1 /* $OpenBSD: inet.c,v 1.7 2004/05/04 21:48:16 deraadt Exp $ */
4 * Subroutines to manipulate internet addresses in a safely portable
9 * SPDX-License-Identifier: BSD-3-Clause
11 * Copyright (c) 1996 The Internet Software Consortium. All rights reserved.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. Neither the name of The Internet Software Consortium nor the names
23 * of its contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
27 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
28 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
29 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
30 * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
31 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
34 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
35 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
36 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
37 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * This software has been written for the Internet Software Consortium
41 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
42 * Enterprises. To learn more about the Internet Software Consortium,
43 * see ``http://www.vix.com/isc''. To learn more about Vixie
44 * Enterprises, see ``http://www.vix.com''.
47 #include <sys/cdefs.h>
51 * Return just the network number of an internet address...
54 subnet_number(struct iaddr addr, struct iaddr mask)
61 /* Both addresses must have the same length... */
62 if (addr.len != mask.len)
66 for (i = 0; i < rv.len; i++)
67 rv.iabuf[i] = addr.iabuf[i] & mask.iabuf[i];
72 * Given a subnet number and netmask, return the address on that subnet
73 * for which the host portion of the address is all ones (the standard
77 broadcast_addr(struct iaddr subnet, struct iaddr mask)
82 if (subnet.len != mask.len) {
87 for (i = 0; i < subnet.len; i++)
88 rv.iabuf[i] = subnet.iabuf[i] | (~mask.iabuf[i] & 255);
95 addr_eq(struct iaddr addr1, struct iaddr addr2)
97 if (addr1.len != addr2.len)
99 return (memcmp(addr1.iabuf, addr2.iabuf, addr1.len) == 0);
103 piaddr(struct iaddr addr)
105 static char pbuf[32];
109 memcpy(&a, &(addr.iabuf), sizeof(struct in_addr));
112 strlcpy(pbuf, "<null address>", sizeof(pbuf));
116 strlcpy(pbuf, s, sizeof(pbuf));
118 strlcpy(pbuf, "<invalid address>", sizeof(pbuf));