mirror of
https://github.com/sqlmapproject/sqlmap.git
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455 lines
14 KiB
Python
455 lines
14 KiB
Python
#!/usr/bin/env python
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#
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# Copyright 2002-2003 Michael D. Stenner
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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"""An HTTP handler for urllib2 that supports HTTP 1.1 and keepalive.
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>>> import urllib2
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>>> from keepalive import HTTPHandler
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>>> keepalive_handler = HTTPHandler()
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>>> opener = urllib2.build_opener(keepalive_handler)
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>>> urllib2.install_opener(opener)
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>>>
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>>> fo = urllib2.urlopen('http://www.python.org')
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To remove the handler, simply re-run build_opener with no arguments, and
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install that opener.
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You can explicitly close connections by using the close_connection()
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method of the returned file-like object (described below) or you can
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use the handler methods:
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close_connection(host)
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close_all()
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open_connections()
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>>> keepalive_handler.close_all()
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EXTRA ATTRIBUTES AND METHODS
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Upon a status of 200, the object returned has a few additional
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attributes and methods, which should not be used if you want to
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remain consistent with the normal urllib2-returned objects:
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close_connection() - close the connection to the host
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readlines() - you know, readlines()
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status - the return status (ie 404)
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reason - english translation of status (ie 'File not found')
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If you want the best of both worlds, use this inside an
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AttributeError-catching try:
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>>> try: status = fo.status
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>>> except AttributeError: status = None
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Unfortunately, these are ONLY there if status == 200, so it's not
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easy to distinguish between non-200 responses. The reason is that
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urllib2 tries to do clever things with error codes 301, 302, 401,
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and 407, and it wraps the object upon return.
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You can optionally set the module-level global HANDLE_ERRORS to 0,
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in which case the handler will always return the object directly.
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If you like the fancy handling of errors, don't do this. If you
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prefer to see your error codes, then do.
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"""
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from httplib import _CS_REQ_STARTED, _CS_REQ_SENT, _CS_IDLE, CannotSendHeader
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import threading
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import urllib2
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import httplib
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import socket
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VERSION = (0, 1)
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#STRING_VERSION = '.'.join(map(str, VERSION))
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DEBUG = 0
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HANDLE_ERRORS = 1
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class HTTPHandler(urllib2.HTTPHandler):
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def __init__(self):
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self._connections = {}
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def close_connection(self, host):
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"""close connection to <host>
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host is the host:port spec, as in 'www.cnn.com:8080' as passed in.
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no error occurs if there is no connection to that host."""
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self._remove_connection(host, close=1)
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def open_connections(self):
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"""return a list of connected hosts"""
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retVal = []
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currentThread = threading.currentThread()
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for thread, host in self._connections.keys():
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if thread == currentThread:
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retVal.append(host)
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return retVal
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def close_all(self):
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"""close all open connections"""
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for _, conn in self._connections.items():
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conn.close()
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self._connections = {}
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def _remove_connection(self, host, close=0):
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key = self._get_connection_key(host)
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if self._connections.has_key(key):
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if close: self._connections[key].close()
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del self._connections[key]
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def _get_connection_key(self, host):
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return (threading.currentThread(), host)
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def _start_connection(self, h, req):
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h.clearheaders()
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try:
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if req.has_data():
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data = req.get_data()
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h.putrequest('POST', req.get_selector())
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if not req.headers.has_key('Content-type'):
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h.putheader('Content-type', 'application/x-www-form-urlencoded')
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if not req.headers.has_key('Content-length'):
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h.putheader('Content-length', '%d' % len(data))
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else:
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h.putrequest('GET', req.get_selector())
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for args in self.parent.addheaders:
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h.putheader(*args)
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for k, v in req.headers.items():
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h.putheader(k, v)
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h.endheaders()
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if req.has_data():
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h.send(data)
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except socket.error, err:
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h.close()
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raise urllib2.URLError(err)
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def do_open(self, http_class, req):
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h = None
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host = req.get_host()
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if not host:
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raise urllib2.URLError('no host given')
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try:
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need_new_connection = 1
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key = self._get_connection_key(host)
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h = self._connections.get(key)
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if not h is None:
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try:
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self._start_connection(h, req)
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except socket.error, e:
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r = None
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else:
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try: r = h.getresponse()
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except httplib.ResponseNotReady, e: r = None
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if r is None or r.version == 9:
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# httplib falls back to assuming HTTP 0.9 if it gets a
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# bad header back. This is most likely to happen if
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# the socket has been closed by the server since we
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# last used the connection.
