From b21345fba99d38c5e5ade695e32fc9e23ea48e98 Mon Sep 17 00:00:00 2001
From: HimbeerserverDE <himbeerserverde@gmail.com>
Date: Fri, 27 Aug 2021 18:59:27 +0200
Subject: Basic authentication server and content multiplexer

---
 main.go | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 main.go

(limited to 'main.go')

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..74ba45b
--- /dev/null
+++ b/main.go
@@ -0,0 +1,94 @@
+package main
+
+import (
+	"errors"
+	"log"
+	"net"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+
+	"github.com/anon55555/mt"
+)
+
+func main() {
+	if err := loadConfig(); err != nil {
+		log.Fatal("{←|⇶} ", err)
+	}
+
+	var err error
+	switch conf.AuthBackend {
+	case "sqlite3":
+		authIface = authSQLite3{}
+	default:
+		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.Print("{←|⇶} listening on ", l.addr())
+
+	clts := make(map[*clientConn]struct{})
+	var mu sync.Mutex
+
+	go func() {
+		sig := make(chan os.Signal)
+		signal.Notify(sig, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP)
+		<-sig
+
+		mu.Lock()
+		defer mu.Unlock()
+
+		for cc := range clts {
+			ack, _ := cc.SendCmd(&mt.ToCltDisco{Reason: mt.Shutdown})
+			<-ack
+			cc.Close()
+		}
+
+		os.Exit(0)
+	}()
+
+	for {
+		cc, err := l.accept()
+		if err != nil {
+			if errors.Is(err, net.ErrClosed) {
+				break
+			}
+
+			log.Print("{←|⇶} ", err)
+			continue
+		}
+
+		mu.Lock()
+		clts[cc] = struct{}{}
+		mu.Unlock()
+
+		go func() {
+			<-cc.Closed()
+
+			mu.Lock()
+			defer mu.Unlock()
+
+			delete(clts, cc)
+		}()
+
+		go func() {
+			<-cc.init()
+			cc.log("<->", "handshake completed")
+			// ToDo: establish serverConn
+			// and start handler goroutines
+		}()
+	}
+}
-- 
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