mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-27 02:24:18 +00:00
94 lines
3.5 KiB
Python
94 lines
3.5 KiB
Python
from __future__ import (absolute_import, print_function, division)
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from netlib.http.http1 import HTTP1Protocol
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from netlib.http.http2 import HTTP2Protocol
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from ..protocol import (
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RawTCPLayer, TlsLayer, Http1Layer, Http2Layer, is_tls_record_magic, ServerConnectionMixin
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)
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from .modes import HttpProxy, HttpUpstreamProxy, ReverseProxy
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class RootContext(object):
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"""
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The outmost context provided to the root layer.
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As a consequence, every layer has .client_conn, .channel, .next_layer() and .config.
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"""
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def __init__(self, client_conn, config, channel):
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self.client_conn = client_conn # Client Connection
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self.channel = channel # provides .ask() method to communicate with FlowMaster
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self.config = config # Proxy Configuration
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def next_layer(self, top_layer):
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"""
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This function determines the next layer in the protocol stack.
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Arguments:
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top_layer: the current top layer.
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Returns:
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The next layer
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"""
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# 1. Check for --ignore.
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if self.config.check_ignore(top_layer.server_conn.address):
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return RawTCPLayer(top_layer, logging=False)
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d = top_layer.client_conn.rfile.peek(3)
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client_tls = is_tls_record_magic(d)
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# 2. Always insert a TLS layer, even if there's neither client nor server tls.
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# An inline script may upgrade from http to https,
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# in which case we need some form of TLS layer.
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if isinstance(top_layer, ReverseProxy):
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return TlsLayer(top_layer, client_tls, top_layer.server_tls)
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if isinstance(top_layer, ServerConnectionMixin):
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return TlsLayer(top_layer, client_tls, client_tls)
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# 3. In Http Proxy mode and Upstream Proxy mode, the next layer is fixed.
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if isinstance(top_layer, TlsLayer):
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if isinstance(top_layer.ctx, HttpProxy):
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return Http1Layer(top_layer, "regular")
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if isinstance(top_layer.ctx, HttpUpstreamProxy):
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return Http1Layer(top_layer, "upstream")
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# 4. Check for other TLS cases (e.g. after CONNECT).
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if client_tls:
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return TlsLayer(top_layer, True, True)
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# 4. Check for --tcp
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if self.config.check_tcp(top_layer.server_conn.address):
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return RawTCPLayer(top_layer)
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# 5. Check for TLS ALPN (HTTP1/HTTP2)
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if isinstance(top_layer, TlsLayer):
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alpn = top_layer.client_conn.get_alpn_proto_negotiated()
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if alpn == HTTP2Protocol.ALPN_PROTO_H2:
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return Http2Layer(top_layer, 'transparent')
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if alpn == HTTP1Protocol.ALPN_PROTO_HTTP1:
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return Http1Layer(top_layer, 'transparent')
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# 6. Assume HTTP1 by default
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return Http1Layer(top_layer, 'transparent')
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# In a future version, we want to implement TCP passthrough as the last fallback,
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# but we don't have the UI part ready for that.
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#
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# d = top_layer.client_conn.rfile.peek(3)
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# is_ascii = (
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# len(d) == 3 and
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# # better be safe here and don't expect uppercase...
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# all(x in string.ascii_letters for x in d)
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# )
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# # TODO: This could block if there are not enough bytes available?
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# d = top_layer.client_conn.rfile.peek(len(HTTP2Protocol.CLIENT_CONNECTION_PREFACE))
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# is_http2_magic = (d == HTTP2Protocol.CLIENT_CONNECTION_PREFACE)
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@property
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def layers(self):
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return []
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def __repr__(self):
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return "RootContext"
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