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/*
* irc.c
*
* Copyright (C) 2009-11 - ipoque GmbH
* Copyright (C) 2011-22 - 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"
#include "ndpi_private.h"
static void ndpi_int_irc_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow, ndpi_confidence_t confidence)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_IRC, NDPI_PROTOCOL_UNKNOWN, confidence);
}
static u_int8_t ndpi_check_for_NOTICE_or_PRIVMSG(struct ndpi_detection_module_struct *ndpi_struct)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
if(ndpi_memmem(packet->payload, packet->payload_packet_len, "NOTICE", 6))
return 1;
if(ndpi_memmem(packet->payload, packet->payload_packet_len, "PRIVMSG", 7))
return 1;
return 0;
}
static u_int8_t ndpi_check_for_Nickname(struct ndpi_detection_module_struct *ndpi_struct)
{
struct ndpi_packet_struct *packet = &ndpi_struct->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_packet_struct *packet = &ndpi_struct->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 void ndpi_search_irc_tcp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
u_int16_t c = 0;
u_int16_t i = 0;
u_int16_t http_content_ptr_len = 0;
NDPI_LOG_DBG(ndpi_struct, "search irc\n");
if((flow->detected_protocol_stack[0] != NDPI_PROTOCOL_IRC && (flow->packet_counter > 10))
|| (flow->packet_counter >= 10)) {
NDPI_LOG_DBG(ndpi_struct, "exclude irc, packet_counter too high0\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 < 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);
} 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++;
packet->parsed_lines = 0;
}
for (i = 0; i < packet->parsed_lines; i++) {
if ((packet->line[i].len > 0) && 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, NDPI_CONFIDENCE_DPI);
return;
}
}
}
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, NDPI_CONFIDENCE_DPI);
return;
}
}
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) != 0)
|| (memcmp(packet->payload, "PONG ", 5) == 0)
|| (memcmp(packet->payload, "PING ", 5) == 0)
|| (memcmp(packet->payload, "JOIN ", 5) == 0)
|| (memcmp(packet->payload, "MODE ", 5) == 0)
|| (memcmp(packet->payload, "NOTICE ", 7) == 0)
|| (memcmp(packet->payload, "PRIVMSG ", 8) == 0)
|| (memcmp(packet->payload, "VERSION ", 8) == 0)) {
char *user = ndpi_strnstr((char*)packet->payload, "USER ", packet->payload_packet_len);
if(user) {
char buf[32], msg[64], *sp;
snprintf(buf, sizeof(buf), "%.*s", (int)(packet->payload_packet_len - (user + 5 - (char *)packet->payload)), user + 5);
if((sp = strchr(buf, ' ')) != NULL)
sp[0] = '\0';
snprintf(msg, sizeof(msg), "Found IRC username (%s)", buf);
ndpi_set_risk(ndpi_struct, flow, NDPI_CLEAR_TEXT_CREDENTIALS, msg);
}
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, NDPI_CONFIDENCE_DPI);
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, NDPI_CONFIDENCE_DPI);
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);
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, NDPI_CONFIDENCE_DPI);
flow->l4.tcp.irc_stage = 3;
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) != 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) != 0))) {
NDPI_LOG_INFO(ndpi_struct, "found IRC: Nickname, cmd, one time");
ndpi_int_irc_add_connection(ndpi_struct, flow, NDPI_CONFIDENCE_DPI);
return;
}
}
}
void init_irc_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("IRC", ndpi_struct, *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;
}
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