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      1 /*	$NetBSD: type_ipv6.c,v 1.10 2004/11/24 11:57:09 blymn Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998-1999 Brett Lymn
      5  *                         (blymn (at) baea.com.au, brett_lymn (at) 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 (at) 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 1.10 2004/11/24 11:57:09 blymn 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 
    124