1/*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996,1999 by Internet Software Consortium.
4 *
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.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <sys/param.h>
19#include <sys/socket.h>
20#include <sys/systm.h>
21
22#include <netinet/in.h>
23
24/*%
25 * WARNING: Don't even consider trying to compile this on a system where
26 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
27 */
28
29static int	inet_pton4(const char *src, u_char *dst);
30static int	inet_pton6(const char *src, u_char *dst);
31
32/* int
33 * inet_pton(af, src, dst)
34 *	convert from presentation format (which usually means ASCII printable)
35 *	to network format (which is usually some kind of binary format).
36 * return:
37 *	1 if the address was valid for the specified address family
38 *	0 if the address wasn't valid (`dst' is untouched in this case)
39 *	-1 if some other error occurred (`dst' is untouched in this case, too)
40 * author:
41 *	Paul Vixie, 1996.
42 */
43int
44inet_pton(int af, const char *src, void *dst)
45{
46	switch (af) {
47	case AF_INET:
48		return (inet_pton4(src, dst));
49	case AF_INET6:
50		return (inet_pton6(src, dst));
51	default:
52		return (-1);
53	}
54	/* NOTREACHED */
55}
56
57/* int
58 * inet_pton4(src, dst)
59 *	like inet_aton() but without all the hexadecimal and shorthand.
60 * return:
61 *	1 if `src' is a valid dotted quad, else 0.
62 * notice:
63 *	does not touch `dst' unless it's returning 1.
64 * author:
65 *	Paul Vixie, 1996.
66 */
67static int
68inet_pton4(const char *src, u_char *dst)
69{
70	static const char digits[] = "0123456789";
71	int saw_digit, octets, ch;
72#define NS_INADDRSZ	4
73	u_char tmp[NS_INADDRSZ], *tp;
74
75	saw_digit = 0;
76	octets = 0;
77	*(tp = tmp) = 0;
78	while ((ch = *src++) != '\0') {
79		const char *pch;
80
81		if ((pch = strchr(digits, ch)) != NULL) {
82			u_int new = *tp * 10 + (pch - digits);
83
84			if (saw_digit && *tp == 0)
85				return (0);
86			if (new > 255)
87				return (0);
88			*tp = new;
89			if (!saw_digit) {
90				if (++octets > 4)
91					return (0);
92				saw_digit = 1;
93			}
94		} else if (ch == '.' && saw_digit) {
95			if (octets == 4)
96				return (0);
97			*++tp = 0;
98			saw_digit = 0;
99		} else
100			return (0);
101	}
102	if (octets < 4)
103		return (0);
104	memcpy(dst, tmp, NS_INADDRSZ);
105	return (1);
106}
107
108/* int
109 * inet_pton6(src, dst)
110 *	convert presentation level address to network order binary form.
111 * return:
112 *	1 if `src' is a valid [RFC1884 2.2] address, else 0.
113 * notice:
114 *	(1) does not touch `dst' unless it's returning 1.
115 *	(2) :: in a full address is silently ignored.
116 * credit:
117 *	inspired by Mark Andrews.
118 * author:
119 *	Paul Vixie, 1996.
120 */
121static int
122inet_pton6(const char *src, u_char *dst)
123{
124	static const char xdigits_l[] = "0123456789abcdef",
125			  xdigits_u[] = "0123456789ABCDEF";
126#define NS_IN6ADDRSZ	16
127#define NS_INT16SZ	2
128	u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
129	const char *xdigits, *curtok;
130	int ch, seen_xdigits;
131	u_int val;
132
133	memset((tp = tmp), '\0', NS_IN6ADDRSZ);
134	endp = tp + NS_IN6ADDRSZ;
135	colonp = NULL;
136	/* Leading :: requires some special handling. */
137	if (*src == ':')
138		if (*++src != ':')
139			return (0);
140	curtok = src;
141	seen_xdigits = 0;
142	val = 0;
143	while ((ch = *src++) != '\0') {
144		const char *pch;
145
146		if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
147			pch = strchr((xdigits = xdigits_u), ch);
148		if (pch != NULL) {
149			val <<= 4;
150			val |= (pch - xdigits);
151			if (++seen_xdigits > 4)
152				return (0);
153			continue;
154		}
155		if (ch == ':') {
156			curtok = src;
157			if (!seen_xdigits) {
158				if (colonp)
159					return (0);
160				colonp = tp;
161				continue;
162			} else if (*src == '\0') {
163				return (0);
164			}
165			if (tp + NS_INT16SZ > endp)
166				return (0);
167			*tp++ = (u_char) (val >> 8) & 0xff;
168			*tp++ = (u_char) val & 0xff;
169			seen_xdigits = 0;
170			val = 0;
171			continue;
172		}
173		if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
174		    inet_pton4(curtok, tp) > 0) {
175			tp += NS_INADDRSZ;
176			seen_xdigits = 0;
177			break;	/*%< '\\0' was seen by inet_pton4(). */
178		}
179		return (0);
180	}
181	if (seen_xdigits) {
182		if (tp + NS_INT16SZ > endp)
183			return (0);
184		*tp++ = (u_char) (val >> 8) & 0xff;
185		*tp++ = (u_char) val & 0xff;
186	}
187	if (colonp != NULL) {
188		/*
189		 * Since some memmove()'s erroneously fail to handle
190		 * overlapping regions, we'll do the shift by hand.
191		 */
192		const int n = tp - colonp;
193		int i;
194
195		if (tp == endp)
196			return (0);
197		for (i = 1; i <= n; i++) {
198			endp[- i] = colonp[n - i];
199			colonp[n - i] = 0;
200		}
201		tp = endp;
202	}
203	if (tp != endp)
204		return (0);
205	memcpy(dst, tmp, NS_IN6ADDRSZ);
206	return (1);
207}
208
209/*! \file */
210