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logwtmp.c revision 1.3 
      1 /*
      2  * Copyright (c) 1988, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  */
     34 
     35 #ifndef lint
     36 static char sccsid[] = "@(#)logwtmp.c	8.1 (Berkeley) 6/4/93";
     37 static char rcsid[] = "$Id: logwtmp.c,v 1.3 1994/06/29 01:49:47 deraadt Exp $";
     38 #endif /* not lint */
     39 
     40 #include <sys/types.h>
     41 #include <sys/time.h>
     42 #include <sys/stat.h>
     43 
     44 #include <fcntl.h>
     45 #include <utmp.h>
     46 #include <unistd.h>
     47 #include <stdio.h>
     48 #include <string.h>
     49 #include "extern.h"
     50 
     51 static int fd = -1;
     52 
     53 /*
     54  * Modified version of logwtmp that holds wtmp file open
     55  * after first call, for use with ftp (which may chroot
     56  * after login, but before logout).
     57  */
     58 void
     59 logwtmp(line, name, host)
     60 	char *line, *name, *host;
     61 {
     62 	struct utmp ut;
     63 	struct stat buf;
     64 
     65 	if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
     66 		return;
     67 	if (fstat(fd, &buf) == 0) {
     68 		(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
     69 		(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
     70 		(void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
     71 		(void)time(&ut.ut_time);
     72 		if (write(fd, (char *)&ut, sizeof(struct utmp)) !=
     73 		    sizeof(struct utmp))
     74 			(void)ftruncate(fd, buf.st_size);
     75 	}
     76 }
     77