150 lines
2.5 KiB
Go
150 lines
2.5 KiB
Go
package proxy
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import (
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"errors"
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"log"
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"net"
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"os"
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"os/signal"
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"sync"
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"syscall"
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"github.com/anon55555/mt"
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)
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// Run initializes the proxy andstarts the main listener loop.
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// It blocks forever.
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func Run() {
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if err := LoadConfig(); err != nil {
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log.Fatal("{←|⇶} ", err)
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}
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if !Conf().NoPlugins {
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loadPlugins()
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}
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var err error
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switch Conf().AuthBackend {
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case "sqlite3":
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setAuthBackend(authSQLite3{})
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default:
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log.Fatal("{←|⇶} invalid auth backend")
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}
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addr, err := net.ResolveUDPAddr("udp", Conf().BindAddr)
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if err != nil {
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log.Fatal("{←|⇶} ", err)
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}
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pc, err := net.ListenUDP("udp", addr)
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if err != nil {
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log.Fatal("{←|⇶} ", err)
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}
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l := listen(pc)
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defer l.Close()
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log.Print("{←|⇶} listen ", l.Addr())
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go func() {
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sig := make(chan os.Signal, 1)
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signal.Notify(sig, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP)
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<-sig
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clts := l.clients()
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var wg sync.WaitGroup
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wg.Add(len(clts))
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for cc := range clts {
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go func(cc *ClientConn) {
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ack, _ := cc.SendCmd(&mt.ToCltDisco{
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Reason: mt.Custom,
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Custom: "Proxy shutting down.",
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})
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select {
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case <-cc.Closed():
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case <-ack:
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cc.Close()
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}
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wg.Done()
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}(cc)
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}
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wg.Wait()
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os.Exit(0)
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}()
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for {
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cc, err := l.accept()
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if err != nil {
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if errors.Is(err, net.ErrClosed) {
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log.Print("{←|⇶} stop listening")
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break
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}
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log.Print("{←|⇶} ", err)
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continue
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}
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go func() {
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<-cc.Init()
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cc.Log("<->", "handshake completed")
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if len(Conf().Servers) == 0 {
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cc.Log("<--", "no servers")
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ack, _ := cc.SendCmd(&mt.ToCltDisco{
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Reason: mt.Custom,
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Custom: "No servers are configured.",
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})
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select {
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case <-cc.Closed():
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case <-ack:
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cc.Close()
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}
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return
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}
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addr, err := net.ResolveUDPAddr("udp", Conf().Servers[0].Addr)
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if err != nil {
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cc.Log("<--", "address resolution fail")
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ack, _ := cc.SendCmd(&mt.ToCltDisco{
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Reason: mt.Custom,
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Custom: "Server address resolution failed.",
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})
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select {
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case <-cc.Closed():
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case <-ack:
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cc.Close()
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}
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return
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}
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conn, err := net.DialUDP("udp", nil, addr)
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if err != nil {
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cc.Log("<--", "connection fail")
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ack, _ := cc.SendCmd(&mt.ToCltDisco{
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Reason: mt.Custom,
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Custom: "Server connection failed.",
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})
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select {
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case <-cc.Closed():
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case <-ack:
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cc.Close()
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}
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return
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}
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connect(conn, Conf().Servers[0].Name, cc)
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}()
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}
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select {}
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}
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