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#if defined(LIBC_SCCS) && !defined(lint)
18static const char rcsid[] = "$Id: inet_pton.c,v 1.3.18.2 2005/07/28 07:38:07 marka Exp $";
19#endif /* LIBC_SCCS and not lint */
20
21#include <string.h>
22
23#include <sys/param.h>
24#include <sys/socket.h>
25#include <sys/systm.h>
26
27#include <netinet/in.h>
28
29/*%
30 * WARNING: Don't even consider trying to compile this on a system where
31 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
32 */
33
34static int inet_pton4(const char *src, u_char *dst);
35static int inet_pton6(const char *src, u_char *dst);
36
37/* int
38 * inet_pton(af, src, dst)
39 * convert from presentation format (which usually means ASCII printable)
40 * to network format (which is usually some kind of binary format).
41 * return:
42 * 1 if the address was valid for the specified address family
43 * 0 if the address wasn't valid (`dst' is untouched in this case)
44 * -1 if some other error occurred (`dst' is untouched in this case, too)
45 * author:
46 * Paul Vixie, 1996.
47 */
48int
49inet_pton(int af, const char *src, void *dst)
50{
51 switch (af) {
52 case AF_INET:
53 return (inet_pton4(src, dst));
54 case AF_INET6:
55 return (inet_pton6(src, dst));
56 default:
57 return (-1);
58 }
59 /* NOTREACHED */
60}
61
62/* int
63 * inet_pton4(src, dst)
64 * like inet_aton() but without all the hexadecimal and shorthand.
65 * return:
66 * 1 if `src' is a valid dotted quad, else 0.
67 * notice:
68 * does not touch `dst' unless it's returning 1.
69 * author:
70 * Paul Vixie, 1996.
71 */
72static int
73inet_pton4(const char *src, u_char *dst)
74{
75 static const char digits[] = "0123456789";
76 int saw_digit, octets, ch;
77#define NS_INADDRSZ 4
78 u_char tmp[NS_INADDRSZ], *tp;
79
80 saw_digit = 0;
81 octets = 0;
82 *(tp = tmp) = 0;
83 while ((ch = *src++) != '\0') {
84 const char *pch;
85
86 if ((pch = strchr(digits, ch)) != NULL) {
87 u_int new = *tp * 10 + (pch - digits);
88
89 if (saw_digit && *tp == 0)
90 return (0);
91 if (new > 255)
92 return (0);
93 *tp = new;
94 if (!saw_digit) {
95 if (++octets > 4)
96 return (0);
97 saw_digit = 1;
98 }
99 } else if (ch == '.' && saw_digit) {
100 if (octets == 4)
101 return (0);
102 *++tp = 0;
103 saw_digit = 0;
104 } else
105 return (0);
106 }
107 if (octets < 4)
108 return (0);
109 memcpy(dst, tmp, NS_INADDRSZ);
110 return (1);
111}
112
113/* int
114 * inet_pton6(src, dst)
115 * convert presentation level address to network order binary form.
116 * return:
117 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
118 * notice:
119 * (1) does not touch `dst' unless it's returning 1.
120 * (2) :: in a full address is silently ignored.
121 * credit:
122 * inspired by Mark Andrews.
123 * author:
124 * Paul Vixie, 1996.
125 */
126static int
127inet_pton6(const char *src, u_char *dst)
128{
129 static const char xdigits_l[] = "0123456789abcdef",
130 xdigits_u[] = "0123456789ABCDEF";
131#define NS_IN6ADDRSZ 16
132#define NS_INT16SZ 2
133 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
134 const char *xdigits, *curtok;
135 int ch, seen_xdigits;
136 u_int val;
137
138 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
139 endp = tp + NS_IN6ADDRSZ;
140 colonp = NULL;
141 /* Leading :: requires some special handling. */
142 if (*src == ':')
143 if (*++src != ':')
144 return (0);
145 curtok = src;
146 seen_xdigits = 0;
147 val = 0;
148 while ((ch = *src++) != '\0') {
149 const char *pch;
150
151 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
152 pch = strchr((xdigits = xdigits_u), ch);
153 if (pch != NULL) {
154 val <<= 4;
155 val |= (pch - xdigits);
156 if (++seen_xdigits > 4)
157 return (0);
158 continue;
159 }
160 if (ch == ':') {
161 curtok = src;
162 if (!seen_xdigits) {
163 if (colonp)
164 return (0);
165 colonp = tp;
166 continue;
167 } else if (*src == '\0') {
168 return (0);
169 }
170 if (tp + NS_INT16SZ > endp)
171 return (0);
172 *tp++ = (u_char) (val >> 8) & 0xff;
173 *tp++ = (u_char) val & 0xff;
174 seen_xdigits = 0;
175 val = 0;
176 continue;
177 }
178 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
179 inet_pton4(curtok, tp) > 0) {
180 tp += NS_INADDRSZ;
181 seen_xdigits = 0;
182 break; /*%< '\\0' was seen by inet_pton4(). */
183 }
184 return (0);
185 }
186 if (seen_xdigits) {
187 if (tp + NS_INT16SZ > endp)
188 return (0);
189 *tp++ = (u_char) (val >> 8) & 0xff;
190 *tp++ = (u_char) val & 0xff;
191 }
192 if (colonp != NULL) {
193 /*
194 * Since some memmove()'s erroneously fail to handle
195 * overlapping regions, we'll do the shift by hand.
196 */
197 const int n = tp - colonp;
198 int i;
199
200 if (tp == endp)
201 return (0);
202 for (i = 1; i <= n; i++) {
203 endp[- i] = colonp[n - i];
204 colonp[n - i] = 0;
205 }
206 tp = endp;
207 }
208 if (tp != endp)
209 return (0);
210 memcpy(dst, tmp, NS_IN6ADDRSZ);
211 return (1);
212}
213