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authorTon Voon <tonvoon@users.sourceforge.net>2007-01-24 22:47:25 (GMT)
committerTon Voon <tonvoon@users.sourceforge.net>2007-01-24 22:47:25 (GMT)
commitfe856aa957978504137c1d425815d4ed8a22be40 (patch)
treea5bb46ce0e64b2056f75700eadbf27aba7c39418 /gl/inet_ntop.c
parent210f39bc84cfbb21cd72dc054e43f13815ee0616 (diff)
downloadmonitoring-plugins-fe856aa957978504137c1d425815d4ed8a22be40.tar.gz
Sync with gnulib - lots of extraneous code removed in preference to GNU code
git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1580 f882894a-f735-0410-b71e-b25c423dba1c
Diffstat (limited to 'gl/inet_ntop.c')
-rw-r--r--gl/inet_ntop.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/gl/inet_ntop.c b/gl/inet_ntop.c
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1/* inet_ntop.c -- convert IPv4 and IPv6 addresses from binary to text form
2
3 Copyright (C) 2005, 2006 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19/*
20 * Copyright (c) 1996-1999 by Internet Software Consortium.
21 *
22 * Permission to use, copy, modify, and distribute this software for any
23 * purpose with or without fee is hereby granted, provided that the above
24 * copyright notice and this permission notice appear in all copies.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
27 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
29 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
30 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
31 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
32 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
33 * SOFTWARE.
34 */
35
36#include <config.h>
37
38/* Specification. */
39#include "inet_ntop.h"
40
41#include <stdio.h>
42#include <string.h>
43#include <errno.h>
44
45#ifndef EAFNOSUPPORT
46# define EAFNOSUPPORT EINVAL
47#endif
48
49#define NS_IN6ADDRSZ 16
50#define NS_INT16SZ 2
51
52/*
53 * WARNING: Don't even consider trying to compile this on a system where
54 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
55 */
56typedef int verify_int_size[2 * sizeof (int) - 7];
57
58static const char *inet_ntop4 (const unsigned char *src, char *dst, socklen_t size);
59#if HAVE_IPV6
60static const char *inet_ntop6 (const unsigned char *src, char *dst, socklen_t size);
61#endif
62
63
64/* char *
65 * inet_ntop(af, src, dst, size)
66 * convert a network format address to presentation format.
67 * return:
68 * pointer to presentation format address (`dst'), or NULL (see errno).
69 * author:
70 * Paul Vixie, 1996.
71 */
72const char *
73inet_ntop (int af, const void *restrict src,
74 char *restrict dst, socklen_t cnt)
75{
76 switch (af)
77 {
78#if HAVE_IPV4
79 case AF_INET:
80 return (inet_ntop4 (src, dst, cnt));
81#endif
82
83#if HAVE_IPV6
84 case AF_INET6:
85 return (inet_ntop6 (src, dst, cnt));
86#endif
87
88 default:
89 errno = EAFNOSUPPORT;
90 return (NULL);
91 }
92 /* NOTREACHED */
93}
94
95/* const char *
96 * inet_ntop4(src, dst, size)
97 * format an IPv4 address
98 * return:
99 * `dst' (as a const)
100 * notes:
101 * (1) uses no statics
102 * (2) takes a u_char* not an in_addr as input
103 * author:
104 * Paul Vixie, 1996.
105 */
106static const char *
107inet_ntop4 (const unsigned char *src, char *dst, socklen_t size)
108{
109 char tmp[sizeof "255.255.255.255"];
110 int len;
111
112 len = sprintf (tmp, "%u.%u.%u.%u", src[0], src[1], src[2], src[3]);
113 if (len < 0)
114 return NULL;
115
116 if (len > size)
117 {
118 errno = ENOSPC;
119 return NULL;
120 }
121
122 return strcpy (dst, tmp);
123}
124
125#if HAVE_IPV6
126
127/* const char *
128 * inet_ntop6(src, dst, size)
129 * convert IPv6 binary address into presentation (printable) format
130 * author:
131 * Paul Vixie, 1996.
132 */
133static const char *
134inet_ntop6 (const unsigned char *src, char *dst, socklen_t size)
135{
136 /*
137 * Note that int32_t and int16_t need only be "at least" large enough
138 * to contain a value of the specified size. On some systems, like
139 * Crays, there is no such thing as an integer variable with 16 bits.
140 * Keep this in mind if you think this function should have been coded
141 * to use pointer overlays. All the world's not a VAX.
142 */
143 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
144 struct
145 {
146 int base, len;
147 } best, cur;
148 unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ];
149 int i;
150
151 /*
152 * Preprocess:
153 * Copy the input (bytewise) array into a wordwise array.
154 * Find the longest run of 0x00's in src[] for :: shorthanding.
155 */
156 memset (words, '\0', sizeof words);
157 for (i = 0; i < NS_IN6ADDRSZ; i += 2)
158 words[i / 2] = (src[i] << 8) | src[i + 1];
159 best.base = -1;
160 cur.base = -1;
161 for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
162 {
163 if (words[i] == 0)
164 {
165 if (cur.base == -1)
166 cur.base = i, cur.len = 1;
167 else
168 cur.len++;
169 }
170 else
171 {
172 if (cur.base != -1)
173 {
174 if (best.base == -1 || cur.len > best.len)
175 best = cur;
176 cur.base = -1;
177 }
178 }
179 }
180 if (cur.base != -1)
181 {
182 if (best.base == -1 || cur.len > best.len)
183 best = cur;
184 }
185 if (best.base != -1 && best.len < 2)
186 best.base = -1;
187
188 /*
189 * Format the result.
190 */
191 tp = tmp;
192 for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
193 {
194 /* Are we inside the best run of 0x00's? */
195 if (best.base != -1 && i >= best.base && i < (best.base + best.len))
196 {
197 if (i == best.base)
198 *tp++ = ':';
199 continue;
200 }
201 /* Are we following an initial run of 0x00s or any real hex? */
202 if (i != 0)
203 *tp++ = ':';
204 /* Is this address an encapsulated IPv4? */
205 if (i == 6 && best.base == 0 &&
206 (best.len == 6 || (best.len == 5 && words[5] == 0xffff)))
207 {
208 if (!inet_ntop4 (src + 12, tp, sizeof tmp - (tp - tmp)))
209 return (NULL);
210 tp += strlen (tp);
211 break;
212 }
213 {
214 int len = sprintf (tp, "%x", words[i]);
215 if (len < 0)
216 return NULL;
217 tp += len;
218 }
219 }
220 /* Was it a trailing run of 0x00's? */
221 if (best.base != -1 && (best.base + best.len) ==
222 (NS_IN6ADDRSZ / NS_INT16SZ))
223 *tp++ = ':';
224 *tp++ = '\0';
225
226 /*
227 * Check for overflow, copy, and we're done.
228 */
229 if ((socklen_t) (tp - tmp) > size)
230 {
231 errno = ENOSPC;
232 return NULL;
233 }
234
235 return strcpy (dst, tmp);
236}
237
238#endif