libexec/ftpd/logwtmp.c

   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  * @(#)logwtmp.c        8.1 (Berkeley) 6/4/93
  34  * $FreeBSD: src/libexec/ftpd/logwtmp.c,v 1.9.2.2 2002/08/08 12:24:54 yar Exp $
  35  * $DragonFly: src/libexec/ftpd/logwtmp.c,v 1.2 2003/06/17 04:27:07 dillon Exp $
  36  */
  37
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <netinet/in.h>
  41 #include <arpa/inet.h>
  42 #include <sys/socket.h>
  43
  44 #include <fcntl.h>
  45 #include <time.h>
  46 #include <netdb.h>
  47 #include <utmp.h>
  48 #include <unistd.h>
  49 #include <stdio.h>
  50 #include <string.h>
  51 #include <libutil.h>
  52 #include "extern.h"
  53
  54 static int fd = -1;
  55
  56 /*
  57  * Modified version of logwtmp that holds wtmp file open
  58  * after first call, for use with ftp (which may chroot
  59  * after login, but before logout).
  60  */
  61 void
  62 ftpd_logwtmp(line, name, addr)
  63         char *line, *name;
  64         struct sockaddr *addr;
  65 {
  66         struct utmp ut;
  67         struct stat buf;
  68         char host[UT_HOSTSIZE];
  69
  70         if (addr == NULL)
  71                 host[0] = '\0';
  72         else
  73                 realhostname_sa(host, sizeof(host), addr, addr->sa_len);
  74
  75         if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
  76                 return;
  77         if (fstat(fd, &buf) == 0) {
  78                 (void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
  79                 (void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
  80                 (void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
  81                 (void)time(&ut.ut_time);
  82                 if (write(fd, &ut, sizeof(struct utmp)) !=
  83                     sizeof(struct utmp))
  84                         (void)ftruncate(fd, buf.st_size);
  85         }
  86 }