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curl/tests/python_dependencies/impacket/nmb.py

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from __future__ import print_function
from __future__ import absolute_import
# Copyright (c) 2003-2016 CORE Security Technologies
#
# This software is provided under under a slightly modified version
# of the Apache Software License. See the accompanying LICENSE file
# for more information.
#
# -*- mode: python; tab-width: 4 -*-
#
# Copyright (C) 2001 Michael Teo <michaelteo@bigfoot.com>
# nmb.py - NetBIOS library
#
# This software is provided 'as-is', without any express or implied warranty.
# In no event will the author be held liable for any damages arising from the
# use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
#
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
#
# 3. This notice cannot be removed or altered from any source distribution.
#
# Altered source done by Alberto Solino (@agsolino)
import socket
import string
import re
import select
import errno
from random import randint
from struct import pack, unpack
import time
from .structure import Structure
CVS_REVISION = '$Revision: 526 $'
# Taken from socket module reference
INADDR_ANY = '0.0.0.0'
BROADCAST_ADDR = '<broadcast>'
# Default port for NetBIOS name service
NETBIOS_NS_PORT = 137
# Default port for NetBIOS session service
NETBIOS_SESSION_PORT = 139
# Default port for SMB session service
SMB_SESSION_PORT = 445
# Owner Node Type Constants
NODE_B = 0x0000
NODE_P = 0x2000
NODE_M = 0x4000
NODE_RESERVED = 0x6000
NODE_GROUP = 0x8000
NODE_UNIQUE = 0x0
# Name Type Constants
TYPE_UNKNOWN = 0x01
TYPE_WORKSTATION = 0x00
TYPE_CLIENT = 0x03
TYPE_SERVER = 0x20
TYPE_DOMAIN_MASTER = 0x1B
TYPE_DOMAIN_CONTROLLER = 0x1C
TYPE_MASTER_BROWSER = 0x1D
TYPE_BROWSER = 0x1E
TYPE_NETDDE = 0x1F
TYPE_STATUS = 0x21
# Opcodes values
OPCODE_QUERY = 0
OPCODE_REGISTRATION = 0x5
OPCODE_RELEASE = 0x6
OPCODE_WACK = 0x7
OPCODE_REFRESH = 0x8
OPCODE_REQUEST = 0
OPCODE_RESPONSE = 0x10
# NM_FLAGS
NM_FLAGS_BROADCAST = 0x1
NM_FLAGS_UNICAST = 0
NM_FLAGS_RA = 0x8
NM_FLAGS_RD = 0x10
NM_FLAGS_TC = 0x20
NM_FLAGS_AA = 0x40
# QUESTION_TYPE
QUESTION_TYPE_NB = 0x20 # NetBIOS general Name Service Resource Record
QUESTION_TYPE_NBSTAT = 0x21 # NetBIOS NODE STATUS Resource Record
# QUESTION_CLASS
QUESTION_CLASS_IN = 0x1 # Internet class
# RR_TYPE Resource Record Type code
RR_TYPE_A = 0x1 # IP address Resource Record
RR_TYPE_NS = 0x2 # Name Server Resource Record
RR_TYPE_NULL = 0xA # NULL Resource Record
RR_TYPE_NB = 0x20 # NetBIOS general Name Service Resource Record
RR_TYPE_NBSTAT = 0x21 # NetBIOS NODE STATUS Resource Record
# Resource Record Class
RR_CLASS_IN = 1 # Internet class
# RCODE values
RCODE_FMT_ERR = 0x1 # Format Error. Request was invalidly formatted.
RCODE_SRV_ERR = 0x2 # Server failure. Problem with NBNS, cannot process name.
RCODE_IMP_ERR = 0x4 # Unsupported request error. Allowable only for challenging NBNS when gets an Update type
# registration request.
RCODE_RFS_ERR = 0x5 # Refused error. For policy reasons server will not register this name from this host.
RCODE_ACT_ERR = 0x6 # Active error. Name is owned by another node.
RCODE_CFT_ERR = 0x7 # Name in conflict error. A UNIQUE name is owned by more than one node.
