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
18 * $FreeBSD: src/lib/libc/net/inet_pton.c,v 1.6.2.1 2002/04/28 05:40:24 suz Exp $
19 * $DragonFly: src/lib/libc/net/inet_pton.c,v 1.5 2007/04/19 12:52:29 corecode Exp $
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>
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 *src
, void *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
) {
112 memcpy(dst
, tmp
, NS_INADDRSZ
);
117 * inet_pton6(src, dst)
118 * convert presentation level address to network order binary form.
120 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
122 * (1) does not touch `dst' unless it's returning 1.
123 * (2) :: in a full address is silently ignored.
125 * inspired by Mark Andrews.
130 inet_pton6(const char *src
, u_char
*dst
)
132 static const char xdigits_l
[] = "0123456789abcdef",
133 xdigits_u
[] = "0123456789ABCDEF";
134 u_char tmp
[NS_IN6ADDRSZ
], *tp
, *endp
, *colonp
;
135 const char *xdigits
, *curtok
;
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
);
169 } else if (*src
== '\0')
171 if (tp
+ NS_INT16SZ
> endp
)
173 *tp
++ = (u_char
) (val
>> 8) & 0xff;
174 *tp
++ = (u_char
) val
& 0xff;
179 if (ch
== '.' && ((tp
+ NS_INADDRSZ
) <= endp
) &&
180 inet_pton4(curtok
, tp
) > 0) {
183 break; /* '\0' was seen by inet_pton4(). */
188 if (tp
+ NS_INT16SZ
> endp
)
190 *tp
++ = (u_char
) (val
>> 8) & 0xff;
191 *tp
++ = (u_char
) val
& 0xff;
193 if (colonp
!= NULL
) {
195 * Since some memmove()'s erroneously fail to handle
196 * overlapping regions, we'll do the shift by hand.
198 const int n
= tp
- colonp
;
203 for (i
= 1; i
<= n
; i
++) {
204 endp
[- i
] = colonp
[n
- i
];
211 memcpy(dst
, tmp
, NS_IN6ADDRSZ
);
216 * Weak aliases for applications that use certain private entry points,
217 * and fail to include <arpa/inet.h>.
220 __weak_reference(__inet_pton
, inet_pton
);