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0e076fb1 | 1 | /* |
2 | * Shamelessly duplicated from the bind9 public sources | |
3 | * for use by the Squid Project under ISC written permission | |
4 | * included "as found" below. | |
5 | * | |
6 | * Update/Maintenance History: | |
7 | * | |
8 | * 24-Sep-2007 : Copied from bind 9.3.3 | |
9 | * - Added protection around libray headers | |
10 | * - Altered configure checks | |
11 | * - Un-hacked slightly to use system gethostbyname() | |
12 | * | |
13 | * 06-Oct-2007 : Various fixes to allow the build on MinGW | |
14 | * | |
15 | * 28-Oct-2007: drop some dead code. now tested working without. | |
16 | * | |
b095e27d AJ |
17 | * 04-Nov-2010: drop SPRINTF casting macro |
18 | * | |
0e076fb1 | 19 | * Original License and code follows. |
20 | */ | |
21 | ||
f7f3304a | 22 | #include "squid.h" |
0e076fb1 | 23 | |
32d002cb | 24 | #if !HAVE_INET_NTOP |
48a146e7 | 25 | #include "inet_ntop.h" |
0e076fb1 | 26 | |
27 | /* | |
28 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") | |
29 | * Copyright (c) 1996-1999 by Internet Software Consortium. | |
30 | * | |
31 | * Permission to use, copy, modify, and distribute this software for any | |
32 | * purpose with or without fee is hereby granted, provided that the above | |
33 | * copyright notice and this permission notice appear in all copies. | |
34 | * | |
35 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES | |
36 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
37 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR | |
38 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
39 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
40 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
41 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
42 | */ | |
43 | ||
44 | #if defined(LIBC_SCCS) && !defined(lint) | |
45 | static const char rcsid[] = "inet_ntop.c,v 1.1.2.1.8.2 2005/11/03 23:08:40 marka Exp"; | |
46 | #endif /* LIBC_SCCS and not lint */ | |
47 | ||
48 | #if HAVE_SYS_PARAM_H | |
49 | #include <sys/param.h> | |
50 | #endif | |
51 | #if HAVE_SYS_TYPES_H | |
52 | #include <sys/types.h> | |
53 | #endif | |
54 | #if HAVE_SYS_SOCKET_H | |
55 | #include <sys/socket.h> | |
56 | #endif | |
57 | ||
58 | #if HAVE_NETINET_IN_H | |
59 | #include <netinet/in.h> | |
60 | #endif | |
61 | #if HAVE_ARPA_INET_H | |
62 | #include <arpa/inet.h> | |
63 | #endif | |
64 | #if HAVE_ARPA_NAMESER_H | |
65 | #include <arpa/nameser.h> | |
66 | #endif | |
67 | ||
68 | #if HAVE_ERRNO_H | |
69 | #include <errno.h> | |
70 | #endif | |
0e076fb1 | 71 | #if HAVE_STRING_H |
72 | #include <string.h> | |
73 | #endif | |
74 | ||
0e076fb1 | 75 | #if ! defined(NS_INADDRSZ) |
76 | #define NS_INADDRSZ 4 | |
77 | #endif | |
78 | #if ! defined(NS_IN6ADDRSZ) | |
79 | #define NS_IN6ADDRSZ 16 | |
80 | #endif | |
81 | #if ! defined(NS_INT16SZ) | |
82 | #define NS_INT16SZ 2 | |
83 | #endif | |
84 | ||
85 | /* | |
86 | * WARNING: Don't even consider trying to compile this on a system where | |
87 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. | |
88 | */ | |
89 | ||
90 | static const char *inet_ntop4 (const u_char *src, char *dst, size_t size); | |
91 | static const char *inet_ntop6 (const u_char *src, char *dst, size_t size); | |
92 | ||
93 | /* char * | |
94 | * inet_ntop(af, src, dst, size) | |
95 | * convert a network format address to presentation format. | |
96 | * return: | |
97 | * pointer to presentation format address (`dst'), or NULL (see errno). | |
98 | * author: | |
99 | * Paul Vixie, 1996. | |
100 | */ | |
101 | const char * | |
102 | xinet_ntop(af, src, dst, size) | |
26ac0430 AJ |
103 | int af; |
104 | const void *src; | |
105 | char *dst; | |
106 | size_t size; | |
0e076fb1 | 107 | { |
26ac0430 AJ |
108 | switch (af) { |
109 | case AF_INET: | |
110 | return (inet_ntop4(src, dst, size)); | |
111 | case AF_INET6: | |
112 | return (inet_ntop6(src, dst, size)); | |
113 | default: | |
114 | errno = EAFNOSUPPORT; | |
115 | return (NULL); | |
116 | } | |
117 | /* NOTREACHED */ | |
0e076fb1 | 118 | } |
119 | ||
120 | /* const char * | |
121 | * inet_ntop4(src, dst, size) | |
122 | * format an IPv4 address | |
123 | * return: | |
124 | * `dst' (as a const) | |
125 | * notes: | |
126 | * (1) uses no statics | |
