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/* inet.c
Subroutines to manipulate internet addresses in a safely portable
way... */
/*
* Copyright (c) 2004-2005 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1995-2003 by Internet Software Consortium
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Internet Systems Consortium, Inc.
* 950 Charter Street
* Redwood City, CA 94063
* <info@isc.org>
* http://www.isc.org/
*
* This software has been written for Internet Systems Consortium
* by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
* To learn more about Internet Systems Consortium, see
* ``http://www.isc.org/''. To learn more about Vixie Enterprises,
* see ``http://www.vix.com''. To learn more about Nominum, Inc., see
* ``http://www.nominum.com''.
*/
#ifndef lint
static char copyright[] =
"$Id: inet.c,v 1.10 2005/03/17 20:14:58 dhankins Exp $ Copyright (c) 2004-2005 Internet Systems Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
/* Return just the network number of an internet address... */
struct iaddr subnet_number (addr, mask)
struct iaddr addr;
struct iaddr mask;
{
int i;
struct iaddr rv;
if (addr.len > sizeof(addr.iabuf))
log_fatal("subnet_number():%s:%d: Invalid addr length.", MDL);
if (addr.len != mask.len)
log_fatal("subnet_number():%s:%d: Addr/mask length mismatch.",
MDL);
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;
}
/* Combine a network number and a integer to produce an internet address.
This won't work for subnets with more than 32 bits of host address, but
maybe this isn't a problem. */
struct iaddr ip_addr (subnet, mask, host_address)
struct iaddr subnet;
struct iaddr mask;
u_int32_t host_address;
{
int i, j, k;
u_int32_t swaddr;
struct iaddr rv;
unsigned char habuf [sizeof swaddr];
if (subnet.len > sizeof(subnet.iabuf))
log_fatal("ip_addr():%s:%d: Invalid addr length.", MDL);
if (subnet.len != mask.len)
log_fatal("ip_addr():%s:%d: Addr/mask length mismatch.",
MDL);
swaddr = htonl (host_address);
memcpy (habuf, &swaddr, sizeof swaddr);
/* Combine the subnet address and the host address. If
the host address is bigger than can fit in the subnet,
return a zero-length iaddr structure. */
rv = subnet;
j = rv.len - sizeof habuf;
for (i = sizeof habuf - 1; i >= 0; i--) {
if (mask.iabuf [i + j]) {
if (habuf [i] > (mask.iabuf [i + j] ^ 0xFF)) {
rv.len = 0;
return rv;
}
for (k = i - 1; k >= 0; k--) {
if (habuf [k]) {
rv.len = 0;
return rv;
}
}
rv.iabuf [i + j] |= habuf [i];
break;
} else
rv.iabuf [i + j] = habuf [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 (subnet, mask)
struct iaddr subnet;
struct iaddr mask;
{
int i, j, k;
struct iaddr rv;
if (subnet.len > sizeof(subnet.iabuf))
log_fatal("broadcast_addr():%s:%d: Invalid addr length.", MDL);
if (subnet.len != mask.len)
log_fatal("broadcast_addr():%s:%d: Addr/mask length mismatch.",
MDL);
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;
}
u_int32_t host_addr (addr, mask)
struct iaddr addr;
struct iaddr mask;
{
int i;
u_int32_t swaddr;
struct iaddr rv;
if (addr.len > sizeof(addr.iabuf))
log_fatal("host_addr():%s:%d: Invalid addr length.", MDL);
if (addr.len != mask.len)
log_fatal("host_addr():%s:%d: Addr/mask length mismatch.",
MDL);
rv.len = 0;
/* Mask out the network bits... */
rv.len = addr.len;
for (i = 0; i < rv.len; i++)
rv.iabuf [i] = addr.iabuf [i] & ~mask.iabuf [i];
/* Copy out up to 32 bits... */
memcpy (&swaddr, &rv.iabuf [rv.len - sizeof swaddr], sizeof swaddr);
/* Swap it and return it. */
return ntohl (swaddr);
}
int addr_eq (addr1, addr2)
struct iaddr addr1, addr2;
{
if (addr1.len > sizeof(addr1.iabuf))
log_fatal("addr_eq():%s:%d: Invalid addr length.", MDL);
if (addr1.len != addr2.len)
return 0;
return memcmp (addr1.iabuf, addr2.iabuf, addr1.len) == 0;
}
char *piaddr (addr)
struct iaddr addr;
{
static char pbuf [4 * 16];
char *s = pbuf;
int i;
if (addr.len > sizeof(addr.iabuf))
log_fatal("piaddr():%s:%d: Address length too long.", MDL);
if (addr.len == 0) {
strcpy (s, "<null address>");
}
for (i = 0; i < addr.len; i++) {
sprintf (s, "%s%d", i ? "." : "", addr.iabuf [i]);
s += strlen (s);
}
return pbuf;
}
char *piaddrmask (struct iaddr addr, struct iaddr mask,
const char *file, int line)
{
char *s, tbuf[sizeof("255.255.255.255/32")];
int mw;
unsigned i, oct, bit;
if (addr.len != 4)
log_fatal("piaddrmask():%s:%d: Address length %d invalid",
MDL, addr.len);
if (addr.len != mask.len)
log_fatal("piaddrmask():%s:%d: Address and mask size mismatch",
MDL);
/* Determine netmask width in bits. */
for (mw = 32; mw > 0; ) {
oct = (mw - 1) / 8;
bit = 0x80 >> ((mw - 1) % 8);
if (!mask.iabuf [oct])
mw -= 8;
else if (mask.iabuf [oct] & bit)
break;
else
mw--;
}
s = tbuf;
for (i = 0 ; i <= oct ; i++) {
sprintf(s, "%s%d", i ? "." : "", addr.iabuf[i]);
s += strlen(s);
}
sprintf(s, "/%d", mw);
s = dmalloc (strlen(tbuf) + 1, file, line);
if (!s)
return s;
strcpy(s, tbuf);
return s;
}
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