78 lines
2.3 KiB
Ruby
78 lines
2.3 KiB
Ruby
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# This file is part of Metasm, the Ruby assembly manipulation suite
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# Copyright (C) 2006-2009 Yoann GUILLOT
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#
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# Licence is LGPL, see LICENCE in the top-level directory
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#
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# this exemple illustrates the use of the cparser/preprocessor #factorize functionnality:
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# it generates code that references to the functions imported by an ELF executable
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# usage: factorize-imports.rb <exe> [<path to include dir>] [<additional func names>... !<func to exclude>]
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#
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require 'metasm'
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include Metasm
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require 'optparse'
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opts = { :hdrs => [], :defs => {}, :path => [] }
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OptionParser.new { |opt|
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opt.on('-o outfile') { |f| opts[:outfile] = f }
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opt.on('-H additional_header') { |f| opts[:hdrs] << f }
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opt.on('--exe executable') { |f| opts[:exe] = f }
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opt.on('-I path', '--includepath path') { |f| opts[:path] << f }
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opt.on('-D var') { |f| k, v = f.split('=', 2) ; opts[:defs].update k => (v || '') }
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opt.on('--gcc') { opts[:gcc] = true }
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opt.on('--vs', '--visualstudio') { opts[:vs] = true }
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}.parse!(ARGV)
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exe = AutoExe.decode_file_header(opts[:exe] || ARGV.shift)
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opts[:path] ||= [ARGV.shift] if not ARGV.empty?
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case exe
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when PE
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exe.decode_imports
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funcnames = exe.imports.map { |id| id.imports.map { |i| i.name } }
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when ELF
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exe.decode_segments_dynamic
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funcnames = exe.symbols.map { |s| s.name if s.shndx == 'UNDEF' and s.type == 'FUNC' }
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opts[:hdrs] << 'stdio.h' << 'stdlib.h' << 'unistd.h'
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opts[:gcc] = true if not opts[:vs]
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else raise "unsupported #{exe.class}"
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end
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funcnames = funcnames.flatten.compact.uniq.sort
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ARGV.each { |n|
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if n[0] == ?!
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funcnames.delete n[1..-1]
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else
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funcnames |= [n]
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end
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}
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src = opts[:hdrs].map { |h| "#include <#{h}>" }.join("\n")
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parser = Ia32.new.new_cparser
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parser.prepare_gcc if opts[:gcc]
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parser.prepare_visualstudio if opts[:vs]
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pp = parser.lexer
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pp.warn_redefinition = false
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pp.include_search_path[0, 0] = opts[:path]
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opts[:defs].each { |k, v| pp.define k, v }
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parser.factorize_init
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parser.parse src
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# delete imports not present in the header files
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funcnames.delete_if { |f|
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if not parser.toplevel.symbol[f]
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puts "// #{f.inspect} is not defined in the headers"
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true
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end
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}
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parser.parse "void *fnptr[] = { #{funcnames.map { |f| '&'+f }.join(', ')} };"
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outfd = (opts[:outfile] ? File.open(opts[:outfile], 'w') : $stdout)
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outfd.puts parser.factorize_final
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outfd.close
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