source: squid-ssl/trunk/fuentes/compat/inet_ntop.cc @ 5495

Last change on this file since 5495 was 5495, checked in by Juanma, 2 years ago

Initial release

File size: 7.1 KB
Line 
1/*
2 * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
3 *
4 * Squid software is distributed under GPLv2+ license and includes
5 * contributions from numerous individuals and organizations.
6 * Please see the COPYING and CONTRIBUTORS files for details.
7 */
8
9/*
10 *  Shamelessly duplicated from the bind9 public sources
11 *  for use by the Squid Project under ISC written permission
12 *  included "as found" below.
13 *
14 * Update/Maintenance History:
15 *
16 *    24-Sep-2007 : Copied from bind 9.3.3
17 *          - Added protection around libray headers
18 *          - Altered configure checks
19 *          - Un-hacked slightly to use system gethostbyname()
20 *
21 *    06-Oct-2007 : Various fixes to allow the build on MinGW
22 *
23 *    28-Oct-2007: drop some dead code. now tested working without.
24 *
25 *    04-Nov-2010: drop SPRINTF casting macro
26 *
27 *    13-Jan-2015 : Various fixed for C++ and MinGW native build
28 *
29 *  Original License and code follows.
30 */
31
32#include "squid.h"
33
34#if !HAVE_DECL_INET_NTOP
35
36/*
37 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
38 * Copyright (c) 1996-1999 by Internet Software Consortium.
39 *
40 * Permission to use, copy, modify, and distribute this software for any
41 * purpose with or without fee is hereby granted, provided that the above
42 * copyright notice and this permission notice appear in all copies.
43 *
44 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
45 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
46 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
47 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
48 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
49 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
50 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
51 */
52
53#if defined(LIBC_SCCS) && !defined(lint)
54static const char rcsid[] = "inet_ntop.c,v 1.1.2.1.8.2 2005/11/03 23:08:40 marka Exp";
55#endif /* LIBC_SCCS and not lint */
56
57#if HAVE_SYS_PARAM_H
58#include <sys/param.h>
59#endif
60#if HAVE_SYS_TYPES_H
61#include <sys/types.h>
62#endif
63#if HAVE_SYS_SOCKET_H
64#include <sys/socket.h>
65#endif
66
67#if HAVE_NETINET_IN_H
68#include <netinet/in.h>
69#endif
70#if HAVE_ARPA_INET_H
71#include <arpa/inet.h>
72#endif
73#if HAVE_ARPA_NAMESER_H
74#include <arpa/nameser.h>
75#endif
76
77#if HAVE_ERRNO_H
78#include <errno.h>
79#endif
80#if HAVE_STRING_H
81#include <string.h>
82#endif
83
84#if ! defined(NS_INADDRSZ)
85#define NS_INADDRSZ      4
86#endif
87#if ! defined(NS_IN6ADDRSZ)
88#define NS_IN6ADDRSZ    16
89#endif
90#if ! defined(NS_INT16SZ)
91#define NS_INT16SZ      2
92#endif
93
94/*
95 * WARNING: Don't even consider trying to compile this on a system where
96 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
97 */
98
99static const char *inet_ntop4 (const u_char *src, char *dst, size_t size);
100static const char *inet_ntop6 (const u_char *src, char *dst, size_t size);
101
102/* char *
103 * inet_ntop(af, src, dst, size)
104 *  convert a network format address to presentation format.
105 * return:
106 *  pointer to presentation format address (`dst'), or NULL (see errno).
107 * author:
108 *  Paul Vixie, 1996.
109 */
110const char *
111xinet_ntop(int af, const void *src, char *dst, size_t size)
112{
113    switch (af) {
114    case AF_INET:
115        return (inet_ntop4((const u_char*)src, dst, size));
116    case AF_INET6:
117        return (inet_ntop6((const u_char*)src, dst, size));
118    default:
119        errno = EAFNOSUPPORT;
120        return (NULL);
121    }
122    /* NOTREACHED */
123}
124
125/* const char *
126 * inet_ntop4(src, dst, size)
127 *  format an IPv4 address
128 * return:
129 *  `dst' (as a const)
130 * notes:
131 *  (1) uses no statics
132 *  (2) takes a u_char* not an in_addr as input
