mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-27 02:24:18 +00:00
321 lines
8.5 KiB
Python
321 lines
8.5 KiB
Python
"""
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This module provides more sophisticated flow tracking. These match requests
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with their responses, and provide filtering and interception facilities.
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"""
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import subprocess, base64, sys, json
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import proxy, threading, netstring
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import controller
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class RunException(Exception):
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def __init__(self, msg, returncode, errout):
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Exception.__init__(self, msg)
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self.returncode = returncode
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self.errout = errout
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# begin nocover
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class ReplayThread(threading.Thread):
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def __init__(self, flow, masterq):
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self.flow, self.masterq = flow, masterq
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threading.Thread.__init__(self)
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def run(self):
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try:
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server = proxy.ServerConnection(self.flow.request)
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server.send_request(self.flow.request)
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response = server.read_response()
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response.send(self.masterq)
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except proxy.ProxyError, v:
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err = proxy.Error(self.flow.client_conn, v.msg)
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err.send(self.masterq)
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# end nocover
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class Flow:
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def __init__(self, request):
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self.request = request
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self.response, self.error = None, None
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self.intercepting = False
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self._backup = None
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def script_serialize(self):
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data = self.get_state()
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return json.dumps(data)
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@classmethod
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def script_deserialize(klass, data):
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try:
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data = json.loads(data)
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except Exception:
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return None
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return klass.from_state(data)
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def run_script(self, path):
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"""
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Run a script on a flow.
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Returns a (flow, stderr output) tuple, or raises RunException if
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there's an error.
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"""
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self.backup()
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data = self.script_serialize()
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try:
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p = subprocess.Popen(
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[path],
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stdout=subprocess.PIPE,
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stdin=subprocess.PIPE,
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stderr=subprocess.PIPE,
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)
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except OSError, e:
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raise RunException(e.args[1], None, None)
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so, se = p.communicate(data)
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if p.returncode:
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raise RunException(
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"Script returned error code %s"%p.returncode,
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p.returncode,
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se
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)
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f = Flow.script_deserialize(so)
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if not f:
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raise RunException(
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"Invalid response from script.",
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p.returncode,
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se
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)
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self.load_state(f.get_state())
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return se
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def get_state(self, nobackup=False):
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d = dict(
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request = self.request.get_state() if self.request else None,
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response = self.response.get_state() if self.response else None,
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error = self.error.get_state() if self.error else None,
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)
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if nobackup:
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d["backup"] = None
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else:
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d["backup"] = self._backup
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return d
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def load_state(self, state):
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self._backup = state["backup"]
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self.request = proxy.Request.from_state(state["request"])
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if state["response"]:
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self.response = proxy.Response.from_state(self.request, state["response"])
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if state["error"]:
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self.error = proxy.Error.from_state(state["error"])
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@classmethod
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def from_state(klass, state):
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f = klass(None)
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f.load_state(state)
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return f
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def __eq__(self, other):
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return self.get_state() == other.get_state()
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def modified(self):
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# FIXME: Save a serialization in backup, compare current with
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# backup to detect if flow has _really_ been modified.
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if self._backup:
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return True
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else:
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return False
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def backup(self):
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self._backup = self.get_state(nobackup=True)
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def revert(self):
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if self._backup:
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self.load_state(self._backup)
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self._backup = None
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def match(self, pattern):
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if pattern:
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if self.response:
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return pattern(self.response)
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elif self.request:
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return pattern(self.request)
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return False
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def kill(self):
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if self.request and not self.request.acked:
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self.request.ack(None)
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elif self.response and not self.response.acked:
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self.response.ack(None)
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self.intercepting = False
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def intercept(self):
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self.intercepting = True
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def accept_intercept(self):
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if self.request:
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if not self.request.acked:
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self.request.ack()
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elif self.response and not self.response.acked:
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self.response.ack()
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self.intercepting = False
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class State:
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def __init__(self):
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self.client_connections = []
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self.flow_map = {}
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self.flow_list = []
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# These are compiled filt expressions:
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self.limit = None
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self.intercept = None
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def clientconnect(self, cc):
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self.client_connections.append(cc)
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def clientdisconnect(self, dc):
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"""
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Start a browser connection.
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"""
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self.client_connections.remove(dc.client_conn)
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def add_request(self, req):
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"""
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Add a request to the state. Returns the matching flow.
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"""
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f = Flow(req)
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self.flow_list.insert(0, f)
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self.flow_map[req] = f
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return f
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def add_response(self, resp):
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"""
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Add a response to the state. Returns the matching flow.
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"""
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f = self.flow_map.get(resp.request)
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if not f:
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return False
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f.response = resp
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return f
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def add_error(self, err):
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"""
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Add an error response to the state. Returns the matching flow, or
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None if there isn't one.
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"""
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f = self.flow_map.get(err.flow.request)
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if not f:
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return None
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f.error = err
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return f
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def load_flows(self, flows):
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self.flow_list.extend(flows)
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for i in flows:
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self.flow_map[i.request] = i
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def set_limit(self, limit):
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"""
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Limit is a compiled filter expression, or None.
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"""
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self.limit = limit
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@property
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def view(self):
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if self.limit:
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return tuple([i for i in self.flow_list if i.match(self.limit)])
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else:
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return tuple(self.flow_list[:])
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def delete_flow(self, f):
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if not f.intercepting:
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if f.request in self.flow_map:
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del self.flow_map[f.request]
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self.flow_list.remove(f)
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return True
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return False
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def clear(self):
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for i in self.flow_list[:]:
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self.delete_flow(i)
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def accept_all(self):
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for i in self.flow_list[:]:
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i.accept_intercept()
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def kill_flow(self, f):
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f.kill()
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self.delete_flow(f)
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def revert(self, f):
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f.revert()
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def replay(self, f, masterq):
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"""
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Returns None if successful, or error message if not.
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"""
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#begin nocover
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if f.intercepting:
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return "Can't replay while intercepting..."
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if f.request:
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f.backup()
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f.request.set_replay()
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if f.request.content:
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f.request.headers["content-length"] = [str(len(f.request.content))]
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f.response = None
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f.error = None
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rt = ReplayThread(f, masterq)
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rt.start()
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#end nocover
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class FlowMaster(controller.Master):
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def __init__(self, server, state):
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controller.Master.__init__(self, server)
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self.state = state
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def handle_clientconnect(self, r):
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self.state.clientconnect(r)
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r.ack()
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def handle_clientdisconnect(self, r):
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self.state.clientdisconnect(r)
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r.ack()
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def handle_error(self, r):
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f = self.state.add_error(r)
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r.ack()
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return f
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def handle_request(self, r):
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return self.state.add_request(r)
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def handle_response(self, r):
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f = self.state.add_response(r)
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if not f:
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r.ack()
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return f
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class FlowWriter:
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def __init__(self, fo):
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self.fo = fo
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self.ns = netstring.FileEncoder(fo)
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def add(self, flow):
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d = flow.get_state()
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s = json.dumps(d)
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self.ns.write(s)
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class FlowReader:
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def __init__(self, fo):
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self.fo = fo
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self.ns = netstring.decode_file(fo)
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def stream(self):
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"""
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Yields Flow objects from the dump.
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"""
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for i in self.ns:
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data = json.loads(i)
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yield Flow.from_state(data)
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