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
18 * $FreeBSD: src/lib/libc/net/inet_pton.c,v 1.6.2.1 2002/04/28 05:40:24 suz Exp $
19 * $DragonFly: src/lib/libcr/net/Attic/inet_pton.c,v 1.2 2003/06/17 04:26:44 dillon Exp $
22 #include <sys/param.h>
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
27 #include <arpa/nameser.h>
32 * WARNING: Don't even consider trying to compile this on a system where
33 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
36 static int inet_pton4 __P((const char *src, u_char *dst));
37 static int inet_pton6 __P((const char *src, u_char *dst));
40 * inet_pton(af, src, dst)
41 * convert from presentation format (which usually means ASCII printable)
42 * to network format (which is usually some kind of binary format).
44 * 1 if the address was valid for the specified address family
45 * 0 if the address wasn't valid (`dst' is untouched in this case)
46 * -1 if some other error occurred (`dst' is untouched in this case, too)
51 inet_pton(af, src, dst)
58 return (inet_pton4(src, dst));
60 return (inet_pton6(src, dst));
69 * inet_pton4(src, dst)
70 * like inet_aton() but without all the hexadecimal and shorthand.
72 * 1 if `src' is a valid dotted quad, else 0.
74 * does not touch `dst' unless it's returning 1.
83 static const char digits[] = "0123456789";
84 int saw_digit, octets, ch;
85 u_char tmp[NS_INADDRSZ], *tp;
90 while ((ch = *src++) != '\0') {
93 if ((pch = strchr(digits, ch)) != NULL) {
94 u_int new = *tp * 10 + (pch - digits);
104 } else if (ch == '.' && saw_digit) {
115 memcpy(dst, tmp, NS_INADDRSZ);
120 * inet_pton6(src, dst)
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.
126 * (2) :: in a full address is silently ignored.
128 * inspired by Mark Andrews.
137 static const char xdigits_l[] = "0123456789abcdef",
138 xdigits_u[] = "0123456789ABCDEF";
139 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
140 const char *xdigits, *curtok;
144 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
145 endp = tp + NS_IN6ADDRSZ;
147 /* Leading :: requires some special handling. */
154 while ((ch = *src++) != '\0') {
157 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
158 pch = strchr((xdigits = xdigits_u), ch);
161 val |= (pch - xdigits);
175 if (tp + NS_INT16SZ > endp)
177 *tp++ = (u_char) (val >> 8) & 0xff;
178 *tp++ = (u_char) val & 0xff;
183 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
184 inet_pton4(curtok, tp) > 0) {
187 break; /* '\0' was seen by inet_pton4(). */
192 if (tp + NS_INT16SZ > endp)
194 *tp++ = (u_char) (val >> 8) & 0xff;
195 *tp++ = (u_char) val & 0xff;
197 if (colonp != NULL) {
199 * Since some memmove()'s erroneously fail to handle
200 * overlapping regions, we'll do the shift by hand.
202 const int n = tp - colonp;
205 for (i = 1; i <= n; i++) {
206 endp[- i] = colonp[n - i];
213 memcpy(dst, tmp, NS_IN6ADDRSZ);
218 * Weak aliases for applications that use certain private entry points,
219 * and fail to include <arpa/inet.h>.
222 __weak_reference(__inet_pton, inet_pton);