3 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
4 * Copyright (c) 1996,1999 by Internet Software Consortium.
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
16 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include "ares_setup.h"
21 #ifdef HAVE_NETINET_IN_H
22 # include <netinet/in.h>
24 #ifdef HAVE_ARPA_INET_H
25 # include <arpa/inet.h>
27 #ifdef HAVE_ARPA_NAMESER_H
28 # include <arpa/nameser.h>
32 #ifdef HAVE_ARPA_NAMESER_COMPAT_H
33 # include <arpa/nameser_compat.h>
37 #include "ares_ipv6.h"
38 #include "ares_nowarn.h"
39 #include "ares_inet_net_pton.h"
42 const struct ares_in6_addr ares_in6addr_any = { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } };
45 #ifndef HAVE_INET_NET_PTON
49 * inet_net_pton_ipv4(src, dst, size)
50 * convert IPv4 network number from presentation to network format.
51 * accepts hex octets, hex strings, decimal octets, and /CIDR.
52 * "size" is in bytes and describes "dst".
54 * number of bits, either imputed classfully or specified with /CIDR,
55 * or -1 if some failure occurred (check errno). ENOENT means it was
56 * not an IPv4 network specification.
58 * network byte order assumed. this means 192.5.5.240/28 has
59 * 0b11110000 in its fourth octet.
61 * On Windows we store the error in the thread errno, not
62 * in the winsock error code. This is to avoid loosing the
63 * actual last winsock error. So use macro ERRNO to fetch the
64 * errno this funtion sets when returning (-1), not SOCKERRNO.
66 * Paul Vixie (ISC), June 1996
69 inet_net_pton_ipv4(const char *src, unsigned char *dst, size_t size)
71 static const char xdigits[] = "0123456789abcdef";
72 static const char digits[] = "0123456789";
73 int n, ch, tmp = 0, dirty, bits;
74 const unsigned char *odst = dst;
77 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
79 && ISXDIGIT(src[1])) {
80 /* Hexadecimal: Eat nybble string. */
84 src++; /* skip x or X. */
85 while ((ch = *src++) != '\0' && ISASCII(ch) && ISXDIGIT(ch)) {
88 n = aresx_sztosi(strchr(xdigits, ch) - xdigits);
96 *dst++ = (unsigned char) tmp;
100 if (dirty) { /* Odd trailing nybble? */
103 *dst++ = (unsigned char) (tmp << 4);
105 } else if (ISASCII(ch) && ISDIGIT(ch)) {
106 /* Decimal: eat dotted digit string. */
110 n = aresx_sztosi(strchr(digits, ch) - digits);
115 } while ((ch = *src++) != '\0' &&
116 ISASCII(ch) && ISDIGIT(ch));
119 *dst++ = (unsigned char) tmp;
120 if (ch == '\0' || ch == '/')
125 if (!ISASCII(ch) || !ISDIGIT(ch))
132 if (ch == '/' && ISASCII(src[0]) &&
133 ISDIGIT(src[0]) && dst > odst) {
134 /* CIDR width specifier. Nothing can follow it. */
135 ch = *src++; /* Skip over the /. */
138 n = aresx_sztosi(strchr(digits, ch) - digits);
143 } while ((ch = *src++) != '\0' && ISASCII(ch) && ISDIGIT(ch));
148 /* Firey death and destruction unless we prefetched EOS. */
152 /* If nothing was written to the destination, we found no address. */
155 /* If no CIDR spec was given, infer width from net class. */
157 if (*odst >= 240) /* Class E */
159 else if (*odst >= 224) /* Class D */
161 else if (*odst >= 192) /* Class C */
163 else if (*odst >= 128) /* Class B */
167 /* If imputed mask is narrower than specified octets, widen. */
168 if (bits < ((dst - odst) * 8))
169 bits = aresx_sztosi(dst - odst) * 8;
171 * If there are no additional bits specified for a class D
172 * address adjust bits to 4.
