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Commit | Line | Data |
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13e1f867 FW |
1 | /* Compress a DNS domain name in presentation format. |
2 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") | |
3 | * Copyright (c) 1996,1999 by Internet Software Consortium. | |
4 | * | |
5 | * Permission to use, copy, modify, and distribute this software for any | |
6 | * purpose with or without fee is hereby granted, provided that the above | |
7 | * copyright notice and this permission notice appear in all copies. | |
8 | * | |
9 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES | |
10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR | |
12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
15 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
16 | */ | |
17 | ||
18 | #include <arpa/nameser.h> | |
19 | #include <shlib-compat.h> | |
20 | ||
21 | /* Compresses a domain name into wire format, using compression pointers. | |
22 | Returns the number of bytes consumed in DST or -1 (with errno set). | |
23 | ||
24 | DNPTRS is an array of pointers to previous compressed names. | |
25 | DNPTRS[0] is a pointer to the beginning of the message. | |
26 | ||
27 | The list ends with NULL. LASTDNPTR is a pointer to the end of the | |
28 | array pointed to by DNPTRS. Side effect is to update the list of | |
29 | pointers for labels inserted into the message as we compress the | |
30 | name. If DNPTRS is NULL, we don't try to compress names. If | |
31 | LASTDNPTR * is NULL, we don't update the list. */ | |
32 | int | |
33 | ___ns_name_compress (const char *src, unsigned char *dst, size_t dstsiz, | |
34 | const unsigned char **dnptrs, | |
35 | const unsigned char **lastdnptr) | |
36 | { | |
37 | unsigned char tmp[NS_MAXCDNAME]; | |
38 | ||
39 | if (__ns_name_pton (src, tmp, sizeof tmp) < 0) | |
40 | return -1; | |
41 | return __ns_name_pack (tmp, dst, dstsiz, dnptrs, lastdnptr); | |
42 | } | |
43 | versioned_symbol (libc, ___ns_name_compress, ns_name_compress, GLIBC_2_34); | |
44 | versioned_symbol (libc, ___ns_name_compress, __ns_name_compress, | |
45 | GLIBC_PRIVATE); | |
46 | libc_hidden_ver (___ns_name_compress, __ns_name_compress) | |
47 | ||
48 | #if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34) | |
49 | compat_symbol (libresolv, ___ns_name_compress, ns_name_compress, GLIBC_2_9); | |
50 | #endif |