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1 | /* |
2 | * Copyright (c) 1996-1999 by 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 DISCLAIMS | |
9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES | |
10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE | |
11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
15 | * SOFTWARE. | |
16 | */ | |
17 | ||
18 | #include <errno.h> | |
19 | #include <sys/types.h> | |
20 | #include <sys/socket.h> | |
21 | #include <sys/socket.h> | |
22 | #include <netinet/in.h> | |
23 | #include <arpa/inet.h> | |
24 | #include <stdio.h> | |
25 | #include <string.h> | |
26 | ||
27 | #ifndef NS_INADDRSZ | |
28 | #define NS_INADDRSZ 4 | |
29 | #endif | |
30 | #ifndef NS_IN6ADDRSZ | |
31 | #define NS_IN6ADDRSZ 16 | |
32 | #endif | |
33 | #ifndef NS_INT16SZ | |
34 | #define NS_INT16SZ 2 | |
35 | #endif | |
36 | ||
37 | /* | |
38 | * WARNING: Don't even consider trying to compile this on a system where | |
39 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. | |
40 | */ | |
41 | ||
42 | /* const char * | |
43 | * inet_ntop4(src, dst, size) | |
44 | * format an IPv4 address | |
45 | * return: | |
46 | * `dst' (as a const) | |
47 | * notes: | |
48 | * (1) uses no statics | |
49 | * (2) takes a u_char* not an in_addr as input | |
50 | * author: | |
51 | * Paul Vixie, 1996. | |
52 | */ | |
53 | static const char * | |
54 | inet_ntop4(src, dst, size) | |
55 | const u_char *src; | |
56 | char *dst; | |
57 | size_t size; | |
58 | { | |
59 | static const char fmt[] = "%u.%u.%u.%u"; | |
60 | char tmp[sizeof "255.255.255.255"]; | |
61 | int nprinted; | |
62 | ||
63 | nprinted = snprintf(tmp, sizeof(tmp), fmt, src[0], src[1], src[2], src[3]); | |
64 | if (nprinted < 0) | |
65 | return (NULL); /* we assume "errno" was set by "snprintf()" */ | |
66 | if ((size_t)nprinted > size) { | |
67 | errno = ENOSPC; | |
68 | return (NULL); | |
69 | } | |
70 | strcpy(dst, tmp); | |
71 | return (dst); | |
72 | } | |
73 | ||
74 | #ifndef NO_IPV6 | |
75 | /* const char * | |
76 | * inet_ntop6(src, dst, size) | |
77 | * convert IPv6 binary address into presentation (printable) format | |
78 | * author: | |
79 | * Paul Vixie, 1996. | |
80 | */ | |
81 | static const char * | |
82 | inet_ntop6(src, dst, size) | |
83 | const u_char *src; | |
84 | char *dst; | |
85 | size_t size; | |
86 | { | |
87 | /* | |
88 | * Note that int32_t and int16_t need only be "at least" large enough | |
89 | * to contain a value of the specified size. On some systems, like | |
90 | * Crays, there is no such thing as an integer variable with 16 bits. | |
91 | * Keep this in mind if you think this function should have been coded | |
92 | * to use pointer overlays. All the world's not a VAX. | |
93 | */ | |
94 | char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; | |
95 | struct { int base, len; } best, cur; | |
96 | u_int words[NS_IN6ADDRSZ / NS_INT16SZ]; | |
97 | int i; | |
98 | ||
99 | /* | |
100 | * Preprocess: | |
101 | * Copy the input (bytewise) array into a wordwise array. | |
102 | * Find the longest run of 0x00's in src[] for :: shorthanding. | |
103 | */ | |
104 | memset(words, '\0', sizeof words); | |
105 | for (i = 0; i < NS_IN6ADDRSZ; i++) | |
106 | words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); | |
107 | best.base = -1; | |
108 | cur.base = -1; | |
109 | for (i = 0; i < (NS_IN6ADDRSZ / NS_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 | } else { | |
116 | if (cur.base != -1) { | |
117 | if (best.base == -1 || cur.len > best.len) | |
118 | best = cur; | |
119 | cur.base = -1; | |
120 | } | |
121 | } | |
122 | } | |
123 | if (cur.base != -1) { | |
124 | if (best.base == -1 || cur.len > best.len) | |
125 | best = cur; | |
126 | } | |
127 | if (best.base != -1 && best.len < 2) | |
128 | best.base = -1; | |
129 | ||
130 | /* | |
131 | * Format the result. | |
132 | */ | |
133 | tp = tmp; | |
134 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { | |
135 | /* Are we inside the best run of 0x00's? */ | |
136 | if (best.base != -1 && i >= best.base && | |
137 | i < (best.base + best.len)) { | |
138 | if (i == best.base) | |
139 | *tp++ = ':'; | |
140 | continue; | |
141 | } | |
142 | /* Are we following an initial run of 0x00s or any real hex? */ | |
143 | if (i != 0) | |
144 | *tp++ = ':'; | |
145 | /* Is this address an encapsulated IPv4? */ | |
146 | if (i == 6 && best.base == 0 && | |
147 | (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { | |
148 | if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) | |
149 | return (NULL); | |
150 | tp += strlen(tp); | |
151 | break; | |
152 | } | |
153 | tp += snprintf(tp, sizeof tmp - (tp - tmp), "%x", words[i]); | |
154 | } | |
155 | /* Was it a trailing run of 0x00's? */ | |
156 | if (best.base != -1 && (best.base + best.len) == | |
157 | (NS_IN6ADDRSZ / NS_INT16SZ)) | |
158 | *tp++ = ':'; | |
159 | *tp++ = '\0'; | |
160 | ||
161 | /* | |
162 | * Check for overflow, copy, and we're done. | |
163 | */ | |
164 | if ((size_t)(tp - tmp) > size) { | |
165 | errno = ENOSPC; | |
166 | return (NULL); | |
167 | } | |
168 | strcpy(dst, tmp); | |
169 | return (dst); | |
170 | } | |
171 | #endif | |
172 | ||
173 | /* char * | |
174 | * inet_ntop(af, src, dst, size) | |
175 | * convert a network format address to presentation format. | |
176 | * return: | |
177 | * pointer to presentation format address (`dst'), or NULL (see errno). | |
178 | * author: | |
179 | * Paul Vixie, 1996. | |
180 | */ | |
181 | const char * | |
182 | inet_ntop(af, src, dst, size) | |
183 | int af; | |
184 | const void *src; | |
185 | char *dst; | |
186 | size_t size; | |
187 | { | |
188 | switch (af) { | |
189 | case AF_INET: | |
190 | return (inet_ntop4(src, dst, size)); | |
191 | #ifndef NO_IPV6 | |
192 | case AF_INET6: | |
193 | return (inet_ntop6(src, dst, size)); | |
194 | #endif | |
195 | default: | |
196 | errno = EAFNOSUPPORT; | |
197 | return (NULL); | |
198 | } | |
199 | /* NOTREACHED */ | |
200 | } |