Line data Source code
1 : /*
2 : * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 : * Copyright (c) 1996,1999 by Internet Software Consortium.
4 : *
5 : * Permission to use, copy, modify, and distribute this software for any
6 : * purpose with or without fee is hereby granted, provided that the above
7 : * copyright notice and this permission notice appear in all copies.
8 : *
9 : * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 : * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 : * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 : * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 : * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 : * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 : * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 : *
17 : * src/backend/utils/adt/inet_net_pton.c
18 : */
19 :
20 : #if defined(LIBC_SCCS) && !defined(lint)
21 : static const char rcsid[] = "Id: inet_net_pton.c,v 1.4.2.3 2004/03/17 00:40:11 marka Exp $";
22 : #endif
23 :
24 : #include "postgres.h"
25 :
26 : #include <sys/socket.h>
27 : #include <netinet/in.h>
28 : #include <arpa/inet.h>
29 : #include <assert.h>
30 : #include <ctype.h>
31 :
32 : #include "utils/builtins.h" /* needed on some platforms */
33 : #include "utils/inet.h"
34 :
35 :
36 : static int inet_net_pton_ipv4(const char *src, u_char *dst);
37 : static int inet_cidr_pton_ipv4(const char *src, u_char *dst, size_t size);
38 : static int inet_net_pton_ipv6(const char *src, u_char *dst);
39 : static int inet_cidr_pton_ipv6(const char *src, u_char *dst, size_t size);
40 :
41 :
42 : /*
43 : * int
44 : * pg_inet_net_pton(af, src, dst, size)
45 : * convert network number from presentation to network format.
46 : * accepts hex octets, hex strings, decimal octets, and /CIDR.
47 : * "size" is in bytes and describes "dst".
48 : * return:
49 : * number of bits, either imputed classfully or specified with /CIDR,
50 : * or -1 if some failure occurred (check errno). ENOENT means it was
51 : * not a valid network specification.
52 : * author:
53 : * Paul Vixie (ISC), June 1996
54 : *
55 : * Changes:
56 : * I added the inet_cidr_pton function (also from Paul) and changed
57 : * the names to reflect their current use.
58 : *
59 : */
60 : int
61 3147 : pg_inet_net_pton(int af, const char *src, void *dst, size_t size)
62 : {
63 3147 : switch (af)
64 : {
65 2513 : case PGSQL_AF_INET:
66 : return size == -1 ?
67 3362 : inet_net_pton_ipv4(src, dst) :
68 849 : inet_cidr_pton_ipv4(src, dst, size);
69 634 : case PGSQL_AF_INET6:
70 : return size == -1 ?
71 850 : inet_net_pton_ipv6(src, dst) :
72 216 : inet_cidr_pton_ipv6(src, dst, size);
73 0 : default:
74 0 : errno = EAFNOSUPPORT;
75 0 : return -1;
76 : }
77 : }
78 :
79 : /*
80 : * static int
81 : * inet_cidr_pton_ipv4(src, dst, size)
82 : * convert IPv4 network number from presentation to network format.
83 : * accepts hex octets, hex strings, decimal octets, and /CIDR.
84 : * "size" is in bytes and describes "dst".
85 : * return:
86 : * number of bits, either imputed classfully or specified with /CIDR,
87 : * or -1 if some failure occurred (check errno). ENOENT means it was
88 : * not an IPv4 network specification.
89 : * note:
90 : * network byte order assumed. this means 192.5.5.240/28 has
91 : * 0b11110000 in its fourth octet.
