Class: Net::DNS::RR::NSAP

Inherits:
Net::DNS::RR show all
Defined in:
lib/Net/DNS/RR/NSAP.rb

Overview

NAME

Net::DNS::RR::NSAP - DNS NSAP resource record

DESCRIPTION

Class for DNS Network Service Access Point (NSAP) resource records.

COPYRIGHT

Copyright © 1997-2002 Michael Fuhr.

Portions Copyright © 2002-2004 Chris Reinhardt.

Ruby version Copyright © 2006 AlexD (Nominet UK)

All rights reserved. This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself..

SEE ALSO

Net::DNS, Net::DNS::Resolver, Net::DNS::Packet, Net::DNS::Header, Net::DNS::Question, Net::DNS::RR, RFC 1706.

Constant Summary

Constants inherited from Net::DNS::RR

RRS

Instance Attribute Summary collapse

Attributes inherited from Net::DNS::RR

#name, #rdata, #rdlength, #rrclass, #ttl, #type

Instance Method Summary collapse

Methods inherited from Net::DNS::RR

#_canonicalRdata, #_canonicaldata, _get_subclass, _name2wire, #_name2wire, build_regex, create, #create_rrsort_func, #data, #get_rrsort_func, #init, #init_rrsort_func, #inspect, new_from_data, new_from_hash, new_from_string, #set_rrsort_func

Instance Attribute Details

#aa ⇒ Object

Returns the RR’s administrative authority.

print "aa = ", rr.aa, "\n"



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# File 'lib/Net/DNS/RR/NSAP.rb', line 64

def aa
  @aa
end

#afi ⇒ Object

Returns the RR’s authority and format identifier. Net::DNS currently supports only AFI 47 (GOSIP Version 2).

print "afi = ", rr.afi, "\n"



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# File 'lib/Net/DNS/RR/NSAP.rb', line 49

def afi
  @afi
end

#area ⇒ Object

Returns the RR’s area identifier.

print "area = ", rr.area, "\n"



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# File 'lib/Net/DNS/RR/NSAP.rb', line 74

def area
  @area
end

#dfi ⇒ Object

Returns the RR’s DSP format identifier.

print "dfi = ", rr.dfi, "\n"



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# File 'lib/Net/DNS/RR/NSAP.rb', line 59

def dfi
  @dfi
end

#id ⇒ Object

Returns the RR’s system identifier.

print "id = ", rr.id, "\n"



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# File 'lib/Net/DNS/RR/NSAP.rb', line 79

def id
  @id
end

#idi ⇒ Object

Returns the RR’s initial domain identifier.

print "idi = ", rr.idi, "\n"



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# File 'lib/Net/DNS/RR/NSAP.rb', line 54

def idi
  @idi
end

#rd ⇒ Object

Returns the RR’s routing domain identifier.

print "rd = ", rr.rd, "\n"



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# File 'lib/Net/DNS/RR/NSAP.rb', line 69

def rd
  @rd
end

#rsvd ⇒ Object 



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# File 'lib/Net/DNS/RR/NSAP.rb', line 197

def rsvd
  if (@rsvd==nil)
    return "0000"
  else
    return @rsvd
  end
end

#sel ⇒ Object

Returns the RR’s NSAP selector.

print "sel = ", rr.sel, "\n"



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# File 'lib/Net/DNS/RR/NSAP.rb', line 84

def sel
  @sel
end

Instance Method Details

#dsp ⇒ Object

Returns the RR’s domain specific part (the DFI, AA, Rsvd, RD, Area, ID, and SEL fields).

print "dsp = ", rr.dsp, "\n"



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# File 'lib/Net/DNS/RR/NSAP.rb', line 192

def dsp
  ret = [@dfi,@aa,rsvd,@rd,@area,@id,@sel].join('')
  return ret
end

#idp ⇒ Object

Returns the RR’s initial domain part (the AFI and IDI fields).

print "idp = ", rr.idp, "\n"



