1/*
2 * Copyright (c) 1996,1999 by Internet Software Consortium.
3 *
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.
7 *
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
15 * SOFTWARE.
16 */
17
18#if defined(LIBC_SCCS) && !defined(lint)
19static char rcsid[] = "$Id: inet_pton.c,v 1.3 2003/04/10 18:53:29 majka Exp $";
20#endif /* LIBC_SCCS and not lint */
21
22#ifdef HAVE_CONFIG_H
23#include <config.h>
24#endif
25
26#include <sys/param.h>
27#include <sys/types.h>
28#include <sys/socket.h>
29#include <netinet/in.h>
30#include <arpa/inet.h>
31#include <net/if.h>
32#include <arpa/nameser.h>
33#include <string.h>
34#include <stdlib.h>
35#include <errno.h>
36
37#define INET6 1
38
39#define IN6ADDRSZ              16
40
41#if 0
42#ifndef HAVE_PORTABLE_PROTOTYPE
43#include "cdecl_ext.h"
44#endif
45
46#ifndef HAVE_U_INT16_T
47#include "bittypes.h"
48#endif
49#if !(defined(HAVE_INADDRSZ) && defined(HAVE_IN6ADDRSZ))
50#include "addrsize.h"
51#endif
52#endif
53#ifndef NS_INADDRSZ
54#define NS_INADDRSZ	INADDRSZ
55#endif
56#ifndef NS_IN6ADDRSZ
57#define NS_IN6ADDRSZ	IN6ADDRSZ
58#endif
59#ifndef NS_INT16SZ
60#define NS_INT16SZ	sizeof(u_int16_t)
61#endif
62
63/*
64 * WARNING: Don't even consider trying to compile this on a system where
65 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
66 */
67
68static int	inet_pton4 __P((const char *src, u_char *dst));
69#ifdef INET6
70static int	inet_pton6 __P((const char *src, u_char *dst));
71#endif
72
73/* int
74 * inet_pton(af, src, dst)
75 *	convert from presentation format (which usually means ASCII printable)
76 *	to network format (which is usually some kind of binary format).
77 * return:
78 *	1 if the address was valid for the specified address family
79 *	0 if the address wasn't valid (`dst' is untouched in this case)
80 *	-1 if some other error occurred (`dst' is untouched in this case, too)
81 * author:
82 *	Paul Vixie, 1996.
83 */
84int
85inet_pton(int af, const char *src, void *dst)
86{
87	int status;
88	unsigned short ifnum;
89	char *p, *s;
90
91	switch (af)
92	{
93		case AF_INET:
94		{
95			return (inet_pton4(src, dst));
96		}
97
98#ifdef INET6
99		case AF_INET6:
100		{
101			ifnum = 0;
102			p = NULL;
103			s = (char *)src;
104
105			if (src != NULL) p = strrchr(src, '%');
106			if (p != NULL)
107			{
108				s = strdup(src);
109				if (s == NULL)
110				{
111					errno = ENOMEM;
112					return -1;
113				}
114
115				s[p - src] = '\0';
116			}
117
118			status = inet_pton6(s, dst);
119			if (p != NULL) free(s);
120			if (status != 1) return status;
121
122			if ((p != NULL) && IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)dst))
123			{
124				ifnum = if_nametoindex(++p);
125				ifnum = htons(ifnum);
126				((struct in6_addr *)dst)->__u6_addr.__u6_addr16[1] = ifnum;
127			}
128
129			return 1;
130		}
131#endif
132
133		default:
134		{
135			errno = EAFNOSUPPORT;
136			return -1;
137		}
138	}
139
140	/* NOTREACHED */
141	return -1;
142}
143
144/* int
145 * inet_pton4(src, dst)
146 *	like inet_aton() but without all the hexadecimal and shorthand.
147 * return:
148 *	1 if `src' is a valid dotted quad, else 0.
149 * notice:
150 *	does not touch `dst' unless it's returning 1.
151 * author:
152 *	Paul Vixie, 1996.
