package net_response import ( "bufio" "errors" "net" "net/textproto" "regexp" "time" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/plugins/inputs" ) // NetResponses struct type NetResponse struct { Address string Timeout float64 ReadTimeout float64 Send string Expect string Protocol string } func (_ *NetResponse) Description() string { return "TCP or UDP 'ping' given url and collect response time in seconds" } var sampleConfig = ` ### Protocol, must be "tcp" or "udp" protocol = "tcp" ### Server address (default localhost) address = "github.com:80" ### Set timeout (default 1.0 seconds) timeout = 1.0 ### Set read timeout (default 1.0 seconds) read_timeout = 1.0 ### Optional string sent to the server # send = "ssh" ### Optional expected string in answer # expect = "ssh" ` func (_ *NetResponse) SampleConfig() string { return sampleConfig } func (t *NetResponse) TcpGather() (map[string]interface{}, error) { // Prepare fields fields := make(map[string]interface{}) // Start Timer start := time.Now() // Resolving tcpAddr, err := net.ResolveTCPAddr("tcp", t.Address) // Connecting conn, err := net.DialTCP("tcp", nil, tcpAddr) // Stop timer responseTime := time.Since(start).Seconds() // Handle error if err != nil { return nil, err } defer conn.Close() // Send string if needed if t.Send != "" { msg := []byte(t.Send) conn.Write(msg) conn.CloseWrite() // Stop timer responseTime = time.Since(start).Seconds() } // Read string if needed if t.Expect != "" { // Set read timeout conn.SetReadDeadline(time.Now().Add(time.Duration(t.ReadTimeout) * time.Second)) // Prepare reader reader := bufio.NewReader(conn) tp := textproto.NewReader(reader) // Read data, err := tp.ReadLine() // Stop timer responseTime = time.Since(start).Seconds() // Handle error if err != nil { fields["string_found"] = false } else { // Looking for string in answer RegEx := regexp.MustCompile(`.*` + t.Expect + `.*`) find := RegEx.FindString(string(data)) if find != "" { fields["string_found"] = true } else { fields["string_found"] = false } } } fields["response_time"] = responseTime return fields, nil } func (u *NetResponse) UdpGather() (map[string]interface{}, error) { // Prepare fields fields := make(map[string]interface{}) // Start Timer start := time.Now() // Resolving udpAddr, err := net.ResolveUDPAddr("udp", u.Address) LocalAddr, err := net.ResolveUDPAddr("udp", "127.0.0.1:0") // Connecting conn, err := net.DialUDP("udp", LocalAddr, udpAddr) defer conn.Close() // Handle error if err != nil { return nil, err } // Send string msg := []byte(u.Send) conn.Write(msg) // Read string // Set read timeout conn.SetReadDeadline(time.Now().Add(time.Duration(u.ReadTimeout) * time.Second)) // Read buf := make([]byte, 1024) _, _, err = conn.ReadFromUDP(buf) // Stop timer responseTime := time.Since(start).Seconds() // Handle error if err != nil { return nil, err } else { // Looking for string in answer RegEx := regexp.MustCompile(`.*` + u.Expect + `.*`) find := RegEx.FindString(string(buf)) if find != "" { fields["string_found"] = true } else { fields["string_found"] = false } } fields["response_time"] = responseTime return fields, nil } func (c *NetResponse) Gather(acc telegraf.Accumulator) error { // Set default values if c.Timeout == 0 { c.Timeout = 1.0 } if c.ReadTimeout == 0 { c.ReadTimeout = 1.0 } // Check send and expected string if c.Protocol == "udp" && c.Send == "" { return errors.New("Send string cannot be empty") } if c.Protocol == "udp" && c.Expect == "" { return errors.New("Expected string cannot be empty") } // Prepare host and port host, port, err := net.SplitHostPort(c.Address) if err != nil { return err } if host == "" { c.Address = "localhost:" + port } if port == "" { return errors.New("Bad port") } // Prepare data tags := map[string]string{"host": host, "port": port} var fields map[string]interface{} // Gather data if c.Protocol == "tcp" { fields, err = c.TcpGather() tags["protocol"] = "tcp" } else if c.Protocol == "udp" { fields, err = c.UdpGather() tags["protocol"] = "udp" } else { return errors.New("Bad protocol") } if err != nil { return err } // Add metrics acc.AddFields("net_response", fields, tags) return nil } func init() { inputs.Add("net_response", func() telegraf.Input { return &NetResponse{} }) }