1/*-
2 * SPDX-License-Identifier: ISC
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 "port_before.h"
21
22#include <sys/param.h>
23#include <sys/socket.h>
24
25#include <netinet/in.h>
26#include <arpa/inet.h>
27#include <arpa/nameser.h>
28
29#include <ctype.h>
30#include <resolv.h>
31#include <resolv_mt.h>
32
33#include "port_after.h"
34
35static char
36xtob(int c) {
37	return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
38}
39
40u_int
41inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
42	u_char c, nib;
43	u_int len = 0;
44
45	if (ascii[0] != '0' || (ascii[1] != 'x' && ascii[1] != 'X'))
46		return (0);
47	ascii += 2;
48
49	while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
50		if (c == '.' || c == '+' || c == '/')
51			continue;
52		if (!isascii(c))
53			return (0);
54		if (islower(c))
55			c = toupper(c);
56		if (isxdigit(c)) {
57			nib = xtob(c);
58			c = *ascii++;
59			if (c != '\0') {
60				c = toupper(c);
61				if (isxdigit(c)) {
62					*binary++ = (nib << 4) | xtob(c);
63					len++;
64				} else
65					return (0);
66			}
67			else
68				return (0);
69		}
70		else
71			return (0);
72	}
73	return (len);
74}
75
76char *
77inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
78	int nib;
79	int i;
80	char *tmpbuf = inet_nsap_ntoa_tmpbuf;
81	char *start;
82
83	if (ascii)
84		start = ascii;
85	else {
86		ascii = tmpbuf;
87		start = tmpbuf;
88	}
89
90	*ascii++ = '0';
91	*ascii++ = 'x';
92
93	if (binlen > 255)
94		binlen = 255;
95
96	for (i = 0; i < binlen; i++) {
97		nib = *binary >> 4;
98		*ascii++ = nib + (nib < 10 ? '0' : '7');
99		nib = *binary++ & 0x0f;
100		*ascii++ = nib + (nib < 10 ? '0' : '7');
101		if (((i % 2) == 0 && (i + 1) < binlen))
102			*ascii++ = '.';
103	}
104	*ascii = '\0';
105	return (start);
106}
107
108/*
109 * Weak aliases for applications that use certain private entry points,
110 * and fail to include <arpa/inet.h>.
111 */
112#undef inet_nsap_addr
113__weak_reference(__inet_nsap_addr, inet_nsap_addr);
114#undef inet_nsap_ntoa
115__weak_reference(__inet_nsap_ntoa, inet_nsap_ntoa);
116
117/*! \file */
118