174 if (bits == 8 && *odst == 224)
177 /* Extend network to cover the actual mask. */
178 while (bits > ((dst - odst) * 8)) {
195 getbits(const char *src, int *bitsp)
197 static const char digits[] = "0123456789";
204 while ((ch = *src++) != '\0') {
207 pch = strchr(digits, ch);
209 if (n++ != 0 && val == 0) /* no leading zeros */
212 val += aresx_sztosi(pch - digits);
213 if (val > 128) /* range */
226 getv4(const char *src, unsigned char *dst, int *bitsp)
228 static const char digits[] = "0123456789";
229 unsigned char *odst = dst;
236 while ((ch = *src++) != '\0') {
239 pch = strchr(digits, ch);
241 if (n++ != 0 && val == 0) /* no leading zeros */
244 val += aresx_sztoui(pch - digits);
245 if (val > 255) /* range */
249 if (ch == '.' || ch == '/') {
250 if (dst - odst > 3) /* too many octets? */
252 *dst++ = (unsigned char)val;
254 return (getbits(src, bitsp));
263 if (dst - odst > 3) /* too many octets? */
265 *dst = (unsigned char)val;
270 inet_net_pton_ipv6(const char *src, unsigned char *dst, size_t size)
272 static const char xdigits_l[] = "0123456789abcdef",
273 xdigits_u[] = "0123456789ABCDEF";
274 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
275 const char *xdigits, *curtok;
284 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
285 endp = tp + NS_IN6ADDRSZ;
287 /* Leading :: requires some special handling. */
297 while ((ch = *src++) != '\0') {
300 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
301 pch = strchr((xdigits = xdigits_u), ch);
304 val |= aresx_sztoui(pch - xdigits);
317 } else if (*src == '\0')
319 if (tp + NS_INT16SZ > endp)
321 *tp++ = (unsigned char)((val >> 8) & 0xff);
322 *tp++ = (unsigned char)(val & 0xff);
328 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
329 getv4(curtok, tp, &bits) > 0) {
333 break; /* '\0' was seen by inet_pton4(). */
335 if (ch == '/' && getbits(src, &bits) > 0)
340 if (tp + NS_INT16SZ > endp)
342 *tp++ = (unsigned char)((val >> 8) & 0xff);
343 *tp++ = (unsigned char)(val & 0xff);
348 words = (bits + 15) / 16;
353 endp = tmp + 2 * words;
355 if (colonp != NULL) {
357 * Since some memmove()'s erroneously fail to handle
358 * overlapping regions, we'll do the shift by hand.
360 const ssize_t n = tp - colonp;
365 for (i = 1; i <= n; i++) {
366 *(endp - i) = *(colonp + n - i);
367 *(colonp + n - i) = 0;
374 bytes = (bits + 7) / 8;
377 memcpy(dst, tmp, bytes);
391 * inet_net_pton(af, src, dst, size)
392 * convert network number from presentation to network format.
393 * accepts hex octets, hex strings, decimal octets, and /CIDR.
394 * "size" is in bytes and describes "dst".
396 * number of bits, either imputed classfully or specified with /CIDR,
397 * or -1 if some failure occurred (check errno). ENOENT means it was
398 * not a valid network specification.
400 * On Windows we store the error in the thread errno, not
401 * in the winsock error code. This is to avoid loosing the
402 * actual last winsock error. So use macro ERRNO to fetch the
403 * errno this funtion sets when returning (-1), not SOCKERRNO.
405 * Paul Vixie (ISC), June 1996
408 ares_inet_net_pton(int af, const char *src, void *dst, size_t size)
412 return (inet_net_pton_ipv4(src, dst, size));
414 return (inet_net_pton_ipv6(src, dst, size));
416 SET_ERRNO(EAFNOSUPPORT);
421 #endif /* HAVE_INET_NET_PTON */
423 #ifndef HAVE_INET_PTON
424 int ares_inet_pton(int af, const char *src, void *dst)
430 size = sizeof(struct in_addr);
431 else if (af == AF_INET6)
432 size = sizeof(struct ares_in6_addr);
435 SET_ERRNO(EAFNOSUPPORT);
438 result = ares_inet_net_pton(af, src, dst, size);
439 if (result == -1 && ERRNO == ENOENT)
441 return (result > -1 ? 1 : -1);
443 #else /* HAVE_INET_PTON */
444 int ares_inet_pton(int af, const char *src, void *dst)
446 /* just relay this to the underlying function */
447 return inet_pton(af, src, dst);