byt3bl33d3r/MITMf

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core/ferretng/DnsCache.py

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# Copyright (c) 2014-2016 Moxie Marlinspike, Marcello Salvati
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
#

class DnsCache:    

    '''
    The DnsCache maintains a cache of DNS lookups, mirroring the browser experience.
    '''

    _instance          = None

    def __init__(self):
        self.customAddress = None
        self.cache = {}

    @staticmethod
    def getInstance():
        if DnsCache._instance == None:
            DnsCache._instance = DnsCache()

        return DnsCache._instance

    def cacheResolution(self, host, address):
        self.cache[host] = address

    def getCachedAddress(self, host):
        if host in self.cache:
            return self.cache[host]

        return None