mirror of
https://github.com/cyberarm/w3d_hub_linux_launcher.git
synced 2026-03-22 12:16:15 +00:00
71 lines
1.8 KiB
Ruby
71 lines
1.8 KiB
Ruby
require "socket"
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ICMPHeader = Data.define(:type, :code, :checksum, :_ping_id, :_sequence_id, :data)
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ICMP_ECHOREPLY = 0 # Echo reply
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ICMP_ECHO = 8 # Echo request
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ICMP_SUBCODE = 0
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# Perform a checksum on the message. This is the sum of all the short
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# words and it folds the high order bits into the low order bits.
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#
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def checksum(msg)
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length = msg.length
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num_short = length / 2
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check = 0
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msg.unpack("n#{num_short}").each do |short|
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check += short
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end
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if (length % 2).positive?
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check += msg[length-1, 1].unpack1("C") << 8
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end
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check = (check >> 16) + (check & 0xffff)
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~((check >> 16) + check) & 0xffff
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end
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ip_address = "127.0.0.1" # "example.com" # "timecrafters.org" #
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@ping_id = 92_459_064_892 & 0xffff
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@sequence = 1 % 65_536
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data = ""
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data_size = 56
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data_size.times { |n| data << (n % 256).chr }
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check = 0
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packer = "C2 n3 A" << data_size.to_s
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message = [ICMP_ECHO, ICMP_SUBCODE, check, @ping_id, @sequence, data].pack(packer)
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check = checksum(message)
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message = [ICMP_ECHO, ICMP_SUBCODE, check, @ping_id, @sequence, data].pack(packer)
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message_header = ICMPHeader.new(*[ICMP_ECHO, ICMP_SUBCODE, check, @ping_id, @sequence, data])
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socket = Socket.new(Socket::AF_INET, Socket::SOCK_DGRAM, Socket::IPPROTO_ICMP)
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socket.send(message, 0, Socket.pack_sockaddr_in(0, ip_address))
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s = Time.now
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loop do
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data, _addrinfo = socket.recvfrom(1500)
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pp [message, data]
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header = ICMPHeader.new(*data.unpack("C2 n3 A*"))
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pp [message_header, header]
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# reply_type = data[20, 2].unpack1("C2")
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# pp reply_type
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ping_id = header._ping_id
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sequence = header._sequence_id
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case header.type
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when ICMP_ECHOREPLY
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puts "ECHOREPLY"
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end
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pp [@ping_id, ping_id]
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pp [@sequence, sequence]
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if ping_id == @ping_id && sequence == @sequence && reply_type == ICMP_ECHOREPLY
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puts "PING OKAY: #{Time.now - s}s"
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break
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end
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break
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end
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