1 /* $NetBSD: inet_net_pton.c,v 1.4 2008/09/21 16:35:25 lukem Exp $ */
2 /* from NetBSD: inet_net_pton.c,v 1.1 2004/05/20 23:13:02 christos Exp */
3
4 /*
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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
12 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
14 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
15 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
16 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
17 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
18 * SOFTWARE.
19 */
20
21 #include "tnftpd.h"
22
23
24 #ifdef SPRINTF_CHAR
25 # define SPRINTF(x) strlen(sprintf/**/x)
26 #else
27 # define SPRINTF(x) ((size_t)sprintf x)
28 #endif
29
30
31 /*
32 * static int
33 * inet_net_pton_ipv4(src, dst, size)
34 * convert IPv4 network number from presentation to network format.
35 * accepts hex octets, hex strings, decimal octets, and /CIDR.
36 * "size" is in bytes and describes "dst".
37 * return:
38 * number of bits, either imputed classfully or specified with /CIDR,
39 * or -1 if some failure occurred (check errno). ENOENT means it was
40 * not an IPv4 network specification.
41 * note:
42 * network byte order assumed. this means 192.5.5.240/28 has
43 * 0b11110000 in its fourth octet.
44 * author:
45 * Paul Vixie (ISC), June 1996
46 */
47 static int
inet_net_pton_ipv4(const char * src,unsigned char * dst,size_t size)48 inet_net_pton_ipv4( const char *src, unsigned char *dst, size_t size) {
49 static const char xdigits[] = "0123456789abcdef";
50 static const char digits[] = "0123456789";
51 int n, ch, tmp = 0, dirty, bits;
52 const unsigned char *odst = dst;
53
54 ch = *src++;
55 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
56 && isascii((unsigned char)(src[1]))
57 && isxdigit((unsigned char)(src[1]))) {
58 /* Hexadecimal: Eat nybble string. */
59 if (size == 0)
60 goto emsgsize;
61 dirty = 0;
62 src++; /* skip x or X. */
63 while ((ch = *src++) != '\0' && isascii((unsigned char)ch)
64 && isxdigit((unsigned char)ch)) {
65 if (isupper((unsigned char)ch))
66 ch = tolower((unsigned char)ch);
67 n = strchr(xdigits, ch) - xdigits;
68 if (dirty == 0)
69 tmp = n;
70 else
71 tmp = (tmp << 4) | n;
72 if (++dirty == 2) {
73 if (size-- == 0)
74 goto emsgsize;
75 *dst++ = (unsigned char) tmp;
76 dirty = 0;
77 }
78 }
79 if (dirty) { /* Odd trailing nybble? */
80 if (size-- == 0)
81 goto emsgsize;
82 *dst++ = (unsigned char) (tmp << 4);
83 }
84 } else if (isascii((unsigned char)ch) && isdigit((unsigned char)ch)) {
85 /* Decimal: eat dotted digit string. */
86 for (;;) {
87 tmp = 0;
88 do {
89 n = strchr(digits, ch) - digits;
90 tmp *= 10;
91 tmp += n;
92 if (tmp > 255)
93 goto enoent;
94 } while ((ch = *src++) != '\0' &&
95 isascii((unsigned char)ch) &&
96 isdigit((unsigned char)ch));
97 if (size-- == 0)
98 goto emsgsize;
99 *dst++ = (unsigned char) tmp;
100 if (ch == '\0' || ch == '/')
101 break;
102 if (ch != '.')
