source: UsbWattMeter/trunk/curl-7.47.1/lib/inet_ntop.c

Last change on this file was 167, checked in by coas-nagasima, 6 years ago

MIMEにSJISを設定

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
  • Property svn:mime-type set to text/x-csrc; charset=SHIFT_JIS
File size: 5.3 KB
RevLine 
[164]1/*
2 * Copyright (C) 1996-2001 Internet Software Consortium.
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
9 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
10 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
11 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
13 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
14 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
15 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17/*
18 * Original code by Paul Vixie. "curlified" by Gisle Vanem.
19 */
20
21#include "curl_setup.h"
22
23#ifndef HAVE_INET_NTOP
24
25#ifdef HAVE_SYS_PARAM_H
26#include <sys/param.h>
27#endif
28#ifdef HAVE_NETINET_IN_H
29#include <netinet/in.h>
30#endif
31#ifdef HAVE_ARPA_INET_H
32#include <arpa/inet.h>
33#endif
34
35#include "curl_printf.h"
36
37#include "inet_ntop.h"
38
39#define IN6ADDRSZ 16
40#define INADDRSZ 4
41#define INT16SZ 2
42
43/*
44 * Format an IPv4 address, more or less like inet_ntoa().
45 *
46 * Returns `dst' (as a const)
47 * Note:
48 * - uses no statics
49 * - takes a unsigned char* not an in_addr as input
50 */
51static char *inet_ntop4 (const unsigned char *src, char *dst, size_t size)
52{
53 char tmp[sizeof "255.255.255.255"];
54 size_t len;
55
56 DEBUGASSERT(size >= 16);
57
58 tmp[0] = '\0';
59 (void)snprintf(tmp, sizeof(tmp), "%d.%d.%d.%d",
60 ((int)((unsigned char)src[0])) & 0xff,
61 ((int)((unsigned char)src[1])) & 0xff,
62 ((int)((unsigned char)src[2])) & 0xff,
63 ((int)((unsigned char)src[3])) & 0xff);
64
65 len = strlen(tmp);
66 if(len == 0 || len >= size) {
67 SET_ERRNO(ENOSPC);
68 return (NULL);
69 }
70 strcpy(dst, tmp);
71 return dst;
72}
73
74#ifdef ENABLE_IPV6
75/*
76 * Convert IPv6 binary address into presentation (printable) format.
77 */
78static char *inet_ntop6 (const unsigned char *src, char *dst, size_t size)
79{
80 /*
81 * Note that int32_t and int16_t need only be "at least" large enough
82 * to contain a value of the specified size. On some systems, like
83 * Crays, there is no such thing as an integer variable with 16 bits.
84 * Keep this in mind if you think this function should have been coded
85 * to use pointer overlays. All the world's not a VAX.
86 */
87 char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
88 char *tp;
89 struct {
90 long base;
91 long len;
92 } best, cur;
93 unsigned long words[IN6ADDRSZ / INT16SZ];
94 int i;
95
96 /* Preprocess:
97 * Copy the input (bytewise) array into a wordwise array.
98 * Find the longest run of 0x00's in src[] for :: shorthanding.
99 */
100 memset(words, '\0', sizeof(words));
101 for(i = 0; i < IN6ADDRSZ; i++)
102 words[i/2] |= (src[i] << ((1 - (i % 2)) << 3));
103
104 best.base = -1;
105 cur.base = -1;
106 best.len = 0;
107 cur.len = 0;
108
109 for(i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
110 if(words[i] == 0) {
111 if(cur.base == -1)
112 cur.base = i, cur.len = 1;
113 else
114 cur.len++;
115 }
116 else if(cur.base != -1) {
117 if(best.base == -1 || cur.len > best.len)
118 best = cur;
119 cur.base = -1;
120 }
121 }
122 if((cur.base != -1) && (best.base == -1 || cur.len > best.len))
123 best = cur;
124 if(best.base != -1 && best.len < 2)
125 best.base = -1;
126 /* Format the result. */
127 tp = tmp;
128 for(i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
129 /* Are we inside the best run of 0x00's? */
130 if(best.base != -1 && i >= best.base && i < (best.base + best.len)) {
131 if(i == best.base)
132 *tp++ = ':';
133 continue;
134 }
135
136 /* Are we following an initial run of 0x00s or any real hex?
137 */
138 if(i != 0)
139 *tp++ = ':';
140
141 /* Is this address an encapsulated IPv4?
142 */
143 if(i == 6 && best.base == 0 &&
144 (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
145 if(!inet_ntop4(src+12, tp, sizeof(tmp) - (tp - tmp))) {
146 SET_ERRNO(ENOSPC);
147 return (NULL);
148 }
149 tp += strlen(tp);
150 break;
151 }
152 tp += snprintf(tp, 5, "%lx", words[i]);
153 }
154
155 /* Was it a trailing run of 0x00's?
156 */
157 if(best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
158 *tp++ = ':';
159 *tp++ = '\0';
160
161 /* Check for overflow, copy, and we're done.
162 */
163 if((size_t)(tp - tmp) > size) {
164 SET_ERRNO(ENOSPC);
165 return (NULL);
166 }
167 strcpy(dst, tmp);
168 return dst;
169}
170#endif /* ENABLE_IPV6 */
171
172/*
173 * Convert a network format address to presentation format.
174 *
175 * Returns pointer to presentation format address (`buf').
176 * Returns NULL on error and errno set with the specific
177 * error, EAFNOSUPPORT or ENOSPC.
178 *
179 * On Windows we store the error in the thread errno, not
180 * in the winsock error code. This is to avoid losing the
181 * actual last winsock error. So use macro ERRNO to fetch the
182 * errno this function sets when returning NULL, not SOCKERRNO.
183 */
184char *Curl_inet_ntop(int af, const void *src, char *buf, size_t size)
185{
186 switch (af) {
187 case AF_INET:
188 return inet_ntop4((const unsigned char*)src, buf, size);
189#ifdef ENABLE_IPV6
190 case AF_INET6:
191 return inet_ntop6((const unsigned char*)src, buf, size);
192#endif
193 default:
194 SET_ERRNO(EAFNOSUPPORT);
195 return NULL;
196 }
197}
198#endif /* HAVE_INET_NTOP */
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