Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 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 | * Original code by Paul Vixie. "curlified" by Gisle Vanem. |
| 19 | */ |
| 20 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 21 | #include "curl_setup.h" |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 22 | |
| 23 | #ifndef HAVE_INET_NTOP |
| 24 | |
| 25 | #ifdef HAVE_SYS_PARAM_H |
| 26 | #include <sys/param.h> |
| 27 | #endif |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 28 | #ifdef HAVE_NETINET_IN_H |
| 29 | #include <netinet/in.h> |
| 30 | #endif |
| 31 | #ifdef HAVE_ARPA_INET_H |
| 32 | #include <arpa/inet.h> |
| 33 | #endif |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 34 | |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 35 | #include "inet_ntop.h" |
Alex Deymo | 8f1a214 | 2016-06-28 14:49:26 -0700 | [diff] [blame] | 36 | #include "curl_printf.h" |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 37 | |
| 38 | #define IN6ADDRSZ 16 |
| 39 | #define INADDRSZ 4 |
| 40 | #define INT16SZ 2 |
| 41 | |
| 42 | /* |
| 43 | * Format an IPv4 address, more or less like inet_ntoa(). |
| 44 | * |
| 45 | * Returns `dst' (as a const) |
| 46 | * Note: |
| 47 | * - uses no statics |
| 48 | * - takes a unsigned char* not an in_addr as input |
| 49 | */ |
| 50 | static char *inet_ntop4 (const unsigned char *src, char *dst, size_t size) |
| 51 | { |
| 52 | char tmp[sizeof "255.255.255.255"]; |
| 53 | size_t len; |
| 54 | |
| 55 | DEBUGASSERT(size >= 16); |
| 56 | |
| 57 | tmp[0] = '\0'; |
| 58 | (void)snprintf(tmp, sizeof(tmp), "%d.%d.%d.%d", |
Alex Deymo | 8f1a214 | 2016-06-28 14:49:26 -0700 | [diff] [blame] | 59 | ((int)((unsigned char)src[0])) & 0xff, |
| 60 | ((int)((unsigned char)src[1])) & 0xff, |
| 61 | ((int)((unsigned char)src[2])) & 0xff, |
| 62 | ((int)((unsigned char)src[3])) & 0xff); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 63 | |
| 64 | len = strlen(tmp); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 65 | if(len == 0 || len >= size) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 66 | SET_ERRNO(ENOSPC); |
| 67 | return (NULL); |
| 68 | } |
| 69 | strcpy(dst, tmp); |
| 70 | return dst; |
| 71 | } |
| 72 | |
| 73 | #ifdef ENABLE_IPV6 |
| 74 | /* |
| 75 | * Convert IPv6 binary address into presentation (printable) format. |
| 76 | */ |
| 77 | static char *inet_ntop6 (const unsigned char *src, char *dst, size_t size) |
| 78 | { |
| 79 | /* |
| 80 | * Note that int32_t and int16_t need only be "at least" large enough |
| 81 | * to contain a value of the specified size. On some systems, like |
| 82 | * Crays, there is no such thing as an integer variable with 16 bits. |
| 83 | * Keep this in mind if you think this function should have been coded |
| 84 | * to use pointer overlays. All the world's not a VAX. |
| 85 | */ |
| 86 | char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")]; |
| 87 | char *tp; |
| 88 | struct { |
| 89 | long base; |
| 90 | long len; |
| 91 | } best, cur; |
| 92 | unsigned long words[IN6ADDRSZ / INT16SZ]; |
| 93 | int i; |
| 94 | |
| 95 | /* Preprocess: |
| 96 | * Copy the input (bytewise) array into a wordwise array. |
| 97 | * Find the longest run of 0x00's in src[] for :: shorthanding. |
| 98 | */ |
| 99 | memset(words, '\0', sizeof(words)); |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 100 | for(i = 0; i < IN6ADDRSZ; i++) |
| 101 | words[i/2] |= (src[i] << ((1 - (i % 2)) << 3)); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 102 | |
| 103 | best.base = -1; |
| 104 | cur.base = -1; |
| 105 | best.len = 0; |
| 106 | cur.len = 0; |
| 107 | |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 108 | for(i = 0; i < (IN6ADDRSZ / INT16SZ); i++) { |
| 109 | if(words[i] == 0) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 110 | if(cur.base == -1) |
| 111 | cur.base = i, cur.len = 1; |
| 112 | else |
| 113 | cur.len++; |
