Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/inputs/powerdns_recursor/protocol_v2.go

@@ -0,0 +1,95 @@
+package powerdns_recursor
+
+import (
+	"errors"
+	"net"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/google/uuid"
+
+	"github.com/influxdata/telegraf"
+)
+
+// V2 (4.5.0 - 4.5.9) Protocol:
+// Unix datagram socket
+// Synchronous request / response, individual datagrams
+// Datagram 1 => status: uint32
+// Datagram 2 => data: byte[] (max 16_384 bytes)
+func (p *PowerdnsRecursor) gatherFromV2Server(address string, acc telegraf.Accumulator) error {
+	recvSocket := filepath.Join(p.SocketDir, "pdns_recursor_telegraf"+uuid.New().String())
+
+	laddr, err := net.ResolveUnixAddr("unixgram", recvSocket)
+	if err != nil {
+		return err
+	}
+
+	defer os.Remove(recvSocket)
+
+	raddr, err := net.ResolveUnixAddr("unixgram", address)
+	if err != nil {
+		return err
+	}
+
+	conn, err := net.DialUnix("unixgram", laddr, raddr)
+	if err != nil {
+		return err
+	}
+
+	defer conn.Close()
+
+	if err := os.Chmod(recvSocket, os.FileMode(p.mode)); err != nil {
+		return err
+	}
+
+	if err := conn.SetDeadline(time.Now().Add(defaultTimeout)); err != nil {
+		return err
+	}
+
+	// First send a 0 status code.
+	_, err = conn.Write([]byte{0, 0, 0, 0})
+	if err != nil {
+		return err
+	}
+
+	// Then send the get-all command.
+	command := "get-all"
+
+	_, err = conn.Write([]byte(command))
+	if err != nil {
+		return err
+	}
+
+	// Read the response status code.
+	status := make([]byte, 4)
+	n, err := conn.Read(status)
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return errors.New("no status code received")
+	}
+
+	// Read the response data.
+	buf := make([]byte, 16_384)
+	n, err = conn.Read(buf)
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return errors.New("no data received")
+	}
+
+	metrics := string(buf)
+
+	// Process data
+	fields := parseResponse(metrics)
+
+	// Add server socket as a tag
+	tags := map[string]string{"server": address}
+
+	acc.AddFields("powerdns_recursor", fields, tags)
+
+	return nil
+}