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
19 #if defined(LIBC_SCCS) && !defined(lint)
20 static char rcsid[] = "$FreeBSD: src/lib/libc/net/inet_pton.c,v 1.6.2.1 2002/04/28 05:40:24 suz Exp $";
21 #endif /* LIBC_SCCS and not lint */
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>
33 * WARNING: Don't even consider trying to compile this on a system where
34 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
37 static int inet_pton4 __P((const char *src, u_char *dst));
38 static int inet_pton6 __P((const char *src, u_char *dst));
41 * inet_pton(af, src, dst)
42 * convert from presentation format (which usually means ASCII printable)
43 * to network format (which is usually some kind of binary format).
45 * 1 if the address was valid for the specified address family
46 * 0 if the address wasn't valid (`dst' is untouched in this case)
47 * -1 if some other error occurred (`dst' is untouched in this case, too)
52 inet_pton(af, src, dst)
59 return (inet_pton4(src, dst));
61 return (inet_pton6(src, dst));
70 * inet_pton4(src, dst)
71 * like inet_aton() but without all the hexadecimal and shorthand.
73 * 1 if `src' is a valid dotted quad, else 0.
75 * does not touch `dst' unless it's returning 1.
84 static const char digits[] = "0123456789";
85 int saw_digit, octets, ch;
86 u_char tmp[NS_INADDRSZ], *tp;
91 while ((ch = *src++) != '\0') {
94 if ((pch = strchr(digits, ch)) != NULL) {
95 u_int new = *tp * 10 + (pch - digits);
105 } else if (ch == '.' && saw_digit) {
116 memcpy(dst, tmp, NS_INADDRSZ);
121 * inet_pton6(src, dst)
122 * convert presentation level address to network order binary form.
124 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
126 * (1) does not touch `dst' unless it's returning 1.
127 * (2) :: in a full address is silently ignored.
129 * inspired by Mark Andrews.
138 static const char xdigits_l[] = "0123456789abcdef",
139 xdigits_u[] = "0123456789ABCDEF";
140 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
141 const char *xdigits, *curtok;
145 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
146 endp = tp + NS_IN6ADDRSZ;
148 /* Leading :: requires some special handling. */
155 while ((ch = *src++) != '\0') {
158 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
159 pch = strchr((xdigits = xdigits_u), ch);
162 val |= (pch - xdigits);
176 if (tp + NS_INT16SZ > endp)
178 *tp++ = (u_char) (val >> 8) & 0xff;
179 *tp++ = (u_char) val & 0xff;
184 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
185 inet_pton4(curtok, tp) > 0) {
188 break; /* '\0' was seen by inet_pton4(). */
193 if (tp + NS_INT16SZ > endp)
195 *tp++ = (u_char) (val >> 8) & 0xff;
196 *tp++ = (u_char) val & 0xff;
198 if (colonp != NULL) {
200 * Since some memmove()'s erroneously fail to handle
201 * overlapping regions, we'll do the shift by hand.
203 const int n = tp - colonp;
206 for (i = 1; i <= n; i++) {
207 endp[- i] = colonp[n - i];
214 memcpy(dst, tmp, NS_IN6ADDRSZ);
219 * Weak aliases for applications that use certain private entry points,
220 * and fail to include <arpa/inet.h>.
223 __weak_reference(__inet_pton, inet_pton);