2 * Copyright (c) 1996-1999 by Internet Software Consortium.
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.
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
18 #define __FORCE_GLIBC__
20 #include <sys/param.h>
21 #include <sys/types.h>
22 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
26 #include <arpa/nameser.h>
33 * WARNING: Don't even consider trying to compile this on a system where
34 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
39 * inet_ntop4(src, dst, size)
40 * format an IPv4 address
45 * (2) takes a u_char* not an in_addr as input
50 inet_ntop4(src, dst, size)
55 char tmp[sizeof ("255.255.255.255") + 1] = "\0";
60 for (octet = 0; octet <= 3; octet++) {
62 if (src[octet] > 255) {
66 tmp[i++] = '0' + src[octet] / 100;
67 if (tmp[i - 1] == '0') {
68 tmp[i - 1] = '0' + (src[octet] / 10 % 10);
69 if (tmp[i - 1] == '0') i--;
71 tmp[i++] = '0' + (src[octet] / 10 % 10);
73 tmp[i++] = '0' + src[octet] % 10;
78 if (strlen (tmp) > size) {
83 return strcpy(dst, tmp);
88 * inet_ntop6(src, dst, size)
89 * convert IPv6 binary address into presentation (printable) format
97 inet_ntop6(src, dst, size)
103 * Note that int32_t and int16_t need only be "at least" large enough
104 * to contain a value of the specified size. On some systems, like
105 * Crays, there is no such thing as an integer variable with 16 bits.
106 * Keep this in mind if you think this function should have been coded
107 * to use pointer overlays. All the world's not a VAX.
109 char tmp[sizeof ("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")], *tp;
110 struct { int base, len; } best, cur;
116 * Copy the input (bytewise) array into a wordwise array.
117 * Find the longest run of 0x00's in src[] for :: shorthanding.
119 memset(words, '\0', sizeof words);
120 for (i = 0; i < 16; i += 2)
121 words[i / 2] = (src[i] << 8) | src[i + 1];
124 for (i = 0; i < 8; i++) {
127 cur.base = i, cur.len = 1;
131 if (cur.base != -1) {
132 if (best.base == -1 || cur.len > best.len)
138 if (cur.base != -1) {
139 if (best.base == -1 || cur.len > best.len)
142 if (best.base != -1 && best.len < 2)
149 for (i = 0; i < 8; i++) {
150 /* Are we inside the best run of 0x00's? */
151 if (best.base != -1 && i >= best.base &&
152 i < (best.base + best.len)) {
157 /* Are we following an initial run of 0x00s or any real hex? */
160 /* Is this address an encapsulated IPv4? */
161 if (i == 6 && best.base == 0 &&
162 (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
163 if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
168 tp += SPRINTF((tp, "%x", words[i]));
170 /* Was it a trailing run of 0x00's? */
171 if (best.base != -1 && (best.base + best.len) == 8)
176 * Check for overflow, copy, and we're done.
178 if ((size_t)(tp - tmp) > size) {
179 __set_errno (ENOSPC);
182 return strcpy(dst, tmp);
184 #endif /* INET_IPV6 */
188 * inet_pton4(src, dst)
189 * like inet_aton() but without all the hexadecimal and shorthand.
191 * 1 if `src' is a valid dotted quad, else 0.
193 * does not touch `dst' unless it's returning 1.
202 int saw_digit, octets, ch;
208 while ((ch = *src++) != '\0') {
210 if (ch >= '0' && ch <= '9') {
211 u_int new = *tp * 10 + (ch - '0');
221 } else if (ch == '.' && saw_digit) {
236 * inet_pton6(src, dst)
237 * convert presentation level address to network order binary form.
239 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
241 * (1) does not touch `dst' unless it's returning 1.
242 * (2) :: in a full address is silently ignored.
244 * inspired by Mark Andrews.
256 static const char xdigits[] = "0123456789abcdef";
257 u_char tmp[16], *tp, *endp, *colonp;
262 tp = memset(tmp, '\0', 16);
265 /* Leading :: requires some special handling. */
272 while ((ch = tolower (*src++)) != '\0') {
275 pch = strchr(xdigits, ch);
278 val |= (pch - xdigits);
291 } else if (*src == '\0') {
296 *tp++ = (u_char) (val >> 8) & 0xff;
297 *tp++ = (u_char) val & 0xff;
302 if (ch == '.' && ((tp + 4) <= endp) &&
303 inet_pton4(curtok, tp) > 0) {
306 break; /* '\0' was seen by inet_pton4(). */
313 *tp++ = (u_char) (val >> 8) & 0xff;
314 *tp++ = (u_char) val & 0xff;
316 if (colonp != NULL) {
318 * Since some memmove()'s erroneously fail to handle
319 * overlapping regions, we'll do the shift by hand.
321 const int n = tp - colonp;
326 for (i = 1; i <= n; i++) {
327 endp[- i] = colonp[n - i];
334 memcpy(dst, tmp, 16);
338 #endif /* INET_IPV6 */
343 * inet_ntop(af, src, dst, size)
344 * convert a network format address to presentation format.
346 * pointer to presentation format address (`dst'), or NULL (see errno).
351 inet_ntop(af, src, dst, size)
359 return (inet_ntop4(src, dst, size));
362 return (inet_ntop6(src, dst, size));
365 __set_errno (EAFNOSUPPORT);
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).
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)
384 inet_pton(af, src, dst)
391 return (inet_pton4(src, dst));
394 return (inet_pton6(src, dst));
397 __set_errno (EAFNOSUPPORT);