lib/libform/type_ipv6.c

   1 /*      $NetBSD: type_ipv6.c,v 1.9 2004/11/16 06:04:13 itojun Exp $     */
   2
   3 /*-
   4  * Copyright (c) 1998-1999 Brett Lymn
   5  *                         (blymn@baea.com.au, brett_lymn@yahoo.com.au)
   6  * All rights reserved.
   7  *
   8  * This code has been donated to The NetBSD Foundation by the Author.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * Many thanks to Jun-ichiro itojun Hagino <itojun@NetBSD.org> for providing
  30  * the sample code for the check field function, this function is 99.999%
  31  * his code.
  32  *
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __RCSID("$NetBSD: type_ipv6.c,v 1.9 2004/11/16 06:04:13 itojun Exp $");
  37
  38 #include <sys/types.h>
  39 #include <sys/socket.h>
  40 #include <ctype.h>
  41 #include <netdb.h>
  42 #include <string.h>
  43 #include "form.h"
  44 #include "internals.h"
  45
  46 /*
  47  * The IP v6 address type handling.
  48  */
  49
  50 /*
  51  * Check the contents of the field buffer are a valid Ipv6 address only.
  52  */
  53 static int
  54 ipv6_check_field(FIELD *field, char *args)
  55 {
  56         char cleaned[NI_MAXHOST];
  57         struct addrinfo hints, *res;
  58         const int niflags = NI_NUMERICHOST;
  59
  60         if (args == NULL)
  61                 return FALSE;
  62
  63         memset(&hints, 0, sizeof(hints));
  64         hints.ai_family = AF_INET6;
  65         hints.ai_socktype = SOCK_DGRAM; /* dummy */
  66         hints.ai_flags = AI_NUMERICHOST;
  67
  68         if (getaddrinfo(args, "0", &hints, &res) != 0) {
  69                   /* no it is not an IPv6 address */
  70                 return FALSE;
  71         }
  72
  73         if (res->ai_next) {
  74                   /* somehow the address resolved to multiple
  75                    *  addresses - strange
  76                    */
  77                 freeaddrinfo(res);
  78                 return FALSE;
  79         }
  80
  81         if (getnameinfo(res->ai_addr, res->ai_addrlen, cleaned,
  82                         (socklen_t) sizeof(cleaned), NULL, 0, niflags) != 0) {
  83                 freeaddrinfo(res);
  84                 return FALSE;
  85         }
  86
  87         freeaddrinfo(res);
  88
  89           /*
  90            * now we are sure host is an IPv6 address literal, and "cleaned"
  91            * has the uniformly-formatted IPv6 address literal.  Re-set the
  92            * field buffer to be the reformatted IPv6 address
  93            */
  94         set_field_buffer(field, 0, cleaned);
  95
  96         return TRUE;
  97 }
  98
  99 /*
 100  * Check the given character is numeric, return TRUE if it is.
 101  */
 102 static int
 103 ipv6_check_char(/* ARGSUSED1 */ int c, char *args)
 104 {
 105         return (isxdigit(c) || (c == '.') || (c == ':')) ? TRUE : FALSE;
 106 }
 107
 108 static FIELDTYPE builtin_ipv6 = {
 109         _TYPE_IS_BUILTIN,                   /* flags */
 110         0,                                  /* refcount */
 111         NULL,                               /* link */
 112         NULL,                               /* make_args */
 113         NULL,                               /* copy_args */
 114         NULL,                               /* free_args */
 115         ipv6_check_field,                   /* field_check */
 116         ipv6_check_char,                    /* char_check */
 117         NULL,                               /* next_choice */
 118         NULL                                /* prev_choice */
 119 };
 120
 121 FIELDTYPE *TYPE_IPV6 = &builtin_ipv6;
 122
 123