crypto/openssh-3.8.1p1/openbsd-compat/inet_aton.c

   1 /* OPENBSD ORIGINAL: lib/libc/net/inet_addr.c */
   2
   3 /*      $OpenBSD: inet_addr.c,v 1.7 2003/06/02 20:18:35 millert Exp $   */
   4
   5 /*
   6  * Copyright (c) 1983, 1990, 1993
   7  *    The Regents of the University of California.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  * -
  33  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  34  *
  35  * Permission to use, copy, modify, and distribute this software for any
  36  * purpose with or without fee is hereby granted, provided that the above
  37  * copyright notice and this permission notice appear in all copies, and that
  38  * the name of Digital Equipment Corporation not be used in advertising or
  39  * publicity pertaining to distribution of the document or software without
  40  * specific, written prior permission.
  41  *
  42  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  43  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  44  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  45  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  46  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  47  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  48  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  49  * SOFTWARE.
  50  * -
  51  * --Copyright--
  52  */
  53
  54 #include "includes.h"
  55
  56 #if !defined(HAVE_INET_ATON)
  57
  58 #if defined(LIBC_SCCS) && !defined(lint)
  59 #if 0
  60 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
  61 static char rcsid[] = "$From: inet_addr.c,v 8.5 1996/08/05 08:31:35 vixie Exp $";
  62 #else
  63 static char rcsid[] = "$OpenBSD: inet_addr.c,v 1.7 2003/06/02 20:18:35 millert Exp $";
  64 #endif
  65 #endif /* LIBC_SCCS and not lint */
  66
  67 #include <sys/types.h>
  68 #include <sys/param.h>
  69 #include <netinet/in.h>
  70 #include <arpa/inet.h>
  71 #include <ctype.h>
  72
  73 #if 0
  74 /*
  75  * Ascii internet address interpretation routine.
  76  * The value returned is in network order.
  77  */
  78 in_addr_t
  79 inet_addr(cp)
  80         register const char *cp;
  81 {
  82         struct in_addr val;
  83
  84         if (inet_aton(cp, &val))
  85                 return (val.s_addr);
  86         return (INADDR_NONE);
  87 }
  88 #endif
  89
  90 /*
  91  * Check whether "cp" is a valid ascii representation
  92  * of an Internet address and convert to a binary address.
  93  * Returns 1 if the address is valid, 0 if not.
  94  * This replaces inet_addr, the return value from which
  95  * cannot distinguish between failure and a local broadcast address.
  96  */
  97 int
  98 inet_aton(const char *cp, struct in_addr *addr)
  99 {
 100         register u_int32_t val;
 101         register int base, n;
 102         register char c;
 103         unsigned int parts[4];
 104         register unsigned int *pp = parts;
 105
 106         c = *cp;
 107         for (;;) {
 108                 /*
 109                  * Collect number up to ``.''.
 110                  * Values are specified as for C:
 111                  * 0x=hex, 0=octal, isdigit=decimal.
 112                  */
 113                 if (!isdigit(c))
 114                         return (0);
 115                 val = 0; base = 10;
 116                 if (c == '0') {
 117                         c = *++cp;
 118                         if (c == 'x' || c == 'X')
 119                                 base = 16, c = *++cp;
 120                         else
 121                                 base = 8;
 122                 }
 123                 for (;;) {
 124                         if (isascii(c) && isdigit(c)) {
 125                                 val = (val * base) + (c - '0');
 126                                 c = *++cp;
 127                         } else if (base == 16 && isascii(c) && isxdigit(c)) {
 128                                 val = (val << 4) |
 129                                         (c + 10 - (islower(c) ? 'a' : 'A'));
 130                                 c = *++cp;
 131                         } else
 132                                 break;
 133                 }
 134                 if (c == '.') {
 135                         /*
 136                          * Internet format:
 137                          *      a.b.c.d
 138                          *      a.b.c   (with c treated as 16 bits)
 139                          *      a.b     (with b treated as 24 bits)
 140                          */
 141                         if (pp >= parts + 3)
 142                                 return (0);
 143                         *pp++ = val;
 144                         c = *++cp;
 145                 } else
 146                         break;
 147         }
 148         /*
 149          * Check for trailing characters.
 150          */
 151         if (c != '\0' && (!isascii(c) || !isspace(c)))
 152                 return (0);
 153         /*
 154          * Concoct the address according to
 155          * the number of parts specified.
 156          */
 157         n = pp - parts + 1;
 158         switch (n) {
 159
 160         case 0:
 161                 return (0);             /* initial nondigit */
 162
 163         case 1:                         /* a -- 32 bits */
 164                 break;
 165
 166         case 2:                         /* a.b -- 8.24 bits */
 167                 if ((val > 0xffffff) || (parts[0] > 0xff))
 168                         return (0);
 169                 val |= parts[0] << 24;
 170                 break;
 171
 172         case 3:                         /* a.b.c -- 8.8.16 bits */
 173                 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
 174                         return (0);
 175                 val |= (parts[0] << 24) | (parts[1] << 16);
 176                 break;
 177
 178         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 179                 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff))
 180                         return (0);
 181                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 182                 break;
 183         }
 184         if (addr)
 185                 addr->s_addr = htonl(val);
 186         return (1);
 187 }
 188
 189 #endif /* !defined(HAVE_INET_ATON) */