mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/* $OpenBSD: inet.c,v 1.7 2004/05/04 21:48:16 deraadt Exp $ */
|
|
|
|
/*
|
|
* Subroutines to manipulate internet addresses in a safely portable
|
|
* way...
|
|
*/
|
|
|
|
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* 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>
|
|
#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;
|
|
unsigned 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;
|
|
unsigned 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);
|
|
}
|