1 /*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996,1999 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 ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 *
17 * $Id: inet_net_pton.c,v 1.8.672.1 2008/08/26 04:42:38 marka Exp $
18 */
19
20 #include "port_before.h"
21
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <arpa/nameser.h>
26 #include <arpa/inet.h>
27
28 #include <assert.h>
29 #include <ctype.h>
30 #include <errno.h>
31 #include <stdio.h>
32 #include <string.h>
33 #include <stdlib.h>
34
35 #include "port_after.h"
36
37 /*%
38 * static int
39 * inet_net_pton_ipv4(src, dst, size)
40 * convert IPv4 network number from presentation to network format.
41 * accepts hex octets, hex strings, decimal octets, and /CIDR.
42 * "size" is in bytes and describes "dst".
43 * return:
44 * number of bits, either imputed classfully or specified with /CIDR,
45 * or -1 if some failure occurred (check errno). ENOENT means it was
46 * not an IPv4 network specification.
47 * note:
48 * network byte order assumed. this means 192.5.5.240/28 has
49 * 0b11110000 in its fourth octet.
50 * author:
51 * Paul Vixie (ISC), June 1996
52 */
53 static int
inet_net_pton_ipv4(const char * src,u_char * dst,size_t size)54 inet_net_pton_ipv4(const char *src, u_char *dst, size_t size) {
55 static const char xdigits[] = "0123456789abcdef";
56 static const char digits[] = "0123456789";
57 int n, ch, tmp = 0, dirty, bits;
58 const u_char *odst = dst;
59
60 ch = *src++;
61 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
62 && isascii((unsigned char)(src[1]))
63 && isxdigit((unsigned char)(src[1]))) {
64 /* Hexadecimal: Eat nybble string. */
65 if (size <= 0U)
66 goto emsgsize;
67 dirty = 0;
68 src++; /*%< skip x or X. */
69 while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch)) {
70 if (isupper(ch))
71 ch = tolower(ch);
72 n = strchr(xdigits, ch) - xdigits;
73 assert(n >= 0 && n <= 15);
74 if (dirty == 0)
75 tmp = n;
76 else
77 tmp = (tmp << 4) | n;
78 if (++dirty == 2) {
79 if (size-- <= 0U)
80 goto emsgsize;
81 *dst++ = (u_char) tmp;
82 dirty = 0;
83 }
84 }
85 if (dirty) { /*%< Odd trailing nybble? */
86 if (size-- <= 0U)
87 goto emsgsize;
88 *dst++ = (u_char) (tmp << 4);
89 }
90 } else if (isascii(ch) && isdigit(ch)) {
91 /* Decimal: eat dotted digit string. */
92 for (;;) {
93 tmp = 0;
94 do {
95 n = strchr(digits, ch) - digits;
96 assert(n >= 0 && n <= 9);
97 tmp *= 10;
98 tmp += n;
99 if (tmp > 255)
100 goto enoent;
101 } while ((ch = *src++) != '\0' &&
102 isascii(ch) && isdigit(ch));
103 if (size-- <= 0U)
104 goto emsgsize;
105 *dst++ = (u_char) tmp;
106 if (ch == '\0' || ch == '/')
107 break;
108 if (ch != '.')
