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
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 libc_hidden_proto(memcpy)
34 libc_hidden_proto(memset)
35 libc_hidden_proto(strchr)
36 libc_hidden_proto(strcpy)
37 libc_hidden_proto(strlen)
40 * WARNING: Don't even consider trying to compile this on a system where
41 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
46 * inet_ntop4(src, dst, size)
47 * format an IPv4 address
52 * (2) takes a u_char* not an in_addr as input
57 inet_ntop4(const u_char *src, char *dst, size_t size)
59 char tmp[sizeof ("255.255.255.255") + 1] = "\0";
64 for (octet = 0; octet <= 3; octet++) {
66 #if 0 /* since src is unsigned char, it will never be > 255 ... */
67 if (src[octet] > 255) {
72 tmp[i++] = '0' + src[octet] / 100;
73 if (tmp[i - 1] == '0') {
74 tmp[i - 1] = '0' + (src[octet] / 10 % 10);
75 if (tmp[i - 1] == '0') i--;
77 tmp[i++] = '0' + (src[octet] / 10 % 10);
79 tmp[i++] = '0' + src[octet] % 10;
84 if (strlen (tmp) > size) {
89 return strcpy(dst, tmp);
94 * inet_ntop6(src, dst, size)
95 * convert IPv6 binary address into presentation (printable) format
100 #ifdef __UCLIBC_HAS_IPV6__
103 inet_ntop6(const u_char *src, char *dst, size_t size)
106 * Note that int32_t and int16_t need only be "at least" large enough
107 * to contain a value of the specified size. On some systems, like
108 * Crays, there is no such thing as an integer variable with 16 bits.
109 * Keep this in mind if you think this function should have been coded
110 * to use pointer overlays. All the world's not a VAX.
112 char tmp[sizeof ("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")], *tp;
113 struct { int base, len; } best, cur;
119 * Copy the input (bytewise) array into a wordwise array.
120 * Find the longest run of 0x00's in src[] for :: shorthanding.
122 memset(words, '\0', sizeof words);
123 for (i = 0; i < 16; i += 2)
124 words[i / 2] = (src[i] << 8) | src[i + 1];
127 for (i = 0; i < 8; i++) {
130 cur.base = i, cur.len = 1;
134 if (cur.base != -1) {
135 if (best.base == -1 || cur.len > best.len)
141 if (cur.base != -1) {
142 if (best.base == -1 || cur.len > best.len)
145 if (best.base != -1 && best.len < 2)
152 for (i = 0; i < 8; i++) {
153 /* Are we inside the best run of 0x00's? */
154 if (best.base != -1 && i >= best.base &&
155 i < (best.base + best.len)) {
160 /* Are we following an initial run of 0x00s or any real hex? */
163 /* Is this address an encapsulated IPv4? */
164 if (i == 6 && best.base == 0 &&
165 (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
166 if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
171 tp += __sprintf(tp, "%x", words[i]);
173 /* Was it a trailing run of 0x00's? */
174 if (best.base != -1 && (best.base + best.len) == 8)
179 * Check for overflow, copy, and we're done.
181 if ((size_t)(tp - tmp) > size) {
182 __set_errno (ENOSPC);
185 return strcpy(dst, tmp);
187 #endif /* __UCLIBC_HAS_IPV6__ */
191 * inet_pton4(src, dst)
192 * like inet_aton() but without all the hexadecimal and shorthand.
194 * 1 if `src' is a valid dotted quad, else 0.
196 * does not touch `dst' unless it's returning 1.
201 inet_pton4(const char *src, u_char *dst)
203 int saw_digit, octets, ch;
209 while ((ch = *src++) != '\0') {
211 if (ch >= '0' && ch <= '9') {
212 u_int new = *tp * 10 + (ch - '0');
222 } else if (ch == '.' && saw_digit) {
237 * inet_pton6(src, dst)
238 * convert presentation level address to network order binary form.
240 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
242 * (1) does not touch `dst' unless it's returning 1.
243 * (2) :: in a full address is silently ignored.
245 * inspired by Mark Andrews.
250 #ifdef __UCLIBC_HAS_IPV6__
252 /* We cannot use the macro version of tolower() or very bad
253 * things happen when '*src++' gets evaluated multiple times.
254 * So undef it here so we get the function version of tolower
260 inet_pton6(const char *src, u_char *dst)
262 static const char xdigits[] = "0123456789abcdef";
263 u_char tmp[16], *tp, *endp, *colonp;
269 tp = memset(tmp, '\0', 16);
272 /* Leading :: requires some special handling. */
279 while ((ch = __tolower (*src++)) != '\0') {
282 pch = strchr(xdigits, ch);
285 val |= (pch - xdigits);
298 } else if (*src == '\0') {
303 *tp++ = (u_char) (val >> 8) & 0xff;
304 *tp++ = (u_char) val & 0xff;
309 if (ch == '.' && ((tp + 4) <= endp) &&
310 inet_pton4(curtok, tp) > 0) {
313 break; /* '\0' was seen by inet_pton4(). */
320 *tp++ = (u_char) (val >> 8) & 0xff;
321 *tp++ = (u_char) val & 0xff;
323 if (colonp != NULL) {
325 * Since some memmove()'s erroneously fail to handle
326 * overlapping regions, we'll do the shift by hand.
328 const int n = tp - colonp;
333 for (i = 1; i <= n; i++) {
334 endp[- i] = colonp[n - i];
341 memcpy(dst, tmp, 16);
345 #endif /* __UCLIBC_HAS_IPV6__ */
350 * inet_ntop(af, src, dst, size)
351 * convert a network format address to presentation format.
353 * pointer to presentation format address (`dst'), or NULL (see errno).
358 inet_ntop(int af, const void *src, char *dst, socklen_t size)
362 return (inet_ntop4(src, dst, size));
363 #ifdef __UCLIBC_HAS_IPV6__
365 return (inet_ntop6(src, dst, size));
368 __set_errno (EAFNOSUPPORT);
373 libc_hidden_proto(inet_ntop)
374 libc_hidden_def(inet_ntop)
378 * inet_pton(af, src, dst)
379 * convert from presentation format (which usually means ASCII printable)
380 * to network format (which is usually some kind of binary format).
382 * 1 if the address was valid for the specified address family
383 * 0 if the address wasn't valid (`dst' is untouched in this case)
384 * -1 if some other error occurred (`dst' is untouched in this case, too)
389 inet_pton(int af, const char *src, void *dst)
393 return (inet_pton4(src, dst));
394 #ifdef __UCLIBC_HAS_IPV6__
396 return (inet_pton6(src, dst));
399 __set_errno (EAFNOSUPPORT);
404 libc_hidden_proto(inet_pton)
405 libc_hidden_def(inet_pton)