Add a porting pwnlib code to ronin code guide

[postmodern]

Add a porting guide on how to convert pwnlib scripts into ronin ruby scripts. Try to find the ronin equivalents for the various pwnlib APIs. Show examples from ronin-support, ronin-code-asm, ronin-payloads, and ronin-exploits.

• pwnlib.tubes.Buffer -> Ronin::Support::Binary::Buffer
• pwnlib.tubes.process -> IO.popen
• pwnlib.tubes.remote -> tcp_connect, ssl_connect, tls_connect, udp_connect.
• pwnlib.tubes.server -> tcp_server, ssl_server, tls_server, udp_server.
• pwnlib.tubes.ssh -> net-ssh
• pwnlib.useragents -> Ronin::Support::Network::HTTP::UserAgents (also mention ronin-web-user_agents for generating random realistic User-Agent strings).
• pwnlib.timeout -> timeout.
• pwnlib.util.crc -> digest-crc.
• pwnlib.util.fiddling:
  • bits_str -> int.to_s(2)
  • b64d -> string.base64_decode
  • b64e -> string.base64_encode
  • enhex -> string.hex_encode
  • hexdump -> string.hexdump / File.hexdump / io.hexdump
  • hexdump_iter -> Hexdump::Hexdump#each_line?
  • isprint -> string.printable? / Chars::PRINTABLE =~ string
  • js_escape -> string.js_escape
  • js_unescape -> string.js_unescape
  • unhex -> string.hex_decode
  • urldecode -> string.uri_decode/string.uri_unescape`
  • urlencode -> string.uri_encode
  • xor -> string.xor(other_string)
• pwnlib.util.hashes:
  • md5filehex -> File.md5(path)
  • md5sumhex -> string.md5
  • sha1filehex -> File.sha1(path)
  • sha1sumhex -> string.sha1
  • sha256filehex -> File.sha256(path)
  • sha256sumhex -> string.sha256
  • sha512filehex -> File.sha512(path)
  • sha512sumhex -> string.sha512
• pwnlib.util.iters:
  • chained -> return enum_for(__method__,...) unless block_given?
  • consume -> ????
  • cycles -> array.cycle(n)
  • bruteforce -> Chars.alpha_numeric.strings_of_length(n).find { |str| ... }
  • flatten -> array.flatten
  • group -> array.each_slice(n)
  • iter_except -> array.each (this is how enumerators work by default).
  • lookahead -> enum.take(n)
  • nth -> ????
  • pad -> ????
  • pairwise -> enum.each_cons(2)
  • powerset -> require 'combinatorics/power_set' and array.power_set.
  • quantify -> enum.count { |i| ... }
  • random_combination -> array.combination(2).to_a.sample
  • random_permutation -> array.permutation.to_a.sample
  • random_product -> array1.product(array2).sample
  • repeat_func -> Array.new(n) { |i| func(obj) }
  • roundrobbin -> ????
  • tabulate -> (1..4).map { |i| ... } / (1..4).map(&method(:func))
  • take -> enum.take(n)
  • unique_everseen -> enum.uniq
  • unique_justseen -> ????
  • unique_window -> ????
• pwnlib.util.list:
  • concat -> array.concat
  • concat_all -> array.concat
  • findall -> ????
  • group -> each_slice(n)
  • ordlist -> string.bytes
  • partition -> ????
  • unordlist -> array.map(&:chr).join
• pwnlib.util.misc:
  • align -> ???? (maybe array.map with int.round?)
  • align_down -> ???? (maybe array.map with int.round?)
  • binary_ip -> IPAddr.new(ip).hton
  • mkdir_p -> FileUtils.mkdir_p
  • read -> File.binread(path) / File.read(path)
  • size -> ????
  • which -> ????
  • write -> File.binwrite / File.write
• pwnlib.util.packing
  • pack -> int.pack (but with a ctype symbol instead of endianness, wordsize, endianness)
  • p8 -> int.pack(:uint8) / int.chr
  • p16 -> int.pack(:uint16) / int.pack(:uint16_le) / int.pack(:uint16_be)
  • p32 -> int.pack(:uint32) / int.pack(:uint32_le) / int.pack(:uint32_be)
  • p64 -> int.pack(:uint64) / int.pack(:uint64_le) / int.pack(:uint64_be)
  • u8 -> string.unpack1(:uint8)
  • u16 -> string.unpack1(:uint16) / string.unpack1(:uint16_le) / string.unpack1(:uint16_be)
  • u32 -> string.unpack1(:uint32) / string.unpack1(:uint32_le) / string.unpack1(:uint32_be)
  • u64 -> string.unpack1(:uint64) / string.unpack1(:uint64_le) / string.unpack1(:uint64_be)
  • unpack -> string.unpack1 (but with a ctype symbol instead of endianness, wordsize, endianness)
  • unpack_many -> string.unpack (but with a [:uint, n] instead of endianness, wordsize, endianness)