# NAME_FLAGS
NAME_FLAGS_PRM = 0x0200 # Permanent Name Flag. If one (1) then entry is for the permanent node name. Flag is zero
# (0) for all other names.
NAME_FLAGS_ACT = 0x0400 # Active Name Flag. All entries have this flag set to one (1).
NAME_FLAG_CNF = 0x0800 # Conflict Flag. If one (1) then name on this node is in conflict.
NAME_FLAG_DRG = 0x1000 # Deregister Flag. If one (1) then this name is in the process of being deleted.
NAME_TYPES = { TYPE_UNKNOWN: 'Unknown', TYPE_WORKSTATION: 'Workstation', TYPE_CLIENT: 'Client',
TYPE_SERVER: 'Server', TYPE_MASTER_BROWSER: 'Master Browser', TYPE_BROWSER: 'Browser Server',
TYPE_DOMAIN_MASTER: 'Domain Master' , TYPE_NETDDE: 'NetDDE Server'}
# NetBIOS Session Types
NETBIOS_SESSION_MESSAGE = 0x0
NETBIOS_SESSION_REQUEST = 0x81
NETBIOS_SESSION_POSITIVE_RESPONSE = 0x82
NETBIOS_SESSION_NEGATIVE_RESPONSE = 0x83
NETBIOS_SESSION_RETARGET_RESPONSE = 0x84
NETBIOS_SESSION_KEEP_ALIVE = 0x85
def strerror(errclass, errcode):
if errclass == ERRCLASS_OS:
return 'OS Error', str(errcode)
elif errclass == ERRCLASS_QUERY:
return 'Query Error', QUERY_ERRORS.get(errcode, 'Unknown error')
elif errclass == ERRCLASS_SESSION:
return 'Session Error', SESSION_ERRORS.get(errcode, 'Unknown error')
else:
return 'Unknown Error Class', 'Unknown Error'
class NetBIOSError(Exception): pass
class NetBIOSTimeout(Exception):
def __init__(self, message = 'The NETBIOS connection with the remote host timed out.'):
Exception.__init__(self, message)
class NBResourceRecord:
def __init__(self, data = 0):
self._data = data
try:
if self._data:
self.rr_name = (re.split('\x00',data))[0]
offset = len(self.rr_name)+1
self.rr_type = unpack('>H', self._data[offset:offset+2])[0]
self.rr_class = unpack('>H', self._data[offset+2: offset+4])[0]
self.ttl = unpack('>L',self._data[offset+4:offset+8])[0]
self.rdlength = unpack('>H', self._data[offset+8:offset+10])[0]
self.rdata = self._data[offset+10:offset+10+self.rdlength]
offset = self.rdlength - 2
self.unit_id = data[offset:offset+6]
else:
self.rr_name = ''
self.rr_type = 0
self.rr_class = 0
self.ttl = 0
self.rdlength = 0
self.rdata = ''
self.unit_id = ''
except Exception:
raise NetBIOSError( 'Wrong packet format ' )
def set_rr_name(self, name):
self.rr_name = name
def set_rr_type(self, name):
self.rr_type = name
def set_rr_class(self,cl):
self.rr_class = cl
def set_ttl(self,ttl):
self.ttl = ttl
def set_rdata(self,rdata):
self.rdata = rdata
self.rdlength = len(rdata)
def get_unit_id(self):
return self.unit_id
def get_rr_name(self):
return self.rr_name
def get_rr_class(self):
return self.rr_class
def get_ttl(self):
return self.ttl
def get_rdlength(self):
return self.rdlength
def get_rdata(self):
return self.rdata
def rawData(self):
return self.rr_name + pack('!HHLH',self.rr_type, self.rr_class, self.ttl, self.rdlength) + self.rdata
class NBNodeStatusResponse(NBResourceRecord):
def __init__(self, data = 0):
NBResourceRecord.__init__(self,data)
self.num_names = 0
self.node_names = [ ]
self.statstics = ''
self.mac = '00-00-00-00-00-00'
try:
if data:
self._data = self.get_rdata()
self.num_names = unpack('>B',self._data[:1])[0]
offset = 1
for i in range(0, self.num_names):
name = self._data[offset:offset + 15]
type,flags = unpack('>BH', self._data[offset + 15: offset + 18])
offset += 18
self.node_names.append(NBNodeEntry(name, type ,flags))
self.set_mac_in_hexa(self.get_unit_id())
except Exception:
raise NetBIOSError( 'Wrong packet format ' )
def set_mac_in_hexa(self, data):
data_aux = ''
for d in data:
if data_aux == '':
data_aux = '%02x' % ord(d)
