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_TYPES_H
29 #include <sys/types.h>
31 #ifdef HAVE_SYS_SOCKET_H
32 #include <sys/socket.h>
34 #ifdef HAVE_NETINET_IN_H
35 #include <netinet/in.h>
37 #ifdef HAVE_ARPA_INET_H
38 #include <arpa/inet.h>
43 #define _MPRINTF_REPLACE /* use our functions only */
44 #include <curl/mprintf.h>
46 #include "inet_ntop.h"
48 #if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
49 /* this platform has a inet_ntoa_r() function, but no proto declared anywhere
50 so we include our own proto to make compilers happy */
51 #include "inet_ntoa_r.h"
59 * Format an IPv4 address, more or less like inet_ntoa().
61 * Returns `dst' (as a const)
64 * - takes a unsigned char* not an in_addr as input
66 static char *inet_ntop4 (const unsigned char *src, char *dst, size_t size)
68 #if defined(HAVE_INET_NTOA_R_2_ARGS)
70 curlassert(size >= 16);
71 ptr = inet_ntoa_r(*(struct in_addr*)src, dst);
72 return (char *)memmove(dst, ptr, strlen(ptr)+1);
74 #elif defined(HAVE_INET_NTOA_R)
75 return inet_ntoa_r(*(struct in_addr*)src, dst, size);
78 const char *addr = inet_ntoa(*(struct in_addr*)src);
80 if (strlen(addr) >= size)
85 return strcpy(dst, addr);
91 * Convert IPv6 binary address into presentation (printable) format.
93 static char *inet_ntop6 (const unsigned char *src, char *dst, size_t size)
96 * Note that int32_t and int16_t need only be "at least" large enough
97 * to contain a value of the specified size. On some systems, like
98 * Crays, there is no such thing as an integer variable with 16 bits.
99 * Keep this in mind if you think this function should have been coded
100 * to use pointer overlays. All the world's not a VAX.
102 char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
108 unsigned long words[IN6ADDRSZ / INT16SZ];
112 * Copy the input (bytewise) array into a wordwise array.
113 * Find the longest run of 0x00's in src[] for :: shorthanding.
115 memset(words, '\0', sizeof(words));
116 for (i = 0; i < IN6ADDRSZ; i++)
117 words[i/2] |= (src[i] << ((1 - (i % 2)) << 3));
124 for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++)
129 cur.base = i, cur.len = 1;
133 else if (cur.base != -1)
135 if (best.base == -1 || cur.len > best.len)
140 if ((cur.base != -1) && (best.base == -1 || cur.len > best.len))
142 if (best.base != -1 && best.len < 2)
145 /* Format the result.
148 for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++)
150 /* Are we inside the best run of 0x00's?
152 if (best.base != -1 && i >= best.base && i < (best.base + best.len))
159 /* Are we following an initial run of 0x00s or any real hex?
164 /* Is this address an encapsulated IPv4?
166 if (i == 6 && best.base == 0 &&
167 (best.len == 6 || (best.len == 5 && words[5] == 0xffff)))
169 if (!inet_ntop4(src+12, tp, sizeof(tmp) - (tp - tmp)))
177 tp += snprintf(tp, 5, "%lx", words[i]);
180 /* Was it a trailing run of 0x00's?
182 if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
186 /* Check for overflow, copy, and we're done.
188 if ((size_t)(tp - tmp) > size)
193 return strcpy (dst, tmp);
195 #endif /* ENABLE_IPV6 */
198 * Convert a network format address to presentation format.
200 * Returns pointer to presentation format address (`buf').
201 * Returns NULL on error and errno set with the specific
202 * error, EAFNOSUPPORT or ENOSPC.
204 * On Windows we store the error in the thread errno, not
205 * in the winsock error code. This is to avoid loosing the
206 * actual last winsock error. So use macro ERRNO to fetch the
207 * errno this funtion sets when returning NULL, not SOCKERRNO.
209 char *Curl_inet_ntop(int af, const void *src, char *buf, size_t size)
213 return inet_ntop4((const unsigned char*)src, buf, size);
216 return inet_ntop6((const unsigned char*)src, buf, size);
219 SET_ERRNO(EAFNOSUPPORT);
223 #endif /* HAVE_INET_NTOP */