89 lines
2.3 KiB
Ruby
89 lines
2.3 KiB
Ruby
require "rex/text"
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module Rex
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module Encoder
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module NDR
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# Provide padding to align the string to the 32bit boundary
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def NDR.align(string)
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return "\x00" * ((4 - (string.length & 3)) & 3)
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end
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# Encode a 4 byte long
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# use to encode:
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# long element_1;
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def NDR.long(string)
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return [string].pack('V')
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end
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# Encode a 2 byte short
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# use to encode:
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# short element_1;
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def NDR.short(string)
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return [string].pack('v')
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end
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# Encode a single byte
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# use to encode:
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# byte element_1;
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def NDR.byte(string)
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return [string].pack('c')
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end
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# Encode a byte array
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# use to encode:
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# char element_1
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def NDR.UniConformantArray(string)
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return long(string.length) + string + align(string)
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end
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# Encode a string
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# use to encode:
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# char *element_1;
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def NDR.string(string)
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string += "\x00" # null pad
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return long(string.length) + long(0) + long(string.length) + string + align(string)
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end
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# Encode a string
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# use to encode:
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# w_char *element_1;
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def NDR.wstring(string)
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string += "\x00" # null pad
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return long(string.length) + long(0) + long(string.length) + Rex::Text.to_unicode(string) + align(Rex::Text.to_unicode(string))
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end
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# Encode a string and make it unique
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# use to encode:
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# [unique] w_char *element_1;
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def NDR.uwstring(string)
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string += "\x00" # null pad
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return long(rand(0xffffffff))+long(string.length) + long(0) + long(string.length) + Rex::Text.to_unicode(string) + align(Rex::Text.to_unicode(string))
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end
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# Encode a string that is already unicode encoded
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# use to encode:
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# w_char *element_1;
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def NDR.wstring_prebuilt(string)
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# if the string len is odd, thats bad!
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if string.length % 2 > 0
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string += "\x00"
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end
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len = string.length / 2;
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return long(len) + long(0) + long(len) + string + align(string)
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end
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# alias to wstring, going away soon
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def NDR.UnicodeConformantVaryingString(string)
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NDR.wstring(string)
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end
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# alias to wstring_prebuilt, going away soon
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def NDR.UnicodeConformantVaryingStringPreBuilt(string)
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NDR.wstring_prebuilt(string)
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end
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end
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end
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end
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