provide option to allow server tunnel creation without having to create a directory for key storage

README.md

@@ -85,26 +85,26 @@ Note that it may take a short while for new tunnels to be set up.
 
 Call the `dist/linux/router/bin/tunnel-control.sh` script as follows to create and destroy tunnels:
 
-#### Listen for i2p connections and forward them to the specified host and port, storing/reading the server key file in/from the specified directory.
+#### Listen for I2P connections and forward them to the specified host and port. Returns the I2P base 32 destination address for the server tunnel created.
 
-If the directory doesn't exist with a file named serverTunnelSecretKey in it,
+Optionally, specify a directory for storing/reading the server key file.
+If the directory doesn't exist with a file named *.b32.i2p.keys in it,
 returns a newly created destination address and writes the secret key for the
-new address to a file called serverTunnelSecretKey in the specified directory. Otherwise, read the existing
-secret key from that directory. The server tunnel will listen for i2p connections and forward them to the
-specified host and port. Returns the I2P b32 destination address for the server tunnel (which deterministically depends
- on the contents of the serverTunnelSecretKey file).
+new address to a file called <I2P dest addr>.keys in the specified directory. Otherwise, read the existing
+secret key from that directory. The server tunnel will listen for I2P connections and forward them to the
+specified host and port. Note that the base 32 I2P destination address deterministically depends on the contents of the .keys file).
 
-`tunnel-control.sh server.create <host> <port> <directory>`
+`tunnel-control.sh server.create <host> <port> <(optional) directory>`
 
 
 #### Close the tunnel listening for connections on the specified destination public key. Returns "OK".
 
-`tunnel-control.sh server.destroy <i2p destination public key>`
+`tunnel-control.sh server.destroy <I2P destination public key>`
 
 
 #### Create a tunnel that listens for connections on localhost on the specified port and forwards connections over I2P to the specified destination public key.
 
-`tunnel-control.sh client.create <local port> <i2p destination public key>`
+`tunnel-control.sh client.create <local port> <I2P destination public key>`
 
 
 #### Close the tunnel listening for connections on the specified port. Returns "OK".

org.getmonero.i2p.zero/src/org/getmonero/i2p/zero/TunnelControl.java

@@ -310,17 +310,23 @@ public class TunnelControl implements Runnable {
             case "server.create": {
               String destHost = args[1];
               int destPort = Integer.parseInt(args[2]);
-              File serverTunnelConfigDir = new File(args[3]);
+              File serverTunnelConfigDir = null;
+              if(args.length>=4) serverTunnelConfigDir = new File(args[3]);
               File serverKeyFile;
               KeyPair keyPair;
-              if (!serverTunnelConfigDir.exists() || serverTunnelConfigDir.listFiles((dir, name) -> name.toLowerCase().endsWith(".keys")).length == 0) {
-                serverTunnelConfigDir.mkdir();
+              if(serverTunnelConfigDir!=null) {
+                if (!serverTunnelConfigDir.exists() || serverTunnelConfigDir.listFiles((dir, name) -> name.toLowerCase().endsWith(".keys")).length == 0) {
+                  serverTunnelConfigDir.mkdir();
+                  keyPair = KeyPair.gen();
+                  serverKeyFile = new File(serverTunnelConfigDir, keyPair.b32Dest + ".keys");
+                  keyPair.write(serverKeyFile.getPath());
+                } else {
+                  serverKeyFile = serverTunnelConfigDir.listFiles((dir, name) -> name.toLowerCase().endsWith(".keys"))[0];
+                  keyPair = KeyPair.read(serverKeyFile.getPath());
+                }
+              }
+              else {
                 keyPair = KeyPair.gen();
-                serverKeyFile = new File(serverTunnelConfigDir, keyPair.b32Dest + ".keys");
-                keyPair.write(serverKeyFile.getPath());
-              } else {
-                serverKeyFile = serverTunnelConfigDir.listFiles((dir, name) -> name.toLowerCase().endsWith(".keys"))[0];
-                keyPair = KeyPair.read(serverKeyFile.getPath());
               }
               var tunnel = new ServerTunnel(destHost, destPort, keyPair, getTunnelControlTempDir());
               tunnelList.addTunnel(tunnel);