88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
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package quicdialer
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import (
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"context"
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"crypto/tls"
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"errors"
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"net"
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"strconv"
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"time"
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"github.com/lucas-clemente/quic-go"
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"github.com/ooni/probe-cli/v3/internal/engine/netx/errorx"
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"github.com/ooni/probe-cli/v3/internal/engine/netx/trace"
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)
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// SystemDialer is the basic dialer for QUIC
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type SystemDialer struct {
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// Saver saves read/write events on the underlying UDP
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// connection. (Implementation note: we need it here since
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// this is the only part in the codebase that is able to
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// observe the underlying UDP connection.)
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Saver *trace.Saver
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}
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// DialContext implements ContextDialer.DialContext
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func (d SystemDialer) DialContext(ctx context.Context, network string,
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host string, tlsCfg *tls.Config, cfg *quic.Config) (quic.EarlySession, error) {
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onlyhost, onlyport, err := net.SplitHostPort(host)
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port, err := strconv.Atoi(onlyport)
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if err != nil {
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return nil, err
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}
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ip := net.ParseIP(onlyhost)
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if ip == nil {
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// TODO(kelmenhorst): write test for this error condition.
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return nil, errors.New("quicdialer: invalid IP representation")
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}
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udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
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var pconn net.PacketConn = udpConn
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if d.Saver != nil {
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pconn = saverUDPConn{UDPConn: udpConn, saver: d.Saver}
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}
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udpAddr := &net.UDPAddr{IP: ip, Port: port, Zone: ""}
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return quic.DialEarlyContext(ctx, pconn, udpAddr, host, tlsCfg, cfg)
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}
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type saverUDPConn struct {
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*net.UDPConn
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saver *trace.Saver
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}
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func (c saverUDPConn) WriteTo(p []byte, addr net.Addr) (int, error) {
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start := time.Now()
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count, err := c.UDPConn.WriteTo(p, addr)
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stop := time.Now()
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c.saver.Write(trace.Event{
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Address: addr.String(),
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Data: p[:count],
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Duration: stop.Sub(start),
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Err: err,
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NumBytes: count,
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Name: errorx.WriteToOperation,
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Time: stop,
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})
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return count, err
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}
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func (c saverUDPConn) ReadMsgUDP(b, oob []byte) (int, int, int, *net.UDPAddr, error) {
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start := time.Now()
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n, oobn, flags, addr, err := c.UDPConn.ReadMsgUDP(b, oob)
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stop := time.Now()
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var data []byte
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if n > 0 {
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data = b[:n]
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}
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c.saver.Write(trace.Event{
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Address: addr.String(),
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Data: data,
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Duration: stop.Sub(start),
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Err: err,
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NumBytes: n,
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Name: errorx.ReadFromOperation,
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Time: stop,
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})
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return n, oobn, flags, addr, err
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}
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