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from __future__ import absolute_import
import select, socket
from .primitives import ProtocolHandler
from netlib.utils import cleanBin
class TCPHandler(ProtocolHandler):
"""
TCPHandler acts as a generic TCP forwarder.
Data will be .log()ed, but not stored any further.
"""
chunk_size = 4096
def handle_messages(self):
self.c.establish_server_connection()
server = "%s:%s" % self.c.server_conn.address()[:2]
buf = memoryview(bytearray(self.chunk_size))
conns = [self.c.client_conn.rfile, self.c.server_conn.rfile]
while True:
r, _, _ = select.select(conns, [], [], 10)
for rfile in r:
if self.c.client_conn.rfile == rfile:
src, dst = self.c.client_conn, self.c.server_conn
direction = "-> tcp ->"
src_str, dst_str = "client", server
else:
dst, src = self.c.client_conn, self.c.server_conn
direction = "<- tcp <-"
dst_str, src_str = "client", server
closed = False
if src.ssl_established:
# Unfortunately, pyOpenSSL lacks a recv_into function.
contents = src.rfile.read(1) # We need to read a single byte before .pending() becomes usable
contents += src.rfile.read(src.connection.pending())
if not contents:
closed = True
else:
size = src.connection.recv_into(buf)
if not size:
closed = True
if closed:
conns.remove(src.rfile)
# Shutdown connection to the other peer
if dst.ssl_established:
dst.connection.shutdown()
else:
dst.connection.shutdown(socket.SHUT_WR)
if len(conns) == 0:
return
continue
if src.ssl_established or dst.ssl_established:
# if one of the peers is over SSL, we need to send bytes/strings
if not src.ssl_established: # only ssl to dst, i.e. we revc'd into buf but need bytes/string now.
contents = buf[:size].tobytes()
self.c.log("%s %s\r\n%s" % (direction, dst_str, cleanBin(contents)), "debug")
dst.connection.send(contents)
else:
# socket.socket.send supports raw bytearrays/memoryviews
self.c.log("%s %s\r\n%s" % (direction, dst_str, cleanBin(buf.tobytes())), "debug")
dst.connection.send(buf[:size])
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