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119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/* $OpenBSD: inet.c,v 1.7 2004/05/04 21:48:16 deraadt Exp $ */
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/*
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* Subroutines to manipulate internet addresses in a safely portable
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* way...
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*/
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/*
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* Copyright (c) 1996 The Internet Software Consortium. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of The Internet Software Consortium nor the names
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* of its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This software has been written for the Internet Software Consortium
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* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
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* Enterprises. To learn more about the Internet Software Consortium,
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* see ``http://www.vix.com/isc''. To learn more about Vixie
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* Enterprises, see ``http://www.vix.com''.
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*/
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#include "dhcpd.h"
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/*
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* Return just the network number of an internet address...
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*/
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struct iaddr
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subnet_number(struct iaddr addr, struct iaddr mask)
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{
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struct iaddr rv;
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int i;
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rv.len = 0;
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/* Both addresses must have the same length... */
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if (addr.len != mask.len)
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return (rv);
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rv.len = addr.len;
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for (i = 0; i < rv.len; i++)
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rv.iabuf[i] = addr.iabuf[i] & mask.iabuf[i];
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return (rv);
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}
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/*
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* Given a subnet number and netmask, return the address on that subnet
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* for which the host portion of the address is all ones (the standard
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* broadcast address).
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*/
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struct iaddr
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broadcast_addr(struct iaddr subnet, struct iaddr mask)
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{
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struct iaddr rv;
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int i;
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if (subnet.len != mask.len) {
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rv.len = 0;
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return (rv);
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}
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for (i = 0; i < subnet.len; i++)
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rv.iabuf[i] = subnet.iabuf[i] | (~mask.iabuf[i] & 255);
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rv.len = subnet.len;
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return (rv);
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}
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int
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addr_eq(struct iaddr addr1, struct iaddr addr2)
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{
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if (addr1.len != addr2.len)
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return (0);
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return (memcmp(addr1.iabuf, addr2.iabuf, addr1.len) == 0);
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}
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char *
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piaddr(struct iaddr addr)
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{
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static char pbuf[32];
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struct in_addr a;
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char *s;
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memcpy(&a, &(addr.iabuf), sizeof(struct in_addr));
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if (addr.len == 0)
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strlcpy(pbuf, "<null address>", sizeof(pbuf));
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else {
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s = inet_ntoa(a);
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if (s != NULL)
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strlcpy(pbuf, s, sizeof(pbuf));
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else
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strlcpy(pbuf, "<invalid address>", sizeof(pbuf));
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}
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return (pbuf);
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}
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