def SendDhcpPacket(self, request, response):
giaddr = ".".join(map(str, request.GetOption("giaddr")))
ciaddr = ".".join(map(str, request.GetOption("ciaddr")))
yiaddr = ".".join(map(str, response.GetOption("yiaddr")))
chaddr = struct.pack(6*"B", *request.GetOption("chaddr")[0:6])
broadcast = request.GetOption("flags")[0] != 0
if (giaddr != "0.0.0.0"):
self.SendDhcpPacketTo(response, giaddr, self.listen_port)
elif (ciaddr != "0.0.0.0"):
self.SendDhcpPacketTo(response, ciaddr, self.emit_port)
elif (broadcast):
self.SendDhcpPacketTo(response, "255.255.255.255", self.emit_port)
else:
ifconfig = interface.interface()
ifindex = ifconfig.getIndex(self.ifname)
ifaddr = ifconfig.getAddr(self.ifname)
_rawsocket.udp_send_packet( response.EncodePacket(),
type_ipv4.ipv4(ifaddr).int(),
self.listen_port,
type_ipv4.ipv4(yiaddr).int(),
self.emit_port,
chaddr,
ifindex
)
def SendDhcpPacket(self, request, response):
giaddr = ".".join(map(str, request.GetOption("giaddr")))
ciaddr = ".".join(map(str, request.GetOption("ciaddr")))
yiaddr = ".".join(map(str, response.GetOption("yiaddr")))
chaddr = struct.pack(6 * "B", *request.GetOption("chaddr")[0:6])
broadcast = request.GetOption("flags")[0] != 0
if (giaddr != "0.0.0.0"):
self.SendDhcpPacketTo(response, giaddr, self.listen_port)
elif (response.IsDhcpNackPacket()):
self.SendDhcpPacketTo(response, "255.255.255.255", self.emit_port)
elif (ciaddr != "0.0.0.0"):
self.SendDhcpPacketTo(response, ciaddr, self.emit_port)
elif (broadcast):
self.SendDhcpPacketTo(response, "255.255.255.255", self.emit_port)
else: # unicast to yiaddr
ifconfig = interface.interface()
ifindex = ifconfig.getIndex(self.ifname)
ifaddr = ifconfig.getAddr(self.ifname)
if (ifaddr is None):
ifaddr = "0.0.0.0"
_rawsocket.udp_send_packet(response.EncodePacket(),
type_ipv4.ipv4(ifaddr).int(),
self.listen_port,
type_ipv4.ipv4(yiaddr).int(),
self.emit_port, chaddr, ifindex)
def extractVendorOptions(self):
"""
Strips out vendor-specific options from the packet, returning them
separately.
This function is good for scrubbing information that needs to be sent
monodirectionally from the client.
@rtype: tuple(4)
@return: A four-tuple containing, in order, option 43
(vendor_specific_information) as a string of bytes, option 60
(vendor_class_identifier) as a string, and both option 124
(vendor_class) and option 125 (vendor_specific) as digested data:
[(enterprise_number:int, data:string)] and
[(enterprise_number:int, [(subopt_code:byte, data:string)])],
respectively. Any unset options are presented as None.
