1/*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996-1999 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#if defined(LIBC_SCCS) && !defined(lint)
19static const char rcsid[] = "$Id: nsap_addr.c,v 1.5 2005/07/28 06:51:48 marka Exp $";
20#endif /* LIBC_SCCS and not lint */
21#include <sys/cdefs.h>
22__FBSDID("$FreeBSD$");
23
24#include "port_before.h"
25
26#include <sys/param.h>
27#include <sys/socket.h>
28
29#include <netinet/in.h>
30#include <arpa/inet.h>
31#include <arpa/nameser.h>
32
33#include <ctype.h>
34#include <resolv.h>
35#include <resolv_mt.h>
36
37#include "port_after.h"
38
39static char
40xtob(int c) {
41	return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
42}
43
44u_int
45inet_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
80char *
81inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
82	int nib;
83	int i;
84	char *tmpbuf = inet_nsap_ntoa_tmpbuf;
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
112/*
113 * Weak aliases for applications that use certain private entry points,
114 * and fail to include <arpa/inet.h>.
115 */
116#undef inet_nsap_addr
117__weak_reference(__inet_nsap_addr, inet_nsap_addr);
118#undef inet_nsap_ntoa
119__weak_reference(__inet_nsap_ntoa, inet_nsap_ntoa);
120
121/*! \file */
122