| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package chrony |
| 4 | |
| 5 | import ( |
| 6 | "fmt" |
| 7 | "net" |
| 8 | "time" |
| 9 | |
| 10 | "github.com/facebook/time/ntp/chrony" |
| 11 | ) |
| 12 | |
| 13 | type chronyConn interface { |
| 14 | tracking() (*chrony.ReplyTracking, error) |
| 15 | activity() (*chrony.ReplyActivity, error) |
| 16 | close() |
| 17 | } |
| 18 | |
| 19 | func newChronyConn(cfg Config) (chronyConn, error) { |
| 20 | conn, err := net.DialTimeout("udp", cfg.Address, cfg.Timeout.Duration()) |
| 21 | if err != nil { |
| 22 | return nil, err |
| 23 | } |
| 24 | |
| 25 | client := &chronyClient{ |
| 26 | conn: conn, |
| 27 | client: &chrony.Client{ |
| 28 | Connection: &connWithTimeout{ |
| 29 | Conn: conn, |
| 30 | timeout: cfg.Timeout.Duration(), |
| 31 | }, |
| 32 | }, |
| 33 | } |
| 34 | |
| 35 | return client, nil |
| 36 | } |
| 37 | |
| 38 | type chronyClient struct { |
| 39 | conn net.Conn |
| 40 | client *chrony.Client |
| 41 | } |
| 42 | |
| 43 | func (c *chronyClient) tracking() (*chrony.ReplyTracking, error) { |
| 44 | req := chrony.NewTrackingPacket() |
| 45 | |
| 46 | reply, err := c.client.Communicate(req) |
| 47 | if err != nil { |
| 48 | return nil, err |
| 49 | } |
| 50 | |
| 51 | tracking, ok := reply.(*chrony.ReplyTracking) |
| 52 | if !ok { |
| 53 | return nil, fmt.Errorf("unexpected reply type, want=%T, got=%T", &chrony.ReplyTracking{}, reply) |
| 54 | } |
| 55 | |
| 56 | return tracking, nil |
| 57 | } |
| 58 | |
| 59 | func (c *chronyClient) activity() (*chrony.ReplyActivity, error) { |
| 60 | req := chrony.NewActivityPacket() |
| 61 | |
| 62 | reply, err := c.client.Communicate(req) |
| 63 | if err != nil { |
| 64 | return nil, err |
| 65 | } |
| 66 | |
| 67 | activity, ok := reply.(*chrony.ReplyActivity) |
| 68 | if !ok { |
| 69 | return nil, fmt.Errorf("unexpected reply type, want=%T, got=%T", &chrony.ReplyActivity{}, reply) |
| 70 | } |
| 71 | |
| 72 | return activity, nil |
| 73 | } |
| 74 | |
| 75 | func (c *chronyClient) close() { |
| 76 | if c.conn != nil { |
| 77 | _ = c.conn.Close() |
| 78 | c.conn = nil |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | type connWithTimeout struct { |
| 83 | net.Conn |
| 84 | timeout time.Duration |
| 85 | } |
| 86 | |
| 87 | func (c *connWithTimeout) Read(p []byte) (n int, err error) { |
| 88 | if err := c.Conn.SetReadDeadline(c.deadline()); err != nil { |
| 89 | return 0, err |
| 90 | } |
| 91 | return c.Conn.Read(p) |
| 92 | } |
| 93 | |
| 94 | func (c *connWithTimeout) Write(p []byte) (n int, err error) { |
| 95 | if err := c.Conn.SetWriteDeadline(c.deadline()); err != nil { |
| 96 | return 0, err |
| 97 | } |
| 98 | return c.Conn.Write(p) |
| 99 | } |
| 100 | |
| 101 | func (c *connWithTimeout) deadline() time.Time { |
| 102 | return time.Now().Add(c.timeout) |
| 103 | } |