[164] | 1 | /*
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| 2 | * Copyright (C) 1996-2001 Internet Software Consortium.
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| 3 | *
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| 4 | * Permission to use, copy, modify, and distribute this software for any
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| 5 | * purpose with or without fee is hereby granted, provided that the above
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| 6 | * copyright notice and this permission notice appear in all copies.
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| 7 | *
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| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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| 9 | * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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| 10 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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| 11 | * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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| 12 | * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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| 13 | * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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| 14 | * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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| 15 | * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 16 | */
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| 17 | /*
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| 18 | * Original code by Paul Vixie. "curlified" by Gisle Vanem.
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| 19 | */
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| 20 |
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| 21 | #include "curl_setup.h"
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| 22 |
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| 23 | #ifndef HAVE_INET_NTOP
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| 24 |
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| 25 | #ifdef HAVE_SYS_PARAM_H
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| 26 | #include <sys/param.h>
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| 27 | #endif
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| 28 | #ifdef HAVE_NETINET_IN_H
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| 29 | #include <netinet/in.h>
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| 30 | #endif
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| 31 | #ifdef HAVE_ARPA_INET_H
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| 32 | #include <arpa/inet.h>
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| 33 | #endif
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| 34 |
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| 35 | #include "curl_printf.h"
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| 36 |
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| 37 | #include "inet_ntop.h"
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| 38 |
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| 39 | #define IN6ADDRSZ 16
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| 40 | #define INADDRSZ 4
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| 41 | #define INT16SZ 2
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| 42 |
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| 43 | /*
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| 44 | * Format an IPv4 address, more or less like inet_ntoa().
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| 45 | *
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| 46 | * Returns `dst' (as a const)
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| 47 | * Note:
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| 48 | * - uses no statics
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| 49 | * - takes a unsigned char* not an in_addr as input
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| 50 | */
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| 51 | static char *inet_ntop4 (const unsigned char *src, char *dst, size_t size)
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| 52 | {
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| 53 | char tmp[sizeof "255.255.255.255"];
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| 54 | size_t len;
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| 55 |
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| 56 | DEBUGASSERT(size >= 16);
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| 57 |
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| 58 | tmp[0] = '\0';
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| 59 | (void)snprintf(tmp, sizeof(tmp), "%d.%d.%d.%d",
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| 60 | ((int)((unsigned char)src[0])) & 0xff,
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| 61 | ((int)((unsigned char)src[1])) & 0xff,
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| 62 | ((int)((unsigned char)src[2])) & 0xff,
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| 63 | ((int)((unsigned char)src[3])) & 0xff);
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| 64 |
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| 65 | len = strlen(tmp);
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| 66 | if(len == 0 || len >= size) {
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| 67 | SET_ERRNO(ENOSPC);
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| 68 | return (NULL);
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| 69 | }
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| 70 | strcpy(dst, tmp);
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| 71 | return dst;
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| 72 | }
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| 73 |
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| 74 | #ifdef ENABLE_IPV6
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| 75 | /*
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| 76 | * Convert IPv6 binary address into presentation (printable) format.
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| 77 | */
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| 78 | static char *inet_ntop6 (const unsigned char *src, char *dst, size_t size)
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| 79 | {
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| 80 | /*
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| 81 | * Note that int32_t and int16_t need only be "at least" large enough
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| 82 | * to contain a value of the specified size. On some systems, like
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| 83 | * Crays, there is no such thing as an integer variable with 16 bits.
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| 84 | * Keep this in mind if you think this function should have been coded
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| 85 | * to use pointer overlays. All the world's not a VAX.
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| 86 | */
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| 87 | char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
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| 88 | char *tp;
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| 89 | struct {
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| 90 | long base;
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| 91 | long len;
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| 92 | } best, cur;
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| 93 | unsigned long words[IN6ADDRSZ / INT16SZ];
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| 94 | int i;
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| 95 |
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| 96 | /* Preprocess:
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| 97 | * Copy the input (bytewise) array into a wordwise array.
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| 98 | * Find the longest run of 0x00's in src[] for :: shorthanding.
