Class: Metasploit::Aggregator::Tlv::Tlv
- Inherits:
-
Object
- Object
- Metasploit::Aggregator::Tlv::Tlv
- Defined in:
- lib/metasploit/aggregator/tlv/packet.rb
Overview
Base TLV (Type-Length-Value) class
Direct Known Subclasses
Constant Summary collapse
- HEADER_SIZE =
8
Instance Attribute Summary collapse
-
#compress ⇒ Object
Returns the value of attribute compress.
-
#type ⇒ Object
Returns the value of attribute type.
-
#value ⇒ Object
Returns the value of attribute value.
Instance Method Summary collapse
-
#from_r(raw) ⇒ Object
Translates the raw format of the TLV into a sanitize version.
-
#initialize(type, value = nil, compress = false) ⇒ Tlv
constructor
Returns an instance of a TLV.
- #inspect ⇒ Object
-
#meta_type?(meta) ⇒ Boolean
Checks to see if a TLVs meta type is equivalent to the meta type passed.
-
#to_r ⇒ Object
Converts the TLV to raw.
-
#type?(type) ⇒ Boolean
Checks to see if the TLVs type is equivalent to the type passed.
-
#value?(value) ⇒ Boolean
Checks to see if the TLVs value is equivalent to the value passed.
Constructor Details
#initialize(type, value = nil, compress = false) ⇒ Tlv
Returns an instance of a TLV.
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# File 'lib/metasploit/aggregator/tlv/packet.rb', line 171 def initialize(type, value = nil, compress=false) @type = type @compress = compress if (value != nil) if (type & TLV_META_TYPE_STRING == TLV_META_TYPE_STRING) if (value.kind_of?(Integer)) @value = value.to_s else @value = value.dup end else @value = value end end end |
Instance Attribute Details
#compress ⇒ Object
Returns the value of attribute compress.
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# File 'lib/metasploit/aggregator/tlv/packet.rb', line 158 def compress @compress end |
#type ⇒ Object
Returns the value of attribute type.
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# File 'lib/metasploit/aggregator/tlv/packet.rb', line 158 def type @type end |
#value ⇒ Object
Returns the value of attribute value.
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# File 'lib/metasploit/aggregator/tlv/packet.rb', line 158 def value @value end |
Instance Method Details
#from_r(raw) ⇒ Object
Translates the raw format of the TLV into a sanitize version.
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# File 'lib/metasploit/aggregator/tlv/packet.rb', line 301 def from_r(raw) self.value = nil length, self.type = raw.unpack("NN"); # check if the tlv value has been compressed... if( self.type & TLV_META_TYPE_COMPRESSED == TLV_META_TYPE_COMPRESSED ) # set this TLV as using compression @compress = true # remove the TLV_META_TYPE_COMPRESSED flag from the tlv type to restore the # tlv type to its original, allowing for transparent data compression. self.type = self.type ^ TLV_META_TYPE_COMPRESSED # decompress the compressed data (skipping the length and type DWORD's) # disable raw_decompression for now - not needed by aggregator at this time # raw_decompressed = Rex::Text.zlib_inflate( raw[HEADER_SIZE..length-1] ) # # # update the length to reflect the decompressed data length (+HEADER_SIZE for the length and type DWORD's) # length = raw_decompressed.length + HEADER_SIZE # # update the raw buffer with the new length, decompressed data and updated type. # raw = [length, self.type].pack("NN") + raw_decompressed end if (self.type & TLV_META_TYPE_STRING == TLV_META_TYPE_STRING) if (raw.length > 0) self.value = raw[HEADER_SIZE..length-2] else self.value = nil end elsif (self.type & TLV_META_TYPE_UINT == TLV_META_TYPE_UINT) self.value = raw.unpack("NNN")[2] elsif (self.type & TLV_META_TYPE_QWORD == TLV_META_TYPE_QWORD) self.value = raw.unpack("NNQ<")[2] self.value = self.ntohq( self.value ) elsif (self.type & TLV_META_TYPE_BOOL == TLV_META_TYPE_BOOL) self.value = raw.unpack("NNc")[2] if (self.value == 1) self.value = true else self.value = false end else self.value = raw[HEADER_SIZE..length-1] end length end |
