->payload_packet_len == 1200
&& (flow->l4.tcp.irc_stage2 == 16 && flow->l4.tcp.irc_direction == 1 + packet->packet_direction)) {
flow->l4.tcp.irc_stage2 = 17;
return 1;
}
if (packet->payload_packet_len == 1448
&& (flow->l4.tcp.irc_stage2 == 17 && flow->l4.tcp.irc_direction == 1 + packet->packet_direction)) {
flow->l4.tcp.irc_stage2 = 18;
return 1;
}
if (packet->payload_packet_len == 600
&& (flow->l4.tcp.irc_stage2 == 18 && flow->l4.tcp.irc_direction == 1 + packet->packet_direction)) {
flow->l4.tcp.irc_stage2 = 19;
return 1;
}
if (packet->payload_packet_len == 4
&& flow->l4.tcp.irc_stage2 == 19
&& flow->l4.tcp.irc_direction == 2 - packet->packet_direction && ntohs(get_u_int16_t(packet->payload, 2)) == 7168) {
NDPI_LOG_INFO(ndpi_struct, "found IRC SSL: ->1024,1448,1448,1200,1448,600,<-7168");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return 1;
}
/* -> 1024, 1380, -> 2404 */
if (packet->payload_packet_len == 1380
&& (flow->l4.tcp.irc_stage2 == 9 && flow->l4.tcp.irc_direction == 1 + packet->packet_direction)) {
flow->l4.tcp.irc_stage2 = 20;
return 1;
}
if (packet->payload_packet_len == 4
&& flow->l4.tcp.irc_stage2 == 20
&& flow->l4.tcp.irc_direction == 2 - packet->packet_direction && ntohs(get_u_int16_t(packet->payload, 2)) == 2404) {
NDPI_LOG_INFO(ndpi_struct, "found IRC SSL: ->1024,1380 <-2404");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return 1;
}
return 0;
}
void ndpi_search_irc_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;
int less;
u_int16_t c = 0;
u_int16_t c1 = 0;
u_int16_t port = 0;
u_int16_t sport = 0;
u_int16_t dport = 0;
u_int16_t counter = 0;
u_int16_t i = 0;
u_int16_t j = 0;
u_int16_t k = 0;
u_int16_t h;
u_int16_t http_content_ptr_len = 0;
u_int8_t space = 0;
NDPI_LOG_DBG(ndpi_struct, "search irc\n");
if (flow->detected_protocol_stack[0] != NDPI_PROTOCOL_IRC && flow->packet_counter > 70) {
NDPI_LOG_DBG(ndpi_struct, "exclude irc, packet_counter > 70\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_IRC);
return;
}
if (flow->detected_protocol_stack[0] != NDPI_PROTOCOL_IRC && flow->packet_counter > 30 &&
flow->l4.tcp.irc_stage2 == 0) {
NDPI_LOG_DBG(ndpi_struct, "exclude irc, packet_counter > 30\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_IRC);
return;
}
if (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_IRC) {
if (src != NULL && ((u_int32_t)
(packet->tick_timestamp - src->irc_ts) < ndpi_struct->irc_timeout)) {
NDPI_LOG_DBG2(ndpi_struct, "irc : save src connection packet detected\n");
src->irc_ts = packet->tick_timestamp;
} else if (dst != NULL && ((u_int32_t)
(packet->tick_timestamp - dst->irc_ts) < ndpi_struct->irc_timeout)) {
NDPI_LOG_DBG2(ndpi_struct, "irc : save dst connection packet detected\n");
dst->irc_ts = packet->tick_timestamp;
}
}
if (((dst != NULL && NDPI_COMPARE_PROTOCOL_TO_BITMASK(dst->detected_protocol_bitmask, NDPI_PROTOCOL_IRC)
&& ((u_int32_t)
(packet->tick_timestamp - dst->irc_ts)) <
ndpi_struct->irc_timeout)) || (src != NULL
&&
NDPI_COMPARE_PROTOCOL_TO_BITMASK
(src->detected_protocol_bitmask, NDPI_PROTOCOL_IRC)
&& ((u_int32_t)
(packet->tick_timestamp - src->irc_ts)) < ndpi_struct->irc_timeout)) {
if (packet->tcp != NULL) {
sport = packet->tcp->source;
dport = packet->tcp->dest;
}
if (dst != NULL) {
for (counter = 0; counter < dst->irc_number_of_port; counter++) {
