Add environment variable to configure max connection by ip

Dockerfile

@@ -1,7 +1,7 @@
 ## -*- docker-image-name: "mauler/simple-ftp-server" -*-
 
 FROM python:slim
-MAINTAINER Paulo <[email protected]>
+MAINTAINER EURANOVA <[email protected]>
 
 ENV FTP_ROOT /ftp-home
 ENV FTP_USER ftp

image/root/bin/simple-ftp-server

@@ -26,7 +26,7 @@ def main():
 
     # Specify a masquerade address and the range of ports to use for
     # passive connections.  Decomment in case you're behind a NAT.
-    # handler.masquerade_address = '151.25.42.11'
+    handler.masquerade_address = environ.get('FTP_MASQUERADE_ADDRESS', None)
     # handler.passive_ports = range(60000, 65535)
 
     # Instantiate FTP server class and listen on 0.0.0.0:2121
@@ -35,7 +35,7 @@ def main():
 
     # set a limit for connections
     server.max_cons = 256
-    server.max_cons_per_ip = 5
+    server.max_cons_per_ip = int(environ.get('FTP_MAX_CONS_PER_IP', '50'))
 
     # start ftp server
     server.serve_forever()