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