109 goto enoent;
110 ch = *src++;
111 if (!isascii(ch) || !isdigit(ch))
112 goto enoent;
113 }
114 } else
115 goto enoent;
116
117 bits = -1;
118 if (ch == '/' && isascii((unsigned char)(src[0])) &&
119 isdigit((unsigned char)(src[0])) && dst > odst) {
120 /* CIDR width specifier. Nothing can follow it. */
121 ch = *src++; /*%< Skip over the /. */
122 bits = 0;
123 do {
124 n = strchr(digits, ch) - digits;
125 assert(n >= 0 && n <= 9);
126 bits *= 10;
127 bits += n;
128 if (bits > 32)
129 goto enoent;
130 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
131 if (ch != '\0')
132 goto enoent;
133 }
134
135 /* Firey death and destruction unless we prefetched EOS. */
136 if (ch != '\0')
137 goto enoent;
138
139 /* If nothing was written to the destination, we found no address. */
140 if (dst == odst)
141 goto enoent;
142 /* If no CIDR spec was given, infer width from net class. */
143 if (bits == -1) {
144 if (*odst >= 240) /*%< Class E */
145 bits = 32;
146 else if (*odst >= 224) /*%< Class D */
147 bits = 8;
148 else if (*odst >= 192) /*%< Class C */
149 bits = 24;
150 else if (*odst >= 128) /*%< Class B */
151 bits = 16;
152 else /*%< Class A */
153 bits = 8;
154 /* If imputed mask is narrower than specified octets, widen. */
155 if (bits < ((dst - odst) * 8))
156 bits = (dst - odst) * 8;
157 /*
158 * If there are no additional bits specified for a class D
159 * address adjust bits to 4.
160 */
161 if (bits == 8 && *odst == 224)
162 bits = 4;
163 }
164 /* Extend network to cover the actual mask. */
165 while (bits > ((dst - odst) * 8)) {
166 if (size-- <= 0U)
167 goto emsgsize;
168 *dst++ = '\0';
169 }
170 return (bits);
171
172 enoent:
173 errno = ENOENT;
174 return (-1);
175
176 emsgsize:
177 errno = EMSGSIZE;
178 return (-1);
179 }
180
181 static int
getbits(const char * src,int * bitsp)182 getbits(const char *src, int *bitsp) {
183 static const char digits[] = "0123456789";
184 int n;
185 int val;
186 char ch;
187
188 val = 0;
189 n = 0;
190 while ((ch = *src++) != '\0') {
191 const char *pch;
192
193 pch = strchr(digits, ch);
194 if (pch != NULL) {
195 if (n++ != 0 && val == 0) /*%< no leading zeros */
196 return (0);
197 val *= 10;
198 val += (pch - digits);
199 if (val > 128) /*%< range */
200 return (0);
201 continue;
202 }
203 return (0);
204 }
205 if (n == 0)
206 return (0);
207 *bitsp = val;
208 return (1);
209 }
210
211 static int
getv4(const char * src,u_char * dst,int * bitsp)212 getv4(const char *src, u_char *dst, int *bitsp) {
213 static const char digits[] = "0123456789";
214 u_char *odst = dst;
215 int n;
216 u_int val;
217 char ch;
218
219 val = 0;
220 n = 0;
221 while ((ch = *src++) != '\0') {
222 const char *pch;
223
224 pch = strchr(digits, ch);
225 if (pch != NULL) {
226 if (n++ != 0 && val == 0) /*%< no leading zeros */
227 return (0);
228 val *= 10;
229 val += (pch - digits);
230 if (val > 255) /*%< range */
231 return (0);
232 continue;
233 }
234 if (ch == '.' || ch == '/') {
235 if (dst - odst > 3) /*%< too many octets? */
236 return (0);
237 *dst++ = val;
238 if (ch == '/')
239 return (getbits(src, bitsp));
240 val = 0;
241 n = 0;
242 continue;
243 }
244 return (0);
245 }
246 if (n == 0)
247 return (0);
248 if (dst - odst > 3) /*%< too many octets? */
249 return (0);
250 *dst++ = val;
251 return (1);
252 }
253
254 static int
inet_net_pton_ipv6(const char * src,u_char * dst,size_t size)255 inet_net_pton_ipv6(const char *src, u_char *dst, size_t size) {
256 static const char xdigits_l[] = "0123456789abcdef",
