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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2006 Ray Strode <rstrode@redhat.com>
* Copyright (C) 2007 William Jon McCann <mccann@jhu.edu>
*
* This program 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 2, or (at your option)
* any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if defined(HAVE_UTMPX_H)
#include <utmpx.h>
#endif
#if defined(HAVE_UTMP_H)
#include <utmp.h>
#endif
#include <glib.h>
#include <glib/gi18n.h>
#include <glib/gstdio.h>
#include "gdm-session-record.h"
#ifndef GDM_BAD_SESSION_RECORDS_FILE
#define GDM_BAD_SESSION_RECORDS_FILE "/var/log/btmp"
#endif
#if !defined(GDM_NEW_SESSION_RECORDS_FILE)
# if defined(WTMPX_FILE)
# define GDM_NEW_SESSION_RECORDS_FILE WTMPX_FILE
# elif defined(_PATH_WTMPX)
# define GDM_NEW_SESSION_RECORDS_FILE _PATH_WTMPX
# elif defined(WTMPX_FILENAME)
# define GDM_NEW_SESSION_RECORDS_FILE WTMPX_FILENAME
# elif defined(WTMP_FILE)
# define GDM_NEW_SESSION_RECORDS_FILE WTMP_FILE
# elif defined(_PATH_WTMP) /* BSD systems */
# define GDM_NEW_SESSION_RECORDS_FILE _PATH_WTMP
# else
# define GDM_NEW_SESSION_RECORDS_FILE "/var/log/wtmp"
# endif
#endif
static void
record_set_username (UTMP *u,
const char *username)
{
#if defined(HAVE_UT_UT_USER)
memccpy (u->ut_user, username, '\0', sizeof (u->ut_user));
g_debug ("using ut_user %.*s",
(int) sizeof (u->ut_user),
u->ut_user);
#elif defined(HAVE_UT_UT_NAME)
memccpy (u->ut_name, username, '\0', sizeof (u->ut_name));
g_debug ("using ut_name %.*s",
(int) sizeof (u->ut_name),
u->ut_name);
#endif
}
static void
record_set_timestamp (UTMP *u)
{
#if defined(HAVE_UT_UT_TV)
gint64 now;
/* Set time in TV format */
now = g_get_real_time();
u->ut_tv.tv_sec = now / G_USEC_PER_SEC;
u->ut_tv.tv_usec = now % G_USEC_PER_SEC;
g_debug ("using ut_tv time %ld",
(glong) u->ut_tv.tv_sec);
#elif defined(HAVE_UT_UT_TIME)
/* Set time in time format */
time (&u->ut_time);
g_debug ("using ut_time %ld",
(glong) u->ut_time);
#endif
}
static void
record_set_pid (UTMP *u,
GPid pid)
{
#if defined(HAVE_UT_UT_PID)
/* Set pid */
if (pid != 0) {
u->ut_pid = pid;
}
g_debug ("using ut_pid %d", (int) u->ut_pid);
#endif
}
static void
record_set_host (UTMP *u,
const char *x11_display_name,
const char *host_name)
{
g_autofree char *hostname = NULL;
#if defined(HAVE_UT_UT_HOST)
/*
* Set ut_host to hostname:$DISPLAY if remote, otherwise set
* to $DISPLAY
*/
if (host_name != NULL
&& x11_display_name != NULL
&& g_str_has_prefix (x11_display_name, ":")) {
hostname = g_strdup_printf ("%s%s", host_name, x11_display_name);
} else {
hostname = g_strdup (x11_display_name);
}
if (hostname != NULL) {
memccpy (u->ut_host, hostname, '\0', sizeof (u->ut_host));
g_debug ("using ut_host %.*s", (int) sizeof (u->ut_host), u->ut_host);
#ifdef HAVE_UT_UT_SYSLEN
u->ut_syslen = MIN (strlen (hostname), sizeof (u->ut_host));
#endif
}
#endif
}
static void
record_set_line (UTMP *u,
const char *display_device,
const char *x11_display_name)
{
/*
* Set ut_line to the device name associated with this display
* but remove the "/dev/" prefix if there is one. Otherwise, if it
* seems like the display device is a seat id, just use it wholesale.
* If there's no device at all, but $DISPLAY is set, just fall back to
* using that.
