[unix-history] / usr / src / sbin / routed / af.c

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
static char sccsid[] = "@(#)af.c        5.2 (Berkeley) %G%";
#endif not lint

#include "defs.h"

/*
* Address family support routines
*/
int     null_hash(), null_netmatch(), null_output(),
       null_portmatch(), null_portcheck(),
       null_checkhost(), null_ishost(), null_canon();
int     inet_hash(), inet_netmatch(), inet_output(),
       inet_portmatch(), inet_portcheck(),
       inet_checkhost(), inet_ishost(), inet_canon();
#define NIL \
       { null_hash,            null_netmatch,          null_output, \
         null_portmatch,       null_portcheck,         null_checkhost, \
         null_ishost,          null_canon }
#define INET \
       { inet_hash,            inet_netmatch,          inet_output, \
         inet_portmatch,       inet_portcheck,         inet_checkhost, \
         inet_ishost,          inet_canon }

struct afswitch afswitch[AF_MAX] =
       { NIL, NIL, INET, INET, NIL, NIL, NIL, NIL, NIL, NIL, NIL };

struct sockaddr_in inet_default = { 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 (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);

#define IN_BADCLASS(i)  (((long) (i) & 0xe0000000) == 0xe0000000)

       if (IN_BADCLASS(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);
}

/*
* Return 1 if the address is
* for an Internet host, 0 for a network.
*/
inet_ishost(sin)
       struct sockaddr_in *sin;
{

       return (inet_lnaof(sin->sin_addr) != 0);
}

inet_canon(sin)
       struct sockaddr_in *sin;
{

       sin->sin_port = 0;
}

/*ARGSUSED*/
null_hash(addr, hp)
       struct sockaddr *addr;
       struct afhash *hp;
{

       hp->afh_nethash = hp->afh_hosthash = 0;
}

/*ARGSUSED*/
null_netmatch(a1, a2)
       struct sockaddr *a1, *a2;
{

       return (0);
}

/*ARGSUSED*/
null_output(s, f, a1, n)
       int s, f;
       struct sockaddr *a1;
       int n;
{

       ;
}

/*ARGSUSED*/
null_portmatch(a1)
       struct sockaddr *a1;
{

       return (0);
}

/*ARGSUSED*/
null_portcheck(a1)
       struct sockaddr *a1;
{

       return (0);
}

/*ARGSUSED*/
null_ishost(a1)
       struct sockaddr *a1;
{

       return (0);
}

/*ARGSUSED*/
null_checkhost(a1)
       struct sockaddr *a1;
{

       return (0);
}

/*ARGSUSED*/
null_canon(a1)
       struct sockaddr *a1;
{

       ;
}