ce30dfe255
We've recently fixed several bugs in the calculation of the size in this function call. Use this wrapper to prevent similar mistakes in the future. Signed-off-by: Alejandro Colomar <alx@kernel.org>
98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/*
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* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2008 , Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id$"
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#include <sys/types.h>
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#include <pwd.h>
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#include <fcntl.h>
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#include <time.h>
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#include "defines.h"
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#include <lastlog.h>
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#include "memzero.h"
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#include "prototypes.h"
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#include "strncpy.h"
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#include "strtcpy.h"
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/*
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* dolastlog - create lastlog entry
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*
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* A "last login" entry is created for the user being logged in. The
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* UID is extracted from the global (struct passwd) entry and the
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* TTY information is gotten from the (struct utmp).
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*/
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void dolastlog (
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struct lastlog *ll,
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const struct passwd *pw,
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/*@unique@*/const char *line,
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/*@unique@*/const char *host)
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{
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int fd;
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off_t offset;
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struct lastlog newlog;
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time_t ll_time;
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/*
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* If the file does not exist, don't create it.
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*/
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fd = open (LASTLOG_FILE, O_RDWR);
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if (-1 == fd) {
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return;
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}
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/*
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* The file is indexed by UID number. Seek to the record
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* for this UID. Negative UID's will create problems, but ...
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*/
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offset = (off_t) pw->pw_uid * sizeof newlog;
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if (lseek (fd, offset, SEEK_SET) != offset) {
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SYSLOG ((LOG_WARN,
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"Can't read last lastlog entry for UID %lu in %s. Entry not updated.",
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(unsigned long) pw->pw_uid, LASTLOG_FILE));
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(void) close (fd);
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return;
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}
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/*
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* Read the old entry so we can tell the user when they last
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* logged in. Then construct the new entry and write it out
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* the way we read the old one in.
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*/
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if (read (fd, &newlog, sizeof newlog) != (ssize_t) sizeof newlog) {
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memzero (&newlog, sizeof newlog);
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}
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if (NULL != ll) {
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*ll = newlog;
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}
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ll_time = newlog.ll_time;
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(void) time (&ll_time);
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newlog.ll_time = ll_time;
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STRTCPY(newlog.ll_line, line);
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#if HAVE_LL_HOST
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STRNCPY(newlog.ll_host, host);
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#endif
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if ( (lseek (fd, offset, SEEK_SET) != offset)
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|| (write_full(fd, &newlog, sizeof newlog) == -1)
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|| (close (fd) != 0)) {
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SYSLOG ((LOG_WARN,
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"Can't write lastlog entry for UID %lu in %s.",
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(unsigned long) pw->pw_uid, LASTLOG_FILE));
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(void) close (fd);
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}
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}
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