99 lines
1.8 KiB
Go
99 lines
1.8 KiB
Go
package udp
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import (
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"context"
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"log"
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"mpbl3p/proxy"
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"net"
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"time"
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)
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type ComparableUdpAddress struct {
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IP [16]byte
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Port int
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Zone string
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}
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func fromUdpAddress(address net.UDPAddr) ComparableUdpAddress {
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var ip [16]byte
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for i, b := range []byte(address.IP) {
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ip[i] = b
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}
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return ComparableUdpAddress{
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IP: ip,
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Port: address.Port,
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Zone: address.Zone,
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}
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}
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func NewListener(ctx context.Context, p *proxy.Proxy, local string, v func() proxy.MacVerifier, g func() proxy.MacGenerator, c func() Congestion) error {
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laddr, err := net.ResolveUDPAddr("udp", local)
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if err != nil {
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return err
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}
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pconn, err := net.ListenUDP("udp", laddr)
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if err != nil {
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return err
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}
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receivedConnections := make(map[ComparableUdpAddress]*Flow)
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go func() {
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for ctx.Err() == nil {
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buf := make([]byte, 6000)
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if err := pconn.SetReadDeadline(time.Now().Add(time.Second)); err != nil {
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panic(err)
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}
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n, addr, err := pconn.ReadFromUDP(buf)
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if err != nil {
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if e, ok := err.(net.Error); ok && e.Timeout() {
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continue
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}
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panic(err)
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}
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// TODO: Support congestion exchange here
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raddr := fromUdpAddress(*addr)
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if f, exists := receivedConnections[raddr]; exists {
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log.Println("existing flow. queuing...")
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if err := f.queueDatagram(ctx, buf[:n]); err != nil {
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log.Println("error")
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continue
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}
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log.Println("queued")
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continue
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}
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v := v()
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g := g()
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f := newFlow(c(), v)
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f.writer = pconn
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f.raddr = addr
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f.isAlive = true
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log.Printf("received new udp connection: %v\n", f)
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go f.earlyUpdateLoop(ctx, g, 0)
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receivedConnections[raddr] = &f
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p.AddConsumer(ctx, &f, g)
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p.AddProducer(ctx, &f, v)
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log.Println("handling...")
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if err := f.queueDatagram(ctx, buf[:n]); err != nil {
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return
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}
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log.Println("handled")
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}
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}()
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return nil
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}
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