92 : * author:
93 : * Paul Vixie (ISC), June 1996
94 : */
95 : static int
96 849 : inet_cidr_pton_ipv4(const char *src, u_char *dst, size_t size)
97 : {
98 : static const char xdigits[] = "0123456789abcdef";
99 : static const char digits[] = "0123456789";
100 : int n,
101 : ch,
102 849 : tmp = 0,
103 : dirty,
104 : bits;
105 849 : const u_char *odst = dst;
106 :
107 849 : ch = *src++;
108 849 : if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
109 0 : && isxdigit((unsigned char) src[1]))
110 : {
111 : /* Hexadecimal: Eat nybble string. */
112 0 : if (size <= 0U)
113 0 : goto emsgsize;
114 0 : dirty = 0;
115 0 : src++; /* skip x or X. */
116 0 : while ((ch = *src++) != '\0' && isxdigit((unsigned char) ch))
117 : {
118 0 : ch = pg_ascii_tolower((unsigned char) ch);
119 0 : n = strchr(xdigits, ch) - xdigits;
120 0 : assert(n >= 0 && n <= 15);
121 0 : if (dirty == 0)
122 0 : tmp = n;
123 : else
124 0 : tmp = (tmp << 4) | n;
125 0 : if (++dirty == 2)
126 : {
127 0 : if (size-- <= 0U)
128 0 : goto emsgsize;
129 0 : *dst++ = (u_char) tmp;
130 0 : dirty = 0;
131 : }
132 : }
133 0 : if (dirty)
134 : { /* Odd trailing nybble? */
135 0 : if (size-- <= 0U)
136 0 : goto emsgsize;
137 0 : *dst++ = (u_char) (tmp << 4);
138 : }
139 : }
140 849 : else if (isdigit((unsigned char) ch))
141 : {
142 : /* Decimal: eat dotted digit string. */
143 : for (;;)
144 : {
145 2856 : tmp = 0;
146 : do
147 : {
148 5338 : n = strchr(digits, ch) - digits;
149 5338 : assert(n >= 0 && n <= 9);
150 5338 : tmp *= 10;
151 5338 : tmp += n;
152 5338 : if (tmp > 255)
153 8 : goto enoent;
154 5330 : } while ((ch = *src++) != '\0' &&
155 5002 : isdigit((unsigned char) ch));
156 2848 : if (size-- <= 0U)
157 0 : goto emsgsize;
158 2848 : *dst++ = (u_char) tmp;
159 2848 : if (ch == '\0' || ch == '/')
160 : break;
161 2007 : if (ch != '.')
162 0 : goto enoent;
163 2007 : ch = *src++;
164 2007 : if (!isdigit((unsigned char) ch))
165 0 : goto enoent;
166 : }
167 : }
168 : else
169 0 : goto enoent;
170 :
171 841 : bits = -1;
172 841 : if (ch == '/' && isdigit((unsigned char) src[0]) && dst > odst)
173 : {
174 : /* CIDR width specifier. Nothing can follow it. */
175 513 : ch = *src++; /* Skip over the /. */
176 513 : bits = 0;
177 : do
178 : {
179 894 : n = strchr(digits, ch) - digits;
180 894 : assert(n >= 0 && n <= 9);
181 894 : bits *= 10;
182 894 : bits += n;
183 894 : } while ((ch = *src++) != '\0' && isdigit((unsigned char) ch));
184 513 : if (ch != '\0')
185 0 : goto enoent;
186 513 : if (bits > 32)
187 0 : goto emsgsize;
188 : }
189 :
190 : /* Fiery death and destruction unless we prefetched EOS. */
191 841 : if (ch != '\0')
192 0 : goto enoent;
193 :
194 : /* If nothing was written to the destination, we found no address. */
195 841 : if (dst == odst)
196 0 : goto enoent;
197 : /* If no CIDR spec was given, infer width from net class. */
198 841 : if (bits == -1)
199 : {
200 328 : if (*odst >= 240) /* Class E */
201 128 : bits = 32;
202 200 : else if (*odst >= 224) /* Class D */
203 0 : bits = 8;
204 200 : else if (*odst >= 192) /* Class C */
205 20 : bits = 24;
206 180 : else if (*odst >= 128) /* Class B */
207 0 : bits = 16;
208 : else
209 : /* Class A */
210 180 : bits = 8;
211 : /* If imputed mask is narrower than specified octets, widen. */
212 328 : if (bits < ((dst - odst) * 8))
213 160 : bits = (dst - odst) * 8;
214 :
215 : /*
216 : * If there are no additional bits specified for a class D address
217 : * adjust bits to 4.
