]>
jfr.im git - irc/evilnet/x3.git/blob - src/hosthiding.c
1 /* hosthiding.c - Host hiding
2 * Copyright 2000-2006 X3 Development Team
4 * This file is part of x3.
6 * x3 is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with srvx; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 #include "hosthiding.h"
26 /* The implementation here was originally done by Gary S. Brown. I have
27 borrowed the tables directly, and made some minor changes to the
28 crc32-function (including changing the interface). //ylo */
30 /* ====================================================================== */
31 /* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or */
32 /* code or tables extracted from it, as desired without restriction. */
34 /* First, the polynomial itself and its table of feedback terms. The */
36 /* 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 */
38 /* Note that we take it "backwards" and put the highest-order term in */
39 /* the lowest-order bit. The X^32 term is "implied"; the LSB is the */
40 /* X^31 term, etc. The X^0 term (usually shown as "+1") results in */
41 /* the MSB being 1. */
43 /* Note that the usual hardware shift register implementation, which */
44 /* is what we're using (we're merely optimizing it by doing eight-bit */
45 /* chunks at a time) shifts bits into the lowest-order term. In our */
46 /* implementation, that means shifting towards the right. Why do we */
47 /* do it this way? Because the calculated CRC must be transmitted in */
48 /* order from highest-order term to lowest-order term. UARTs transmit */
49 /* characters in order from LSB to MSB. By storing the CRC this way, */
50 /* we hand it to the UART in the order low-byte to high-byte; the UART */
51 /* sends each low-bit to hight-bit; and the result is transmission bit */
52 /* by bit from highest- to lowest-order term without requiring any bit */
53 /* shuffling on our part. Reception works similarly. */
55 /* The feedback terms table consists of 256, 32-bit entries. Notes: */
57 /* The table can be generated at runtime if desired; code to do so */
58 /* is shown later. It might not be obvious, but the feedback */
59 /* terms simply represent the results of eight shift/xor opera- */
60 /* tions for all combinations of data and CRC register values. */
62 /* The values must be right-shifted by eight bits by the "updcrc" */
63 /* logic; the shift must be unsigned (bring in zeroes). On some */
64 /* hardware you could probably optimize the shift in assembler by */
65 /* using byte-swap instructions. */
66 /* polynomial $edb88320 */
68 /* -------------------------------------------------------------------- */
75 static unsigned long crc32_tab
[] = {
76 0x00000000L
, 0x77073096L
, 0xee0e612cL
, 0x990951baL
, 0x076dc419L
,
77 0x706af48fL
, 0xe963a535L
, 0x9e6495a3L
, 0x0edb8832L
, 0x79dcb8a4L
,
78 0xe0d5e91eL
, 0x97d2d988L
, 0x09b64c2bL
, 0x7eb17cbdL
, 0xe7b82d07L
,
79 0x90bf1d91L
