TLS + SIP Mitm

[Gao Hui]

I want to use mitm_relay + burpsuite to intercept my root andriod rcs messages.
I configure Android using the ip of linux running mitm_relay and burpsuite as router ip. (the provider's rcs service port is 5260)
And I use iptables to redirect tcp to 5261 port (from 5260) locally.
Then error occured:
---------------------- Wrapping sockets ----------------------
Exception in thread Thread-8:
Traceback (most recent call last):
File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
self.run()
File "/usr/lib/python3.8/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "mitm_relay.py", line 419, in handle_tcp_client
do_relay_tcp(client_sock, server_sock, cfg)
File "mitm_relay.py", line 301, in do_relay_tcp
receiving, _, _ = select([client_sock, server_sock], [], [])
ValueError: file descriptor cannot be a negative integer (-1)
Exiting...