if (dst->irc_port[counter] == sport || dst->irc_port[counter] == dport) {
dst->last_time_port_used[counter] = packet->tick_timestamp;
NDPI_LOG_INFO(ndpi_struct, "found IRC: dest port matched with the DCC port");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return;
}
}
}
if (src != NULL) {
for (counter = 0; counter < src->irc_number_of_port; counter++) {
if (src->irc_port[counter] == sport || src->irc_port[counter] == dport) {
src->last_time_port_used[counter] = packet->tick_timestamp;
NDPI_LOG_INFO(ndpi_struct, "found IRC: Source port matched with the DCC port");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return;
}
}
}
}
if (flow->detected_protocol_stack[0] != NDPI_PROTOCOL_IRC
&& flow->packet_counter == 2 && (packet->payload_packet_len > 400 && packet->payload_packet_len < 1381)) {
for (c1 = 50; c1 < packet->payload_packet_len - 23; c1++) {
if (packet->payload[c1] == 'i' || packet->payload[c1] == 'd') {
if ((memcmp(&packet->payload[c1], "irc.hackthissite.org0", 21)
== 0)
|| (memcmp(&packet->payload[c1], "irc.gamepad.ca1", 15) == 0)
|| (memcmp(&packet->payload[c1], "dungeon.axenet.org0", 19)
== 0)
|| (memcmp(&packet->payload[c1], "dazed.nuggethaus.net", 20)
== 0)
|| (memcmp(&packet->payload[c1], "irc.indymedia.org", 17)
== 0)
|| (memcmp(&packet->payload[c1], "irc.cccp-project.net", 20)
== 0)
|| (memcmp(&packet->payload[c1], "dirc.followell.net0", 19)
== 0)
|| (memcmp(&packet->payload[c1], "irc.discostars.de1", 18)
== 0)
|| (memcmp(&packet->payload[c1], "irc.rizon.net", 13) == 0)) {
NDPI_LOG_INFO(ndpi_struct,
"found IRC SSL: - irc.hackthissite.org0 | irc.gamepad.ca1 | dungeon.axenet.org0 "
"| dazed.nuggethaus.net | irc.indymedia.org | irc.discostars.de1 ");
ndpi_int_irc_add_connection(ndpi_struct, flow);
break;
}
}
}
}
if (flow->detected_protocol_stack[0] != NDPI_PROTOCOL_IRC &&
ndpi_search_irc_ssl_detect_ninety_percent_but_very_fast(ndpi_struct, flow) != 0) {
return;
}
if (flow->detected_protocol_stack[0] != NDPI_PROTOCOL_IRC && flow->packet_counter < 20
&& packet->payload_packet_len >= 8) {
if (get_u_int8_t(packet->payload, packet->payload_packet_len - 1) == 0x0a
|| (ntohs(get_u_int16_t(packet->payload, packet->payload_packet_len - 2)) == 0x0a00)) {
if (memcmp(packet->payload, ":", 1) == 0) {
if (packet->payload[packet->payload_packet_len - 2] != 0x0d
&& packet->payload[packet->payload_packet_len - 1] == 0x0a) {
ndpi_parse_packet_line_info_any(ndpi_struct, flow);
} else if (packet->payload[packet->payload_packet_len - 2] == 0x0d) {
ndpi_parse_packet_line_info(ndpi_struct, flow);
} else {
flow->l4.tcp.irc_3a_counter++;
}
for (i = 0; i < packet->parsed_lines; i++) {
if (packet->line[i].ptr[0] == ':') {
flow->l4.tcp.irc_3a_counter++;
if (flow->l4.tcp.irc_3a_counter == 7) { /* ':' == 0x3a */
NDPI_LOG_INFO(ndpi_struct, "found irc. 0x3a. seven times.");
ndpi_int_irc_add_connection(ndpi_struct, flow);
goto detected_irc;
}
}
}
if (flow->l4.tcp.irc_3a_counter == 7) { /* ':' == 0x3a */
NDPI_LOG_INFO(ndpi_struct, "found irc. 0x3a. seven times.");
ndpi_int_irc_add_connection(ndpi_struct, flow);
goto detected_irc;
}
}
if ((memcmp(packet->payload, "USER ", 5) == 0)
|| (memcmp(packet->payload, "NICK ", 5) == 0)
|| (memcmp(packet->payload, "PASS ", 5) == 0)
|| (memcmp(packet->payload, ":", 1) == 0 && ndpi_check_for_NOTICE_or_PRIVMSG(ndpi_struct, flow) != 0)
