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// 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
}
}
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