"""
opt_43 = self.getOption("vendor_specific_information")
opt_60 = self.getOption("vendor_class_identifier")
opt_124 = self.getOption("vendor_class")
opt_125 = self.getOption("vendor_specific")
if opt_124:
data = []
while opt_124:
enterprise_number = ipv4(opt_124[:4]).int()
opt_124 = opt_124[4:]
payload_size = ord(opt_124[0])
payload = opt_124[1:1 + payload_size]
opt_124 = opt_124[1 + payload_size:]
data.append(enterprise_number, payload)
opt_124 = data
if opt_125:
data = []
while opt_125:
enterprise_number = ipv4(opt_125[:4]).int()
opt_125 = opt_125[4:]
payload_size = ord(opt_125[0])
payload = opt_125[1:1 + payload_size]
opt_125 = opt_125[1 + payload_size:]
subdata = []
while payload:
subopt = ord(payload[0])
subopt_size = ord(payload[1])
subpayload = payload[2:2 + subopt_size]
payload = payload[2 + subopt_size:]
subdata.append(subopt, subpayload)
data.append(enterprise_number, subdata)
opt_125 = data
self.deleteOption("vendor_specific_information")
self.deleteOption("vendor_class_identifier")
self.deleteOption("vendor_class")
self.deleteOption("vendor_specific")
return (opt_43, opt_60, opt_124, opt_125)
def _OptionsToBinary(self, parameter, value):
# Transform textual data into dhcp binary data
p = parameter.strip()
# 1- Search for header informations or specific parameter
if p == 'op' or p == 'htype':
value = value.strip()
if value.isdigit(): return [int(value)]
try:
value = DhcpNames[value.strip()]
return [value]
except KeyError:
return [0]
elif p == 'hlen' or p == 'hops':
try:
value = int(value)
return [value]
except ValueError:
return [0]
elif p == 'secs' or p == 'flags':
try:
value = ipv4(int(value)).list()
except ValueError:
value = [0, 0, 0, 0]
return value[2:]
elif p == 'xid':
try:
value = ipv4(int(value)).list()
except ValueError:
value = [0, 0, 0, 0]
return value
elif p == 'ciaddr' or p == 'yiaddr' or p == 'siaddr' or p == 'giaddr':
try:
ip = ipv4(value).list()
except ValueError:
ip = [0, 0, 0, 0]
return ip
elif p == 'chaddr':
try:
value = hwmac(value).list() + [0] * 10
except ValueError, TypeError:
value = [0] * 16
return value
def _OptionsToBinary(self,parameter,value) :
# Transform textual data into dhcp binary data
p = parameter.strip()
# 1- Search for header informations or specific parameter
if p == 'op' or p == 'htype' :
value = value.strip()
if value.isdigit() : return [int(value)]
try :
value = DhcpNames[value.strip()]
return [value]
except KeyError :
return [0]
elif p == 'hlen' or p == 'hops' :
try :
value = int(value)
return [value]
except ValueError :
return [0]
elif p == 'secs' or p == 'flags' :
try :
value = ipv4(int(value)).list()
except ValueError :
value = [0,0,0,0]
return value[2:]
elif p == 'xid' :
try :
value = ipv4(int(value)).list()
except ValueError :
value = [0,0,0,0]
return value
elif p == 'ciaddr' or p == 'yiaddr' or p == 'siaddr' or p == 'giaddr' :
try :
ip = ipv4(value).list()
except ValueError :
ip = [0,0,0,0]
return ip
elif p == 'chaddr' :
try:
value = hwmac(value).list()+[0]*10
except ValueError,TypeError :
value = [0]*16
return value
def __init__(self, data):
"""
Parses the given data and stores multiple IPv4 addresses or
RFC1035-formatted strings.
@type data: basestring
@param data: The comma-delimited IPv4s or FQDNs to process.
@raise ValueError: Both IPv4s and FQDNs were specified.