| 114 | } |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 115 | else if(cur.base != -1) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 116 | if(best.base == -1 || cur.len > best.len) |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 117 | best = cur; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 118 | cur.base = -1; |
| 119 | } |
| 120 | } |
| 121 | if((cur.base != -1) && (best.base == -1 || cur.len > best.len)) |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 122 | best = cur; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 123 | if(best.base != -1 && best.len < 2) |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 124 | best.base = -1; |
| 125 | /* Format the result. */ |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 126 | tp = tmp; |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 127 | for(i = 0; i < (IN6ADDRSZ / INT16SZ); i++) { |
| 128 | /* Are we inside the best run of 0x00's? */ |
| 129 | if(best.base != -1 && i >= best.base && i < (best.base + best.len)) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 130 | if(i == best.base) |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 131 | *tp++ = ':'; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 132 | continue; |
| 133 | } |
| 134 | |
| 135 | /* Are we following an initial run of 0x00s or any real hex? |
| 136 | */ |
| 137 | if(i != 0) |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 138 | *tp++ = ':'; |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 139 | |
| 140 | /* Is this address an encapsulated IPv4? |
| 141 | */ |
| 142 | if(i == 6 && best.base == 0 && |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 143 | (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { |
| 144 | if(!inet_ntop4(src+12, tp, sizeof(tmp) - (tp - tmp))) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 145 | SET_ERRNO(ENOSPC); |
| 146 | return (NULL); |
| 147 | } |
| 148 | tp += strlen(tp); |
| 149 | break; |
| 150 | } |
| 151 | tp += snprintf(tp, 5, "%lx", words[i]); |
| 152 | } |
| 153 | |
| 154 | /* Was it a trailing run of 0x00's? |
| 155 | */ |
| 156 | if(best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ)) |
| 157 | *tp++ = ':'; |
| 158 | *tp++ = '\0'; |
| 159 | |
| 160 | /* Check for overflow, copy, and we're done. |
| 161 | */ |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 162 | if((size_t)(tp - tmp) > size) { |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 163 | SET_ERRNO(ENOSPC); |
| 164 | return (NULL); |
| 165 | } |
| 166 | strcpy(dst, tmp); |
| 167 | return dst; |
| 168 | } |
| 169 | #endif /* ENABLE_IPV6 */ |
| 170 | |
| 171 | /* |
| 172 | * Convert a network format address to presentation format. |
| 173 | * |
| 174 | * Returns pointer to presentation format address (`buf'). |
| 175 | * Returns NULL on error and errno set with the specific |
| 176 | * error, EAFNOSUPPORT or ENOSPC. |
| 177 | * |
| 178 | * On Windows we store the error in the thread errno, not |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 179 | * in the winsock error code. This is to avoid losing the |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 180 | * actual last winsock error. So use macro ERRNO to fetch the |
Bertrand SIMONNET | e6cd738 | 2015-07-01 15:39:44 -0700 | [diff] [blame] | 181 | * errno this function sets when returning NULL, not SOCKERRNO. |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 182 | */ |
| 183 | char *Curl_inet_ntop(int af, const void *src, char *buf, size_t size) |
| 184 | { |
| 185 | switch (af) { |
| 186 | case AF_INET: |
Elliott Hughes | cee0338 | 2017-06-23 12:17:18 -0700 | [diff] [blame^] | 187 | return inet_ntop4((const unsigned char *)src, buf, size); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 188 | #ifdef ENABLE_IPV6 |
| 189 | case AF_INET6: |
Elliott Hughes | cee0338 | 2017-06-23 12:17:18 -0700 | [diff] [blame^] | 190 | return inet_ntop6((const unsigned char *)src, buf, size); |
Kristian Monsen | 5ab5018 | 2010-05-14 18:53:44 +0100 | [diff] [blame] | 191 | #endif |
| 192 | default: |
| 193 | SET_ERRNO(EAFNOSUPPORT); |
| 194 | return NULL; |
| 195 | } |
| 196 | } |
| 197 | #endif /* HAVE_INET_NTOP */ |