, 0x1db71064L
, 0x6ab020f2L
, 0xf3b97148L
, 0x84be41deL
,
80 0x1adad47dL
, 0x6ddde4ebL
, 0xf4d4b551L
, 0x83d385c7L
, 0x136c9856L
,
81 0x646ba8c0L
, 0xfd62f97aL
, 0x8a65c9ecL
, 0x14015c4fL
, 0x63066cd9L
,
82 0xfa0f3d63L
, 0x8d080df5L
, 0x3b6e20c8L
, 0x4c69105eL
, 0xd56041e4L
,
83 0xa2677172L
, 0x3c03e4d1L
, 0x4b04d447L
, 0xd20d85fdL
, 0xa50ab56bL
,
84 0x35b5a8faL
, 0x42b2986cL
, 0xdbbbc9d6L
, 0xacbcf940L
, 0x32d86ce3L
,
85 0x45df5c75L
, 0xdcd60dcfL
, 0xabd13d59L
, 0x26d930acL
, 0x51de003aL
,
86 0xc8d75180L
, 0xbfd06116L
, 0x21b4f4b5L
, 0x56b3c423L
, 0xcfba9599L
,
87 0xb8bda50fL
, 0x2802b89eL
, 0x5f058808L
, 0xc60cd9b2L
, 0xb10be924L
,
88 0x2f6f7c87L
, 0x58684c11L
, 0xc1611dabL
, 0xb6662d3dL
, 0x76dc4190L
,
89 0x01db7106L
, 0x98d220bcL
, 0xefd5102aL
, 0x71b18589L
, 0x06b6b51fL
,
90 0x9fbfe4a5L
, 0xe8b8d433L
, 0x7807c9a2L
, 0x0f00f934L
, 0x9609a88eL
,
91 0xe10e9818L
, 0x7f6a0dbbL
, 0x086d3d2dL
, 0x91646c97L
, 0xe6635c01L
,
92 0x6b6b51f4L
, 0x1c6c6162L
, 0x856530d8L
, 0xf262004eL
, 0x6c0695edL
,
93 0x1b01a57bL
, 0x8208f4c1L
, 0xf50fc457L
, 0x65b0d9c6L
, 0x12b7e950L
,
94 0x8bbeb8eaL
, 0xfcb9887cL
, 0x62dd1ddfL
, 0x15da2d49L
, 0x8cd37cf3L
,
95 0xfbd44c65L
, 0x4db26158L
, 0x3ab551ceL
, 0xa3bc0074L
, 0xd4bb30e2L
,
96 0x4adfa541L
, 0x3dd895d7L
, 0xa4d1c46dL
, 0xd3d6f4fbL
, 0x4369e96aL
,
97 0x346ed9fcL
, 0xad678846L
, 0xda60b8d0L
, 0x44042d73L
, 0x33031de5L
,
98 0xaa0a4c5fL
, 0xdd0d7cc9L
, 0x5005713cL
, 0x270241aaL
, 0xbe0b1010L
,
99 0xc90c2086L
, 0x5768b525L
, 0x206f85b3L
, 0xb966d409L
, 0xce61e49fL
,
100 0x5edef90eL
, 0x29d9c998L
, 0xb0d09822L
, 0xc7d7a8b4L
, 0x59b33d17L
,
101 0x2eb40d81L
, 0xb7bd5c3bL
, 0xc0ba6cadL
, 0xedb88320L
, 0x9abfb3b6L
,
102 0x03b6e20cL
, 0x74b1d29aL
, 0xead54739L
, 0x9dd277afL
, 0x04db2615L
,
103 0x73dc1683L
, 0xe3630b12L
, 0x94643b84L
, 0x0d6d6a3eL
, 0x7a6a5aa8L
,
104 0xe40ecf0bL
, 0x9309ff9dL
, 0x0a00ae27L
, 0x7d079eb1L
, 0xf00f9344L
,
105 0x8708a3d2L
, 0x1e01f268L
, 0x6906c2feL
, 0xf762575dL
, 0x806567cbL
,
106 0x196c3671L
, 0x6e6b06e7L
, 0xfed41b76L
, 0x89d32be0L
, 0x10da7a5aL
,
107 0x67dd4accL
, 0xf9b9df6fL
, 0x8ebeeff9L
, 0x17b7be43L
, 0x60b08ed5L
,
108 0xd6d6a3e8L
, 0xa1d1937eL
, 0x38d8c2c4L
, 0x4fdff252L
, 0xd1bb67f1L
,
109 0xa6bc5767L
, 0x3fb506ddL
, 0x48b2364bL
, 0xd80d2bdaL
, 0xaf0a1b4cL
,
110 0x36034af6L
, 0x41047a60L
, 0xdf60efc3L
, 0xa867df55L
, 0x316e8eefL
,
111 0x4669be79L
, 0xcb61b38cL
, 0xbc66831aL
, 0x256fd2a0L
, 0x5268e236L
,
112 0xcc0c7795L
, 0xbb0b4703L
, 0x220216b9L
, 0x5505262fL
, 0xc5ba3bbeL
,
113 0xb2bd0b28L
, 0x2bb45a92L
, 0x5cb36a04L
, 0xc2d7ffa7L
, 0xb5d0cf31L
,
114 0x2cd99e8bL
, 0x5bdeae1dL
, 0x9b64c2b0L
, 0xec63f226L
, 0x756aa39cL
,
115 0x026d930aL
, 0x9c0906a9L
, 0xeb0e363fL
, 0x72076785L
, 0x05005713L
,
116 0x95bf4a82L
, 0xe2b87a14L
, 0x7bb12baeL
, 0x0cb61b38L
, 0x92d28e9bL
,
117 0xe5d5be0dL
, 0x7cdcefb7L
, 0x0bdbdf21L
, 0x86d3d2d4L
, 0xf1d4e242L
,
118 0x68ddb3f8L
, 0x1fda836eL
, 0x81be16cdL
, 0xf6b9265bL
, 0x6fb077e1L
,
119 0x18b74777L
