2005-05-26 16:56:25 -04:00
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/*
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* Copyright (C) 1996-2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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2004-04-26 03:20:11 -04:00
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/*
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* Original code by Paul Vixie. "curlified" by Gisle Vanem.
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*/
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#include "setup.h"
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#ifndef HAVE_INET_NTOP
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#include <string.h>
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#include <errno.h>
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2004-06-24 07:54:11 -04:00
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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2004-04-26 03:20:11 -04:00
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#include "inet_ntop.h"
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2004-04-27 10:17:36 -04:00
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#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
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/* this platform has a inet_ntoa_r() function, but no proto declared anywhere
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so we include our own proto to make compilers happy */
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#include "inet_ntoa_r.h"
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#endif
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2004-10-06 03:50:18 -04:00
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#define IN6ADDRSZ 16
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#define INADDRSZ 4
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#define INT16SZ 2
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2004-04-26 03:20:11 -04:00
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#ifdef WIN32
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#define EAFNOSUPPORT WSAEAFNOSUPPORT
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#define SET_ERRNO(e) WSASetLastError(errno = (e))
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#else
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#define SET_ERRNO(e) errno = e
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#endif
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/*
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* Format an IPv4 address, more or less like inet_ntoa().
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*
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* Returns `dst' (as a const)
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* Note:
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* - uses no statics
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2005-12-08 17:59:58 -05:00
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* - takes a unsigned char* not an in_addr as input
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2004-04-26 03:20:11 -04:00
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*/
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2005-12-08 17:59:58 -05:00
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static char *inet_ntop4 (const unsigned char *src, char *dst, size_t size)
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2004-04-26 03:20:11 -04:00
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{
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2005-03-15 16:00:46 -05:00
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#if defined(HAVE_INET_NTOA_R_2_ARGS)
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const char *ptr;
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curlassert(size >= 16);
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ptr = inet_ntoa_r(*(struct in_addr*)src, dst);
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2005-03-15 21:25:12 -05:00
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return (char *)memmove(dst, ptr, strlen(ptr)+1);
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2005-03-15 16:00:46 -05:00
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#elif defined(HAVE_INET_NTOA_R)
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2004-04-26 03:20:11 -04:00
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return inet_ntoa_r(*(struct in_addr*)src, dst, size);
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2005-03-15 16:00:46 -05:00
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2004-04-26 03:20:11 -04:00
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#else
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const char *addr = inet_ntoa(*(struct in_addr*)src);
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if (strlen(addr) >= size)
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{
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SET_ERRNO(ENOSPC);
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return (NULL);
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}
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return strcpy(dst, addr);
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#endif
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}
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#ifdef ENABLE_IPV6
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/*
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* Convert IPv6 binary address into presentation (printable) format.
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*/
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2005-12-08 17:59:58 -05:00
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static char *inet_ntop6 (const unsigned char *src, char *dst, size_t size)
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2004-04-26 03:20:11 -04:00
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{
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/*
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* Note that int32_t and int16_t need only be "at least" large enough
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* to contain a value of the specified size. On some systems, like
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* Crays, there is no such thing as an integer variable with 16 bits.
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* Keep this in mind if you think this function should have been coded
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* to use pointer overlays. All the world's not a VAX.
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*/
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char tmp [sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
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char *tp;
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struct {
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long base;
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long len;
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} best, cur;
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u_long words [IN6ADDRSZ / INT16SZ];
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int i;
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/* Preprocess:
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* Copy the input (bytewise) array into a wordwise array.
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* Find the longest run of 0x00's in src[] for :: shorthanding.
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*/
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memset(words, 0, sizeof(words));
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for (i = 0; i < IN6ADDRSZ; i++)
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words[i/2] |= (src[i] << ((1 - (i % 2)) << 3));
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best.base = -1;
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cur.base = -1;
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for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++)
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{
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if (words[i] == 0)
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{
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if (cur.base == -1)
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cur.base = i, cur.len = 1;
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else
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cur.len++;
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}
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else if (cur.base != -1)
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{
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if (best.base == -1 || cur.len > best.len)
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best = cur;
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cur.base = -1;
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}
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}
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if ((cur.base != -1) && (best.base == -1 || cur.len > best.len))
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best = cur;
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if (best.base != -1 && best.len < 2)
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best.base = -1;
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/* Format the result.
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*/
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tp = tmp;
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for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++)
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{
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/* Are we inside the best run of 0x00's?
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*/
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if (best.base != -1 && i >= best.base && i < (best.base + best.len))
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{
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if (i == best.base)
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*tp++ = ':';
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continue;
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}
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/* Are we following an initial run of 0x00s or any real hex?
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*/
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if (i != 0)
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*tp++ = ':';
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/* Is this address an encapsulated IPv4?
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*/
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if (i == 6 && best.base == 0 &&
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(best.len == 6 || (best.len == 5 && words[5] == 0xffff)))
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{
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if (!inet_ntop4(src+12, tp, sizeof(tmp) - (tp - tmp)))
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{
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SET_ERRNO(ENOSPC);
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return (NULL);
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}
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tp += strlen(tp);
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break;
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}
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2004-06-24 11:15:27 -04:00
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tp += snprintf(tp, 5, "%lx", words[i]);
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2004-04-26 03:20:11 -04:00
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}
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/* Was it a trailing run of 0x00's?
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*/
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if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
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*tp++ = ':';
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*tp++ = '\0';
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/* Check for overflow, copy, and we're done.
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*/
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if ((size_t)(tp - tmp) > size)
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{
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SET_ERRNO(ENOSPC);
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return (NULL);
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}
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return strcpy (dst, tmp);
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}
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#endif /* ENABLE_IPV6 */
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/*
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* Convert a network format address to presentation format.
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*
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2005-03-15 21:25:12 -05:00
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* Returns pointer to presentation format address (`buf'),
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2004-04-26 03:20:11 -04:00
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* Returns NULL on error (see errno).
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*/
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2005-03-15 21:25:12 -05:00
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char *Curl_inet_ntop(int af, const void *src, char *buf, size_t size)
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2004-04-26 03:20:11 -04:00
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{
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switch (af) {
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case AF_INET:
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2005-12-08 17:59:58 -05:00
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return inet_ntop4((const unsigned char*)src, buf, size);
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2004-04-26 03:20:11 -04:00
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#ifdef ENABLE_IPV6
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case AF_INET6:
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2005-12-08 17:59:58 -05:00
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return inet_ntop6((const unsigned char*)src, buf, size);
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2004-04-26 03:20:11 -04:00
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#endif
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default:
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SET_ERRNO(EAFNOSUPPORT);
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return NULL;
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}
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}
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#endif /* HAVE_INET_NTOP */
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