| 1 |
/* MODULE CONFIGURATION FOLLOWS -- please read!! */ |
| 2 |
|
| 3 |
/* Change these numbers to something else. Please |
| 4 |
* make sure that they match on ALL servers |
| 5 |
* to avoid problems! |
| 6 |
*/ |
| 7 |
#define KEY 23857 |
| 8 |
#define KEY2 38447 |
| 9 |
#define KEY3 64709 |
| 10 |
|
| 11 |
/* END OF MODULE CONFIGURATION */ |
| 12 |
|
| 13 |
/* |
| 14 |
* ircd-hybrid: an advanced Internet Relay Chat Daemon (ircd). |
| 15 |
* ip_cloaking.c: Provides hostname (partial) cloaking for clients. |
| 16 |
* |
| 17 |
* Copyright (c) 2005 by the past and present ircd coders, and others. |
| 18 |
* |
| 19 |
* This program is free software; you can redistribute it and/or modify |
| 20 |
* it under the terms of the GNU General Public License as published by |
| 21 |
* the Free Software Foundation; either version 2 of the License, or |
| 22 |
* (at you option) any later version. |
| 23 |
* |
| 24 |
* This program is distributed in the hope that it will be useful, |
| 25 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 26 |
* MERCHANTABILILTY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 27 |
* GNU General Public License for more details. |
| 28 |
* |
| 29 |
* You should have recieved a copy of the GNU General Public License |
| 30 |
* along with this program; if not, write to the Free Software |
| 31 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 32 |
* USA |
| 33 |
* |
| 34 |
* $Id$ |
| 35 |
*/ |
| 36 |
|
| 37 |
/* |
| 38 |
* Originally re-written from AustNet's VirtualWorld Code. |
| 39 |
* Virtual World written by Roger 'RogerY' Yerramesetti <rogery@austnet.org> |
| 40 |
* |
| 41 |
* Re-written using the crc32 encryption implementation by //ylo based on the original |
| 42 |
* implementation by Gary S. Brown. |
| 43 |
* |
| 44 |
* HiddenHost implementation based on the code from Unreal IRCd by |
| 45 |
* RaYmAn, NiQuiL, narf, Griever (great thinking) eternal, bball, JK.@ roxnet.org |
| 46 |
* |
| 47 |
* Additional ideas and code by ShadowMaster, [-Th3Dud3-] (RageIRCd), Solaris @ Demonkarma.net, |
| 48 |
* Alan 'knight-' LeVee of the ChatJunkies IRC Network and doughk_ff7. |
| 49 |
*/ |
| 50 |
|
| 51 |
#include "stdinc.h" |
| 52 |
#include "whowas.h" |
| 53 |
#include "channel_mode.h" |
| 54 |
#include "client.h" |
| 55 |
#include "common.h" |
| 56 |
#include "hash.h" |
| 57 |
#include "hook.h" |
| 58 |
#include "irc_string.h" |
| 59 |
#include "ircd.h" |
| 60 |
#include "ircd_defs.h" |
| 61 |
#include "numeric.h" |
| 62 |
#include "s_serv.h" |
| 63 |
#include "s_user.h" |
| 64 |
#include "send.h" |
| 65 |
#include "s_conf.h" |
| 66 |
#include "modules.h" |
| 67 |
#include "memory.h" |
| 68 |
#include "s_log.h" |
| 69 |
#include "sprintf_irc.h" |
| 70 |
|
| 71 |
static unsigned int umode_vhost = 0; |
| 72 |
static int vhost_ipv6_err; |
| 73 |
static dlink_node *prev_enter_umode; |
| 74 |
static dlink_node *prev_umode; |
| 75 |
|
| 76 |
const char *_version = "$Revision$"; |
| 77 |
|
| 78 |
static void *reset_ipv6err_flag(va_list); |
| 79 |
static void *h_set_user_mode(va_list); |
| 80 |
|
| 81 |
void _modinit(void) |
| 82 |
{ |
| 83 |
if (!user_modes['h']) |
| 84 |
{ |
| 85 |
unsigned int all_umodes = 0, i; |
| 86 |
|
| 87 |
for (i = 0; i < 128; i++) |
| 88 |
all_umodes |= user_modes[i]; |
| 89 |
|
| 90 |
for (umode_vhost = 1; umode_vhost && (all_umodes & umode_vhost); |
| 91 |
umode_vhost <<= 1); |
| 92 |
|
| 93 |
if (!umode_vhost) |
| 94 |
{ |
| 95 |
ilog(L_ERROR, "You have more than 32 usermodes, " |
| 96 |
