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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [inet/] [ntop.c] - Blame information for rev 1771

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Line No. Rev Author Line
1 1325 phoenix 
/*
2 
 * Copyright (c) 1996-1999 by Internet Software Consortium.
3 
 *
4 
 * Permission to use, copy, modify, and distribute this software for any
5 
 * purpose with or without fee is hereby granted, provided that the above
6 
 * copyright notice and this permission notice appear in all copies.
7 
 *
8 
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
15 
 * SOFTWARE.
16 
 */
17 
 
18 
#define __FORCE_GLIBC
19 
#include <features.h>
20 
#include <sys/param.h>
21 
#include <sys/types.h>
22 
#include <sys/socket.h>
23 
 
24 
#include <netinet/in.h>
25 
#include <arpa/inet.h>
26 
#include <arpa/nameser.h>
27 
 
28 
#include <errno.h>
29 
#include <stdio.h>
30 
#include <string.h>
31 
#include <ctype.h>
32 
 
33 
 
34 
/*
35 
 * WARNING: Don't even consider trying to compile this on a system where
36 
 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
37 
 */
38 
 
39 
 
40 
/* const char *
41 
 * inet_ntop4(src, dst, size)
42 
 *      format an IPv4 address
43 
 * return:
44 
 *      `dst' (as a const)
45 
 * notes:
46 
 *      (1) uses no statics
47 
 *      (2) takes a u_char* not an in_addr as input
48 
 * author:
49 
 *      Paul Vixie, 1996.
50 
 */
51 
static const char *
52 
inet_ntop4(const u_char *src, char *dst, size_t size)
53 
{
54 
        char tmp[sizeof ("255.255.255.255") + 1] = "\0";
55 
        int octet;
56 
        int i;
57 
 
58 
        i = 0;
59 
        for (octet = 0; octet <= 3; octet++) {
60 
 
61 
                if (src[octet] > 255) {
62 
                        __set_errno (ENOSPC);
63 
                        return (NULL);
64 
                }
65 
                tmp[i++] = '0' + src[octet] / 100;
66 
                if (tmp[i - 1] == '0') {
67 
                        tmp[i - 1] = '0' + (src[octet] / 10 % 10);
68 
                        if (tmp[i - 1] == '0') i--;
69 
                } else {
70 
                        tmp[i++] = '0' + (src[octet] / 10 % 10);
71 
                }
72 
                tmp[i++] = '0' + src[octet] % 10;
73 
                tmp[i++] = '.';
74 
        }
75 
        tmp[i - 1] = '\0';
76 
 
77 
        if (strlen (tmp) > size) {
78 
                __set_errno (ENOSPC);
79 
                return (NULL);
80 
        }
81 
 
82 
        return strcpy(dst, tmp);
83 
}
84 
 
85 
 
86 
/* const char *
87 
 * inet_ntop6(src, dst, size)
88 
 *      convert IPv6 binary address into presentation (printable) format
89 
 * author:
90 
 *      Paul Vixie, 1996.
91 
 */
92 
 
93 
#ifdef __UCLIBC_HAS_IPV6__
94 
 
95 
static const char *
96 
inet_ntop6(const u_char *src, char *dst, size_t size)
97 
{
98 
        /*
99 
         * Note that int32_t and int16_t need only be "at least" large enough
100 
         * to contain a value of the specified size.  On some systems, like
101 
         * Crays, there is no such thing as an integer variable with 16 bits.
102 
         * Keep this in mind if you think this function should have been coded
103 
         * to use pointer overlays.  All the world's not a VAX.
104 
         */
105 
        char tmp[sizeof ("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")], *tp;
106 
        struct { int base, len; } best, cur;
107 
        u_int words[8];
108 
        int i;
109 
 
110 
        /*
111 
         * Preprocess:
112 
         *      Copy the input (bytewise) array into a wordwise array.
113 
         *      Find the longest run of 0x00's in src[] for :: shorthanding.
114 
         */
115 
        memset(words, '\0', sizeof words);
116 
        for (i = 0; i < 16; i += 2)
117 
                words[i / 2] = (src[i] << 8) | src[i + 1];
118 
        best.base = -1;
119 
        cur.base = -1;
120 
        for (i = 0; i < 8; i++) {
121 
                if (words[i] == 0) {
122 
                        if (cur.base == -1)
123 
                                cur.base = i, cur.len = 1;
124 
                        else
125 
                                cur.len++;
126 
                } else {
127 
                        if (cur.base != -1) {
128 
                                if (best.base == -1 || cur.len > best.len)
129 
                                        best = cur;
130 
                                cur.base = -1;
131 
                        }
132 
                }
133 
        }
134 
        if (cur.base != -1) {
135 
                if (best.base == -1 || cur.len > best.len)
136 
                        best = cur;
137 
        }
138 
        if (best.base != -1 && best.len < 2)
139 
                best.base = -1;
140 
 