153 */
154static int
155inet_pton4(const char *src, u_char *dst)
156{
157	static const char digits[] = "0123456789";
158	int saw_digit, octets, ch;
159	u_char tmp[NS_INADDRSZ], *tp;
160
161	saw_digit = 0;
162	octets = 0;
163	*(tp = tmp) = 0;
164	while ((ch = *src++) != '\0') {
165		const char *pch;
166
167		if ((pch = strchr(digits, ch)) != NULL) {
168			u_int new = *tp * 10 + (pch - digits);
169
170			if (new > 255)
171				return (0);
172			*tp = new;
173			if (! saw_digit) {
174				if (++octets > 4)
175					return (0);
176				saw_digit = 1;
177			}
178		} else if (ch == '.' && saw_digit) {
179			if (octets == 4)
180				return (0);
181			*++tp = 0;
182			saw_digit = 0;
183		} else
184			return (0);
185	}
186	if (octets < 4)
187		return (0);
188	memcpy(dst, tmp, NS_INADDRSZ);
189	return (1);
190}
191
192#ifdef INET6
193/* int
194 * inet_pton6(src, dst)
195 *	convert presentation level address to network order binary form.
196 * return:
197 *	1 if `src' is a valid [RFC1884 2.2] address, else 0.
198 * notice:
199 *	(1) does not touch `dst' unless it's returning 1.
200 *	(2) :: in a full address is silently ignored.
201 * credit:
202 *	inspired by Mark Andrews.
203 * author:
204 *	Paul Vixie, 1996.
205 */
206static int
207inet_pton6(const char *src, u_char *dst)
208{
209	static const char xdigits_l[] = "0123456789abcdef",
210	xdigits_u[] = "0123456789ABCDEF";
211	u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
212	const char *xdigits, *curtok;
213	int ch, saw_xdigit;
214	u_int val;
215
216	memset((tp = tmp), '\0', NS_IN6ADDRSZ);
217	endp = tp + NS_IN6ADDRSZ;
218	colonp = NULL;
219	/* Leading :: requires some special handling. */
220	if (*src == ':')
221		if (*++src != ':')
222			return (0);
223	curtok = src;
224	saw_xdigit = 0;
225	val = 0;
226	while ((ch = *src++) != '\0') {
227		const char *pch;
228
229		if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
230			pch = strchr((xdigits = xdigits_u), ch);
231		if (pch != NULL) {
232			val <<= 4;
233			val |= (pch - xdigits);
234			if (val > 0xffff)
235				return (0);
236			saw_xdigit = 1;
237			continue;
238		}
239		if (ch == ':') {
240			curtok = src;
241			if (!saw_xdigit) {
242				if (colonp)
243					return (0);
244				colonp = tp;
245				continue;
246			} else if (*src == '\0') {
247				return (0);
248			}
249			if (tp + NS_INT16SZ > endp)
250				return (0);
251			*tp++ = (u_char) (val >> 8) & 0xff;
252			*tp++ = (u_char) val & 0xff;
253			saw_xdigit = 0;
254			val = 0;
255			continue;
256		}
257		if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
258		    inet_pton4(curtok, tp) > 0) {
259			tp += NS_INADDRSZ;
260			saw_xdigit = 0;
261			break;	/* '\0' was seen by inet_pton4(). */
262		}
263		return (0);
264	}
265	if (saw_xdigit) {
266		if (tp + NS_INT16SZ > endp)
267			return (0);
268		*tp++ = (u_char) (val >> 8) & 0xff;
269		*tp++ = (u_char) val & 0xff;
270	}
271	if (colonp != NULL) {
272		/*
273		 * Since some memmove()'s erroneously fail to handle
274		 * overlapping regions, we'll do the shift by hand.
275		 */
276		const int n = tp - colonp;
277		int i;
278
279		if (tp == endp)
280			return (0);
281		for (i = 1; i <= n; i++) {
282			endp[- i] = colonp[n - i];
283			colonp[n - i] = 0;
284		}
285		tp = endp;
286	}
287	if (tp != endp)
288		return (0);
289	memcpy(dst, tmp, NS_IN6ADDRSZ);
290	return (1);
291}
292#endif /*INET6*/
293