103 goto enoent;
104 ch = *src++;
105 if (!isascii((unsigned char)ch) ||
106 !isdigit((unsigned char)ch))
107 goto enoent;
108 }
109 } else
110 goto enoent;
111
112 bits = -1;
113 if (ch == '/' && isascii((unsigned char)(src[0])) &&
114 isdigit((unsigned char)(src[0])) && dst > odst) {
115 /* CIDR width specifier. Nothing can follow it. */
116 ch = *src++; /* Skip over the /. */
117 bits = 0;
118 do {
119 n = strchr(digits, ch) - digits;
120 bits *= 10;
121 bits += n;
122 } while ((ch = *src++) != '\0' && isascii((unsigned char)ch)
123 && isdigit((unsigned char)ch));
124 if (ch != '\0')
125 goto enoent;
126 if (bits > 32)
127 goto emsgsize;
128 }
129
130 /* Firey death and destruction unless we prefetched EOS. */
131 if (ch != '\0')
132 goto enoent;
133
134 /* If nothing was written to the destination, we found no address. */
135 if (dst == odst)
136 goto enoent;
137 /* If no CIDR spec was given, infer width from net class. */
138 if (bits == -1) {
139 if (*odst >= 240) /* Class E */
140 bits = 32;
141 else if (*odst >= 224) /* Class D */
142 bits = 4;
143 else if (*odst >= 192) /* Class C */
144 bits = 24;
145 else if (*odst >= 128) /* Class B */
146 bits = 16;
147 else /* Class A */
148 bits = 8;
149 /* If imputed mask is narrower than specified octets, widen. */
150 if (bits >= 8 && bits < ((dst - odst) * 8))
151 bits = (dst - odst) * 8;
152 }
153 /* Extend network to cover the actual mask. */
154 while (bits > ((dst - odst) * 8)) {
155 if (size-- == 0)
156 goto emsgsize;
157 *dst++ = '\0';
158 }
159 return (bits);
160
161 enoent:
162 errno = ENOENT;
163 return (-1);
164
165 emsgsize:
166 errno = EMSGSIZE;
167 return (-1);
168 }
169
170 #ifdef INET6
171 static int
getbits(const char * src,int * bitsp)172 getbits(const char *src, int *bitsp) {
173 static const char digits[] = "0123456789";
174 int n;
175 int val;
176 char ch;
177
178 val = 0;
179 n = 0;
180 while ((ch = *src++) != '\0') {
181 const char *pch;
182
183 pch = strchr(digits, ch);
184 if (pch != NULL) {
185 if (n++ != 0 && val == 0) /* no leading zeros */
186 return (0);
187 val *= 10;
188 val += (pch - digits);
189 if (val > 128) /* range */
190 return (0);
191 continue;
192 }
193 return (0);
194 }
195 if (n == 0)
196 return (0);
197 *bitsp = val;
198 return (1);
199 }
200
201 static int
getv4(const char * src,unsigned char * dst,int * bitsp)202 getv4(const char *src, unsigned char *dst, int *bitsp) {
203 static const char digits[] = "0123456789";
204 unsigned char *odst = dst;
205 int n;
206 unsigned int val;
207 char ch;
208
209 val = 0;
210 n = 0;
211 while ((ch = *src++) != '\0') {
212 const char *pch;
213
214 pch = strchr(digits, ch);
215 if (pch != NULL) {
216 if (n++ != 0 && val == 0) /* no leading zeros */
217 return (0);
218 val *= 10;
219 val += (pch - digits);
220 if (val > 255) /* range */
221 return (0);
222 continue;
223 }
224 if (ch == '.' || ch == '/') {
225 if (dst - odst > 3) /* too many octets? */
226 return (0);
227 *dst++ = val;
228 if (ch == '/')
229 return (getbits(src, bitsp));
230 val = 0;
231 n = 0;
232 continue;
233 }
234 return (0);
235 }
236 if (n == 0)
237 return (0);
238 if (dst - odst > 3) /* too many octets? */
239 return (0);
240 *dst++ = val;
241 return (1);
242 }
243
244 static int
inet_net_pton_ipv6(const char * src,unsigned char * dst,size_t size)245 inet_net_pton_ipv6(const char *src, unsigned char *dst, size_t size) {
246 static const char xdigits_l[] = "0123456789abcdef",
