ipmi_sensor support connecting locally rather than via TCP influxdata…

…#1547

plugins/inputs/ipmi_sensor/README.md

@@ -4,7 +4,11 @@ Get bare metal metrics using the command line utility `ipmitool`
 
 see ipmitool(https://sourceforge.net/projects/ipmitool/files/ipmitool/)
 
-The plugin will use the following command to collect remote host sensor stats:
+The plugin can work with two type of interfaces: open, lan.
+
+When the interface is 'open', the ipmitool utilizes the OpenIPMI kernel device driver to retrieve the sensor stats.
+
+If you set the interface to 'lan', the plugin will use the following command to collect remote host sensor stats:
 
 ipmitool -I lan -H 192.168.1.1 -U USERID -P PASSW0RD sdr
 

plugins/inputs/ipmi_sensor/connection.go

@@ -47,18 +47,21 @@ func NewConnection(server string) *Connection {
 func (t *Connection) options() []string {
 	intf := t.Interface
 	if intf == "" {
-		intf = "lan"
+		intf = "open"
 	}
 
-	options := []string{
-		"-H", t.Hostname,
-		"-U", t.Username,
-		"-P", t.Password,
-		"-I", intf,
-	}
+	switch intf {
+		case "lan":
+			options := []string{
+				"-H", t.Hostname,
+				"-U", t.Username,
+				"-P", t.Password,
+				"-I", intf
+			}
 
-	if t.Port != 0 {
-		options = append(options, "-p", strconv.Itoa(t.Port))
+			if t.Port != 0 {
+				options = append(options, "-p", strconv.Itoa(t.Port))
+			}
 	}
 
 	return options