/
shared.rb
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/
shared.rb
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#
# shared.rb
#
# Author:
# Ashley Towns <ashleyis@me.com>
#
# Copyright (c) 2010 Ashley Towns
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
require 'packetfu'
require 'bindata'
require 'socket'
DHCPPacketOP = 0x01
DHCPHtype = 0x01
DHCPHeaderLength = 0x06
DHCPHops = 0x0
DHCPMagicCookie = 0x63825363
DHCPOptionsEnd = 0xFF
DHCPPacketXID = 0x34334390
# Based off http://en.wikipedia.org/wiki/DHCP
class DHCPPacket < BinData::Record
endian :big
bit8 :op
bit8 :htype
bit8 :hlen
bit8 :hops
bit32 :xid
bit16 :secs
bit16 :flags
array :ciaddr, :type => :bit8, :initial_length => 4
array :yiaddr, :type => :bit8, :initial_length => 4
array :siaddr, :type => :bit8, :initial_length => 4
array :giaddr, :type => :bit8, :initial_length => 4
array :chaddr, :type => :bit8, :initial_length => 16
string :sname, :length => 64
string :file, :length => 128
bit32 :isdhcp, :value => DHCPMagicCookie
array :dhcpoptions, :type => :bit8, :endian => :big # Should maybe add a limit.