141 
        /*
142 
         * Format the result.
143 
         */
144 
        tp = tmp;
145 
        for (i = 0; i < 8; i++) {
146 
                /* Are we inside the best run of 0x00's? */
147 
                if (best.base != -1 && i >= best.base &&
148 
                    i < (best.base + best.len)) {
149 
                        if (i == best.base)
150 
                                *tp++ = ':';
151 
                        continue;
152 
                }
153 
                /* Are we following an initial run of 0x00s or any real hex? */
154 
                if (i != 0)
155 
                        *tp++ = ':';
156 
                /* Is this address an encapsulated IPv4? */
157 
                if (i == 6 && best.base == 0 &&
158 
                    (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
159 
                        if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
160 
                                return (NULL);
161 
                        tp += strlen(tp);
162 
                        break;
163 
                }
164 
                tp += sprintf(tp, "%x", words[i]);
165 
        }
166 
        /* Was it a trailing run of 0x00's? */
167 
        if (best.base != -1 && (best.base + best.len) == 8)
168 
                *tp++ = ':';
169 
        *tp++ = '\0';
170 
 
171 
        /*
172 
         * Check for overflow, copy, and we're done.
173 
         */
174 
        if ((size_t)(tp - tmp) > size) {
175 
                __set_errno (ENOSPC);
176 
                return (NULL);
177 
        }
178 
        return strcpy(dst, tmp);
179 
}
180 
#endif /* __UCLIBC_HAS_IPV6__ */
181 
 
182 
 
183 
/* int
184 
 * inet_pton4(src, dst)
185 
 *      like inet_aton() but without all the hexadecimal and shorthand.
186 
 * return:
187 
 *      1 if `src' is a valid dotted quad, else 0.
188 
 * notice:
189 
 *      does not touch `dst' unless it's returning 1.
190 
 * author:
191 
 *      Paul Vixie, 1996.
192 
 */
193 
static int
194 
inet_pton4(const char *src, u_char *dst)
195 
{
196 
        int saw_digit, octets, ch;
197 
        u_char tmp[4], *tp;
198 
 
199 
        saw_digit = 0;
200 
        octets = 0;
201 
        *(tp = tmp) = 0;
202 
        while ((ch = *src++) != '\0') {
203 
 
204 
                if (ch >= '0' && ch <= '9') {
205 
                        u_int new = *tp * 10 + (ch - '0');
206 
 
207 
                        if (new > 255)
208 
                                return (0);
209 
                        *tp = new;
210 
                        if (! saw_digit) {
211 
                                if (++octets > 4)
212 
                                        return (0);
213 
                                saw_digit = 1;
214 
                        }
215 
                } else if (ch == '.' && saw_digit) {
216 
                        if (octets == 4)
217 
                                return (0);
218 
                        *++tp = 0;
219 
                        saw_digit = 0;
220 
                } else
221 
                        return (0);
222 
        }
223 
        if (octets < 4)
224 
                return (0);
225 
        memcpy(dst, tmp, 4);
226 
        return (1);
227 
}
228 
 
229 
/* int
230 
 * inet_pton6(src, dst)
231 
 *      convert presentation level address to network order binary form.
232 
 * return:
233 
 *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
234 
 * notice:
235 
 *      (1) does not touch `dst' unless it's returning 1.
236 
 *      (2) :: in a full address is silently ignored.
237 
 * credit:
238 
 *      inspired by Mark Andrews.
239 
 * author:
240 
 *      Paul Vixie, 1996.
241 
 */
242 
 
243 
#ifdef __UCLIBC_HAS_IPV6__
244 
 
245 
/* We cannot use the macro version of tolower() or very bad
246 
 * things happen when '*src++' gets evaluated multiple times.
247 
 * So * undef it here so we get the function version of tolower
248 
 * instead.
249 
 */
250 
#undef tolower
251 
 
252 
static int
253 
inet_pton6(const char *src, u_char *dst)
254 
{
255 
        static const char xdigits[] = "0123456789abcdef";
256 
        u_char tmp[16], *tp, *endp, *colonp;
257 
        const char *curtok;
258 
        int ch, saw_xdigit;
259 
        u_int val;
260 
 
