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| 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 | |
| 18 | |
| 19 #include "replace.h" | |
| 20 #include "system/network.h" | |
| 21 | |
| 22 #define NS_INT16SZ 2 | |
| 23 #define NS_IN6ADDRSZ 16 | |
| 24 | |
| 25 /* | |
| 26 * WARNING: Don't even consider trying to compile this on a system where | |
| 27 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. | |
| 28 */ | |
| 29 | |
| 30 static const char *inet_ntop4(const unsigned char *src, char *dst, | |
| 31 socklen_t size); | |
| 32 | |
| 33 #ifdef AF_INET6 | |
| 34 static const char *inet_ntop6(const unsigned char *src, char *dst, | |
| 35 socklen_t size); | |
| 36 #endif | |
| 37 | |
| 38 /* char * | |
| 39 * isc_net_ntop(af, src, dst, size) | |
| 40 * convert a network format address to presentation format. | |
| 41 * return: | |
| 42 * pointer to presentation format address (`dst'), or NULL (see errno). | |
| 43 * author: | |
| 44 * Paul Vixie, 1996. | |
| 45 */ | |
| 46 const char * | |
| 47 rep_inet_ntop(int af, const void *src, char *dst, socklen_t size) | |
| 48 { | |
| 49 switch (af) { | |
| 50 case AF_INET: | |
| 51 return (inet_ntop4(src, dst, size)); | |
| 52 #ifdef AF_INET6 | |
| 53 case AF_INET6: | |
| 54 return (inet_ntop6(src, dst, size)); | |
| 55 #endif | |
| 56 default: | |
| 57 errno = EAFNOSUPPORT; | |
| 58 return (NULL); | |
| 59 } | |
| 60 /* NOTREACHED */ | |
| 61 } | |
| 62 | |
| 63 /* const char * | |
| 64 * inet_ntop4(src, dst, size) | |
| 65 * format an IPv4 address | |
| 66 * return: | |
| 67 * `dst' (as a const) | |
| 68 * notes: | |
| 69 * (1) uses no statics | |
| 70 * (2) takes a unsigned char* not an in_addr as input | |
| 71 * author: | |
| 72 * Paul Vixie, 1996. | |
| 73 */ | |
| 74 static const char * | |
| 75 inet_ntop4(const unsigned char *src, char *dst, socklen_t size) | |
| 76 { | |
| 77 static const char *fmt = "%u.%u.%u.%u"; | |
| 78 char tmp[sizeof "255.255.255.255"]; | |
| 79 size_t len; | |
| 80 | |
| 81 len = snprintf(tmp, sizeof tmp, fmt, src[0], src[1], src[2], src[3]); | |
| 82 if (len >= size) { | |
| 83 errno = ENOSPC; | |
| 84 return (NULL); | |
| 85 } | |
| 86 memcpy(dst, tmp, len + 1); | |
| 87 | |
| 88 return (dst); | |
| 89 } | |
| 90 | |
| 91 /* const char * | |
| 92 * isc_inet_ntop6(src, dst, size) | |
| 93 * convert IPv6 binary address into presentation (printable) format | |
| 94 * author: | |
| 95 * Paul Vixie, 1996. | |
| 96 */ | |
| 97 #ifdef AF_INET6 | |
| 98 static const char * | |
| 99 inet_ntop6(const unsigned char *src, char *dst, socklen_t size) | |
| 100 { | |
| 101 /* | |
| 102 * Note that int32_t and int16_t need only be "at least" large enough | |
| 103 * to contain a value of the specified size. On some systems, like | |
| 104 * Crays, there is no such thing as an integer variable with 16 bits. | |
| 105 * Keep this in mind if you think this function should have been coded | |
| 106 * to use pointer overlays. All the world's not a VAX. | |
| 107 */ | |
| 108 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; | |
| 109 struct { int base, len; } best, cur; | |
| 110 unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ]; | |
| 111 int i, inc; | |
| 112 | |
| 113 /* | |
| 114 * Preprocess: | |
| 115 * Copy the input (bytewise) array into a wordwise array. | |
| 116 * Find the longest run of 0x00's in src[] for :: shorthanding. | |
| 117 */ | |
| 118 memset(words, '\0', sizeof words); | |
| 119 for (i = 0; i < NS_IN6ADDRSZ; i++) | |
| 120 words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); | |
| 121 best.base = -1; | |
| 122 best.len = 0; | |
| 123 cur.base = -1; | |
| 124 cur.len = 0; | |
| 125 for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { | |
| 126 if (words[i] == 0) { | |
| 127 if (cur.base == -1) | |
| 128 cur.base = i, cur.len = 1; | |
| 129 else | |
| 130 cur.len++; | |
| 131 } else { | |
| 132 if (cur.base != -1) { | |
| 133 if (best.base == -1 || cur.len > best.len) | |
| 134 best = cur; | |
| 135 cur.base = -1; | |
| 136 } | |
| 137 } | |
| 138 } | |
| 139 if (cur.base != -1) { | |
| 140 if (best.base == -1 || cur.len > best.len) | |
| 141 best = cur; | |
| 142 } | |
| 143 if (best.base != -1 && best.len < 2) | |
| 144 best.base = -1; | |
| 145 | |
| 146 /* | |
| 147 * Format the result. | |
| 148 */ | |
| 149 tp = tmp; | |
| 150 for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { | |
| 151 /* Are we inside the best run of 0x00's? */ | |
| 152 if (best.base != -1 && i >= best.base && | |
| 153 i < (best.base + best.len)) { | |
| 154 if (i == best.base) | |
| 155 *tp++ = ':'; | |
| 156 continue; | |
| 157 } | |
| 158 /* Are we following an initial run of 0x00s or any real hex? */ | |
| 159 if (i != 0) | |
| 160 *tp++ = ':'; | |
| 161 /* Is this address an encapsulated IPv4? */ | |
| 162 if (i == 6 && best.base == 0 && | |
| 163 (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { | |
| 164 if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) | |
| 165 return (NULL); | |
| 166 tp += strlen(tp); | |
| 167 break; | |
| 168 } | |
| 169 inc = snprintf(tp, 5, "%x", words[i]); | |
| 170 if (inc >= 5) { | |
| 171 abort(); | |
| 172 } | |
| 173 tp += inc; | |
| 174 } | |
| 175 /* Was it a trailing run of 0x00's? */ | |
| 176 if (best.base != -1 && (best.base + best.len) == | |
| 177 (NS_IN6ADDRSZ / NS_INT16SZ)) | |
| 178 *tp++ = ':'; | |
| 179 *tp++ = '\0'; | |
| 180 | |
| 181 /* | |
| 182 * Check for overflow, copy, and we're done. | |
| 183 */ | |
| 184 if ((size_t)(tp - tmp) > size) { | |
| 185 errno = ENOSPC; | |
| 186 return (NULL); | |
| 187 } | |
| 188 memcpy(dst, tmp, tp - tmp); | |
| 189 return (dst); | |
| 190 } | |
| 191 #endif /* AF_INET6 */ | |
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Chromium Code Reviews
Issue 2282793002:
Remove unused third_party/talloc (Closed)
