from __future__ import absolute_import import os import traceback import threading import shlex import sys class ScriptError(Exception): pass class ScriptContext: def __init__(self, master): self._master = master def log(self, message, level="info"): """ Logs an event. By default, only events with level "error" get displayed. This can be controlled with the "-v" switch. How log messages are handled depends on the front-end. mitmdump will print them to stdout, mitmproxy sends output to the eventlog for display ("e" keyboard shortcut). """ self._master.add_event(message, level) def kill_flow(self, f): """ Kills a flow immediately. No further data will be sent to the client or the server. """ f.kill(self._master) def duplicate_flow(self, f): """ Returns a duplicate of the specified flow. The flow is also injected into the current state, and is ready for editing, replay, etc. """ self._master.pause_scripts = True f = self._master.duplicate_flow(f) self._master.pause_scripts = False return f def replay_request(self, f): """ Replay the request on the current flow. The response will be added to the flow object. """ return self._master.replay_request(f, block=True, run_scripthooks=False) @property def app_registry(self): return self._master.apps class Script: """ Script object representing an inline script. """ def __init__(self, command, master): self.args = self.parse_command(command) self.ctx = ScriptContext(master) self.ns = None self.load() @classmethod def parse_command(cls, command): if not command or not command.strip(): raise ScriptError("Empty script command.") if os.name == "nt": # Windows: escape all backslashes in the path. backslashes = shlex.split(command, posix=False)[0].count("\\") command = command.replace("\\", "\\\\", backslashes) args = shlex.split(command) args[0] = os.path.expanduser(args[0]) if not os.path.exists(args[0]): raise ScriptError( ("Script file not found: %s.\r\n" "If your script path contains spaces, " "make sure to wrap it in additional quotes, e.g. -s \"'./foo bar/baz.py' --args\".") % args[0]) elif not os.path.isfile(args[0]): raise ScriptError("Not a file: %s" % args[0]) return args def load(self): """ Loads an inline script. Returns: The return value of self.run("start", ...) Raises: ScriptError on failure """ if self.ns is not None: self.unload() ns = {} script_dir = os.path.dirname(os.path.abspath(self.args[0])) sys.path.append(script_dir) try: execfile(self.args[0], ns, ns) except Exception as e: # Python 3: use exception chaining, https://www.python.org/dev/peps/pep-3134/ raise ScriptError(traceback.format_exc(e)) sys.path.pop() self.ns = ns return self.run("start", self.args) def unload(self): ret = self.run("done") self.ns = None return ret def run(self, name, *args, **kwargs): """ Runs an inline script hook. Returns: The return value of the method. None, if the script does not provide the method. Raises: ScriptError if there was an exception. """ f = self.ns.get(name) if f: try: return f(self.ctx, *args, **kwargs) except Exception as e: raise ScriptError(traceback.format_exc(e)) else: return None class ReplyProxy(object): def __init__(self, original_reply, script_thread): self.original_reply = original_reply self.script_thread = script_thread self._ignore_call = True self.lock = threading.Lock() def __call__(self, *args, **kwargs): with self.lock: if self._ignore_call: self.script_thread.start() self._ignore_call = False return self.original_reply(*args, **kwargs) def __getattr__(self, k): return getattr(self.original_reply, k) def _handle_concurrent_reply(fn, o, *args, **kwargs): # Make first call to o.reply a no op and start the script thread. # We must not start the script thread before, as this may lead to a nasty race condition # where the script thread replies a different response before the normal reply, which then gets swallowed. def run(): fn(*args, **kwargs) # If the script did not call .reply(), we have to do it now. reply_proxy() script_thread = ScriptThread(target=run) reply_proxy = ReplyProxy(o.reply, script_thread) o.reply = reply_proxy class ScriptThread(threading.Thread): name = "ScriptThread" def concurrent(fn): if fn.func_name in ( "request", "response", "error", "clientconnect", "serverconnect", "clientdisconnect", "next_layer"): def _concurrent(ctx, obj): _handle_concurrent_reply(fn, obj, ctx, obj) return _concurrent raise NotImplementedError( "Concurrent decorator not supported for '%s' method." % fn.func_name)