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/*
* Copyright (c) 2002-2013 Balabit
* Copyright (c) 2013 Viktor Juhasz
* Copyright (c) 2013 Viktor Tusa
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; 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 "rcptid.h"
#include "messages.h"
#include "str-format.h"
static struct _RcptidService
{
PersistState *persist_state;
PersistEntryHandle persist_handle;
GMutex lock;
} rcptid_service;
/* NOTE: RcptIdInstance is a singleton, so we don't pass self around as an argument */
#define self (&rcpt_instance)
static RcptidState *
rcptid_map_state(void)
{
return (RcptidState *) persist_state_map_entry(rcptid_service.persist_state, rcptid_service.persist_handle);
}
static void
rcptid_unmap_state(void)
{
persist_state_unmap_entry(rcptid_service.persist_state, rcptid_service.persist_handle);
}
static gboolean
rcptid_is_initialized(void)
{
return rcptid_service.persist_state != NULL;
}
static gboolean
rcptid_restore_entry(void)
{
RcptidState *data = rcptid_map_state();
if (data->header.version > 0)
{
msg_error("Internal error restoring log reader state, stored data is too new",
evt_tag_int("version", data->header.version));
rcptid_unmap_state();
return FALSE;
}
if ((data->header.big_endian && G_BYTE_ORDER == G_LITTLE_ENDIAN) ||
(!data->header.big_endian && G_BYTE_ORDER == G_BIG_ENDIAN))
{
data->header.big_endian = !data->header.big_endian;
data->g_rcptid = GUINT64_SWAP_LE_BE(data->g_rcptid);
}
rcptid_unmap_state();
return TRUE;
}
static gboolean
rcptid_create_new_entry(void)
{
RcptidState *data;
rcptid_service.persist_handle = persist_state_alloc_entry(rcptid_service.persist_state, "next.rcptid",
sizeof(RcptidState));
if (!rcptid_service.persist_handle)
{
msg_error("Error allocating RCPTID structure in persist-state");
return FALSE;
}
data = rcptid_map_state();
data->header.version = 0;
data->header.big_endian = (G_BYTE_ORDER == G_BIG_ENDIAN);
data->g_rcptid = 1;
rcptid_unmap_state();
return TRUE;
}
void
rcptid_append_formatted_id(GString *result, guint64 rcptid)
{
if (rcptid)
{
format_uint64_padded(result, 0, 0, 10, rcptid);
}
}
void
rcptid_set_id(guint64 id)
{
RcptidState *data;
if (!rcptid_is_initialized())
return;
g_mutex_lock(&rcptid_service.lock);
data = rcptid_map_state();
data->g_rcptid = id;
rcptid_unmap_state();
g_mutex_unlock(&rcptid_service.lock);
}
guint64
rcptid_generate_id(void)
{
RcptidState *data;
guint64 new_id;
if (!rcptid_is_initialized())
return 0;
g_mutex_lock(&rcptid_service.lock);
data = rcptid_map_state();
new_id = data->g_rcptid++;
if (data->g_rcptid == 0)
data->g_rcptid = 1;
rcptid_unmap_state();
g_mutex_unlock(&rcptid_service.lock);
return new_id;
}
/*restore RCTPID from persist file, if possible, else
create new entry point with "next.rcptid" name*/
gboolean
rcptid_init(PersistState *state, gboolean use_rcptid)
{
gsize size;
guint8 version;
g_assert(rcptid_service.persist_state == NULL);
if (!use_rcptid)
return TRUE;
rcptid_service.persist_state = state;
rcptid_service.persist_handle = persist_state_lookup_entry(state, "next.rcptid", &size, &version);
if (rcptid_service.persist_handle && size == sizeof(RcptidState))
{
return rcptid_restore_entry();
}
else
{
if (rcptid_service.persist_handle)
msg_warning("rcpt-id: persist state: invalid size, allocating a new one");
return rcptid_create_new_entry();
}
}
void
rcptid_deinit(void)
{
rcptid_service.persist_state = NULL;
}
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