NetBSD/lib/libwrap/fix_options.c

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/* $NetBSD: fix_options.c,v 1.3 1997/10/09 21:20:26 christos Exp $ */
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/*
* Routine to disable IP-level socket options. This code was taken from 4.4BSD
* rlogind source, but all mistakes in it are my fault.
*
* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
*/
#include <sys/cdefs.h>
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#ifndef lint
#if 0
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static char sccsid[] = "@(#) fix_options.c 1.3 94/12/28 17:42:22";
#else
__RCSID("$NetBSD: fix_options.c,v 1.3 1997/10/09 21:20:26 christos Exp $");
#endif
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#endif
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
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#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <syslog.h>
#include <stdlib.h>
#include <unistd.h>
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#include "tcpd.h"
/* fix_options - get rid of IP-level socket options */
void
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fix_options(request)
struct request_info *request;
{
#ifdef IP_OPTIONS
unsigned char optbuf[BUFSIZ / 3], *cp;
char lbuf[BUFSIZ], *lp;
int optsize = sizeof(optbuf), ipproto;
struct protoent *ip;
int fd = request->fd;
int len = sizeof lbuf;
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if ((ip = getprotobyname("ip")) != 0)
ipproto = ip->p_proto;
else
ipproto = IPPROTO_IP;
if (getsockopt(fd, ipproto, IP_OPTIONS, (char *) optbuf, &optsize) == 0
&& optsize != 0) {
lp = lbuf;
for (cp = optbuf; optsize > 0; cp++, optsize--, lp += 3)
len -= snprintf(lp, len, " %2.2x", *cp);
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syslog(LOG_NOTICE,
"connect from %s with IP options (ignored):%s",
eval_client(request), lbuf);
if (setsockopt(fd, ipproto, IP_OPTIONS, (char *) 0, optsize) != 0) {
syslog(LOG_ERR, "setsockopt IP_OPTIONS NULL: %m");
clean_exit(request);
}
}
#endif
}