usr/src/lib/libc/port/nsl/inet_pton.c

   1 /*
   2  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 /*
   7  * Copyright (c) 1996 by Internet Software Consortium.
   8  *
   9  * Permission to use, copy, modify, and distribute this software for any
  10  * purpose with or without fee is hereby granted, provided that the above
  11  * copyright notice and this permission notice appear in all copies.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
  14  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  16  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  17  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  18  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  19  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  20  * SOFTWARE.
  21  */
  22
  23 #pragma ident   "%Z%%M% %I%     %E% SMI"
  24
  25 #include "mt.h"
  26 #include <stdlib.h>
  27 #include <ctype.h>
  28 #include <string.h>
  29 #include <strings.h>
  30 #include <netdb.h>
  31 #include <stdio.h>
  32 #include <arpa/inet.h>
  33 #include <netinet/in.h>
  34 #include <sys/socket.h>
  35 #include <errno.h>
  36
  37 static int      inet_pton4(const char *src, uchar_t *dst);
  38 static int      inet_pton6(const char *src, uchar_t *dst);
  39
  40 /*
  41  * int
  42  * inet_pton(af, src, dst)
  43  *      convert from presentation format (which usually means ASCII printable)
  44  *      to network format (which is usually some kind of binary format).
  45  * return:
  46  *      1 if the address was valid for the specified address family
  47  *      0 if the address wasn't valid (`dst' is untouched in this case)
  48  *      -1 if some other error occurred (`dst' is untouched in this case, too)
  49  * author:
  50  *      Paul Vixie, 1996.  Taken from on297-gate:dns stuff
  51  */
  52 int
  53 inet_pton(int af, const char *src, void *dst)
  54 {
  55         switch (af) {
  56         case AF_INET:
  57                 return (inet_pton4(src, dst));
  58         case AF_INET6:
  59                 return (inet_pton6(src, dst));
  60         default:
  61                 errno = EAFNOSUPPORT;
  62                 return (-1);
  63         }
  64         /* NOTREACHED */
  65 }
  66
  67 /*
  68  * int
  69  * inet_pton4(src, dst)
  70  *      like inet_aton() but without all the hexadecimal and shorthand.
  71  * return:
  72  *      1 if `src' is a valid dotted quad, else 0.
  73  * notice:
  74  *      does not touch `dst' unless it's returning 1.
  75  *
  76  */
  77 #define INADDRSZ        4
  78 #define IN6ADDRSZ       16
  79 #define INT16SZ         2
  80
  81 static int
  82 inet_pton4(const char *src, uchar_t *dst)
  83 {
  84         static const char digits[] = "0123456789";
  85         int saw_digit, octets, ch;
  86         uchar_t tmp[INADDRSZ], *tp;
  87
  88         saw_digit = 0;
  89         octets = 0;
  90         *(tp = tmp) = 0;
  91         while ((ch = *src++) != '\0') {
  92                 const char *pch;
  93
  94                 if ((pch = strchr(digits, ch)) != NULL) {
  95                         uint_t new = *tp * 10 + (pch - digits);
  96
  97                         if (new > 255)
  98                                 return (0);
  99                         *tp = new;
 100                         if (!saw_digit) {
 101                                 if (++octets > 4)
 102                                         return (0);
 103                                 saw_digit = 1;
 104                         }
 105                 } else if (ch == '.' && saw_digit) {
 106                         if (octets == 4)
 107                                 return (0);
 108                         *++tp = 0;
 109                         saw_digit = 0;
 110                 } else
 111                         return (0);
 112         }
 113         if (octets < 4)
 114                 return (0);
 115
 116         (void) memcpy(dst, tmp, INADDRSZ);
 117         return (1);
 118 }
 119
 120
 121 /*
 122  * int
 123  * inet_pton6(src, dst)
 124  *      convert presentation level address to network order binary form.
 125  * return:
 126  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 127  * notice:
 128  *      (1) does not touch `dst' unless it's returning 1.
 129  *      (2) :: in a full address is silently ignored.
 130  * credit:
 131  *      inspired by Mark Andrews.
 132  *
 133  */
 134
 135
 136 static int
 137 inet_pton6(const char *src, uchar_t *dst)
 138 {
 139         static const char xdigits_l[] = "0123456789abcdef",
 140                         xdigits_u[] = "0123456789ABCDEF";
 141         uchar_t tmp[IN6ADDRSZ], *tp, *endp, *colonp;
 142         const char *xdigits, *curtok;
 143         int ch, saw_xdigit;
 144         uint_t val;
 145
 146         (void) memset((tp = tmp), '\0', IN6ADDRSZ);
 147         endp = tp + IN6ADDRSZ;
 148         colonp = NULL;
 149         /* Leading :: requires some special handling. */
 150         if (*src == ':')
 151                 if (*++src != ':')
 152                         return (0);
 153         curtok = src;
 154         saw_xdigit = 0;
 155         val = 0;
 156         while ((ch = *src++) != '\0') {
 157                 const char *pch;
 158
 159                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
 160                         pch = strchr((xdigits = xdigits_u), ch);
 161                 if (pch != NULL) {
 162                         val <<= 4;
 163                         val |= (pch - xdigits);
 164                         if (val > 0xffff)
 165                                 return (0);
 166                         saw_xdigit = 1;
 167                         continue;
 168                 }
 169                 if (ch == ':') {
 170                         curtok = src;
 171                         if (!saw_xdigit) {
 172                                 if (colonp)
 173                                         return (0);
 174                                 colonp = tp;
 175                                 continue;
 176                         } else if (*src == '\0') {
 177                                 return (0);
 178                         }
 179                         if (tp + INT16SZ > endp)
 180                                 return (0);
 181                         *tp++ = (uchar_t)(val >> 8) & 0xff;
 182                         *tp++ = (uchar_t)val & 0xff;
 183                         saw_xdigit = 0;
 184                         val = 0;
 185                         continue;
 186                 }
 187                 if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
 188                     inet_pton4(curtok, tp) > 0) {
 189                         tp += INADDRSZ;
 190                         saw_xdigit = 0;
 191                         break;  /* '\0' was seen by inet_pton4(). */
 192                 }
 193                 return (0);
 194         }
 195         if (saw_xdigit) {
 196                 if (tp + INT16SZ > endp)
 197                         return (0);
 198                 *tp++ = (uchar_t)(val >> 8) & 0xff;
 199                 *tp++ = (uchar_t)val & 0xff;
 200         }
 201         if (colonp != NULL) {
 202                 /*
 203                  * Since some memmove()'s erroneously fail to handle
 204                  * overlapping regions, we'll do the shift by hand.
 205                  */
 206                 const int n = tp - colonp;
 207                 int i;
 208
 209                 if (tp == endp)
 210                         return (0);
 211                 for (i = 1; i <= n; i++) {
 212                         endp[- i] = colonp[n - i];
 213                         colonp[n - i] = 0;
 214                 }
 215                 tp = endp;
 216         }
 217         if (tp != endp)
 218                 return (0);
 219         (void) memcpy(dst, tmp, IN6ADDRSZ);
 220         return (1);
 221 }