"""
ip_4_mode = False
dns_mode = False
self._value = []
for token in [tok for tok in [t.strip() for t in data.split(',')] if tok]:
try:
self._value += type_ipv4.ipv4(token).list()
ip_4_mode = True
except ValueError:
self._value += _rfc1035Parse(token)
dns_mode = True
if ip_4_mode == dns_mode:
raise ValueError("'%(data)s contains both IPv4 and DNS-based entries" % {
'data': data,
})
self._value.insert(0, int(ip_4_mode))
def PrintHeaders(self):
print "# Header fields\n"
print "readable_dhcp_headers = {"
for opt in ['op','htype','hlen','hops','xid','secs','flags',
'ciaddr','yiaddr','siaddr','giaddr','chaddr','sname','file'] :
begin = DhcpFields[opt][0]
end = DhcpFields[opt][0]+DhcpFields[opt][1]
data = self.packet_data[begin:end]
if DhcpFieldsTypes[opt] == "int" : result = str(data[0])
if DhcpFieldsTypes[opt] == "int2" : result = str(data[0]*256+data[0])
if DhcpFieldsTypes[opt] == "int4" : result = str(ipv4(data).int())
if DhcpFieldsTypes[opt] == "str" : result = strlist(data).str()
if DhcpFieldsTypes[opt] == "ipv4" : result = ipv4(data).str()
if DhcpFieldsTypes[opt] == "hwmac" : result = "".join(map(chr,data))
line = "\t'"+opt+"':"+str(data)+",\t# "+result
print line
print "\t'end':'true'}"
def PrintHeaders(self):
print "# Header fields\n"
print "readable_dhcp_headers = {"
for opt in ['op','htype','hlen','hops','xid','secs','flags',
'ciaddr','yiaddr','siaddr','giaddr','chaddr','sname','file'] :
begin = DhcpFields[opt][0]
end = DhcpFields[opt][0]+DhcpFields[opt][1]
data = self.packet_data[begin:end]
if DhcpFieldsTypes[opt] == "int" : result = str(data[0])
if DhcpFieldsTypes[opt] == "int2" : result = str(data[0]*256+data[0])
if DhcpFieldsTypes[opt] == "int4" : result = str(ipv4(data).int())
if DhcpFieldsTypes[opt] == "str" : result = strlist(data).str()
if DhcpFieldsTypes[opt] == "ipv4" : result = ipv4(data).str()
if DhcpFieldsTypes[opt] == "hwmac" : result = "".join(map(chr,data))
line = "\t'"+opt+"':"+str(data)+",\t# "+result
print line
print "\t'end':'true'}"
def PrintOptions(self):
print "# Options fields"
print "readable_dhcp_options = {"
for opt in self.options_data.keys():
data = self.options_data[opt]
result = ""
optnum = DhcpOptions[opt]
if DhcpOptionsTypes[optnum] == "char" : result = str(data[0])
if DhcpOptionsTypes[optnum] == "16-bits" : result = str(data[0]*256+data[0])
if DhcpOptionsTypes[optnum] == "32bits" : result = str(ipv4(data).int())
if DhcpOptionsTypes[optnum] == "string" : result = strlist(data).str()
if DhcpOptionsTypes[optnum] == "ipv4" : result = ipv4(data).str()
if DhcpOptionsTypes[optnum] == "ipv4+" :
for i in range(0,len(data),4) :
if len(data[i:i+4]) == 4 :
result += ipv4(data[i:i+4]).str() + " - "
line = "\t'"+opt+"':"+str(data)+",\t# "+result
print line
print "\t'end':'true'}"
def PrintOptions(self):
print "# Options fields"
print "readable_dhcp_options = {"
for opt in self.options_data.keys():
data = self.options_data[opt]
result = ""
optnum = DhcpOptions[opt]
if DhcpOptionsTypes[optnum] == "char" : result = str(data[0])
if DhcpOptionsTypes[optnum] == "16-bits" : result = str(data[0]*256+data[0])
if DhcpOptionsTypes[optnum] == "32bits" : result = str(ipv4(data).int())
if DhcpOptionsTypes[optnum] == "string" : result = strlist(data).str()
if DhcpOptionsTypes[optnum] == "ipv4" : result = ipv4(data).str()
if DhcpOptionsTypes[optnum] == "ipv4+" :
for i in range(0,len(data),4) :
if len(data[i:i+4]) == 4 :
result += ipv4(data[i:i+4]).str() + " - "
line = "\t'"+opt+"':"+str(data)+",\t# "+result
print line
print "\t'end':'true'}"
def __init__(self, mandatory, data):
"""
Parses the given data and stores multiple IPv4 addresses.
@type mandatory: bool
@param mandatory: True if the IPv4 addresses have to be respected.
@type data: basestring
@param data: The comma-delimited IPv4s to process.
