vfs: check userland buffers before reading them.
[haiku.git] / src / kits / network / netresolv / inet / nsap_addr.c
blobcb7b6c786713387ec987e5f165dc77b696348efa
1 /* $NetBSD: nsap_addr.c,v 1.6 2009/04/12 17:07:17 christos Exp $ */
3 /*
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1996-1999 by Internet Software Consortium.
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.
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.
20 #include <sys/cdefs.h>
21 #if defined(LIBC_SCCS) && !defined(lint)
22 #if 0
23 static const char rcsid[] = "Id: nsap_addr.c,v 1.5 2005/07/28 06:51:48 marka Exp";
24 #else
25 __RCSID("$NetBSD: nsap_addr.c,v 1.6 2009/04/12 17:07:17 christos Exp $");
26 #endif
27 #endif /* LIBC_SCCS and not lint */
29 #include "port_before.h"
31 #include <sys/types.h>
32 #include <sys/param.h>
33 #include <sys/socket.h>
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
37 #include <arpa/nameser.h>
39 #include <assert.h>
40 #include <ctype.h>
41 #include <resolv.h>
42 #include <resolv_mt.h>
44 #include "port_after.h"
46 static char
47 xtob(int c) {
48 return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
51 u_int
52 inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
53 u_char c, nib;
54 u_int len = 0;
56 assert(ascii != NULL);
57 assert(binary != NULL);
59 if (ascii[0] != '0' || (ascii[1] != 'x' && ascii[1] != 'X'))
60 return (0);
61 ascii += 2;
63 while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
64 if (c == '.' || c == '+' || c == '/')
65 continue;
66 if (!isascii(c))
67 return (0);
68 if (islower(c))
69 c = toupper(c);
70 if (isxdigit(c)) {
71 nib = xtob(c);
72 c = *ascii++;
73 if (c != '\0') {
74 c = toupper(c);
75 if (isxdigit(c)) {
76 *binary++ = (nib << 4) | xtob(c);
77 len++;
78 } else
79 return (0);
81 else
82 return (0);
84 else
85 return (0);
87 return (len);
90 char *
91 inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
92 int nib;
93 int i;
94 char *tmpbuf = inet_nsap_ntoa_tmpbuf;
95 char *start;
97 assert(binary != NULL);
99 if (ascii)
100 start = ascii;
101 else {
102 ascii = tmpbuf;
103 start = tmpbuf;
106 *ascii++ = '0';
107 *ascii++ = 'x';
109 if (binlen > 255)
110 binlen = 255;
112 for (i = 0; i < binlen; i++) {
113 nib = (u_int32_t)*binary >> 4;
114 *ascii++ = nib + (nib < 10 ? '0' : '7');
115 nib = *binary++ & 0x0f;
116 *ascii++ = nib + (nib < 10 ? '0' : '7');
117 if (((i % 2) == 0 && (i + 1) < binlen))
118 *ascii++ = '.';
120 *ascii = '\0';
121 return (start);
124 #undef inet_nsap_addr
125 #pragma weak inet_nsap_addr = __inet_nsap_addr
126 #undef inet_nsap_ntoa
127 #pragma weak inet_nsap_ntoa = __inet_nsap_ntoa