*/
if (display_device != NULL && g_str_has_prefix (display_device, "/dev/")) {
memccpy (u->ut_line,
display_device + strlen ("/dev/"),
'\0',
sizeof (u->ut_line));
} else if (display_device != NULL && g_str_has_prefix (display_device, "seat")) {
memccpy (u->ut_line,
display_device,
'\0',
sizeof (u->ut_line));
} else if (x11_display_name != NULL) {
memccpy (u->ut_line,
x11_display_name,
'\0',
sizeof (u->ut_line));
}
g_debug ("using ut_line %.*s", (int) sizeof (u->ut_line), u->ut_line);
}
void
gdm_session_record_login (GPid session_pid,
const char *user_name,
const char *host_name,
const char *x11_display_name,
const char *display_device)
{
UTMP session_record = { 0 };
if (x11_display_name == NULL)
x11_display_name = display_device;
record_set_username (&session_record, user_name);
g_debug ("Writing login record");
#if defined(HAVE_UT_UT_TYPE)
session_record.ut_type = USER_PROCESS;
g_debug ("using ut_type USER_PROCESS");
#endif
record_set_timestamp (&session_record);
record_set_pid (&session_record, session_pid);
record_set_host (&session_record, x11_display_name, host_name);
record_set_line (&session_record, display_device, x11_display_name);
/* Handle wtmp */
g_debug ("Writing wtmp session record to " GDM_NEW_SESSION_RECORDS_FILE);
#if defined(HAVE_UPDWTMPX)
updwtmpx (GDM_NEW_SESSION_RECORDS_FILE, &session_record);
#elif defined(HAVE_UPDWTMP)
updwtmp (GDM_NEW_SESSION_RECORDS_FILE, &session_record);
#elif defined(HAVE_LOGWTMP) && defined(HAVE_UT_UT_HOST)
#if defined(HAVE_UT_UT_USER)
logwtmp (session_record.ut_line, session_record.ut_user, session_record.ut_host);
#elif defined(HAVE_UT_UT_NAME)
logwtmp (session_record.ut_line, session_record.ut_name, session_record.ut_host);
#endif
#endif
/* Handle utmp */
#if defined(HAVE_GETUTXENT)
g_debug ("Adding or updating utmp record for login");
setutxent();
pututxline (&session_record);
endutxent();
#elif defined(HAVE_LOGIN)
login (&session_record);
#endif
}
void
gdm_session_record_logout (GPid session_pid,
const char *user_name,
const char *host_name,
const char *x11_display_name,
const char *display_device)
{
UTMP session_record = { 0 };
if (x11_display_name == NULL)
x11_display_name = display_device;
g_debug ("Writing logout record");
#if defined(HAVE_UT_UT_TYPE)
session_record.ut_type = DEAD_PROCESS;
g_debug ("using ut_type DEAD_PROCESS");
#endif
record_set_timestamp (&session_record);
record_set_pid (&session_record, session_pid);
record_set_host (&session_record, x11_display_name, host_name);
record_set_line (&session_record, display_device, x11_display_name);
/* Handle wtmp */
g_debug ("Writing wtmp logout record to " GDM_NEW_SESSION_RECORDS_FILE);
#if defined(HAVE_UPDWTMPX)
updwtmpx (GDM_NEW_SESSION_RECORDS_FILE, &session_record);
#elif defined (HAVE_UPDWTMP)
updwtmp (GDM_NEW_SESSION_RECORDS_FILE, &session_record);
#elif defined(HAVE_LOGWTMP)
logwtmp (session_record.ut_line, "", "");
#endif
/* Handle utmp */
#if defined(HAVE_GETUTXENT)
g_debug ("Adding or updating utmp record for logout");
setutxent();
pututxline (&session_record);
endutxent();
#elif defined(HAVE_LOGOUT)
logout (session_record.ut_line);
#endif
}
void
gdm_session_record_failed (GPid session_pid,
const char *user_name,
const char *host_name,
const char *x11_display_name,
const char *display_device)
{
UTMP session_record = { 0 };
if (x11_display_name == NULL)
x11_display_name = display_device;
record_set_username (&session_record, user_name);
g_debug ("Writing failed session attempt record");
#if defined(HAVE_UT_UT_TYPE)
session_record.ut_type = USER_PROCESS;
g_debug ("using ut_type USER_PROCESS");
#endif
record_set_timestamp (&session_record);
record_set_pid (&session_record, session_pid);
record_set_host (&session_record, x11_display_name, host_name);
record_set_line (&session_record, display_device, x11_display_name);
#if defined(HAVE_UPDWTMPX) || defined(HAVE_UPDWTMP)
/* Handle btmp */
g_debug ("Writing btmp failed session attempt record to "
GDM_BAD_SESSION_RECORDS_FILE);
#endif
#if defined(HAVE_UPDWTMPX)
updwtmpx (GDM_BAD_SESSION_RECORDS_FILE, &session_record);
#elif defined(HAVE_UPDWTMP)
updwtmp(GDM_BAD_SESSION_RECORDS_FILE, &session_record);
#endif
}
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