"""
self._value = [int(mandatory)]
for token in [tok for tok in [t.strip() for t in data.split(',')] if tok]:
self._value += type_ipv4.ipv4(token).list()
def __init__(self, values):
"""
Parses the given data and stores multiple IPv4 addresses
associated with sub-option codes.
@type values: tuple
@param values: A collection of (code:int, IPv4s:string) elements.
"""
self._value = []
for (code, addresses) in values:
self._value.append(code)
for token in [tok for tok in [address.strip() for address in addresses.split(',')] if tok]:
self._value += type_ipv4.ipv4(token).list()
def PrintHeaders(self):
print "# Header fields\n"
print "readable_dhcp_headers = {"
for opt in [
"op",
"htype",
"hlen",
"hops",
"xid",
"secs",
"flags",
"ciaddr",
"yiaddr",
"siaddr",
"giaddr",
"chaddr",
"sname",
"file",
]:
begin = DhcpFields[opt][0]
end = DhcpFields[opt][0] + DhcpFields[opt][1]
data = self.packet_data[begin:end]
if DhcpFieldsTypes[opt] == "int":
result = str(data[0])
if DhcpFieldsTypes[opt] == "int2":
result = str(data[0] * 256 + data[0])
if DhcpFieldsTypes[opt] == "int4":
result = str(ipv4(data).int())
if DhcpFieldsTypes[opt] == "str":
result = strlist(data).str()
if DhcpFieldsTypes[opt] == "ipv4":
result = ipv4(data).str()
if DhcpFieldsTypes[opt] == "hwmac":
result = "".join(map(chr, data))
line = "\t'" + opt + "':" + str(data) + ",\t# " + result
print line
print "\t'end':'true'}"
def __init__(self, isns_functions, dd_access, admin_flags, isns_security, ips):
"""
Sets iSNS configuration parameters.
@type isns_functions: int
@param isns_functions: Two bytes.
@type dd_access: int
@param dd_access: Two bytes.
@type admin_flags: int
@param admin_flags: Two bytes.
@type isns_security: int
@param isns_security: Four bytes.
@type ips: basestring
@param ips: The comma-delimited IPv4s to process.
"""
isns_functions = intToList(isns_functions)
dd_access = intToList(dd_access)
admin_flags = intToList(admin_flags)
isns_security = longToList(isns_security)
self._value = isns_functions + dd_access + admin_flags + isns_security
for token in [tok for tok in [t.strip() for t in ips.split(',')] if tok]:
self._value += type_ipv4.ipv4(token).list()
def _decode_ipv4(self, data, data_len):
# spec: fixed_len: 4, min_len: 4, multiplicator: 0
if len(data) == 4 and data_len == 4:
return ipv4(data)
return None
# 2- Search for options
try : option_type = DhcpOptionsTypes[DhcpOptions[parameter]]
except KeyError : return False
if option_type == "ipv4" :
# this is a single ip address
try :
binary_value = map(int,value.split("."))
except ValueError : return False
elif option_type == "ipv4+" :
# this is multiple ip address
iplist = value.split(",")
opt = []
for single in iplist :
opt += (ipv4(single).list())
binary_value = opt
elif option_type == "32-bits" :
