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8f694072 MP |
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 | ||
8f694072 | 18 | |
3723efcb | 19 | #include "rsync.h" |
8f694072 MP |
20 | |
21 | #define NS_INT16SZ 2 | |
22 | #define NS_IN6ADDRSZ 16 | |
23 | ||
24 | /* | |
25 | * WARNING: Don't even consider trying to compile this on a system where | |
26 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. | |
27 | */ | |
28 | ||
29 | static const char *inet_ntop4(const unsigned char *src, char *dst, | |
30 | size_t size); | |
31 | ||
32 | #ifdef AF_INET6 | |
33 | static const char *inet_ntop6(const unsigned char *src, char *dst, | |
34 | size_t size); | |
35 | #endif | |
36 | ||
37 | /* char * | |
38 | * isc_net_ntop(af, src, dst, size) | |
39 | * convert a network format address to presentation format. | |
40 | * return: | |
41 | * pointer to presentation format address (`dst'), or NULL (see errno). | |
42 | * author: | |
43 | * Paul Vixie, 1996. | |
44 | */ | |
45 | const char * | |
09b6f4b0 | 46 | inet_ntop(int af, const void *src, char *dst, size_t size) |
8f694072 MP |
47 | { |
48 | switch (af) { | |
49 | case AF_INET: | |
50 | return (inet_ntop4(src, dst, size)); | |
51 | #ifdef AF_INET6 | |
52 | case AF_INET6: | |
53 | return (inet_ntop6(src, dst, size)); | |
54 | #endif | |
55 | default: | |
56 | errno = EAFNOSUPPORT; | |
57 | return (NULL); | |
58 | } | |
59 | /* NOTREACHED */ | |
60 | } | |
61 | ||
62 | /* const char * | |
63 | * inet_ntop4(src, dst, size) | |
64 | * format an IPv4 address | |
65 | * return: | |
66 | * `dst' (as a const) | |
67 | * notes: | |
68 | * (1) uses no statics | |
69 | * (2) takes a unsigned char* not an in_addr as input | |
70 | * author: | |
71 | * Paul Vixie, 1996. | |
72 | */ | |
73 | static const char * | |
74 | inet_ntop4(const unsigned char *src, char *dst, size_t size) | |
75 | { | |
76 | static const char *fmt = "%u.%u.%u.%u"; | |
77 | char tmp[sizeof "255.255.255.255"]; | |
78 | ||
79 | if ((size_t)sprintf(tmp, fmt, src[0], src[1], src[2], src[3]) >= size) | |
80 | { | |
81 | errno = ENOSPC; | |
82 | return (NULL); | |
83 | } | |
84 | strcpy(dst, tmp); | |
85 | ||
86 | return (dst); | |
87 | } | |
88 | ||
89 | /* const char * | |
90 | * isc_inet_ntop6(src, dst, size) | |
91 | * convert IPv6 binary address into presentation (printable) format | |
92 | * author: | |
93 | * Paul Vixie, 1996. | |
94 | */ | |
95 | #ifdef AF_INET6 | |
96 | static const char * | |
97 | inet_ntop6(const unsigned char *src, char *dst, size_t size) | |
98 | { | |
99 | /* | |
100 | * Note that int32_t and int16_t need only be "at least" large enough | |
101 | * to contain a value of the specified size. On some systems, like | |
102 | * Crays, there is no such thing as an integer variable with 16 bits. | |
103 | * Keep this in mind if you think this function should have been coded | |
104 | * to use pointer overlays. All the world's not a VAX. | |
105 | */ | |
106 | char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; | |
107 | struct { int base, len; } best, cur; | |
108 | unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ]; | |
109 | int i; | |
110 | ||
111 | /* | |
112 | * Preprocess: | |
113 | * Copy the input (bytewise) array into a wordwise array. | |
114 | * Find the longest run of 0x00's in src[] for :: shorthanding. | |
115 | */ | |
116 | memset(words, '\0', sizeof words); | |
117 | for (i = 0; i < NS_IN6ADDRSZ; i++) | |
118 | words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); | |
119 | best.base = -1; | |
120 | cur.base = -1; | |
121 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { | |
122 | if (words[i] == 0) { | |
123 | if (cur.base == -1) | |
124 | cur.base = i, cur.len = 1; | |
125 | else | |
126 | cur.len++; | |
127 | } else { | |
128 | if (cur.base != -1) { | |
129 | if (best.base == -1 || cur.len > best.len) | |
130 | best = cur; | |
131 | cur.base = -1; | |
132 | } | |
133 | } | |
134 | } | |
135 | if (cur.base != -1) { | |
136 | if (best.base == -1 || cur.len > best.len) | |
137 | best = cur; | |
138 | } | |
139 | if (best.base != -1 && best.len < 2) | |
140 | best.base = -1; | |
141 | ||
142 | /* | |
143 | * Format the result. | |
144 | */ | |
145 | tp = tmp; | |
146 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { | |
147 | /* Are we inside the best run of 0x00's? */ | |
148 | if (best.base != -1 && i >= best.base && | |
149 | i < (best.base + best.len)) { | |
150 | if (i == best.base) | |
151 | *tp++ = ':'; | |
152 | continue; | |
153 | } | |
154 | /* Are we following an initial run of 0x00s or any real hex? */ | |
155 | if (i != 0) | |
156 | *tp++ = ':'; | |
157 | /* Is this address an encapsulated IPv4? */ | |
158 | if (i == 6 && best.base == 0 && | |
159 | (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { | |
160 | if (!inet_ntop4(src+12, tp, | |
161 | sizeof tmp - (tp - tmp))) | |
162 | return (NULL); | |
163 | tp += strlen(tp); | |
164 | break; | |
165 | } | |
166 | tp += sprintf(tp, "%x", words[i]); | |
167 | } | |
168 | /* Was it a trailing run of 0x00's? */ | |
169 | if (best.base != -1 && (best.base + best.len) == | |
170 | (NS_IN6ADDRSZ / NS_INT16SZ)) | |
171 | *tp++ = ':'; | |
172 | *tp++ = '\0'; | |
173 | ||
174 | /* | |
175 | * Check for overflow, copy, and we're done. | |
176 | */ | |
177 | if ((size_t)(tp - tmp) > size) { | |
178 | errno = ENOSPC; | |
179 | return (NULL); | |
180 | } | |
181 | strcpy(dst, tmp); | |
182 | return (dst); | |
183 | } | |
184 | #endif /* AF_INET6 */ |