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# File 'lib/Net/DNS/RR/NSAP.rb', line 182

def idp
  ret = [@afi, @idi].join('')
  return ret
end

#new_from_data(data, offset) ⇒ Object 



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# File 'lib/Net/DNS/RR/NSAP.rb', line 90

def new_from_data(data, offset)
  if (@rdlength > 0)
    afi = data.unpack("\@#{offset} C")[0];
    @afi = sprintf("%02x", afi);
    offset+=1;
    
    if (@afi == "47")
      idi = data.unpack("\@#{offset} C2");
      offset += 2;
      
      dfi = data.unpack("\@#{offset} C")[0];
      offset += 1;
      
      aa = data.unpack("\@#{offset} C3");
      offset += 3;
      
      rsvd = data.unpack("\@#{offset} C2");
      offset += 2;
      
      rd = data.unpack("\@#{offset} C2");
      offset += 2;
      
      area = data.unpack("\@#{offset} C2");
      offset += 2;
      
      id = data.unpack("\@#{offset} C6");
      offset += 6;
      
      sel = data.unpack("\@#{offset} C")[0];
      offset += 1;
      
      @idi  = sprintf("%02x%02x", idi[0], idi[1]);
      @dfi  = sprintf("%02x", dfi);
      @aa   = sprintf("%02x%02x%02x", aa[0], aa[1], aa[2]);
      @rsvd = sprintf("%02x%02x", rsvd[0],rsvd[1]);
      @rd   = sprintf("%02x%02x", rd[0],rd[1]);
      @area = sprintf("%02x%02x", area[0],area[1]);
      @id   = sprintf("%02x%02x%02x%02x%02x%02x", id[0],id[1],id[2],id[3],id[4],id[5]);
      @sel  = sprintf("%02x", sel);
      
    else
      # What to do for unsupported versions?
    end
  end
end

#new_from_hash(values) ⇒ Object 



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# File 'lib/Net/DNS/RR/NSAP.rb', line 136

def new_from_hash(values)
  if values.has_key?(:idi)
    @idi = values[:idi]
  end
  if values.has_key?(:dfi)
    @dfi = values[:dfi]
  end
  if values.has_key?(:afi)
    @afi = values[:afi]
  end
  if values.has_key?(:aa)
    @aa = values[:aa]
  end
  if values.has_key?(:sel)
    @sel = values[:sel]
  end
  if values.has_key?(:id)
    @id = values[:id]
  end
  if values.has_key?(:rsvd)
    @rsvd = values[:rsvd]
  end
  if values.has_key?(:rd)
    @rd = values[:rd]
  end
  if values.has_key?(:area)
    @area = values[:area]
  end
end

#new_from_string(s) ⇒ Object 



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# File 'lib/Net/DNS/RR/NSAP.rb', line 166

def new_from_string(s)
  if (s)
    string = s.gsub(/\./, "");  # remove all dots.
    string.gsub!(/^0x/,"");  # remove leading 0x
    
    if (string =~ /^[a-zA-Z0-9]{40}$/)
     (@afi, @idi, @dfi, @aa, @rsvd, @rd, @area, @id, @sel) = string.unpack("A2A4A2A6A4A4A4A12A2")
    end
  end
end

#rdatastr ⇒ Object 



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# File 'lib/Net/DNS/RR/NSAP.rb', line 205

def rdatastr
  rdatastr=""
  
  if (defined?@afi)
    if (@afi == "47")
      rdatastr = [idp, dsp].join('')
    else
      rdatastr = "; AFI #{@afi} not supported"
    end
  else
    rdatastr = ''
  end
  
  return rdatastr
end

#rr_rdata(*args) ⇒ Object 



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# File 'lib/Net/DNS/RR/NSAP.rb', line 221

def rr_rdata(*args)
  rdata = ""
  
  if (defined?@afi)
    #            rdata += [@afi.to_i().to_s(16).to_i()].pack("C");
    rdata += [@afi.to_i(16)].pack("C")
    
    if (@afi == "47")
      rdata += str2bcd(@idi,  2)
      rdata += str2bcd(@dfi,  1)
      rdata += str2bcd(@aa,   3)
      rdata += str2bcd(0,               2)	# rsvd
      rdata += str2bcd(@rd,   2)
      rdata += str2bcd(@area, 2)
      rdata += str2bcd(@id,   6)
      rdata += str2bcd(@sel,  1)
    end            
    # Checks for other versions would go here.
  end
  
  return rdata
end

#str2bcd(s, bytes) ⇒ Object

This can’t be the best way.…



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# File 'lib/Net/DNS/RR/NSAP.rb', line 253

def str2bcd(s, bytes)
  retval = "";
  
  digits = bytes * 2;
  string = sprintf("%#{digits}s", s);
  string.tr!(" ","0");
  
  i=0;
  bytes.times do
    bcd = string[i*2, 2];
    retval += [bcd.to_i(16)].pack("C");
    i+=1
  end
  
  return retval;
end