end
DHCPOP_MESSAGETYPES = {
# DHCP Message type responses (all len = 1)
:DHCPMessageTypeDiscover => 1,
:DHCPMessageTypeOffer => 2,
:DHCPMessageTypeRequest => 3,
:DHCPMessageTypeDecline => 4,
:DHCPMessageTypeAck => 5,
:DHCPMessageTypeNak => 6,
:DHCPMessageTypeRelease => 7,
}
DHCPOP_CONSTANTS = {
# DHCP Options
:DHCPPad => 0,
:DHCPSubnetMask => 1,
:DHCPTimeOffset => 2,
:DHCPRouter => 3,
:DHCPTimeServer => 4,
:DHCPNameServer => 5,
:DHCPDNS => 6,
:DHCPLogServer => 7,
:DHCPQuoteServer => 8,
:DHCPLPRServer => 9,
:DHCPImpressServer => 10,
:DHCPRLServer => 11,
:DHCPHostName => 12,
:DHCPBootFileSize => 13,
:DHCPMeritDumpFile => 14,
:DHCPDomainName => 15,
:DHCPSwapServer => 16,
:DHCPRootPath => 17,
:DHCPExtensionsPath => 18,
:DHCPIPForwarding => 19,
:DHCPNonLocalRouting => 20,
:DHCPPolicyFilter => 21,
:DHCPMaximumDRSize => 22, # Datagram reassembly size
:DHCPDefaultIPTTL => 23,
:DHCPPathMTUAgingTimeout => 24,
:DHCPPathMTUPlateauTable => 25,
:DHCPInterfaceMTU => 26,
:DHCPAllSubnetsLocal => 27,
:DHCPBroadcastAddress => 28,
:DHCPPerformMask => 29, # Perform mask discovery
:DHCPMaskSupplier => 30, # Zelda flashbacks
:DHCPPerformRouter => 31, # Perform router discovery
:DHCPRouterSolicitation => 32, # Router Solicitation Address
:DHCPStaticRoutingEnable => 33,
:DHCPTrailerEncap => 34, # Trailer Encapsulation
:DHCPArpCacheTimeout => 35,
:DHCPEthernetEncap => 36, # ethernet encapsulation
:DHCPDefaultTCPTTL => 37,
:DHCPTCPKeepAliveInt => 38, # TCP Keepalive interval
:DHCPTCPKeepAliveGB => 39, # TCP Keepalive garbage
:DHCPNISDomain => 40,
:DHCPNISServer => 41,
:DHCPNTPServers => 42,
:DHCPVendorSpecificInfo => 43,
:DHCPNetBIOSNameServer => 44,
:DHCPNetBIOSDDS => 45,
:DHCPNetBIOSNodeType => 46,
:DHCPNetBIOSScope => 47,
:DHCPXWindowSystemFont => 48, # XWindow Font server
:DHCPXWindowSystemDM => 49, # Xwindow System Display Server
:DHCPRequestedIPAddress => 50,
:DHCPIPAddressLeaseTime => 51,
:DHCPOptionOverload => 52,
:DHCPMessageType => 53,
:DHCPServerIdentifier => 54,
:DHCPParameters => 55,
:DHCPMessage => 56,
:DHCPMaxDHCPMessageSize => 57,
:DHCPRenewTimeValue => 58,
:DHCPRebindingTimeValue => 59,
:DHCPClassIdentifier => 60,
:DHCPClientIdentifier => 61,
:DHCPNetWareIPDomainName => 62,
:DHCPNetWareIPInformation => 63,
:DHCPNISDomain => 64,
:DHCPNISServers => 65,
:DHCPTFTPServerName => 66,
:DHCPBootFileName => 67,
:DHCPMobileIPHomeAgent => 68,
:DHCPSMTPServer => 69,
:DHCPPOPServer => 70,
:DHCPNNTPServer => 71,
:DHCPDefaultWWWServer => 72,
:DHCPDefaultFingerServer => 73,
:DHCPDefaultIRCServer => 74,
:DHCPStreetTalkServer => 75,
:DHCPStreetTalkDAS => 76,
:DHCPUserClassInformation => 77,
:DHCPSLPDirectoryAgent => 78,
:DHCPSLPServiceScope => 79,
:DHCPRapidCommit => 80,
:DHCPFQDN => 81,
:DHCPRelayAgentInformation => 82,
:DHCPInternetStorageNameService => 83,
# ??
:DHCPNDSServers => 85,
:DHCPNDSTreeName => 86,
:DHCPNDSContext => 87,
:DHCPBCMCSContDomainNameList => 88,
:DHCPBCMCSContIPV4AddressList => 89,
:DHCPAuthentication => 90,
:DHCPClientLastTransactTime => 91,
:DHCPAssociatedIP => 92,
:DHCPClientSystemArchType => 93,
:DHCPClientNetworkInterfaceIdent => 94,
:DHCPLDAP => 95,
# ??
:DHCPClientMachineIdent => 97,
:DHCPOGUA => 98,
# ??
:DHCPAutonomousSystemNumber => 109,
# ??
:DHCPNetInfoParentServerAddress => 112,
:DHCPNetInfoParentServerTag => 113,
:DHCPURL => 114,
:DHCPAutoConfigure => 116,
:DHCPNameServiceSearch => 117,
:DHCPSubnetSelection => 118,
:DHCPDNSDomainSearchList => 119,
:DHCPSIPServers => 120,
:DHCPClasslessStaticRoute => 121,
:DHCPCableLabsClientConfig => 122,
:DHCPGeoConf => 123,
# ??
:DHCPProxyAutoDiscovery => 252
}
# Ugh really fucking hacky
def get_macaddr
currentEth = currentAddr = nil; macaddrs = {}
`ifconfig`.split("\n").map! do |line|
maybeEth = line.match(/([a-z]+[0-9]+): .*/)
currentEth = maybeEth[1].strip if !maybeEth.nil?
maybeAddr = line.match(/ether ([0-9 A-Ea-e \:]+)/)
currentAddr = maybeAddr[1].strip if !maybeAddr.nil?
if currentEth != nil && currentAddr != nil
macaddrs[currentEth] = currentAddr
currentEth = currentAddr = nil
end
end
macaddrs
end
def to_primative_ip(ip)
ip.split(/\./).collect { |int| int.to_i }
end
def to_primative_mac_p(mac)
padding = ':00:00:00:00:00:00:00:00:00:00'
mac += padding
to_primative_mac(mac)
end
def to_primative_mac(mac)
mac.split(/[:\x2d\x2e\x20\x5f]+/).collect {|x| x.to_i(16)}
end
def str2hex(str)
hexed = []
str.each_char {|char| hexed << char.unpack('U').first }
hexed
end
def hex2dec hex
hexref = "0x"
hex.each_byte {|x| hexref += x.to_s 16}
eval hexref # Baha!
end
def hex2ary hex
ary = []
hex.each_byte {|x| ary << x }
ary
end
def hex2mac hex
mac = ""
hex.each_byte {|x| mac += ":#{x.to_s(16)}" if x != 0 }
mac[1..mac.length-1]
end
def hex2ip hex
ip = ""
hex.each_byte {|x| ip += ".#{x.to_i}"}
ip[1..ip.length-1]
end
def hex2ipstr hex
hex.map{|x| x.unpack('C').first }.join('.')
end
# Build an options packet in sta-eyell
def build_options_pack (*options)
getr = lambda{|value| value = DHCPOP_CONSTANTS[value].nil? ? value : DHCPOP_CONSTANTS[value]; DHCPOP_MESSAGETYPES[value].nil? ? value : DHCPOP_MESSAGETYPES[value] }
# Build the tree
packets = options.map do |x|
packet = []
if x.class == Array
x.each {|y| (y.class == Array ? y.each{|z| packet << getr.call(z)} : packet << getr.call(y))}
else; raise "Packet option should be an array."; end
packet
end
# Work out the lengths, out = length-(op+1)
ret = []
packets.each {|packet| packet.each {|obj| ret << (obj == :len ? packet.length-2 : obj)}}
ret
end
def op2co op
DHCPOP_CONSTANTS.each {|x,y| return x if y == op }
raise "Fatal: OP Error #{op} is not known."