else:
data_aux += '-%02x' % ord(d)
self.mac = string.upper(data_aux)
def get_num_names(self):
return self.num_names
def get_mac(self):
return self.mac
def set_num_names(self, num):
self.num_names = num
def get_node_names(self):
return self.node_names
def add_node_name(self,node_names):
self.node_names.append(node_names)
self.num_names += 1
def rawData(self):
res = pack('!B', self.num_names )
for i in range(0, self.num_names):
res += self.node_names[i].rawData()
class NBPositiveNameQueryResponse(NBResourceRecord):
def __init__(self, data = 0):
NBResourceRecord.__init__(self, data)
self.addr_entries = [ ]
if data:
self._data = self.get_rdata()
_qn_length, qn_name, qn_scope = decode_name(data)
self._netbios_name = string.rstrip(qn_name[:-1]) + qn_scope
self._name_type = ord(qn_name[-1])
self._nb_flags = unpack('!H', self._data[:2])
offset = 2
while offset<len(self._data):
self.addr_entries.append('%d.%d.%d.%d' % unpack('4B', (self._data[offset:offset+4])))
offset += 4
def get_netbios_name(self):
return self._netbios_name
def get_name_type(self):
return self._name_type
def get_addr_entries(self):
return self.addr_entries
class NetBIOSPacket:
""" This is a packet as defined in RFC 1002 """
def __init__(self, data = 0):
self.name_trn_id = 0x0 # Transaction ID for Name Service Transaction.
# Requestor places a unique value for each active
# transaction. Responder puts NAME_TRN_ID value
# from request packet in response packet.
self.opcode = 0 # Packet type code
self.nm_flags = 0 # Flags for operation
self.rcode = 0 # Result codes of request.
self.qdcount = 0 # Unsigned 16 bit integer specifying the number of entries in the question section of a Name
self.ancount = 0 # Unsigned 16 bit integer specifying the number of
# resource records in the answer section of a Name
# Service packet.
self.nscount = 0 # Unsigned 16 bit integer specifying the number of
# resource records in the authority section of a
# Name Service packet.
self.arcount = 0 # Unsigned 16 bit integer specifying the number of
# resource records in the additional records
# section of a Name Service packeT.
self.questions = ''
self.answers = ''
if data == 0:
self._data = ''
else:
try:
self._data = data
self.opcode = ord(data[2]) >> 3
self.nm_flags = ((ord(data[2]) & 0x3) << 4) | ((ord(data[3]) & 0xf0) >> 4)
self.name_trn_id = unpack('>H', self._data[:2])[0]
self.rcode = ord(data[3]) & 0x0f
self.qdcount = unpack('>H', self._data[4:6])[0]
self.ancount = unpack('>H', self._data[6:8])[0]
self.nscount = unpack('>H', self._data[8:10])[0]
self.arcount = unpack('>H', self._data[10:12])[0]
self.answers = self._data[12:]
except Exception:
raise NetBIOSError( 'Wrong packet format ' )
def set_opcode(self, opcode):
self.opcode = opcode
def set_trn_id(self, trn):
self.name_trn_id = trn
def set_nm_flags(self, nm_flags):
self.nm_flags = nm_flags
def set_rcode(self, rcode):
self.rcode = rcode
def addQuestion(self, question, qtype, qclass):
self.qdcount += 1
self.questions += question + pack('!HH',qtype,qclass)
def get_trn_id(self):
return self.name_trn_id
def get_rcode(self):
return self.rcode
def get_nm_flags(self):
return self.nm_flags
def get_opcode(self):
return self.opcode
def get_qdcount(self):
return self.qdcount
def get_ancount(self):
return self.ancount
def get_nscount(self):
return self.nscount
def get_arcount(self):
return self.arcount
def rawData(self):
secondWord = self.opcode << 11
secondWord |= self.nm_flags << 4
secondWord |= self.rcode
data = pack('!HHHHHH', self.name_trn_id, secondWord , self.qdcount, self.ancount, self.nscount, self.arcount) + self.questions + self.answers
