2 * Copyright (c) 1996,1999 by Internet Software Consortium.
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static char rcsid[] = "$Id: inet_pton.c,v 1.2 1999/10/14 06:55:10 guy Exp $";
20 #endif /* LIBC_SCCS and not lint */
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>
31 #include "inet_v6defs.h"
37 #define NS_IN6ADDRSZ 16
44 * WARNING: Don't even consider trying to compile this on a system where
45 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
49 static int inet_pton4 __P((const char *src, u_char *dst));
52 static int inet_pton6 __P((const char *src, u_char *dst));
56 * inet_pton(af, src, dst)
57 * convert from presentation format (which usually means ASCII printable)
58 * to network format (which is usually some kind of binary format).
60 * 1 if the address was valid for the specified address family
61 * 0 if the address wasn't valid (`dst' is untouched in this case)
62 * -1 if some other error occurred (`dst' is untouched in this case, too)
67 inet_pton(af, src, dst)
75 return (inet_pton4(src, dst));
79 return (inet_pton6(src, dst));
90 * inet_pton4(src, dst)
91 * like inet_aton() but without all the hexadecimal and shorthand.
93 * 1 if `src' is a valid dotted quad, else 0.
95 * does not touch `dst' unless it's returning 1.
104 static const char digits[] = "0123456789";
105 int saw_digit, octets, ch;
106 u_char tmp[NS_INADDRSZ], *tp;
111 while ((ch = *src++) != '\0') {
114 if ((pch = strchr(digits, ch)) != NULL) {
115 u_int new = *tp * 10 + (pch - digits);
125 } else if (ch == '.' && saw_digit) {
135 memcpy(dst, tmp, NS_INADDRSZ);
142 * inet_pton6(src, dst)
143 * convert presentation level address to network order binary form.
145 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
147 * (1) does not touch `dst' unless it's returning 1.
148 * (2) :: in a full address is silently ignored.
150 * inspired by Mark Andrews.
159 static const char xdigits_l[] = "0123456789abcdef",
160 xdigits_u[] = "0123456789ABCDEF";
161 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
162 const char *xdigits, *curtok;
166 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
167 endp = tp + NS_IN6ADDRSZ;
169 /* Leading :: requires some special handling. */
176 while ((ch = *src++) != '\0') {
179 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
180 pch = strchr((xdigits = xdigits_u), ch);
183 val |= (pch - xdigits);
196 } else if (*src == '\0') {
199 if (tp + NS_INT16SZ > endp)
201 *tp++ = (u_char) (val >> 8) & 0xff;
202 *tp++ = (u_char) val & 0xff;
207 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
208 inet_pton4(curtok, tp) > 0) {
211 break; /* '\0' was seen by inet_pton4(). */
216 if (tp + NS_INT16SZ > endp)
218 *tp++ = (u_char) (val >> 8) & 0xff;
219 *tp++ = (u_char) val & 0xff;
221 if (colonp != NULL) {
223 * Since some memmove()'s erroneously fail to handle
224 * overlapping regions, we'll do the shift by hand.
226 const int n = tp - colonp;
231 for (i = 1; i <= n; i++) {
232 endp[- i] = colonp[n - i];
239 memcpy(dst, tmp, NS_IN6ADDRSZ);