| 1 |
/* |
| 2 |
Copyright (C) 2002 by the past and present ircd coders, and others. |
| 3 |
|
| 4 |
This program is free software; you can redistribute it and/or |
| 5 |
modify it under the terms of the GNU General Public License |
| 6 |
as published by the Free Software Foundation; either version 2 |
| 7 |
of the License, or (at your option) any later version. |
| 8 |
|
| 9 |
This program is distributed in the hope that it will be useful, |
| 10 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 |
GNU General Public License for more details. |
| 13 |
|
| 14 |
You should have received a copy of the GNU General Public License |
| 15 |
along with this program; if not, write to |
| 16 |
|
| 17 |
The Free Software Foundation, Inc. |
| 18 |
59 Temple Place - Suite 330 |
| 19 |
Boston, MA 02111-1307, USA. |
| 20 |
|
| 21 |
*/ |
| 22 |
|
| 23 |
/* |
| 24 |
* This code is borrowed from ircd-hybrid version 7 |
| 25 |
* -TimeMr14C |
| 26 |
*/ |
| 27 |
|
| 28 |
#include "setup.h" |
| 29 |
|
| 30 |
#include <errno.h> |
| 31 |
#include <stdio.h> |
| 32 |
#include <assert.h> |
| 33 |
#if STDC_HEADERS |
| 34 |
# include <string.h> |
| 35 |
# include <stdlib.h> |
| 36 |
#endif |
| 37 |
#ifdef HAVE_STRINGS_H |
| 38 |
# include <strings.h> |
| 39 |
#endif |
| 40 |
#include <sys/types.h> |
| 41 |
#include <sys/socket.h> |
| 42 |
#include <netinet/in.h> |
| 43 |
#include <netdb.h> |
| 44 |
|
| 45 |
#include "inet.h" |
| 46 |
#include "opm.h" |
| 47 |
|
| 48 |
#ifndef INADDRSZ |
| 49 |
#define INADDRSZ 4 |
| 50 |
#endif |
| 51 |
|
| 52 |
#ifdef IPV6 |
| 53 |
#ifndef IN6ADDRSZ |
| 54 |
#define IN6ADDRSZ 16 |
| 55 |
#endif |
| 56 |
#endif |
| 57 |
|
| 58 |
|
| 59 |
#ifndef INT16SZ |
| 60 |
#define INT16SZ 2 |
| 61 |
#endif |
| 62 |
|
| 63 |
#ifdef IPV6 |
| 64 |
#define HOSTIPLEN 53 |
| 65 |
#else |
| 66 |
#define HOSTIPLEN 15 |
| 67 |
#endif |
| 68 |
|
| 69 |
|
| 70 |
extern const unsigned char ToLowerTab[]; |
| 71 |
#define ToLower(c) (ToLowerTab[(unsigned char)(c)]) |
| 72 |
|
| 73 |
/* |
| 74 |
* From: Thomas Helvey <tomh@inxpress.net> |
| 75 |
*/ |
| 76 |
#if 0 |
| 77 |
static const char *IpQuadTab[] = { |
| 78 |
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", |
| 79 |
"10", "11", "12", "13", "14", "15", "16", "17", "18", "19", |
| 80 |
"20", "21", "22", "23", "24", "25", "26", "27", "28", "29", |
| 81 |
"30", "31", "32", "33", "34", "35", "36", "37", "38", "39", |
| 82 |
"40", "41", "42", "43", "44", "45", "46", "47", "48", "49", |
| 83 |
"50", "51", "52", "53", "54", "55", "56", "57", "58", "59", |
| 84 |
"60", "61", "62", "63", "64", "65", "66", "67", "68", "69", |
| 85 |
"70", "71", "72", "73", "74", "75", "76", "77", "78", "79", |
| 86 |
"80", "81", "82", "83", "84", "85", "86", "87", "88", "89", |
| 87 |
"90", "91", "92", "93", "94", "95", "96", "97", "98", "99", |
| 88 |
"100", "101", "102", "103", "104", "105", "106", "107", "108", "109", |
| 89 |