"IP cloaking not installed"); |
| 97 |
sendto_realops_flags(UMODE_ALL, L_ALL, "You have more than " |
| 98 |
"32 usermodes, IP cloaking not installed"); |
| 99 |
return; |
| 100 |
} |
| 101 |
|
| 102 |
user_modes['h'] = umode_vhost; |
| 103 |
assemble_umode_buffer(); |
| 104 |
} |
| 105 |
else |
| 106 |
{ |
| 107 |
ilog(L_ERROR, "Usermode +h already in use, IP cloaking not installed"); |
| 108 |
sendto_realops_flags(UMODE_ALL, L_ALL, "Usermode +h already in use, " |
| 109 |
"IP cloaking not installed"); |
| 110 |
return; |
| 111 |
} |
| 112 |
|
| 113 |
prev_enter_umode = install_hook(entering_umode_cb, reset_ipv6err_flag); |
| 114 |
prev_umode = install_hook(umode_cb, h_set_user_mode); |
| 115 |
} |
| 116 |
|
| 117 |
void _moddeinit(void) |
| 118 |
{ |
| 119 |
if (umode_vhost) |
| 120 |
{ |
| 121 |
dlink_node *ptr; |
| 122 |
|
| 123 |
DLINK_FOREACH(ptr, local_client_list.head) |
| 124 |
{ |
| 125 |
struct Client *cptr = ptr->data; |
| 126 |
cptr->umodes &= ~umode_vhost; |
| 127 |
} |
| 128 |
|
| 129 |
user_modes['h'] = 0; |
| 130 |
assemble_umode_buffer(); |
| 131 |
|
| 132 |
uninstall_hook(entering_umode_cb, reset_ipv6err_flag); |
| 133 |
uninstall_hook(umode_cb, h_set_user_mode); |
| 134 |
} |
| 135 |
} |
| 136 |
|
| 137 |
/* |
| 138 |
* The implementation originally comes from Gary S. Brown. The tables |
| 139 |
* are a direct transplant of his original concept and have been |
| 140 |
* changed for randomization purposes. Minor changes were also made |
| 141 |
* to the crc32-function by //ylo. |
| 142 |
* |
| 143 |
* knight- |
| 144 |
*/ |
| 145 |
|
| 146 |
/* ============================================================= |
| 147 |
* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or |
| 148 |
* code or tables extracted from it, as desired without restriction. |
| 149 |
* |
| 150 |
* First, the polynomial itself and its stable of feedback terms. The |
| 151 |
* polynomial is: |
| 152 |
* |
| 153 |
* 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 |
| 154 |
* |
| 155 |
* Note that we take it "backwards" and put the highest-order term in |
| 156 |
* the lowest-order bit. The X^32 term is "implied"; the LSB is the |
| 157 |
* X^31 term, etc. The X^0 term (usually shown as "+1") results in |
| 158 |
* the MSB being 1. |
| 159 |
* |
| 160 |
* Note that the usual hardware shift register implementation, which |
| 161 |
* is what we're using (we're merely optimizing it by doing eight-bit |
| 162 |
* chunks at a time) shifts bits into the lowest-order term. In our |
| 163 |
* implementation, that means shifting towards the right. Why do we |
| 164 |
* do it this way? Because the calculated CRC must be transmitted in |
| 165 |
* order from highest-order term to lowest-order term. UARTs transmit |
| 166 |
* characters in order from LSB to MSB. By storing the CRC this way, |
| 167 |
* we and it to the UART in the order low-byte to high-byte; the UART |
| 168 |
* sends each low-bit to high-bit; and the result is transmission bit |
| 169 |
* by bit from highest-order to lowest-order term without requiring any |
| 170 |
* bit shuffling on our part. Reception works similarly. |
| 171 |
* |
| 172 |
* The feedback term table consists of 256, 32-bit entries. Notes: |
| 173 |
* |
| 174 |
* The table can be generated at runtime if desired; code to do so |
| 175 |
* is shown later. It might not be obvious, but the feedback terms |
| 176 |
* simply represent the results of eight shift/xor operations for |
| 177 |
* all combinations of data and CRC register values. |