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if DEBUG: print "failed to re-use connection to %s" % host
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h.close()
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else:
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if DEBUG: print "re-using connection to %s" % host
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need_new_connection = 0
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if need_new_connection:
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if DEBUG: print "creating new connection to %s" % host
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h = http_class(host)
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self._connections[key] = h
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self._start_connection(h, req)
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r = h.getresponse()
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except socket.error, err:
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if h: h.close()
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raise urllib2.URLError(err)
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# if not a persistent connection, don't try to reuse it
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if r.will_close: self._remove_connection(host)
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if DEBUG:
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print "STATUS: %s, %s" % (r.status, r.reason)
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r._handler = self
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r._host = host
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r._url = req.get_full_url()
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#if r.status == 200 or not HANDLE_ERRORS:
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#return r
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if r.status == 200 or not HANDLE_ERRORS:
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# [speedplane] Must return an adinfourl object
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resp = urllib2.addinfourl(r, r.msg, req.get_full_url())
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resp.code = r.status
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resp.msg = r.reason
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return resp;
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else:
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return self.parent.error('http', req, r, r.status, r.reason, r.msg)
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def http_open(self, req):
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return self.do_open(HTTPConnection, req)
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class HTTPResponse(httplib.HTTPResponse):
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# we need to subclass HTTPResponse in order to
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# 1) add readline() and readlines() methods
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# 2) add close_connection() methods
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# 3) add info() and geturl() methods
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# in order to add readline(), read must be modified to deal with a
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# buffer. example: readline must read a buffer and then spit back
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# one line at a time. The only real alternative is to read one
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# BYTE at a time (ick). Once something has been read, it can't be
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# put back (ok, maybe it can, but that's even uglier than this),
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# so if you THEN do a normal read, you must first take stuff from
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# the buffer.
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# the read method wraps the original to accomodate buffering,
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# although read() never adds to the buffer.
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# Both readline and readlines have been stolen with almost no
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# modification from socket.py
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def __init__(self, sock, debuglevel=0, strict=0, method=None):
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if method: # the httplib in python 2.3 uses the method arg
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httplib.HTTPResponse.__init__(self, sock, debuglevel, method)
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else: # 2.2 doesn't
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httplib.HTTPResponse.__init__(self, sock, debuglevel)
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self.fileno = sock.fileno
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self._rbuf = ''
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self._rbufsize = 8096
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self._handler = None # inserted by the handler later
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self._host = None # (same)
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self._url = None # (same)
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_raw_read = httplib.HTTPResponse.read
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def close_connection(self):
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self.close()
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self._handler._remove_connection(self._host, close=1)
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def info(self):
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return self.msg
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def geturl(self):
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return self._url
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def read(self, amt=None):
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# the _rbuf test is only in this first if for speed. It's not
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# logically necessary
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if self._rbuf and not amt is None:
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L = len(self._rbuf)
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if amt > L:
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amt -= L
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else:
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s = self._rbuf[:amt]
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self._rbuf = self._rbuf[amt:]
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return s
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s = self._rbuf + self._raw_read(amt)
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self._rbuf = ''
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return s
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def readline(self, limit=-1):
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data = ""
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i = self._rbuf.find('\n')
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while i < 0 and not (0 < limit <= len(self._rbuf)):
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new = self._raw_read(self._rbufsize)
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if not new: break
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i = new.find('\n')
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if i >= 0: i = i + len(self._rbuf)
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self._rbuf = self._rbuf + new
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if i < 0: i = len(self._rbuf)
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else: i = i+1
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if 0 <= limit < len(self._rbuf): i = limit
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data, self._rbuf = self._rbuf[:i], self._rbuf[i:]
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return data
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def readlines(self, sizehint = 0):
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total = 0
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list = []
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while 1:
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line = self.readline()
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if not line: break
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list.append(line)
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total += len(line)
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if sizehint and total >= sizehint:
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break
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return list
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class HTTPConnection(httplib.HTTPConnection):
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# use the modified response class
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response_class = HTTPResponse
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_headers = {}
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def clearheaders(self):
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self._headers.clear()
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def putheader(self, header, value):
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"""Send a request header line to the server.
