Fix ipmi panic (#9035)

plugins/inputs/ipmi_sensor/connection.go

@@ -32,8 +32,10 @@ func NewConnection(server, privilege, hexKey string) *Connection {
 		security := server[0:inx1]
 		connstr = server[inx1+1:]
 		up := strings.SplitN(security, ":", 2)
-		conn.Username = up[0]
-		conn.Password = up[1]
+		if len(up) == 2 {
+			conn.Username = up[0]
+			conn.Password = up[1]
+		}
 	}
 
 	if inx2 > 0 {

plugins/inputs/ipmi_sensor/connection_test.go

@@ -33,6 +33,18 @@ func TestNewConnection(t *testing.T) {
 				HexKey:    "0001",
 			},
 		},
+		// test connection doesn't panic if incorrect symbol used
+		{
+			"USERID@PASSW0RD@lan(192.168.1.1)",
+			&Connection{
+				Hostname:  "192.168.1.1",
+				Username:  "",
+				Password:  "",
+				Interface: "lan",
+				Privilege: "USER",
+				HexKey:    "0001",
+			},
+		},
 	}
 
 	for _, v := range testData {