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/*
* Copyright (c) 2020 Attila Szakacs <attila.szakacs@balabit.com>
* Copyright (c) 2023 Hofi <hofione@gmail.com>
*
* 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 "darwinosl-source-persist.h"
#include "messages.h"
#include "persistable-state-header.h"
#include "ack-tracker/ack_tracker.h"
#define DARWINOSL_SOURCE_PERSIST_VERSION_1 1
typedef struct _DarwinOSLogSourcePersistData
{
PersistableStateHeader header;
DarwinOSLogSourcePosition position;
} DarwinOSLogSourcePersistData;
typedef struct _DarwinOSLogSourceBookmark
{
PersistEntryHandle persist_handle;
DarwinOSLogSourcePersistData data;
} DarwinOSLogSourceBookmark;
struct _DarwinOSLogSourcePersist
{
PersistState *persist_state;
PersistEntryHandle handle;
};
DarwinOSLogSourcePersist *
darwinosl_source_persist_new(void)
{
DarwinOSLogSourcePersist *self = g_new0(DarwinOSLogSourcePersist, 1);
return self;
}
void
darwinosl_source_persist_free(DarwinOSLogSourcePersist *self)
{
g_free(self);
}
static PersistEntryHandle
_lookup_handle(DarwinOSLogSourcePersist *self, const gchar *persist_name)
{
gsize size;
guint8 version;
return persist_state_lookup_entry(self->persist_state, persist_name, &size, &version);
}
static gboolean
_check_version(DarwinOSLogSourcePersistData *persist_data, const gchar *persist_name)
{
switch (persist_data->header.version)
{
case DARWINOSL_SOURCE_PERSIST_VERSION_1:
return TRUE;
/* Conversion functions might come here. */
default:
msg_error("Incompatible darwinosl-source persist version in persist file",
evt_tag_str("persist_name", persist_name),
evt_tag_int("version", persist_data->header.version),
evt_tag_int("expected_version", DARWINOSL_SOURCE_PERSIST_VERSION_1));
return FALSE;
}
}
static gboolean
_check_compatibility(DarwinOSLogSourcePersist *self, PersistEntryHandle persist_handle, const gchar *persist_name)
{
DarwinOSLogSourcePersistData *persist_data = persist_state_map_entry(self->persist_state, persist_handle);
g_assert(persist_data);
if (!_check_version(persist_data, persist_name))
{
persist_state_unmap_entry(self->persist_state, persist_handle);
return FALSE;
}
persist_state_unmap_entry(self->persist_state, persist_handle);
return TRUE;
}
static gboolean
_load_persist_entry(DarwinOSLogSourcePersist *self, const gchar *persist_name)
{
PersistEntryHandle persist_handle = _lookup_handle(self, persist_name);
if (!persist_handle)
return FALSE;
g_assert(_check_compatibility(self, persist_handle, persist_name));
self->handle = persist_handle;
return TRUE;
}
static void
_persist_data_defaults(DarwinOSLogSourcePersistData *persist_data)
{
memset(persist_data, 0, sizeof(DarwinOSLogSourcePersistData));
persist_data->header.version = DARWINOSL_SOURCE_PERSIST_VERSION_1;
persist_data->header.big_endian = (G_BYTE_ORDER == G_BIG_ENDIAN);
}
static gboolean
_create_persist_entry(DarwinOSLogSourcePersist *self, const gchar *persist_name)
{
PersistEntryHandle persist_handle = persist_state_alloc_entry(self->persist_state, persist_name,
sizeof(DarwinOSLogSourcePersistData));
if (!persist_handle)
{
msg_error("Could not allocate darwinosl-source persist entry",
evt_tag_str("persist_name", persist_name));
return FALSE;
}
DarwinOSLogSourcePersistData *persist_data = persist_state_map_entry(self->persist_state, persist_handle);
if (!persist_data)
{
msg_error("Could not map darwinosl-source persist state",
evt_tag_str("persist_name", persist_name));
return FALSE;
}
_persist_data_defaults(persist_data);
persist_state_unmap_entry(self->persist_state, persist_handle);
self->handle = persist_handle;
msg_trace("darwinosl-source persist entry created",
evt_tag_str("persist_name", persist_name));
return TRUE;
}
gboolean
darwinosl_source_persist_init(DarwinOSLogSourcePersist *self, PersistState *persist_state, const gchar *persist_name)
{
self->persist_state = persist_state;
return _load_persist_entry(self, persist_name) ||
_create_persist_entry(self, persist_name);
}
static void
_save_bookmark(Bookmark *bookmark)
{
DarwinOSLogSourceBookmark *darwinosl_source_bookmark = (DarwinOSLogSourceBookmark *)(&bookmark->container);
DarwinOSLogSourcePersistData *persistable_data = &darwinosl_source_bookmark->data;
DarwinOSLogSourcePersistData *persist_entry = persist_state_map_entry(bookmark->persist_state,
darwinosl_source_bookmark->persist_handle);
persist_entry->position = persistable_data->position;
persist_state_unmap_entry(bookmark->persist_state, darwinosl_source_bookmark->persist_handle);
}
void
darwinosl_source_persist_fill_bookmark(DarwinOSLogSourcePersist *self, Bookmark *bookmark,
DarwinOSLogSourcePosition position)
{
DarwinOSLogSourceBookmark *darwinosl_source_bookmark = (DarwinOSLogSourceBookmark *)(&bookmark->container);
DarwinOSLogSourcePersistData *persistable_data = &darwinosl_source_bookmark->data;
darwinosl_source_bookmark->persist_handle = self->handle;
persistable_data->position = position;
bookmark->save = _save_bookmark;
}
void
darwinosl_source_persist_load_position(DarwinOSLogSourcePersist *self, DarwinOSLogSourcePosition *position)
{
DarwinOSLogSourcePersistData *persist_data = persist_state_map_entry(self->persist_state, self->handle);
g_assert(persist_data);
*position = persist_data->position;
persist_state_unmap_entry(self->persist_state, self->handle);
}
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