ftpd/logwtmp.c - master - niceSOFT/inetutils

ftpd/logwtmp.c
138 строк4 KB
Simon Josefsson
maint: Run 'make update-copyright'
20 янв 2026, 11:50
20 янв 2026, 11:501ce61cd
/*
  Copyright (C) 1996-2026 Free Software Foundation, Inc.

  This file is part of GNU Inetutils.

  GNU Inetutils is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or (at
  your option) any later version.

  GNU Inetutils is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see `http://www.gnu.org/licenses/'. */

/*
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <config.h>

#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>

#include <fcntl.h>
#include <utmp.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include "extern.h"

#if !defined _PATH_WTMP && defined WTMP_FILE
# define _PATH_WTMP WTMP_FILE
#endif

/*
 * Modified version of logwtmp that holds wtmp file open
 * after first call, for use with ftp (which may chroot
 * after login, but before logout).
 */
void
logwtmp (const char *line, const char *name, const char *host)
{
  struct utmp ut;
#if _HAVE_UT_TV - 0
  struct timeval tv;
#endif

  /* Set information in new entry.  */
  memset (&ut, 0, sizeof (ut));
#if _HAVE_UT_TYPE - 0
  ut.ut_type = USER_PROCESS;
#endif
  strncpy (ut.ut_line, line, sizeof ut.ut_line);
  strncpy (ut.ut_name, name, sizeof ut.ut_name);
#if _HAVE_UT_HOST - 0
  strncpy (ut.ut_host, host, sizeof ut.ut_host);
#endif

#if _HAVE_UT_TV - 0
  gettimeofday (&tv, NULL);
  ut.ut_tv.tv_sec = tv.tv_sec;
  ut.ut_tv.tv_usec = tv.tv_usec;
#else
  time (&ut.ut_time);
#endif

#if defined HAVE_UTMPNAME && defined HAVE_SETUTENT_R
  /* XXX I think frobbing the details of DATA is GNU libc specific.  */
  {
    static struct utmp_data data = { -1 };

    if (data.ut_fd < 0)
      /* Open the file.  */
      {
	/* Tell that we want to use the WTMP file.  */
	if (utmpname (_PATH_WTMP) == 0)
	  return;

	/* Open WTMP file.  */
	setutent_r (&data);
      }

    /* Position at end of file.  */
    data.loc_utmp = lseek (data.ut_fd, 0, SEEK_END);
    if (data.loc_utmp == -1)
      return;

    /* Write the entry.  */
    pututline_r (&ut, &data);
  }
#else
  /* Do things the old way.  */
  {
    struct utmp ut;
    struct stat buf;
    static int fd = -1;

    if (fd < 0 && (fd = open (_PATH_WTMP, O_WRONLY | O_APPEND, 0)) < 0)
      return;
    if (fstat (fd, &buf) == 0)
      {
	if (write (fd, (char *) &ut, sizeof (struct utmp)) !=
	    sizeof (struct utmp))
	  ftruncate (fd, buf.st_size);
      }
  }
#endif
}