"110", "111", "112", "113", "114", "115", "116", "117", "118", "119", |
| 90 |
"120", "121", "122", "123", "124", "125", "126", "127", "128", "129", |
| 91 |
"130", "131", "132", "133", "134", "135", "136", "137", "138", "139", |
| 92 |
"140", "141", "142", "143", "144", "145", "146", "147", "148", "149", |
| 93 |
"150", "151", "152", "153", "154", "155", "156", "157", "158", "159", |
| 94 |
"160", "161", "162", "163", "164", "165", "166", "167", "168", "169", |
| 95 |
"170", "171", "172", "173", "174", "175", "176", "177", "178", "179", |
| 96 |
"180", "181", "182", "183", "184", "185", "186", "187", "188", "189", |
| 97 |
"190", "191", "192", "193", "194", "195", "196", "197", "198", "199", |
| 98 |
"200", "201", "202", "203", "204", "205", "206", "207", "208", "209", |
| 99 |
"210", "211", "212", "213", "214", "215", "216", "217", "218", "219", |
| 100 |
"220", "221", "222", "223", "224", "225", "226", "227", "228", "229", |
| 101 |
"230", "231", "232", "233", "234", "235", "236", "237", "238", "239", |
| 102 |
"240", "241", "242", "243", "244", "245", "246", "247", "248", "249", |
| 103 |
"250", "251", "252", "253", "254", "255" |
| 104 |
}; |
| 105 |
#endif |
| 106 |
|
| 107 |
/* |
| 108 |
* inetntoa - in_addr to string |
| 109 |
* changed name to remove collision possibility and |
| 110 |
* so behaviour is guaranteed to take a pointer arg. |
| 111 |
* -avalon 23/11/92 |
| 112 |
* inet_ntoa -- returned the dotted notation of a given |
| 113 |
* internet number |
| 114 |
* argv 11/90). |
| 115 |
* inet_ntoa -- its broken on some Ultrix/Dynix too. -avalon |
| 116 |
* |
| 117 |
* XXX - Again not used anywhere? |
| 118 |
* -grifferz |
| 119 |
*/ |
| 120 |
|
| 121 |
#if 0 |
| 122 |
static char *inetntoa(char *in) |
| 123 |
{ |
| 124 |
static char buf[16]; |
| 125 |
register char *bufptr = buf; |
| 126 |
register const unsigned char *a = (const unsigned char *) in; |
| 127 |
register const char *n; |
| 128 |
|
| 129 |
n = IpQuadTab[*a++]; |
| 130 |
while (*n) |
| 131 |
*bufptr++ = *n++; |
| 132 |
*bufptr++ = '.'; |
| 133 |
n = IpQuadTab[*a++]; |
| 134 |
while (*n) |
| 135 |
*bufptr++ = *n++; |
| 136 |
*bufptr++ = '.'; |
| 137 |
n = IpQuadTab[*a++]; |
| 138 |
while (*n) |
| 139 |
*bufptr++ = *n++; |
| 140 |
*bufptr++ = '.'; |
| 141 |
n = IpQuadTab[*a]; |
| 142 |
while (*n) |
| 143 |
*bufptr++ = *n++; |
| 144 |
*bufptr = '\0'; |
| 145 |
return buf; |
| 146 |
} |
| 147 |
#endif |
| 148 |
|
| 149 |
/* |
| 150 |
* Copyright (c) 1996-1999 by Internet Software Consortium. |
| 151 |
* |
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* Permission to use, copy, modify, and distribute this software for any |
| 153 |
* purpose with or without fee is hereby granted, provided that the above |
| 154 |
* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
| 157 |
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
| 158 |
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
| 159 |
