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.
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: inet_pton.c,v 1.2.206.2 2005/07/28 07:43:18 marka Exp $";
20 #endif /* LIBC_SCCS and not lint */
22 #include "port_before.h"
23 #include <sys/param.h>
24 #include <sys/types.h>
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <arpa/inet.h>
28 #include <arpa/nameser.h>
31 #include "port_after.h"
34 * WARNING: Don't even consider trying to compile this on a system where
35 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
38 static int inet_pton4 __P((const char *src, u_char *dst));
39 static int inet_pton6 __P((const char *src, u_char *dst));
42 * inet_pton(af, src, dst)
43 * convert from presentation format (which usually means ASCII printable)
44 * to network format (which is usually some kind of binary format).
46 * 1 if the address was valid for the specified address family
47 * 0 if the address wasn't valid (`dst' is untouched in this case)
48 * -1 if some other error occurred (`dst' is untouched in this case, too)
53 inet_pton(af, src, dst)
60 return (inet_pton4(src, dst));
62 return (inet_pton6(src, dst));
71 * inet_pton4(src, dst)
72 * like inet_aton() but without all the hexadecimal and shorthand.
74 * 1 if `src' is a valid dotted quad, else 0.
76 * does not touch `dst' unless it's returning 1.
85 static const char digits[] = "0123456789";
86 int saw_digit, octets, ch;
87 u_char tmp[NS_INADDRSZ], *tp;
92 while ((ch = *src++) != '\0') {
95 if ((pch = strchr(digits, ch)) != NULL) {
96 u_int new = *tp * 10 + (pch - digits);
98 if (saw_digit && *tp == 0)
108 } else if (ch == '.' && saw_digit) {
118 memcpy(dst, tmp, NS_INADDRSZ);
123 * inet_pton6(src, dst)
124 * convert presentation level address to network order binary form.
126 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
128 * (1) does not touch `dst' unless it's returning 1.
129 * (2) :: in a full address is silently ignored.
131 * inspired by Mark Andrews.
140 static const char xdigits_l[] = "0123456789abcdef",
141 xdigits_u[] = "0123456789ABCDEF";
142 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
143 const char *xdigits, *curtok;
144 int ch, seen_xdigits;
147 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
148 endp = tp + NS_IN6ADDRSZ;
150 /* Leading :: requires some special handling. */
157 while ((ch = *src++) != '\0') {
160 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
161 pch = strchr((xdigits = xdigits_u), ch);
164 val |= (pch - xdigits);
165 if (++seen_xdigits > 4)
176 } else if (*src == '\0') {
179 if (tp + NS_INT16SZ > endp)
181 *tp++ = (u_char) (val >> 8) & 0xff;
182 *tp++ = (u_char) val & 0xff;
187 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
188 inet_pton4(curtok, tp) > 0) {
191 break; /* '\0' was seen by inet_pton4(). */
196 if (tp + NS_INT16SZ > endp)
198 *tp++ = (u_char) (val >> 8) & 0xff;
199 *tp++ = (u_char) val & 0xff;
201 if (colonp != NULL) {
203 * Since some memmove()'s erroneously fail to handle
204 * overlapping regions, we'll do the shift by hand.
206 const int n = tp - colonp;
211 for (i = 1; i <= n; i++) {
212 endp[- i] = colonp[n - i];
219 memcpy(dst, tmp, NS_IN6ADDRSZ);