218 : */
219 328 : if (bits == 8 && *odst == 224)
220 0 : bits = 4;
221 : }
222 : /* Extend network to cover the actual mask. */
223 873 : while (bits > ((dst - odst) * 8))
224 : {
225 32 : if (size-- <= 0U)
226 0 : goto emsgsize;
227 32 : *dst++ = '\0';
228 : }
229 841 : return bits;
230 :
231 8 : enoent:
232 8 : errno = ENOENT;
233 8 : return -1;
234 :
235 0 : emsgsize:
236 0 : errno = EMSGSIZE;
237 0 : return -1;
238 : }
239 :
240 : /*
241 : * int
242 : * inet_net_pton_ipv4(af, src, dst, *bits)
243 : * convert network address from presentation to network format.
244 : * accepts inet_pton()'s input for this "af" plus trailing "/CIDR".
245 : * "dst" is assumed large enough for its "af". "bits" is set to the
246 : * /CIDR prefix length, which can have defaults (like /32 for IPv4).
247 : * return:
248 : * -1 if an error occurred (inspect errno; ENOENT means bad format).
249 : * 0 if successful conversion occurred.
250 : * note:
251 : * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
252 : * as called for by inet_cidr_pton() but it can be a host address with
253 : * an included netmask.
254 : * author:
255 : * Paul Vixie (ISC), October 1998
256 : */
257 : static int
258 1664 : inet_net_pton_ipv4(const char *src, u_char *dst)
259 : {
260 : static const char digits[] = "0123456789";
261 1664 : const u_char *odst = dst;
262 : int n,
263 : ch,
264 : tmp,
265 : bits;
266 1664 : size_t size = 4;
267 :
268 : /* Get the mantissa. */
269 6392 : while (ch = *src++, isdigit((unsigned char) ch))
270 : {
271 6392 : tmp = 0;
272 : do
273 : {
274 14025 : n = strchr(digits, ch) - digits;
275 14025 : assert(n >= 0 && n <= 9);
276 14025 : tmp *= 10;
277 14025 : tmp += n;
278 14025 : if (tmp > 255)
279 8 : goto enoent;
280 14017 : } while ((ch = *src++) != '\0' && isdigit((unsigned char) ch));
281 6384 : if (size-- == 0)
282 0 : goto emsgsize;
283 6384 : *dst++ = (u_char) tmp;
284 6384 : if (ch == '\0' || ch == '/')
285 : break;
286 4728 : if (ch != '.')
