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nsap_addr.c revision 1.1
      1 /*	$NetBSD: nsap_addr.c,v 1.1 2004/05/20 22:29:02 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
      5  * Copyright (c) 1996-1999 by Internet Software Consortium.
      6  *
      7  * Permission to use, copy, modify, and distribute this software for any
      8  * purpose with or without fee is hereby granted, provided that the above
      9  * copyright notice and this permission notice appear in all copies.
     10  *
     11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
     12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     13  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
     14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
     17  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     18  */
     19 
     20 #if defined(LIBC_SCCS) && !defined(lint)
     21 static const char rcsid[] = "Id: nsap_addr.c,v 1.2.206.1 2004/03/09 08:33:33 marka Exp";
     22 #endif /* LIBC_SCCS and not lint */
     23 
     24 #include "port_before.h"
     25 
     26 #include <sys/types.h>
     27 #include <sys/param.h>
     28 #include <sys/socket.h>
     29 
     30 #include <netinet/in.h>
     31 #include <arpa/inet.h>
     32 #include <arpa/nameser.h>
     33 
     34 #include <ctype.h>
     35 #include <resolv.h>
     36 
     37 #include "port_after.h"
     38 
     39 static char
     40 xtob(int c) {
     41 	return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
     42 }
     43 
     44 u_int
     45 inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
     46 	u_char c, nib;
     47 	u_int len = 0;
     48 
     49 	if (ascii[0] != '0' || (ascii[1] != 'x' && ascii[1] != 'X'))
     50 		return (0);
     51 	ascii += 2;
     52 
     53 	while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
     54 		if (c == '.' || c == '+' || c == '/')
     55 			continue;
     56 		if (!isascii(c))
     57 			return (0);
     58 		if (islower(c))
     59 			c = toupper(c);
     60 		if (isxdigit(c)) {
     61 			nib = xtob(c);
     62 			c = *ascii++;
     63 			if (c != '\0') {
     64 				c = toupper(c);
     65 				if (isxdigit(c)) {
     66 					*binary++ = (nib << 4) | xtob(c);
     67 					len++;
     68 				} else
     69 					return (0);
     70 			}
     71 			else
     72 				return (0);
     73 		}
     74 		else
     75 			return (0);
     76 	}
     77 	return (len);
     78 }
     79 
     80 char *
     81 inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
     82 	int nib;
     83 	int i;
     84 	static char tmpbuf[2+255*3];
     85 	char *start;
     86 
     87 	if (ascii)
     88 		start = ascii;
     89 	else {
     90 		ascii = tmpbuf;
     91 		start = tmpbuf;
     92 	}
     93 
     94 	*ascii++ = '0';
     95 	*ascii++ = 'x';
     96 
     97 	if (binlen > 255)
     98 		binlen = 255;
     99 
    100 	for (i = 0; i < binlen; i++) {
    101 		nib = *binary >> 4;
    102 		*ascii++ = nib + (nib < 10 ? '0' : '7');
    103 		nib = *binary++ & 0x0f;
    104 		*ascii++ = nib + (nib < 10 ? '0' : '7');
    105 		if (((i % 2) == 0 && (i + 1) < binlen))
    106 			*ascii++ = '.';
    107 	}
    108 	*ascii = '\0';
    109 	return (start);
    110 }
    111