1/*
2 * Copyright (C) 1996-2001 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
9 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
10 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
11 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
13 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
14 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
15 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17#include <errno.h>
19#include <sys/types.h>
20#include <sys/socket.h>
21#include <netinet/in.h>
22#include <arpa/inet.h>
23#include <stdio.h>
24#include <string.h>
25#ifndef NS_INT16SZ
27#define NS_INT16SZ 2
28#endif
29#ifndef NS_INADDRSZ
31#define NS_INADDRSZ 4
32#endif
33#ifndef NS_IN6ADDRSZ
35#define NS_IN6ADDRSZ 16
36#endif
37/*
39 * WARNING: Don't even consider trying to compile this on a system where
40 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
41 */
42static int inet_pton4(const char *src, unsigned char *dst);
44static int inet_pton6(const char *src, unsigned char *dst);
45/* int
47 * inet_pton4(src, dst)
48 * like inet_aton() but without all the hexadecimal and shorthand.
49 * return:
50 * 1 if `src' is a valid dotted quad, else 0.
51 * notice:
52 * does not touch `dst' unless it's returning 1.
53 * author:
54 * Paul Vixie, 1996.
55 */
56static int
57inet_pton4(const char *src, unsigned char *dst)
58{
59 static const char digits[] = "0123456789";
60 int saw_digit, octets, ch;
61 unsigned char tmp[NS_INADDRSZ], *tp;
62 saw_digit = 0;
64 octets = 0;
65 *(tp = tmp) = 0;
66 while ((ch = *src++) != '\0') {
67 const char *pch;
68 if ((pch = strchr(digits, ch)) != NULL) {
70 unsigned int new = *tp * 10 + (pch - digits);
71 if (new > 255)
73 return (0);
74 *tp = new;
75 if (! saw_digit) {
76 if (++octets > 4)
77 return (0);
78 saw_digit = 1;
79 }
80 } else if (ch == '.' && saw_digit) {
81 if (octets == 4)
82 return (0);
83 *++tp = 0;
84 saw_digit = 0;
85 } else
86 return (0);
87 }
88 if (octets < 4)
89 return (0);
90 memcpy(dst, tmp, NS_INADDRSZ);
91 return (1);
92}
93/* int
95 * inet_pton6(src, dst)
96 * convert presentation level address to network order binary form.
97 * return:
98 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
99 * notice:
100 * (1) does not touch `dst' unless it's returning 1.
101 * (2) :: in a full address is silently ignored.
102 * credit:
103 * inspired by Mark Andrews.
104 * author:
105 * Paul Vixie, 1996.
106 */
107#ifndef NO_IPV6
109static int
110inet_pton6(const char *src, unsigned char *dst)
111{
112 static const char xdigits_l[] = "0123456789abcdef",
113 xdigits_u[] = "0123456789ABCDEF";
114 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
115 const char *xdigits, *curtok;
116 int ch, saw_xdigit;
117 unsigned int val;
118 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
120 endp = tp + NS_IN6ADDRSZ;
121 colonp = NULL;
122 /* Leading :: requires some special handling. */
123 if (*src == ':')
124 if (*++src != ':')
125 return (0);
126 curtok = src;
127 saw_xdigit = 0;
128 val = 0;
129 while ((ch = *src++) != '\0') {
130 const char *pch;
131 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
133 pch = strchr((xdigits = xdigits_u), ch);
134 if (pch != NULL) {
135 val <<= 4;
136 val |= (pch - xdigits);
137 if (val > 0xffff)
138 return (0);
139 saw_xdigit = 1;
140 continue;
141 }
142 if (ch == ':') {
143 curtok = src;
144 if (!saw_xdigit) {
145 if (colonp)
146 return (0);
147 colonp = tp;
148 continue;
149 }
150 if (tp + NS_INT16SZ > endp)
151 return (0);
152 *tp++ = (unsigned char) (val >> 8) & 0xff;
153 *tp++ = (unsigned char) val & 0xff;
154 saw_xdigit = 0;
155 val = 0;
156 continue;
157 }
158 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
159 inet_pton4(curtok, tp) > 0) {
160 tp += NS_INADDRSZ;
161 saw_xdigit = 0;
162 break; /* '\0' was seen by inet_pton4(). */
163 }
164 return (0);
165 }
166 if (saw_xdigit) {
167 if (tp + NS_INT16SZ > endp)
168 return (0);
169 *tp++ = (unsigned char) (val >> 8) & 0xff;
170 *tp++ = (unsigned char) val & 0xff;
171 }
172 if (colonp != NULL) {
173 /*
174 * Since some memmove()'s erroneously fail to handle
175 * overlapping regions, we'll do the shift by hand.
176 */
177 const int n = tp - colonp;
178 int i;
179 for (i = 1; i <= n; i++) {
181 endp[- i] = colonp[n - i];
182 colonp[n - i] = 0;
183 }
184 tp = endp;
185 }
186 if (tp != endp)
187 return (0);
188 memcpy(dst, tmp, NS_IN6ADDRSZ);
189 return (1);
190}
191#endif
192/* int
194 * isc_net_pton(af, src, dst)
195 * convert from presentation format (which usually means ASCII printable)
196 * to network format (which is usually some kind of binary format).
197 * return:
198 * 1 if the address was valid for the specified address family
199 * 0 if the address wasn't valid (`dst' is untouched in this case)
200 * -1 if some other error occurred (`dst' is untouched in this case, too)
201 * author:
202 * Paul Vixie, 1996.
203 */
204int
205inet_pton(int af, const char *src, void *dst)
206{
207 switch (af) {
208 case AF_INET:
209 return (inet_pton4(src, dst));
210#ifndef NO_IPV6
211 case AF_INET6:
212 return (inet_pton6(src, dst));
213#endif
214 default:
215 errno = EAFNOSUPPORT;
216 return (-1);
217 }
218 /* NOTREACHED */
219}