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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()
}
authBackendName := Conf().AuthBackend
switch authBackendName {
case "files":
setAuthBackend(AuthFiles{})
case "mtsqlite3":
ab, err := NewAuthMTSQLite3()
if err != nil {
log.Fatal(err)
}
setAuthBackend(ab)
case "mtpostgresql":
ab, err := NewAuthMTPostgreSQL(Conf().AuthPostgresConn)
if err != nil {
log.Fatal(err)
}
setAuthBackend(ab)
case "":
log.Fatal("invalid auth backend")
default:
if ab, ok := authBackends[authBackendName]; ok {
setAuthBackend(ab)
} else {
log.Fatal("invalid auth backend")
}
}
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
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) {
sc := cc.server()
cc.Kick("Proxy shutting down.")
<-cc.Closed()
if sc != nil {
<-sc.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")
conf := Conf()
if len(conf.Servers) == 0 {
cc.Log("<-", "no servers")
cc.Kick("No servers are configured.")
return
}
if _, ok := conf.Servers[""]; !ok && conf.DefaultServerName() == "" {
cc.Log("<-", "no default server")
cc.Kick("No valid default server is configured.")
return
}
srvName, srv := conf.DefaultServerInfo()
lastSrv, err := DefaultAuth().LastSrv(cc.Name())
if err == nil && !conf.ForceDefaultSrv && lastSrv != srvName {
choice, ok := conf.RandomGroupServer(lastSrv)
if !ok {
cc.Log("<-", "inexistent previous server")
}
srvName = choice
srv, _ = conf.Servers[choice] // Existence already checked.
}
doConnect := func(srvName string, srv Server) error {
addr, err := net.ResolveUDPAddr("udp", srv.Addr)
if err != nil {
cc.Log("<-", "address resolution fail")
// cc.Kick("Server address resolution failed.")
return err
}
conn, err := net.DialUDP("udp", nil, addr)
if err != nil {
cc.Log("<-", "connection fail")
// cc.Kick("Server connection failed.")
return err
}
connect(conn, srvName, cc)
return nil
}
if err := doConnect(srvName, srv); err != nil {
cc.Log("<-", err)
cc.SendChatMsg("Could not connect, trying fallback server. Error:", err)
fbName := srv.Fallback
for fbName != "" {
var ok bool
srv, ok = conf.Servers[fbName]
if !ok {
cc.Log("<-", "invalid fallback")
continue
}
if err := doConnect(fbName, srv); err != nil {
fbName = srv.Fallback
cc.Log("<-", err)
cc.SendChatMsg("Could not connect, trying next fallback server. Error:", err.Error())
} else {
break
}
}
}
}()
}
select {}
}
|
