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POTwisted Web Proxy
 

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    <p>I have been running this code (from: <a href="http://blog.somethingaboutcode.com/?p=155" rel="nofollow noreferrer">http://blog.somethingaboutcode.com/?p=155</a> ):</p> <pre><code>from twisted.internet import reactor from twisted.web import http from twisted.web.proxy import Proxy, ProxyRequest, ProxyClientFactory, ProxyClient from ImageFile import Parser from StringIO import StringIO class InterceptingProxyClient(ProxyClient): def __init__(self, *args, **kwargs): ProxyClient.__init__(self, *args, **kwargs) self.image_parser = None def handleHeader(self, key, value): if key == "Content-Type" and value in ["image/jpeg", "image/gif", "image/png"]: self.image_parser = Parser() if key == "Content-Length" and self.image_parser: pass else: ProxyClient.handleHeader(self, key, value) def handleEndHeaders(self): if self.image_parser: pass #Need to calculate and send Content-Length first else: ProxyClient.handleEndHeaders(self) def handleResponsePart(self, buffer): print buffer if self.image_parser: self.image_parser.feed(buffer) else: ProxyClient.handleResponsePart(self, buffer) def handleResponseEnd(self): if self.image_parser: image = self.image_parser.close() try: format = image.format image = image.rotate(180) s = StringIO() image.save(s, format) buffer = s.getvalue() except: buffer = "" ProxyClient.handleHeader(self, "Content-Length", len(buffer)) ProxyClient.handleEndHeaders(self) ProxyClient.handleResponsePart(self, buffer) ProxyClient.handleResponseEnd(self) class InterceptingProxyClientFactory(ProxyClientFactory): protocol = InterceptingProxyClient class InterceptingProxyRequest(ProxyRequest): protocols = {'http': InterceptingProxyClientFactory} ports = {"http" : 80} class InterceptingProxy(Proxy): requestFactory = InterceptingProxyRequest factory = http.HTTPFactory() factory.protocol = InterceptingProxy reactor.listenTCP(8000, factory) reactor.run() </code></pre> <p>Whenever I get this and go to 127.0.0.1:8000 I get this:</p> <pre><code>Traceback (most recent call last): File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\log.py", line 84, in callWithLogger return callWithContext({"system": lp}, func, *args, **kw) File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\log.py", line 69, in callWithContext return context.call({ILogContext: newCtx}, func, *args, **kw) File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\context.p y", line 59, in callWithContext return self.currentContext().callWithContext(ctx, func, *args, **kw) File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\python\context.p y", line 37, in callWithContext return func(*args,**kw) --- &lt;exception caught here&gt; --- File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\selectr eactor.py", line 146, in _doReadOrWrite why = getattr(selectable, method)() File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\internet\tcp.py" , line 460, in doRead return self.protocol.dataReceived(data) File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\protocols\basic. py", line 251, in dataReceived why = self.lineReceived(line) File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\web\http.py", li ne 1573, in lineReceived self.allContentReceived() File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\web\http.py", li ne 1641, in allContentReceived req.requestReceived(command, path, version) File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\web\http.py", li ne 807, in requestReceived self.process() File "C:\Program Files\Python 2.6.2\lib\site-packages\twisted\web\proxy.py", l ine 147, in process port = self.ports[protocol] exceptions.KeyError: '' </code></pre> <p>Whenever I setup firefox or chrome or opera to use the proxy on localhost:8000 there are no connections made to the proxy (and I can no longer connect to any page, though that is probably because it isn't connection to the proxy).</p> <hr> <p>Ok it still fails and with logging I get this output when I set firefox to use the proxy at localhost:8000 and don't visit the proxy directly from the web browser (such as by typing localhost:8000 in firefox's address bar)</p> <pre><code>2010-08-04 12:31:18-0400 [-] Log opened. 2010-08-04 12:31:29-0400 [-] twisted.web.http.HTTPFactory starting on 8000 2010-08-04 12:31:29-0400 [-] Starting factory &lt;twisted.web.http.HTTPFactory inst ance at 0x010B3EE0&gt; 2010-08-04 12:33:55-0400 [-] Received SIGINT, shutting down. 2010-08-04 12:33:55-0400 [twisted.web.http.HTTPFactory] (Port 8000 Closed) 2010-08-04 12:33:55-0400 [twisted.web.http.HTTPFactory] Stopping factory &lt;twiste d.web.http.HTTPFactory instance at 0x010B3EE0&gt; 2010-08-04 12:33:55-0400 [-] Main loop terminated. </code></pre> <p>However when I do visit the proxy directly I get the key error.</p> <p>Also for sniffing I can't; Wireshark doesn't seem to sniff the localhost traffic and if I use fiddler 2 it sets itself as the proxy (and so I am no longer using my proxy server) and then works (because it uses fiddler 2's proxy).</p>
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