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/* $Id: plugin_mysql.c 771 2007-02-25 12:27:26Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_mysql.c $
*
* plugin for execute SQL queries into a MySQL DBSM.
*
* Copyright (C) 2004 Javier Garcia <javi@gsmlandia.com>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This file is part of LCD4Linux.
*
* LCD4Linux is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/* DOC:
* To compile the plugin remember to add -lmysqlclient option into Makefile. I.E: CC = gcc -lmysqlclient
* or run:
* $ gcc -I/usr/include/mysql -L/usr/lib/mysql plugin_mysql.c -lmysqlclient -o plugin_mysql.o
*
* exported functions:
*
* int plugin_init_mysql (void)
*
* adds various functions:
* MySQLquery(query)
* Returns the number of rows in query.
* MySQLstatus()
* Returns the current server status:
* Uptime in seconds and the number of running threads,
* questions, reloads, and open tables.
*
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "debug.h"
#include "plugin.h"
#include "cfg.h"
#ifdef HAVE_MYSQL_MYSQL_H
#include <mysql/mysql.h>
#else
#warning mysql/mysql.h not found: plugin deactivated
#endif
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
#ifdef HAVE_MYSQL_MYSQL_H
static MYSQL conex;
static char Section[] = "Plugin:MySQL";
static int configure_mysql(void)
{
static int configured = 0;
char server[256];
int port;
char user[128];
char password[256];
char database[256];
char *s;
if (configured != 0)
return configured;
s = cfg_get(Section, "server", "localhost");
if (*s == '\0') {
info("[MySQL] empty '%s.server' entry from %s, assuming 'localhost'", Section, cfg_source());
strcpy(server, "localhost");
} else
strcpy(server, s);
free(s);
if (cfg_number(Section, "port", 0, 1, 65536, &port) < 1) {
/* using 0 as default port because mysql_real_connect() will convert it to real default one */
info("[MySQL] no '%s.port' entry from %s using MySQL's default", Section, cfg_source());
}
s = cfg_get(Section, "user", "");
if (*s == '\0') {
/* If user is NULL or the empty string "", the lcd4linux Unix user is assumed. */
info("[MySQL] empty '%s.user' entry from %s, assuming lcd4linux owner", Section, cfg_source());
strcpy(user, "");
} else
strcpy(user, s);
free(s);
s = cfg_get(Section, "password", "");
/* Do not encrypt the password because encryption is handled automatically by the MySQL client API. */
if (*s == '\0') {
info("[MySQL] empty '%s.password' entry in %s, assuming none", Section, cfg_source());
strcpy(password, "");
} else
strcpy(password, s);
free(s);
s = cfg_get(Section, "database", "");
if (*s == '\0') {
error("[MySQL] no '%s:database' entry from %s, specify one", Section, cfg_source());
free(s);
configured = -1;
return configured;
}
strcpy(database, s);
free(s);
mysql_init(&conex);
if (!mysql_real_connect(&conex, server, user, password, database, port, NULL, 0)) {
error("[MySQL] conection error: %s", mysql_error(&conex));
configured = -1;
return configured;
}
configured = 1;
return configured;
}
static void my_MySQLcount(RESULT * result, RESULT * query)
{
char *q;
double value;
MYSQL_RES *res;
if (configure_mysql() < 0) {
value = -1;
SetResult(&result, R_NUMBER, &value);
return;
}
q = R2S(query);
/* mysql_ping(MYSQL *mysql) checks whether the connection to the server is working. */
/* If it has gone down, an automatic reconnection is attempted. */
mysql_ping(&conex);
if (mysql_real_query(&conex, q, (unsigned int) strlen(q))) {
error("[MySQL] query error: %s", mysql_error(&conex));
value = -1;
} else {
/* We don't use res=mysql_use_result(); because mysql_num_rows() will not */
/* return the correct value until all the rows in the result set have been retrieved */
/* with mysql_fetch_row(), so we use res=mysql_store_result(); instead */
res = mysql_store_result(&conex);
value = (double) mysql_num_rows(res);
mysql_free_result(res);
}
SetResult(&result, R_NUMBER, &value);
}
static void my_MySQLquery(RESULT * result, RESULT * query)
{
char *q;
double value;
MYSQL_RES *res;
MYSQL_ROW row = NULL;
if (configure_mysql() < 0) {
value = -1;
SetResult(&result, R_NUMBER, &value);
return;
}
q = R2S(query);
/* mysql_ping(MYSQL *mysql) checks whether the connection to the server is working. */
/* If it has gone down, an automatic reconnection is attempted. */
mysql_ping(&conex);
if (mysql_real_query(&conex, q, (unsigned int) strlen(q))) {
error("[MySQL] query error: %s", mysql_error(&conex));
value = -1;
} else {
/* We don't use res=mysql_use_result(); because mysql_num_rows() will not */
/* return the correct value until all the rows in the result set have been retrieved */
/* with mysql_fetch_row(), so we use res=mysql_store_result(); instead */
res = mysql_store_result(&conex);
row = mysql_fetch_row(res);
mysql_free_result(res);
}
SetResult(&result, R_STRING, row[0]);
}
static void my_MySQLstatus(RESULT * result)
{
const char *value = "";
const char *status;
if (configure_mysql() > 0) {
mysql_ping(&conex);
status = mysql_stat(&conex);
if (!status) {
error("[MySQL] status error: %s", mysql_error(&conex));
value = "error";
} else {
value = status;
}
}
SetResult(&result, R_STRING, value);
}
#endif
int plugin_init_mysql(void)
{
#ifdef HAVE_MYSQL_MYSQL_H
AddFunction("MySQL::count", 1, my_MySQLcount);
AddFunction("MySQL::query", 1, my_MySQLquery);
AddFunction("MySQL::status", 0, my_MySQLstatus);
#endif
return 0;
}
void plugin_exit_mysql(void)
{
#ifdef HAVE_MYSQL_MYSQL_H
mysql_close(&conex);
#endif
}
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