/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following functions.
- inet_pton
- inet_pton4
- inet_pton6
1 /* $NetBSD: inet_pton.c,v 1.16 2000/02/07 18:51:02 itojun Exp $ */
2
3 /* Copyright (c) 1996 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
10 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
11 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
12 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
15 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
16 * SOFTWARE.
17 */
18
19 /*#include <sys/cdefs.h>*/
20 #define __P(a) a
21
22 #if defined(LIBC_SCCS) && !defined(lint)
23 #if 0
24 static char rcsid[] = "Id: inet_pton.c,v 8.7 1996/08/05 08:31:35 vixie Exp ";
25 #else
26 __RCSID("$NetBSD: inet_pton.c,v 1.16 2000/02/07 18:51:02 itojun Exp $");
27 #endif
28 #endif /* LIBC_SCCS and not lint */
29
30 /*#include "namespace.h"*/
31 #include <sys/param.h>
32 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
36 #include <arpa/nameser.h>
37
38 #include <assert.h>
39 #include <ctype.h>
40 #include <errno.h>
41 #include <stdlib.h>
42 #include <string.h>
43
44 #include "inet6def.h"
45
46 /*
47 * WARNING: Don't even consider trying to compile this on a system where
48 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
49 */
50
51 static int inet_pton4 __P((const char *src, u_char *dst, int pton));
52 static int inet_pton6 __P((const char *src, u_char *dst));
53
54 /* int
55 * inet_pton(af, src, dst)
56 * convert from presentation format (which usually means ASCII printable)
57 * to network format (which is usually some kind of binary format).
58 * return:
59 * 1 if the address was valid for the specified address family
60 * 0 if the address wasn't valid (`dst' is untouched in this case)
61 * -1 if some other error occurred (`dst' is untouched in this case, too)
62 * author:
63 * Paul Vixie, 1996.
64 */
65 int
66 inet_pton(af, src, dst)
/* [<][>][^][v][top][bottom][index][help] */
67 int af;
68 const char *src;
69 void *dst;
70 {
71
72 if(src == NULL || dst == NULL) {
73 return 0;
74 }
75
76 switch (af) {
77 case AF_INET:
78 return (inet_pton4(src, dst, 1));
79 case AF_INET6:
80 return (inet_pton6(src, dst));
81 default:
82 errno = EAFNOSUPPORT;
83 return (-1);
84 }
85 /* NOTREACHED */
86 }
87
88 /* int
89 * inet_pton4(src, dst, pton)
90 * when last arg is 0: inet_aton(). with hexadecimal, octal and shorthand.
91 * when last arg is 1: inet_pton(). decimal dotted-quad only.
92 * return:
93 * 1 if `src' is a valid input, else 0.
94 * notice:
95 * does not touch `dst' unless it's returning 1.
96 * author:
97 * Paul Vixie, 1996.
98 */
99 static int
100 inet_pton4(src, dst, pton)
/* [<][>][^][v][top][bottom][index][help] */
101 const char *src;
102 u_char *dst;
103 int pton;
104 {
105 uint32_t val;
106 u_int digit;
107 int base, n;
108 unsigned char c;
109 u_int parts[4];
110 register u_int *pp = parts;
111
112 if(src == NULL || dst == NULL) {
113 return 0;
114 }
115
116 c = *src;
117 for (;;) {
118 /*
119 * Collect number up to ``.''.
120 * Values are specified as for C:
121 * 0x=hex, 0=octal, isdigit=decimal.
122 */
123 if (!isdigit(c))
124 return (0);
125 val = 0; base = 10;
126 if (c == '0') {
127 c = *++src;
128 if (c == 'x' || c == 'X')
129 base = 16, c = *++src;
130 else if (isdigit(c) && c != '9')
131 base = 8;
132 }
133 /* inet_pton() takes decimal only */
134 if (pton && base != 10)
135 return (0);
136 for (;;) {
137 if (isdigit(c)) {
138 digit = c - '0';
139 if (digit >= base)
140 break;
141 val = (val * base) + digit;
142 c = *++src;
143 } else if (base == 16 && isxdigit(c)) {
144 digit = c + 10 - (islower(c) ? 'a' : 'A');
145 if (digit >= 16)
146 break;
147 val = (val << 4) | digit;
148 c = *++src;
149 } else
150 break;
151 }
152 if (c == '.') {
153 /*
154 * Internet format:
155 * a.b.c.d
156 * a.b.c (with c treated as 16 bits)
157 * a.b (with b treated as 24 bits)
158 * a (with a treated as 32 bits)
159 */
160 if (pp >= parts + 3)
161 return (0);
162 *pp++ = val;
163 c = *++src;
164 } else
165 break;
166 }
167 /*
168 * Check for trailing characters.
