winsup/cygwin/libc/inet_addr.c

   1 /*
   2  * Copyright (c) 1983, 1990, 1993
   3  *    The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /*
  31  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  32  *
  33  * Permission to use, copy, modify, and distribute this software for any
  34  * purpose with or without fee is hereby granted, provided that the above
  35  * copyright notice and this permission notice appear in all copies, and that
  36  * the name of Digital Equipment Corporation not be used in advertising or
  37  * publicity pertaining to distribution of the document or software without
  38  * specific, written prior permission.
  39  *
  40  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  41  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  42  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  43  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  44  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  45  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  46  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  47  * SOFTWARE.
  48  */
  49
  50 /*
  51  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  52  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  53  *
  54  * Permission to use, copy, modify, and distribute this software for any
  55  * purpose with or without fee is hereby granted, provided that the above
  56  * copyright notice and this permission notice appear in all copies.
  57  *
  58  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  59  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  60  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  61  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  62  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  63  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  64  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  65  */
  66
  67 #if defined(LIBC_SCCS) && !defined(lint)
  68 static const char sccsid[] = "@(#)inet_addr.c   8.1 (Berkeley) 6/17/93";
  69 static const char rcsid[] = "$Id$";
  70 #endif /* LIBC_SCCS and not lint */
  71 #include <sys/cdefs.h>
  72 #ifndef __CYGWIN__
  73 __FBSDID("$FreeBSD$");
  74 #else
  75 #include "winsup.h"
  76 #endif
  77
  78 #ifndef __CYGWIN__
  79 #include "port_before.h"
  80 #endif
  81
  82 #include <sys/types.h>
  83 #include <sys/param.h>
  84
  85 #include <netinet/in.h>
  86 #include <arpa/inet.h>
  87
  88 #include <ctype.h>
  89
  90 #ifndef __CYGWIN__
  91 #include "port_after.h"
  92 #endif
  93
  94 /*
  95  * Check whether "cp" is a valid ascii representation
  96  * of an Internet address and convert to a binary address.
  97  * Returns 1 if the address is valid, 0 if not.
  98  * This replaces inet_addr, the return value from which
  99  * cannot distinguish between failure and a local broadcast address.
 100  */
 101 extern int
 102 cygwin_inet_aton(const char *cp, struct in_addr *addr) {
 103         u_int32_t val;
 104         int base, n;
 105         char c;
 106         u_int8_t parts[4];
 107         u_int8_t *pp = parts;
 108         int digit;
 109
 110         c = *cp;
 111         for (;;) {
 112                 /*
 113                  * Collect number up to ``.''.
 114                  * Values are specified as for C:
 115                  * 0x=hex, 0=octal, isdigit=decimal.
 116                  */
 117                 if (!isdigit((unsigned char)c))
 118                         return (0);
 119                 val = 0; base = 10; digit = 0;
 120                 if (c == '0') {
 121                         c = *++cp;
 122                         if (c == 'x' || c == 'X')
 123                                 base = 16, c = *++cp;
 124                         else {
 125                                 base = 8;
 126                                 digit = 1 ;
 127                         }
 128                 }
 129                 for (;;) {
 130                         if (isascii(c) && isdigit((unsigned char)c)) {
 131                                 if (base == 8 && (c == '8' || c == '9'))
 132                                         return (0);
 133                                 val = (val * base) + (c - '0');
 134                                 c = *++cp;
 135                                 digit = 1;
 136                         } else if (base == 16 && isascii(c) &&
 137                                    isxdigit((unsigned char)c)) {
 138                                 val = (val << 4) |
 139                                         (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
 140                                 c = *++cp;
 141                                 digit = 1;
 142                         } else
 143                                 break;
 144                 }
 145                 if (c == '.') {
 146                         /*
 147                          * Internet format:
 148                          *      a.b.c.d
 149                          *      a.b.c   (with c treated as 16 bits)
 150                          *      a.b     (with b treated as 24 bits)
 151                          */
 152                         if (pp >= parts + 3 || val > 0xffU)
 153                                 return (0);
 154                         *pp++ = val;
 155                         c = *++cp;
 156                 } else
 157                         break;
 158         }
 159         /*
 160          * Check for trailing characters.
 161          */
 162         if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c)))
 163                 return (0);
 164         /*
 165          * Did we get a valid digit?
 166          */
 167         if (!digit)
 168                 return (0);
 169         /*
 170          * Concoct the address according to
 171          * the number of parts specified.
 172          */
 173         n = pp - parts + 1;
 174         switch (n) {
 175         case 1:                         /* a -- 32 bits */
 176                 break;
 177
 178         case 2:                         /* a.b -- 8.24 bits */
 179                 if (val > 0xffffffU)
 180                         return (0);
 181                 val |= parts[0] << 24;
 182                 break;
 183
 184         case 3:                         /* a.b.c -- 8.8.16 bits */
 185                 if (val > 0xffffU)
 186                         return (0);
 187                 val |= (parts[0] << 24) | (parts[1] << 16);
 188                 break;
 189
 190         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 191                 if (val > 0xffU)
 192                         return (0);
 193                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 194                 break;
 195         }
 196         if (addr != NULL)
 197                 addr->s_addr = htonl(val);
 198         return (1);
 199 }
 200
 201 /*
 202  * Ascii internet address interpretation routine.
 203  * The value returned is in network order.
 204  */
 205 in_addr_t               /* XXX should be struct in_addr :( */
 206 cygwin_inet_addr(const char *cp) {
 207         struct in_addr val;
 208
 209         if (cygwin_inet_aton(cp, &val))
 210                 return (val.s_addr);
 211         return (INADDR_NONE);
 212 }
 213
 214 #ifndef __CYGWIN__
 215 /*
 216  * Weak aliases for applications that use certain private entry points,
 217  * and fail to include <arpa/inet.h>.
 218  */
 219 #undef inet_addr
 220 __weak_reference(__inet_addr, inet_addr);
 221 #undef inet_aton
 222 __weak_reference(__inet_aton, inet_aton);
 223 #endif