unbound/compat/inet_aton.c

   1 /* From openssh4.3p2 compat/inet_aton.c */
   2 /*
   3  * Copyright (c) 1983, 1990, 1993
   4  *    The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  * -
  30  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  31  *
  32  * Permission to use, copy, modify, and distribute this software for any
  33  * purpose with or without fee is hereby granted, provided that the above
  34  * copyright notice and this permission notice appear in all copies, and that
  35  * the name of Digital Equipment Corporation not be used in advertising or
  36  * publicity pertaining to distribution of the document or software without
  37  * specific, written prior permission.
  38  *
  39  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  40  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  41  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  42  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  43  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  44  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  45  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  46  * SOFTWARE.
  47  * -
  48  * --Copyright--
  49  */
  50
  51 /* OPENBSD ORIGINAL: lib/libc/net/inet_addr.c */
  52
  53 #include <config.h>
  54
  55 #if !defined(HAVE_INET_ATON)
  56
  57 #include <sys/types.h>
  58 #include <sys/param.h>
  59 #ifdef HAVE_NETINET_IN_H
  60 #include <netinet/in.h>
  61 #endif
  62 #ifdef HAVE_ARPA_INET_H
  63 #include <arpa/inet.h>
  64 #endif
  65 #include <ctype.h>
  66
  67 #if 0
  68 /*
  69  * Ascii internet address interpretation routine.
  70  * The value returned is in network order.
  71  */
  72 in_addr_t
  73 inet_addr(const char *cp)
  74 {
  75         struct in_addr val;
  76
  77         if (inet_aton(cp, &val))
  78                 return (val.s_addr);
  79         return (INADDR_NONE);
  80 }
  81 #endif
  82
  83 /*
  84  * Check whether "cp" is a valid ascii representation
  85  * of an Internet address and convert to a binary address.
  86  * Returns 1 if the address is valid, 0 if not.
  87  * This replaces inet_addr, the return value from which
  88  * cannot distinguish between failure and a local broadcast address.
  89  */
  90 int
  91 inet_aton(const char *cp, struct in_addr *addr)
  92 {
  93         uint32_t val;
  94         int base, n;
  95         char c;
  96         unsigned int parts[4];
  97         unsigned int *pp = parts;
  98
  99         c = *cp;
 100         for (;;) {
 101                 /*
 102                  * Collect number up to ``.''.
 103                  * Values are specified as for C:
 104                  * 0x=hex, 0=octal, isdigit=decimal.
 105                  */
 106                 if (!isdigit((unsigned char)c))
 107                         return (0);
 108                 val = 0; base = 10;
 109                 if (c == '0') {
 110                         c = *++cp;
 111                         if (c == 'x' || c == 'X')
 112                                 base = 16, c = *++cp;
 113                         else
 114                                 base = 8;
 115                 }
 116                 for (;;) {
 117                         if (isascii((unsigned char)c) && isdigit((unsigned char)c)) {
 118                                 val = (val * base) + (c - '0');
 119                                 c = *++cp;
 120                         } else if (base == 16 && isascii((unsigned char)c) && isxdigit((unsigned char)c)) {
 121                                 val = (val << 4) |
 122                                         (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
 123                                 c = *++cp;
 124                         } else
 125                                 break;
 126                 }
 127                 if (c == '.') {
 128                         /*
 129                          * Internet format:
 130                          *      a.b.c.d
 131                          *      a.b.c   (with c treated as 16 bits)
 132                          *      a.b     (with b treated as 24 bits)
 133                          */
 134                         if (pp >= parts + 3)
 135                                 return (0);
 136                         *pp++ = val;
 137                         c = *++cp;
 138                 } else
 139                         break;
 140         }
 141         /*
 142          * Check for trailing characters.
 143          */
 144         if (c != '\0' && (!isascii((unsigned char)c) || !isspace((unsigned char)c)))
 145                 return (0);
 146         /*
 147          * Concoct the address according to
 148          * the number of parts specified.
 149          */
 150         n = pp - parts + 1;
 151         switch (n) {
 152
 153         case 0:
 154                 return (0);             /* initial nondigit */
 155
 156         case 1:                         /* a -- 32 bits */
 157                 break;
 158
 159         case 2:                         /* a.b -- 8.24 bits */
 160                 if ((val > 0xffffff) || (parts[0] > 0xff))
 161                         return (0);
 162                 val |= parts[0] << 24;
 163                 break;
 164
 165         case 3:                         /* a.b.c -- 8.8.16 bits */
 166                 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
 167                         return (0);
 168                 val |= (parts[0] << 24) | (parts[1] << 16);
 169                 break;
 170
 171         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 172                 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
 173                         return (0);
 174                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 175                 break;
 176         }
 177         if (addr)
 178                 addr->s_addr = htonl(val);
 179         return (1);
 180 }
 181
 182 #endif /* !defined(HAVE_INET_ATON) */