diff --git a/helper/zabbix.api.php b/helper/zabbix.api.php
index cae9c9e..d27f2a3 100644
--- a/helper/zabbix.api.php
+++ b/helper/zabbix.api.php
@@ -1,34 +1,79 @@
 <?php
-// @file zabbix.api.php
+/**
+ * @file zabbix.api.php
+ * @date 2019-04-08
+ * @author Go Namhyeon <gnh1201@gmail.com>
+ * @brief Zabbix JSON-RPC API (3.0) interface module
+ * @documentation https://www.zabbix.com/documentation/3.0/manual/api
+ */
 
 if(!check_function_exists("zabbix_get_base_url")) {
-  function zabbix_get_base_url() {
-    return "http://localhost";
-  }
+	function zabbix_get_api_url($host, $protocol="http") {
+		return sprintf("%s://%s/zabbix/api_jsonrpc.php", $protocol, $host);
+	}
 }
 
 if(!check_function_exists("zabbix_authenticate")) {
-  function zabbix_authenticate($username, $password) {
-    $response = false;
-    
-    if(loadHelper("webpagetool")) {
-      $response = get_web_json(zabbix_get_base_url() . "/zabbix/api_jsonrpc.php", "post", array(
-        "headers" => array(
-          "Content-Type" => "application/json-rpc",
-        ),
-        "data" => array(
-          "jsonrpc" => "2.0",
-          "method" => "user.login",
-          "params" => array(
-            "user" => $username,
-            "password" => $password,
-          ),
-          "id" => 1,
-          "auth" => null,
-        ),
-      ));
-    }
+	function zabbix_authenticate($host, $username, $password, $protocol="http") {
+		$response = false;
+		
+		// get zabbix api url
+		$zabbix_api_url = zabbix_get_api_url($host, $protocol);
+		
+		// connect to zabbix server
+		if(loadHelper("webpagetool")) {
+			$response = get_web_json($zabbix_api_url, "post", array(
+				"headers" => array(
+					"Content-Type" => "application/json-rpc",
+				),
+				"data" => array(
+					"jsonrpc" => "2.0",
+					"method" => "user.login",
+					"params" => array(
+						"user" => $username,
+						"password" => $password,
+					),
+					"id" => 1,
+					"auth" => null,
+				),
+			));
+		}
+		
+		// set connection to global scope
+		set_scope("zabbix_api_url", $zabbix_api_url);
+		set_scope("zabbix_auth", get_property_value("result", $response));
 
-    return $response;
-  }
+		return $response;
+	}
+}
+
+if(!check_function_exists("zabbix_retrive_hosts")) {
+	function zabbix_retrive_hosts() {
+		$response = false;
+		
+		// get zabbix authentication
+		$zabbix_api_url = get_scope("zabbix_api_url");
+		$zabbix_auth = get_scope("zabbix_auth");
+		
+		// connect to zabbix server
+		if(loadHelper("webpagetool")) {
+			$response = get_web_json($zabbix_api_url, array(
+				"headers" => array(
+					"Content-Type" => "application/json-rpc",
+				),
+				"data" => array(
+					"jsonprc" => "2.0",
+					"method" => "host.get",
+					"params" => array(
+						"output" => array("hostid", "host"),
+						"selectInterfaces" => array("interfaceid", "ip"),
+					),
+					"id" => 2,
+					"auth" => $zabbix_auth
+				),
+			));
+		}
+		
+		return $response;
+	}
 }