Class: Net::SNMP::PDU

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Debug
Defined in:
lib/net/snmp/pdu.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Debug

#debug, debug=

Constructor Details

#initialize(pdu_type) ⇒ PDU

Create a new PDU object. pdu_type The type of the PDU. For example, Net::SNMP::SNMP_MSG_GET. See constants.rb



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# File 'lib/net/snmp/pdu.rb', line 17

def initialize(pdu_type)
  @varbinds = []
  case pdu_type
  when FFI::Pointer
    @struct = Wrapper::SnmpPdu.new(pdu_type)
    @command = @struct.command
    v = @struct[:variables]
    if v
      @varbinds << Varbind.from_pointer(v)
    end

    while( !(v = Wrapper::VariableList.new(v).next_variable).null? )
      @varbinds << Varbind.from_pointer(v)
    end
  when Fixnum
    @struct = Wrapper.snmp_pdu_create(pdu_type)
    @command = pdu_type
  else
    raise Error.new, "invalid pdu type"
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(m, *args) ⇒ Object 



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# File 'lib/net/snmp/pdu.rb', line 71

def method_missing(m, *args)
  if @struct.respond_to?(m)
    @struct.send(m, *args)
  else
    super
  end
end

Instance Attribute Details

#callback ⇒ Object

Returns the value of attribute callback.



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# File 'lib/net/snmp/pdu.rb', line 12

def callback
  @callback
end

#command ⇒ Object

Returns the value of attribute command.



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# File 'lib/net/snmp/pdu.rb', line 12

def command
  @command
end

#struct ⇒ Object

Returns the value of attribute struct.



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# File 'lib/net/snmp/pdu.rb', line 12

def struct
  @struct
end

#varbinds ⇒ Object

Returns the value of attribute varbinds.



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# File 'lib/net/snmp/pdu.rb', line 12

def varbinds
  @varbinds
end

Instance Method Details

#add_varbind(options) ⇒ Object

Adds a variable binding to the pdu. Options:

  • oid The SNMP OID

  • type The data type. Possible values include Net::SNMP::ASN_OCTET_STR, Net::SNMP::ASN_COUNTER, etc. See constants.rb

  • value The value of the varbind. default is nil.



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# File 'lib/net/snmp/pdu.rb', line 84

def add_varbind(options)
  #puts "adding varbind #{options.inspect}"
  options[:type] ||= case options[:value]
    when String
      Constants::ASN_OCTET_STR
    when Fixnum
      Constants::ASN_INTEGER
    when Net::SNMP::OID
      Constants::ASN_OBJECT_ID
    when nil
      Constants::ASN_NULL
    else
      raise "Unknown value type"
  end

  value = options[:value]
  value_len = case options[:type]
    when Constants::ASN_NULL
      0
    else
      options[:value].size
  end

  value = case options[:type]
    when Constants::ASN_INTEGER, Constants::ASN_GAUGE, Constants::ASN_COUNTER, Constants::ASN_TIMETICKS, Constants::ASN_UNSIGNED
      new_val = FFI::MemoryPointer.new(:long)
      new_val.write_long(value)
      new_val
    when Constants::ASN_OCTET_STR, Constants::ASN_BIT_STR, Constants::ASN_OPAQUE
      value
    when Constants::ASN_IPADDRESS
      # TODO
    when Constants::ASN_OBJECT_ID
      value.pointer
    when Constants::ASN_NULL
      nil
    else
      if value.respond_to?(:pointer)
        value.pointer
      else
        raise Net::SNMP::Error.new, "Unknown variable type #{options[:type]}"
      end
  end

  oid = options[:oid].kind_of?(Net::SNMP::OID) ? options[:oid] : Net::SNMP::OID.new(options[:oid])
  var_ptr = Wrapper.snmp_pdu_add_variable(@struct.pointer, oid.pointer, oid.length_pointer.read_int, options[:type], value, value_len)
  varbind = Varbind.new(var_ptr)
  #Wrapper.print_varbind(varbind.struct)
  varbinds << varbind
end

#agent_addr ⇒ Object 



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# File 'lib/net/snmp/pdu.rb', line 66

def agent_addr
  @agent_addr
end

#agent_addr=(addr) ⇒ Object 



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# File 'lib/net/snmp/pdu.rb', line 61

def agent_addr=(addr)
  @struct.agent_addr = addr.split('.').pack("CCCC")
  @agent_addr = addr
end

#enterprise ⇒ Object 



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# File 'lib/net/snmp/pdu.rb', line 57

def enterprise
  @enterprise
end

#enterprise=(e_oid) ⇒ Object 



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# File 'lib/net/snmp/pdu.rb', line 52

def enterprise=(e_oid)
  @enterprise = e_oid
  @struct.enterprise = e_oid.pointer
  @struct.enterprise_length = e_oid.size
end

#error? ⇒ Boolean

Returns true if pdu is in error

Returns:

  • (Boolean) 


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# File 'lib/net/snmp/pdu.rb', line 136

def error?
  self.errstat != 0
end

#error_message ⇒ Object

A descriptive error message



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# File 'lib/net/snmp/pdu.rb', line 141

def error_message
  Wrapper::snmp_errstring(self.errstat)
end

#free ⇒ Object

Free the pdu



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# File 'lib/net/snmp/pdu.rb', line 146

def free
  Wrapper.snmp_free_pdu(@struct.pointer)
end

#max_repetitions ⇒ Object 



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# File 'lib/net/snmp/pdu.rb', line 49

def max_repetitions
  @struct.errindex
end

#max_repetitions=(mr) ⇒ Object 



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# File 'lib/net/snmp/pdu.rb', line 46

def max_repetitions=(mr)
  @struct.errindex = mr
end

#non_repeaters ⇒ Object 



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# File 'lib/net/snmp/pdu.rb', line 43

def non_repeaters
  @struct.errstat
end

#non_repeaters=(nr) ⇒ Object

For getbulk requests, repeaters and maxreps are stored in errstat and errindex



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# File 'lib/net/snmp/pdu.rb', line 40

def non_repeaters=(nr)
  @struct.errstat = nr
end

#print ⇒ Object 



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# File 'lib/net/snmp/pdu.rb', line 150

def print
  puts pdu.inspect
end