, 0x88085ae6L
, 0xff0f6a70L
, 0x66063bcaL
, 0x11010b5cL
,
120 0x8f659effL
, 0xf862ae69L
, 0x616bffd3L
, 0x166ccf45L
, 0xa00ae278L
,
121 0xd70dd2eeL
, 0x4e048354L
, 0x3903b3c2L
, 0xa7672661L
, 0xd06016f7L
,
122 0x4969474dL
, 0x3e6e77dbL
, 0xaed16a4aL
, 0xd9d65adcL
, 0x40df0b66L
,
123 0x37d83bf0L
, 0xa9bcae53L
, 0xdebb9ec5L
, 0x47b2cf7fL
, 0x30b5ffe9L
,
124 0xbdbdf21cL
, 0xcabac28aL
, 0x53b39330L
, 0x24b4a3a6L
, 0xbad03605L
,
125 0xcdd70693L
, 0x54de5729L
, 0x23d967bfL
, 0xb3667a2eL
, 0xc4614ab8L
,
126 0x5d681b02L
, 0x2a6f2b94L
, 0xb40bbe37L
, 0xc30c8ea1L
, 0x5a05df1bL
,
130 /* Return a 32-bit CRC of the contents of the buffer. */
132 crc32 (const unsigned char *s
, unsigned int len
)
135 unsigned long crc32val
;
138 for (i
= 0; i
< len
; i
++) {
139 crc32val
= crc32_tab
[(crc32val
^ s
[i
]) & 0xff] ^ (crc32val
>> 8);
146 str2arr (char **pparv
, char *string
, char *delim
)
151 tok
= (char *) strtok (string
, delim
);
152 while (tok
!= NULL
) {
153 pparv
[pparc
++] = tok
;
154 tok
= (char *) strtok (NULL
, delim
);
166 data
= conf_get_data("server/key1", RECDB_QSTRING
);
167 KEY
= data
? atoi(data
) : 45432;
171 data
= conf_get_data("server/key2", RECDB_QSTRING
);
172 KEY2
= data
? atoi(data
) : 76934;
176 data
= conf_get_data("server/key3", RECDB_QSTRING
);
177 KEY3
= data
? atoi(data
) : 98336;
184 make_virthost (char *curr
, char *host
, char *virt
)
186 static char mask
[HOSTLEN
+ 1];
187 char *parv
[HOSTLEN
+ 1], *parv2
[HOSTLEN
+ 1], s
[HOSTLEN
+ 1], s2
[HOSTLEN
+ 2];
188 int parc
= 0, parc2
= 0, len
= 0;
189 unsigned int hash
[8];
191 if ((strlen(host
) < 3) || (strlen(curr
) < 3))
194 strncpy (s
, curr
, HOSTLEN
);
195 strncpy (s2
, host
, HOSTLEN
);
197 parc
= str2arr (parv
, s
, ".");
198 parc2
= str2arr (parv2
, s2
, ".");
202 hash
[0] = ((crc32 ((unsigned char *)parv
[3], strlen (parv
[3])) + KEY2
) ^ KEY
) ^ KEY3
;
203 hash
[1] = ((crc32 ((unsigned char *)parv
[2], strlen (parv
[2])) + KEY2
) ^ KEY
) ^ KEY3
;
212 len
= strlen (parv2
[3]);
213 if (strchr ("0123456789", parv2
[3][len
- 1])) {
214 hash
[2] = ((crc32 ((unsigned char *)parv
[1], strlen (parv
[1])) + KEY2
) ^ KEY
) ^ KEY3
;
219 snprintf(mask
, HOSTLEN
, "%x.%x.%x.IP", hash
[0], hash
[1], hash
[2]);
221 snprintf(mask
, HOSTLEN
, "%x.%x.%s.%s.%s",
222 hash
[0], hash
[1], parv2
[parc2
- 3], parv2
[parc2
- 2],
227 snprintf(mask
, HOSTLEN
, "%x.%x.%s.%s.%s",
228 hash
[0], hash
[1], parv2
[parc2
- 3], parv2
[parc2
- 2],
231 snprintf(mask
, HOSTLEN
, "%x.%x.%s.%s",
232 hash
[0], hash
[1], parv2
[parc2
- 2],
236 safestrncpy (virt
, mask
, HOSTLEN
);
241 make_virtip (char *curr
, char *host
, char *virt
)
243 static char mask
[HOSTLEN
+ 1];
244 char *parv
[HOSTLEN
+ 1], *parv2
[HOSTLEN
+ 1], s
[HOSTLEN
+ 1], s2
[HOSTLEN
+ 2];
245 int parc
= 0, parc2
= 0, len
= 0;
246 unsigned int hash
[8];
248 if ((strlen(host
) < 3) || (strlen(curr
) < 3))
251 strncpy (s
, curr
, HOSTLEN
);
252 strncpy (s2
, host
, HOSTLEN
);
254 parc
