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/*
* 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.
*/
/*
* From: @(#)af.c 5.11 (Berkeley) 2/28/91
* From: @(#)af.c 8.1 (Berkeley) 6/5/93
*/
char af_rcsid[] =
"$Id: af.c,v 1.5 1996/11/25 16:54:04 dholland Exp $";
#include "defs.h"
/*
* Address family support routines
*/
void inet_canon(struct sockaddr *);
int inet_checkhost(struct sockaddr *);
char *inet_format(struct sockaddr *, char *, size_t);
void inet_hash(struct sockaddr *, struct afhash *);
int inet_netmatch(struct sockaddr *, struct sockaddr *);
int inet_portcheck(struct sockaddr *);
int inet_portmatch(struct sockaddr *);
void inet_output(int, int, struct sockaddr *, int);
#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 =
{
AF_INET, INADDR_ANY
};
void inet_hash(struct sockaddr *sa, struct afhash *hp)
{
struct sockaddr_in *sin=(struct sockaddr_in *)sa;
u_long n;
n = inet_netof_subnet(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;
}
int inet_netmatch(struct sockaddr *sa1, struct sockaddr *sa2)
{
struct sockaddr_in *sin1=(struct sockaddr_in *)sa1;
struct sockaddr_in *sin2=(struct sockaddr_in *)sa2;
return (inet_netof_subnet(sin1->sin_addr) ==
inet_netof_subnet(sin2->sin_addr));
}
/*
* Verify the message is from the right port.
*/
int inet_portmatch(struct sockaddr *sa)
{
struct sockaddr_in *sin=(struct sockaddr_in *)sa;
return (sin->sin_port == sp->s_port);
}
/*
* Verify the message is from a "trusted" port.
*/
int inet_portcheck(struct sockaddr *sa)
{
struct sockaddr_in *sin=(struct sockaddr_in *)sa;
return (ntohs(sin->sin_port) <= IPPORT_RESERVED);
}
/*
* Internet output routine.
*/
void inet_output(int s, int flags, struct sockaddr *sa, int size)
{
struct sockaddr_in *sin=(struct sockaddr_in *)sa;
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,
(struct sockaddr *)sin, sizeof (*sin)) < 0)
perror("sendto");
}
/*
* Return 1 if the address is believed
* for an Internet host -- THIS IS A KLUDGE.
*/
int inet_checkhost(struct sockaddr *sa)
{
struct sockaddr_in *sin=(struct sockaddr_in *)sa;
u_long i = ntohl(sin->sin_addr.s_addr);
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);
}
void inet_canon(struct sockaddr *sa)
{
struct sockaddr_in *sin=(struct sockaddr_in *)sa;
sin->sin_port = 0;
}
char *inet_format(struct sockaddr *sa, char *buf, size_t sz)
{
struct sockaddr_in *sin=(struct sockaddr_in *)sa;
strncpy(buf, inet_ntoa(sin->sin_addr), sz);
buf[sz - 1] = '\0';
return (buf);
}
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