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 "../git-compat-util.h"
22#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);
44#ifndef NO_IPV6
45static int inet_pton6(const char *src, unsigned char *dst);
46#endif
47/* int
49 * inet_pton4(src, dst)
50 * like inet_aton() but without all the hexadecimal and shorthand.
51 * return:
52 * 1 if `src' is a valid dotted quad, else 0.
53 * notice:
54 * does not touch `dst' unless it's returning 1.
55 * author:
56 * Paul Vixie, 1996.
57 */
58static int
59inet_pton4(const char *src, unsigned char *dst)
60{
61 static const char digits[] = "0123456789";
62 int saw_digit, octets, ch;
63 unsigned char tmp[NS_INADDRSZ], *tp;
64 saw_digit = 0;
66 octets = 0;
67 *(tp = tmp) = 0;
68 while ((ch = *src++) != '\0') {
69 const char *pch;
70 if ((pch = strchr(digits, ch)) != NULL) {
72 unsigned int new = *tp * 10 + (pch - digits);
73 if (new > 255)
75 return (0);
76 *tp = new;
77 if (! saw_digit) {
78 if (++octets > 4)
79 return (0);
80 saw_digit = 1;
81 }
82 } else if (ch == '.' && saw_digit) {
83 if (octets == 4)
84 return (0);
85 *++tp = 0;
86 saw_digit = 0;
87 } else
88 return (0);
89 }
90 if (octets < 4)
91 return (0);
92 memcpy(dst, tmp, NS_INADDRSZ);
93 return (1);
94}
95/* int
97 * inet_pton6(src, dst)
98 * convert presentation level address to network order binary form.
99 * return:
100 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
101 * notice:
102 * (1) does not touch `dst' unless it's returning 1.
103 * (2) :: in a full address is silently ignored.
104 * credit:
105 * inspired by Mark Andrews.
106 * author:
107 * Paul Vixie, 1996.
108 */
109#ifndef NO_IPV6
111static int
112inet_pton6(const char *src, unsigned char *dst)
113{
114 static const char xdigits_l[] = "0123456789abcdef",
115 xdigits_u[] = "0123456789ABCDEF";
116 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
117 const char *xdigits, *curtok;
118 int ch, saw_xdigit;
119 unsigned int val;
120 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
122 endp = tp + NS_IN6ADDRSZ;
123 colonp = NULL;
124 /* Leading :: requires some special handling. */
125 if (*src == ':')
126 if (*++src != ':')
127 return (0);
128 curtok = src;
129 saw_xdigit = 0;
130 val = 0;
131 while ((ch = *src++) != '\0') {
132 const char *pch;
133 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
135 pch = strchr((xdigits = xdigits_u), ch);
136 if (pch != NULL) {
137 val <<= 4;
138 val |= (pch - xdigits);
139 if (val > 0xffff)
140 return (0);
141 saw_xdigit = 1;
142 continue;
143 }
144 if (ch == ':') {
145 curtok = src;
146 if (!saw_xdigit) {
147 if (colonp)
148 return (0);
149 colonp = tp;
150 continue;
151 }
152 if (tp + NS_INT16SZ > endp)
153 return (0);
154 *tp++ = (unsigned char) (val >> 8) & 0xff;
155 *tp++ = (unsigned char) val & 0xff;
156 saw_xdigit = 0;
157 val = 0;
158 continue;
159 }
160 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
161 inet_pton4(curtok, tp) > 0) {
162 tp += NS_INADDRSZ;
163 saw_xdigit = 0;
164 break; /* '\0' was seen by inet_pton4(). */
165 }
166 return (0);
167 }
168 if (saw_xdigit) {
169 if (tp + NS_INT16SZ > endp)
170 return (0);
171 *tp++ = (unsigned char) (val >> 8) & 0xff;
172 *tp++ = (unsigned char) val & 0xff;
173 }
174 if (colonp != NULL) {
175 /*
176 * Since some memmove()'s erroneously fail to handle
177 * overlapping regions, we'll do the shift by hand.
178 */
179 const int n = tp - colonp;
180 int i;
181 for (i = 1; i <= n; i++) {
183 endp[- i] = colonp[n - i];
184 colonp[n - i] = 0;
185 }
186 tp = endp;
187 }
188 if (tp != endp)
189 return (0);
190 memcpy(dst, tmp, NS_IN6ADDRSZ);
191 return (1);
192}
193#endif
194/* int
196 * isc_net_pton(af, src, dst)
197 * convert from presentation format (which usually means ASCII printable)
198 * to network format (which is usually some kind of binary format).
199 * return:
200 * 1 if the address was valid for the specified address family
201 * 0 if the address wasn't valid (`dst' is untouched in this case)
202 * -1 if some other error occurred (`dst' is untouched in this case, too)
203 * author:
204 * Paul Vixie, 1996.
205 */
206int
207inet_pton(int af, const char *src, void *dst)
208{
209 switch (af) {
210 case AF_INET:
211 return (inet_pton4(src, dst));
212#ifndef NO_IPV6
213 case AF_INET6:
214 return (inet_pton6(src, dst));
215#endif
216 default:
217 errno = EAFNOSUPPORT;
218 return (-1);
219 }
220 /* NOTREACHED */
221}