return data
def get_answers(self):
return self.answers
class NBHostEntry:
def __init__(self, nbname, nametype, ip):
self.__nbname = nbname
self.__nametype = nametype
self.__ip = ip
def get_nbname(self):
return self.__nbname
def get_nametype(self):
return self.__nametype
def get_ip(self):
return self.__ip
def __repr__(self):
return '<NBHostEntry instance: NBname="' + self.__nbname + '", IP="' + self.__ip + '">'
class NBNodeEntry:
def __init__(self, nbname, nametype, flags):
self.__nbname = string.ljust(nbname,17)
self.__nametype = nametype
self.__flags = flags
self.__isgroup = flags & 0x8000
self.__nodetype = flags & 0x6000
self.__deleting = flags & 0x1000
self.__isconflict = flags & 0x0800
self.__isactive = flags & 0x0400
self.__ispermanent = flags & 0x0200
def get_nbname(self):
return self.__nbname
def get_nametype(self):
return self.__nametype
def is_group(self):
return self.__isgroup
def get_nodetype(self):
return self.__nodetype
def is_deleting(self):
return self.__deleting
def is_conflict(self):
return self.__isconflict
def is_active(self):
return self.__isactive
def is_permanent(self):
return self.__ispermanent
def set_nbname(self, name):
self.__nbname = string.ljust(name,17)
def set_nametype(self, type):
self.__nametype = type
def set_flags(self,flags):
self.__flags = flags
def __repr__(self):
s = '<NBNodeEntry instance: NBname="' + self.__nbname + '" NameType="' + NAME_TYPES[self.__nametype] + '"'
if self.__isactive:
s += ' ACTIVE'
if self.__isgroup:
s += ' GROUP'
if self.__isconflict:
s += ' CONFLICT'
if self.__deleting:
s += ' DELETING'
return s
def rawData(self):
return self.__nbname + pack('!BH',self.__nametype, self.__flags)
class NetBIOS:
# Creates a NetBIOS instance without specifying any default NetBIOS domain nameserver.
# All queries will be sent through the servport.
def __init__(self, servport = NETBIOS_NS_PORT):
self.__servport = NETBIOS_NS_PORT
self.__nameserver = None
self.__broadcastaddr = BROADCAST_ADDR
self.mac = '00-00-00-00-00-00'
def _setup_connection(self, dstaddr):
port = randint(10000, 60000)
af, socktype, proto, _canonname, _sa = socket.getaddrinfo(dstaddr, port, socket.AF_INET, socket.SOCK_DGRAM)[0]
s = socket.socket(af, socktype, proto)
has_bind = 1
for _i in range(0, 10):
# We try to bind to a port for 10 tries
try:
s.bind(( INADDR_ANY, randint(10000, 60000) ))
s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
has_bind = 1
except socket.error:
pass
if not has_bind:
raise NetBIOSError( 'Cannot bind to a good UDP port', ERRCLASS_OS, errno.EAGAIN)
self.__sock = s
# Set the default NetBIOS domain nameserver.
def set_nameserver(self, nameserver):
self.__nameserver = nameserver
# Return the default NetBIOS domain nameserver, or None if none is specified.
def get_nameserver(self):
return self.__nameserver
# Set the broadcast address to be used for query.
def set_broadcastaddr(self, broadcastaddr):
self.__broadcastaddr = broadcastaddr
# Return the broadcast address to be used, or BROADCAST_ADDR if default broadcast address is used.
def get_broadcastaddr(self):
return self.__broadcastaddr
# Returns a NBPositiveNameQueryResponse instance containing the host information for nbname.
# If a NetBIOS domain nameserver has been specified, it will be used for the query.
# Otherwise, the query is broadcasted on the broadcast address.
def gethostbyname(self, nbname, qtype = TYPE_WORKSTATION, scope = None, timeout = 1):
return self.__queryname(nbname, self.__nameserver, qtype, scope, timeout)
