2 * Copyright (C) 2004, 2005, 2008 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1996, 1998, 1999, 2001, 2003 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or 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.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: inet_net_pton.c,v 1.10 2008/11/14 02:36:51 marka Exp $";
21 #include <sys/cdefs.h>
22 __FBSDID("$FreeBSD$");
24 #include "port_before.h"
26 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <netinet/in.h>
29 #include <arpa/nameser.h>
30 #include <arpa/inet.h>
39 #include "port_after.h"
42 # define SPRINTF(x) strlen(sprintf/**/x)
44 # define SPRINTF(x) ((size_t)sprintf x)
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 * Paul Vixie (ISC), June 1996
64 inet_net_pton_ipv4(const char *src, u_char *dst, size_t size) {
65 static const char xdigits[] = "0123456789abcdef";
66 static const char digits[] = "0123456789";
67 int n, ch, tmp = 0, dirty, bits;
68 const u_char *odst = dst;
71 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
72 && isascii((unsigned char)(src[1]))
73 && isxdigit((unsigned char)(src[1]))) {
74 /* Hexadecimal: Eat nybble string. */
78 src++; /*%< skip x or X. */
79 while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch)) {
82 n = strchr(xdigits, ch) - xdigits;
83 assert(n >= 0 && n <= 15);
91 *dst++ = (u_char) tmp;
95 if (dirty) { /*%< Odd trailing nybble? */
98 *dst++ = (u_char) (tmp << 4);
100 } else if (isascii(ch) && isdigit(ch)) {
101 /* Decimal: eat dotted digit string. */
105 n = strchr(digits, ch) - digits;
106 assert(n >= 0 && n <= 9);
111 } while ((ch = *src++) != '\0' &&
112 isascii(ch) && isdigit(ch));
115 *dst++ = (u_char) tmp;
116 if (ch == '\0' || ch == '/')
121 if (!isascii(ch) || !isdigit(ch))
128 if (ch == '/' && isascii((unsigned char)(src[0])) &&
129 isdigit((unsigned char)(src[0])) && dst > odst) {
130 /* CIDR width specifier. Nothing can follow it. */
131 ch = *src++; /*%< Skip over the /. */
134 n = strchr(digits, ch) - digits;
135 assert(n >= 0 && n <= 9);
140 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
145 /* Firey death and destruction unless we prefetched EOS. */
149 /* If nothing was written to the destination, we found no address. */
152 /* If no CIDR spec was given, infer width from net class. */
154 if (*odst >= 240) /*%< Class E */
156 else if (*odst >= 224) /*%< Class D */
158 else if (*odst >= 192) /*%< Class C */
160 else if (*odst >= 128) /*%< Class B */
164 /* If imputed mask is narrower than specified octets, widen. */
165 if (bits < ((dst - odst) * 8))
166 bits = (dst - odst) * 8;
168 * If there are no additional bits specified for a class D
169 * address adjust bits to 4.
171 if (bits == 8 && *odst == 224)
174 /* Extend network to cover the actual mask. */
175 while (bits > ((dst - odst) * 8)) {
192 getbits(const char *src, int *bitsp) {
193 static const char digits[] = "0123456789";
200 while ((ch = *src++) != '\0') {
203 pch = strchr(digits, ch);
205 if (n++ != 0 && val == 0) /*%< no leading zeros */
208 val += (pch - digits);
209 if (val > 128) /*%< range */
222 getv4(const char *src, u_char *dst, int *bitsp) {
223 static const char digits[] = "0123456789";
231 while ((ch = *src++) != '\0') {
234 pch = strchr(digits, ch);
236 if (n++ != 0 && val == 0) /*%< no leading zeros */
239 val += (pch - digits);
240 if (val > 255) /*%< range */
244 if (ch == '.' || ch == '/') {
245 if (dst - odst > 3) /*%< too many octets? */
249 return (getbits(src, bitsp));
258 if (dst - odst > 3) /*%< too many octets? */
265 inet_net_pton_ipv6(const char *src, u_char *dst, size_t size) {
266 static const char xdigits_l[] = "0123456789abcdef",
267 xdigits_u[] = "0123456789ABCDEF";
268 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
269 const char *xdigits, *curtok;
278 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
279 endp = tp + NS_IN6ADDRSZ;
281 /* Leading :: requires some special handling. */
291 while ((ch = *src++) != '\0') {
294 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
295 pch = strchr((xdigits = xdigits_u), ch);
298 val |= (pch - xdigits);
311 } else if (*src == '\0')
313 if (tp + NS_INT16SZ > endp)
315 *tp++ = (u_char) (val >> 8) & 0xff;
316 *tp++ = (u_char) val & 0xff;
322 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
323 getv4(curtok, tp, &bits) > 0) {
327 break; /*%< '\\0' was seen by inet_pton4(). */
329 if (ch == '/' && getbits(src, &bits) > 0)
334 if (tp + NS_INT16SZ > endp)
336 *tp++ = (u_char) (val >> 8) & 0xff;
337 *tp++ = (u_char) val & 0xff;
342 words = (bits + 15) / 16;
347 endp = tmp + 2 * words;
349 if (colonp != NULL) {
351 * Since some memmove()'s erroneously fail to handle
352 * overlapping regions, we'll do the shift by hand.
354 const int n = tp - colonp;
359 for (i = 1; i <= n; i++) {
360 endp[- i] = colonp[n - i];
368 bytes = (bits + 7) / 8;
371 memcpy(dst, tmp, bytes);
385 * inet_net_pton(af, src, dst, size)
386 * convert network number from presentation to network format.
387 * accepts hex octets, hex strings, decimal octets, and /CIDR.
388 * "size" is in bytes and describes "dst".
390 * number of bits, either imputed classfully or specified with /CIDR,
391 * or -1 if some failure occurred (check errno). ENOENT means it was
392 * not a valid network specification.
394 * Paul Vixie (ISC), June 1996
397 inet_net_pton(int af, const char *src, void *dst, size_t size) {
400 return (inet_net_pton_ipv4(src, dst, size));
402 return (inet_net_pton_ipv6(src, dst, size));
404 errno = EAFNOSUPPORT;
410 * Weak aliases for applications that use certain private entry points,
411 * and fail to include <arpa/inet.h>.
414 __weak_reference(__inet_net_pton, inet_net_pton);