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| 160 |
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 161 |
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
| 162 |
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| 163 |
* SOFTWARE. |
| 164 |
*/ |
| 165 |
|
| 166 |
/* |
| 167 |
* WARNING: Don't even consider trying to compile this on a system where |
| 168 |
* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. |
| 169 |
*/ |
| 170 |
|
| 171 |
/* |
| 172 |
* XXX - this does not seem to be used anywhere currently. |
| 173 |
* -grifferz |
| 174 |
*/ |
| 175 |
#if 0 |
| 176 |
static const char *inet_ntop4(const u_char *src, char *dst, unsigned int size); |
| 177 |
#endif |
| 178 |
|
| 179 |
#ifdef IPV6 |
| 180 |
static const char *inet_ntop6(const u_char *src, char *dst, unsigned int size); |
| 181 |
#endif |
| 182 |
|
| 183 |
/* const char * |
| 184 |
* inet_ntop4(src, dst, size) |
| 185 |
* format an IPv4 address |
| 186 |
* return: |
| 187 |
* `dst' (as a const) |
| 188 |
* notes: |
| 189 |
* (1) uses no statics |
| 190 |
* (2) takes a u_char* not an in_addr as input |
| 191 |
* author: |
| 192 |
* Paul Vixie, 1996. |
| 193 |
* |
| 194 |
* XXX - this does not seem to be used anywhere currently. |
| 195 |
* -grifferz |
| 196 |
*/ |
| 197 |
#if 0 |
| 198 |
static const char *inet_ntop4(const unsigned char *src, char *dst, unsigned int size) |
| 199 |
{ |
| 200 |
if (size < 15) |
| 201 |
return NULL; |
| 202 |
return strcpy(dst, inetntoa((char *) src)); |
| 203 |
} |
| 204 |
#endif |
| 205 |
|
| 206 |
/* const char * |
| 207 |
* inet_ntop6(src, dst, size) |
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* convert IPv6 binary address into presentation (printable) format |
| 209 |
* author: |
| 210 |
* Paul Vixie, 1996. |
| 211 |
*/ |
| 212 |
#ifdef IPV6 |
| 213 |
static const char *inet_ntop6(const unsigned char *src, char *dst, unsigned int size) |
| 214 |
{ |
| 215 |
/* |
| 216 |
* Note that int32_t and int16_t need only be "at least" large enough |
| 217 |
* to contain a value of the specified size. On some systems, like |
| 218 |
* Crays, there is no such thing as an integer variable with 16 bits. |
| 219 |
* Keep this in mind if you think this function should have been coded |
| 220 |
* to use pointer overlays. All the world's not a VAX. |
| 221 |
*/ |
| 222 |
char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; |
| 223 |
struct { |
| 224 |
int base, len; |
| 225 |
} best, cur; |
| 226 |
u_int words[IN6ADDRSZ / INT16SZ]; |
| 227 |
int i; |
| 228 |
|
| 229 |
/* |
| 230 |
* Preprocess: |
| 231 |
* Copy the input (bytewise) array into a wordwise array. |
| 232 |
* Find the longest run of 0x00's in src[] for :: shorthanding. |
| 233 |
*/ |
| 234 |
memset(words, '\0', sizeof words); |
| 235 |
for (i = 0; i < IN6ADDRSZ; i += 2) |
| 236 |
words[i / 2] = (src[i] << 8) | src[i + 1]; |
| 237 |
best.base = -1; |
| 238 |
cur.base = -1; |
| 239 |