# Returns a list of NBNodeEntry instances containing node status information for nbname.
# If destaddr contains an IP address, then this will become an unicast query on the destaddr.
# Raises NetBIOSTimeout if timeout (in secs) is reached.
# Raises NetBIOSError for other errors
def getnodestatus(self, nbname, destaddr = None, type = TYPE_WORKSTATION, scope = None, timeout = 1):
if destaddr:
return self.__querynodestatus(nbname, destaddr, type, scope, timeout)
else:
return self.__querynodestatus(nbname, self.__nameserver, type, scope, timeout)
def getnetbiosname(self, ip):
entries = self.getnodestatus('*',ip)
entries = filter(lambda x:x.get_nametype() == TYPE_SERVER, entries)
return entries[0].get_nbname().strip()
def getmacaddress(self):
return self.mac
def __queryname(self, nbname, destaddr, qtype, scope, timeout, retries = 0):
self._setup_connection(destaddr)
trn_id = randint(1, 32000)
p = NetBIOSPacket()
p.set_trn_id(trn_id)
netbios_name = nbname.upper()
qn_label = encode_name(netbios_name, qtype, scope)
p.addQuestion(qn_label, QUESTION_TYPE_NB, QUESTION_CLASS_IN)
p.set_nm_flags(NM_FLAGS_RD)
if not destaddr:
p.set_nm_flags(p.get_nm_flags() | NM_FLAGS_BROADCAST)
destaddr = self.__broadcastaddr
req = p.rawData()
tries = retries
while 1:
self.__sock.sendto(req, ( destaddr, self.__servport ))
try:
ready, _, _ = select.select([ self.__sock.fileno() ], [ ] , [ ], timeout)
if not ready:
if tries:
# Retry again until tries == 0
tries -= 1
else:
raise NetBIOSTimeout
else:
data, _ = self.__sock.recvfrom(65536, 0)
res = NetBIOSPacket(data)
if res.get_trn_id() == p.get_trn_id():
if res.get_rcode():
if res.get_rcode() == 0x03:
return None
else:
raise NetBIOSError( 'Negative name query response', ERRCLASS_QUERY, res.get_rcode())
if res.get_ancount() != 1:
raise NetBIOSError( 'Malformed response')
return NBPositiveNameQueryResponse(res.get_answers())
except select.error as ex:
if ex[0] != errno.EINTR and ex[0] != errno.EAGAIN:
raise NetBIOSError( 'Error occurs while waiting for response', ERRCLASS_OS, ex[0])
raise
def __querynodestatus(self, nbname, destaddr, type, scope, timeout):
self._setup_connection(destaddr)
trn_id = randint(1, 32000)
p = NetBIOSPacket()
p.set_trn_id(trn_id)
netbios_name = string.upper(nbname)
qn_label = encode_name(netbios_name, type, scope)
p.addQuestion(qn_label, QUESTION_TYPE_NBSTAT, QUESTION_CLASS_IN)
if not destaddr:
p.set_nm_flags(NM_FLAGS_BROADCAST)
destaddr = self.__broadcastaddr
req = p.rawData()
tries = 3
while 1:
try:
self.__sock.sendto(req, 0, ( destaddr, self.__servport ))
ready, _, _ = select.select([ self.__sock.fileno() ], [ ] , [ ], timeout)
if not ready:
if tries:
# Retry again until tries == 0
tries -= 1
else:
raise NetBIOSTimeout
else:
try:
data, _ = self.__sock.recvfrom(65536, 0)
except Exception as e:
raise NetBIOSError("recvfrom error: %s" % str(e))
self.__sock.close()
res = NetBIOSPacket(data)
if res.get_trn_id() == p.get_trn_id():
if res.get_rcode():
if res.get_rcode() == 0x03:
# I'm just guessing here
raise NetBIOSError("Cannot get data from server")
else:
raise NetBIOSError( 'Negative name query response', ERRCLASS_QUERY, res.get_rcode())
answ = NBNodeStatusResponse(res.get_answers())
self.mac = answ.get_mac()
return answ.get_node_names()
except select.error as ex:
if ex[0] != errno.EINTR and ex[0] != errno.EAGAIN:
raise NetBIOSError( 'Error occurs while waiting for response', ERRCLASS_OS, ex[0])
except socket.error as ex:
raise NetBIOSError('Connection error: %s' % str(ex))
# Perform first and second level encoding of name as specified in RFC 1001 (Section 4)
def encode_name(name, type, scope):
if name == '*':
name += '\0' * 15
elif len(name) > 15:
name = name[:15] + chr(type)
else:
name = string.ljust(name, 15) + chr(type)
encoded_name = chr(len(name) * 2) + re.sub('.', _do_first_level_encoding, name)
if scope:
encoded_scope = ''
