1 /* $NetBSD: inet_pton.c,v 1.6.10.1 2011/01/10 00:42:17 riz Exp $ */
2
3 /*
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1996,1999 by Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <sys/cdefs.h>
21 #if defined(LIBC_SCCS) && !defined(lint)
22 #if 0
23 static const char rcsid[] = "Id: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp";
24 #else
25 __RCSID("$NetBSD: inet_pton.c,v 1.6.10.1 2011/01/10 00:42:17 riz Exp $");
26 #endif
27 #endif /* LIBC_SCCS and not lint */
28
29 // BEGIN android-added
30 #define _DIAGASSERT(exp) assert(exp)
31 #include "../private/arpa_nameser.h"
32 // END android-added
33
34 // android-removed: #include "port_before.h"
35
36 // android-removed: #include "namespace.h"
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/socket.h>
40 #include <netinet/in.h>
41 #include <arpa/inet.h>
42 #include <arpa/nameser.h>
43 #include <string.h>
44 #include <assert.h>
45 #include <ctype.h>
46 #include <errno.h>
47
48 // android-removed: #include "port_after.h"
49
50 // BEGIN android-removed
51 // #ifdef __weak_alias
52 // __weak_alias(inet_pton,_inet_pton)
53 // #endif
54 // END android-removed
55
56 /*%
57 * WARNING: Don't even consider trying to compile this on a system where
58 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
59 */
60
61 static int inet_pton4(const char *src, u_char *dst, int pton);
62 static int inet_pton6(const char *src, u_char *dst);
63
64 /* int
65 * inet_pton(af, src, dst)
66 * convert from presentation format (which usually means ASCII printable)
67 * to network format (which is usually some kind of binary format).
68 * return:
69 * 1 if the address was valid for the specified address family
70 * 0 if the address wasn't valid (`dst' is untouched in this case)
71 * -1 if some other error occurred (`dst' is untouched in this case, too)
72 * author:
73 * Paul Vixie, 1996.
74 */
75 int
inet_pton(int af,const char * src,void * dst)76 inet_pton(int af, const char *src, void *dst)
77 {
78
79 _DIAGASSERT(src != NULL);
80 _DIAGASSERT(dst != NULL);
81
82 switch (af) {
83 case AF_INET:
84 return (inet_pton4(src, dst, 1));
85 case AF_INET6:
86 return (inet_pton6(src, dst));
87 default:
88 errno = EAFNOSUPPORT;
89 return (-1);
90 }
91 /* NOTREACHED */
92 }
93
94 /* int
95 * inet_pton4(src, dst, pton)
96 * when last arg is 0: inet_aton(). with hexadecimal, octal and shorthand.
97 * when last arg is 1: inet_pton(). decimal dotted-quad only.
98 * return:
99 * 1 if `src' is a valid input, else 0.
100 * notice:
101 * does not touch `dst' unless it's returning 1.
102 * author:
103 * Paul Vixie, 1996.
104 */
105 static int
inet_pton4(const char * src,u_char * dst,int pton)106 inet_pton4(const char *src, u_char *dst, int pton)
107 {
108 u_int32_t val;
109 u_int digit, base;
110 int n;
111 unsigned char c;
112 u_int parts[4];
113 register u_int *pp = parts;
114
115 _DIAGASSERT(src != NULL);
116 _DIAGASSERT(dst != NULL);
117
118 c = *src;
119 for (;;) {
120 /*
121 * Collect number up to ``.''.
122 * Values are specified as for C:
123 * 0x=hex, 0=octal, isdigit=decimal.
124 */
125 if (!isdigit(c))
126 return (0);
127 val = 0; base = 10;
128 if (c == '0') {
129 c = *++src;
130 if (c == 'x' || c == 'X')
131 base = 16, c = *++src;
132 else if (isdigit(c) && c != '9')
133 base = 8;
134 }
135 /* inet_pton() takes decimal only */
136 if (pton && base != 10)
137 return (0);
138 for (;;) {
139 if (isdigit(c)) {
140 digit = c - '0';
141 if (digit >= base)
142 break;
143 val = (val * base) + digit;
144 c = *++src;
145 } else if (base == 16 && isxdigit(c)) {
146 digit = c + 10 - (islower(c) ? 'a' : 'A');
147 if (digit >= 16)
148 break;
149 val = (val << 4) | digit;
150 c = *++src;
151 } else
152 break;
153 }
154 if (c == '.') {
155 /*
156 * Internet format:
157 * a.b.c.d
158 * a.b.c (with c treated as 16 bits)
159 * a.b (with b treated as 24 bits)
160 * a (with a treated as 32 bits)
161 */
162 if (pp >= parts + 3)
163 return (0);
164 *pp++ = val;
165 c = *++src;
166 } else
167 break;
168 }
169 /*
170 * Check for trailing characters.