133 * author:
134 *  Paul Vixie, 1996.
135 */
136static const char *
137inet_ntop4(const u_char *src, char *dst, size_t size)
138{
139    static const char fmt[] = "%u.%u.%u.%u";
140    char tmp[sizeof("255.255.255.255")+1];
141
142    if ((size_t)snprintf(tmp, min(sizeof(tmp),size), fmt, src[0], src[1], src[2], src[3]) >= size) {
143        errno = ENOSPC;
144        return (NULL);
145    }
146    strcpy(dst, tmp);
147    return (dst);
148}
149
150/* const char *
151 * inet_ntop6(src, dst, size)
152 *  convert IPv6 binary address into presentation (printable) format
153 * author:
154 *  Paul Vixie, 1996.
155 */
156static const char *
157inet_ntop6(const u_char *src, char *dst, size_t size)
158{
159    /*
160     * Note that int32_t and int16_t need only be "at least" large enough
161     * to contain a value of the specified size.  On some systems, like
162     * Crays, there is no such thing as an integer variable with 16 bits.
163     * Keep this in mind if you think this function should have been coded
164     * to use pointer overlays.  All the world's not a VAX.
165     */
166    char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
167    struct { int base, len; } best, cur;
168    u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
169    int i;
170
171    /*
172     * Preprocess:
173     *  Copy the input (bytewise) array into a wordwise array.
174     *  Find the longest run of 0x00's in src[] for :: shorthanding.
175     */
176    memset(words, '\0', sizeof words);
177    for (i = 0; i < NS_IN6ADDRSZ; i++)
178        words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
179    best.base = -1;
180    best.len = 0;
181    cur.base = -1;
182    cur.len = 0;
183    for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
184        if (words[i] == 0) {
185            if (cur.base == -1)
186                cur.base = i, cur.len = 1;
187            else
188                cur.len++;
189        } else {
190            if (cur.base != -1) {
191                if (best.base == -1 || cur.len > best.len)
192                    best = cur;
193                cur.base = -1;
194            }
195        }
196    }
197    if (cur.base != -1) {
198        if (best.base == -1 || cur.len > best.len)
199            best = cur;
200    }
201    if (best.base != -1 && best.len < 2)
202        best.base = -1;
203
204    /*
205     * Format the result.
206     */
207    tp = tmp;
208    for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
209        /* Are we inside the best run of 0x00's? */
210        if (best.base != -1 && i >= best.base &&
211                i < (best.base + best.len)) {
212            if (i == best.base)
213                *tp++ = ':';
214            continue;
215        }
216        /* Are we following an initial run of 0x00s or any real hex? */
217        if (i != 0)
218            *tp++ = ':';
219        /* Is this address an encapsulated IPv4? */
220        if (i == 6 && best.base == 0 && (best.len == 6 ||
221                                         (best.len == 7 && words[7] != 0x0001) ||
222                                         (best.len == 5 && words[5] == 0xffff))) {
223            if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
224                return (NULL);
225            tp += strlen(tp);
226            break;
227        }
228        tp += snprintf(tp, (tmp + sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") - tp), "%x", words[i]);
229    }
230    /* Was it a trailing run of 0x00's? */
231    if (best.base != -1 && (best.base + best.len) ==
232            (NS_IN6ADDRSZ / NS_INT16SZ))
233        *tp++ = ':';
234    *tp++ = '\0';
235
236    /*
237     * Check for overflow, copy, and we're done.
238     */
239    if ((size_t)(tp - tmp) > size) {
240        errno = ENOSPC;
241        return (NULL);
242    }
243    strcpy(dst, tmp);
244    return (dst);
245}
246
247#endif /* HAVE_DECL_INET_NTOP */
248
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