287 0 : goto enoent;
288 : }
289 :
290 : /* Get the prefix length if any. */
291 1656 : bits = -1;
292 1656 : if (ch == '/' && isdigit((unsigned char) src[0]) && dst > odst)
293 : {
294 : /* CIDR width specifier. Nothing can follow it. */
295 679 : ch = *src++; /* Skip over the /. */
296 679 : bits = 0;
297 : do
298 : {
299 1090 : n = strchr(digits, ch) - digits;
300 1090 : assert(n >= 0 && n <= 9);
301 1090 : bits *= 10;
302 1090 : bits += n;
303 1090 : } while ((ch = *src++) != '\0' && isdigit((unsigned char) ch));
304 679 : if (ch != '\0')
305 0 : goto enoent;
306 679 : if (bits > 32)
307 0 : goto emsgsize;
308 : }
309 :
310 : /* Fiery death and destruction unless we prefetched EOS. */
311 1656 : if (ch != '\0')
312 0 : goto enoent;
313 :
314 : /* Prefix length can default to /32 only if all four octets spec'd. */
315 1656 : if (bits == -1)
316 : {
317 977 : if (dst - odst == 4)
318 977 : bits = 32;
319 : else
320 0 : goto enoent;
321 : }
322 :
323 : /* If nothing was written to the destination, we found no address. */
324 1656 : if (dst == odst)
325 0 : goto enoent;
326 :
327 : /* If prefix length overspecifies mantissa, life is bad. */
328 1656 : if ((bits / 8) > (dst - odst))
329 0 : goto enoent;
330 :
331 : /* Extend address to four octets. */
332 1896 : while (size-- > 0)
333 240 : *dst++ = 0;
334 :
335 1656 : return bits;
336 :
337 8 : enoent:
338 8 : errno = ENOENT;
339 8 : return -1;
340 :
341 0 : emsgsize:
342 0 : errno = EMSGSIZE;
343 0 : return -1;
344 : }
345 :
346 : static int
347 354 : getbits(const char *src, int *bitsp)
348 : {
349 : static const char digits[] = "0123456789";
350 : int n;
351 : int val;
352 : char ch;
353 :
354 354 : val = 0;
355 354 : n = 0;
356 1088 : while ((ch = *src++) != '\0')
357 : {
358 : const char *pch;
359 :
360 734 : pch = strchr(digits, ch);
361 734 : if (pch != NULL)
362 : {
363 734 : if (n++ != 0 && val == 0) /* no leading zeros */
364 0 : return 0;
365 734 : val *= 10;
366 734 : val += (pch - digits);
367 734 : if (val > 128) /* range */
368 0 : return 0;
369 734 : continue;
370 : }
371 0 : return 0;
372 : }
373 354 : if (n == 0)
374 0 : return 0;
375 354 : *bitsp = val;
376 354 : return 1;
377 : }
378 :
379 : static int
380 24 : getv4(const char *src, u_char *dst, int *bitsp)
381 : {
382 : static const char digits[] = "0123456789";
383 24 : u_char *odst = dst;
384 : int n;
385 : u_int val;
386 : char ch;
387 :
388 24 : val = 0;
389 24 : n = 0;
390 192 : while ((ch = *src++) != '\0')
391 : {
392 : const char *pch;
393 :
394 188 : pch = strchr(digits, ch);
395 188 : if (pch != NULL)
396 : {
397 96 : if (n++ != 0 && val == 0) /* no leading zeros */
398 0 : return 0;
399 96 : val *= 10;
400 96 : val += (pch - digits);
401 96 : if (val > 255) /* range */
402 0 : return 0;
403 96 : continue;
404 : }
405 92 : if (ch == '.' || ch == '/')
406 : {
407 92 : if (dst - odst > 3) /* too many octets? */
408 0 : return 0;
409 92 : *dst++ = val;
410 92 : if (ch == '/')
411 20 : return getbits(src, bitsp);
412 72 : val = 0;
413 72 : n = 0;
414 72 : continue;
415 : }
416 0 : return 0;
417 : }
418 4 : if (n == 0)
419 0 : return 0;
420 4 : if (dst - odst > 3) /* too many octets? */
421 0 : return 0;
422 4 : *dst++ = val;
423 4 : return 1;
424 : }
425 :
426 : static int
427 418 : inet_net_pton_ipv6(const char *src, u_char *dst)
