# Volatility
# Copyright (C) 2008-2013 Volatility Foundation
# Copyright (c) 2008 Brendan Dolan-Gavitt <bdolangavitt@wesleyan.edu>
#
# 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/>.
#

"""
This module implements the fast connection scanning

@author:       AAron Walters and Brendan Dolan-Gavitt
@license:      GNU General Public License 2.0
@contact:      awalters@4tphi.net,bdolangavitt@wesleyan.edu
@organization: Volatility Foundation
"""

#pylint: disable-msg=C0111

import volatility.poolscan as poolscan
import volatility.plugins.common as common
from volatility.renderers import TreeGrid
from volatility.renderers.basic import Address

class PoolScanConn(poolscan.PoolScanner):
    """Pool scanner for tcp connections"""

    def __init__(self, address_space):
        poolscan.PoolScanner.__init__(self, address_space)

        self.struct_name = "_TCPT_OBJECT"
        self.pooltag = "TCPT"

        self.checks = [ ('CheckPoolSize', dict(condition = lambda x: x >= 0x198)),
                   ('CheckPoolType', dict(non_paged = True, free = True)),
                   ('CheckPoolIndex', dict(value = lambda x : x < 5)),
                   ]

class ConnScan(common.AbstractScanCommand):
    """Pool scanner for tcp connections"""

    scanners = [PoolScanConn]

    meta_info = dict(
        author = 'Brendan Dolan-Gavitt',
        copyright = 'Copyright (c) 2007,2008 Brendan Dolan-Gavitt',
        contact = 'bdolangavitt@wesleyan.edu',
        license = 'GNU General Public License 2.0',
        url = 'http://moyix.blogspot.com/',
        os = 'WIN_32_XP_SP2',
        version = '1.0',
        )

    @staticmethod
    def is_valid_profile(profile):
        return (profile.metadata.get('os', 'unknown') == 'windows' and
                profile.metadata.get('major', 0) == 5)

    def render_text(self, outfd, data):
        self.table_header(outfd,
                          [(self.offset_column(), "[addrpad]"),
                           ("Local Address", "25"),
                           ("Remote Address", "25"),
                           ("Pid", "")
                           ])

        for tcp_obj in data:
            local = "{0}:{1}".format(tcp_obj.LocalIpAddress, tcp_obj.LocalPort)
            remote = "{0}:{1}".format(tcp_obj.RemoteIpAddress, tcp_obj.RemotePort)
            self.table_row(outfd,
                            tcp_obj.obj_offset,
                            local, remote,
                            tcp_obj.Pid)

    def unified_output(self, data):
        return TreeGrid([("Offset(P)", Address),
                       ("LocalAddress", str),
                       ("RemoteAddress", str),
                       ("PID", int)],
                        self.generator(data))

    def generator(self, data):
        for conn in data:
            local = "{0}:{1}".format(conn.LocalIpAddress, conn.LocalPort)
            remote = "{0}:{1}".format(conn.RemoteIpAddress, conn.RemotePort)
            yield (0, [Address(conn.obj_offset), str(local), str(remote), int(conn.Pid)])