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from .rawtcp import TcpLayer
from .tls import TlsLayer
class RootContext(object):
"""
The outmost context provided to the root layer.
As a consequence, every layer has .client_conn, .channel, .next_layer() and .config.
"""
def __init__(self, client_conn, config, channel):
self.client_conn = client_conn # Client Connection
self.channel = channel # provides .ask() method to communicate with FlowMaster
self.config = config # Proxy Configuration
def next_layer(self, top_layer):
"""
This function determines the next layer in the protocol stack.
:param top_layer: the current top layer
:return: The next layer.
"""
d = top_layer.client_conn.rfile.peek(1)
if not d:
return
# TLS ClientHello magic, see http://www.moserware.com/2009/06/first-few-milliseconds-of-https.html#client-hello
if d[0] == "\x16":
layer = TlsLayer(top_layer, True, True)
else:
layer = TcpLayer(top_layer)
return layer
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