for s in string.split(scope, '.'):
encoded_scope = encoded_scope + chr(len(s)) + s
return encoded_name + encoded_scope + '\0'
else:
return encoded_name + '\0'
# Internal method for use in encode_name()
def _do_first_level_encoding(m):
s = ord(m.group(0))
return string.uppercase[s >> 4] + string.uppercase[s & 0x0f]
def decode_name(name):
name_length = ord(name[0])
assert name_length == 32
decoded_name = re.sub('..', _do_first_level_decoding, name[1:33])
if name[33] == '\0':
return 34, decoded_name, ''
else:
decoded_domain = ''
offset = 34
while 1:
domain_length = ord(name[offset])
if domain_length == 0:
break
decoded_domain = '.' + name[offset:offset + domain_length]
offset += domain_length
return offset + 1, decoded_name, decoded_domain
def _do_first_level_decoding(m):
s = m.group(0)
return chr(((ord(s[0]) - ord('A')) << 4) | (ord(s[1]) - ord('A')))
class NetBIOSSessionPacket:
def __init__(self, data = 0):
self.type = 0x0
self.flags = 0x0
self.length = 0x0
if data == 0:
self._trailer = ''
else:
try:
self.type = ord(data[0])
if self.type == NETBIOS_SESSION_MESSAGE:
self.length = ord(data[1]) << 16 | (unpack('!H', data[2:4])[0])
else:
self.flags = ord(data[1])
self.length = unpack('!H', data[2:4])[0]
self._trailer = data[4:]
except:
raise NetBIOSError( 'Wrong packet format ' )
def set_type(self, type):
self.type = type
def get_type(self):
return self.type
def rawData(self):
if self.type == NETBIOS_SESSION_MESSAGE:
data = pack('!BBH',self.type,self.length >> 16,self.length & 0xFFFF) + self._trailer
else:
data = pack('!BBH',self.type,self.flags,self.length) + self._trailer
return data
def set_trailer(self,data):
self._trailer = data
self.length = len(data)
def get_length(self):
return self.length
def get_trailer(self):
return self._trailer
class NetBIOSSession:
def __init__(self, myname, remote_name, remote_host, remote_type = TYPE_SERVER, sess_port = NETBIOS_SESSION_PORT, timeout = None, local_type = TYPE_WORKSTATION, sock = None):
if len(myname) > 15:
self.__myname = string.upper(myname[:15])
else:
self.__myname = string.upper(myname)
self.__local_type = local_type
assert remote_name
# if destination port SMB_SESSION_PORT and remote name *SMBSERVER, we're changing it to its IP address
# helping solving the client mistake ;)
if remote_name == '*SMBSERVER' and sess_port == SMB_SESSION_PORT:
remote_name = remote_host
# If remote name is *SMBSERVER let's try to query its name.. if can't be guessed, continue and hope for the best
if remote_name == '*SMBSERVER':
nb = NetBIOS()
try:
res = nb.getnetbiosname(remote_host)
except:
res = None
pass
if res is not None:
remote_name = res
if len(remote_name) > 15:
self.__remote_name = string.upper(remote_name[:15])
else:
self.__remote_name = string.upper(remote_name)
self.__remote_type = remote_type
self.__remote_host = remote_host
if sock is not None:
# We are acting as a server
self._sock = sock
else:
self._sock = self._setup_connection((remote_host, sess_port))
if sess_port == NETBIOS_SESSION_PORT:
self._request_session(remote_type, local_type, timeout)
def get_myname(self):
return self.__myname
def get_mytype(self):
return self.__local_type
def get_remote_host(self):
return self.__remote_host
def get_remote_name(self):
return self.__remote_name
def get_remote_type(self):
return self.__remote_type
def close(self):
self._sock.close()
def get_socket(self):
return self._sock
class NetBIOSUDPSessionPacket(Structure):
TYPE_DIRECT_UNIQUE = 16
TYPE_DIRECT_GROUP = 17
FLAGS_MORE_FRAGMENTS = 1
FLAGS_FIRST_FRAGMENT = 2
FLAGS_B_NODE = 0
structure = (
('Type','B=16'), # Direct Unique Datagram
('Flags','B=2'), # FLAGS_FIRST_FRAGMENT
('ID','<H'),
('_SourceIP','>L'),
('SourceIP','"'),
('SourcePort','>H=138'),
('DataLegth','>H-Data'),
('Offset','>H=0'),
('SourceName','z'),
('DestinationName','z'),
('Data',':'),
)
def getData(self):
addr = self['SourceIP'].split('.')
