/*
* NeoIRCd: NeoStats Group. Based on Hybird7
* cloak.c: Provides Hostname Cloaking
*
* Copyright (C) 2000-2002 Edward Brocklesby, Hybrid Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* $Id: cloak.c,v 1.8 2002/10/23 03:53:22 fishwaldo Exp $
*/
/*
**
** Originally rewritten from AustNet's VirtualWorld Code.
** Virtual World written by Roger 'RogerY' Yerramsetti <rogery@austnet.org>
**
** Rewritten using the crc32 implementation by //ylo based on the original
** implementation by Gary S. Brown
**
** hiddenhost implementation based on the code from UnrealIRCd by
** RaYmAn, NiQuiL, narf, Griever (great thinking) eternal, bball, JK.@ roxnet.org
**
** Additional ideas and code by ShadowMaster, [-Th3Dud3-] (RageIRCd) and Solaris @ Demonkarma.net
**
*/
#include "stdinc.h"
#include "whowas.h"
#include "client.h"
#include "common.h"
#include "hash.h"
#include "irc_string.h"
#include "ircd.h"
#include "ircd_defs.h"
#include "numeric.h"
#include "s_serv.h"
#include "s_user.h"
#include "send.h"
#include "s_conf.h"
#include "memory.h"
#include "s_log.h"
#define KEY 23857
#define KEY2 38447
#define KEY3 64709
int str2arr (char **, char *, char *);
unsigned long crc32 (const unsigned char *s, unsigned int len);
/* The implementation here was originally done by Gary S. Brown. I have
borrowed the tables directly, and made some minor changes to the
crc32-function (including changing the interface). //ylo */
/* ============================================================= */
/* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or */
/* code or tables extracted from it, as desired without restriction. */
/* */
/* First, the polynomial itself and its table of feedback terms. The */
/* polynomial is */
/* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 */
/* */
/* Note that we take it "backwards" and put the highest-order term in */
/* the lowest-order bit. The X^32 term is "implied"; the LSB is the */
/* X^31 term, etc. The X^0 term (usually shown as "+1") results in */
/* the MSB being 1. */
/* */
/* Note that the usual hardware shift register implementation, which */
/* is what we're using (we're merely optimizing it by doing eight-bit */
/* chunks at a time) shifts bits into the lowest-order term. In our */
/* implementation, that means shifting towards the right. Why do we */
/* do it this way? Because the calculated CRC must be transmitted in */
/* order from highest-order term to lowest-order term. UARTs transmit */
/* characters in order from LSB to MSB. By storing the CRC this way, */
/* we hand it to the UART in the order low-byte to high-byte; the UART */
/* sends each low-bit to hight-bit; and the result is transmission bit */
/* by bit from highest- to lowest-order term without requiring any bit */
/* shuffling on our part. Reception works similarly. */
/* */
/* The feedback terms table consists of 256, 32-bit entries. Notes: */
/* */
/* The table can be generated at runtime if desired; code to do so */
/* is shown later. It might not be obvious, but the feedback */
/* terms simply represent the results of eight shift/xor opera- */
/* tions for all combinations of data and CRC register values. */
/* */
/* The values must be right-shifted by eight bits by the "updcrc" */
/* logic; the shift must be unsigned (bring in zeroes). On some */
/* hardware you could probably optimize the shift in assembler by */
/* using byte-swap instructions. */
/* polynomial $edb88320 */
/* */
/* -------------------------------------------------------------------- */
static unsigned long crc32_tab[] = {
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
0x2d02ef8dL
};
/* Return a 32-bit CRC of the contents of the buffer. */
unsigned long
crc32 (const unsigned char *s, unsigned int len)
{
unsigned int i;
unsigned long crc32val;
crc32val = 0;
for (i = 0; i < len; i++)
{
crc32val = crc32_tab[(crc32val ^ s[i]) & 0xff] ^ (crc32val >> 8);
}
return crc32val;
}
int
str2arr (char **pparv, char *string, char *delim)
{
char *tok;
int pparc = 0;
tok = (char *) strtok (string, delim);
while (tok != NULL)
{
pparv[pparc++] = tok;
tok = (char *) strtok (NULL, delim);
}
return pparc;
}
/* Regular user host */
void
make_virthost (char *curr, char *host, char *new)
{
static char mask[HOSTLEN + 1];
char *parv[HOSTLEN + 1], *parv2[HOSTLEN + 1], s[HOSTLEN + 1],
s2[HOSTLEN + 2];
int parc = 0, parc2 = 0, len = 0;
unsigned long hash[8];
/* Paranoia. curr & host are pointers */
strncpy (s2, curr, HOSTLEN);
strncpy (s, host, HOSTLEN);
parc = str2arr (parv, s, ".");
parc2 = str2arr (parv2, s2, ".");
/* crc32 and hashing using our 3 keys */
hash[0] = ((crc32 (parv[3], strlen (parv[3])) + KEY2) ^ KEY) ^ KEY3;
hash[1] = ((crc32 (parv[2], strlen (parv[2])) + KEY2) ^ KEY) ^ KEY3;
/* Why make life easy on crackers? Bitshifting */
hash[0] <<= 2;
hash[0] >>= 2;
hash[1] <<= 2;
hash[1] >>= 2;
/* Check if host could be IPv4 */
if (parc2 == 4 || parc2 < 2)
{
len = strlen (parv2[3]);
/* Check if its an IPv4 for sure */
if (strchr ("0123456789", parv2[3][len - 1]) || parc2 < 2)
{
hash[2] = ((crc32 (parv[1], strlen (parv[1])) + KEY2) ^ KEY) ^ KEY3;
hash[3] = ((crc32 (parv[0], strlen (parv[0])) + KEY2) ^ KEY) ^ KEY3;
hash[2] <<= 2;
hash[2] >>= 2;
hash[3] <<= 2;
hash[3] >>= 2;
ircsprintf (mask, "%lx.%lx.%lx.%lxX",
hash[0], hash[1], hash[2], hash[3]);
}
else
{
ircsprintf (mask, "%lx.%lx.%s.%s.%s",
hash[0], hash[1], parv2[parc2 - 3], parv2[parc2 - 2],
parv2[parc2 - 1]);
}
}
else
{
if (parc2 >= 4) /* There are isp's like *.isp.co.uk etc out there */
{
ircsprintf (mask, "%lx.%lx.%s.%s.%s",
hash[0], hash[1], parv2[parc2 - 3], parv2[parc2 - 2],
parv2[parc2 - 1]);
}
else
{
ircsprintf (mask, "%lx.%lx.%s.%s",
hash[0], hash[1], parv2[parc2 - 2], parv2[parc2 - 1]);
}
}
strncpy (new, mask, HOSTLEN);
return;
}