freshlybakedca.ke
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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
18#include "../git-compat-util.h"
19
20#ifndef NS_INT16SZ
21#define NS_INT16SZ 2
22#endif
23
24#ifndef NS_INADDRSZ
25#define NS_INADDRSZ 4
26#endif
27
28#ifndef NS_IN6ADDRSZ
29#define NS_IN6ADDRSZ 16
30#endif
31
32/*
33 * WARNING: Don't even consider trying to compile this on a system where
34 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
35 */
36
37static int inet_pton4(const char *src, unsigned char *dst);
38#ifndef NO_IPV6
39static int inet_pton6(const char *src, unsigned char *dst);
40#endif
41
42/* int
43 * inet_pton4(src, dst)
44 * like inet_aton() but without all the hexadecimal and shorthand.
45 * return:
46 * 1 if `src' is a valid dotted quad, else 0.
47 * notice:
48 * does not touch `dst' unless it's returning 1.
49 * author:
50 * Paul Vixie, 1996.
51 */
52static int
53inet_pton4(const char *src, unsigned char *dst)
54{
55 static const char digits[] = "0123456789";
56 int saw_digit, octets, ch;
57 unsigned char tmp[NS_INADDRSZ], *tp;
58
59 saw_digit = 0;
60 octets = 0;
61 *(tp = tmp) = 0;
62 while ((ch = *src++) != '\0') {
63 const char *pch;
64
65 if ((pch = strchr(digits, ch)) != NULL) {
66 unsigned int new = *tp * 10 + (pch - digits);
67
68 if (new > 255)
69 return (0);
70 *tp = new;
71 if (! saw_digit) {
72 if (++octets > 4)
73 return (0);
74 saw_digit = 1;
75 }
76 } else if (ch == '.' && saw_digit) {
77 if (octets == 4)
78 return (0);
79 *++tp = 0;
80 saw_digit = 0;
81 } else
82 return (0);
83 }
84 if (octets < 4)
85 return (0);
86 memcpy(dst, tmp, NS_INADDRSZ);
87 return (1);
88}
89
90/* int
91 * inet_pton6(src, dst)
92 * convert presentation level address to network order binary form.
93 * return:
94 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
95 * notice:
96 * (1) does not touch `dst' unless it's returning 1.
97 * (2) :: in a full address is silently ignored.
98 * credit:
99 * inspired by Mark Andrews.
100 * author:
101 * Paul Vixie, 1996.
102 */
103
104#ifndef NO_IPV6
105static int
106inet_pton6(const char *src, unsigned char *dst)
107{
108 static const char xdigits_l[] = "0123456789abcdef",
109 xdigits_u[] = "0123456789ABCDEF";
110 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
111 const char *xdigits, *curtok;
112 int ch, saw_xdigit;
113 unsigned int val;
114
115 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
116 endp = tp + NS_IN6ADDRSZ;
117 colonp = NULL;
118 /* Leading :: requires some special handling. */
119 if (*src == ':')
120 if (*++src != ':')
121 return (0);
122 curtok = src;
123 saw_xdigit = 0;
124 val = 0;
125 while ((ch = *src++) != '\0') {
126 const char *pch;
127
128 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
129 pch = strchr((xdigits = xdigits_u), ch);
130 if (pch != NULL) {
131 val <<= 4;
132 val |= (pch - xdigits);
133 if (val > 0xffff)
134 return (0);
135 saw_xdigit = 1;
136 continue;
137 }
138 if (ch == ':') {
139 curtok = src;
140 if (!saw_xdigit) {
141 if (colonp)
142 return (0);
143 colonp = tp;
144 continue;
145 }
146 if (tp + NS_INT16SZ > endp)
147 return (0);
148 *tp++ = (unsigned char) (val >> 8) & 0xff;
149 *tp++ = (unsigned char) val & 0xff;
150 saw_xdigit = 0;
151 val = 0;
152 continue;
153 }
154 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
155 inet_pton4(curtok, tp) > 0) {
156 tp += NS_INADDRSZ;
157 saw_xdigit = 0;
158 break; /* '\0' was seen by inet_pton4(). */
159 }
160 return (0);
161 }
162 if (saw_xdigit) {
163 if (tp + NS_INT16SZ > endp)
164 return (0);
165 *tp++ = (unsigned char) (val >> 8) & 0xff;
166 *tp++ = (unsigned char) val & 0xff;
167 }
168 if (colonp != NULL) {
169 /*
170 * Since some memmove()'s erroneously fail to handle
171 * overlapping regions, we'll do the shift by hand.
172 */
173 const int n = tp - colonp;
174 int i;
175
176 for (i = 1; i <= n; i++) {
177 endp[- i] = colonp[n - i];
178 colonp[n - i] = 0;
179 }
180 tp = endp;
181 }
182 if (tp != endp)
183 return (0);
184 memcpy(dst, tmp, NS_IN6ADDRSZ);
185 return (1);
186}
187#endif
188
189/* int
190 * isc_net_pton(af, src, dst)
191 * convert from presentation format (which usually means ASCII printable)
192 * to network format (which is usually some kind of binary format).
193 * return:
194 * 1 if the address was valid for the specified address family
195 * 0 if the address wasn't valid (`dst' is untouched in this case)
196 * -1 if some other error occurred (`dst' is untouched in this case, too)
197 * author:
198 * Paul Vixie, 1996.
199 */
200int
201inet_pton(int af, const char *src, void *dst)
202{
203 switch (af) {
204 case AF_INET:
205 return (inet_pton4(src, dst));
206#ifndef NO_IPV6
207 case AF_INET6:
208 return (inet_pton6(src, dst));
209#endif
210 default:
211 errno = EAFNOSUPPORT;
212 return (-1);
213 }
214 /* NOTREACHED */
215}