2 * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1996-2001 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or 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 /*! \file lwinetpton.c
21 #if defined(LIBC_SCCS) && !defined(lint)
22 static char rcsid[] = "$Id: lwinetpton.c,v 1.12 2007-06-19 23:47:22 tbox Exp $";
23 #endif /* LIBC_SCCS and not lint */
30 #include <lwres/net.h>
34 #define NS_IN6ADDRSZ 16
37 * WARNING: Don't even consider trying to compile this on a system where
38 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
41 static int inet_pton4(const char *src, unsigned char *dst);
42 static int inet_pton6(const char *src, unsigned char *dst);
46 * lwres_net_pton(af, src, dst)
47 * convert from presentation format (which usually means ASCII printable)
48 * to network format (which is usually some kind of binary format).
50 * 1 if the address was valid for the specified address family
51 * 0 if the address wasn't valid (`dst' is untouched in this case)
52 * -1 if some other error occurred (`dst' is untouched in this case, too)
57 lwres_net_pton(int af, const char *src, void *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.
81 inet_pton4(const char *src, unsigned char *dst) {
82 static const char digits[] = "0123456789";
83 int saw_digit, octets, ch;
84 unsigned char tmp[NS_INADDRSZ], *tp;
89 while ((ch = *src++) != '\0') {
92 if ((pch = strchr(digits, ch)) != NULL) {
93 unsigned int new = *tp * 10 + (pch - digits);
103 } else if (ch == '.' && saw_digit) {
113 memcpy(dst, tmp, NS_INADDRSZ);
118 * inet_pton6(src, dst)
119 * convert presentation level address to network order binary form.
121 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
123 * (1) does not touch `dst' unless it's returning 1.
124 * (2) :: in a full address is silently ignored.
126 * inspired by Mark Andrews.
131 inet_pton6(const char *src, unsigned char *dst) {
132 static const char xdigits_l[] = "0123456789abcdef",
133 xdigits_u[] = "0123456789ABCDEF";
134 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
135 const char *xdigits, *curtok;
136 int ch, seen_xdigits;
139 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
140 endp = tp + NS_IN6ADDRSZ;
142 /* Leading :: requires some special handling. */
149 while ((ch = *src++) != '\0') {
152 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
153 pch = strchr((xdigits = xdigits_u), ch);
156 val |= (pch - xdigits);
157 if (++seen_xdigits > 4)
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;
199 for (i = 1; i <= n; i++) {
200 endp[- i] = colonp[n - i];
207 memcpy(dst, tmp, NS_IN6ADDRSZ);