|| (memcmp(packet->payload, "PONG ", 5) == 0)
|| (memcmp(packet->payload, "PING ", 5) == 0)
|| (memcmp(packet->payload, "JOIN ", 5) == 0)
|| (memcmp(packet->payload, "NOTICE ", 7) == 0)
|| (memcmp(packet->payload, "PRIVMSG ", 8) == 0)
|| (memcmp(packet->payload, "VERSION ", 8) == 0)) {
NDPI_LOG_DBG2(ndpi_struct,
"USER, NICK, PASS, NOTICE, PRIVMSG one time");
if (flow->l4.tcp.irc_stage == 2) {
NDPI_LOG_INFO(ndpi_struct, "found irc");
ndpi_int_irc_add_connection(ndpi_struct, flow);
flow->l4.tcp.irc_stage = 3;
}
if (flow->l4.tcp.irc_stage == 1) {
NDPI_LOG_DBG2(ndpi_struct, "second time, stage=2");
flow->l4.tcp.irc_stage = 2;
}
if (flow->l4.tcp.irc_stage == 0) {
NDPI_LOG_DBG2(ndpi_struct, "first time, stage=1");
flow->l4.tcp.irc_stage = 1;
}
/* irc packets can have either windows line breaks (0d0a) or unix line breaks (0a) */
if (packet->payload[packet->payload_packet_len - 2] == 0x0d
&& packet->payload[packet->payload_packet_len - 1] == 0x0a) {
ndpi_parse_packet_line_info(ndpi_struct, flow);
if (packet->parsed_lines > 1) {
NDPI_LOG_DBG2(ndpi_struct, "packet contains more than one line");
for (c = 1; c < packet->parsed_lines; c++) {
if (packet->line[c].len > 4 && (memcmp(packet->line[c].ptr, "NICK ", 5) == 0
|| memcmp(packet->line[c].ptr, "USER ", 5) == 0)) {
NDPI_LOG_INFO(ndpi_struct, "found IRC: two icq signal words in the same packet");
ndpi_int_irc_add_connection(ndpi_struct, flow);
flow->l4.tcp.irc_stage = 3;
return;
}
}
}
} else if (packet->payload[packet->payload_packet_len - 1] == 0x0a) {
ndpi_parse_packet_line_info_any(ndpi_struct, flow);
if (packet->parsed_lines > 1) {
NDPI_LOG_DBG2(ndpi_struct, "packet contains more than one line");
for (c = 1; c < packet->parsed_lines; c++) {
if (packet->line[c].len > 4 && (memcmp(packet->line[c].ptr, "NICK ", 5) == 0
|| memcmp(packet->line[c].ptr, "USER ",
5) == 0)) {
NDPI_LOG_INFO(ndpi_struct, "found IRC: two icq signal words in the same packet");
ndpi_int_irc_add_connection(ndpi_struct, flow);
flow->l4.tcp.irc_stage = 3;
return;
}
}
}
}
}
}
}
/**
* Trying to primarily detect the HTTP Web based IRC chat patterns based on the HTTP headers
* during the User login time.When the HTTP data gets posted using the POST method ,patterns
* will be searched in the HTTP content.
*/
if ((flow->detected_protocol_stack[0] != NDPI_PROTOCOL_IRC) && (flow->l4.tcp.irc_stage == 0)
&& (packet->payload_packet_len > 5)) {
//HTTP POST Method being employed
if (memcmp(packet->payload, "POST ", 5) == 0) {
ndpi_parse_packet_line_info(ndpi_struct, flow);
if (packet->parsed_lines) {
u_int16_t http_header_len = (u_int16_t)((packet->line[packet->parsed_lines - 1].ptr - packet->payload) + 2);
if (packet->payload_packet_len > http_header_len) {
http_content_ptr_len = packet->payload_packet_len - http_header_len;
}
if ((ndpi_check_for_IRC_traces(packet->line[0].ptr, packet->line[0].len))
|| ((packet->http_url_name.ptr)
&& (ndpi_check_for_IRC_traces(packet->http_url_name.ptr, packet->http_url_name.len)))
|| ((packet->referer_line.ptr)
&& (ndpi_check_for_IRC_traces(packet->referer_line.ptr, packet->referer_line.len)))) {
NDPI_LOG_DBG2(ndpi_struct,
"IRC detected from the Http URL/ Referer header ");
flow->l4.tcp.irc_stage = 1;
// HTTP POST Request body is not in the same packet.
