Il CD di internet/CD.iso/SOURCE/N/TCPIP/NETKIT-B.05/NETKIT-B/NetKit-B-0.05/routed/af.c

C/C++ Source or Header | 1994-05-23 | 4.6 KB | 181 lines

/*
 * 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[] = "from: @(#)af.c    5.11 (Berkeley) 2/28/91";*/
static char rcsid[] = "$Id: af.c,v 1.1 1994/05/23 09:08:11 rzsfl Exp rzsfl $";
#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;
#ifndef __linux__
    if (sin->sin_len == 0)
        sin->sin_len = sizeof (*sin);
#endif
    flags = 0;
    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);

#undef    IN_EXPERIMENTAL
#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);
#ifndef __linux__
    for (i = 0; i < sizeof(sin->sin_zero)/sizeof(sin->sin_zero[0]); i++)
        if (sin->sin_zero[i])
            return (0);
#endif
    return (1);
}

inet_canon(sin)
    struct sockaddr_in *sin;
{

    sin->sin_port = 0;
#ifndef __linux__
    sin->sin_len = sizeof(*sin);
#endif
}

char *
inet_format(sin)
    struct sockaddr_in *sin;
{
    char *inet_ntoa();

    return (inet_ntoa(sin->sin_addr));
}