72 lines
1.9 KiB
Ruby
72 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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##
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# NetBase
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#
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# Lowest network layer logic. Sends packets via udp.
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# Also adding the teeworlds protocol packet header.
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class NetBase
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attr_accessor :peer_token, :ack
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def initialize(opts = {})
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@verbose = opts[:verbose] || false
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@ip = nil
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@port = nil
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@s = nil
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@ack = 0
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@peer_token = [0xFF, 0xFF, 0xFF, 0xFF].map { |b| b.to_s(16) }.join
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end
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def bind(socket)
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@s = socket
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end
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def connect(socket, ip, port)
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@s = socket
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@ip = ip
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@port = port
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@ack = 0
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end
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##
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# Sends a packing setting the proper header for you
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#
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# @param payload [Array] The Integer list representing the data after the header
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# @param num_chunks [Integer] Amount of NetChunks in the payload
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# @param flags [Hash] Packet header flags for more details check the class +PacketFlags+
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def send_packet(payload, num_chunks = 1, opts = {})
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# unsigned char flags_ack; // 6bit flags, 2bit ack
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# unsigned char ack; // 8bit ack
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# unsigned char numchunks; // 8bit chunks
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# unsigned char token[4]; // 32bit token
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# // ffffffaa
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# // aaaaaaaa
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# // NNNNNNNN
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# // TTTTTTTT
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# // TTTTTTTT
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# // TTTTTTTT
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# // TTTTTTTT
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flags_bits = PacketFlags.new(opts).bits
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# unused flags ack num chunks
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# ff ffff aa aaaa aaaa NNNN NNNN
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header_bits = "00#{flags_bits}#{@ack.to_s(2).rjust(10, '0')}#{num_chunks.to_s(2).rjust(8, '0')}"
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header = header_bits.chars.groups_of(8).map do |eight_bits|
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eight_bits.join.to_i(2)
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end
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header += str_bytes(@peer_token)
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data = (header + payload).pack('C*')
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ip = @ip
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port = @port
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unless opts[:addr].nil?
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ip = opts[:addr].ip
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port = opts[:addr].port
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end
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puts "send to #{ip}:#{port}"
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@s.send(data, 0, ip, port)
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puts Packet.new(data, '>').to_s if @verbose || opts[:test]
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end
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end
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