addr = [int(x) for x in addr]
addr = (((addr[0] << 8) + addr[1] << 8) + addr[2] << 8) + addr[3]
self['_SourceIP'] = addr
return Structure.getData(self)
def get_trailer(self):
return self['Data']
class NetBIOSUDPSession(NetBIOSSession):
def _setup_connection(self, peer):
af, socktype, proto, canonname, sa = socket.getaddrinfo(peer[0], peer[1], 0, socket.SOCK_DGRAM)[0]
sock = socket.socket(af, socktype, proto)
sock.connect(sa)
sock = socket.socket(af, socktype, proto)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind((INADDR_ANY, 138))
self.peer = peer
return sock
def _request_session(self, remote_type, local_type, timeout = None):
pass
def next_id(self):
if hasattr(self, '__dgram_id'):
answer = self.__dgram_id
else:
self.__dgram_id = randint(1,65535)
answer = self.__dgram_id
self.__dgram_id += 1
return answer
def send_packet(self, data):
# Yes... I know...
self._sock.connect(self.peer)
p = NetBIOSUDPSessionPacket()
p['ID'] = self.next_id()
p['SourceIP'] = self._sock.getsockname()[0]
p['SourceName'] = encode_name(self.get_myname(), self.get_mytype(), '')[:-1]
p['DestinationName'] = encode_name(self.get_remote_name(), self.get_remote_type(), '')[:-1]
p['Data'] = data
self._sock.sendto(str(p), self.peer)
self._sock.close()
self._sock = self._setup_connection(self.peer)
def recv_packet(self, timeout = None):
# The next loop is a workaround for a bigger problem:
# When data reaches higher layers, the lower headers are lost,
# and with them, for example, the source IP. Hence, SMB users
# can't know where packets are comming from... we need a better
# solution, right now, we will filter everything except packets
# coming from the remote_host specified in __init__()
while 1:
data, peer = self._sock.recvfrom(8192)
# print "peer: %r self.peer: %r" % (peer, self.peer)
if peer == self.peer: break
return NetBIOSUDPSessionPacket(data)
class NetBIOSTCPSession(NetBIOSSession):
def __init__(self, myname, remote_name, remote_host, remote_type = TYPE_SERVER, sess_port = NETBIOS_SESSION_PORT, timeout = None, local_type = TYPE_WORKSTATION, sock = None, select_poll = False):
self.__select_poll = select_poll
if self.__select_poll:
self.read_function = self.polling_read
else:
self.read_function = self.non_polling_read
NetBIOSSession.__init__(self, myname, remote_name, remote_host, remote_type = remote_type, sess_port = sess_port, timeout = timeout, local_type = local_type, sock=sock)
def _setup_connection(self, peer):
try:
af, socktype, proto, canonname, sa = socket.getaddrinfo(peer[0], peer[1], 0, socket.SOCK_STREAM)[0]
sock = socket.socket(af, socktype, proto)
sock.connect(sa)
except socket.error as e:
raise socket.error("Connection error (%s:%s)" % (peer[0], peer[1]), e)
return sock
def send_packet(self, data):
p = NetBIOSSessionPacket()
p.set_type(NETBIOS_SESSION_MESSAGE)
p.set_trailer(data)
self._sock.send(p.rawData())
def recv_packet(self, timeout = None):
data = self.__read(timeout)
return NetBIOSSessionPacket(data)
def _request_session(self, remote_type, local_type, timeout = None):
p = NetBIOSSessionPacket()
remote_name = encode_name(self.get_remote_name(), remote_type, '')
