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dns_domain.c
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dns_domain.c
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/*
* dns_domain.c: This file is part of the `djbdns' project, originally written
* by Dr. D J Bernstein and later released under public-domain since late
* December 2007 (http://cr.yp.to/distributors.html).
*
* Copyright (C) 2009 - 2012 Prasad J Pandit
*
* This program is a free software; you can redistribute it and/or modify
* it under the terms of GNU General Public License as published by Free
* Software Foundation; either version 2 of the license or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* of FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <assert.h>
#include <unistd.h>
#include "dns.h"
#include "case.h"
#include "byte.h"
#include "error.h"
#include "alloc.h"
unsigned int
dns_domain_length (const char *dn)
{
const char *x = dn;
unsigned char c = 0;
if (x)
while ((c = *x++))
x += (unsigned int) c;
return x - dn;
}
void
dns_domain_free (char **out)
{
if (*out)
{
alloc_free (*out);
*out = 0;
}
}
int
dns_domain_copy (char **out, const char *in)
{
char *x = NULL;
unsigned int len = 0;
assert (in != NULL);
assert (out != NULL);
len = dns_domain_length (in);
if (!(x = alloc (len)))
return 0;
byte_copy (x, len, in);
if (*out)
alloc_free (*out);
*out = x;
return 1;
}
int
dns_domain_equal (const char *dn1, const char *dn2)
{
unsigned int len = 0;
len = dns_domain_length (dn1);
if (len != dns_domain_length (dn2))
return 0;
if (case_diffb (dn1, len, dn2))
return 0; /* safe since 63 < 'A' */
return 1;
}
int
dns_domain_suffix (const char *big, const char *little)
{
unsigned char c = 0;
for (;;)
{
if (dns_domain_equal (big, little))
return 1;
if (!(c = *big++))
return 0;
big += c;
}
}
unsigned int
dns_domain_suffixpos (const char *big, const char *little)
{
unsigned char c = 0;
const char *orig = big;
for (;;)
{
if (dns_domain_equal (big, little))
return big - orig;
if (!(c = *big++))
return 0;
big += c;
}
}