#inspect ⇒ Object
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# File 'lib/metasploit/aggregator/tlv/packet.rb', line 188 def inspect utype = type ^ TLV_META_TYPE_COMPRESSED group = false = case (utype & TLV_META_MASK) when TLV_META_TYPE_STRING; "STRING" when TLV_META_TYPE_UINT; "INT" when TLV_META_TYPE_RAW; "RAW" when TLV_META_TYPE_BOOL; "BOOL" when TLV_META_TYPE_QWORD; "QWORD" when TLV_META_TYPE_GROUP; group=true; "GROUP" when TLV_META_TYPE_COMPLEX; "COMPLEX" else; 'unknown-meta-type' end stype = "unknown-#{type}" Metasploit::Aggregator::Tlv.constants.each do |value| next unless Metasploit::Aggregator::Tlv.const_get(value) == type stype = value.to_s break end val = value.inspect if val.length > 50 val = val[0,50] + ' ..."' end group ||= (self.class.to_s =~ /Packet/) if group tlvs_inspect = "tlvs=[\n" @tlvs.each { |t| tlvs_inspect << " #{t.inspect}\n" } tlvs_inspect << "]" else tlvs_inspect = "meta=#{.ljust 10} value=#{val}" end "#<#{self.class} type=#{stype.ljust 15} #{tlvs_inspect}>" end |
#meta_type?(meta) ⇒ Boolean
Checks to see if a TLVs meta type is equivalent to the meta type passed.
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# File 'lib/metasploit/aggregator/tlv/packet.rb', line 233 def () return (self.type & == ) end |
#to_r ⇒ Object
Converts the TLV to raw.
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# File 'lib/metasploit/aggregator/tlv/packet.rb', line 260 def to_r # Forcibly convert to ASCII-8BIT encoding raw = value.to_s.unpack("C*").pack("C*") if (self.type & TLV_META_TYPE_STRING == TLV_META_TYPE_STRING) raw += "\x00" elsif (self.type & TLV_META_TYPE_UINT == TLV_META_TYPE_UINT) raw = [value].pack("N") elsif (self.type & TLV_META_TYPE_QWORD == TLV_META_TYPE_QWORD) raw = [ self.htonq( value.to_i ) ].pack("Q<") elsif (self.type & TLV_META_TYPE_BOOL == TLV_META_TYPE_BOOL) if (value == true) raw = [1].pack("c") else raw = [0].pack("c") end end # check if the tlv is to be compressed... if @compress raw_uncompressed = raw # compress the raw data raw_compressed = Rex::Text.zlib_deflate( raw_uncompressed ) # check we have actually made the raw data smaller... # (small blobs often compress slightly larger then the origional) # if the compressed data is not smaller, we dont use the compressed data if( raw_compressed.length < raw_uncompressed.length ) # if so, set the TLV's type to indicate compression is used self.type = self.type | TLV_META_TYPE_COMPRESSED # update the raw data with the uncompressed data length + compressed data # (we include the uncompressed data length as the C side will need to know this for decompression) raw = [ raw_uncompressed.length ].pack("N") + raw_compressed end end [raw.length + HEADER_SIZE, self.type].pack("NN") + raw end |
#type?(type) ⇒ Boolean
Checks to see if the TLVs type is equivalent to the type passed.
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# File 'lib/metasploit/aggregator/tlv/packet.rb', line 240 def type?(type) return self.type == type end |
#value?(value) ⇒ Boolean
Checks to see if the TLVs value is equivalent to the value passed.
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# File 'lib/metasploit/aggregator/tlv/packet.rb', line 247 def value?(value) return self.value == value end |