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| 99 | */
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| 100 | memset(words, '\0', sizeof(words));
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| 101 | for(i = 0; i < IN6ADDRSZ; i++)
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| 102 | words[i/2] |= (src[i] << ((1 - (i % 2)) << 3));
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| 103 |
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| 104 | best.base = -1;
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| 105 | cur.base = -1;
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| 106 | best.len = 0;
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| 107 | cur.len = 0;
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| 108 |
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| 109 | for(i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
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| 110 | if(words[i] == 0) {
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| 111 | if(cur.base == -1)
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| 112 | cur.base = i, cur.len = 1;
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| 113 | else
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| 114 | cur.len++;
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| 115 | }
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| 116 | else if(cur.base != -1) {
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| 117 | if(best.base == -1 || cur.len > best.len)
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| 118 | best = cur;
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| 119 | cur.base = -1;
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| 120 | }
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| 121 | }
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| 122 | if((cur.base != -1) && (best.base == -1 || cur.len > best.len))
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| 123 | best = cur;
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| 124 | if(best.base != -1 && best.len < 2)
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| 125 | best.base = -1;
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| 126 | /* Format the result. */
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| 127 | tp = tmp;
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| 128 | for(i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
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| 129 | /* Are we inside the best run of 0x00's? */
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| 130 | if(best.base != -1 && i >= best.base && i < (best.base + best.len)) {
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| 131 | if(i == best.base)
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| 132 | *tp++ = ':';
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| 133 | continue;
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| 134 | }
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| 135 |
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| 136 | /* Are we following an initial run of 0x00s or any real hex?
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| 137 | */
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| 138 | if(i != 0)
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| 139 | *tp++ = ':';
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| 140 |
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| 141 | /* Is this address an encapsulated IPv4?
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| 142 | */
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| 143 | if(i == 6 && best.base == 0 &&
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| 144 | (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
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| 145 | if(!inet_ntop4(src+12, tp, sizeof(tmp) - (tp - tmp))) {
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| 146 | SET_ERRNO(ENOSPC);
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| 147 | return (NULL);
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| 148 | }
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| 149 | tp += strlen(tp);
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| 150 | break;
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| 151 | }
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| 152 | tp += snprintf(tp, 5, "%lx", words[i]);
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| 153 | }
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| 154 |
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| 155 | /* Was it a trailing run of 0x00's?
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| 156 | */
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| 157 | if(best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
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| 158 | *tp++ = ':';
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| 159 | *tp++ = '\0';
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| 160 |
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| 161 | /* Check for overflow, copy, and we're done.
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| 162 | */
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| 163 | if((size_t)(tp - tmp) > size) {
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| 164 | SET_ERRNO(ENOSPC);
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| 165 | return (NULL);
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| 166 | }
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| 167 | strcpy(dst, tmp);
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| 168 | return dst;
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| 169 | }
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| 170 | #endif /* ENABLE_IPV6 */
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| 171 |
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| 172 | /*
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| 173 | * Convert a network format address to presentation format.
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| 174 | *
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| 175 | * Returns pointer to presentation format address (`buf').
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| 176 | * Returns NULL on error and errno set with the specific
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| 177 | * error, EAFNOSUPPORT or ENOSPC.
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| 178 | *
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| 179 | * On Windows we store the error in the thread errno, not
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| 180 | * in the winsock error code. This is to avoid losing the
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| 181 | * actual last winsock error. So use macro ERRNO to fetch the
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| 182 | * errno this function sets when returning NULL, not SOCKERRNO.
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| 183 | */
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| 184 | char *Curl_inet_ntop(int af, const void *src, char *buf, size_t size)
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| 185 | {
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| 186 | switch (af) {
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| 187 | case AF_INET:
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| 188 | return inet_ntop4((const unsigned char*)src, buf, size);
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| 189 | #ifdef ENABLE_IPV6
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| 190 | case AF_INET6:
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| 191 | return inet_ntop6((const unsigned char*)src, buf, size);
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| 192 | #endif
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| 193 | default:
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| 194 | SET_ERRNO(EAFNOSUPPORT);
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| 195 | return NULL;
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| 196 | }
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| 197 | }
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| 198 | #endif /* HAVE_INET_NTOP */
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