1 files changed, 89 insertions, 0 deletions
diff --git a/src/go/collectors/go.d.plugin/modules/ntpd/client.go b/src/go/collectors/go.d.plugin/modules/ntpd/client.go
new file mode 100644
index 000000000..8e111cd76
--- /dev/null
+++ b/src/go/collectors/go.d.plugin/modules/ntpd/client.go
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package ntpd
+
+import (
+	"net"
+	"time"
+
+	"github.com/facebook/time/ntp/control"
+)
+
+func newNTPClient(c Config) (ntpConn, error) {
+	conn, err := net.DialTimeout("udp", c.Address, c.Timeout.Duration())
+	if err != nil {
+		return nil, err
+	}
+
+	client := &ntpClient{
+		conn:    conn,
+		timeout: c.Timeout.Duration(),
+		client:  &control.NTPClient{Connection: conn},
+	}
+
+	return client, nil
+}
+
+type ntpClient struct {
+	conn    net.Conn
+	timeout time.Duration
+	client  *control.NTPClient
+}
+
+func (c *ntpClient) systemInfo() (map[string]string, error) {
+	return c.peerInfo(0)
+}
+
+func (c *ntpClient) peerInfo(id uint16) (map[string]string, error) {
+	msg := &control.NTPControlMsgHead{
+		VnMode:        control.MakeVnMode(2, control.Mode),
+		REMOp:         control.OpReadVariables,
+		AssociationID: id,
+	}
+
+	if err := c.conn.SetDeadline(time.Now().Add(c.timeout)); err != nil {
+		return nil, err
+	}
+
+	resp, err := c.client.Communicate(msg)
+	if err != nil {
+		return nil, err
+	}
+
+	return resp.GetAssociationInfo()
+}
+
+func (c *ntpClient) peerIDs() ([]uint16, error) {
+	msg := &control.NTPControlMsgHead{
+		VnMode: control.MakeVnMode(2, control.Mode),
+		REMOp:  control.OpReadStatus,
+	}
+
+	if err := c.conn.SetDeadline(time.Now().Add(c.timeout)); err != nil {
+		return nil, err
+	}
+
+	resp, err := c.client.Communicate(msg)
+	if err != nil {
+		return nil, err
+	}
+
+	peers, err := resp.GetAssociations()
+	if err != nil {
+		return nil, err
+	}
+
+	var ids []uint16
+	for id := range peers {
+		ids = append(ids, id)
+	}
+
+	return ids, nil
+}
+
+func (c *ntpClient) close() {
+	if c.conn != nil {
+		_ = c.conn.Close()
+		c.conn = nil
+	}
+}