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(s: digits, c: ch)) != NULL) {
87 u_int new = *tp * 10 + (u_int)(pch - digits);
88
89 if (saw_digit && *tp == 0) {
90 return 0;
91 }
92 if (new > 255) {
93 return 0;
94 }
95 *tp = (u_char)new;
96 if (!saw_digit) {
97 if (++octets > 4) {
98 return 0;
99 }
100 saw_digit = 1;
101 }
102 } else if (ch == '.' && saw_digit) {
103 if (octets == 4) {
104 return 0;
105 }
106 *++tp = 0;
107 saw_digit = 0;
108 } else {
109 return 0;
110 }
111 }
112 if (octets < 4) {
113 return 0;
114 }
115 memcpy(dst, src: tmp, NS_INADDRSZ);
116 return 1;
117}
118
119/* int
120 * inet_pton6(src, dst)
121 * convert presentation level address to network order binary form.
122 * return:
123 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
124 * notice:
125 * (1) does not touch `dst' unless it's returning 1.
126 * (2) :: in a full address is silently ignored.
127 * credit:
128 * inspired by Mark Andrews.
129 * author:
130 * Paul Vixie, 1996.
131 */
132static int
133inet_pton6(const char *src, u_char *dst)
134{
135 static const char xdigits_l[] = "0123456789abcdef",
136 xdigits_u[] = "0123456789ABCDEF";
137#define NS_IN6ADDRSZ 16
138#define NS_INT16SZ 2
139 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
140 const char *xdigits, *curtok;
141 int ch, seen_xdigits;
142 u_int val;
143
144 memset(s: (tp = tmp), c: '\0', NS_IN6ADDRSZ);
145 endp = tp + NS_IN6ADDRSZ;
146 colonp = NULL;
147 /* Leading :: requires some special handling. */
148 if (*src == ':') {
149 if (*++src != ':') {
150 return 0;
151 }
152 }
153 curtok = src;
154 seen_xdigits = 0;
155 val = 0;
156 while ((ch = *src++) != '\0') {
157 const char *pch;
158
159 if ((pch = strchr(s: (xdigits = xdigits_l), c: ch)) == NULL) {
160 pch = strchr(s: (xdigits = xdigits_u), c: ch);
161 }
162 if (pch != NULL) {
163 val <<= 4;
164 val |= (pch - xdigits);
165 if (++seen_xdigits > 4) {
166 return 0;
167 }
168 continue;
169 }
170 if (ch == ':') {
171 curtok = src;
172 if (!seen_xdigits) {
173 if (colonp) {
174 return 0;
175 }
176 colonp = tp;
177 continue;
178 } else if (*src == '\0') {
179 return 0;
180 }
181 if (tp + NS_INT16SZ > endp) {
182 return 0;
183 }
184 *tp++ = (u_char) (val >> 8) & 0xff;
185 *tp++ = (u_char) val & 0xff;
186 seen_xdigits = 0;
187 val = 0;
188 continue;
189 }
190 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
191 inet_pton4(src: curtok, dst: tp) > 0) {
192 tp += NS_INADDRSZ;
193 seen_xdigits = 0;
194 break; /*%< '\\0' was seen by inet_pton4(). */
195 }
196 return 0;
197 }
198 if (seen_xdigits) {
199 if (tp + NS_INT16SZ > endp) {
200 return 0;
201 }
202 *tp++ = (u_char) (val >> 8) & 0xff;
203 *tp++ = (u_char) val & 0xff;
204 }
205 if (colonp != NULL) {
206 /*
207 * Since some memmove()'s erroneously fail to handle
208 * overlapping regions, we'll do the shift by hand.
209 */
210 const long n = tp - colonp;
211 int i;
212
213 if (tp == endp) {
214 return 0;
215 }
216 for (i = 1; i <= n; i++) {
217 endp[-i] = colonp[n - i];
218 colonp[n - i] = 0;
219 }
220 tp = endp;
221 }
222 if (tp != endp) {
223 return 0;
224 }
225 memcpy(dst, src: tmp, NS_IN6ADDRSZ);
226 return 1;
227}
228