1/*	$NetBSD: nsap_addr.c,v 1.6 2009/04/12 17:07:17 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#include <sys/cdefs.h>
21#if defined(LIBC_SCCS) && !defined(lint)
22#if 0
23static const char rcsid[] = "Id: nsap_addr.c,v 1.5 2005/07/28 06:51:48 marka Exp";
24#else
25__RCSID("$NetBSD: nsap_addr.c,v 1.6 2009/04/12 17:07:17 christos Exp $");
26#endif
27#endif /* LIBC_SCCS and not lint */
28
29#include "port_before.h"
30
31#include <sys/types.h>
32#include <sys/param.h>
33#include <sys/socket.h>
34
35#include <netinet/in.h>
36#include <arpa/inet.h>
37#include <arpa/nameser.h>
38
39#include <assert.h>
40#include <ctype.h>
41#include <resolv.h>
42#include <resolv_mt.h>
43
44#include "port_after.h"
45
46static char
47xtob(int c) {
48	return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
49}
50
51u_int
52inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
53	u_char c, nib;
54	u_int len = 0;
55
56	assert(ascii != NULL);
57	assert(binary != NULL);
58
59	if (ascii[0] != '0' || (ascii[1] != 'x' && ascii[1] != 'X'))
60		return (0);
61	ascii += 2;
62
63	while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
64		if (c == '.' || c == '+' || c == '/')
65			continue;
66		if (!isascii(c))
67			return (0);
68		if (islower(c))
69			c = toupper(c);
70		if (isxdigit(c)) {
71			nib = xtob(c);
72			c = *ascii++;
73			if (c != '\0') {
74				c = toupper(c);
75				if (isxdigit(c)) {
76					*binary++ = (nib << 4) | xtob(c);
77					len++;
78				} else
79					return (0);
80			}
81			else
82				return (0);
83		}
84		else
85			return (0);
86	}
87	return (len);
88}
89
90char *
91inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
92	int nib;
93	int i;
94	char *tmpbuf = inet_nsap_ntoa_tmpbuf;
95	char *start;
96
97	assert(binary != NULL);
98
99	if (ascii)
100		start = ascii;
101	else {
102		ascii = tmpbuf;
103		start = tmpbuf;
104	}
105
106	*ascii++ = '0';
107	*ascii++ = 'x';
108
109	if (binlen > 255)
110		binlen = 255;
111
112	for (i = 0; i < binlen; i++) {
113		nib = (u_int32_t)*binary >> 4;
114		*ascii++ = nib + (nib < 10 ? '0' : '7');
115		nib = *binary++ & 0x0f;
116		*ascii++ = nib + (nib < 10 ? '0' : '7');
117		if (((i % 2) == 0 && (i + 1) < binlen))
118			*ascii++ = '.';
119	}
120	*ascii = '\0';
121	return (start);
122}
123
124#undef inet_nsap_addr
125#pragma weak inet_nsap_addr = __inet_nsap_addr
126#undef inet_nsap_ntoa
127#pragma weak inet_nsap_ntoa = __inet_nsap_ntoa
128