one time auth server side

shadowsocks/shell.py

@@ -174,6 +174,8 @@ def get_config(is_local):
                 v_count += 1
                 # '-vv' turns on more verbose mode
                 config['verbose'] = v_count
+            elif key == '-a':
+                config['one_time_auth'] = True
             elif key == '-t':
                 config['timeout'] = int(value)
             elif key == '--fast-open':
@@ -315,6 +317,7 @@ Proxy options:
   -k PASSWORD            password
   -m METHOD              encryption method, default: aes-256-cfb
   -t TIMEOUT             timeout in seconds, default: 300
+  -a ONE_TIME_AUTH       one time auth
   --fast-open            use TCP_FASTOPEN, requires Linux 3.7+
   --workers WORKERS      number of workers, available on Unix/Linux
   --forbidden-ip IPLIST  comma seperated IP list forbidden to connect