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/*
* Copyright (c) 2014 Balabit
* Copyright (c) 2014 Laszlo Budai
*
* 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 "host-id.h"
#include "str-format.h"
#include "messages.h"
#include <openssl/rand.h>
guint32 global_host_id = 0;
static guint32
_create_host_id(void)
{
union
{
unsigned char _raw[sizeof(guint32)];
guint32 id;
} host_id;
RAND_bytes(host_id._raw, sizeof(host_id._raw));
return host_id.id;
}
static gboolean
_load_host_id_from_legacy_persist_entry(PersistState *state, guint32 *host_id)
{
gsize size;
guint8 version;
PersistEntryHandle handle = persist_state_lookup_entry(state, HOST_ID_LEGACY_PERSIST_KEY, &size, &version);
if (!handle)
return FALSE;
guint32 *mapped_hostid = persist_state_map_entry(state, handle);
*host_id = *mapped_hostid;
persist_state_unmap_entry(state, handle);
return TRUE;
}
gboolean
host_id_init(PersistState *state)
{
gsize size;
guint8 version;
PersistEntryHandle handle;
HostIdState *host_id_state;
gboolean host_id_found = TRUE;
guint32 legacy_hostid = 0;
handle = persist_state_lookup_entry(state, HOST_ID_PERSIST_KEY, &size, &version);
if (handle == 0)
{
host_id_found = FALSE;
handle = persist_state_alloc_entry(state, HOST_ID_PERSIST_KEY, sizeof(HostIdState));
if (handle == 0)
{
msg_error("host-id: could not allocate persist state");
return FALSE;
}
}
host_id_state = persist_state_map_entry(state, handle);
if (!host_id_found)
{
if (_load_host_id_from_legacy_persist_entry(state, &legacy_hostid))
{
host_id_state->host_id = legacy_hostid;
}
else
{
host_id_state->host_id = _create_host_id();
}
}
global_host_id = host_id_state->host_id;
persist_state_unmap_entry(state, handle);
return TRUE;
}
guint32
host_id_get(void)
{
return global_host_id;
}
void
host_id_append_formatted_id(GString *str, guint32 id)
{
format_uint32_padded(str, 8, '0', 16, id);
}
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