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/*
* Copyright (c) 2002-2009 BalaBit IT Ltd, Budapest, Hungary
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* Note that this permission is granted for only version 2 of the GPL.
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "afuser.h"
#include "alarms.h"
#include "messages.h"
#include <utmp.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#ifndef HAVE_GETUTENT
#include "utils.h"
#endif
typedef struct _AFUserDestDriver
{
LogDriver super;
GString *username;
time_t disable_until;
} AFUserDestDriver;
static gboolean
afuser_dd_init(LogPipe *s)
{
return TRUE;
}
static gboolean
afuser_dd_deinit(LogPipe *s)
{
return TRUE;
}
static void
afuser_dd_queue(LogPipe *s, LogMessage *msg, const LogPathOptions *path_options)
{
AFUserDestDriver *self = (AFUserDestDriver *) s;
gchar buf[8192];
struct utmp *ut;
GString *timestamp;
time_t now;
now = msg->timestamps[LM_TS_RECVD].time.tv_sec;
if (self->disable_until && self->disable_until > now)
goto finish;
timestamp = g_string_sized_new(0);
log_stamp_format(&msg->timestamps[LM_TS_STAMP], timestamp, TS_FMT_FULL, -1, 0);
g_snprintf(buf, sizeof(buf), "%s %s %s\n",
timestamp->str,
log_msg_get_value(msg, LM_V_HOST, NULL),
log_msg_get_value(msg, LM_V_MESSAGE, NULL));
g_string_free(timestamp, TRUE);
/* NOTE: there's a private implementations of getutent in utils.c on Systems which do not provide one. */
while ((ut = getutent()))
{
#if HAVE_MODERN_UTMP
if (ut->ut_type == USER_PROCESS &&
((self->username->len == 1 &&
self->username->str[0] == '*') ||
(self->username->len <= sizeof(ut->ut_user) &&
memcmp(self->username->str, ut->ut_user, self->username->len) == 0)))
#else
if ((self->username->len == 1 &&
self->username->str[0] == '*') ||
(self->username->len <= sizeof(ut->ut_name) &&
memcmp(self->username->str, ut->ut_name, self->username->len) == 0))
#endif
{
gchar line[128];
gchar *p = line;
int fd;
if (ut->ut_line[0] != '/')
{
strcpy(line, "/dev/");
p = line + 5;
}
else
line[0] = 0;
strncpy(p, ut->ut_line, sizeof(line) - (p - line));
fd = open(line, O_NOCTTY | O_APPEND | O_WRONLY | O_NONBLOCK);
if (fd != -1)
{
alarm_set(10);
if (write(fd, buf, strlen(buf)) < 0 && errno == EINTR && alarm_has_fired())
{
msg_notice("Writing to the user terminal has blocked for 10 seconds, disabling for 10 minutes",
evt_tag_str("user", self->username->str),
NULL);
self->disable_until = now + 600;
}
alarm_cancel();
close(fd);
}
}
}
endutent();
finish:
log_msg_ack(msg, path_options);
log_msg_unref(msg);
}
LogDriver *
afuser_dd_new(gchar *user)
{
AFUserDestDriver *self = g_new0(AFUserDestDriver, 1);
log_drv_init_instance(&self->super);
self->super.super.init = afuser_dd_init;
self->super.super.deinit = afuser_dd_deinit;
self->super.super.queue = afuser_dd_queue;
self->username = g_string_new(user);
return &self->super;
}
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