if (!http_content_ptr_len) {
return;
}
}
}
}
}
if ((flow->detected_protocol_stack[0] != NDPI_PROTOCOL_IRC) && (flow->l4.tcp.irc_stage == 1)) {
if ((((packet->payload_packet_len - http_content_ptr_len) > 10)
&& (memcmp(packet->payload + http_content_ptr_len, "interface=", 10) == 0)
&& (ndpi_check_for_Nickname(ndpi_struct, flow) != 0))
|| (((packet->payload_packet_len - http_content_ptr_len) > 5)
&& (memcmp(packet->payload + http_content_ptr_len, "item=", 5) == 0)
&& (ndpi_check_for_cmd(ndpi_struct, flow) != 0))) {
NDPI_LOG_INFO(ndpi_struct, "found IRC: Nickname, cmd, one time");
ndpi_int_irc_add_connection(ndpi_struct, flow);
return;
}
}
detected_irc:
NDPI_LOG_DBG2(ndpi_struct, "detected_irc:");
if (flow->detected_protocol_stack[0] == NDPI_PROTOCOL_IRC) {
/* maybe this can be deleted at the end */
if (packet->payload[packet->payload_packet_len - 2] != 0x0d
&& packet->payload[packet->payload_packet_len - 1] == 0x0a) {
NDPI_LOG_DBG2(ndpi_struct, "ndpi_parse_packet_line_info_any(ndpi_struct, flow);");
ndpi_parse_packet_line_info_any(ndpi_struct, flow);
} else if (packet->payload[packet->payload_packet_len - 2] == 0x0d) {
ndpi_parse_packet_line_info(ndpi_struct, flow);
} else {
return;
}
for (i = 0; i < packet->parsed_lines; i++) {
if (packet->line[i].len > 6 && memcmp(packet->line[i].ptr, "NOTICE ", 7) == 0) {
NDPI_LOG_DBG2(ndpi_struct, "NOTICE");
for (j = 7; j < packet->line[i].len - 8; j++) {
if (packet->line[i].ptr[j] == ':') {
if (memcmp(&packet->line[i].ptr[j + 1], "DCC SEND ", 9) == 0
|| memcmp(&packet->line[i].ptr[j + 1], "DCC CHAT ", 9) == 0) {
NDPI_LOG_INFO(ndpi_struct,
"found NOTICE and DCC CHAT or DCC SEND.");
}
}
}
}
if (packet->payload_packet_len > 0 && packet->payload[0] == 0x3a /* 0x3a = ':' */ ) {
NDPI_LOG_DBG2(ndpi_struct, "3a");
for (j = 1; j < packet->line[i].len - 9; j++) {
if (packet->line[i].ptr[j] == ' ') {
j++;
if (packet->line[i].ptr[j] == 'P') {
NDPI_LOG_DBG2(ndpi_struct, "P");
j++;
if (memcmp(&packet->line[i].ptr[j], "RIVMSG ", 7) == 0)
NDPI_LOG_DBG2(ndpi_struct, "RIVMSG");
h = j + 7;
goto read_privmsg;
}
}
}
}
if (packet->line[i].len > 7 && (memcmp(packet->line[i].ptr, "PRIVMSG ", 8) == 0)) {
NDPI_LOG_DBG2(ndpi_struct, "PRIVMSG ");
h = 7;
read_privmsg:
for (j = h; j < packet->line[i].len - 9; j++) {
if (packet->line[i].ptr[j] == ':') {
if (memcmp(&packet->line[i].ptr[j + 1], "xdcc ", 5) == 0) {
NDPI_LOG_DBG2(ndpi_struct, "xdcc should match.");
}
j += 2;
if (memcmp(&packet->line[i].ptr[j], "DCC ", 4) == 0) {
j += 4;
NDPI_LOG_DBG2(ndpi_struct, "found DCC.");
if (memcmp(&packet->line[i].ptr[j], "SEND ", 5) == 0
|| (memcmp(&packet->line[i].ptr[j], "CHAT", 4) == 0)
|| (memcmp(&packet->line[i].ptr[j], "chat", 4) == 0)
|| (memcmp(&packet->line[i].ptr[j], "sslchat", 7) == 0)
|| (memcmp(&packet->line[i].ptr[j], "TSEND", 5) == 0)) {
NDPI_LOG_DBG2(ndpi_struct, "found CHAT,chat,sslchat,TSEND.");
j += 4;
while (packet->line[i].len > j &&
((packet->line[i].ptr[j] >= 'a' && packet->line[i].ptr[j] <= 'z')
|| (packet->line[i].ptr[j] >= 'A' && packet->line[i].ptr[j] <= 'Z')
|| (packet->line[i].ptr[j] >= '0' && packet->line[i].ptr[j] <= '9')
|| (packet->line[i].ptr[j] >= ' ')
|| (packet->line[i].ptr[j] >= '.')
