Class: Net::DNS::RR::SSHFP

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

Overview

NAME

Net::DNS::RR::SSHFP - DNS SSHFP resource record

DESCRIPTION

Class for Delegation signer (SSHFP) resource records.

ACKNOWLEDGEMENT

Jakob Schlyter for code review and supplying patches.

COPYRIGHT

Copyright (c) 2004 RIPE NCC, Olaf Kolkman.

"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, draft-ietf-dnssext-delegation-signer

Constant Summary collapse

HasBabble =

BEGIN { eval { require Digest::BubbleBabble; Digest::BubbleBabble->import(qw(bubblebabble)) };

     $HasBabble = $@ ? 0 : 1;
     
   }
   @TODO Use BubbleBabble!!
false
@@algtype = 
{
   'RSA' => 1,
'DSA' => 2}
@@fingerprinttype = 
{'SHA-1' => 1}
@@fingerprinttypebyval = 
@@fingerprinttype.reverse
@@algtypebyval = 
@@algtype.reverse

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

#algorithm ⇒ Object

Returns the RR's algorithm field in decimal representation

1 = RSA
2 = DSS

print "algoritm" = ", rr.algorithm, "\n"


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# File 'lib/Net/DNS/RR/SSHFP.rb', line 51

def algorithm
  @algorithm
end

#fingerprint ⇒ Object

Returns the value of attribute fingerprint.



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# File 'lib/Net/DNS/RR/SSHFP.rb', line 53

def fingerprint
  @fingerprint
end

#fpbin ⇒ Object

Returns the SHA1 fingerprint over the label and key in hexadecimal representation.

Returns the fingerprint as binary material.



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# File 'lib/Net/DNS/RR/SSHFP.rb', line 60

def fpbin
  @fpbin
end

#fptype ⇒ Object

Returns the fingerprint type of the SSHFP RR.

print "fingerprint type  = " + rr.fptype  + "\n"


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# File 'lib/Net/DNS/RR/SSHFP.rb', line 66

def fptype
  @fptype
end

Instance Method Details

#babble ⇒ Object 



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# File 'lib/Net/DNS/RR/SSHFP.rb', line 175

def babble
  if (HasBabble)
    return bubblebabble(Digest => fpbin())
  else
    return ""
  end
end

#new_from_data(data, offset) ⇒ Object 



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# File 'lib/Net/DNS/RR/SSHFP.rb', line 104

def new_from_data(data, offset)
  if (@rdlength > 0)
    offsettoalg    = offset
    offsettofptype = offset+1
    offsettofp     = offset+2
    fplength       = 20   # This will need to change if other fingerprint types
    # are being deployed.
    
    
    @algorithm = data[oggsettoalg, 1].unpack('C') # , substr($$data, $offsettoalg, 1))
    @fptype    = data[offsettofptype, 1].unpack('C') # , substr($$data, $offsettofptype, 1))
    
    raise NotImplementedError, "This fingerprint type #{@fptype} has not yet been implemented\n." +
			"Contact developer of Net::DNS::RR::SSHFP.\n"  unless fingerprinttypebyval[@fptype] != nil
    
    # All this is SHA-1 dependend
    @fpbin = data[offsettofp, fplength] # SHA1 digest 20 bytes long
    
    @fingerprint = @fpbin.unpack('H*').upcase!  # uc unpack('H*', $self->{:fpbin});
  end
end

#new_from_hash(values) ⇒ Object 



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# File 'lib/Net/DNS/RR/SSHFP.rb', line 140

def new_from_hash(values)
  if values.has_key?(:fingerprint)
    @fingerprint = values[:fingerprint]
  end
  if values.has_key?(:fptype)
    @fptype = values[:fptype]
  end
  if values.has_key?(:fpbin)
    @fpbin = values[:fpbin]
  end
  if values.has_key?(:algorithm)
    @algorithm = values[:algorithm]
  end
end

#new_from_string(instring) ⇒ Object 



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# File 'lib/Net/DNS/RR/SSHFP.rb', line 127

def new_from_string(instring)
  if (string)
    instring = string.tr("()", "") # /()//d
    string.gsub!(/;.*$/, "") # /mg
    string.gsub!(/\n/, "")
    
    @algorithm, @fptype, @fingerprint = string.split(/\s+/, 3)
    
    # We allow spaces in the fingerprint.
    @fingerprint.gsub!(/\s/, "")
  end
end

#rdatastr ⇒ Object 



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# File 'lib/Net/DNS/RR/SSHFP.rb', line 156

def rdatastr
  rdatastr = ''
  
  if (@algorithm!=nil)
    rdatastr = [@algorithm, @fptype, @fingerprint].join('  ') + ' ; ' + babble()
  end
  
  return rdatastr
end

#rr_rdata ⇒ Object 



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

def rr_rdata
  if (@algorithm != nil)
    return [@algorithm, @fptype].pack('C2') + fpbin()
  end
  
  return ''
end