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86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*
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* util/data/dname.h - domain name handling
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains domain name handling functions.
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*/
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#include "config.h"
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#include "util/data/dname.h"
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#include "util/log.h"
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/** determine length of a dname in buffer, no compression pointers allowed. */
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size_t
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query_dname_len(ldns_buffer* query)
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{
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size_t len = 0;
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size_t labellen;
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while(1) {
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if(ldns_buffer_remaining(query) < 1)
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return 0; /* parse error, need label len */
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labellen = ldns_buffer_read_u8(query);
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if(labellen & 0xC0)
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return 0; /* no compression allowed in queries */
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len += labellen + 1;
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if(len > LDNS_MAX_DOMAINLEN)
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return 0; /* too long */
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if(labellen == 0)
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return len;
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if(ldns_buffer_remaining(query) < labellen)
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return 0; /* parse error, need content */
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ldns_buffer_skip(query, (ssize_t)labellen);
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}
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}
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void
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query_dname_tolower(uint8_t* dname, size_t len)
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{
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/* the dname is stored uncompressed */
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uint8_t labellen;
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log_assert(len > 0);
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labellen = *dname;
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while(labellen) {
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dname++;
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while(labellen--) {
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*dname = (uint8_t)tolower((int)*dname);
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dname++;
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}
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labellen = *dname;
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}
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}
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