Allow forwarding of multiple ports

flake.nix

@@ -48,12 +48,16 @@
                 type = bool;
                 default = true;
               };
-              proto = mkOption {type = proto;};
-              dest = mkOption {type = str;};
-              hostProto = mkOption {type = proto;};
-              port = mkOption {type = port;};
+              forwards = mkOption {
+                type = listOf (submodule {
+                  options = {
+                    proto = mkOption {type = proto;};
+                    port = mkOption {type = port;};
+                    dest = mkOption {type = str;};
+                  };
+                });
+              };
             };
-            config.hostProto = mkDefault config.proto;
           }));
         };
       };
@@ -65,10 +69,7 @@
         };
       in
         lib.mapAttrs' (hostname: {
-          proto,
-          hostProto,
-          port,
-          dest,
+          forwards,
           enable,
           ...
         }: let
@@ -78,7 +79,7 @@
           value = {
             inherit enable;
             script = ''
-              TS_AUTHKEY=$(cat $RUNTIME_DIRECTORY/authkey) ${lib.getExe self.packages.${pkgs.system}.default} ${hostProto} ${hostname} ${toString port} ${proto} ${dest}
+              TS_AUTHKEY=$(cat $RUNTIME_DIRECTORY/authkey) ${lib.getExe self.packages.${pkgs.system}.default} ${hostname} ${lib.concatMapStringsSep " " ({proto, port, dest}: "${proto}:${port}:${dest}") forwards}
             '';
             wantedBy = ["multi-user.target"];
             serviceConfig = {

main.go

@@ -5,30 +5,45 @@ import (
 	"log"
 	"net"
 	"os"
+	"strings"
 
 	"ben.soroos.net/tsnet-proxy/netforward"
 	"tailscale.com/tsnet"
 )
 
-var (
-	host_proto = os.Args[1]
-	hostname   = os.Args[2]
-	host_port  = os.Args[3]
-	dst_proto  = os.Args[4]
-	dst_addr   = os.Args[5]
-)
+var hostname = os.Args[1]
 
-type Dialer struct{}
+
+type Dialer struct{
+	proto string;
+	addr string;
+}
+
+type Forward struct{
+	proto string;
+	port string;
+	dst string;
+}
 
 func (dialer Dialer) Dial() (net.Conn, error) {
-	return net.Dial(dst_proto, dst_addr)
+	return net.Dial(dialer.proto, dialer.addr)
+}
+
+func (forward Forward) Run(server *tsnet.Server, finish chan error) {
+	ln, err := server.Listen(forward.proto, fmt.Sprint(":", forward.port))
+	defer ln.Close()
+	if err != nil {
+		finish <- err
+	}
+	err = netforward.Forward(Dialer { proto: forward.proto, addr: forward.dst }, ln)
+	if err != nil {
+		finish <- err
+	}
 }
 
 func main() {
-	if !(host_proto != "" && hostname != "" && host_port != "" && dst_proto != "" && dst_addr != "") {
-		fmt.Println("Usage: tsnet-proxy PROTO HOSTNAME PORT DST-PROTO DST")
-		fmt.Println("Where PROTO is one of tcp, udp, unix")
-		fmt.Println("Got: ", host_proto, hostname, host_port, dst_proto, dst_addr)
+	if !(hostname != "") {
+		fmt.Println("Usage: tsnet-proxy HOSTNAME FORWARDS...")
 		os.Exit(1)
 	}
 
@@ -42,11 +57,14 @@ func main() {
 	}
 	defer s.Close()
 
-	ln, err := s.Listen(host_proto, fmt.Sprint(":", host_port))
-	if err != nil {
-		log.Fatal(err)
+	err_chan := make(chan error)
+	for _, arg := range os.Args[2:] {
+		args := strings.SplitN(arg, ":", 3)
+		proto, port, dst := args[0], args[1], args[2]
+		go func() {
+			Forward { proto, port, dst }.Run(s, err_chan);
+		}();
 	}
-	defer ln.Close()
-
-	netforward.Forward(Dialer {}, ln)
+	err := <- err_chan 
+	log.Fatal(err)
 }