for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) { |
| 240 |
if (words[i] == 0) { |
| 241 |
if (cur.base == -1) |
| 242 |
cur.base = i, cur.len = 1; |
| 243 |
else |
| 244 |
cur.len++; |
| 245 |
} else { |
| 246 |
if (cur.base != -1) { |
| 247 |
if (best.base == -1 || cur.len > best.len) |
| 248 |
best = cur; |
| 249 |
cur.base = -1; |
| 250 |
} |
| 251 |
} |
| 252 |
} |
| 253 |
if (cur.base != -1) { |
| 254 |
if (best.base == -1 || cur.len > best.len) |
| 255 |
best = cur; |
| 256 |
} |
| 257 |
if (best.base != -1 && best.len < 2) |
| 258 |
best.base = -1; |
| 259 |
|
| 260 |
/* |
| 261 |
* Format the result. |
| 262 |
*/ |
| 263 |
tp = tmp; |
| 264 |
for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) { |
| 265 |
/* Are we inside the best run of 0x00's? */ |
| 266 |
if (best.base != -1 && i >= best.base && i < (best.base + best.len)) { |
| 267 |
if (i == best.base) |
| 268 |
*tp++ = ':'; |
| 269 |
continue; |
| 270 |
} |
| 271 |
/* Are we following an initial run of 0x00s or any real hex? */ |
| 272 |
if (i != 0) |
| 273 |
*tp++ = ':'; |
| 274 |
/* Is this address an encapsulated IPv4? */ |
| 275 |
if (i == 6 && best.base == 0 && (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { |
| 276 |
if (!inet_ntop4(src + 12, tp, sizeof tmp - (tp - tmp))) |
| 277 |
return (NULL); |
| 278 |
tp += strlen(tp); |
| 279 |
break; |
| 280 |
} |
| 281 |
tp += sprintf(tp, "%x", words[i]); |
| 282 |
} |
| 283 |
/* Was it a trailing run of 0x00's? */ |
| 284 |
if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ)) |
| 285 |
*tp++ = ':'; |
| 286 |
|
| 287 |
*tp++ = '\0'; |
| 288 |
|
| 289 |
/* |
| 290 |
* Check for overflow, copy, and we're done. |
| 291 |
*/ |
| 292 |
|
| 293 |
if ((tp - tmp) > size) { |
| 294 |
return (NULL); |
| 295 |
} |
| 296 |
return strcpy(dst, tmp); |
| 297 |
} |
| 298 |
#endif |
| 299 |
|
| 300 |
#if 0 |
| 301 |
|
| 302 |
/* |
| 303 |
* This code doesn't seem to be used anywhere currently? |
| 304 |
* -grifferz |
| 305 |
*/ |
| 306 |
|
| 307 |
/* char * |
| 308 |
* inetntop(af, src, dst, size) |
| 309 |
* convert a network format address to presentation format. |
| 310 |
* return: |
| 311 |
* pointer to presentation format address (`dst'), or NULL (see errno). |
| 312 |
* author: |
| 313 |
* Paul Vixie, 1996. |
| 314 |
*/ |
| 315 |
const char *inetntop(int af, const void *src, char *dst, unsigned int size) |
| 316 |
{ |
| 317 |
switch (af) { |
| 318 |
case AF_INET: |
| 319 |
return (inet_ntop4(src, dst, size)); |
| 320 |
#ifdef IPV6 |
| 321 |
case AF_INET6: |
| 322 |
if (IN6_IS_ADDR_V4MAPPED((const struct in6_addr *) src) || |
| 323 |
IN6_IS_ADDR_V4COMPAT((const struct in6_addr *) src)) |
| 324 |
return (inet_ntop4 |
| 325 |
((unsigned char *) &((struct in6_addr *) src)->s6_addr[12], dst, size)); |
| 326 |
else |
| 327 |
return (inet_ntop6(src, dst, size)); |
| 328 |
|
| 329 |
#endif |
| 330 |
default: |
| 331 |
return (NULL); |
| 332 |
} |
| 333 |
/* NOTREACHED */ |