| 178 |
* |
| 179 |
* The values must be right shifted by eight bits by the "updcrc" |
| 180 |
* logic; the shift must be unsigned (bring in zeroes). On some hardware |
| 181 |
* you could probably optimize the shift in assembler by using byte-swap |
| 182 |
* instructions. |
| 183 |
* |
| 184 |
* polynomial $edb88320 |
| 185 |
* |
| 186 |
* -------------------------------------------------------------------- |
| 187 |
*/ |
| 188 |
|
| 189 |
static unsigned long crc32_tab[] = { |
| 190 |
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, |
| 191 |
0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, |
| 192 |
0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, |
| 193 |
0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, |
| 194 |
0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, |
| 195 |
0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, |
| 196 |
0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, |
| 197 |
0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, |
| 198 |
0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, |
| 199 |
0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, |
| 200 |
0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, |
| 201 |
0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, |
| 202 |
0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, |
| 203 |
0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, |
| 204 |
0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, |
| 205 |
0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, |
| 206 |
0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, |
| 207 |
0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, |
| 208 |
0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, |
| 209 |
0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, |
| 210 |
0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, |
| 211 |
0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, |
| 212 |
0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, |
| 213 |
0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, |
| 214 |
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, |
| 215 |
0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, |
| 216 |
0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, |
| 217 |
0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, |
| 218 |
0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, |
| 219 |
0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, |
| 220 |
0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, |
| 221 |
0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, |
| 222 |
0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, |
| 223 |
0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, |
| 224 |
0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, |
| 225 |
0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, |
| 226 |
0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, |
| 227 |
0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, |
| 228 |
0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, |
| 229 |
0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, |
| 230 |
0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, |
| 231 |
0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, |
| 232 |
0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, |
| 233 |
0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, |
| 234 |
0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, |
| 235 |
0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, |
