2 * Copyright (C) 1996-2001 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
9 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
10 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
11 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
13 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
14 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
15 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 * Original code by Paul Vixie. "curlified" by Gisle Vanem.
23 #ifndef HAVE_INET_NTOP
25 #ifdef HAVE_SYS_PARAM_H
26 #include <sys/param.h>
28 #ifdef HAVE_SYS_SOCKET_H
29 #include <sys/socket.h>
31 #ifdef HAVE_NETINET_IN_H
32 #include <netinet/in.h>
34 #ifdef HAVE_ARPA_INET_H
35 #include <arpa/inet.h>
40 #define _MPRINTF_REPLACE /* use our functions only */
41 #include <curl/mprintf.h>
43 #include "inet_ntop.h"
50 * Format an IPv4 address, more or less like inet_ntoa().
52 * Returns `dst' (as a const)
55 * - takes a unsigned char* not an in_addr as input
57 static char *inet_ntop4 (const unsigned char *src, char *dst, size_t size)
59 char tmp[sizeof "255.255.255.255"];
62 DEBUGASSERT(size >= 16);
65 (void)snprintf(tmp, sizeof(tmp), "%d.%d.%d.%d",
66 ((int)((unsigned char)src[0])) & 0xff,
67 ((int)((unsigned char)src[1])) & 0xff,
68 ((int)((unsigned char)src[2])) & 0xff,
69 ((int)((unsigned char)src[3])) & 0xff);
72 if(len == 0 || len >= size) {
82 * Convert IPv6 binary address into presentation (printable) format.
84 static char *inet_ntop6 (const unsigned char *src, char *dst, size_t size)
87 * Note that int32_t and int16_t need only be "at least" large enough
88 * to contain a value of the specified size. On some systems, like
89 * Crays, there is no such thing as an integer variable with 16 bits.
90 * Keep this in mind if you think this function should have been coded
91 * to use pointer overlays. All the world's not a VAX.
93 char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
99 unsigned long words[IN6ADDRSZ / INT16SZ];
103 * Copy the input (bytewise) array into a wordwise array.
104 * Find the longest run of 0x00's in src[] for :: shorthanding.
106 memset(words, '\0', sizeof(words));
107 for(i = 0; i < IN6ADDRSZ; i++)
108 words[i/2] |= (src[i] << ((1 - (i % 2)) << 3));
115 for(i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
118 cur.base = i, cur.len = 1;
122 else if(cur.base != -1) {
123 if(best.base == -1 || cur.len > best.len)
128 if((cur.base != -1) && (best.base == -1 || cur.len > best.len))
130 if(best.base != -1 && best.len < 2)
132 /* Format the result. */
134 for(i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
135 /* Are we inside the best run of 0x00's? */
136 if(best.base != -1 && i >= best.base && i < (best.base + best.len)) {
142 /* Are we following an initial run of 0x00s or any real hex?
147 /* Is this address an encapsulated IPv4?
149 if(i == 6 && best.base == 0 &&
150 (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
151 if(!inet_ntop4(src+12, tp, sizeof(tmp) - (tp - tmp))) {
158 tp += snprintf(tp, 5, "%lx", words[i]);
161 /* Was it a trailing run of 0x00's?
163 if(best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
167 /* Check for overflow, copy, and we're done.
169 if((size_t)(tp - tmp) > size) {
176 #endif /* ENABLE_IPV6 */
179 * Convert a network format address to presentation format.
181 * Returns pointer to presentation format address (`buf').
182 * Returns NULL on error and errno set with the specific
183 * error, EAFNOSUPPORT or ENOSPC.
185 * On Windows we store the error in the thread errno, not
186 * in the winsock error code. This is to avoid losing the
187 * actual last winsock error. So use macro ERRNO to fetch the
188 * errno this function sets when returning NULL, not SOCKERRNO.
190 char *Curl_inet_ntop(int af, const void *src, char *buf, size_t size)
194 return inet_ntop4((const unsigned char*)src, buf, size);
197 return inet_ntop6((const unsigned char*)src, buf, size);
200 SET_ERRNO(EAFNOSUPPORT);
204 #endif /* HAVE_INET_NTOP */