4.3BSD-Reno/src/sbin/routed/af.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)af.c	5.10 (Berkeley) 6/1/90";
#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, 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));
}