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For example: h.putheader('Accept', 'text/html')
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"""
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if self.__state != _CS_REQ_STARTED:
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raise CannotSendHeader()
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self._headers[header] = value
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def endheaders(self):
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"""Indicate that the last header line has been sent to the server."""
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if self.__state == _CS_REQ_STARTED:
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self.__state = _CS_REQ_SENT
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else:
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raise CannotSendHeader()
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for header in ['Host', 'Accept-Encoding']:
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if header in self._headers:
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str = '%s: %s' % (header, self._headers[header])
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self._output(str)
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del self._headers[header]
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for header, value in self._headers.items():
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str = '%s: %s' % (header, value)
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self._output(str)
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self._send_output()
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#########################################################################
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##### TEST FUNCTIONS
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#########################################################################
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def error_handler(url):
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global HANDLE_ERRORS
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orig = HANDLE_ERRORS
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keepalive_handler = HTTPHandler()
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opener = urllib2.build_opener(keepalive_handler)
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urllib2.install_opener(opener)
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pos = {0: 'off', 1: 'on'}
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for i in (0, 1):
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print " fancy error handling %s (HANDLE_ERRORS = %i)" % (pos[i], i)
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HANDLE_ERRORS = i
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try:
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fo = urllib2.urlopen(url)
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foo = fo.read()
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fo.close()
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try: status, reason = fo.status, fo.reason
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except AttributeError: status, reason = None, None
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except IOError, e:
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print " EXCEPTION: %s" % e
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raise
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else:
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print " status = %s, reason = %s" % (status, reason)
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HANDLE_ERRORS = orig
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hosts = keepalive_handler.open_connections()
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print "open connections:", ' '.join(hosts)
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keepalive_handler.close_all()
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def continuity(url):
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import md5
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format = '%25s: %s'
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# first fetch the file with the normal http handler
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opener = urllib2.build_opener()
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urllib2.install_opener(opener)
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fo = urllib2.urlopen(url)
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foo = fo.read()
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fo.close()
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m = md5.new(foo)
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print format % ('normal urllib', m.hexdigest())
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# now install the keepalive handler and try again
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opener = urllib2.build_opener(HTTPHandler())
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urllib2.install_opener(opener)
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fo = urllib2.urlopen(url)
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foo = fo.read()
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fo.close()
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m = md5.new(foo)
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print format % ('keepalive read', m.hexdigest())
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fo = urllib2.urlopen(url)
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foo = ''
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while 1:
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f = fo.readline()
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if f: foo = foo + f
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else: break
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fo.close()
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m = md5.new(foo)
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print format % ('keepalive readline', m.hexdigest())
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def comp(N, url):
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print ' making %i connections to:\n %s' % (N, url)
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sys.stdout.write(' first using the normal urllib handlers')
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# first use normal opener
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opener = urllib2.build_opener()
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urllib2.install_opener(opener)
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t1 = fetch(N, url)
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print ' TIME: %.3f s' % t1
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sys.stdout.write(' now using the keepalive handler ')
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# now install the keepalive handler and try again
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opener = urllib2.build_opener(HTTPHandler())
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urllib2.install_opener(opener)
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t2 = fetch(N, url)
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print ' TIME: %.3f s' % t2
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print ' improvement factor: %.2f' % (t1/t2, )
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def fetch(N, url, delay=0):
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lens = []
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starttime = time.time()
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for i in range(N):
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if delay and i > 0: time.sleep(delay)
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fo = urllib2.urlopen(url)
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foo = fo.read()
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fo.close()
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lens.append(len(foo))
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diff = time.time() - starttime
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j = 0
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for i in lens[1:]:
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j = j + 1
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if not i == lens[0]:
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print "WARNING: inconsistent length on read %i: %i" % (j, i)
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return diff
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def test(url, N=10):
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print "checking error hander (do this on a non-200)"
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try: error_handler(url)
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except IOError, e:
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print "exiting - exception will prevent further tests"
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sys.exit()
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print
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print "performing continuity test (making sure stuff isn't corrupted)"
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continuity(url)
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print
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print "performing speed comparison"
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comp(N, url)
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if __name__ == '__main__':
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import time
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import sys
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try:
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N = int(sys.argv[1])
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url = sys.argv[2]
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except:
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print "%s <integer> <url>" % sys.argv[0]
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else:
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test(url, N)
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