Add tcp/udp check connection plugin

plugins/inputs/all/all.go

@@ -4,6 +4,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/aerospike"
 	_ "github.com/influxdata/telegraf/plugins/inputs/apache"
 	_ "github.com/influxdata/telegraf/plugins/inputs/bcache"
+	_ "github.com/influxdata/telegraf/plugins/inputs/connection"
 	_ "github.com/influxdata/telegraf/plugins/inputs/disque"
 	_ "github.com/influxdata/telegraf/plugins/inputs/docker"
 	_ "github.com/influxdata/telegraf/plugins/inputs/elasticsearch"

plugins/inputs/connection/connection.go

@@ -0,0 +1,286 @@
+package connection
+
+import (
+	"bufio"
+	"errors"
+	"net"
+	"net/textproto"
+	"regexp"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+// Connections struct
+type Connection struct {
+	Tcps []Tcp `toml:"tcp"`
+	Udps []Udp `toml:"udp"`
+}
+
+// Tcp connection struct
+type Tcp struct {
+	Address     string
+	Timeout     float64
+	ReadTimeout float64
+	Send        string
+	Expect      string
+}
+
+// Udp connection struct
+type Udp struct {
+	Address     string
+	Timeout     float64
+	ReadTimeout float64
+	Send        string
+	Expect      string
+}
+
+func (_ *Connection) Description() string {
+	return "Ping given url(s) and return statistics"
+}
+
+var sampleConfig = `
+  [[inputs.connection.tcp]]
+    # Server address (default IP localhost)
+    address = "github.com:80"
+    # Set timeout (default 1.0)
+    timeout = 1.0
+    # Set read timeout (default 1.0)
+    read_timeout = 1.0
+    # String sent to the server
+    send = "ssh"
+    # Expected string in answer
+    expect = "ssh"
+
+  [[inputs.connection.tcp]]
+    address = ":80"
+
+  [[inputs.connection.udp]]
+    # Server address (default IP localhost)
+    address = "github.com:80"
+    # Set timeout (default 1.0)
+    timeout = 1.0
+    # Set read timeout (default 1.0)
+    read_timeout = 1.0
+    # String sent to the server
+    send = "ssh"
+    # Expected string in answer
+    expect = "ssh"
+
+  [[inputs.connection.udp]]
+    address = "localhost:161"
+    timeout = 2.0
+`
+
+func (_ *Connection) SampleConfig() string {
+	return sampleConfig
+}
+
+func (t *Tcp) Gather() (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 *Udp) Gather() (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 *Connection) Gather(acc telegraf.Accumulator) error {
+
+	var wg sync.WaitGroup
+	errorChannel := make(chan error, (len(c.Tcps)+len(c.Udps))*2)
+
+	// Spin off a go routine for each TCP
+	for _, tcp := range c.Tcps {
+		wg.Add(1)
+		go func(tcp Tcp, acc telegraf.Accumulator) {
+			defer wg.Done()
+			// Set default Tcp values
+			if tcp.Timeout == 0 {
+				tcp.Timeout = 1.0
+			}
+			if tcp.ReadTimeout == 0 {
+				tcp.ReadTimeout = 1.0
+			}
+			// Prepare host and port
+			host, port, err := net.SplitHostPort(tcp.Address)
+			if err != nil {
+				errorChannel <- err
+				return
+			}
+			if host == "" {
+				tcp.Address = "localhost:" + port
+			}
+			if port == "" {
+				errorChannel <- errors.New("Bad port")
+				return
+			}
+			// Gather data
+			fields, err := tcp.Gather()
+			if err != nil {
+				errorChannel <- err
+				return
+			}
+			tags := map[string]string{"server": tcp.Address}
+			// Add metrics
+			acc.AddFields("tcp_connection", fields, tags)
+		}(tcp, acc)
+	}
+
+	// Spin off a go routine for each UDP
+	for _, udp := range c.Udps {
+		wg.Add(1)
+		go func(udp Udp, acc telegraf.Accumulator) {
+			defer wg.Done()
+			// Check send and expected string
+			if udp.Send == "" {
+				errorChannel <- errors.New("Send string cannot be empty")
+				return
+			}
+			if udp.Expect == "" {
+				errorChannel <- errors.New("Expected string cannot be empty")
+				return
+			}
+			// Set default Tcp values
+			if udp.Timeout == 0 {
+				udp.Timeout = 1.0
+			}
+			if udp.ReadTimeout == 0 {
+				udp.ReadTimeout = 1.0
+			}
+			// Prepare host and port
+			host, port, err := net.SplitHostPort(udp.Address)
+			if err != nil {
+				errorChannel <- err
+				return
+			}
+			if host == "" {
+				udp.Address = "localhost:" + port
+			}
+			if port == "" {
+				errorChannel <- errors.New("Bad port")
+				return
+			}
+			// Gather data
+			fields, err := udp.Gather()
+			if err != nil {
+				errorChannel <- err
+				return
+			}
+			tags := map[string]string{"server": udp.Address}
+			// Add metrics
+			acc.AddFields("udp_connection", fields, tags)
+		}(udp, acc)
+	}
+
+	wg.Wait()
+	close(errorChannel)
+
+	// Get all errors and return them as one giant error
+	errorStrings := []string{}
+	for err := range errorChannel {
+		errorStrings = append(errorStrings, err.Error())
+	}
+
+	if len(errorStrings) == 0 {
+		return nil
+	}
+	return errors.New(strings.Join(errorStrings, "\n"))
+}
+
+func init() {
+	inputs.Add("connection", func() telegraf.Input {
+		return &Connection{}
+	})
+}