return op.chr
end
def hex2dhcpops hex
getr = lambda{|value| DHCPOP_CONSTANTS[value].nil? ? value : DHCPOP_CONSTANTS[value]}
options = []
sgrab = hex[2]
i = 2
while i < hex.length
opcode = hex[i-2]
length = hex[i-1]
opts = hex[i..length+i-1]
options << [opcode, opts]
i = i+length+2
end
options.map! do |x|
x.map! do |y|
if y.class == Array
if x[0] == :DHCPMessageType
DHCPOP_MESSAGETYPES.detect {|na,va| va == y.first }[0]
elsif x[0] == :DHCPParameters
y.map!{|z| op2co(z)}
else
y.map!{|z| z.chr }
end
else
break if y == 255 # end
op2co(y)
end
end
end
ret = {}
options.each do |option|
next if option == nil
next if option == :DHCPPad
ret[option.first] = option[1..option.length].first
end
ret
end
def decompile_packet packet
current_packet = DHCPPacket.new
# DHCP Packet decompile
current_packet.op = hex2dec(packet[0]) # 8bit
current_packet.htype = hex2dec(packet[1]) # 8bit
current_packet.hlen = hex2dec(packet[2]) # 8bit
current_packet.hops = hex2dec(packet[3]) # 8bit
current_packet.xid = hex2dec(packet[4..7]) # 32bit
current_packet.secs = hex2dec(packet[8..9]) # 16bit
current_packet.flags = hex2dec(packet[10..11]) # 16bit
current_packet.ciaddr = hex2ary(packet[12..15]) # 32bit (ary)
current_packet.yiaddr = hex2ary(packet[16..19]) # 32bit (ary)
current_packet.siaddr = hex2ary(packet[20..23]) # 32bit (ary)
current_packet.giaddr = hex2ary(packet[24..27]) # 32bit (ary)
current_packet.chaddr = hex2ary(packet[28..43]) # 128bit (ary)
current_packet.sname = packet[44..107] # 64bit (str)
current_packet.file = packet[108..235] # 128bit (str)
magic_cookie = hex2dec(packet[236..239]) # COOKIEZ OMNOMNOM (32bit)
current_packet.dhcpoptions = hex2ary(packet[240..packet.length]) # DHCP Options (rest)
return nil if magic_cookie != DHCPMagicCookie
return current_packet
end
def send_packet(options = {})
# Sane defaults
src_p = options[:sport].nil? ? 68 : options[:sport]
dst_p = options[:dport].nil? ? 67 : options[:dport]
src_a = options[:saddr].nil? ? '0.0.0.0' : options[:saddr]
dst_a = options[:daddr].nil? ? '255.255.255.255' : options[:daddr]
ethsrc = options[:ethsrc].nil? ? 'ff:ff:ff:ff:ff:ff' : options[:ethsrc]
ethdst = options[:ethdst].nil? ? 'ff:ff:ff:ff:ff:ff' : options[:ethdst]
op = options[:op].nil? ? DHCPPacketOP : options[:op]
htype = options[:htype].nil? ? DHCPHtype : options[:htype]
hlen = options[:hlen].nil? ? DHCPHeaderLength : options[:hlen]
hops = options[:hops].nil? ? DHCPHops : options[:hops]
xid = options[:xid].nil? ? DHCPPacketXID : options[:xid]
ciaddr = options[:ciaddr].nil? ? '0.0.0.0' : options[:ciaddr]
yiaddr = options[:yiaddr].nil? ? '0.0.0.0' : options[:yiaddr]
siaddr = options[:siaddr].nil? ? '0.0.0.0' : options[:siaddr]
giaddr = options[:giaddr].nil? ? '0.0.0.0' : options[:giaddr]
chaddr = options[:chaddr].nil? ? "ff:ff:ff:ff:ff:ff" : options[:chaddr]
sname = options[:sname].nil? ? "" : options[:sname]
file = options[:file].nil? ? "" : options[:file]
dhcpoptions = options[:dhcpoptions].nil? ? [nil] : options[:dhcpoptions]
# Build the dhcp packet
dhcppacket = DHCPPacket.new
dhcppacket.op = op
dhcppacket.htype = htype
dhcppacket.hlen = hlen
dhcppacket.hops = hops
dhcppacket.xid = xid
dhcppacket.ciaddr = (ciaddr.class == Array ? ciaddr : to_primative_ip(ciaddr))
dhcppacket.yiaddr = (yiaddr.class == Array ? yiaddr : to_primative_ip(yiaddr))
dhcppacket.siaddr = (siaddr.class == Array ? siaddr : to_primative_ip(siaddr))
dhcppacket.giaddr = (giaddr.class == Array ? giaddr : to_primative_ip(giaddr))
dhcppacket.chaddr = (chaddr.class == BinData::Array ? chaddr : to_primative_mac_p(chaddr))
dhcppacket.sname = sname
dhcppacket.file = file
dhcppacket.dhcpoptions = dhcpoptions
# Build the UDP packet
udppacket = PacketFu::UDPPacket.new
udppacket.udp_src = src_p
udppacket.udp_dst = dst_p
udppacket.ip_saddr = src_a
udppacket.ip_daddr = dst_a
udppacket.payload = dhcppacket.to_binary_s
udppacket.eth_header.eth_saddr = ethsrc
udppacket.eth_header.eth_daddr = ethdst
udppacket.recalc
puts "src: #{src_p} dst: #{dst_p} src_a: #{src_a} dst_a: #{dst_a} eth_src: #{ethsrc} eth_dst: #{ethdst}"
udppacket.to_w('en1')
end