cli: Rename the env vars for the params

It also shortens the command-line argument in exec.sh

#4 - Investigate extending pr0xy to use SAM

contained/bin/trans_proxy/cli.py

@@ -28,9 +28,10 @@ from trans_proxy import fake_dns
 from trans_proxy.process import AsyncProcess
 from trans_proxy.servers import ClientTcpTunnel
 
-ENV_SAM_HOST = "I2P_SAM_HOST"
-ENV_SAM_PORT = "I2P_SAM_PORT"
-ENV_DNS_PORT = "I2P_DNS_PORT"
+ENV_PORT = "PROXY_PORT"
+ENV_SAM_HOST = "PROXY_SAM_HOST"
+ENV_SAM_PORT = "PROXY_SAM_PORT"
+ENV_DNS_PORT = "PROXY_DNS_PORT"
 
 logger = logging.getLogger("trans_proxy")
 
@@ -45,7 +46,7 @@ def main():
         help="Activates verbose logs")
     parser.add_argument(
         "-p", "--port",
-        default=1234,
+        default=os.environ.get(ENV_PORT, 1234),
         type=int,
         help="Where all traffic should enter to be forwarded")
     parser.add_argument(