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log.c

/*
 * Copyright 1989 - 1994, Julianne Frances Haugh
 * 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 Julianne F. Haugh 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 JULIE HAUGH 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 JULIE HAUGH 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 "rcsid.h"
RCSID("$Id: log.c 6 2005-03-20 15:34:28Z bubulle $")

#include <sys/types.h>
#include <pwd.h>
#include <fcntl.h>
#include <time.h>
#include "defines.h"
#if HAVE_LASTLOG_H
#include <lastlog.h>
#else
#include "lastlog_.h"
#endif

/* 
 * dolastlog - create lastlog entry
 *
 *    A "last login" entry is created for the user being logged in.  The
 *    UID is extracted from the global (struct passwd) entry and the
 *    TTY information is gotten from the (struct utmp).
 */

void
dolastlog(struct lastlog *ll, const struct passwd *pw, const char *line, const char *host)
{
      int   fd;
      off_t offset;
      struct      lastlog     newlog;

      /*
       * If the file does not exist, don't create it.
       */

      if ((fd = open(LASTLOG_FILE, O_RDWR)) == -1)
            return;

      /*
       * The file is indexed by UID number.  Seek to the record
       * for this UID.  Negative UID's will create problems, but ...
       */

      offset = (unsigned long) pw->pw_uid * sizeof newlog;

      if (lseek(fd, offset, SEEK_SET) != offset) {
            close(fd);
            return;
      }

      /*
       * Read the old entry so we can tell the user when they last
       * logged in.  Then construct the new entry and write it out
       * the way we read the old one in.
       */

      if (read(fd, (char *) &newlog, sizeof newlog) != sizeof newlog)
            memzero(&newlog, sizeof newlog);
      if (ll)
            *ll = newlog;

      newlog.ll_time = time(0);
      strncpy(newlog.ll_line, line, sizeof newlog.ll_line);
#if HAVE_LL_HOST
      strncpy(newlog.ll_host, host, sizeof newlog.ll_host);
#endif
      if (lseek(fd, offset, SEEK_SET) == offset)
            write(fd, (char *) &newlog, sizeof newlog);
      close(fd);
}


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