2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996,1999 by Internet Software Consortium.
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.
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.
17 * $Id: inet_net_pton.c,v 1.8.672.1 2008/08/26 04:42:38 marka Exp $
20 #include "port_before.h"
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <arpa/nameser.h>
26 #include <arpa/inet.h>
35 #include "port_after.h"
39 * inet_net_pton_ipv4(src, dst, size)
40 * convert IPv4 network number from presentation to network format.
41 * accepts hex octets, hex strings, decimal octets, and /CIDR.
42 * "size" is in bytes and describes "dst".
44 * number of bits, either imputed classfully or specified with /CIDR,
45 * or -1 if some failure occurred (check errno). ENOENT means it was
46 * not an IPv4 network specification.
48 * network byte order assumed. this means 192.5.5.240/28 has
49 * 0b11110000 in its fourth octet.
51 * Paul Vixie (ISC), June 1996
54 inet_net_pton_ipv4(const char *src, u_char *dst, size_t size) {
55 static const char xdigits[] = "0123456789abcdef";
56 static const char digits[] = "0123456789";
57 int n, ch, tmp = 0, dirty, bits;
58 const u_char *odst = dst;
61 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
62 && isascii((unsigned char)(src[1]))
63 && isxdigit((unsigned char)(src[1]))) {
64 /* Hexadecimal: Eat nybble string. */
68 src++; /*%< skip x or X. */
69 while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch)) {
72 n = strchr(xdigits, ch) - xdigits;
73 assert(n >= 0 && n <= 15);
81 *dst++ = (u_char) tmp;
85 if (dirty) { /*%< Odd trailing nybble? */
88 *dst++ = (u_char) (tmp << 4);
90 } else if (isascii(ch) && isdigit(ch)) {
91 /* Decimal: eat dotted digit string. */
95 n = strchr(digits, ch) - digits;
96 assert(n >= 0 && n <= 9);
101 } while ((ch = *src++) != '\0' &&
102 isascii(ch) && isdigit(ch));
105 *dst++ = (u_char) tmp;
106 if (ch == '\0' || ch == '/')
111 if (!isascii(ch) || !isdigit(ch))
118 if (ch == '/' && isascii((unsigned char)(src[0])) &&
119 isdigit((unsigned char)(src[0])) && dst > odst) {
120 /* CIDR width specifier. Nothing can follow it. */
121 ch = *src++; /*%< Skip over the /. */
124 n = strchr(digits, ch) - digits;
125 assert(n >= 0 && n <= 9);
130 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
135 /* Firey death and destruction unless we prefetched EOS. */
139 /* If nothing was written to the destination, we found no address. */
142 /* If no CIDR spec was given, infer width from net class. */
144 if (*odst >= 240) /*%< Class E */
146 else if (*odst >= 224) /*%< Class D */
148 else if (*odst >= 192) /*%< Class C */
150 else if (*odst >= 128) /*%< Class B */
154 /* If imputed mask is narrower than specified octets, widen. */
155 if (bits < ((dst - odst) * 8))
156 bits = (dst - odst) * 8;
158 * If there are no additional bits specified for a class D
159 * address adjust bits to 4.
161 if (bits == 8 && *odst == 224)
164 /* Extend network to cover the actual mask. */
165 while (bits > ((dst - odst) * 8)) {
182 getbits(const char *src, int *bitsp) {
183 static const char digits[] = "0123456789";
190 while ((ch = *src++) != '\0') {
193 pch = strchr(digits, ch);
195 if (n++ != 0 && val == 0) /*%< no leading zeros */
198 val += (pch - digits);
199 if (val > 128) /*%< range */
212 getv4(const char *src, u_char *dst, int *bitsp) {
213 static const char digits[] = "0123456789";
221 while ((ch = *src++) != '\0') {
224 pch = strchr(digits, ch);
226 if (n++ != 0 && val == 0) /*%< no leading zeros */
229 val += (pch - digits);
230 if (val > 255) /*%< range */
234 if (ch == '.' || ch == '/') {
235 if (dst - odst > 3) /*%< too many octets? */
239 return (getbits(src, bitsp));
248 if (dst - odst > 3) /*%< too many octets? */
255 inet_net_pton_ipv6(const char *src, u_char *dst, size_t size) {
256 static const char xdigits_l[] = "0123456789abcdef",
257 xdigits_u[] = "0123456789ABCDEF";
258 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
259 const char *xdigits, *curtok;
268 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
269 endp = tp + NS_IN6ADDRSZ;
271 /* Leading :: requires some special handling. */
281 while ((ch = *src++) != '\0') {
284 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
285 pch = strchr((xdigits = xdigits_u), ch);
288 val |= (pch - xdigits);
301 } else if (*src == '\0')
303 if (tp + NS_INT16SZ > endp)
305 *tp++ = (u_char) (val >> 8) & 0xff;
306 *tp++ = (u_char) val & 0xff;
312 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
313 getv4(curtok, tp, &bits) > 0) {
317 break; /*%< '\\0' was seen by inet_pton4(). */
319 if (ch == '/' && getbits(src, &bits) > 0)
324 if (tp + NS_INT16SZ > endp)
326 *tp++ = (u_char) (val >> 8) & 0xff;
327 *tp++ = (u_char) val & 0xff;
332 words = (bits + 15) / 16;
337 endp = tmp + 2 * words;
339 if (colonp != NULL) {
341 * Since some memmove()'s erroneously fail to handle
342 * overlapping regions, we'll do the shift by hand.
344 const int n = tp - colonp;
349 for (i = 1; i <= n; i++) {
350 endp[- i] = colonp[n - i];
358 bytes = (bits + 7) / 8;
361 memcpy(dst, tmp, bytes);
375 * inet_net_pton(af, src, dst, size)
376 * convert network number from presentation to network format.
377 * accepts hex octets, hex strings, decimal octets, and /CIDR.
378 * "size" is in bytes and describes "dst".
380 * number of bits, either imputed classfully or specified with /CIDR,
381 * or -1 if some failure occurred (check errno). ENOENT means it was
382 * not a valid network specification.
384 * Paul Vixie (ISC), June 1996
387 inet_net_pton(int af, const char *src, void *dst, size_t size) {
390 return (inet_net_pton_ipv4(src, dst, size));
392 return (inet_net_pton_ipv6(src, dst, size));
394 errno = EAFNOSUPPORT;
400 * Weak aliases for applications that use certain private entry points,
401 * and fail to include <arpa/inet.h>.
404 __weak_reference(__inet_net_pton, inet_net_pton);