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6ba68ab2 YL |
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> | |
da523cc5 MP |
20 | |
21 | #include "../git-compat-util.h" | |
22 | ||
6ba68ab2 YL |
23 | #include <stdio.h> |
24 | #include <string.h> | |
25 | ||
26 | #ifndef NS_INADDRSZ | |
27 | #define NS_INADDRSZ 4 | |
28 | #endif | |
29 | #ifndef NS_IN6ADDRSZ | |
30 | #define NS_IN6ADDRSZ 16 | |
31 | #endif | |
32 | #ifndef NS_INT16SZ | |
33 | #define NS_INT16SZ 2 | |
34 | #endif | |
35 | ||
36 | /* | |
37 | * WARNING: Don't even consider trying to compile this on a system where | |
38 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. | |
39 | */ | |
40 | ||
41 | /* const char * | |
42 | * inet_ntop4(src, dst, size) | |
43 | * format an IPv4 address | |
44 | * return: | |
45 | * `dst' (as a const) | |
46 | * notes: | |
47 | * (1) uses no statics | |
48 | * (2) takes a u_char* not an in_addr as input | |
49 | * author: | |
50 | * Paul Vixie, 1996. | |
51 | */ | |
52 | static const char * | |
bb34c5aa | 53 | inet_ntop4(const u_char *src, char *dst, size_t size) |
6ba68ab2 YL |
54 | { |
55 | static const char fmt[] = "%u.%u.%u.%u"; | |
56 | char tmp[sizeof "255.255.255.255"]; | |
57 | int nprinted; | |
58 | ||
59 | nprinted = snprintf(tmp, sizeof(tmp), fmt, src[0], src[1], src[2], src[3]); | |
60 | if (nprinted < 0) | |
61 | return (NULL); /* we assume "errno" was set by "snprintf()" */ | |
62 | if ((size_t)nprinted > size) { | |
63 | errno = ENOSPC; | |
64 | return (NULL); | |
65 | } | |
66 | strcpy(dst, tmp); | |
67 | return (dst); | |
68 | } | |
69 | ||
70 | #ifndef NO_IPV6 | |
71 | /* const char * | |
72 | * inet_ntop6(src, dst, size) | |
73 | * convert IPv6 binary address into presentation (printable) format | |
74 | * author: | |
75 | * Paul Vixie, 1996. | |
76 | */ | |
77 | static const char * | |
bb34c5aa | 78 | inet_ntop6(const u_char *src, char *dst, size_t size) |
6ba68ab2 YL |
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"], *tp; | |
88 | struct { int base, len; } best, cur; | |
1d182bd5 | 89 | unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ]; |
6ba68ab2 YL |
90 | int i; |
91 | ||
92 | /* | |
93 | * Preprocess: | |
94 | * Copy the input (bytewise) array into a wordwise array. | |
95 | * Find the longest run of 0x00's in src[] for :: shorthanding. | |
96 | */ | |
97 | memset(words, '\0', sizeof words); | |
98 | for (i = 0; i < NS_IN6ADDRSZ; i++) | |
99 | words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); | |
100 | best.base = -1; | |
185528a8 | 101 | best.len = 0; |
6ba68ab2 | 102 | cur.base = -1; |
185528a8 | 103 | cur.len = 0; |
6ba68ab2 YL |
104 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { |
105 | if (words[i] == 0) { | |
106 | if (cur.base == -1) | |
107 | cur.base = i, cur.len = 1; | |
108 | else | |
109 | cur.len++; | |
110 | } else { | |
111 | if (cur.base != -1) { | |
112 | if (best.base == -1 || cur.len > best.len) | |
113 | best = cur; | |
114 | cur.base = -1; | |
115 | } | |
116 | } | |
117 | } | |
118 | if (cur.base != -1) { | |
119 | if (best.base == -1 || cur.len > best.len) | |
120 | best = cur; | |
121 | } | |
122 | if (best.base != -1 && best.len < 2) | |
123 | best.base = -1; | |
124 | ||
125 | /* | |
126 | * Format the result. | |
127 | */ | |
128 | tp = tmp; | |
129 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { | |
130 | /* Are we inside the best run of 0x00's? */ | |
131 | if (best.base != -1 && i >= best.base && | |
132 | i < (best.base + best.len)) { | |
133 | if (i == best.base) | |
134 | *tp++ = ':'; | |
135 | continue; | |
136 | } | |
137 | /* Are we following an initial run of 0x00s or any real hex? */ | |
138 | if (i != 0) | |
139 | *tp++ = ':'; | |
140 | /* Is this address an encapsulated IPv4? */ | |
141 | if (i == 6 && best.base == 0 && | |
142 | (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { | |
143 | if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) | |
144 | return (NULL); | |
145 | tp += strlen(tp); | |
146 | break; | |
147 | } | |
148 | tp += snprintf(tp, sizeof tmp - (tp - tmp), "%x", words[i]); | |
149 | } | |
150 | /* Was it a trailing run of 0x00's? */ | |
151 | if (best.base != -1 && (best.base + best.len) == | |
152 | (NS_IN6ADDRSZ / NS_INT16SZ)) | |
153 | *tp++ = ':'; | |
154 | *tp++ = '\0'; | |
155 | ||
156 | /* | |
157 | * Check for overflow, copy, and we're done. | |
158 | */ | |
159 | if ((size_t)(tp - tmp) > size) { | |
160 | errno = ENOSPC; | |
161 | return (NULL); | |
162 | } | |
163 | strcpy(dst, tmp); | |
164 | return (dst); | |
165 | } | |
166 | #endif | |
167 | ||
168 | /* char * | |
169 | * inet_ntop(af, src, dst, size) | |
170 | * convert a network format address to presentation format. | |
171 | * return: | |
172 | * pointer to presentation format address (`dst'), or NULL (see errno). | |
173 | * author: | |
174 | * Paul Vixie, 1996. | |
175 | */ | |
176 | const char * | |
bb34c5aa | 177 | inet_ntop(int af, const void *src, char *dst, size_t size) |
6ba68ab2 YL |
178 | { |
179 | switch (af) { | |
180 | case AF_INET: | |
181 | return (inet_ntop4(src, dst, size)); | |
182 | #ifndef NO_IPV6 | |
183 | case AF_INET6: | |
184 | return (inet_ntop6(src, dst, size)); | |
185 | #endif | |
186 | default: | |
187 | errno = EAFNOSUPPORT; | |
188 | return (NULL); | |
189 | } | |
190 | /* NOTREACHED */ | |
191 | } |