2 * Copyright (C) 2004 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.
18 #if defined(LIBC_SCCS) && !defined(lint)
20 "$Id: inet_pton.c,v 1.10.2.4.2.1 2004/03/06 08:14:31 marka Exp $";
21 #endif /* LIBC_SCCS and not lint */
32 #define NS_IN6ADDRSZ 16
35 * WARNING: Don't even consider trying to compile this on a system where
36 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
39 static int inet_pton4(const char *src, unsigned char *dst);
40 static int inet_pton6(const char *src, unsigned char *dst);
43 * isc_net_pton(af, src, dst)
44 * convert from presentation format (which usually means ASCII printable)
45 * to network format (which is usually some kind of binary format).
47 * 1 if the address was valid for the specified address family
48 * 0 if the address wasn't valid (`dst' is untouched in this case)
49 * -1 if some other error occurred (`dst' is untouched in this case, too)
54 isc_net_pton(int af, const char *src, void *dst) {
57 return (inet_pton4(src, dst));
59 return (inet_pton6(src, dst));
68 * inet_pton4(src, dst)
69 * like inet_aton() but without all the hexadecimal and shorthand.
71 * 1 if `src' is a valid dotted quad, else 0.
73 * does not touch `dst' unless it's returning 1.
78 inet_pton4(const char *src, unsigned char *dst) {
79 static const char digits[] = "0123456789";
80 int saw_digit, octets, ch;
81 unsigned char tmp[NS_INADDRSZ], *tp;
86 while ((ch = *src++) != '\0') {
89 if ((pch = strchr(digits, ch)) != NULL) {
90 unsigned int new = *tp * 10 + (pch - digits);
92 if (saw_digit && *tp == 0)
96 *tp = (unsigned char) new;
102 } else if (ch == '.' && saw_digit) {
112 memcpy(dst, tmp, NS_INADDRSZ);
117 * inet_pton6(src, dst)
118 * convert presentation level address to network order binary form.
120 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
122 * (1) does not touch `dst' unless it's returning 1.
123 * (2) :: in a full address is silently ignored.
125 * inspired by Mark Andrews.
130 inet_pton6(const char *src, unsigned char *dst) {
131 static const char xdigits_l[] = "0123456789abcdef",
132 xdigits_u[] = "0123456789ABCDEF";
133 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
134 const char *xdigits, *curtok;
138 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
139 endp = tp + NS_IN6ADDRSZ;
141 /* Leading :: requires some special handling. */
148 while ((ch = *src++) != '\0') {
151 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
152 pch = strchr((xdigits = xdigits_u), ch);
155 val |= (pch - xdigits);
169 if (tp + NS_INT16SZ > endp)
171 *tp++ = (unsigned char) ((val >> 8) & 0xff);
172 *tp++ = (unsigned char) (val & 0xff);
177 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
178 inet_pton4(curtok, tp) > 0) {
181 break; /* '\0' was seen by inet_pton4(). */
186 if (tp + NS_INT16SZ > endp)
188 *tp++ = (unsigned char) ((val >> 8) & 0xff);
189 *tp++ = (unsigned char) (val & 0xff);
191 if (colonp != NULL) {
193 * Since some memmove()'s erroneously fail to handle
194 * overlapping regions, we'll do the shift by hand.
196 const int n = tp - colonp;
201 for (i = 1; i <= n; i++) {
202 endp[- i] = colonp[n - i];
209 memcpy(dst, tmp, NS_IN6ADDRSZ);