1/*
2 * Copyright (c) 1996, 1998 by Internet Software Consortium.
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
15 * SOFTWARE.
16 */
17
18#include <sys/types.h>
19#include <sys/param.h>
20#include <sys/socket.h>
21#include <netinet/in.h>
22#include <arpa/inet.h>
23#include <arpa/nameser.h>
24#include <ctype.h>
25#include <resolv.h>
26
27static char
28xtob(
29	register int c
30	)
31{
32	return (char)(c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
33}
34
35u_int
36inet_nsap_addr(
37	const char *ascii,
38	u_char *binary,
39	int maxlen
40	)
41{
42	u_char c, nib;
43	u_int len = 0;
44
45	while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
46		if (c == '.' || c == '+' || c == '/')
47			continue;
48		if (!isascii(c))
49			return (0);
50		if (islower(c))
51			c = (u_char)( toupper(c));
52		if (isxdigit(c)) {
53			nib = xtob(c);
54			c = *ascii++;
55			if (c != '\0') {
56				c = (u_char)( toupper(c));
57				if (isxdigit(c)) {
58					*binary++ = (nib << 4) | xtob(c);
59					len++;
60				} else
61					return (0);
62			}
63			else
64				return (0);
65		}
66		else
67			return (0);
68	}
69	return (len);
70}
71
72char *
73inet_nsap_ntoa(
74	int binlen,
75	register const u_char *binary,
76	register char *ascii
77	)
78{
79	register int nib;
80	int i;
81	static char tmpbuf[255*3];
82	char *start;
83
84	if (ascii)
85		start = ascii;
86	else {
87		ascii = tmpbuf;
88		start = tmpbuf;
89	}
90
91	if (binlen > 255)
92		binlen = 255;
93
94	for (i = 0; i < binlen; i++) {
95		nib = *binary >> 4;
96		*ascii++ = (char)( nib + (nib < 10 ? '0' : '7'));
97		nib = *binary++ & 0x0f;
98		*ascii++ = (char)( nib + (nib < 10 ? '0' : '7'));
99		if (((i % 2) == 0 && (i + 1) < binlen))
100			*ascii++ = '.';
101	}
102	*ascii = '\0';
103	return (start);
104}
105