myname = encode_name(self.get_myname(), local_type, '')
p.set_type(NETBIOS_SESSION_REQUEST)
p.set_trailer(remote_name + myname)
self._sock.send(p.rawData())
while 1:
p = self.recv_packet(timeout)
if p.get_type() == NETBIOS_SESSION_NEGATIVE_RESPONSE:
raise NetBIOSError( 'Cannot request session', ERRCLASS_SESSION, ord(p.get_trailer()[0]))
elif p.get_type() == NETBIOS_SESSION_POSITIVE_RESPONSE:
break
else:
# Ignore all other messages, most probably keepalive messages
pass
def polling_read(self, read_length, timeout):
data = ''
if timeout is None:
timeout = 3600
time_left = timeout
CHUNK_TIME = 0.025
bytes_left = read_length
while bytes_left > 0:
try:
ready, _, _ = select.select([self._sock.fileno() ], [ ], [ ], 0)
if not ready:
if time_left <= 0:
raise NetBIOSTimeout
else:
time.sleep(CHUNK_TIME)
time_left -= CHUNK_TIME
continue
received = self._sock.recv(bytes_left)
if len(received) == 0:
raise NetBIOSError( 'Error while reading from remote', ERRCLASS_OS, None)
data = data + received
bytes_left = read_length - len(data)
except select.error as ex:
if ex[0] != errno.EINTR and ex[0] != errno.EAGAIN:
raise NetBIOSError( 'Error occurs while reading from remote', ERRCLASS_OS, ex[0])
return data
def non_polling_read(self, read_length, timeout):
data = ''
bytes_left = read_length
while bytes_left > 0:
try:
ready, _, _ = select.select([self._sock.fileno() ], [ ], [ ], timeout)
if not ready:
raise NetBIOSTimeout
received = self._sock.recv(bytes_left)
if len(received) == 0:
raise NetBIOSError( 'Error while reading from remote', ERRCLASS_OS, None)
data = data + received
bytes_left = read_length - len(data)
except select.error as ex:
if ex[0] != errno.EINTR and ex[0] != errno.EAGAIN:
raise NetBIOSError( 'Error occurs while reading from remote', ERRCLASS_OS, ex[0])
return data
def __read(self, timeout = None):
data = self.read_function(4, timeout)
type, flags, length = unpack('>ccH', data)
if ord(type) == NETBIOS_SESSION_MESSAGE:
length |= ord(flags) << 16
else:
if ord(flags) & 0x01:
length |= 0x10000
data2 = self.read_function(length, timeout)
return data + data2
ERRCLASS_QUERY = 0x00
ERRCLASS_SESSION = 0xf0
ERRCLASS_OS = 0xff
QUERY_ERRORS = { 0x01: 'Request format error. Please file a bug report.',
0x02: 'Internal server error',
0x03: 'Name does not exist',
0x04: 'Unsupported request',
0x05: 'Request refused'
}
SESSION_ERRORS = { 0x80: 'Not listening on called name',
0x81: 'Not listening for calling name',
0x82: 'Called name not present',
0x83: 'Sufficient resources',
0x8f: 'Unspecified error'
}
def main():
def get_netbios_host_by_name(name):
n = NetBIOS()
n.set_broadcastaddr('255.255.255.255') # To avoid use "<broadcast>" in socket
for qtype in (TYPE_WORKSTATION, TYPE_CLIENT, TYPE_SERVER, TYPE_DOMAIN_MASTER, TYPE_DOMAIN_CONTROLLER):
try:
addrs = n.gethostbyname(name, qtype = qtype).get_addr_entries()
except NetBIOSTimeout:
continue
else:
return addrs
raise Exception("Host not found")
n = get_netbios_host_by_name("some-host")
print(n)
if __name__ == '__main__':
main()
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