# This is probably a number...
try :
digit = int(value)
binary_value = [digit>>24&0xFF,(digit>>16)&0xFF,(digit>>8)&0xFF,digit&0xFF]
except ValueError :
return False
elif option_type == "16-bits" :
try :
digit = int(value)
binary_value = [(digit>>8)&0xFF,digit&0xFF]
except ValueError : return False
def str(self):
# Process headers :
printable_data = "# Header fields\n"
op = self.packet_data[DhcpFields['op'][0]:DhcpFields['op'][0]+DhcpFields['op'][1]]
printable_data += "op : " + DhcpFieldsName['op'][str(op[0])] + "\n"
for opt in ['htype','hlen','hops','xid','secs','flags',
'ciaddr','yiaddr','siaddr','giaddr','chaddr','sname','file'] :
begin = DhcpFields[opt][0]
end = DhcpFields[opt][0]+DhcpFields[opt][1]
data = self.packet_data[begin:end]
result = ''
if DhcpFieldsTypes[opt] == "int" : result = str(data[0])
elif DhcpFieldsTypes[opt] == "int2" : result = str(data[0]*256+data[1])
elif DhcpFieldsTypes[opt] == "int4" : result = str(ipv4(data).int())
elif DhcpFieldsTypes[opt] == "str" :
for each in data :
if each != 0 : result += chr(each)
else : break
elif DhcpFieldsTypes[opt] == "ipv4" : result = ipv4(data).str()
elif DhcpFieldsTypes[opt] == "hwmac" :
result = []
hexsym = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f']
for iterator in range(6) :
result += [str(hexsym[data[iterator]/16]+hexsym[data[iterator]%16])]
result = ':'.join(result)
printable_data += opt+" : "+result + "\n"
# Process options :
printable_data += "# Options fields\n"
for opt in self.options_data.keys():
data = self.options_data[opt]
result = ""
optnum = DhcpOptions[opt]
if opt=='dhcp_message_type' : result = DhcpFieldsName['dhcp_message_type'][str(data[0])]
elif DhcpOptionsTypes[optnum] == "char" : result = str(data[0])
elif DhcpOptionsTypes[optnum] == "16-bits" : result = str(data[0]*256+data[0])
elif DhcpOptionsTypes[optnum] == "32-bits" : result = str(ipv4(data).int())
elif DhcpOptionsTypes[optnum] == "string" :
for each in data :
if each != 0 : result += chr(each)
else : break
elif DhcpOptionsTypes[optnum] == "ipv4" : result = ipv4(data).str()
elif DhcpOptionsTypes[optnum] == "ipv4+" :
for i in range(0,len(data),4) :
if len(data[i:i+4]) == 4 :
result += ipv4(data[i:i+4]).str() + " - "
elif DhcpOptionsTypes[optnum] == "char+" :
if optnum == 55 : # parameter_request_list
result = ','.join([DhcpOptionsList[each] for each in data])
else : result += str(data)
printable_data += opt + " : " + result + "\n"
return printable_data
def __str__(self):
"""
Renders this packet's data in human-readable form.
@rtype: str
@return: A human-readable summary of this packet.
"""
output = ['#Header fields']
op = self._packet_data[DHCP_FIELDS['op'][0]:DHCP_FIELDS['op'][0] + DHCP_FIELDS['op'][1]]
output.append("op: %(type)s" % {
'type': DHCP_FIELDS_NAMES['op'][op[0]],
})
for opt in (
'htype','hlen','hops','xid','secs','flags',
'ciaddr','yiaddr','siaddr','giaddr','chaddr',
'sname','file',
):
begin = DHCP_FIELDS[opt][0]
end = DHCP_FIELDS[opt][0] + DHCP_FIELDS[opt][1]
data = self._packet_data[begin:end]
result = None
if DHCP_FIELDS_TYPES[opt] == "byte":
result = str(data[0])
elif DHCP_FIELDS_TYPES[opt] == "16-bits":
result = str(data[0] * 256 + data[1])
elif DHCP_FIELDS_TYPES[opt] == "32-bits":
result = str(ipv4(data).int())
elif DHCP_FIELDS_TYPES[opt] == "string":
result = []
for c in data:
if c:
result.append(chr(c))
else:
break
result = ''.join(result)
elif DHCP_FIELDS_TYPES[opt] == "ipv4":
result = ipv4(data).str()
elif DHCP_FIELDS_TYPES[opt] == "hwmac":
result = []
hexsym = ('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f',)
for iterator in xrange(6):
