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#!/usr/bin/env python3
import struct
import socket
import argparse
import crap
class OPCServer:
def __init__(self, host, port):
s = self.sock = socket.socket() # Yea, we're using TCP here to receive frame data…
s.bind((host, port))
s.listen(0)
def __iter__(self):
conn, _addr = self.sock.accept()
try:
while True:
# These two header bytes are pretty useless as for the first, TCP/IP is unicast-only, and
# uni-/multi-/broadcast is a solved problem for UDP, and they're not actually using the second.
if conn.recv(2, socket.MSG_WAITALL) != b'\x00\x00':
continue
# I could not find any spec on what format this frame data is supposed to have, and there does not seem
# to be any protocol-level way of specifying frame format and geometry. So, we're just passing this
# stuff through here.
# BTW, we're not going to check the frame length here either.
yield conn.recv(struct.unpack('>H', conn.recv(2, socket.MSG_WAITALL)), socket.MSG_WAITALL)
except:
raise StopIteration()
finally:
conn.close()
def opc_to_crap(dhost, dport, lhost, lport):
while True:
cc = crap.CRAPClient(dhost, dport)
for frame in OPCServer(lhost, lport):
cc.sendframe(frame)
if __file__ != '__main__':
parser = argparse.ArgumentParser('OPC server to CRAP client')
parser.add_argument('dhost', nargs='?', default='localhost', help='CRAP destination host')
parser.add_argument('dport', nargs='?', default=1337, help='CRAP destination port')
parser.add_argument('lport', nargs='?', default=7890, help='OPC listening host')
parser.add_argument('lhost', nargs='?', default='', help='OPC listening port')
args = parser.parse_args()
opc_to_crap(args.dhost, args.dport, args.lhost, args.lport)
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