From c941ec541ee9edc81e99708d9c000d65f8d1d812 Mon Sep 17 00:00:00 2001
From: Jeff Carr <jcarr@wit.com>
Date: Tue, 11 Mar 2025 10:26:46 -0500
Subject: [PATCH] more phansastic gus

---
 main.go | 98 ++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 80 insertions(+), 18 deletions(-)

diff --git a/main.go b/main.go
index d770790..889df91 100644
--- a/main.go
+++ b/main.go
@@ -4,11 +4,14 @@
 package main
 
 import (
+	"bufio"
 	"embed"
 	"fmt"
 	"io"
 	"net"
 	"os"
+	"strings"
+	sync "sync"
 	"time"
 
 	"github.com/google/uuid"
@@ -98,18 +101,47 @@ func doME(pm *Portmap, gus net.Listener) {
 		log.Info("Listening on ", s)
 	*/
 
-	// Accept incoming connection
-	clientConn, err := gus.Accept()
-	if err != nil {
-		log.Printf("Failed to accept client connection: %v", err)
-		return
-	}
-	// log.Printf("Client connected: %s", clientConn.RemoteAddr())
+	for {
+		// Accept incoming connection
+		src, err := gus.Accept()
+		if err != nil {
+			log.Printf("Failed to accept client connection: %v\n", err)
+			return
+		}
 
-	// make a new event from this new connection
-	log.Printf("Connected on port %d from client: %s to where = %s\n", localport, clientConn.RemoteAddr(), where)
-	// Handle the connection in a separate goroutine
-	// go handleConnection(clientConn, connect, port)
+		// make a new event from this new connection
+		log.Printf("/me Connected on port %d from client: %s to where = %s\n", localport, src.RemoteAddr(), where)
+		fmt.Fprintln(src, "/me hello")
+
+		reader := bufio.NewReader(src)
+
+		// Read one line
+		line, err := reader.ReadString('\n')
+		if err != nil {
+			log.Info("Error reading line:", err)
+			return
+		}
+		log.Info("gus got Received:", line)
+		parts := strings.Fields(line)
+		if len(parts) != 3 {
+			return
+		}
+		if parts[0] != "/me" {
+			return
+		}
+		if parts[1] != "hostname" {
+			return
+		}
+		hostname := parts[2]
+		msg := fmt.Sprintf("got hostname %s for %s", hostname, src.RemoteAddr())
+		log.Info("gus:", msg)
+		fmt.Fprintln(src, msg)
+
+		if hostname == "framebook.wit.com" {
+			// Handle the connection in a separate goroutine
+			go handleConnection(src, pm.Dest, int(pm.Localport))
+		}
+	}
 }
 
 func gus3000(pm *Portmap) {
@@ -169,8 +201,9 @@ func handleConnection(clientConn net.Conn, where string, localport int) {
 	me.eventsChanged = true
 
 	// Bidirectional copy of data
-	go io.Copy(targetConn, clientConn) // Client -> Target
-	io.Copy(clientConn, targetConn)    // Target -> Client
+	// go io.Copy(targetConn, clientConn) // Client -> Target
+	// io.Copy(clientConn, targetConn)    // Target -> Client
+	ioCopy(clientConn, targetConn)
 
 	// if the socket closes, record the close time
 	e.Etime = timestamppb.New(time.Now())
@@ -179,17 +212,46 @@ func handleConnection(clientConn net.Conn, where string, localport int) {
 }
 
 func enablePort(port int, dest string) {
+	var found bool
 	all := me.portmaps.All()
 	for all.Scan() {
 		pm := all.Next()
 		if int(pm.Localport) == port {
+			found = true
 			log.Info("Found port!", port)
-		}
-		if pm.Enabled {
-			log.Info("portmap already enabled for", pm.Localport, "to", pm.Dest)
-		} else {
-			log.Info("portmap not enabled for", pm.Localport, "to", pm.Dest)
+			if pm.Enabled {
+				log.Info("portmap already enabled for", pm.Localport, "to", pm.Dest)
+			} else {
+				log.Info("portmap not enabled for", pm.Localport, "to", pm.Dest)
+			}
 		}
 		// go gus3000(pm)
 	}
+	if !found {
+		log.Info("Did not find port =", port)
+	}
+}
+
+// should cleanly close both
+func ioCopy(clientConn, targetConn net.Conn) {
+	defer clientConn.Close()
+	defer targetConn.Close()
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+
+	// Copy data in both directions
+	go func() {
+		defer wg.Done()
+		io.Copy(targetConn, clientConn) // Client -> Target
+		targetConn.Close()              // Ensure closure on EOF/error
+	}()
+
+	go func() {
+		defer wg.Done()
+		io.Copy(clientConn, targetConn) // Target -> Client
+		clientConn.Close()              // Ensure closure on EOF/error
+	}()
+
+	wg.Wait() // Wait for both copies to complete
 }