97 lines
2.5 KiB
Ruby
97 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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require_relative 'models/token'
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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 :ack
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attr_reader :peer_token
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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).rjust(2, '0') }.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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def set_peer_token(token)
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SecurityToken.validate(token)
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@peer_token = token
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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 opts [Hash] :chunks, :client and packet header flags for more details check the class +PacketFlags+
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def send_packet(payload, opts = { chunks: 1, client: nil, addr: nil })
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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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ack = @ack
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ip = @ip
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port = @port
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token = @peer_token
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unless opts[:client].nil?
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ack = opts[:client].ack
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ip = opts[:client].addr.ip
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port = opts[:client].addr.port
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token = opts[:client].token
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end
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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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# 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')}#{opts[: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(token)
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data = (header + payload).pack('C*')
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client = opts[:client]
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if @verbose
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if client
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puts "send to #{ip}:#{port} " \
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"client(id=#{client.id} " \
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"token=#{client.token} " \
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"name=#{client.player.name} port=#{client.addr.port})"
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else
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puts "send to #{ip}:#{port}"
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end
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end
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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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