/*      $NetBSD: syslog.c,v 1.2 2015/02/02 14:03:05 lneto Exp $ */

/*
 * Copyright (c) 2013 Marc Balmer <marc@msys.ch>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* Lua binding for syslog */

#include <sys/types.h>

#include <errno.h>
#include <lua.h>
#include <lauxlib.h>
#include <stdlib.h>
#include <syslog.h>
#include <unistd.h>

int luaopen_syslog(lua_State *);

static int
syslog_openlog(lua_State *L)
{
        const char *ident;
        int option;
        int facility;

        ident = luaL_checkstring(L, 1);
        option = luaL_checkinteger(L, 2);
        facility = luaL_checkinteger(L, 3);
        openlog(ident, option, facility);
        return 0;
}

static int
syslog_syslog(lua_State *L)
{
        syslog((int) luaL_checkinteger(L, 1), "%s", luaL_checkstring(L, 2));
        return 0;
}

static int
syslog_closelog(lua_State *L)
{
        closelog();
        return 0;
}

static int
syslog_setlogmask(lua_State *L)
{
        lua_pushinteger(L, setlogmask((int) luaL_checkinteger(L, 1)));
        return 1;
}

static void
syslog_set_info(lua_State *L)
{
        lua_pushliteral(L, "_COPYRIGHT");
        lua_pushliteral(L, "Copyright (C) 2013 by "
            "Marc Balmer <marc@msys.ch>");
        lua_settable(L, -3);
        lua_pushliteral(L, "_DESCRIPTION");
        lua_pushliteral(L, "syslog binding for Lua");
        lua_settable(L, -3);
        lua_pushliteral(L, "_VERSION");
        lua_pushliteral(L, "syslog 1.0.0");
        lua_settable(L, -3);
}

struct constant {
        const char *name;
        int value;
};

#define CONSTANT(NAME)          { #NAME, NAME }

static struct constant syslog_constant[] = {
        /* syslog options */
        CONSTANT(LOG_CONS),
        CONSTANT(LOG_NDELAY),
        CONSTANT(LOG_NOWAIT),
        CONSTANT(LOG_ODELAY),
        CONSTANT(LOG_PERROR),
        CONSTANT(LOG_PID),

        /* syslog facilities */
        CONSTANT(LOG_AUTH),
        CONSTANT(LOG_AUTHPRIV),
        CONSTANT(LOG_CRON),
        CONSTANT(LOG_DAEMON),
        CONSTANT(LOG_FTP),
        CONSTANT(LOG_KERN),
        CONSTANT(LOG_LOCAL0),
        CONSTANT(LOG_LOCAL1),
        CONSTANT(LOG_LOCAL2),
        CONSTANT(LOG_LOCAL3),
        CONSTANT(LOG_LOCAL4),
        CONSTANT(LOG_LOCAL5),
        CONSTANT(LOG_LOCAL6),
        CONSTANT(LOG_LOCAL7),
        CONSTANT(LOG_LPR),
        CONSTANT(LOG_MAIL),
        CONSTANT(LOG_NEWS),
        CONSTANT(LOG_SYSLOG),
        CONSTANT(LOG_USER),
        CONSTANT(LOG_UUCP),

        /* syslog levels */
        CONSTANT(LOG_EMERG),
        CONSTANT(LOG_ALERT),
        CONSTANT(LOG_CRIT),
        CONSTANT(LOG_ERR),
        CONSTANT(LOG_WARNING),
        CONSTANT(LOG_NOTICE),
        CONSTANT(LOG_INFO),
        CONSTANT(LOG_DEBUG),

        { NULL, 0 }
};

int
luaopen_syslog(lua_State *L)
{
        int n;
        struct luaL_Reg luasyslog[] = {
                { "openlog",    syslog_openlog },
                { "syslog",     syslog_syslog },
                { "closelog",   syslog_closelog },
                { "setlogmask", syslog_setlogmask },
                { NULL, NULL }
        };

#if LUA_VERSION_NUM >= 502
        luaL_newlib(L, luasyslog);
#else
        luaL_register(L, "syslog", luasyslog);
#endif
        syslog_set_info(L);
        for (n = 0; syslog_constant[n].name != NULL; n++) {
                lua_pushinteger(L, syslog_constant[n].value);
                lua_setfield(L, -2, syslog_constant[n].name);
        };
        return 1;
}