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/*
* Copyright (c) 2018 Balabit
*
* 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, 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
* 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.
*
*/
#include "wildcard-file-reader.h"
#include "mainloop.h"
static gboolean
_init(LogPipe *s)
{
WildcardFileReader *self = (WildcardFileReader *)s;
self->file_state.deleted = FALSE;
self->file_state.deleted_eof = FALSE;
return file_reader_init_method(s);
}
static gboolean
_deinit(LogPipe *s)
{
WildcardFileReader *self = (WildcardFileReader *)s;
if (iv_task_registered(&self->file_state_event_handler))
{
iv_task_unregister(&self->file_state_event_handler);
}
return file_reader_deinit_method(s);
}
static void
_deleted_file_eof(FileStateEvent *self, FileReader *reader)
{
if (self && self->deleted_file_eof)
{
self->deleted_file_eof(reader, self->deleted_file_eof_user_data);
}
}
static void
_schedule_state_change_handling(WildcardFileReader *self)
{
main_loop_assert_main_thread();
if (!iv_task_registered(&self->file_state_event_handler))
{
iv_task_register(&self->file_state_event_handler);
}
}
static void
_set_eof(WildcardFileReader *self)
{
if (self->file_state.deleted)
{
self->file_state.deleted_eof = TRUE;
_schedule_state_change_handling(self);
}
}
static gboolean
_is_reader_poll_stopped(LogReader *reader)
{
return (reader == NULL || FALSE == log_reader_is_opened(reader));
}
static void
_set_deleted(WildcardFileReader *self)
{
/* File can be deleted only once,
* so there is no need for checking the state
* before we set it
*/
self->file_state.deleted = TRUE;
if (_is_reader_poll_stopped(self->super.reader))
{
self->file_state.deleted_eof = TRUE;
_schedule_state_change_handling(self);
}
}
static gboolean
_is_deleted_file_eof(WildcardFileReader *self)
{
return (self->file_state.deleted && self->file_state.deleted_eof);
}
static gint
_notify(LogPipe *s, gint notify_code, gpointer user_data)
{
WildcardFileReader *self = (WildcardFileReader *)s;
gint result = NR_OK;
switch(notify_code)
{
case NC_FILE_DELETED:
_set_deleted(self);
break;
case NC_FILE_EOF:
_set_eof(self);
break;
default:
break;
}
result = file_reader_notify_method(s, notify_code, user_data);
if (_is_deleted_file_eof(self))
result |= NR_STOP_ON_EOF;
return result;
}
static void
_handle_file_state_event(gpointer s)
{
WildcardFileReader *self = (WildcardFileReader *)s;
msg_debug("File status changed",
evt_tag_int("EOF", self->file_state.deleted_eof),
evt_tag_int("DELETED", self->file_state.deleted),
evt_tag_str("Filename", self->super.filename->str));
if (_is_deleted_file_eof(self))
_deleted_file_eof(&self->file_state_event, &self->super);
}
static void
_on_file_moved(FileReader *self)
{
log_pipe_notify(&self->super, NC_FILE_DELETED, self);
log_pipe_notify(&self->super, NC_FILE_EOF, self);
}
void
wildcard_file_reader_on_deleted_file_eof(WildcardFileReader *self,
FileStateEventCallback cb,
gpointer user_data)
{
self->file_state_event.deleted_file_eof = cb;
self->file_state_event.deleted_file_eof_user_data = user_data;
}
gboolean
wildcard_file_reader_is_deleted(WildcardFileReader *self)
{
return self->file_state.deleted;
}
WildcardFileReader *
wildcard_file_reader_new(const gchar *filename, FileReaderOptions *options, FileOpener *opener, LogSrcDriver *owner,
GlobalConfig *cfg)
{
WildcardFileReader *self = g_new0(WildcardFileReader, 1);
file_reader_init_instance(&self->super, filename, options, opener, owner, cfg, "wildcard_file_sd");
self->super.super.init = _init;
self->super.super.notify = _notify;
self->super.super.deinit = _deinit;
self->super.on_file_moved = _on_file_moved;
IV_TASK_INIT(&self->file_state_event_handler);
self->file_state_event_handler.cookie = self;
self->file_state_event_handler.handler = _handle_file_state_event;
return self;
}
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