| 1 | /* Compress a DNS domain name in presentation format. |
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| 2 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
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| 3 | * Copyright (c) 1996,1999 by Internet Software Consortium. |
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| 4 | * |
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| 5 | * Permission to use, copy, modify, and distribute this software for any |
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| 6 | * purpose with or without fee is hereby granted, provided that the above |
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| 7 | * copyright notice and this permission notice appear in all copies. |
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| 8 | * |
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| 9 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
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| 10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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| 11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
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| 12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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| 13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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| 14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
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| 15 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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| 16 | */ |
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| 17 | |
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| 18 | #include <arpa/nameser.h> |
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| 19 | #include <shlib-compat.h> |
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| 20 | |
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| 21 | /* Compresses a domain name into wire format, using compression pointers. |
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| 22 | Returns the number of bytes consumed in DST or -1 (with errno set). |
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| 23 | |
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| 24 | DNPTRS is an array of pointers to previous compressed names. |
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| 25 | DNPTRS[0] is a pointer to the beginning of the message. |
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| 26 | |
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| 27 | The list ends with NULL. LASTDNPTR is a pointer to the end of the |
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| 28 | array pointed to by DNPTRS. Side effect is to update the list of |
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| 29 | pointers for labels inserted into the message as we compress the |
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| 30 | name. If DNPTRS is NULL, we don't try to compress names. If |
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| 31 | LASTDNPTR * is NULL, we don't update the list. */ |
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| 32 | int |
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| 33 | ___ns_name_compress (const char *src, unsigned char *dst, size_t dstsiz, |
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| 34 | const unsigned char **dnptrs, |
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| 35 | const unsigned char **lastdnptr) |
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| 36 | { |
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| 37 | unsigned char tmp[NS_MAXCDNAME]; |
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| 38 | |
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| 39 | if (__ns_name_pton (src, tmp, sizeof tmp) < 0) |
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| 40 | return -1; |
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| 41 | return __ns_name_pack (tmp, dst, dstsiz, dnptrs, lastdnptr); |
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| 42 | } |
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| 43 | versioned_symbol (libc, ___ns_name_compress, ns_name_compress, GLIBC_2_34); |
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| 44 | versioned_symbol (libc, ___ns_name_compress, __ns_name_compress, |
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| 45 | GLIBC_PRIVATE); |
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| 46 | libc_hidden_ver (___ns_name_compress, __ns_name_compress) |
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| 47 | |
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| 48 | #if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34) |
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| 49 | compat_symbol (libresolv, ___ns_name_compress, ns_name_compress, GLIBC_2_9); |
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| 50 | #endif |
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| 51 | |
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