diff options
Diffstat (limited to 'libmisc/log.c')
| -rw-r--r-- | libmisc/log.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/libmisc/log.c b/libmisc/log.c new file mode 100644 index 0000000..eb84859 --- /dev/null +++ b/libmisc/log.c @@ -0,0 +1,116 @@ +/* + * Copyright (c) 1989 - 1994, Julianne Frances Haugh + * Copyright (c) 1996 - 1998, Marek Michałkiewicz + * Copyright (c) 2003 - 2005, Tomasz Kłoczko + * Copyright (c) 2008 , Nicolas François + * 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. The name of the copyright holders or contributors may not be used to + * endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT + * HOLDERS 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> + +#ident "$Id$" + +#include <sys/types.h> +#include <pwd.h> +#include <fcntl.h> +#include <time.h> +#include "defines.h" +#include <lastlog.h> +#include "prototypes.h" + +/* + * 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, + /*@unique@*/const char *line, + /*@unique@*/const char *host) +{ + int fd; + off_t offset; + struct lastlog newlog; + time_t ll_time; + + /* + * If the file does not exist, don't create it. + */ + + fd = open (LASTLOG_FILE, O_RDWR); + if (-1 == fd) { + return; + } + + /* + * The file is indexed by UID number. Seek to the record + * for this UID. Negative UID's will create problems, but ... + */ + + offset = (off_t) pw->pw_uid * sizeof newlog; + + if (lseek (fd, offset, SEEK_SET) != offset) { + SYSLOG ((LOG_WARN, + "Can't read last lastlog entry for UID %lu in %s. Entry not updated.", + (unsigned long) pw->pw_uid, LASTLOG_FILE)); + (void) 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, (void *) &newlog, sizeof newlog) != (ssize_t) sizeof newlog) { + memzero (&newlog, sizeof newlog); + } + if (NULL != ll) { + *ll = newlog; + } + + ll_time = newlog.ll_time; + (void) time (&ll_time); + newlog.ll_time = ll_time; + 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, (const void *) &newlog, sizeof newlog) != (ssize_t) sizeof newlog) + || (close (fd) != 0)) { + SYSLOG ((LOG_WARN, + "Can't write lastlog entry for UID %lu in %s.", + (unsigned long) pw->pw_uid, LASTLOG_FILE)); + (void) close (fd); + } +} + |