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.
17 * $Id: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp $
20 #include "port_before.h"
21 #include <sys/param.h>
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
26 #include <arpa/nameser.h>
29 #include "port_after.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(const char *src, u_char *dst);
37 static int inet_pton6(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(int af, const char * __restrict src, void * __restrict dst)
55 return (inet_pton4(src, dst));
57 return (inet_pton6(src, dst));
66 * inet_pton4(src, dst)
67 * like inet_aton() but without all the hexadecimal and shorthand.
69 * 1 if `src' is a valid dotted quad, else 0.
71 * does not touch `dst' unless it's returning 1.
76 inet_pton4(const char *src, u_char *dst)
78 static const char digits[] = "0123456789";
79 int saw_digit, octets, ch;
80 u_char tmp[NS_INADDRSZ], *tp;
85 while ((ch = *src++) != '\0') {
88 if ((pch = strchr(digits, ch)) != NULL) {
89 u_int new = *tp * 10 + (pch - digits);
91 if (saw_digit && *tp == 0)
101 } else if (ch == '.' && saw_digit) {
111 memcpy(dst, tmp, NS_INADDRSZ);
116 * inet_pton6(src, dst)
117 * convert presentation level address to network order binary form.
119 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
121 * (1) does not touch `dst' unless it's returning 1.
122 * (2) :: in a full address is silently ignored.
124 * inspired by Mark Andrews.
129 inet_pton6(const char *src, u_char *dst)
131 static const char xdigits_l[] = "0123456789abcdef",
132 xdigits_u[] = "0123456789ABCDEF";
133 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
134 const char *xdigits, *curtok;
135 int ch, seen_xdigits;
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);
156 if (++seen_xdigits > 4)
167 } else if (*src == '\0') {
170 if (tp + NS_INT16SZ > endp)
172 *tp++ = (u_char) (val >> 8) & 0xff;
173 *tp++ = (u_char) val & 0xff;
178 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
179 inet_pton4(curtok, tp) > 0) {
182 break; /*%< '\\0' was seen by inet_pton4(). */
187 if (tp + NS_INT16SZ > endp)
189 *tp++ = (u_char) (val >> 8) & 0xff;
190 *tp++ = (u_char) val & 0xff;
192 if (colonp != NULL) {
194 * Since some memmove()'s erroneously fail to handle
195 * overlapping regions, we'll do the shift by hand.
197 const int n = tp - colonp;
202 for (i = 1; i <= n; i++) {
203 endp[- i] = colonp[n - i];
210 memcpy(dst, tmp, NS_IN6ADDRSZ);
215 * Weak aliases for applications that use certain private entry points,
216 * and fail to include <arpa/inet.h>.
219 __weak_reference(__inet_pton, inet_pton);