Class: Latte::Response::RecordParser

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

Instance Method Summary collapse

Instance Method Details

#encode_name(name) ⇒ Object 



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# File 'lib/latte/response.rb', line 134

def encode_name name
  parts = name.split /\./
  parts.map! { |p| BinData::Uint8.new(p.length).to_binary_s + p }
  parts << BinData::Uint8.new(0).to_binary_s
  parts.join ''
end

#encoded_qclass ⇒ Object 



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# File 'lib/latte/response.rb', line 100

def encoded_qclass
  {
    'IN' => 1,
    'CH' => 3,
    'HS' => 4
  }[qclass]
end

#encoded_qname ⇒ Object 



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# File 'lib/latte/response.rb', line 141

def encoded_qname
  encode_name qname
end

#encoded_qtype ⇒ Object 



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# File 'lib/latte/response.rb', line 112

def encoded_qtype
  {
    'A'     => 1,
    'NS'    => 2,
    'CNAME' => 5,
    'SOA'   => 6,
    'PTR'   => 12,
    'HINFO' => 13,
    'MINFO' => 14,
    'MX'    => 15,
    'TXT'   => 16
  }[qtype]
end

#encoded_rdata ⇒ Object 



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# File 'lib/latte/response.rb', line 145

def encoded_rdata
  # FIXME: Extract this case statment into separate encoders
  case qtype
  when 'A', 'PTR'
    parts = rdata.split /\./
    parts.map! { |o| BinData::Uint8.new(o.to_i).to_binary_s }
    parts.join ''
  when 'NS', 'CNAME'
    encode_name rdata
  else
    raise "I don't know how to encode QTYPE #{qtype.inspect}"
  end
end

#execute ⇒ Object 



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# File 'lib/latte/response.rb', line 167

def execute
  self.record = Answer.new.tap { |a|
    a.qname = encoded_qname
    a.qtype = encoded_qtype
    a.qclass = encoded_qclass
    a.ttl = ttl
    a.rdata = encoded_rdata
  }
end

#parts ⇒ Object 



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# File 'lib/latte/response.rb', line 159

def parts
  string = record_string.dup
  string.strip!
  parts = string.split /\s+/, 5
  parts.map! { |p| p.strip }
  parts
end

#qclass ⇒ Object 



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# File 'lib/latte/response.rb', line 96

def qclass
  parts[1]
end

#qname ⇒ Object

QTYPE codes: A 1 a host address NS 2 an authoritative name server MD 3 a mail destination (Obsolete - use MX) MF 4 a mail forwarder (Obsolete - use MX) CNAME 5 the canonical name for an alias SOA 6 marks the start of a zone of authority MB 7 a mailbox domain name (EXPERIMENTAL) MG 8 a mail group member (EXPERIMENTAL) MR 9 a mail rename domain name (EXPERIMENTAL) NULL 10 a null RR (EXPERIMENTAL) WKS 11 a well known service description PTR 12 a domain name pointer HINFO 13 host information MINFO 14 mailbox or mail list information MX 15 mail exchange TXT 16 text strings



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# File 'lib/latte/response.rb', line 92

def qname
  parts[0]
end

#qtype ⇒ Object 



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# File 'lib/latte/response.rb', line 108

def qtype
  parts[2]
end

#rdata ⇒ Object 



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# File 'lib/latte/response.rb', line 130

def rdata
  parts[4]
end

#ttl ⇒ Object 



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# File 'lib/latte/response.rb', line 126

def ttl
  parts[3].to_i
end