Class: NetBase

Inherits:
Object
  • Object
show all
Defined in:
lib/net_base.rb

Overview

NetBase

Lowest network layer logic. Sends packets via udp. Also adding the teeworlds protocol packet header.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ NetBase

Returns a new instance of NetBase.



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# File 'lib/net_base.rb', line 24

def initialize(opts = {})
  @verbose = opts[:verbose] || false
  @ip = nil
  @port = nil
  @s = nil
  @ack = 0
  @peer_token = [0xFF, 0xFF, 0xFF, 0xFF].map { |b| b.to_s(16).rjust(2, '0') }.join
end

Instance Attribute Details

#ack ⇒ Object

Returns the value of attribute ack.



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# File 'lib/net_base.rb', line 21

def ack
  @ack
end

#peer_token ⇒ Object (readonly)

Returns the value of attribute peer_token.



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# File 'lib/net_base.rb', line 22

def peer_token
  @peer_token
end

Instance Method Details

#bind(socket) ⇒ Object 



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# File 'lib/net_base.rb', line 33

def bind(socket)
  @s = socket
end

#connect(socket, ip, port) ⇒ Object 



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# File 'lib/net_base.rb', line 37

def connect(socket, ip, port)
  @s = socket
  @ip = ip
  @port = port
  @ack = 0
end

#send_packet(payload, opts = { chunks: 1, client: nil, addr: nil }) ⇒ Object

Sends a packing setting the proper header for you

Parameters:

  • payload (Array) —

    The Integer list representing the data after the header

  • opts (Hash) (defaults to: { chunks: 1, client: nil, addr: nil }) —

    :chunks, :client and packet header flags for more details check the class PacketFlags



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# File 'lib/net_base.rb', line 54

def send_packet(payload, opts = { chunks: 1, client: nil, addr: nil })
  # unsigned char flags_ack;    // 6bit flags, 2bit ack
  # unsigned char ack;          // 8bit ack
  # unsigned char numchunks;    // 8bit chunks
  # unsigned char token[4];     // 32bit token
  # // ffffffaa
  # // aaaaaaaa
  # // NNNNNNNN
  # // TTTTTTTT
  # // TTTTTTTT
  # // TTTTTTTT
  # // TTTTTTTT
  if @s.nil?
    puts "Error: no active socket"
    return
  end
  flags_bits = PacketFlags.new(opts).bits
  ack = @ack
  ip = @ip
  port = @port
  token = @peer_token
  unless opts[:client].nil?
    ack = opts[:client].ack
    ip = opts[:client].addr.ip
    port = opts[:client].addr.port
    token = opts[:client].token
  end
  unless opts[:addr].nil?
    ip = opts[:addr].ip
    port = opts[:addr].port
  end
  #          unused flags       ack                             num chunks
  #              ff ffff        aa aaaa aaaa                    NNNN NNNN
  header_bits = "00#{flags_bits}#{ack.to_s(2).rjust(10, '0')}#{opts[:chunks].to_s(2).rjust(8, '0')}"

  header = header_bits.chars.groups_of(8).map do |eight_bits|
    eight_bits.join.to_i(2)
  end

  header += str_bytes(token)
  data = (header + payload).pack('C*')
  client = opts[:client]
  if @verbose
    if client
      puts "send to #{ip}:#{port} " \
           "client(id=#{client.id} " \
           "token=#{client.token} " \
           "name=#{client.player.name} port=#{client.addr.port})"
    else
      puts "send to #{ip}:#{port}"
    end
  end
  @s.send(data, 0, ip, port)

  puts Packet.new(data, '>').to_s if @verbose || opts[:test]
end

#set_peer_token(token) ⇒ Object 



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# File 'lib/net_base.rb', line 44

def set_peer_token(token)
  SecurityToken.validate(token)
  @peer_token = token
end