| 236 |
0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, |
| 237 |
0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, |
| 238 |
0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, |
| 239 |
0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, |
| 240 |
0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, |
| 241 |
0x2d02ef8dL |
| 242 |
}; |
| 243 |
|
| 244 |
static unsigned long |
| 245 |
crc32(const char *s, unsigned int len) |
| 246 |
{ |
| 247 |
unsigned int i; |
| 248 |
unsigned long crc32val = 0; |
| 249 |
|
| 250 |
for (i = 0; i < len; i++) |
| 251 |
crc32val = crc32_tab[(crc32val ^ s[i]) & 0xff] ^ (crc32val >> 8); |
| 252 |
|
| 253 |
return crc32val; |
| 254 |
} |
| 255 |
|
| 256 |
/* |
| 257 |
* str2arr() |
| 258 |
* |
| 259 |
* converts IPv4 address segments into arrays |
| 260 |
* for encryption |
| 261 |
* |
| 262 |
* inputs - address parvs, strings and deliminator |
| 263 |
* outputs - array |
| 264 |
* side effects - not IPv6 friendly |
| 265 |
*/ |
| 266 |
static int |
| 267 |
str2arr (char **pparv, char *string, char *delim) |
| 268 |
{ |
| 269 |
char *tok; |
| 270 |
int pparc = 0; |
| 271 |
|
| 272 |
/* Diane had suggested to use this method rather than while() -- knight */ |
| 273 |
for (tok = strtok (string, delim); tok != NULL; tok = strtok (NULL, delim)) |
| 274 |
{ |
| 275 |
pparv[pparc++] = tok; |
| 276 |
} |
| 277 |
|
| 278 |
return pparc; |
| 279 |
} |
| 280 |
|
| 281 |
/* |
| 282 |
* make_virthost() |
| 283 |
* |
| 284 |
* curr = current hostname/ip |
| 285 |
* host = current host socket |
| 286 |
* new = encrypted hostname/ip |
| 287 |
*/ |
| 288 |
static void |
| 289 |
make_virthost(char *curr, char *host, char *new) |
| 290 |
{ |
| 291 |
char mask[HOSTLEN + 1]; |
| 292 |
char *parv[HOSTLEN + 1], *parv2[HOSTLEN + 1], s[HOSTLEN + 1], s2[HOSTLEN + 1]; |
| 293 |
int parc = 0, parc2 = 0, len = 0; |
| 294 |
unsigned long hash[8]; |
| 295 |
|
| 296 |
strlcpy(s2, curr, HOSTLEN + 1); |
| 297 |
strlcpy(s, host, HOSTLEN + 1); |
| 298 |
|
| 299 |
parc = str2arr(parv, s, "."); |
| 300 |
parc2 = str2arr(parv2, s2, "."); |
| 301 |
|
| 302 |
if (!parc2) |
| 303 |
return; |
| 304 |
|
| 305 |
hash[0] = ((crc32 (parv[3], strlen (parv[3])) + KEY) ^ KEY2) ^ KEY3; |
| 306 |
hash[1] = ((KEY2 ^ crc32 (parv[2], strlen (parv[2]))) + KEY3) ^ KEY; |
| 307 |
hash[2] = ((crc32 (parv[1], strlen (parv[1])) + KEY3) ^ KEY) ^ KEY2; |
| 308 |
hash[3] = ((KEY3 ^ crc32 (parv[0], strlen (parv[0]))) + KEY2) ^ KEY; |
| 309 |
|
| 310 |
hash[0] <<= 2; |
| 311 |
hash[0] >>= 2; |
| 312 |
hash[0] &= 0x3FFFFFFF; |
| 313 |
hash[0] &= 0xFFFFFFFF; |
| 314 |
hash[1] <<= 2; |
| 315 |
hash[1] >>= 2; |
| 316 |
hash[1] &= 0x7FFFFFFF; |
| 317 |
hash[1] &= 0x3FFFFFFF; |
| 318 |
hash[2] <<= 2; |
| 319 |
hash[2] >>= 2; |
| 320 |
hash[2] &= 0x7FFFFFFF; |
| 321 |
hash[2] &= 0xFFFFFFFF; |
| 322 |
hash[3] <<= 2; |
| 323 |
hash[3] >>= 2; |
| 324 |
hash[3] &= 0x3FFFFFFF; |
| 325 |
hash[3] &= 0x7FFFFFFF; |
| 326 |
|
| 327 |
/* IPv4 */ |
| 328 |
if (parc2 == 4 || parc2 < 2) |
| 329 |
{ |
| 330 |
len = strlen (parv2[3]); |
| 331 |
|
| 332 |
if (strchr("0123456789", parv2[3][len - 1]) || parc2 < 2) |
| 333 |
{ |
| 334 |
ircsprintf(mask, "%s.%s.%s.%lx", |
| 335 |
parv2[parc2 - 4], parv2[parc2 - 3], |
| 336 |
parv2[parc2 - 2], hash[3]); |
| 337 |
} |
| 338 |
else |
| 339 |
{ |
| 340 |
/* isp.tld */ |
| 341 |
ircsprintf(mask, "%lx-%lx.%s.%s", |
| 342 |
hash[0], hash[3], parv2[parc2 - 2], parv2[parc2 - 1]); |
| 343 |
} |
| 344 |
} |
| 345 |
else |
| 346 |
