Fixed #474

- Added automatic port check and reminder for beginners

src/mod/netutils/netutils.go

@@ -157,3 +157,13 @@ func resolveIpFromDomain(targetIpOrDomain string) string {
 
 	return targetIpAddrString
 }
+
+// Check if the given port is already used by another process
+func CheckIfPortOccupied(portNumber int) bool {
+	listener, err := net.Listen("tcp", ":"+strconv.Itoa(portNumber))
+	if err != nil {
+		return true
+	}
+	listener.Close()
+	return false
+}

src/reverseproxy.go

@@ -14,6 +14,7 @@ import (
 	"imuslab.com/zoraxy/mod/dynamicproxy/loadbalance"
 	"imuslab.com/zoraxy/mod/dynamicproxy/permissionpolicy"
 	"imuslab.com/zoraxy/mod/dynamicproxy/rewrite"
+	"imuslab.com/zoraxy/mod/netutils"
 	"imuslab.com/zoraxy/mod/uptime"
 	"imuslab.com/zoraxy/mod/utils"
 )
@@ -28,10 +29,22 @@ func ReverseProxtInit() {
 		Load Reverse Proxy Global Settings
 	*/
 	inboundPort := 443
+	autoStartReverseProxy := true
 	if sysdb.KeyExists("settings", "inbound") {
+		//Read settings from database
 		sysdb.Read("settings", "inbound", &inboundPort)
-		SystemWideLogger.Println("Serving inbound port ", inboundPort)
+		if netutils.CheckIfPortOccupied(inboundPort) {
+			autoStartReverseProxy = false
+			SystemWideLogger.Println("Inbound port ", inboundPort, " is occupied. Change the listening port in the webmin panel and press \"Start Service\" to start reverse proxy service")
+		} else {
+			SystemWideLogger.Println("Serving inbound port ", inboundPort)
+		}
 	} else {
+		//Default port
+		if netutils.CheckIfPortOccupied(inboundPort) {
+			inboundPort = 8743
+			SystemWideLogger.Println("Port 443 is occupied. Switching to backup port 8743 instead")
+		}
 		SystemWideLogger.Println("Inbound port not set. Using default (443)")
 	}
 
@@ -60,6 +73,9 @@ func ReverseProxtInit() {
 	}
 
 	listenOnPort80 := true
+	if netutils.CheckIfPortOccupied(80) {
+		listenOnPort80 = false
+	}
 	sysdb.Read("settings", "listenP80", &listenOnPort80)
 	if listenOnPort80 {
 		SystemWideLogger.Println("Port 80 listener enabled")
@@ -136,9 +152,11 @@ func ReverseProxtInit() {
 	//Start Service
 	//Not sure why but delay must be added if you have another
 	//reverse proxy server in front of this service
-	time.Sleep(300 * time.Millisecond)
-	dynamicProxyRouter.StartProxyService()
-	SystemWideLogger.Println("Dynamic Reverse Proxy service started")
+	if autoStartReverseProxy {
+		time.Sleep(300 * time.Millisecond)
+		dynamicProxyRouter.StartProxyService()
+		SystemWideLogger.Println("Dynamic Reverse Proxy service started")
+	}
 
 	//Add all proxy services to uptime monitor
 	//Create a uptime monitor service