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

   1 /* This is from the BIND 4.9.4 release, modified to compile by itself */
   2
   3 /* Copyright (c) 1996 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
  10  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  11  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  12  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  13  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  14  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  15  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  16  * SOFTWARE.
  17  */
  18
  19 #include "setup.h"
  20
  21 #ifndef HAVE_INET_PTON
  22
  23 #ifdef HAVE_SYS_PARAM_H
  24 #include <sys/param.h>
  25 #endif
  26 #ifdef HAVE_SYS_SOCKET_H
  27 #include <sys/socket.h>
  28 #endif
  29 #ifdef HAVE_NETINET_IN_H
  30 #include <netinet/in.h>
  31 #endif
  32 #ifdef HAVE_ARPA_INET_H
  33 #include <arpa/inet.h>
  34 #endif
  35 #include <string.h>
  36 #include <errno.h>
  37
  38 #include "inet_pton.h"
  39
  40 #define IN6ADDRSZ       16
  41 #define INADDRSZ         4
  42 #define INT16SZ          2
  43
  44 /*
  45  * WARNING: Don't even consider trying to compile this on a system where
  46  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  47  */
  48
  49 static int      inet_pton4(const char *src, unsigned char *dst);
  50 #ifdef ENABLE_IPV6
  51 static int      inet_pton6(const char *src, unsigned char *dst);
  52 #endif
  53
  54 /* int
  55  * inet_pton(af, src, dst)
  56  *      convert from presentation format (which usually means ASCII printable)
  57  *      to network format (which is usually some kind of binary format).
  58  * return:
  59  *      1 if the address was valid for the specified address family
  60  *      0 if the address wasn't valid (`dst' is untouched in this case)
  61  *      -1 if some other error occurred (`dst' is untouched in this case, too)
  62  * notice:
  63  *      On Windows we store the error in the thread errno, not
  64  *      in the winsock error code. This is to avoid loosing the
  65  *      actual last winsock error. So use macro ERRNO to fetch the
  66  *      errno this funtion sets when returning (-1), not SOCKERRNO.
  67  * author:
  68  *      Paul Vixie, 1996.
  69  */
  70 int
  71 Curl_inet_pton(int af, const char *src, void *dst)
  72 {
  73   switch (af) {
  74   case AF_INET:
  75     return (inet_pton4(src, (unsigned char *)dst));
  76 #ifdef ENABLE_IPV6
  77 #ifndef AF_INET6
  78 #define AF_INET6        (AF_MAX+1)        /* just to let this compile */
  79 #endif
  80   case AF_INET6:
  81     return (inet_pton6(src, (unsigned char *)dst));
  82 #endif
  83   default:
  84     SET_ERRNO(EAFNOSUPPORT);
  85     return (-1);
  86   }
  87   /* NOTREACHED */
  88 }
  89
  90 /* int
  91  * inet_pton4(src, dst)
  92  *      like inet_aton() but without all the hexadecimal and shorthand.
  93  * return:
  94  *      1 if `src' is a valid dotted quad, else 0.
  95  * notice:
  96  *      does not touch `dst' unless it's returning 1.
  97  * author:
  98  *      Paul Vixie, 1996.
  99  */
 100 static int
 101 inet_pton4(const char *src, unsigned char *dst)
 102 {
 103   static const char digits[] = "0123456789";
 104   int saw_digit, octets, ch;
 105   unsigned char tmp[INADDRSZ], *tp;
 106
 107   saw_digit = 0;
 108   octets = 0;
 109   tp = tmp;
 110   *tp = 0;
 111   while((ch = *src++) != '\0') {
 112     const char *pch;
 113
 114     if((pch = strchr(digits, ch)) != NULL) {
 115       unsigned int val = *tp * 10 + (unsigned int)(pch - digits);
 116
 117       if(val > 255)
 118         return (0);
 119       *tp = (unsigned char)val;
 120       if(! saw_digit) {
 121         if(++octets > 4)
 122           return (0);
 123         saw_digit = 1;
 124       }
 125     }
 126     else if(ch == '.' && saw_digit) {
 127       if(octets == 4)
 128         return (0);
 129       *++tp = 0;
 130       saw_digit = 0;
 131     }
 132     else
 133       return (0);
 134   }
 135   if(octets < 4)
 136     return (0);
 137   /* bcopy(tmp, dst, INADDRSZ); */
 138   memcpy(dst, tmp, INADDRSZ);
 139   return (1);
 140 }
 141
 142 #ifdef ENABLE_IPV6
 143 /* int
 144  * inet_pton6(src, dst)
 145  *      convert presentation level address to network order binary form.