| 334 |
} |
| 335 |
#endif |
| 336 |
|
| 337 |
/* |
| 338 |
* WARNING: Don't even consider trying to compile this on a system where |
| 339 |
* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. |
| 340 |
*/ |
| 341 |
|
| 342 |
/* int |
| 343 |
* inet_pton(af, src, dst) |
| 344 |
* convert from presentation format (which usually means ASCII printable) |
| 345 |
* to network format (which is usually some kind of binary format). |
| 346 |
* return: |
| 347 |
* 1 if the address was valid for the specified address family |
| 348 |
* 0 if the address wasn't valid (`dst' is untouched in this case) |
| 349 |
* -1 if some other error occurred (`dst' is untouched in this case, too) |
| 350 |
* author: |
| 351 |
* Paul Vixie, 1996. |
| 352 |
*/ |
| 353 |
|
| 354 |
/* int |
| 355 |
* inet_pton4(src, dst) |
| 356 |
* like inet_aton() but without all the hexadecimal and shorthand. |
| 357 |
* return: |
| 358 |
* 1 if `src' is a valid dotted quad, else 0. |
| 359 |
* notice: |
| 360 |
* does not touch `dst' unless it's returning 1. |
| 361 |
* author: |
| 362 |
* Paul Vixie, 1996. |
| 363 |
*/ |
| 364 |
|
| 365 |
#ifndef HAVE_INET_PTON |
| 366 |
|
| 367 |
static int inet_pton4(src, dst) |
| 368 |
const char *src; |
| 369 |
unsigned char *dst; |
| 370 |
{ |
| 371 |
int saw_digit, octets, ch; |
| 372 |
unsigned char tmp[INADDRSZ], *tp; |
| 373 |
|
| 374 |
saw_digit = 0; |
| 375 |
octets = 0; |
| 376 |
*(tp = tmp) = 0; |
| 377 |
while ((ch = *src++) != '\0') { |
| 378 |
|
| 379 |
if (ch >= '0' && ch <= '9') { |
| 380 |
unsigned int new = *tp * 10 + (ch - '0'); |
| 381 |
|
| 382 |
if (new > 255) |
| 383 |
return (0); |
| 384 |
*tp = new; |
| 385 |
if (!saw_digit) { |
| 386 |
if (++octets > 4) |
| 387 |
return (0); |
| 388 |
saw_digit = 1; |
| 389 |
} |
| 390 |
} else if (ch == '.' && saw_digit) { |
| 391 |
if (octets == 4) |
| 392 |
return (0); |
| 393 |
*++tp = 0; |
| 394 |
saw_digit = 0; |
| 395 |
} else |
| 396 |
return (0); |
| 397 |
} |
| 398 |
if (octets < 4) |
| 399 |
return (0); |
| 400 |
memcpy(dst, tmp, INADDRSZ); |
| 401 |
return (1); |
| 402 |
} |
| 403 |
|
| 404 |
#ifdef IPV6 |
| 405 |
/* int |
| 406 |
* inet_pton6(src, dst) |
| 407 |
* convert presentation level address to network order binary form. |
| 408 |
* return: |
| 409 |
* 1 if `src' is a valid [RFC1884 2.2] address, else 0. |
| 410 |
* notice: |
| 411 |
* (1) does not touch `dst' unless it's returning 1. |
| 412 |
* (2) :: in a full address is silently ignored. |
| 413 |
* credit: |
| 414 |
* inspired by Mark Andrews. |
| 415 |
* author: |
| 416 |
* Paul Vixie, 1996. |
| 417 |
*/ |
| 418 |
|
| 419 |
static int inet_pton6(src, dst) |
| 420 |
const char *src; |
| 421 |
unsigned char *dst; |
| 422 |
{ |
| 423 |
static const char xdigits[] = "0123456789abcdef"; |
| 424 |
unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp; |
| 425 |
const char *curtok; |
| 426 |
int ch, saw_xdigit; |
| 427 |
unsigned int val; |
