gistfile1.rb

#-*- coding:utf-8 -*-
require "net/http"
require "json"
require "nokogiri"

class ODA
  ODA_hdr = {
    "Host" => "www2.onlinedisassembler.com",
    "Content-Type" => "application/x-www-form-urlencoded; charset=UTF-8",
    "Referer" => "http://www2.onlinedisassembler.com/odaweb/",
    "User-Agent" => "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:12.0) Gecko/20100101 Firefox/12.0"
  }
  def initialize
    self.generate_cookie
  end
  def generate_cookie
    Net::HTTP.start(ODA_hdr["Host"]) do |oda|
      oda_res = oda.get("/odaweb/").get_fields("Set-Cookie").join
      oda_cookie = {}
      _,v = oda_res.split(";").first.split("=")
      ENV["ODA_SID"] = v
    end
  end
  
  def generate_payload(d)
    d.map{|k,v| "#{k}=#{v}" }.join("&")
  end
 	
  def disasm(args)
    Net::HTTP.start(ODA_hdr["Host"], 80) do |oda|
      ODA_hdr.merge!({ "Cookie" => "sessionid=#{ENV['ODA_SID']};" })
      oda.post("/odaweb/_set",
        generate_payload({
          :arch => args[:arch],
          :base_address => "0",
          :hex_val => args[:binary].join("+"),
          :endian => args[:endian]
        }),
        ODA_hdr
      )
      oda.post("/odaweb/_refresh", "", ODA_hdr) do |refresh|
        if refresh =~ /503/
          ENV.delete("ODA_SID")
          self.generate_cookie
        else
          puts refresh
        end
      end
    end
  end

  def analyze_disasm_html(json)
    json = JSON.parse(json)["disassembly"]
    html_parser = Nokogiri::HTML.parse(json)
    html_parser.xpath("//tr").each do |disasm|
      addr = disasm.children.children[1].text
      raw = disasm.children.children[2].text
      dis = disasm.children.children[3].text
      puts "#{addr}: #{raw}  #{dis}"
    end
  end
end

# [Rk@23:32:34] ruby oda.rb | tr -d '\n' | ruby oda.rb --in
oda = ODA.new

if ARGV.first == "--in" 
  oda.analyze_disasm_html(STDIN.gets)
else
  binary =  "55 31 D2 89 E5 8B 45 08 56 8B 75 0C 53 8D 58 FF 0F"
  binary +=  "B6 0C 16 88 4C 13 01 83 C2 01 84 C9 75 F1 5B 5E 5D C3"
  binary = binary.split(" ")
  oda.disasm(
    :arch => "armv3",
    :binary => binary,
    :endian => "DEFAULT" #DEFAULT(little-endian), BIG(big-endian), LITTLE(little-endian)
  )
end

gistfile2.txt

r0:desktop ryouma$ ruby oda.rb | tr -d '\n' | ruby oda.rb --in
.data:0x00000000: 3155  adds	r1, #85	; 0x55
.data:0x00000002: 89d2  ldrh	r2, [r2, #14]
.data:0x00000004: 8be5  ldrh	r5, [r4, #30]
.data:0x00000006: 0845  lsrs	r5, r0, #1
.data:0x00000008: 8b56  ldrh	r6, [r2, #26]
.data:0x0000000a: 0c75  lsrs	r5, r6, #17
.data:0x0000000c: 8d53  ldrh	r3, [r2, #42]	; 0x2a
.data:0x0000000e: b60fff58  vmax.u16	d27, d8, d15
.data:0x00000012: 160c  asrs	r4, r1, #24
.data:0x00000014: 4c88  ldr	r4, [pc, #544]	; (0x00000238)
.data:0x00000016: 0113  lsls	r3, r2, #4
.data:0x00000018: c283  stmia	r2!, {r0, r1, r7}
.data:0x0000001a: 8401  strh	r1, [r0, #32]
.data:0x0000001c: 75c9  strb	r1, [r1, #23]
.data:0x0000001e: 5bf1  ldrh	r1, [r6, r7]
.data:0x00000020: 5d5e  ldrb	r6, [r3, r5]
.data:0x00000022: Address 0x0000000000000022 is out of bounds.