|| (packet->line[i].ptr[j] >= '-'))) {
if (packet->line[i].ptr[j] == ' ') {
space++;
NDPI_LOG_DBG2(ndpi_struct, "space %u.", space);
}
if (space == 3) {
j++;
NDPI_LOG_DBG2(ndpi_struct, "read port.");
if (src != NULL) {
k = j;
port =
ntohs_ndpi_bytestream_to_number
(&packet->line[i].ptr[j], packet->payload_packet_len - j, &j);
NDPI_LOG_DBG2(ndpi_struct, "port %u.",
port);
j = k;
// hier jetzt überlegen, wie die ports abgespeichert werden sollen
if (src->irc_number_of_port < NDPI_PROTOCOL_IRC_MAXPORT)
NDPI_LOG_DBG2(ndpi_struct, "src->irc_number_of_port < NDPI_PROTOCOL_IRC_MAXPORT.");
if (src->irc_number_of_port < NDPI_PROTOCOL_IRC_MAXPORT && port != 0) {
if (!ndpi_is_duplicate(src, port)) {
src->irc_port[src->irc_number_of_port]
= port;
src->irc_number_of_port++;
NDPI_LOG_DBG2(ndpi_struct, "found port=%d jjeeeeeeeeeeeeeeeeeeeeeeeee",
ntohs(get_u_int16_t(src->irc_port, 0)));
}
src->irc_ts = packet->tick_timestamp;
} else if (port != 0 && src->irc_number_of_port == NDPI_PROTOCOL_IRC_MAXPORT) {
if (!ndpi_is_duplicate(src, port)) {
less = 0;
NDPI_IRC_FIND_LESS(src->last_time_port_used, less);
src->irc_port[less] = port;
NDPI_LOG_DBG2(ndpi_struct, "found port=%d", ntohs(get_u_int16_t(src->irc_port, 0)));
}
src->irc_ts = packet->tick_timestamp;
}
if (dst == NULL) {
break;
}
}
if (dst != NULL) {
port = ntohs_ndpi_bytestream_to_number
(&packet->line[i].ptr[j], packet->payload_packet_len - j, &j);
NDPI_LOG_DBG2(ndpi_struct, "port %u.", port);
// hier das gleiche wie oben.
/* hier werden NDPI_PROTOCOL_IRC_MAXPORT ports pro irc flows mitgespeichert. könnte man denn nicht ein-
* fach an die dst oder src einen flag setzten, dass dieser port für eine bestimmte
* zeit ein irc-port bleibt?
*/
if (dst->irc_number_of_port < NDPI_PROTOCOL_IRC_MAXPORT && port != 0) {
if (!ndpi_is_duplicate(dst, port)) {
dst->irc_port[dst->irc_number_of_port]
= port;
dst->irc_number_of_port++;
NDPI_LOG_DBG2(ndpi_struct, "found port=%d", ntohs(get_u_int16_t(dst->irc_port, 0)));
NDPI_LOG_DBG2(ndpi_struct, "juuuuuuuuuuuuuuuu");
}
dst->irc_ts = packet->tick_timestamp;
} else if (port != 0 && dst->irc_number_of_port == NDPI_PROTOCOL_IRC_MAXPORT) {
if (!ndpi_is_duplicate(dst, port)) {
less = 0;
NDPI_IRC_FIND_LESS(dst->last_time_port_used, less);
dst->irc_port[less] = port;
NDPI_LOG_DBG2(ndpi_struct, "found port=%d", ntohs(get_u_int16_t(dst->irc_port, 0)));
}
dst->irc_ts = packet->tick_timestamp;
}
break;
}
}
j++;
}
}
}
}
}
}
}
}
}
void init_irc_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("IRC", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_IRC,
ndpi_search_irc_tcp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}