247 xdigits_u[] = "0123456789ABCDEF";
248 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
249 const char *xdigits, *curtok;
250 int ch, saw_xdigit;
251 unsigned int val;
252 int digits;
253 int bits;
254 size_t bytes;
255 int words;
256 int ipv4;
257
258 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
259 endp = tp + NS_IN6ADDRSZ;
260 colonp = NULL;
261 /* Leading :: requires some special handling. */
262 if (*src == ':')
263 if (*++src != ':')
264 goto enoent;
265 curtok = src;
266 saw_xdigit = 0;
267 val = 0;
268 digits = 0;
269 bits = -1;
270 ipv4 = 0;
271 while ((ch = *src++) != '\0') {
272 const char *pch;
273
274 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
275 pch = strchr((xdigits = xdigits_u), ch);
276 if (pch != NULL) {
277 val <<= 4;
278 val |= (pch - xdigits);
279 if (++digits > 4)
280 goto enoent;
281 saw_xdigit = 1;
282 continue;
283 }
284 if (ch == ':') {
285 curtok = src;
286 if (!saw_xdigit) {
287 if (colonp)
288 goto enoent;
289 colonp = tp;
290 continue;
291 } else if (*src == '\0')
292 goto enoent;
293 if (tp + NS_INT16SZ > endp)
294 return (0);
295 *tp++ = (unsigned char) (val >> 8) & 0xff;
296 *tp++ = (unsigned char) val & 0xff;
297 saw_xdigit = 0;
298 digits = 0;
299 val = 0;
300 continue;
301 }
302 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
303 getv4(curtok, tp, &bits) > 0) {
304 tp += NS_INADDRSZ;
305 saw_xdigit = 0;
306 ipv4 = 1;
307 break; /* '\0' was seen by inet_pton4(). */
308 }
309 if (ch == '/' && getbits(src, &bits) > 0)
310 break;
311 goto enoent;
312 }
313 if (saw_xdigit) {
314 if (tp + NS_INT16SZ > endp)
315 goto enoent;
316 *tp++ = (unsigned char) (val >> 8) & 0xff;
317 *tp++ = (unsigned char) val & 0xff;
318 }
319 if (bits == -1)
320 bits = 128;
321
322 words = (bits + 15) / 16;
323 if (words < 2)
324 words = 2;
325 if (ipv4)
326 words = 8;
327 endp = tmp + 2 * words;
328
329 if (colonp != NULL) {
330 /*
331 * Since some memmove()'s erroneously fail to handle
332 * overlapping regions, we'll do the shift by hand.
333 */
334 const int n = tp - colonp;
335 int i;
336
337 if (tp == endp)
338 goto enoent;
339 for (i = 1; i <= n; i++) {
340 endp[- i] = colonp[n - i];
341 colonp[n - i] = 0;
342 }
343 tp = endp;
344 }
345 if (tp != endp)
346 goto enoent;
347
348 bytes = (bits + 7) / 8;
349 if (bytes > size)
350 goto emsgsize;
351 memcpy(dst, tmp, bytes);
352 return (bits);
353
354 enoent:
355 errno = ENOENT;
356 return (-1);
357
358 emsgsize:
359 errno = EMSGSIZE;
360 return (-1);
361 }
362 #endif /* INET6 */
363
364 /*
365 * int
366 * inet_net_pton(af, src, dst, size)
367 * convert network number from presentation to network format.
368 * accepts hex octets, hex strings, decimal octets, and /CIDR.
369 * "size" is in bytes and describes "dst".
370 * return:
371 * number of bits, either imputed classfully or specified with /CIDR,
372 * or -1 if some failure occurred (check errno). ENOENT means it was
373 * not a valid network specification.
374 * author:
375 * Paul Vixie (ISC), June 1996
376 */
377 int
inet_net_pton(int af,const char * src,void * dst,size_t size)378 inet_net_pton(int af, const char *src, void *dst, size_t size) {
379 switch (af) {
380 case AF_INET:
381 return (inet_net_pton_ipv4(src, dst, size));
382 #ifdef INET6
383 case AF_INET6:
384 return (inet_net_pton_ipv6(src, dst, size));
385 #endif /* INET6 */
386 default:
387 errno = EAFNOSUPPORT;
388 return (-1);
389 }
390 }
391