169 */
170 if (c != '\0' && !isspace(c))
171 return (0);
172 /*
173 * Concoct the address according to
174 * the number of parts specified.
175 */
176 n = pp - parts + 1;
177 /* inet_pton() takes dotted-quad only. it does not take shorthand. */
178 if (pton && n != 4)
179 return (0);
180 switch (n) {
181
182 case 0:
183 return (0); /* initial nondigit */
184
185 case 1: /* a -- 32 bits */
186 break;
187
188 case 2: /* a.b -- 8.24 bits */
189 if (parts[0] > 0xff || val > 0xffffff)
190 return (0);
191 val |= parts[0] << 24;
192 break;
193
194 case 3: /* a.b.c -- 8.8.16 bits */
195 if ((parts[0] | parts[1]) > 0xff || val > 0xffff)
196 return (0);
197 val |= (parts[0] << 24) | (parts[1] << 16);
198 break;
199
200 case 4: /* a.b.c.d -- 8.8.8.8 bits */
201 if ((parts[0] | parts[1] | parts[2] | val) > 0xff)
202 return (0);
203 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
204 break;
205 }
206 if (dst) {
207 val = htonl(val);
208 memcpy(dst, &val, INADDRSZ);
209 }
210 return (1);
211 }
212
213 /* int
214 * inet_pton6(src, dst)
215 * convert presentation level address to network order binary form.
216 * return:
217 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
218 * notice:
219 * (1) does not touch `dst' unless it's returning 1.
220 * (2) :: in a full address is silently ignored.
221 * credit:
222 * inspired by Mark Andrews.
223 * author:
224 * Paul Vixie, 1996.
225 */
226 static int
227 inet_pton6(src, dst)
/* [<][>][^][v][top][bottom][index][help] */
228 const char *src;
229 u_char *dst;
230 {
231 static const char xdigits_l[] = "0123456789abcdef",
232 xdigits_u[] = "0123456789ABCDEF";
233 u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
234 const char *xdigits, *curtok;
235 int ch, saw_xdigit;
236 u_int val;
237
238 if(src == NULL || dst == NULL) {
239 return 0;
240 }
241
242 memset((tp = tmp), '\0', IN6ADDRSZ);
243 endp = tp + IN6ADDRSZ;
244 colonp = NULL;
245 /* Leading :: requires some special handling. */
246 if (*src == ':')
247 if (*++src != ':')
248 return (0);
249 curtok = src;
250 saw_xdigit = 0;
251 val = 0;
252 while ((ch = *src++) != '\0') {
253 const char *pch;
254
255 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
256 pch = strchr((xdigits = xdigits_u), ch);
257 if (pch != NULL) {
258 val <<= 4;
259 val |= (pch - xdigits);
260 if (val > 0xffff)
261 return (0);
262 saw_xdigit = 1;
263 continue;
264 }
265 if (ch == ':') {
266 curtok = src;
267 if (!saw_xdigit) {
268 if (colonp)
269 return (0);
270 colonp = tp;
271 continue;
272 } else if (*src == '\0')
273 return (0);
274 if (tp + INT16SZ > endp)
275 return (0);
276 *tp++ = (u_char) (val >> 8) & 0xff;
277 *tp++ = (u_char) val & 0xff;
278 saw_xdigit = 0;
279 val = 0;
280 continue;
281 }
282 if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
283 inet_pton4(curtok, tp, 1) > 0) {
284 tp += INADDRSZ;
285 saw_xdigit = 0;
286 break; /* '\0' was seen by inet_pton4(). */
287 }
288 return (0);
289 }
290 if (saw_xdigit) {
291 if (tp + INT16SZ > endp)
292 return (0);
293 *tp++ = (u_char) (val >> 8) & 0xff;
294 *tp++ = (u_char) val & 0xff;
295 }
296 if (colonp != NULL) {
297 /*
298 * Since some memmove()'s erroneously fail to handle
299 * overlapping regions, we'll do the shift by hand.
300 */
301 const int n = tp - colonp;
302 int i;
303
304 if (tp == endp)
305 return (0);
306 for (i = 1; i <= n; i++) {
307 endp[- i] = colonp[n - i];
308 colonp[n - i] = 0;
309 }
310 tp = endp;
311 }
312 if (tp != endp)
313 return (0);
314 memcpy(dst, tmp, IN6ADDRSZ);
315 return (1);
316 }
317