1 /* vi:ai:et:ts=8 sw=2
2 */
3 /*
4 * Copyright (C) 1996-2001 Internet Software Consortium.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
11 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
12 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
13 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
15 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
16 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
17 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include "wzd_all.h"
21
22 #ifndef WZD_USE_PCH
23
24 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #endif
27
28 #if defined(WIN32) || (defined(__CYGWIN__) && defined(WINSOCK_SUPPORT))
29 #include <winsock2.h>
30 #include "wzd_types.h"
31 #else
32 #include <unistd.h>
33 #include <sys/types.h>
34 #include <sys/socket.h>
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
37 #endif
38
39 #include <errno.h>
40
41 #endif /* WZD_USE_PCH */
42
43 #ifndef HAVE_INET_PTON
44
45 #define NS_INT16SZ 2
46 #define NS_INADDRSZ 4
47 #define NS_IN6ADDRSZ 16
48
49 /*
50 * WARNING: Don't even consider trying to compile this on a system where
51 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
52 */
53
54 static int inet_pton4(const char *src, unsigned char *dst);
55 #ifdef IPV6_SUPPORT
56 static int inet_pton6(const char *src, unsigned char *dst);
57 #endif
58
59 /* int
60 * inet_pton(af, src, dst)
61 * convert from presentation format (which usually means ASCII printable)
62 * to network format (which is usually some kind of binary format).
63 * return:
64 * 1 if the address was valid for the specified address family
65 * 0 if the address wasn't valid (`dst' is untouched in this case)
66 * -1 if some other error occurred (`dst' is untouched in this case, too)
67 * author:
68 * Paul Vixie, 1996.
69 */
70 int
inet_pton(int af,const char * src,void * dst)71 inet_pton(int af,
72 const char *src,
73 void *dst)
74 {
75 switch (af) {
76 case AF_INET:
77 return (inet_pton4(src, dst));
78 #ifdef IPV6_SUPPORT
79 case AF_INET6:
80 return (inet_pton6(src, dst));
81 #endif
82 default:
83 errno = EAFNOSUPPORT;
84 return (-1);
85 }
86 /* NOTREACHED */
87 }
88
89 /* int
90 * inet_pton4(src, dst)
91 * like inet_aton() but without all the hexadecimal and shorthand.
92 * return:
93 * 1 if `src' is a valid dotted quad, else 0.
94 * notice:
95 * does not touch `dst' unless it's returning 1.
96 * author:
97 * Paul Vixie, 1996.
98 */
99 static int
inet_pton4(src,dst)100 inet_pton4(src, dst)
101 const char *src;
102 unsigned char *dst;
103 {
104 static const char digits[] = "0123456789";
105 int saw_digit, octets, ch;
106 unsigned char tmp[NS_INADDRSZ], *tp;
107
108 saw_digit = 0;
109 octets = 0;
110 *(tp = tmp) = 0;
111 while ((ch = *src++) != '\0') {
112 const char *pch;
113
114 if ((pch = strchr(digits, ch)) != NULL) {
115 unsigned int new = *tp * 10 + (pch - digits);
116
117 if (new > 255)
118 return (0);
119 *tp = new;
120 if (! saw_digit) {
121 if (++octets > 4)
122 return (0);
123 saw_digit = 1;
124 }
125 } else if (ch == '.' && saw_digit) {
126 if (octets == 4)
127 return (0);
128 *++tp = 0;
129 saw_digit = 0;
130 } else
131 return (0);
132 }
133 if (octets < 4)
134 return (0);
135 memcpy(dst, tmp, NS_INADDRSZ);
136 return (1);
137 }
138
139 /* int
140 * inet_pton6(src, dst)
141 * convert presentation level address to network order binary form.
142 * return:
143 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
144 * notice:
145 * (1) does not touch `dst' unless it's returning 1.
146 * (2) :: in a full address is silently ignored.
147 * credit:
148 * inspired by Mark Andrews.
149 * author:
150 * Paul Vixie, 1996.
151 */
152 #ifdef IPV6_SUPPORT
153 static int
inet_pton6(src,dst)154 inet_pton6(src, dst)
155 const char *src;
156 unsigned char *dst;
157 {
158 static const char xdigits_l[] = "0123456789abcdef",
159 xdigits_u[] = "0123456789ABCDEF";
160 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
161 const char *xdigits, *curtok;
162 int ch, saw_xdigit;
163 unsigned int val;
164
165 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
166 endp = tp + NS_IN6ADDRSZ;
167 colonp = NULL;
168 /* Leading :: requires some special handling. */
169 if (*src == ':')
170 if (*++src != ':')
171 return (0);
172 curtok = src;
173 saw_xdigit = 0;
174 val = 0;
175 while ((ch = *src++) != '\0') {
176 const char *pch;
177
178 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
179 pch = strchr((xdigits = xdigits_u), ch);
180 if (pch != NULL) {
181 val <<= 4;
182 val |= (pch - xdigits);
183 if (val > 0xffff)
184 return (0);
185 saw_xdigit = 1;
186 continue;
187 }
188 if (ch == ':') {
189 curtok = src;
190 if (!saw_xdigit) {
191 if (colonp)
192 return (0);
193 colonp = tp;
194 continue;
195 }
196 if (tp + NS_INT16SZ > endp)
197 return (0);
198 *tp++ = (unsigned char) (val >> 8) & 0xff;
199 *tp++ = (unsigned char) val & 0xff;
200 saw_xdigit = 0;
201 val = 0;
202 continue;
203 }
204 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
205 inet_pton4(curtok, tp) > 0) {
206 tp += NS_INADDRSZ;
207 saw_xdigit = 0;
208 break; /* '\0' was seen by inet_pton4(). */
209 }
210 return (0);
211 }
212 if (saw_xdigit) {
213 if (tp + NS_INT16SZ > endp)
214 return (0);
215 *tp++ = (unsigned char) (val >> 8) & 0xff;
216 *tp++ = (unsigned char) val & 0xff;
217 }
218 if (colonp != NULL) {
219 /*
220 * Since some memmove()'s erroneously fail to handle
221 * overlapping regions, we'll do the shift by hand.
222 */
223 const int n = tp - colonp;
224 int i;
225
226 for (i = 1; i <= n; i++) {
227 endp[- i] = colonp[n - i];
228 colonp[n - i] = 0;
229 }
230 tp = endp;
231 }
232 if (tp != endp)
233 return (0);
234 memcpy(dst, tmp, NS_IN6ADDRSZ);
235 return (1);
236 }
237 #endif
238
239 #endif /* HAVE_INET_PTON */
240