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masking.c

/*
 * RageIRCd: an advanced Internet Relay Chat daemon (ircd).
 * (C) 2000-2005 the RageIRCd Development Team, all rights reserved.
 *
 * This software is free, licensed under the General Public License.
 * Please refer to doc/LICENSE and doc/README for further details.
 *
 * $Id: masking.c,v 1.52.2.2 2005/07/09 00:39:20 amcwilliam Exp $
 */

#include "struct.h"
#include "common.h"
#include "sys.h"
#include "numeric.h"
#include "msg.h"
#include "channel.h"
#include "h.h"
#include "memory.h"
#include "xmode.h"
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>

static 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
};

static long my_crc32(char *string)
{
      long crc32val = 0;
      int i;

      for (i = 0; i < strlen(string); i++) {
            crc32val = crc32_tab[(crc32val ^ string[i]) & 0xff] ^ (crc32val >> 8);
      }

      return crc32val;
}

void init_masking_keys()
{
      static char tmp[256];
      
      ircsprintf(tmp, "%ld.%ld.%ld", MaskingConfig.mask_key1, MaskingConfig.mask_key2,
            MaskingConfig.mask_key3);
      ircsprintf(Internal.masking_keys, "%X", my_crc32(tmp));
}

char *maskme(aClient *cptr)
{
      static char maskedhost[HOSTLEN + 1], *s;
      long crc[3];

      ASSERT(IsClient(cptr));
      ASSERT(cptr != NULL);
      ASSERT(cptr->user != NULL);

      if (!HasMode(cptr, UMODE_MASKED)) {
            return cptr->host;
      }
      
      if (HasMode(cptr, UMODE_NETADMIN)) {
            if (!BadPtr(MaskingConfig.netadmin_mask)) {
                  return MaskingConfig.netadmin_mask;
            }
      }
      else if (HasMode(cptr, UMODE_ADMIN)) {
            if (!BadPtr(MaskingConfig.admin_mask)) {
                  return MaskingConfig.admin_mask;
            }
      }
      else if (HasMode(cptr, UMODE_OPER)) {
            if (!BadPtr(MaskingConfig.oper_mask)) {
                  return MaskingConfig.oper_mask;
            }
      }

      for (s = cptr->host; *s != '\0'; s++) {
            if ((*s != '.') && !IsDigit(*s)) {
                  break;
            }
      }

      if (*s == '\0') {
            char hostbuf[HOSTLEN + 1], tmpbuf[HOSTLEN + 1], ipbuf[4][4];
            char *p, *p2;
            int i = 0;

            strncpyzt(hostbuf, cptr->host, HOSTLEN + 1);

            for (p = strtoken(&p2, hostbuf, "."); p != NULL; p = strtoken(&p2, NULL, ".")) {
                  strncpyzt(ipbuf[i], p, 4);
                  i++;
            }

            ircsprintf(tmpbuf, "%s.%s", ipbuf[0], ipbuf[1]);
            crc[0] = ((my_crc32(tmpbuf) + MaskingConfig.mask_key1) ^ MaskingConfig.mask_key2) + MaskingConfig.mask_key3;
            crc[0] &= 0x7FFFFFFF;

            ircsprintf(tmpbuf, "%s.%s.%s", ipbuf[0], ipbuf[1], ipbuf[2]);
            crc[1] = ((MaskingConfig.mask_key2 ^ my_crc32(tmpbuf)) + MaskingConfig.mask_key3) ^ MaskingConfig.mask_key1;
            crc[1] &= 0xFFFFFFFF;

            crc[2] = ((my_crc32(cptr->host) + MaskingConfig.mask_key3) ^ MaskingConfig.mask_key1) + MaskingConfig.mask_key2;
            crc[2] &= 0x3FFFFFFF;

            ircsprintf(maskedhost, "%s-%X.%X.%X.IP", MaskingConfig.user_mask_prefix, crc[2], crc[1], crc[0]);
            return maskedhost;
      }

      for (s = cptr->host; *s != '\0'; s++) {
            if (*s == '.' && IsAlpha(*(s + 1))) {
                  break;
            }
      }

      crc[0] = ((my_crc32(cptr->host) ^ MaskingConfig.mask_key2) + MaskingConfig.mask_key1) ^ MaskingConfig.mask_key3;
      crc[0] &= 0x3FFFFFFF;

      if (*s == '.') {
            ircsnprintf(maskedhost, HOSTLEN, "%s-%X.%s", MaskingConfig.user_mask_prefix, crc[0], (s + 1));
      }
      else {
            ircsprintf(maskedhost, "%s-%X", MaskingConfig.user_mask_prefix, crc[0]);
      }

      return maskedhost;
}

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