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comparison dcclib/inet_ntop.c @ 0:c7f6b056b673

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First import of vendor version
author Peter Gervai <grin@grin.hu>
date Tue, 10 Mar 2009 13:49:58 +0100
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-1:000000000000 0:c7f6b056b673
1 /* compatibility hack for systems without any IPv6 support */
2
3 /*
4 * Copyright (c) 1996-1999 by Internet Software Consortium.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
11 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
12 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
13 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
14 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
15 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
16 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
17 * SOFTWARE.
18 */
19
20 /* Rhyolite Software DCC 1.3.103-1.6 $Revision$ */
21
22
23 #include "dcc_defs.h"
24
25 #include <sys/types.h>
26
27 #ifndef DCC_WIN32
28 #include <netinet/in.h>
29 #endif
30 #ifdef HAVE_ARPA_NAMESER_H
31 #include <arpa/nameser.h>
32 #endif
33
34
35 #ifndef NS_IN6ADDRSZ
36 #define NS_IN6ADDRSZ 16
37 #endif
38 #ifndef NS_INT16SZ
39 #define NS_INT16SZ 2
40 #endif
41
42 #ifdef SPRINTF_CHAR
43 # define SPRINTF(x) strlen(sprintf/**/x)
44 #else
45 # define SPRINTF(x) ((size_t)sprintf x)
46 #endif
47
48 /*
49 * WARNING: Don't even consider trying to compile this on a system where
50 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
51 */
52
53 static const char *inet_ntop4(const u_char *src, char *dst, size_t size);
54 static const char *inet_ntop6(const u_char *src, char *dst, size_t size);
55
56 /* char *
57 * inet_ntop(af, src, dst, size)
58 * convert a network format address to presentation format.
59 * return:
60 * pointer to presentation format address (`dst'), or NULL (see errno).
61 * author:
62 * Paul Vixie, 1996.
63 */
64 const char *
65 dcc_inet_ntop(int af, const void *src, char *dst, size_t size)
66 {
67 switch (af) {
68 case AF_INET:
69 return (inet_ntop4(src, dst, size));
70 case AF_INET6:
71 return (inet_ntop6(src, dst, size));
72 default:
73 #ifdef DCC_WIN32
74 WSASetLastError(WSAEPROTONOSUPPORT);
75 #else
76 errno = EAFNOSUPPORT;
77 #endif
78 return (NULL);
79 }
80 /* NOTREACHED */
81 }
82
83 /* const char *
84 * inet_ntop4(src, dst, size)
85 * format an IPv4 address
86 * return:
87 * `dst' (as a const)
88 * notes:
89 * (1) uses no statics
90 * (2) takes a u_char* not an in_addr as input
91 * author:
92 * Paul Vixie, 1996.
93 */
94 static const char *
95 inet_ntop4(src, dst, size)
96 const u_char *src;
97 char *dst;
98 size_t size;
99 {
100 static const char fmt[] = "%u.%u.%u.%u";
101 char tmp[sizeof "255.255.255.255"];
102
103 if (SPRINTF((tmp, fmt, src[0], src[1], src[2], src[3])) >= size) {
104 #ifdef DCC_WIN32
105 WSASetLastError(ENOSPC);
106 #else
107 errno = ENOSPC;
108 #endif
109 return (NULL);
110 }
111 strcpy(dst, tmp);
112 return (dst);
113 }
114
115 /* const char *
116 * inet_ntop6(src, dst, size)
117 * convert IPv6 binary address into presentation (printable) format
118 * author:
119 * Paul Vixie, 1996.
120 */
121 static const char *
122 inet_ntop6(src, dst, size)
123 const u_char *src;
124 char *dst;
125 size_t size;
126 {
127 /*
128 * Note that int32_t and int16_t need only be "at least" large enough
129 * to contain a value of the specified size. On some systems, like
130 * Crays, there is no such thing as an integer variable with 16 bits.
131 * Keep this in mind if you think this function should have been coded
132 * to use pointer overlays. All the world's not a VAX.
133 */
134 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
135 struct { int base, len; } best, cur;
136 u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
137 int i;
138
139 /*
140 * Preprocess:
141 * Copy the input (bytewise) array into a wordwise array.
142 * Find the longest run of 0x00's in src[] for :: shorthanding.
143 */
144 memset(words, '\0', sizeof words);
145 for (i = 0; i < NS_IN6ADDRSZ; i++)
146 words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
147 best.base = -1;
148 best.len = 0;
149 cur.base = -1;
150 cur.len = 0;
151 for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
152 if (words[i] == 0) {
153 if (cur.base == -1)
154 cur.base = i, cur.len = 1;
155 else
156 cur.len++;
157 } else {
158 if (cur.base != -1) {
159 if (best.base == -1 || cur.len > best.len)
160 best = cur;
161 cur.base = -1;
162 }
163 }
164 }
165 if (cur.base != -1) {
166 if (best.base == -1 || cur.len > best.len)
167 best = cur;
168 }
169 if (best.base != -1 && best.len < 2)
170 best.base = -1;
171
172 /*
173 * Format the result.
174 */
175 tp = tmp;
176 for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
177 /* Are we inside the best run of 0x00's? */
178 if (best.base != -1 && i >= best.base &&
179 i < (best.base + best.len)) {
180 if (i == best.base)
181 *tp++ = ':';
182 continue;
183 }
184 /* Are we following an initial run of 0x00s or any real hex? */
185 if (i != 0)
186 *tp++ = ':';
187 /* Is this address an encapsulated IPv4? */
188 if (i == 6 && best.base == 0 &&
189 (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
190 if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
191 return (NULL);
192 tp += strlen(tp);
193 break;
194 }
195 tp += SPRINTF((tp, "%x", words[i]));
196 }
197 /* Was it a trailing run of 0x00's? */
198 if (best.base != -1 && (best.base + best.len) ==
199 (NS_IN6ADDRSZ / NS_INT16SZ))
200 *tp++ = ':';
201 *tp++ = '\0';
202
203 /*
204 * Check for overflow, copy, and we're done.
205 */
206 if ((size_t)(tp - tmp) > size) {
207 #ifdef DCC_WIN32
208 WSASetLastError(ENOSPC);
209 #else
210 errno = ENOSPC;
211 #endif
212 return (NULL);
213 }
214 strcpy(dst, tmp);
215 return (dst);
216 }