mirror of
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59 lines
2.5 KiB
Python
59 lines
2.5 KiB
Python
from . import ProtocolHandler
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import select, socket
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from cStringIO import StringIO
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class TCPHandler(ProtocolHandler):
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"""
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TCPHandler acts as a generic TCP forwarder.
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Data will be .log()ed, but not stored any further.
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"""
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def handle_messages(self):
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conns = [self.c.client_conn.rfile, self.c.server_conn.rfile]
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while not self.c.close:
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r, _, _ = select.select(conns, [], [], 10)
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for rfile in r:
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if self.c.client_conn.rfile == rfile:
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src, dst = self.c.client_conn, self.c.server_conn
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direction = "-> tcp ->"
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dst_str = "%s:%s" % self.c.server_conn.address()[:2]
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else:
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dst, src = self.c.client_conn, self.c.server_conn
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direction = "<- tcp <-"
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dst_str = "client"
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data = StringIO()
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while range(4096):
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# Do non-blocking select() to see if there is further data on in the buffer.
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r, _, _ = select.select([rfile], [], [], 0)
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if len(r):
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d = rfile.read(1)
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if d == "": # connection closed
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break
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data.write(d)
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"""
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OpenSSL Connections have an internal buffer that might contain data altough everything is read
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from the socket. Thankfully, connection.pending() returns the amount of bytes in this buffer,
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so we can read it completely at once.
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"""
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if src.ssl_established:
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data.write(rfile.read(src.connection.pending()))
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else: # no data left, but not closed yet
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break
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data = data.getvalue()
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if data == "": # no data received, rfile is closed
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self.c.log("Close writing connection to %s" % dst_str)
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conns.remove(rfile)
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if dst.ssl_established:
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dst.connection.shutdown()
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else:
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dst.connection.shutdown(socket.SHUT_WR)
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if len(conns) == 0:
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self.c.close = True
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break
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self.c.log("%s %s\r\n%s" % (direction, dst_str,data))
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dst.wfile.write(data)
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dst.wfile.flush() |