1 /* Copyright (c) 1996 by Internet Software Consortium.
3 * Permission to use, copy, modify, and distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
7 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
8 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
9 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
10 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
11 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
12 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
13 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
17 #if defined(LIBC_SCCS) && !defined(lint)
18 static char rcsid[] = "$Id: inet_pton.c,v 1.4 1998/06/11 09:02:35 peter Exp $";
19 #endif /* LIBC_SCCS and not lint */
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>
31 * WARNING: Don't even consider trying to compile this on a system where
32 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
35 static int inet_pton4 __P((const char *src, u_char *dst));
36 static int inet_pton6 __P((const char *src, u_char *dst));
39 * inet_pton(af, src, dst)
40 * convert from presentation format (which usually means ASCII printable)
41 * to network format (which is usually some kind of binary format).
43 * 1 if the address was valid for the specified address family
44 * 0 if the address wasn't valid (`dst' is untouched in this case)
45 * -1 if some other error occurred (`dst' is untouched in this case, too)
50 inet_pton(af, src, dst)
57 return (inet_pton4(src, dst));
59 return (inet_pton6(src, dst));
68 * inet_pton4(src, dst)
69 * like inet_aton() but without all the hexadecimal and shorthand.
71 * 1 if `src' is a valid dotted quad, else 0.
73 * does not touch `dst' unless it's returning 1.
82 static const char digits[] = "0123456789";
83 int saw_digit, octets, ch;
84 u_char tmp[NS_INADDRSZ], *tp;
89 while ((ch = *src++) != '\0') {
92 if ((pch = strchr(digits, ch)) != NULL) {
93 u_int new = *tp * 10 + (pch - digits);
103 } else if (ch == '.' && saw_digit) {
114 memcpy(dst, tmp, NS_INADDRSZ);
119 * inet_pton6(src, dst)
120 * convert presentation level address to network order binary form.
122 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
124 * (1) does not touch `dst' unless it's returning 1.
125 * (2) :: in a full address is silently ignored.
127 * inspired by Mark Andrews.
136 static const char xdigits_l[] = "0123456789abcdef",
137 xdigits_u[] = "0123456789ABCDEF";
138 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
139 const char *xdigits, *curtok;
143 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
144 endp = tp + NS_IN6ADDRSZ;
146 /* Leading :: requires some special handling. */
153 while ((ch = *src++) != '\0') {
156 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
157 pch = strchr((xdigits = xdigits_u), ch);
160 val |= (pch - xdigits);
174 if (tp + NS_INT16SZ > endp)
176 *tp++ = (u_char) (val >> 8) & 0xff;
177 *tp++ = (u_char) val & 0xff;
182 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
183 inet_pton4(curtok, tp) > 0) {
186 break; /* '\0' was seen by inet_pton4(). */
191 if (tp + NS_INT16SZ > endp)
193 *tp++ = (u_char) (val >> 8) & 0xff;
194 *tp++ = (u_char) val & 0xff;
196 if (colonp != NULL) {
198 * Since some memmove()'s erroneously fail to handle
199 * overlapping regions, we'll do the shift by hand.
201 const int n = tp - colonp;
204 for (i = 1; i <= n; i++) {
205 endp[- i] = colonp[n - i];
212 memcpy(dst, tmp, NS_IN6ADDRSZ);
217 * Weak aliases for applications that use certain private entry points,
218 * and fail to include <arpa/inet.h>.
221 __weak_reference(__inet_pton, inet_pton);