result.append(str(hexsym[data[iterator] / 16] + hexsym[data[iterator] % 16]))
result = ':'.join(result)
output.append("%(opt)s: %(result)s" % {
'opt': opt,
'result': result,
})
output.append('')
output.append("#Options fields")
for opt in self._options_data.keys():
data = self._options_data[opt]
result = None
optnum = DHCP_OPTIONS[opt]
if opt == 'dhcp_message_type':
result = DHCP_FIELDS_NAMES['dhcp_message_type'][data[0]]
elif DHCP_OPTIONS_TYPES[optnum] in ("byte", "byte+", "string"):
result = str(data)
elif DHCP_OPTIONS_TYPES[optnum] in ("char", "char+"):
if optnum == 55: # parameter_request_list
requested_options = []
for d in data:
requested_options.append(DHCP_OPTIONS_REVERSE[int(d)])
result = ', '.join(requested_options)
else:
result = []
for c in data:
if 32 <= c <= 126:
result.append(chr(c))
else:
result.append(str(c))
result = ', '.join(result)
elif DHCP_OPTIONS_TYPES[optnum] in ("16-bits", "16-bits+"):
result = []
for i in xrange(0, len(data), 2):
result.append(str(data[i] * 256 + data[i + 1]))
result = ', '.join(result)
elif DHCP_OPTIONS_TYPES[optnum] in ("32-bits", "32-bits+"):
result = []
for i in xrange(0, len(data), 4):
result.append(str(ipv4(data[i:i+4]).int()))
result = ', '.join(result)
elif DHCP_OPTIONS_TYPES[optnum] in ("ipv4", "ipv4+", "ipv4*"):
result = []
for i in xrange(0, len(data), 4):
result.append(ipv4(data[i:i+4]).str())
result = ', '.join(result)
else:
result = str(data)
output.append("%(opt)s: %(result)s" % {
'opt': opt,
'result': result,
})
return '\n'.join(output)
except KeyError:
return False
if option_type == "ipv4":
# this is a single ip address
try:
binary_value = map(int, value.split("."))
except ValueError:
return False
elif option_type == "ipv4+":
# this is multiple ip address
iplist = value.split(",")
opt = []
for single in iplist:
opt += (ipv4(single).list())
binary_value = opt
elif option_type == "32-bits":
# This is probably a number...
try:
digit = int(value)
binary_value = [
digit >> 24 & 0xFF, (digit >> 16) & 0xFF,
(digit >> 8) & 0xFF, digit & 0xFF
]
except ValueError:
return False
elif option_type == "16-bits":
try:
def _OptionsToBinary(self, parameter, value):
# Transform textual data into dhcp binary data
p = parameter.strip()
# 1- Search for header informations or specific parameter
if p == 'op' or p == 'htype':
value = value.strip()
if value.isdigit(): return [int(value)]
try:
value = DhcpNames[value.strip()]
return [value]
except KeyError:
return [0]
elif p == 'hlen' or p == 'hops':
try:
value = int(value)
return [value]
except ValueError:
return [0]
elif p == 'secs' or p == 'flags':
try:
value = ipv4(int(value)).list()
except ValueError:
value = [0, 0, 0, 0]
return value[2:]
elif p == 'xid':
try:
value = ipv4(int(value)).list()
except ValueError:
value = [0, 0, 0, 0]
return value
elif p == 'ciaddr' or p == 'yiaddr' or p == 'siaddr' or p == 'giaddr':
try:
ip = ipv4(value).list()
except ValueError:
ip = [0, 0, 0, 0]
return ip
elif p == 'chaddr':
try:
value = hwmac(value).list() + [0] * 10
except (ValueError, TypeError):
value = [0] * 16
return value
elif p == 'sname':
return
elif p == 'file':
return
elif p == 'parameter_request_list':
value = value.strip().split(',')
tmp = []
for each in value:
if DhcpOptions.has_key(each): tmp.append(DhcpOptions[each])
return tmp
elif p == 'dhcp_message_type':
try:
return [DhcpNames[value]]
except KeyError:
return
# 2- Search for options
try:
option_type = DhcpOptionsTypes[DhcpOptions[parameter]]
except KeyError:
return False
if option_type == "ipv4":
# this is a single ip address
try:
binary_value = map(int, value.split("."))
