freebsd-dev/usr.sbin/routed/af.c
1995-05-30 03:57:47 +00:00

172 lines
4.4 KiB
C

/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*/
#ifndef lint
static char sccsid[] = "@(#)af.c 8.1 (Berkeley) 6/5/93";
#endif /* not lint */
#include "defs.h"
/*
* Address family support routines
*/
int inet_hash(), inet_netmatch(), inet_output(),
inet_portmatch(), inet_portcheck(),
inet_checkhost(), inet_rtflags(), inet_sendroute(), inet_canon();
char *inet_format();
#define NIL { 0 }
#define INET \
{ inet_hash, inet_netmatch, inet_output, \
inet_portmatch, inet_portcheck, inet_checkhost, \
inet_rtflags, inet_sendroute, inet_canon, \
inet_format \
}
struct afswitch afswitch[AF_MAX] = {
NIL, /* 0- unused */
NIL, /* 1- Unix domain, unused */
INET, /* Internet */
};
int af_max = sizeof(afswitch) / sizeof(afswitch[0]);
struct sockaddr_in inet_default = {
#ifdef RTM_ADD
sizeof (inet_default),
#endif
AF_INET, INADDR_ANY };
inet_hash(sin, hp)
register struct sockaddr_in *sin;
struct afhash *hp;
{
register u_long n;
n = inet_netof(sin->sin_addr);
if (n)
while ((n & 0xff) == 0)
n >>= 8;
hp->afh_nethash = n;
hp->afh_hosthash = ntohl(sin->sin_addr.s_addr);
hp->afh_hosthash &= 0x7fffffff;
}
inet_netmatch(sin1, sin2)
struct sockaddr_in *sin1, *sin2;
{
return (inet_netof(sin1->sin_addr) == inet_netof(sin2->sin_addr));
}
/*
* Verify the message is from the right port.
*/
inet_portmatch(sin)
register struct sockaddr_in *sin;
{
return (sin->sin_port == sp->s_port);
}
/*
* Verify the message is from a "trusted" port.
*/
inet_portcheck(sin)
struct sockaddr_in *sin;
{
return (ntohs(sin->sin_port) <= IPPORT_RESERVED);
}
/*
* Internet output routine.
*/
inet_output(s, flags, sin, size)
int s, flags;
struct sockaddr_in *sin;
int size;
{
struct sockaddr_in dst;
dst = *sin;
sin = &dst;
if (sin->sin_port == 0)
sin->sin_port = sp->s_port;
if (sin->sin_len == 0)
sin->sin_len = sizeof (*sin);
if (sendto(s, packet, size, flags,
(struct sockaddr *)sin, sizeof (*sin)) < 0)
perror("sendto");
}
/*
* Return 1 if the address is believed
* for an Internet host -- THIS IS A KLUDGE.
*/
inet_checkhost(sin)
struct sockaddr_in *sin;
{
u_long i = ntohl(sin->sin_addr.s_addr);
#ifndef IN_EXPERIMENTAL
#define IN_EXPERIMENTAL(i) (((long) (i) & 0xe0000000) == 0xe0000000)
#endif
if (IN_EXPERIMENTAL(i) || sin->sin_port != 0)
return (0);
if (i != 0 && (i & 0xff000000) == 0)
return (0);
for (i = 0; i < sizeof(sin->sin_zero)/sizeof(sin->sin_zero[0]); i++)
if (sin->sin_zero[i])
return (0);
return (1);
}
inet_canon(sin)
struct sockaddr_in *sin;
{
sin->sin_port = 0;
sin->sin_len = sizeof(*sin);
}
char *
inet_format(sin)
struct sockaddr_in *sin;
{
char *inet_ntoa();
return (inet_ntoa(sin->sin_addr));
}