2 * Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1996-2003 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 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.
20 #if defined(LIBC_SCCS) && !defined(lint)
22 "$Id: inet_pton.c,v 1.13.18.4 2005/04/29 00:16:46 marka Exp $";
23 #endif /* LIBC_SCCS and not lint */
34 /*% IPv4 Address Size */
36 /*% IPv6 Address Size */
37 #define NS_IN6ADDRSZ 16
40 * WARNING: Don't even consider trying to compile this on a system where
41 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
44 static int inet_pton4(const char *src, unsigned char *dst);
45 static int inet_pton6(const char *src, unsigned char *dst);
48 * convert from presentation format (which usually means ASCII printable)
49 * to network format (which is usually some kind of binary format).
51 * 1 if the address was valid for the specified address family
52 * 0 if the address wasn't valid (`dst' is untouched in this case)
53 * -1 if some other error occurred (`dst' is untouched in this case, too)
58 isc_net_pton(int af, const char *src, void *dst) {
61 return (inet_pton4(src, dst));
63 return (inet_pton6(src, dst));
71 /*!\fn static int inet_pton4(const char *src, unsigned char *dst)
73 * like inet_aton() but without all the hexadecimal and shorthand.
75 * 1 if `src' is a valid dotted quad, else 0.
77 * does not touch `dst' unless it's returning 1.
82 inet_pton4(const char *src, unsigned char *dst) {
83 static const char digits[] = "0123456789";
84 int saw_digit, octets, ch;
85 unsigned char tmp[NS_INADDRSZ], *tp;
90 while ((ch = *src++) != '\0') {
93 if ((pch = strchr(digits, ch)) != NULL) {
94 unsigned int new = *tp * 10 + (pch - digits);
96 if (saw_digit && *tp == 0)
106 } else if (ch == '.' && saw_digit) {
116 memcpy(dst, tmp, NS_INADDRSZ);
121 * convert presentation level address to network order binary form.
123 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
125 * (1) does not touch `dst' unless it's returning 1.
127 * (2) :: in a full address is silently ignored.
129 * inspired by Mark Andrews.
134 inet_pton6(const char *src, unsigned char *dst) {
135 static const char xdigits_l[] = "0123456789abcdef",
136 xdigits_u[] = "0123456789ABCDEF";
137 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
138 const char *xdigits, *curtok;
139 int ch, seen_xdigits;
142 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
143 endp = tp + NS_IN6ADDRSZ;
145 /* Leading :: requires some special handling. */
152 while ((ch = *src++) != '\0') {
155 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
156 pch = strchr((xdigits = xdigits_u), ch);
159 val |= (pch - xdigits);
160 if (++seen_xdigits > 4)
172 if (tp + NS_INT16SZ > endp)
174 *tp++ = (unsigned char) (val >> 8) & 0xff;
175 *tp++ = (unsigned char) val & 0xff;
180 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
181 inet_pton4(curtok, tp) > 0) {
184 break; /* '\0' was seen by inet_pton4(). */
189 if (tp + NS_INT16SZ > endp)
191 *tp++ = (unsigned char) (val >> 8) & 0xff;
192 *tp++ = (unsigned char) val & 0xff;
194 if (colonp != NULL) {
196 * Since some memmove()'s erroneously fail to handle
197 * overlapping regions, we'll do the shift by hand.
199 const int n = tp - colonp;
204 for (i = 1; i <= n; i++) {
205 endp[- i] = colonp[n - i];
212 memcpy(dst, tmp, NS_IN6ADDRSZ);