except ValueError:
return False
elif option_type == "ipv4+":
# this is multiple ip address
iplist = value.split(",")
opt = []
for single in iplist:
opt += (ipv4(single).list())
binary_value = opt
elif option_type == "32-bits":
# This is probably a number...
try:
digit = int(value)
binary_value = [
digit >> 24 & 0xFF, (digit >> 16) & 0xFF,
(digit >> 8) & 0xFF, digit & 0xFF
]
except ValueError:
return False
elif option_type == "16-bits":
try:
digit = int(value)
binary_value = [(digit >> 8) & 0xFF, digit & 0xFF]
except ValueError:
return False
elif option_type == "char":
try:
digit = int(value)
binary_value = [digit & 0xFF]
except ValueError:
return False
elif option_type == "bool":
if value == "False" or value == "false" or value == 0:
binary_value = [0]
else:
binary_value = [1]
elif option_type == "string":
binary_value = strlist(value).list()
else:
binary_value = strlist(value).list()
return binary_value
def str(self):
# Process headers :
printable_data = "# Header fields\n"
op = self.packet_data[DhcpFields['op'][0]:DhcpFields['op'][0] +
DhcpFields['op'][1]]
printable_data += "op : " + DhcpFieldsName['op'][str(op[0])] + "\n"
for opt in [
'htype', 'hlen', 'hops', 'xid', 'secs', 'flags', 'ciaddr',
'yiaddr', 'siaddr', 'giaddr', 'chaddr', 'sname', 'file'
]:
begin = DhcpFields[opt][0]
end = DhcpFields[opt][0] + DhcpFields[opt][1]
data = self.packet_data[begin:end]
result = ''
if DhcpFieldsTypes[opt] == "int": result = str(data[0])
elif DhcpFieldsTypes[opt] == "int2":
result = str(data[0] * 256 + data[1])
elif DhcpFieldsTypes[opt] == "int4":
result = str(ipv4(data).int())
elif DhcpFieldsTypes[opt] == "str":
for each in data:
if each != 0: result += chr(each)
else: break
elif DhcpFieldsTypes[opt] == "ipv4": result = ipv4(data).str()
elif DhcpFieldsTypes[opt] == "hwmac":
result = []
hexsym = [
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b',
'c', 'd', 'e', 'f'
]
for iterator in range(6):
result += [
str(hexsym[data[iterator] / 16] +
hexsym[data[iterator] % 16])
]
result = ':'.join(result)
printable_data += opt + " : " + result + "\n"
# Process options :
printable_data += "# Options fields\n"
for opt in self.options_data.keys():
data = self.options_data[opt]
result = ""
optnum = DhcpOptions[opt]
if opt == 'dhcp_message_type':
result = DhcpFieldsName['dhcp_message_type'][str(data[0])]
elif DhcpOptionsTypes[optnum] == "char":
result = str(data[0])
elif DhcpOptionsTypes[optnum] == "16-bits":
result = str(data[0] * 256 + data[0])
elif DhcpOptionsTypes[optnum] == "32-bits":
result = str(ipv4(data).int())
elif DhcpOptionsTypes[optnum] == "string":
for each in data:
if each != 0: result += chr(each)
else: break
elif DhcpOptionsTypes[optnum] == "ipv4": result = ipv4(data).str()
elif DhcpOptionsTypes[optnum] == "ipv4+":
for i in range(0, len(data), 4):
if len(data[i:i + 4]) == 4:
result += ipv4(data[i:i + 4]).str() + " - "
elif DhcpOptionsTypes[optnum] == "char+":
if optnum == 55: # parameter_request_list
result = ','.join([DhcpOptionsList[each] for each in data])
else:
result += str(data)
printable_data += opt + " : " + result + "\n"
return printable_data
def _decode_32_bits(self, data, data_len):
if len(data) != 4:
return None
val = int(ipv4(data))
return data