171 */
172 if (c != '\0' && !isspace(c))
173 return (0);
174 /*
175 * Concoct the address according to
176 * the number of parts specified.
177 */
178 n = pp - parts + 1;
179 /* inet_pton() takes dotted-quad only. it does not take shorthand. */
180 if (pton && n != 4)
181 return (0);
182 switch (n) {
183
184 case 0:
185 return (0); /* initial nondigit */
186
187 case 1: /* a -- 32 bits */
188 break;
189
190 case 2: /* a.b -- 8.24 bits */
191 if (parts[0] > 0xff || val > 0xffffff)
192 return (0);
193 val |= parts[0] << 24;
194 break;
195
196 case 3: /* a.b.c -- 8.8.16 bits */
197 if ((parts[0] | parts[1]) > 0xff || val > 0xffff)
198 return (0);
199 val |= (parts[0] << 24) | (parts[1] << 16);
200 break;
201
202 case 4: /* a.b.c.d -- 8.8.8.8 bits */
203 if ((parts[0] | parts[1] | parts[2] | val) > 0xff)
204 return (0);
205 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
206 break;
207 }
208 if (dst) {
209 val = htonl(val);
210 memcpy(dst, &val, NS_INADDRSZ);
211 }
212 return (1);
213 }
214
215 /* int
216 * inet_pton6(src, dst)
217 * convert presentation level address to network order binary form.
218 * return:
219 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
220 * notice:
221 * (1) does not touch `dst' unless it's returning 1.
222 * (2) :: in a full address is silently ignored.
223 * credit:
224 * inspired by Mark Andrews.
225 * author:
226 * Paul Vixie, 1996.
227 */
228 static int
inet_pton6(const char * src,u_char * dst)229 inet_pton6(const char *src, u_char *dst)
230 {
231 static const char xdigits_l[] = "0123456789abcdef",
232 xdigits_u[] = "0123456789ABCDEF";
233 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
234 const char *xdigits, *curtok;
235 int ch, seen_xdigits;
236 u_int val;
237
238 _DIAGASSERT(src != NULL);
239 _DIAGASSERT(dst != NULL);
240
241 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
242 endp = tp + NS_IN6ADDRSZ;
243 colonp = NULL;
244 /* Leading :: requires some special handling. */
245 if (*src == ':')
246 if (*++src != ':')
247 return (0);
248 curtok = src;
249 seen_xdigits = 0;
250 val = 0;
251 while ((ch = *src++) != '\0') {
252 const char *pch;
253
254 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
255 pch = strchr((xdigits = xdigits_u), ch);
256 if (pch != NULL) {
257 val <<= 4;
258 val |= (pch - xdigits);
259 if (++seen_xdigits > 4)
260 return (0);
261 continue;
262 }
263 if (ch == ':') {
264 curtok = src;
265 if (!seen_xdigits) {
266 if (colonp)
267 return (0);
268 colonp = tp;
269 continue;
270 } else if (*src == '\0')
271 return (0);
272 if (tp + NS_INT16SZ > endp)
273 return (0);
274 *tp++ = (u_char) (val >> 8) & 0xff;
275 *tp++ = (u_char) val & 0xff;
276 seen_xdigits = 0;
277 val = 0;
278 continue;
279 }
280 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
281 inet_pton4(curtok, tp, 1) > 0) {
282 tp += NS_INADDRSZ;
283 seen_xdigits = 0;
284 break; /*%< '\\0' was seen by inet_pton4(). */
285 }
286 return (0);
287 }
288 if (seen_xdigits) {
289 if (tp + NS_INT16SZ > endp)
290 return (0);
291 *tp++ = (u_char) (val >> 8) & 0xff;
292 *tp++ = (u_char) val & 0xff;
293 }
294 if (colonp != NULL) {
295 /*
296 * Since some memmove()'s erroneously fail to handle
297 * overlapping regions, we'll do the shift by hand.
298 */
299 const int n = tp - colonp;
300 int i;
301
302 if (tp == endp)
303 return (0);
304 for (i = 1; i <= n; i++) {
305 endp[- i] = colonp[n - i];
306 colonp[n - i] = 0;
307 }
308 tp = endp;
309 }
310 if (tp != endp)
311 return (0);
312 memcpy(dst, tmp, NS_IN6ADDRSZ);
313 return (1);
314 }
315
316 /*! \file */
317