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/*
* Copyright (c) 2008, Stefan Walter
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and
* the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * The names of contributors to this software may not be
* used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#include "soa.h"
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#define SEPARATORS " \t\n\v()"
int
soa_serial_increment (const char *old_soa, char *new_soa, unsigned int new_len)
{
unsigned long value;
const char *p, *beg;
char *end;
unsigned int len;
assert (old_soa);
assert (new_soa);
/* Check that we can add a digit */
len = strlen (old_soa);
assert (new_len >= len + 2);
p = old_soa;
/* Eat up space at the beginning */
while (*p && strchr (SEPARATORS, *p))
++p;
/* Skip over domain name, to next sep */
while (*p && !strchr (SEPARATORS, *p))
++p;
/* Eat up space between */
while (*p && strchr (SEPARATORS, *p))
++p;
/* Skip over administrator email, to next sep */
while (*p && !strchr (SEPARATORS, *p))
++p;
/* Eat up spaces between */
while (*p && strchr (SEPARATORS, *p))
++p;
if (*p == 0 || !isdigit (*p)) {
errno = EINVAL;
return -1;
}
/* Parse the integer here */
beg = p;
value = strtoul (beg, &end, 10);
if (beg == end || !strchr (SEPARATORS, *end)) {
errno = EINVAL;
return -1;
}
/* Increment the integer appropriately */
if (value == 0xFFFFFFFF)
value = 1; /* Zero is recommended against in RFC 1982 */
else
++value;
/* Build up the new SOA */
memset (new_soa, 0, new_len);
len = beg - old_soa;
strncpy (new_soa, old_soa, len);
snprintf (new_soa + len, 32, "%lu", value);
len = strlen (new_soa);
strcpy (new_soa + len, end);
len = strlen (new_soa);
assert (len < new_len);
return len;
}
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