257 xdigits_u[] = "0123456789ABCDEF";
258 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
259 const char *xdigits, *curtok;
260 int ch, saw_xdigit;
261 u_int val;
262 int digits;
263 int bits;
264 size_t bytes;
265 int words;
266 int ipv4;
267
268 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
269 endp = tp + NS_IN6ADDRSZ;
270 colonp = NULL;
271 /* Leading :: requires some special handling. */
272 if (*src == ':')
273 if (*++src != ':')
274 goto enoent;
275 curtok = src;
276 saw_xdigit = 0;
277 val = 0;
278 digits = 0;
279 bits = -1;
280 ipv4 = 0;
281 while ((ch = *src++) != '\0') {
282 const char *pch;
283
284 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
285 pch = strchr((xdigits = xdigits_u), ch);
286 if (pch != NULL) {
287 val <<= 4;
288 val |= (pch - xdigits);
289 if (++digits > 4)
290 goto enoent;
291 saw_xdigit = 1;
292 continue;
293 }
294 if (ch == ':') {
295 curtok = src;
296 if (!saw_xdigit) {
297 if (colonp)
298 goto enoent;
299 colonp = tp;
300 continue;
301 } else if (*src == '\0')
302 goto enoent;
303 if (tp + NS_INT16SZ > endp)
304 return (0);
305 *tp++ = (u_char) (val >> 8) & 0xff;
306 *tp++ = (u_char) val & 0xff;
307 saw_xdigit = 0;
308 digits = 0;
309 val = 0;
310 continue;
311 }
312 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
313 getv4(curtok, tp, &bits) > 0) {
314 tp += NS_INADDRSZ;
315 saw_xdigit = 0;
316 ipv4 = 1;
317 break; /*%< '\\0' was seen by inet_pton4(). */
318 }
319 if (ch == '/' && getbits(src, &bits) > 0)
320 break;
321 goto enoent;
322 }
323 if (saw_xdigit) {
324 if (tp + NS_INT16SZ > endp)
325 goto enoent;
326 *tp++ = (u_char) (val >> 8) & 0xff;
327 *tp++ = (u_char) val & 0xff;
328 }
329 if (bits == -1)
330 bits = 128;
331
332 words = (bits + 15) / 16;
333 if (words < 2)
334 words = 2;
335 if (ipv4)
336 words = 8;
337 endp = tmp + 2 * words;
338
339 if (colonp != NULL) {
340 /*
341 * Since some memmove()'s erroneously fail to handle
342 * overlapping regions, we'll do the shift by hand.
343 */
344 const int n = tp - colonp;
345 int i;
346
347 if (tp == endp)
348 goto enoent;
349 for (i = 1; i <= n; i++) {
350 endp[- i] = colonp[n - i];
351 colonp[n - i] = 0;
352 }
353 tp = endp;
354 }
355 if (tp != endp)
356 goto enoent;
357
358 bytes = (bits + 7) / 8;
359 if (bytes > size)
360 goto emsgsize;
361 memcpy(dst, tmp, bytes);
362 return (bits);
363
364 enoent:
365 errno = ENOENT;
366 return (-1);
367
368 emsgsize:
369 errno = EMSGSIZE;
370 return (-1);
371 }
372
373 /*%
374 * int
375 * inet_net_pton(af, src, dst, size)
376 * convert network number from presentation to network format.
377 * accepts hex octets, hex strings, decimal octets, and /CIDR.
378 * "size" is in bytes and describes "dst".
379 * return:
380 * number of bits, either imputed classfully or specified with /CIDR,
381 * or -1 if some failure occurred (check errno). ENOENT means it was
382 * not a valid network specification.
383 * author:
384 * Paul Vixie (ISC), June 1996
385 */
386 int
inet_net_pton(int af,const char * src,void * dst,size_t size)387 inet_net_pton(int af, const char *src, void *dst, size_t size) {
388 switch (af) {
389 case AF_INET:
390 return (inet_net_pton_ipv4(src, dst, size));
391 case AF_INET6:
392 return (inet_net_pton_ipv6(src, dst, size));
393 default:
394 errno = EAFNOSUPPORT;
395 return (-1);
396 }
397 }
398
399 /*
400 * Weak aliases for applications that use certain private entry points,
401 * and fail to include <arpa/inet.h>.
402 */
403 #undef inet_net_pton
404 __weak_reference(__inet_net_pton, inet_net_pton);
405