1 /* $KAME: inet_pton.c,v 1.5 2001/08/20 02:32:40 itojun Exp $ */
3 /* Copyright (c) 1996 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
10 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
11 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
12 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
15 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
26 * WARNING: Don't even consider trying to compile this on a system where
27 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
30 static int inet_pton4 (const char *src, uint8_t *dst);
31 static int inet_pton6 (const char *src, uint8_t *dst);
35 * The definitions we might miss.
43 #define NS_IN6ADDRSZ 16
51 * inet_pton(af, src, dst)
52 * convert from presentation format (which usually means ASCII printable)
53 * to network format (which is usually some kind of binary format).
55 * 1 if the address was valid for the specified address family
56 * 0 if the address wasn't valid (`dst' is untouched in this case)
57 * -1 if some other error occurred (`dst' is untouched in this case, too)
62 inet_pton(af, src, dst)
69 return (inet_pton4(src, dst));
71 return (inet_pton6(src, dst));
84 * inet_pton4(src, dst)
85 * like inet_aton() but without all the hexadecimal and shorthand.
87 * 1 if `src' is a valid dotted quad, else 0.
89 * does not touch `dst' unless it's returning 1.
98 static const char digits[] = "0123456789";
99 int saw_digit, octets, ch;
100 uint8_t tmp[NS_INADDRSZ], *tp;
105 while ((ch = *src++) != '\0') {
108 if ((pch = strchr(digits, ch)) != NULL) {
109 uint32_t new = *tp * 10 + (pch - digits);
119 } else if (ch == '.' && saw_digit) {
130 memcpy(dst, tmp, NS_INADDRSZ);
135 * inet_pton6(src, dst)
136 * convert presentation level address to network order binary form.
138 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
140 * (1) does not touch `dst' unless it's returning 1.
141 * (2) :: in a full address is silently ignored.
143 * inspired by Mark Andrews.
152 static const char xdigits_l[] = "0123456789abcdef",
153 xdigits_u[] = "0123456789ABCDEF";
154 uint8_t tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
155 const char *xdigits, *curtok;
159 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
160 endp = tp + NS_IN6ADDRSZ;
162 /* Leading :: requires some special handling. */
169 while ((ch = *src++) != '\0') {
172 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
173 pch = strchr((xdigits = xdigits_u), ch);
176 val |= (pch - xdigits);
190 if (tp + NS_INT16SZ > endp)
192 *tp++ = (uint8_t) (val >> 8) & 0xff;
193 *tp++ = (uint8_t) val & 0xff;
198 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
199 inet_pton4(curtok, tp) > 0) {
202 break; /* '\0' was seen by inet_pton4(). */
207 if (tp + NS_INT16SZ > endp)
209 *tp++ = (uint8_t) (val >> 8) & 0xff;
210 *tp++ = (uint8_t) val & 0xff;
212 if (colonp != NULL) {
214 * Since some memmove()'s erroneously fail to handle
215 * overlapping regions, we'll do the shift by hand.
217 const int n = tp - colonp;
220 for (i = 1; i <= n; i++) {
221 endp[- i] = colonp[n - i];
228 memcpy(dst, tmp, NS_IN6ADDRSZ);