261 
 
262 
        tp = memset(tmp, '\0', 16);
263 
        endp = tp + 16;
264 
        colonp = NULL;
265 
        /* Leading :: requires some special handling. */
266 
        if (*src == ':')
267 
                if (*++src != ':')
268 
                        return (0);
269 
        curtok = src;
270 
        saw_xdigit = 0;
271 
        val = 0;
272 
        while ((ch = tolower (*src++)) != '\0') {
273 
                const char *pch;
274 
 
275 
                pch = strchr(xdigits, ch);
276 
                if (pch != NULL) {
277 
                        val <<= 4;
278 
                        val |= (pch - xdigits);
279 
                        if (val > 0xffff)
280 
                                return (0);
281 
                        saw_xdigit = 1;
282 
                        continue;
283 
                }
284 
                if (ch == ':') {
285 
                        curtok = src;
286 
                        if (!saw_xdigit) {
287 
                                if (colonp)
288 
                                        return (0);
289 
                                colonp = tp;
290 
                                continue;
291 
                        } else if (*src == '\0') {
292 
                                return (0);
293 
                        }
294 
                        if (tp + 2 > endp)
295 
                                return (0);
296 
                        *tp++ = (u_char) (val >> 8) & 0xff;
297 
                        *tp++ = (u_char) val & 0xff;
298 
                        saw_xdigit = 0;
299 
                        val = 0;
300 
                        continue;
301 
                }
302 
                if (ch == '.' && ((tp + 4) <= endp) &&
303 
                    inet_pton4(curtok, tp) > 0) {
304 
                        tp += 4;
305 
                        saw_xdigit = 0;
306 
                        break;  /* '\0' was seen by inet_pton4(). */
307 
                }
308 
                return (0);
309 
        }
310 
        if (saw_xdigit) {
311 
                if (tp + 2 > endp)
312 
                        return (0);
313 
                *tp++ = (u_char) (val >> 8) & 0xff;
314 
                *tp++ = (u_char) val & 0xff;
315 
        }
316 
        if (colonp != NULL) {
317 
                /*
318 
                 * Since some memmove()'s erroneously fail to handle
319 
                 * overlapping regions, we'll do the shift by hand.
320 
                 */
321 
                const int n = tp - colonp;
322 
                int i;
323 
 
324 
                if (tp == endp)
325 
                        return (0);
326 
                for (i = 1; i <= n; i++) {
327 
                        endp[- i] = colonp[n - i];
328 
                        colonp[n - i] = 0;
329 
                }
330 
                tp = endp;
331 
        }
332 
        if (tp != endp)
333 
                return (0);
334 
        memcpy(dst, tmp, 16);
335 
        return (1);
336 
}
337 
 
338 
#endif /* __UCLIBC_HAS_IPV6__ */
339 
 
340 
 
341 
 
342 
/* char *
343 
 * inet_ntop(af, src, dst, size)
344 
 *      convert a network format address to presentation format.
345 
 * return:
346 
 *      pointer to presentation format address (`dst'), or NULL (see errno).
347 
 * author:
348 
 *      Paul Vixie, 1996.
349 
 */
350 
extern const char *
351 
inet_ntop(af, src, dst, size)
352 
        int af;
353 
        const void *src;
354 
        char *dst;
355 
        socklen_t size;
356 
{
357 
        switch (af) {
358 
        case AF_INET:
359 
                return (inet_ntop4(src, dst, size));
360 
#ifdef __UCLIBC_HAS_IPV6__
361 
        case AF_INET6:
362 
                return (inet_ntop6(src, dst, size));
363 
#endif
364 
        default:
365 
                __set_errno (EAFNOSUPPORT);
366 
                return (NULL);
367 
        }
368 
        /* NOTREACHED */
369 
}
370 
 
371 
 
372 
/* int
373 
 * inet_pton(af, src, dst)
374 
 *      convert from presentation format (which usually means ASCII printable)
375 
 *      to network format (which is usually some kind of binary format).
376 
 * return:
377 
 *      1 if the address was valid for the specified address family
378 
 *      0 if the address wasn't valid (`dst' is untouched in this case)
379 
 *      -1 if some other error occurred (`dst' is untouched in this case, too)
380 
 * author:
381 
 *      Paul Vixie, 1996.
382 
 */
383 
extern int
384 
inet_pton(af, src, dst)
385 
        int af;
386 
        const char *src;
387 
        void *dst;
388 
{
389 
        switch (af) {
390 
        case AF_INET:
391 
                return (inet_pton4(src, dst));
392 
#ifdef __UCLIBC_HAS_IPV6__
393 
        case AF_INET6:
394 
                return (inet_pton6(src, dst));
395 
#endif
396 
        default:
397 
                __set_errno (EAFNOSUPPORT);
398 
                return (-1);
399 
        }
400 
        /* NOTREACHED */
401 
}
402 
 

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