ip.c

此dns服务器是在mydns基础上改写

/**************************************************************************************************
	$Id: ip.c,v 1.9 2005/04/20 16:43:22 bboy Exp $
	ip.c: Routines to manipulate IP addresses.

	Copyright (C) 2002-2005  Don Moore <[e-mail]>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the 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 or 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 the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**************************************************************************************************/

#include "mydns.h"


/**************************************************************************************************
	MYDNS_REVSTR_IP4
	Provided with a string like "4.3.2.1", returns the numeric equivalent (of "1.2.3.4") as an
	IPv4 address, in host byte order.
**************************************************************************************************/
uint32_t
mydns_revstr_ip4(char *s)
{
	register char *c, n;
	uint8_t	ip[4];
	uint32_t	rv;

	ip[0] = ip[1] = ip[2] = ip[3] = 0;
	for (c = s, n = 0; *c && n < 4; c++)
		if (c == s || *c == '.')
		{
			if (*c == '.') c++;
			ip[3-n] = (uint8_t)atoi(c);
			n++;
		}
	memcpy(&rv, ip, sizeof(rv));
	return (rv);
}
/*--- mydns_revstr_ip4() ------------------------------------------------------------------------*/


/**************************************************************************************************
	MYDNS_EXTRACT_ARPA
	Given an "in-addr.arpa" address, loads the specified octets and returns the number of octets
	found.
**************************************************************************************************/
int
mydns_extract_arpa(char *s, uint8_t ip[])
{
	register char	*c;
	register int	n;

	ip[0] = ip[1] = ip[2] = ip[3] = 0;
	for (c = s, n = 0; *c && n < 4; c++)
		if (c == s || *c == '.')
		{
			if (*c == '.') c++;
			if (!isdigit(*c))
				return (n);
			ip[n++] = (uint8_t)atoi(c);
		}
	return (n);
}
/*--- mydns_extract_arpa() ----------------------------------------------------------------------*/

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