127 | * (2) takes a u_char* not an in_addr as input | |
128 | * author: | |
129 | * Paul Vixie, 1996. | |
130 | */ | |
131 | static const char * | |
132 | inet_ntop4(src, dst, size) | |
26ac0430 AJ |
133 | const u_char *src; |
134 | char *dst; | |
135 | size_t size; | |
0e076fb1 | 136 | { |
26ac0430 AJ |
137 | static const char fmt[] = "%u.%u.%u.%u"; |
138 | char tmp[sizeof "255.255.255.255"]; | |
0e076fb1 | 139 | |
b095e27d | 140 | if (snprintf(tmp, min(sizeof("255.255.255.255"),size), fmt, src[0], src[1], src[2], src[3]) >= size) { |
26ac0430 AJ |
141 | errno = ENOSPC; |
142 | return (NULL); | |
143 | } | |
144 | strcpy(dst, tmp); | |
145 | return (dst); | |
0e076fb1 | 146 | } |
147 | ||
148 | /* const char * | |
149 | * inet_ntop6(src, dst, size) | |
150 | * convert IPv6 binary address into presentation (printable) format | |
151 | * author: | |
152 | * Paul Vixie, 1996. | |
153 | */ | |
154 | static const char * | |
155 | inet_ntop6(src, dst, size) | |
26ac0430 AJ |
156 | const u_char *src; |
157 | char *dst; | |
158 | size_t size; | |
0e076fb1 | 159 | { |
26ac0430 AJ |
160 | /* |
161 | * Note that int32_t and int16_t need only be "at least" large enough | |
162 | * to contain a value of the specified size. On some systems, like | |
163 | * Crays, there is no such thing as an integer variable with 16 bits. | |
164 | * Keep this in mind if you think this function should have been coded | |
165 | * to use pointer overlays. All the world's not a VAX. | |
166 | */ | |
167 | char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; | |
168 | struct { int base, len; } best, cur; | |
169 | u_int words[NS_IN6ADDRSZ / NS_INT16SZ]; | |
170 | int i; | |
0e076fb1 | 171 | |
26ac0430 AJ |
172 | /* |
173 | * Preprocess: | |
174 | * Copy the input (bytewise) array into a wordwise array. | |
175 | * Find the longest run of 0x00's in src[] for :: shorthanding. | |
176 | */ | |
177 | memset(words, '\0', sizeof words); | |
178 | for (i = 0; i < NS_IN6ADDRSZ; i++) | |
179 | words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); | |
180 | best.base = -1; | |
181 | best.len = 0; | |
182 | cur.base = -1; | |
183 | cur.len = 0; | |
184 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { | |
185 | if (words[i] == 0) { | |
186 | if (cur.base == -1) | |
187 | cur.base = i, cur.len = 1; | |
188 | else | |
189 | cur.len++; | |
190 | } else { | |
191 | if (cur.base != -1) { | |
192 | if (best.base == -1 || cur.len > best.len) | |
193 | best = cur; | |
194 | cur.base = -1; | |
195 | } | |
196 | } | |
197 | } | |
198 | if (cur.base != -1) { | |
199 | if (best.base == -1 || cur.len > best.len) | |
200 | best = cur; | |
201 | } | |
202 | if (best.base != -1 && best.len < 2) | |
203 | best.base = -1; | |
0e076fb1 | 204 | |
26ac0430 AJ |
205 | /* |
206 | * Format the result. | |
207 | */ | |
208 | tp = tmp; | |
209 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { | |
210 | /* Are we inside the best run of 0x00's? */ | |
211 | if (best.base != -1 && i >= best.base && | |
212 | i < (best.base + best.len)) { | |
213 | if (i == best.base) | |
214 | *tp++ = ':'; | |
215 | continue; | |
216 | } | |
217 | /* Are we following an initial run of 0x00s or any real hex? */ | |
218 | if (i != 0) | |
219 | *tp++ = ':'; | |
220 | /* Is this address an encapsulated IPv4? */ | |
221 | if (i == 6 && best.base == 0 && (best.len == 6 || | |
222 | (best.len == 7 && words[7] != 0x0001) || | |
223 | (best.len == 5 && words[5] == 0xffff))) { | |
224 | if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) | |
225 | return (NULL); | |
226 | tp += strlen(tp); | |
227 | break; | |
228 | } | |
b095e27d | 229 | tp += snprintf(tp, (tmp + sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") - tp), "%x", words[i]); |
26ac0430 AJ |
230 | } |
231 | /* Was it a trailing run of 0x00's? */ | |
232 | if (best.base != -1 && (best.base + best.len) == | |
233 | (NS_IN6ADDRSZ / NS_INT16SZ)) | |
234 | *tp++ = ':'; | |
235 | *tp++ = '\0'; | |
0e076fb1 | 236 | |
26ac0430 AJ |
237 | /* |
238 | * Check for overflow, copy, and we're done. | |
239 | */ | |
240 | if ((size_t)(tp - tmp) > size) { | |
241 | errno = ENOSPC; | |
242 | return (NULL); | |
243 | } | |
244 | strcpy(dst, tmp); | |
245 | return (dst); | |
0e076fb1 | 246 | } |
247 | ||
248 | #endif /* HAVE_INET_NTOP */ |