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