| 428 |
|
| 429 |
tp = memset(tmp, '\0', IN6ADDRSZ); |
| 430 |
endp = tp + IN6ADDRSZ; |
| 431 |
colonp = NULL; |
| 432 |
/* Leading :: requires some special handling. */ |
| 433 |
if (*src == ':') |
| 434 |
if (*++src != ':') |
| 435 |
return (0); |
| 436 |
curtok = src; |
| 437 |
saw_xdigit = 0; |
| 438 |
val = 0; |
| 439 |
while ((ch = ToLower(*src++)) != '\0') { |
| 440 |
const char *pch; |
| 441 |
|
| 442 |
pch = strchr(xdigits, ch); |
| 443 |
if (pch != NULL) { |
| 444 |
val <<= 4; |
| 445 |
val |= (pch - xdigits); |
| 446 |
if (val > 0xffff) |
| 447 |
return (0); |
| 448 |
saw_xdigit = 1; |
| 449 |
continue; |
| 450 |
} |
| 451 |
if (ch == ':') { |
| 452 |
curtok = src; |
| 453 |
if (!saw_xdigit) { |
| 454 |
if (colonp) |
| 455 |
return (0); |
| 456 |
colonp = tp; |
| 457 |
continue; |
| 458 |
} else if (*src == '\0') { |
| 459 |
return (0); |
| 460 |
} |
| 461 |
if (tp + INT16SZ > endp) |
| 462 |
return (0); |
| 463 |
*tp++ = (unsigned char) (val >> 8) & 0xff; |
| 464 |
*tp++ = (unsigned char) val & 0xff; |
| 465 |
saw_xdigit = 0; |
| 466 |
val = 0; |
| 467 |
continue; |
| 468 |
} |
| 469 |
|
| 470 |
if (*src != '\0' && ch == '.') { |
| 471 |
if (((tp + INADDRSZ) <= endp) && inet_pton4(curtok, tp) > 0) { |
| 472 |
tp += INADDRSZ; |
| 473 |
saw_xdigit = 0; |
| 474 |
break; /* '\0' was seen by inet_pton4(). */ |
| 475 |
} |
| 476 |
} else |
| 477 |
continue; |
| 478 |
return (0); |
| 479 |
} |
| 480 |
if (saw_xdigit) { |
| 481 |
if (tp + INT16SZ > endp) |
| 482 |
return (0); |
| 483 |
*tp++ = (unsigned char) (val >> 8) & 0xff; |
| 484 |
*tp++ = (unsigned char) val & 0xff; |
| 485 |
} |
| 486 |
if (colonp != NULL) { |
| 487 |
/* |
| 488 |
* Since some memmove()'s erroneously fail to handle |
| 489 |
* overlapping regions, we'll do the shift by hand. |
| 490 |
*/ |
| 491 |
const int n = tp - colonp; |
| 492 |
int i; |
| 493 |
|
| 494 |
if (tp == endp) |
| 495 |
return (0); |
| 496 |
for (i = 1; i <= n; i++) { |
| 497 |
endp[-i] = colonp[n - i]; |
| 498 |
colonp[n - i] = 0; |
| 499 |
} |
| 500 |
tp = endp; |
| 501 |
} |
| 502 |
if (tp != endp) |
| 503 |
return (0); |
| 504 |
memcpy(dst, tmp, IN6ADDRSZ); |
| 505 |
return (1); |
| 506 |
} |
| 507 |
#endif /* IPv6 */ |
| 508 |
|
| 509 |
int inet_pton(af, src, dst) |
| 510 |
int af; |
| 511 |
const char *src; |
| 512 |
void *dst; |
| 513 |
{ |
| 514 |
switch (af) { |
| 515 |
case AF_INET: |
| 516 |
return (inet_pton4(src, dst)); |
| 517 |
#ifdef IPV6 |
| 518 |
case AF_INET6: |
| 519 |
/* Somebody might have passed as an IPv4 address this is sick but it works */ |
| 520 |
if (inet_pton4(src, dst)) { |
| 521 |
char tmp[HOSTIPLEN]; |
| 522 |
sprintf(tmp, "::ffff:%s", src); |
| 523 |
return (inet_pton6(tmp, dst)); |
| 524 |
} else |
| 525 |
return (inet_pton6(src, dst)); |
| 526 |
#endif /* IPv6 */ |
| 527 |
default: |
| 528 |
return (-1); |
| 529 |
} |
| 530 |
/* NOTREACHED */ |
| 531 |
} |
| 532 |
|
| 533 |
#endif |
