xref: /titanic_44/usr/src/lib/libresolv2/common/inet/nsap_addr.c (revision a60349c89adffc0902b2353230891d8e7f2b24d9)
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)
19 static 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 
22 #include "port_before.h"
23 
24 #include <sys/types.h>
25 #include <sys/param.h>
26 #include <sys/socket.h>
27 
28 #include <netinet/in.h>
29 #include <arpa/inet.h>
30 #include <arpa/nameser.h>
31 
32 #include <ctype.h>
33 #include <resolv.h>
34 #include <resolv_mt.h>
35 
36 #include "port_after.h"
37 
38 static char
39 xtob(int c) {
40 	return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
41 }
42 
43 u_int
44 inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
45 	u_char c, nib;
46 	u_int len = 0;
47 
48 	if (ascii[0] != '0' || (ascii[1] != 'x' && ascii[1] != 'X'))
49 		return (0);
50 	ascii += 2;
51 
52 	while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
53 		if (c == '.' || c == '+' || c == '/')
54 			continue;
55 		if (!isascii(c))
56 			return (0);
57 		if (islower(c))
58 			c = toupper(c);
59 		if (isxdigit(c)) {
60 			nib = xtob(c);
61 			c = *ascii++;
62 			if (c != '\0') {
63 				c = toupper(c);
64 				if (isxdigit(c)) {
65 					*binary++ = (nib << 4) | xtob(c);
66 					len++;
67 				} else
68 					return (0);
69 			}
70 			else
71 				return (0);
72 		}
73 		else
74 			return (0);
75 	}
76 	return (len);
77 }
78 
79 char *
80 inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
81 	int nib;
82 	int i;
83 	char *tmpbuf = inet_nsap_ntoa_tmpbuf;
84 	char *start;
85 
86 	if (ascii)
87 		start = ascii;
88 	else {
89 		ascii = tmpbuf;
90 		start = tmpbuf;
91 	}
92 
93 	*ascii++ = '0';
94 	*ascii++ = 'x';
95 
96 	if (binlen > 255)
97 		binlen = 255;
98 
99 	for (i = 0; i < binlen; i++) {
100 		nib = *binary >> 4;
101 		*ascii++ = nib + (nib < 10 ? '0' : '7');
102 		nib = *binary++ & 0x0f;
103 		*ascii++ = nib + (nib < 10 ? '0' : '7');
104 		if (((i % 2) == 0 && (i + 1) < binlen))
105 			*ascii++ = '.';
106 	}
107 	*ascii = '\0';
108 	return (start);
109 }
110 
111 /*! \file */
112