nc.py

import sys
import os
import termios
import tty

from fswait import fswait

telnet_mode = False

i = 1
while sys.argv[i].startswith('-'):
	if sys.argv[i] == '-t':
		# Telnet mode
		telnet_mode = True
	i += 1

if telnet_mode:
	fd = sys.stdin.fileno()
	new = termios.tcgetattr(fd)
	new[3] &= ~termios.ECHO
	termios.tcsetattr(fd, termios.TCSANOW, new)
	tty.setraw(fd)


with open(f'/dev/net/{sys.argv[i]}:{sys.argv[i+1]}','br+') as f:
	while 1:
		r = fswait([f, sys.stdin])
		if r == 0:
			data = os.read(f.fileno(), 1024)
			os.write(sys.stdout.fileno(), data)
			sys.stdout.flush()
		elif r == 1:
			data = os.read(sys.stdin.fileno(), 1024)
			if not data:
				break
			if data == '\003':
				break
			if telnet_mode:
				data = data.replace(b'\n',b'\r\n')
			os.write(f.fileno(), data)
			f.flush()