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      1 /*	$NetBSD: logwtmp.c,v 1.27 2015/08/09 20:34:24 shm Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  */
     32 
     33 
     34 #include <sys/cdefs.h>
     35 #ifndef lint
     36 #if 0
     37 static char sccsid[] = "@(#)logwtmp.c	8.1 (Berkeley) 6/4/93";
     38 #else
     39 __RCSID("$NetBSD: logwtmp.c,v 1.27 2015/08/09 20:34:24 shm Exp $");
     40 #endif
     41 #endif /* not lint */
     42 
     43 #include <sys/types.h>
     44 #include <sys/param.h>
     45 #include <sys/time.h>
     46 #include <sys/stat.h>
     47 #include <sys/wait.h>
     48 
     49 #include <fcntl.h>
     50 #include <signal.h>
     51 #include <stdio.h>
     52 #include <string.h>
     53 #include <time.h>
     54 #include <syslog.h>
     55 #include <unistd.h>
     56 #ifdef SUPPORT_UTMP
     57 #include <utmp.h>
     58 #endif
     59 #ifdef SUPPORT_UTMPX
     60 #include <utmpx.h>
     61 #endif
     62 #include <util.h>
     63 
     64 #ifdef KERBEROS5
     65 #include <krb5/krb5.h>
     66 #endif
     67 
     68 #include "extern.h"
     69 
     70 #ifdef SUPPORT_UTMP
     71 static int fd = -1;
     72 
     73 void
     74 ftpd_initwtmp(void)
     75 {
     76 	const char *wf = _PATH_WTMP;
     77 	if ((fd = open(wf, O_WRONLY|O_APPEND, 0)) == -1)
     78 		syslog(LOG_ERR, "Cannot open `%s' (%m)", wf);
     79 }
     80 
     81 /*
     82  * Modified version of logwtmp that holds wtmp file open
     83  * after first call, for use with ftp (which may chroot
     84  * after login, but before logout).
     85  */
     86 void
     87 ftpd_logwtmp(const char *line, const char *name, const char *host)
     88 {
     89 	struct utmp ut;
     90 	struct stat buf;
     91 
     92 	if (fd < 0)
     93 		return;
     94 	if (fstat(fd, &buf) == 0) {
     95 		(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
     96 		(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
     97 		(void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
     98 		(void)time(&ut.ut_time);
     99 		if (write(fd, (char *)&ut, sizeof(struct utmp)) !=
    100 		    sizeof(struct utmp))
    101 			(void)ftruncate(fd, buf.st_size);
    102 	}
    103 }
    104 #endif
    105 
    106 #ifdef SUPPORT_UTMPX
    107 static int fdx = -1;
    108 
    109 void
    110 ftpd_initwtmpx(void)
    111 {
    112 	const char *wf = _PATH_WTMPX;
    113 	if ((fdx = open(wf, O_WRONLY|O_APPEND, 0)) == -1)
    114 		syslog(LOG_ERR, "Cannot open `%s' (%m)", wf);
    115 }
    116 
    117 void
    118 ftpd_logwtmpx(const char *line, const char *name, const char *host,
    119     struct sockinet *haddr, int status, int utx_type)
    120 {
    121 	struct utmpx ut;
    122 	struct stat buf;
    123 
    124 	if (fdx < 0)
    125 		return;
    126 	if (fstat(fdx, &buf) == 0) {
    127 		(void)memset(&ut, 0, sizeof(ut));
    128 		(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
    129 		(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
    130 		(void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
    131 		if (haddr)
    132 			(void)memcpy(&ut.ut_ss, &haddr->si_su, haddr->su_len);
    133 		ut.ut_type = utx_type;
    134 		if (WIFEXITED(status))
    135 			ut.ut_exit.e_exit = (uint16_t)WEXITSTATUS(status);
    136 		if (WIFSIGNALED(status))
    137 		ut.ut_exit.e_termination = (uint16_t)WTERMSIG(status);
    138 		(void)gettimeofday(&ut.ut_tv, NULL);
    139 		if(write(fdx, (char *)&ut, sizeof(struct utmpx)) !=
    140 		    sizeof(struct utmpx))
    141 			(void)ftruncate(fdx, buf.st_size);
    142 	}
    143 }
    144 #endif
    145