CMakeLua/Utilities/cmcurl-7.19.0/lib/inet_ntop.c

   1 /*
   2  * Copyright (C) 1996-2001  Internet Software Consortium.
   3  *
   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.
   7  *
   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.
  16  */
  17 /*
  18  * Original code by Paul Vixie. "curlified" by Gisle Vanem.
  19  */
  20
  21 #include "setup.h"
  22
  23 #ifndef HAVE_INET_NTOP
  24
  25 #ifdef HAVE_SYS_PARAM_H
  26 #include <sys/param.h>
  27 #endif
  28 #ifdef HAVE_SYS_SOCKET_H
  29 #include <sys/socket.h>
  30 #endif
  31 #ifdef HAVE_NETINET_IN_H
  32 #include <netinet/in.h>
  33 #endif
  34 #ifdef HAVE_ARPA_INET_H
  35 #include <arpa/inet.h>
  36 #endif
  37 #include <string.h>
  38 #include <errno.h>
  39
  40 #define _MPRINTF_REPLACE /* use our functions only */
  41 #include <curl/mprintf.h>
  42
  43 #include "inet_ntop.h"
  44
  45 #if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
  46 /* this platform has a inet_ntoa_r() function, but no proto declared anywhere
  47    so we include our own proto to make compilers happy */
  48 #include "inet_ntoa_r.h"
  49 #endif
  50
  51 #define IN6ADDRSZ       16
  52 #define INADDRSZ         4
  53 #define INT16SZ          2
  54
  55 /*
  56  * Format an IPv4 address, more or less like inet_ntoa().
  57  *
  58  * Returns `dst' (as a const)
  59  * Note:
  60  *  - uses no statics
  61  *  - takes a unsigned char* not an in_addr as input
  62  */
  63 static char *inet_ntop4 (const unsigned char *src, char *dst, size_t size)
  64 {
  65 #if defined(HAVE_INET_NTOA_R_2_ARGS)
  66   const char *ptr;
  67   DEBUGASSERT(size >= 16);
  68   ptr = inet_ntoa_r(*(struct in_addr*)src, dst);
  69   return (char *)memmove(dst, ptr, strlen(ptr)+1);
  70
  71 #elif defined(HAVE_INET_NTOA_R)
  72
  73 #if defined(HAVE_INT_INET_NTOA_R)
  74   return inet_ntoa_r(*(struct in_addr*)src, dst, size)? NULL: dst;
  75 #else
  76   return inet_ntoa_r(*(struct in_addr*)src, dst, size);
  77 #endif
  78
  79 #else
  80   const char *addr = inet_ntoa(*(struct in_addr*)src);
  81
  82   if(strlen(addr) >= size)
  83   {
  84     SET_ERRNO(ENOSPC);
  85     return (NULL);
  86   }
  87   return strcpy(dst, addr);
  88 #endif
  89 }
  90
  91 #ifdef ENABLE_IPV6
  92 /*
  93  * Convert IPv6 binary address into presentation (printable) format.
  94  */
  95 static char *inet_ntop6 (const unsigned char *src, char *dst, size_t size)
  96 {
  97   /*
  98    * Note that int32_t and int16_t need only be "at least" large enough
  99    * to contain a value of the specified size.  On some systems, like
 100    * Crays, there is no such thing as an integer variable with 16 bits.
 101    * Keep this in mind if you think this function should have been coded
 102    * to use pointer overlays.  All the world's not a VAX.
 103    */
 104   char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
 105   char *tp;
 106   struct {
 107     long base;
 108     long len;
 109   } best, cur;
 110   unsigned long words[IN6ADDRSZ / INT16SZ];
 111   int i;
 112
 113   /* Preprocess:
 114    *  Copy the input (bytewise) array into a wordwise array.
 115    *  Find the longest run of 0x00's in src[] for :: shorthanding.
 116    */
 117   memset(words, '\0', sizeof(words));
 118   for (i = 0; i < IN6ADDRSZ; i++)
 119       words[i/2] |= (src[i] << ((1 - (i % 2)) << 3));
 120
 121   best.base = -1;
 122   cur.base  = -1;
 123   best.len = 0;
 124   cur.len = 0;
 125
 126   for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++)
 127   {
 128     if(words[i] == 0)
 129     {
 130       if(cur.base == -1)
 131         cur.base = i, cur.len = 1;
 132       else
 133         cur.len++;
 134     }
 135     else if(cur.base != -1)
 136     {
 137       if(best.base == -1 || cur.len > best.len)
 138          best = cur;
 139       cur.base = -1;
 140     }
 141   }
 142   if((cur.base != -1) && (best.base == -1 || cur.len > best.len))
 143      best = cur;
 144   if(best.base != -1 && best.len < 2)
 145      best.base = -1;
 146
 147   /* Format the result.
 148    */
 149   tp = tmp;
 150   for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++)
 151   {
 152     /* Are we inside the best run of 0x00's?
 153      */
 154     if(best.base != -1 && i >= best.base && i < (best.base + best.len))
 155     {
 156       if(i == best.base)
 157          *tp++ = ':';
 158       continue;
 159     }
 160
 161     /* Are we following an initial run of 0x00s or any real hex?
 162      */
 163     if(i != 0)
 164        *tp++ = ':';
 165
 166     /* Is this address an encapsulated IPv4?
 167      */
 168     if(i == 6 && best.base == 0 &&
 169         (best.len == 6 || (best.len == 5 && words[5] == 0xffff)))
 170     {
 171       if(!inet_ntop4(src+12, tp, sizeof(tmp) - (tp - tmp)))
 172       {
 173         SET_ERRNO(ENOSPC);
 174         return (NULL);
 175       }
 176       tp += strlen(tp);
 177       break;
 178     }
 179     tp += snprintf(tp, 5, "%lx", words[i]);
 180   }
 181
 182   /* Was it a trailing run of 0x00's?
 183    */
 184   if(best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
 185      *tp++ = ':';
 186   *tp++ = '\0';
 187
 188   /* Check for overflow, copy, and we're done.
 189    */
 190   if((size_t)(tp - tmp) > size)
 191   {
 192     SET_ERRNO(ENOSPC);
 193     return (NULL);
 194   }
 195   return strcpy (dst, tmp);
 196 }
 197 #endif  /* ENABLE_IPV6 */
 198
 199 /*
 200  * Convert a network format address to presentation format.
 201  *
 202  * Returns pointer to presentation format address (`buf').
 203  * Returns NULL on error and errno set with the specific
 204  * error, EAFNOSUPPORT or ENOSPC.
 205  *
 206  * On Windows we store the error in the thread errno, not
 207  * in the winsock error code. This is to avoid loosing the
 208  * actual last winsock error. So use macro ERRNO to fetch the
 209  * errno this funtion sets when returning NULL, not SOCKERRNO.
 210  */
 211 char *Curl_inet_ntop(int af, const void *src, char *buf, size_t size)
 212 {
 213   switch (af) {
 214   case AF_INET:
 215     return inet_ntop4((const unsigned char*)src, buf, size);
 216 #ifdef ENABLE_IPV6
 217   case AF_INET6:
 218     return inet_ntop6((const unsigned char*)src, buf, size);
 219 #endif
 220   default:
 221     SET_ERRNO(EAFNOSUPPORT);
 222     return NULL;
 223   }
 224 }
 225 #endif  /* HAVE_INET_NTOP */