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/* $OpenBSD: inet.c,v 1.7 2004/05/04 21:48:16 deraadt Exp $ */
/*
* Subroutines to manipulate internet addresses in a safely portable
* way...
*/
/*
* Copyright (c) 1996 The Internet Software Consortium. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of The Internet Software Consortium nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM 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 INTERNET SOFTWARE CONSORTIUM 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.
*
* This software has been written for the Internet Software Consortium
* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
* Enterprises. To learn more about the Internet Software Consortium,
* see ``http://www.vix.com/isc''. To learn more about Vixie
* Enterprises, see ``http://www.vix.com''.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "dhcpd.h"
/*
* Return just the network number of an internet address...
*/
struct iaddr
subnet_number(struct iaddr addr, struct iaddr mask)
{
struct iaddr rv;
int i;
rv.len = 0;
/* Both addresses must have the same length... */
if (addr.len != mask.len)
return (rv);
rv.len = addr.len;
for (i = 0; i < rv.len; i++)
rv.iabuf[i] = addr.iabuf[i] & mask.iabuf[i];
return (rv);
}
/*
* Given a subnet number and netmask, return the address on that subnet
* for which the host portion of the address is all ones (the standard
* broadcast address).
*/
struct iaddr
broadcast_addr(struct iaddr subnet, struct iaddr mask)
{
struct iaddr rv;
int i;
if (subnet.len != mask.len) {
rv.len = 0;
return (rv);
}
for (i = 0; i < subnet.len; i++)
rv.iabuf[i] = subnet.iabuf[i] | (~mask.iabuf[i] & 255);
rv.len = subnet.len;
return (rv);
}
int
addr_eq(struct iaddr addr1, struct iaddr addr2)
{
if (addr1.len != addr2.len)
return (0);
return (memcmp(addr1.iabuf, addr2.iabuf, addr1.len) == 0);
}
char *
piaddr(struct iaddr addr)
{
static char pbuf[32];
struct in_addr a;
char *s;
memcpy(&a, &(addr.iabuf), sizeof(struct in_addr));
if (addr.len == 0)
strlcpy(pbuf, "<null address>", sizeof(pbuf));
else {
s = inet_ntoa(a);
if (s != NULL)
strlcpy(pbuf, s, sizeof(pbuf));
else
strlcpy(pbuf, "<invalid address>", sizeof(pbuf));
}
return (pbuf);
}
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