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/usr/lib/python2.7/dist-packages/volatility/plugins/mac/dead_sockets.py is in volatility 2.6-1.

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# Volatility
# Copyright (C) 2007-2013 Volatility Foundation
#
# This file is part of Volatility.
#
# Volatility 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 2 of the License, or
# (at your option) any later version.
#
# Volatility 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 Volatility.  If not, see <http://www.gnu.org/licenses/>.
#

"""
@author:       Andrew Case
@license:      GNU General Public License 2.0
@contact:      atcuno@gmail.com
@organization: 
"""

import volatility.obj as obj
import volatility.plugins.mac.common as common
import volatility.plugins.mac.list_zones as list_zones
import volatility.plugins.mac.netstat as netstat

class mac_dead_sockets(netstat.mac_netstat):
    """ Prints terminated/de-allocated network sockets """

    def calculate(self):
        common.set_plugin_members(self)
    
        zones = list_zones.mac_list_zones(self._config).calculate()

        for zone in zones:
            name = str(zone.zone_name.dereference())
            if name == "socket":
                sockets = zone.get_free_elements("socket")        
                for socket in sockets:
                    yield socket

    def render_text(self, outfd, data):
        self.table_header(outfd, [("Proto", "6"),
                                  ("Local IP", "20"),
                                  ("Local Port", "6"),
                                  ("Remote IP", "20"),
                                  ("Remote Port", "6"),
                                  ("State", "10")])
        
        for socket in data:
            family = socket.family

            if family == 1:
                upcb = socket.so_pcb.dereference_as("unpcb")
                path = upcb.unp_addr.sun_path
                outfd.write("UNIX {0}\n".format(path))
            elif family in [2, 30]:
                proto = socket.protocol
                state = socket.state
                
                ret =  socket.get_connection_info()
               
                if ret:
                    (lip, lport, rip, rport) = ret
                else:
                    (lip, lport, rip, rport) = ("", "", "", "")

                self.table_row(outfd, proto, lip, lport, rip, rport, state)