309 lines
6.8 KiB
C
309 lines
6.8 KiB
C
/*
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* Copyright 1991 - 1993, Julianne Frances Haugh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#include "rcsid.h"
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RCSID(PKG_VER "$Id: logoutd.c,v 1.16 2000/09/02 18:40:44 marekm Exp $")
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <signal.h>
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#include <utmp.h>
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#include <fcntl.h>
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#include "prototypes.h"
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#include "defines.h"
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#ifdef SVR4
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#include <libgen.h>
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#endif
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#ifdef SVR4
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#define signal sigset
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#endif
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static char *Prog;
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#ifndef DEFAULT_HUP_MESG
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#define DEFAULT_HUP_MESG "login time exceeded\r\n"
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#endif
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#ifndef HUP_MESG_FILE
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#define HUP_MESG_FILE "/etc/logoutd.mesg"
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#endif
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/* local function prototypes */
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static int check_login(const struct utmp *);
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/*
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* check_login - check if user (struct utmp) allowed to stay logged in
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*/
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static int
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check_login(const struct utmp *ut)
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{
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char user[sizeof(ut->ut_user) + 1];
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time_t now;
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/*
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* ut_user may not have the terminating NUL.
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*/
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strncpy(user, ut->ut_user, sizeof(ut->ut_user));
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user[sizeof(ut->ut_user)] = '\0';
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time(&now);
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/*
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* Check if they are allowed to be logged in right now.
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*/
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if (!isttytime(user, ut->ut_line, now))
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return 0;
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#if 0
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/*
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* Check for how long they are allowed to stay logged in.
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* XXX - not implemented yet. Need to add a new field to
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* /etc/porttime (login time limit in minutes, or no limit,
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* based on username, tty, and time of login).
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*/
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if (now - ut->ut_time > get_time_limit(user, ut->ut_line, ut->ut_time))
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return 0;
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#endif
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return 1;
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}
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static void
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send_mesg_to_tty(int tty_fd)
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{
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TERMIO oldt, newt;
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FILE *mesg_file, *tty_file;
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int c, is_tty;
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tty_file = fdopen(tty_fd, "w");
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if (!tty_file)
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return;
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is_tty = (GTTY(tty_fd, &oldt) == 0);
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if (is_tty) {
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/* Suggested by Ivan Nejgebauar <ian@unsux.ns.ac.yu>:
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set OPOST before writing the message. */
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newt = oldt;
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newt.c_oflag |= OPOST;
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STTY(tty_fd, &newt);
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}
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mesg_file = fopen(HUP_MESG_FILE, "r");
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if (mesg_file) {
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while ((c = getc(mesg_file)) != EOF) {
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if (c == '\n')
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putc('\r', tty_file);
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putc(c, tty_file);
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}
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fclose(mesg_file);
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} else {
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fputs(DEFAULT_HUP_MESG, tty_file);
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}
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fflush(tty_file);
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fclose(tty_file);
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if (is_tty) {
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STTY(tty_fd, &oldt);
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}
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}
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/*
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* logoutd - logout daemon to enforce /etc/porttime file policy
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*
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* logoutd is started at system boot time and enforces the login
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* time and port restrictions specified in /etc/porttime. The
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* utmp file is periodically scanned and offending users are logged
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* off from the system.
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*/
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int
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main(int argc, char **argv)
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{
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int i;
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int status;
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pid_t pid;
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struct utmp *ut;
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char user[sizeof(ut->ut_user) + 1]; /* terminating NUL */
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char tty_name[sizeof(ut->ut_line) + 6]; /* /dev/ + NUL */
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int tty_fd;
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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#ifndef DEBUG
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for (i = 0;close (i) == 0;i++)
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;
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#ifdef HAVE_SETPGRP
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#ifdef SETPGRP_VOID
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setpgrp(); /* USG */
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#else
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setpgrp(getpid(), getpid());
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#endif
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#else /* !HAVE_SETPGRP */
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setpgid(getpid(), getpid()); /* BSD || SUN || SUN4 */
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#endif /* !HAVE_SETPGRP */
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/*
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* Put this process in the background.
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*/
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pid = fork();
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if (pid > 0) {
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/* parent */
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exit(0);
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} else if (pid < 0) {
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/* error */
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perror("fork");
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exit(1);
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}
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#endif /* !DEBUG */
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/*
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* Start syslogging everything
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*/
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Prog = Basename(argv[0]);
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OPENLOG(Prog);
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/*
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* Scan the UTMP file once per minute looking for users that
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* are not supposed to still be logged in.
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*/
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while (1) {
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/*
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* Attempt to re-open the utmp file. The file is only
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* open while it is being used.
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*/
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setutent();
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/*
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* Read all of the entries in the utmp file. The entries
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* for login sessions will be checked to see if the user
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* is permitted to be signed on at this time.
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*/
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while ((ut = getutent())) {
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#ifdef USER_PROCESS
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if (ut->ut_type != USER_PROCESS)
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continue;
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#endif
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if (ut->ut_user[0] == '\0')
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continue;
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if (check_login(ut))
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continue;
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/*
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* Put the rest of this in a child process. This
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* keeps the scan from waiting on other ports to die.
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*/
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pid = fork();
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if (pid > 0) {
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/* parent */
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continue;
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} else if (pid < 0) {
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/* failed - give up until the next scan */
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break;
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}
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/* child */
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if (strncmp(ut->ut_line, "/dev/", 5) != 0)
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strcpy(tty_name, "/dev/");
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else
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tty_name[0] = '\0';
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strcat(tty_name, ut->ut_line);
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#ifndef O_NOCTTY
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#define O_NOCTTY 0
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#endif
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tty_fd = open(tty_name, O_WRONLY|O_NDELAY|O_NOCTTY);
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if (tty_fd != -1) {
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send_mesg_to_tty(tty_fd);
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close(tty_fd);
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sleep(10);
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}
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#ifdef USER_PROCESS /* USG_UTMP */
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if (ut->ut_pid > 1) {
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kill(- ut->ut_pid, SIGHUP);
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sleep(10);
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kill(- ut->ut_pid, SIGKILL);
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}
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#else /* BSD || SUN || SUN4 */
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/*
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* vhangup() the line to kill try and kill
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* whatever is out there using it.
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*/
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if ((tty_fd = open (tty_name, O_RDONLY|O_NDELAY)) == -1)
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continue;
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vhangup (tty_fd);
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close (tty_fd);
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#endif /* BSD || SUN || SUN4 */
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strncpy(user, ut->ut_line, sizeof(user) - 1);
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user[sizeof(user) - 1] = '\0';
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SYSLOG((LOG_NOTICE, "logged off user `%s' on `%s'\n",
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user, tty_name));
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/*
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* This child has done all it can, drop dead.
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*/
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exit (0);
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}
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endutent();
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#ifndef DEBUG
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sleep(60);
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#endif
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/*
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* Reap any dead babies ...
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*/
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while (wait (&status) != -1)
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;
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}
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return 1; /* not reached */
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}
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