{ |
| 347 |
if (parc2 >= 4) |
| 348 |
{ |
| 349 |
/* isp.sub.tld or district.isp.tld */ |
| 350 |
ircsprintf(mask, "%lx-%lx.%s.%s.%s", |
| 351 |
hash[3], hash[1], parv2[parc2 - 3], parv2[parc2 - 2], |
| 352 |
parv2[parc2 - 1]); |
| 353 |
} |
| 354 |
else |
| 355 |
{ |
| 356 |
/* isp.tld */ |
| 357 |
ircsprintf(mask, "%lx-%lx.%s.%s", |
| 358 |
hash[0], hash[3], parv2[parc2 - 2], parv2[parc2 - 1]); |
| 359 |
} |
| 360 |
|
| 361 |
if (parc2 >= 5) |
| 362 |
{ |
| 363 |
/* zone.district.isp.tld or district.isp.sub.tld */ |
| 364 |
ircsprintf(mask, "%lx-%lx.%s.%s.%s.%s", |
| 365 |
hash[1], hash[0], parv2[parc2 - 4], parv2[parc2 - 3], |
| 366 |
parv2[parc2 - 2], parv2[parc2 - 1]); |
| 367 |
} |
| 368 |
else |
| 369 |
{ |
| 370 |
/* isp.tld */ |
| 371 |
ircsprintf(mask, "%lx-%lx.%s.%s", |
| 372 |
hash[0], hash[3], parv2[parc2 - 2], parv2[parc2 - 1]); |
| 373 |
} |
| 374 |
} |
| 375 |
|
| 376 |
strlcpy(new, mask, HOSTLEN + 1); |
| 377 |
} |
| 378 |
|
| 379 |
/* |
| 380 |
* set_vhost() |
| 381 |
* |
| 382 |
* inputs - pointer to given client to set IP cloak. |
| 383 |
* outputs - NONE |
| 384 |
* side effects - NONE |
| 385 |
*/ |
| 386 |
static void |
| 387 |
set_vhost(struct Client *client_p, struct Client *source_p, |
| 388 |
struct Client *target_p) |
| 389 |
{ |
| 390 |
target_p->umodes |= umode_vhost; |
| 391 |
SetIPSpoof(target_p); |
| 392 |
make_virthost(target_p->host, target_p->sockhost, target_p->host); |
| 393 |
|
| 394 |
if (IsClient(target_p)) |
| 395 |
sendto_server(client_p, NULL, CAP_ENCAP, NOCAPS, |
| 396 |
":%s ENCAP * CHGHOST %s %s", |
| 397 |
me.name, target_p->name, target_p->host); |
| 398 |
|
| 399 |
sendto_one(target_p, form_str(RPL_HOSTHIDDEN), |
| 400 |
me.name, target_p->name, target_p->host); |
| 401 |
} |
| 402 |
|
| 403 |
static void * |
| 404 |
reset_ipv6err_flag(va_list args) |
| 405 |
{ |
| 406 |
struct Client *client_p = va_arg(args, struct Client *); |
| 407 |
struct Client *source_p = va_arg(args, struct Client *); |
| 408 |
|
| 409 |
vhost_ipv6_err = NO; |
| 410 |
|
| 411 |
return pass_callback(prev_enter_umode, client_p, source_p); |
| 412 |
} |
| 413 |
|
| 414 |
static void * |
| 415 |
h_set_user_mode(va_list args) |
| 416 |
{ |
| 417 |
struct Client *client_p = va_arg(args, struct Client *); |
| 418 |
struct Client *target_p = va_arg(args, struct Client *); |
| 419 |
int what = va_arg(args, int); |
| 420 |
unsigned int flag = va_arg(args, unsigned int); |
| 421 |
|
| 422 |
if (flag == umode_vhost) |
| 423 |
{ |
| 424 |
if (what == MODE_ADD) |
| 425 |
{ |
| 426 |
/* Automatically break if any of these conditions are met. -- knight- */ |
| 427 |
if (!MyConnect(target_p)) |
| 428 |
return NULL; |
| 429 |
|
| 430 |
if (IsIPSpoof(target_p)) |
| 431 |
return NULL; |
| 432 |
|
| 433 |
/* |
| 434 |
* IPv6 could potentially core the server if a user connected via IPv6 sets +h |
| 435 |
* so we need to check and break before that happens. -- knight- |
| 436 |
*/ |
| 437 |
#ifdef IPV6 |
| 438 |
if (target_p->localClient->aftype == AF_INET6) |
| 439 |
{ |
| 440 |
if (!vhost_ipv6_err) |
| 441 |
{ |
| 442 |
sendto_one(target_p, ":%s NOTICE %s :*** Sorry, IP cloaking " |
| 443 |
"does not support IPv6 users!", me.name, target_p->name); |
| 444 |
vhost_ipv6_err = YES; |
| 445 |
} |
| 446 |
} |
| 447 |
else |
| 448 |
#endif |
| 449 |
set_vhost(client_p, target_p, target_p); |
| 450 |
} |
| 451 |
|
| 452 |
return NULL; |
| 453 |
} |
| 454 |
|
| 455 |
return pass_callback(prev_umode, client_p, target_p, what, flag); |
| 456 |
} |
