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/*
* Copyright (c) 2010-2014 Balabit
* Copyright (c) 2010-2014 Viktor Juhasz <viktor.juhasz@balabit.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 "journald-subsystem.h"
#include "messages.h"
#include <glib.h>
#include <gmodule.h>
#if SYSLOG_NG_SYSTEMD_JOURNAL_MODE == SYSLOG_NG_JOURNALD_SYSTEM
#else
int (*sd_journal_open)(sd_journal **ret, int flags);
#if SYSLOG_NG_HAVE_JOURNAL_NAMESPACES
int (*sd_journal_open_namespace)(sd_journal **ret, const char *namespace, int flags);
#endif
void (*sd_journal_close)(sd_journal *j);
int (*sd_journal_seek_head)(sd_journal *j);
int (*sd_journal_seek_tail)(sd_journal *j);
int (*sd_journal_get_cursor)(sd_journal *j, char **cursor);
int (*sd_journal_next)(sd_journal *j);
void (*sd_journal_restart_data)(sd_journal *j);
int (*sd_journal_enumerate_data)(sd_journal *j, const void **data, size_t *length);
int (*sd_journal_seek_cursor)(sd_journal *j, const char *cursor);
int (*sd_journal_test_cursor)(sd_journal *j, const char *cursor);
int (*sd_journal_get_fd)(sd_journal *j);
int (*sd_journal_process)(sd_journal *j);
int (*sd_journal_get_realtime_usec)(sd_journal *j, uint64_t *usec);
int (*sd_journal_get_realtime_usec)(sd_journal *j, uint64_t *usec);
int (*sd_journal_add_match)(sd_journal *j, const void *data, size_t size);
char *(*sd_id128_to_string)(sd_id128_t id, char s[SD_ID128_STRING_MAX]);
int (*sd_id128_get_boot)(sd_id128_t *ret);
#define LOAD_SYMBOL(library, symbol) _load_module_symbols(library, #symbol, (gpointer *)&symbol)
#define JOURNAL_LIBRARY_NAME "libsystemd-journal.so.0"
#define SYSTEMD_LIBRARY_NAME "libsystemd.so.0"
#define ID128_LIBRARY_NAME "libsystemd-id128.so.0"
const char *journald_libraries[] = {JOURNAL_LIBRARY_NAME, SYSTEMD_LIBRARY_NAME, NULL};
const char *journald_ext_libraries[] = {ID128_LIBRARY_NAME, JOURNAL_LIBRARY_NAME, SYSTEMD_LIBRARY_NAME, NULL};
static GModule *journald_module;
static GModule *journald_ext_module;
typedef struct sd_journal sd_journal;
static GModule *
_journald_module_open(const char *const *libraries)
{
GModule *module = NULL;
for (gint i = 0; (libraries[i] != NULL) && !module; i++)
{
module = g_module_open(libraries[i], 0);
if (!module)
msg_debug("No module by name", evt_tag_str("module", libraries[i]));
}
return module;
}
static gboolean
_load_module_symbols(GModule *library, gchar *symbol_name, gpointer *symbol)
{
if (!g_module_symbol(library, symbol_name, symbol))
{
msg_error("Could not find symbol", evt_tag_str("symbol", symbol_name));
return FALSE;
}
return TRUE;
}
static gboolean
_load_journald_symbols(void)
{
if (!LOAD_SYMBOL(journald_module, sd_journal_open))
return FALSE;
#if SYSLOG_NG_HAVE_JOURNAL_NAMESPACES
if (!LOAD_SYMBOL(journald_module, sd_journal_open_namespace))
return FALSE;
#endif
if (!LOAD_SYMBOL(journald_module, sd_journal_close))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_seek_head))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_seek_tail))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_get_cursor))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_next))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_restart_data))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_enumerate_data))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_seek_cursor))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_get_fd))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_process))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_get_realtime_usec))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_test_cursor))
return FALSE;
if (!LOAD_SYMBOL(journald_module, sd_journal_add_match))
return FALSE;
if (!LOAD_SYMBOL(journald_ext_module, sd_id128_to_string))
return FALSE;
if (!LOAD_SYMBOL(journald_ext_module, sd_id128_get_boot))
return FALSE;
return TRUE;
}
void
unload_journald_subsystem(void)
{
if (journald_module)
{
g_module_close(journald_module);
journald_module = NULL;
}
if (journald_ext_module)
{
g_module_close(journald_ext_module);
journald_module = NULL;
}
}
int
load_journald_subsystem(void)
{
if (!journald_module && !journald_ext_module)
{
journald_module = _journald_module_open(journald_libraries);
if (!journald_module)
{
msg_error("Could not find journald_module");
return FALSE;
}
journald_ext_module = _journald_module_open(journald_ext_libraries);
if (!journald_ext_module)
{
msg_error("Could not find journald_ext_module");
return FALSE;
}
if (!_load_journald_symbols())
{
unload_journald_subsystem();
return FALSE;
}
}
return TRUE;
}
#endif
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