 146  * return:
 147  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 148  * notice:
 149  *      (1) does not touch `dst' unless it's returning 1.
 150  *      (2) :: in a full address is silently ignored.
 151  * credit:
 152  *      inspired by Mark Andrews.
 153  * author:
 154  *      Paul Vixie, 1996.
 155  */
 156 static int
 157 inet_pton6(const char *src, unsigned char *dst)
 158 {
 159   static const char xdigits_l[] = "0123456789abcdef",
 160     xdigits_u[] = "0123456789ABCDEF";
 161   unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
 162   const char *xdigits, *curtok;
 163   int ch, saw_xdigit;
 164   unsigned int val;
 165
 166   memset((tp = tmp), 0, IN6ADDRSZ);
 167   endp = tp + IN6ADDRSZ;
 168   colonp = NULL;
 169   /* Leading :: requires some special handling. */
 170   if(*src == ':')
 171     if(*++src != ':')
 172       return (0);
 173   curtok = src;
 174   saw_xdigit = 0;
 175   val = 0;
 176   while((ch = *src++) != '\0') {
 177     const char *pch;
 178
 179     if((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
 180       pch = strchr((xdigits = xdigits_u), ch);
 181     if(pch != NULL) {
 182       val <<= 4;
 183       val |= (pch - xdigits);
 184       if(val > 0xffff)
 185         return (0);
 186       saw_xdigit = 1;
 187       continue;
 188     }
 189     if(ch == ':') {
 190       curtok = src;
 191       if(!saw_xdigit) {
 192         if(colonp)
 193           return (0);
 194         colonp = tp;
 195         continue;
 196       }
 197       if(tp + INT16SZ > endp)
 198         return (0);
 199       *tp++ = (unsigned char) (val >> 8) & 0xff;
 200       *tp++ = (unsigned char) val & 0xff;
 201       saw_xdigit = 0;
 202       val = 0;
 203       continue;
 204     }
 205     if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
 206         inet_pton4(curtok, tp) > 0) {
 207       tp += INADDRSZ;
 208       saw_xdigit = 0;
 209       break;    /* '\0' was seen by inet_pton4(). */
 210     }
 211     return (0);
 212   }
 213   if(saw_xdigit) {
 214     if(tp + INT16SZ > endp)
 215       return (0);
 216     *tp++ = (unsigned char) (val >> 8) & 0xff;
 217     *tp++ = (unsigned char) val & 0xff;
 218   }
 219   if(colonp != NULL) {
 220     /*
 221      * Since some memmove()'s erroneously fail to handle
 222      * overlapping regions, we'll do the shift by hand.
 223      */
 224     const int n = tp - colonp;
 225     int i;
 226
 227     for (i = 1; i <= n; i++) {
 228       endp[- i] = colonp[n - i];
 229       colonp[n - i] = 0;
 230     }
 231     tp = endp;
 232   }
 233   if(tp != endp)
 234     return (0);
 235   /* bcopy(tmp, dst, IN6ADDRSZ); */
 236   memcpy(dst, tmp, IN6ADDRSZ);
 237   return (1);
 238 }
 239 #endif /* ENABLE_IPV6 */
 240
 241 #endif /* HAVE_INET_PTON */