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 <sys/socket.h>
22#include <netinet/in.h>
23#include <arpa/inet.h>
24#include <stdio.h>
25#include <string.h>
26#ifndef NS_INT16SZ
28#define NS_INT16SZ 2
29#endif
30#ifndef NS_INADDRSZ
32#define NS_INADDRSZ 4
33#endif
34#ifndef NS_IN6ADDRSZ
36#define NS_IN6ADDRSZ 16
37#endif
38/*
40 * WARNING: Don't even consider trying to compile this on a system where
41 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
42 */
43static int inet_pton4(const char *src, unsigned char *dst);
45static int inet_pton6(const char *src, unsigned char *dst);
46/* int
48 * inet_pton4(src, dst)
49 * like inet_aton() but without all the hexadecimal and shorthand.
50 * return:
51 * 1 if `src' is a valid dotted quad, else 0.
52 * notice:
53 * does not touch `dst' unless it's returning 1.
54 * author:
55 * Paul Vixie, 1996.
56 */
57static int
58inet_pton4(const char *src, unsigned char *dst)
59{
60 static const char digits[] = "0123456789";
61 int saw_digit, octets, ch;
62 unsigned char tmp[NS_INADDRSZ], *tp;
63 saw_digit = 0;
65 octets = 0;
66 *(tp = tmp) = 0;
67 while ((ch = *src++) != '\0') {
68 const char *pch;
69 if ((pch = strchr(digits, ch)) != NULL) {
71 unsigned int new = *tp * 10 + (pch - digits);
72 if (new > 255)
74 return (0);
75 *tp = new;
76 if (! saw_digit) {
77 if (++octets > 4)
78 return (0);
79 saw_digit = 1;
80 }
81 } else if (ch == '.' && saw_digit) {
82 if (octets == 4)
83 return (0);
84 *++tp = 0;
85 saw_digit = 0;
86 } else
87 return (0);
88 }
89 if (octets < 4)
90 return (0);
91 memcpy(dst, tmp, NS_INADDRSZ);
92 return (1);
93}
94/* int
96 * inet_pton6(src, dst)
97 * convert presentation level address to network order binary form.
98 * return:
99 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
100 * notice:
101 * (1) does not touch `dst' unless it's returning 1.
102 * (2) :: in a full address is silently ignored.
103 * credit:
104 * inspired by Mark Andrews.
105 * author:
106 * Paul Vixie, 1996.
107 */
108#ifndef NO_IPV6
110static int
111inet_pton6(const char *src, unsigned char *dst)
112{
113 static const char xdigits_l[] = "0123456789abcdef",
114 xdigits_u[] = "0123456789ABCDEF";
115 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
116 const char *xdigits, *curtok;
117 int ch, saw_xdigit;
118 unsigned int val;
119 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
121 endp = tp + NS_IN6ADDRSZ;
122 colonp = NULL;
123 /* Leading :: requires some special handling. */
124 if (*src == ':')
125 if (*++src != ':')
126 return (0);
127 curtok = src;
128 saw_xdigit = 0;
129 val = 0;
130 while ((ch = *src++) != '\0') {
131 const char *pch;
132 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
134 pch = strchr((xdigits = xdigits_u), ch);
135 if (pch != NULL) {
136 val <<= 4;
137 val |= (pch - xdigits);
138 if (val > 0xffff)
139 return (0);
140 saw_xdigit = 1;
141 continue;
142 }
143 if (ch == ':') {
144 curtok = src;
145 if (!saw_xdigit) {
146 if (colonp)
147 return (0);
148 colonp = tp;
149 continue;
150 }
151 if (tp + NS_INT16SZ > endp)
152 return (0);
153 *tp++ = (unsigned char) (val >> 8) & 0xff;
154 *tp++ = (unsigned char) val & 0xff;
155 saw_xdigit = 0;
156 val = 0;
157 continue;
158 }
159 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
160 inet_pton4(curtok, tp) > 0) {
161 tp += NS_INADDRSZ;
162 saw_xdigit = 0;
163 break; /* '\0' was seen by inet_pton4(). */
164 }
165 return (0);
166 }
167 if (saw_xdigit) {
168 if (tp + NS_INT16SZ > endp)
169 return (0);
170 *tp++ = (unsigned char) (val >> 8) & 0xff;
171 *tp++ = (unsigned char) val & 0xff;
172 }
173 if (colonp != NULL) {
174 /*
175 * Since some memmove()'s erroneously fail to handle
176 * overlapping regions, we'll do the shift by hand.
177 */
178 const int n = tp - colonp;
179 int i;
180 for (i = 1; i <= n; i++) {
182 endp[- i] = colonp[n - i];
183 colonp[n - i] = 0;
184 }
185 tp = endp;
186 }
187 if (tp != endp)
188 return (0);
189 memcpy(dst, tmp, NS_IN6ADDRSZ);
190 return (1);
191}
192#endif
193/* int
195 * isc_net_pton(af, src, dst)
196 * convert from presentation format (which usually means ASCII printable)
197 * to network format (which is usually some kind of binary format).
198 * return:
199 * 1 if the address was valid for the specified address family
200 * 0 if the address wasn't valid (`dst' is untouched in this case)
201 * -1 if some other error occurred (`dst' is untouched in this case, too)
202 * author:
203 * Paul Vixie, 1996.
204 */
205int
206inet_pton(int af, const char *src, void *dst)
207{
208 switch (af) {
209 case AF_INET:
210 return (inet_pton4(src, dst));
211#ifndef NO_IPV6
212 case AF_INET6:
213 return (inet_pton6(src, dst));
214#endif
215 default:
216 errno = EAFNOSUPPORT;
217 return (-1);
218 }
219 /* NOTREACHED */
220}