BSD 4_3_Net_2 release

[unix-history] / usr / 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, 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        5.11 (Berkeley) 2/28/91";
#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));
}