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|
package proxy
import (
"errors"
"log"
"net"
"os"
"os/signal"
"sync"
"syscall"
)
var runOnce sync.Once
// Run initializes the proxy and starts the main listener loop.
// It blocks forever.
func Run() {
runOnce.Do(runFunc)
}
func runFunc() {
if !Conf().NoPlugins {
loadPlugins()
}
var err error
switch Conf().AuthBackend {
case "files":
setAuthBackend(authFiles{})
default:
log.Fatal("invalid auth backend")
}
if !Conf().NoTelnet {
go func() {
if err := telnetServer(); err != nil {
log.Fatal(err)
}
}()
}
addr, err := net.ResolveUDPAddr("udp", Conf().BindAddr)
if err != nil {
log.Fatal(err)
}
pc, err := net.ListenUDP("udp", addr)
if err != nil {
log.Fatal(err)
}
l := listen(pc)
defer l.Close()
log.Println("listen", l.Addr())
go func() {
sig := make(chan os.Signal, 1)
signal.Notify(sig, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP)
<-sig
close(telnetCh)
if Conf().List.Enable {
if err := announce(listRm); err != nil {
log.Print(err)
}
}
clts := Clts()
var wg sync.WaitGroup
wg.Add(len(clts))
for cc := range clts {
go func(cc *ClientConn) {
cc.Kick("Proxy shutting down.")
<-cc.Closed()
wg.Done()
}(cc)
}
wg.Wait()
os.Exit(0)
}()
for {
cc, err := l.accept()
if err != nil {
if errors.Is(err, net.ErrClosed) {
log.Print("stop listening")
break
}
log.Print(err)
continue
}
go func() {
<-cc.Init()
cc.Log("<->", "handshake completed")
srvs := Conf().Servers
if len(srvs) == 0 {
cc.Log("<-", "no servers")
cc.Kick("No servers are configured.")
return
}
srv := srvs[0]
lastSrv, err := authIface.LastSrv(cc.Name())
if err == nil && !Conf().ForceDefaultSrv && lastSrv != srv.Name {
for _, v := range srvs {
if v.Name == lastSrv {
srv = v
break
}
}
}
addr, err := net.ResolveUDPAddr("udp", srv.Addr)
if err != nil {
cc.Log("<-", "address resolution fail")
cc.Kick("Server address resolution failed.")
return
}
conn, err := net.DialUDP("udp", nil, addr)
if err != nil {
cc.Log("<-", "connection fail")
cc.Kick("Server connection failed.")
return
}
connect(conn, srv.Name, cc)
}()
}
select {}
}
|
