c00cad1382
With this change, we will soon be able to move the creation of a QUIC session inside of the netxlite package. Part of https://github.com/ooni/probe/issues/1505.
122 lines
3.1 KiB
Go
122 lines
3.1 KiB
Go
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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// QUICListener listens for QUIC connections.
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type QUICListener interface {
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// Listen creates a new listening net.PacketConn.
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Listen(addr *net.UDPAddr) (net.PacketConn, error)
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}
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// QUICListenerStdlib is a QUICListener using the standard library.
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type QUICListenerStdlib struct{}
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// Listen implements QUICListener.Listen.
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func (qls *QUICListenerStdlib) Listen(addr *net.UDPAddr) (net.PacketConn, error) {
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return net.ListenUDP("udp", addr)
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}
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// QUICListenerSaver is a QUICListener that also implements saving events.
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type QUICListenerSaver struct {
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// QUICListener is the underlying QUICListener.
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QUICListener QUICListener
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// Saver is the underlying Saver.
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Saver *trace.Saver
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}
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// Listen implements QUICListener.Listen.
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func (qls *QUICListenerSaver) Listen(addr *net.UDPAddr) (net.PacketConn, error) {
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pconn, err := qls.QUICListener.Listen(addr)
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if err != nil {
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return nil, err
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}
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// TODO(bassosimone): refactor to remove this restriction.
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udpConn, ok := pconn.(*net.UDPConn)
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if !ok {
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return nil, errors.New("quicdialer: cannot convert to udpConn")
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}
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return saverUDPConn{UDPConn: udpConn, saver: qls.Saver}, nil
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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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// QUICListener is the underlying QUICListener to use.
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QUICListener QUICListener
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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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if err != nil {
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return nil, err
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}
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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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return nil, errors.New("quicdialer: invalid IP representation")
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}
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pconn, err := d.QUICListener.Listen(&net.UDPAddr{IP: net.IPv4zero, Port: 0})
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if err != nil {
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return nil, err
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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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