428 : {
429 418 : return inet_cidr_pton_ipv6(src, dst, 16);
430 : }
431 :
432 : #define NS_IN6ADDRSZ 16
433 : #define NS_INT16SZ 2
434 : #define NS_INADDRSZ 4
435 :
436 : static int
437 634 : inet_cidr_pton_ipv6(const char *src, u_char *dst, size_t size)
438 : {
439 : static const char xdigits_l[] = "0123456789abcdef",
440 : xdigits_u[] = "0123456789ABCDEF";
441 : u_char tmp[NS_IN6ADDRSZ],
442 : *tp,
443 : *endp,
444 : *colonp;
445 : const char *xdigits,
446 : *curtok;
447 : int ch,
448 : saw_xdigit;
449 : u_int val;
450 : int digits;
451 : int bits;
452 :
453 634 : if (size < NS_IN6ADDRSZ)
454 0 : goto emsgsize;
455 :
456 634 : memset((tp = tmp), '\0', NS_IN6ADDRSZ);
457 634 : endp = tp + NS_IN6ADDRSZ;
458 634 : colonp = NULL;
459 : /* Leading :: requires some special handling. */
460 634 : if (*src == ':')
461 44 : if (*++src != ':')
462 0 : goto enoent;
463 634 : curtok = src;
464 634 : saw_xdigit = 0;
465 634 : val = 0;
466 634 : digits = 0;
467 634 : bits = -1;
468 13562 : while ((ch = *src++) != '\0')
469 : {
470 : const char *pch;
471 :
472 13290 : if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
473 3168 : pch = strchr((xdigits = xdigits_u), ch);
474 13290 : if (pch != NULL)
475 : {
476 10122 : val <<= 4;
477 10122 : val |= (pch - xdigits);
478 10122 : if (++digits > 4)
479 0 : goto enoent;
480 10122 : saw_xdigit = 1;
481 10122 : continue;
482 : }
483 3168 : if (ch == ':')
484 : {
485 2810 : curtok = src;
486 2810 : if (!saw_xdigit)
487 : {
488 516 : if (colonp)
489 4 : goto enoent;
490 512 : colonp = tp;
491 512 : continue;
492 : }
493 2294 : else if (*src == '\0')
494 0 : goto enoent;
495 2294 : if (tp + NS_INT16SZ > endp)
496 0 : goto enoent;
497 2294 : *tp++ = (u_char) (val >> 8) & 0xff;
498 2294 : *tp++ = (u_char) val & 0xff;
499 2294 : saw_xdigit = 0;
500 2294 : digits = 0;
501 2294 : val = 0;
502 2294 : continue;
503 : }
504 382 : if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
505 24 : getv4(curtok, tp, &bits) > 0)
506 : {
507 24 : tp += NS_INADDRSZ;
508 24 : saw_xdigit = 0;
509 24 : break; /* '\0' was seen by inet_pton4(). */
510 : }
511 334 : if (ch == '/' && getbits(src, &bits) > 0)
512 334 : break;
513 0 : goto enoent;
514 : }
515 630 : if (saw_xdigit)
516 : {
517 526 : if (tp + NS_INT16SZ > endp)
518 0 : goto enoent;
519 526 : *tp++ = (u_char) (val >> 8) & 0xff;
520 526 : *tp++ = (u_char) val & 0xff;
521 : }
522 630 : if (bits == -1)
523 276 : bits = 128;
524 :
525 630 : endp = tmp + 16;
526 :
527 630 : if (colonp != NULL)
528 : {
529 : /*
530 : * Since some memmove()'s erroneously fail to handle overlapping
531 : * regions, we'll do the shift by hand.
532 : */
533 508 : const int n = tp - colonp;
534 : int i;
535 :
536 508 : if (tp == endp)
537 0 : goto enoent;
538 3156 : for (i = 1; i <= n; i++)
539 : {
540 2648 : endp[-i] = colonp[n - i];
541 2648 : colonp[n - i] = 0;
542 : }
543 508 : tp = endp;
544 : }
545 630 : if (tp != endp)
546 0 : goto enoent;
547 :
548 : /*
549 : * Copy out the result.
550 : */
551 630 : memcpy(dst, tmp, NS_IN6ADDRSZ);
552 :
553 630 : return bits;
554 :
555 4 : enoent:
556 4 : errno = ENOENT;
557 4 : return -1;
558 :
559 0 : emsgsize:
560 0 : errno = EMSGSIZE;
561 0 : return -1;
562 : }
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