= str2arr (parv
, s
, ".");
255 parc2
= str2arr (parv2
, s2
, ".");
259 hash
[0] = ((crc32 ((unsigned char *)parv
[3], strlen (parv
[3])) + KEY2
) ^ KEY
) ^ KEY3
;
260 hash
[1] = ((crc32 ((unsigned char *)parv
[2], strlen (parv
[2])) + KEY2
) ^ KEY
) ^ KEY3
;
268 len
= strlen (parv2
[3]);
269 if (strchr ("0123456789", parv2
[3][len
- 1])) {
270 hash
[2] = ((crc32 ((unsigned char *)parv
[1], strlen (parv
[1])) + KEY2
) ^ KEY
) ^ KEY3
;
275 snprintf(mask
, HOSTLEN
, "%x.%x.%x.IP", hash
[0], hash
[1], hash
[2]);
277 snprintf(mask
, HOSTLEN
, "%x.%x.%s.%s.%s",
278 hash
[0], hash
[1], parv2
[parc2
- 3], parv2
[parc2
- 2],
282 safestrncpy(virt
, mask
, SOCKIPLEN
+ 30);
287 make_ipv6virthost (char *curr
, char *host
, char *new)
289 static char mask
[HOSTLEN
+ 1];
290 char *parv
[HOSTLEN
+ 1], *parv2
[HOSTLEN
+ 1], s
[HOSTLEN
+ 1],
291 s2
[HOSTLEN
+ 2], s3
[HOSTLEN
+ 2];
292 int parc
= 0, parc2
= 0;
293 unsigned int hash
[8];
295 if ((strlen(host
) < 3) || (strlen(curr
) < 3))
298 strncpy (s
, curr
, HOSTLEN
);
299 strncpy (s2
, host
, HOSTLEN
);
303 parc
= str2arr (parv
, s3
, ":");
304 parc2
= str2arr (parv2
, s2
, ".");
308 hash
[0] = ((crc32 ((unsigned char *)parv
[0], strlen (parv
[0])) + KEY2
) ^ KEY
) ^ KEY3
;
309 hash
[1] = ((crc32 ((unsigned char *)parv
[1], strlen (parv
[1])) + KEY2
) ^ KEY
) ^ KEY3
;
318 snprintf(mask
, HOSTLEN
, "%x.%x.%s.%s.%s",
319 hash
[0], hash
[1], parv2
[parc2
- 3], parv2
[parc2
- 2],
322 hash
[2] = ((crc32 ((unsigned char *)parv
[2], strlen (parv
[2])) + KEY2
) ^ KEY
) ^ KEY3
;
323 hash
[3] = ((crc32 ((unsigned char *)parv
[3], strlen (parv
[3])) + KEY2
) ^ KEY
) ^ KEY3
;
324 hash
[4] = ((crc32 ((unsigned char *)parv
[4], strlen (parv
[4])) + KEY2
) ^ KEY
) ^ KEY3
;
325 hash
[5] = ((crc32 ((unsigned char *)parv
[5], strlen (parv
[5])) + KEY2
) ^ KEY
) ^ KEY3
;
326 hash
[6] = ((crc32 ((unsigned char *)parv
[6], strlen (parv
[6])) + KEY2
) ^ KEY
) ^ KEY3
;
327 hash
[7] = ((crc32 ((unsigned char *)parv
[7], strlen (parv
[7])) + KEY2
) ^ KEY
) ^ KEY3
;
347 snprintf(mask
, HOSTLEN
, "%x:%x:%x:%x:%x:%x:%x:%x",
348 hash
[0] / 10000, hash
[1] / 10000, hash
[2] / 10000,
349 hash
[3] / 10000, hash
[4] / 10000, hash
[5] / 10000,
350 hash
[6] / 10000, hash
[7] / 10000);
353 strncpy (new, mask
, HOSTLEN
);
358 ip62arr (char *string
, char *dest
)
360 char fields
[8][5], temp
[HOSTLEN
+ 1];
361 char *pointer
= string
;
362 int numberOfColons
= 0, i
= 0, j
= 0, k
= 0;
363 int length
= strlen (string
), missing
= 8;
365 while ((*pointer
++)) {
366 if ((*pointer
) == ':')
370 memset (fields
, 0, sizeof (fields
));
372 for (i
= 0; i
< length
+ 1; i
++) {
373 if (string
[i
] == ':') {
376 if (string
[i
+ 1] == ':') {
377 if (string
[i
+ 2] == '\0') {
378 missing
= 9 - numberOfColons
;
380 missing
= 8 - numberOfColons
;
383 while (missing
> 0) {
391 fields
[j
][k
++] = string
[i
];
395 strcpy (temp
, fields
[0]);
397 for (i
= 1; i
< 8; i
++) {
398 strcat (temp
, fields
[i
]);