nsap_addr.c revision 270838 
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: stable/10/lib/libc/inet/nsap_addr.c 270838 2014-08-30 10:16:25Z ume $");
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#include <resolv_mt.h>
37
38#include "port_after.h"
39
40static char
41xtob(int c) {
42	return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
43}
44
45u_int
46inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
47	u_char c, nib;
48	u_int len = 0;
49
50	if (ascii[0] != '0' || (ascii[1] != 'x' && ascii[1] != 'X'))
51		return (0);
52	ascii += 2;
53
54	while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
55		if (c == '.' || c == '+' || c == '/')
56			continue;
57		if (!isascii(c))
58			return (0);
59		if (islower(c))
60			c = toupper(c);
61		if (isxdigit(c)) {
62			nib = xtob(c);
63			c = *ascii++;
64			if (c != '\0') {
65				c = toupper(c);
66				if (isxdigit(c)) {
67					*binary++ = (nib << 4) | xtob(c);
68					len++;
69				} else
70					return (0);
71			}
72			else
73				return (0);
74		}
75		else
76			return (0);
77	}
78	return (len);
79}
80
81char *
82inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
83	int nib;
84	int i;
85	char *tmpbuf = inet_nsap_ntoa_tmpbuf;
86	char *start;
87
88	if (ascii)
89		start = ascii;
90	else {
91		ascii = tmpbuf;
92		start = tmpbuf;
93	}
94
95	*ascii++ = '0';
96	*ascii++ = 'x';
97
98	if (binlen > 255)
99		binlen = 255;
100
101	for (i = 0; i < binlen; i++) {
102		nib = *binary >> 4;
103		*ascii++ = nib + (nib < 10 ? '0' : '7');
104		nib = *binary++ & 0x0f;
105		*ascii++ = nib + (nib < 10 ? '0' : '7');
106		if (((i % 2) == 0 && (i + 1) < binlen))
107			*ascii++ = '.';
108	}
109	*ascii = '\0';
110	return (start);
111}
112
113/*
114 * Weak aliases for applications that use certain private entry points,
115 * and fail to include <arpa/inet.h>.
116 */
117#undef inet_nsap_addr
118__weak_reference(__inet_nsap_addr, inet_nsap_addr);
119#undef inet_nsap_ntoa
120__weak_reference(__inet_nsap_ntoa, inet_nsap_ntoa);
121
122/*! \file */
123