1/*	$NetBSD: inet_pton.c,v 1.1.1.2 2012/01/31 21:20:49 kardel Exp $	*/
2
3/*
4 * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (C) 1996-2003  Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20/*! \file */
21
22#if defined(LIBC_SCCS) && !defined(lint)
23static char rcsid[] =
24	"Id: inet_pton.c,v 1.19 2007/06/19 23:47:17 tbox Exp";
25#endif /* LIBC_SCCS and not lint */
26
27#include <config.h>
28
29#include <errno.h>
30#include <string.h>
31
32#include <isc/net.h>
33
34/*% INT16 Size */
35#define NS_INT16SZ	 2
36/*% IPv4 Address Size */
37#define NS_INADDRSZ	 4
38/*% IPv6 Address Size */
39#define NS_IN6ADDRSZ	16
40
41/*
42 * WARNING: Don't even consider trying to compile this on a system where
43 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
44 */
45
46#ifdef notdef
47static int inet_pton4(const char *src, unsigned char *dst);
48static int inet_pton6(const char *src, unsigned char *dst);
49
50/*%
51 *	convert from presentation format (which usually means ASCII printable)
52 *	to network format (which is usually some kind of binary format).
53 * \return
54 *	1 if the address was valid for the specified address family
55 *	0 if the address wasn't valid (`dst' is untouched in this case)
56 *	-1 if some other error occurred (`dst' is untouched in this case, too)
57 * \author
58 *	Paul Vixie, 1996.
59 */
60int
61isc_net_pton(int af, const char *src, void *dst) {
62	switch (af) {
63	case AF_INET:
64		return (inet_pton4(src, dst));
65	case AF_INET6:
66		return (inet_pton6(src, dst));
67	default:
68		errno = EAFNOSUPPORT;
69		return (-1);
70	}
71	/* NOTREACHED */
72}
73
74/*!\fn static int inet_pton4(const char *src, unsigned char *dst)
75 * \brief
76 *	like inet_aton() but without all the hexadecimal and shorthand.
77 * \return
78 *	1 if `src' is a valid dotted quad, else 0.
79 * \note
80 *	does not touch `dst' unless it's returning 1.
81 * \author
82 *	Paul Vixie, 1996.
83 */
84static int
85inet_pton4(const char *src, unsigned char *dst) {
86	static const char digits[] = "0123456789";
87	int saw_digit, octets, ch;
88	unsigned char tmp[NS_INADDRSZ], *tp;
89
90	saw_digit = 0;
91	octets = 0;
92	*(tp = tmp) = 0;
93	while ((ch = *src++) != '\0') {
94		const char *pch;
95
96		if ((pch = strchr(digits, ch)) != NULL) {
97			unsigned int newv = *tp * 10 + (pch - digits);
98
99			if (saw_digit && *tp == 0)
100				return (0);
101			if (newv > 255)
102				return (0);
103			*tp = (unsigned char)newv;
104			if (!saw_digit) {
105				if (++octets > 4)
106					return (0);
107				saw_digit = 1;
108			}
109		} else if (ch == '.' && saw_digit) {
110			if (octets == 4)
111				return (0);
112			*++tp = 0;
113			saw_digit = 0;
114		} else
115			return (0);
116	}
117	if (octets < 4)
118		return (0);
119	memcpy(dst, tmp, NS_INADDRSZ);
120	return (1);
121}
122
123/*%
124 *	convert presentation level address to network order binary form.
125 * \return
126 *	1 if `src' is a valid [RFC1884 2.2] address, else 0.
127 * \note
128 *	(1) does not touch `dst' unless it's returning 1.
129 * \note
130 *	(2) :: in a full address is silently ignored.
131 * \author
132 *	inspired by Mark Andrews.
133 * \author
134 *	Paul Vixie, 1996.
135 */
136static int
137inet_pton6(const char *src, unsigned char *dst) {
138	static const char xdigits_l[] = "0123456789abcdef",
139			  xdigits_u[] = "0123456789ABCDEF";
140	unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
141	const char *xdigits, *curtok;
142	int ch, seen_xdigits;
143	unsigned int val;
144
145	memset((tp = tmp), '\0', NS_IN6ADDRSZ);
146	endp = tp + NS_IN6ADDRSZ;
147	colonp = NULL;
148	/* Leading :: requires some special handling. */
149	if (*src == ':')
150		if (*++src != ':')
151			return (0);
152	curtok = src;
153	seen_xdigits = 0;
154	val = 0;
155	while ((ch = *src++) != '\0') {
156		const char *pch;
157
158		if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
159			pch = strchr((xdigits = xdigits_u), ch);
160		if (pch != NULL) {
161			val <<= 4;
162			val |= (pch - xdigits);
163			if (++seen_xdigits > 4)
164				return (0);
165			continue;
166		}
167		if (ch == ':') {
168			curtok = src;
169			if (!seen_xdigits) {
170				if (colonp)
171					return (0);
172				colonp = tp;
173				continue;
174			}
175			if (tp + NS_INT16SZ > endp)
176				return (0);
177			*tp++ = (unsigned char) (val >> 8) & 0xff;
178			*tp++ = (unsigned char) val & 0xff;
179			seen_xdigits = 0;
180			val = 0;
181			continue;
182		}
183		if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
184		    inet_pton4(curtok, tp) > 0) {
185			tp += NS_INADDRSZ;
186			seen_xdigits = 0;
187			break;	/* '\0' was seen by inet_pton4(). */
188		}
189		return (0);
190	}
191	if (seen_xdigits) {
192		if (tp + NS_INT16SZ > endp)
193			return (0);
194		*tp++ = (unsigned char) (val >> 8) & 0xff;
195		*tp++ = (unsigned char) val & 0xff;
196	}
197	if (colonp != NULL) {
198		/*
199		 * Since some memmove()'s erroneously fail to handle
200		 * overlapping regions, we'll do the shift by hand.
201		 */
202		const int n = tp - colonp;
203		int i;
204
205		if (tp == endp)
206			return (0);
207		for (i = 1; i <= n; i++) {
208			endp[- i] = colonp[n - i];
209			colonp[n - i] = 0;
210		}
211		tp = endp;
212	}
213	if (tp != endp)
214		return (0);
215	memcpy(dst, tmp, NS_IN6ADDRSZ);
216	return (1);
217}
218#endif
219