/* $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 "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); }