Class: SendNsca::NscaConnection

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

Constant Summary collapse

PACKET_VERSION = 
3
PACK_STRING = 
"nxx N a4 n a64 a128 a512xx"
CRC_TABLE = 
[ 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ NscaConnection

Returns a new instance of NscaConnection.



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# File 'lib/send_nsca/send_nsca.rb', line 48

def initialize(args)
  
  # connecting to nagios
  @nscahost = args[:nscahost]
  @port = args[:port]
  @hostname = args[:hostname]
  @service = args[:service]
  @return_code = args[:return_code]
  @status = args[:status]
  @connected = false

end

Instance Attribute Details

#connected ⇒ Object (readonly)

connection status and error if one found



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# File 'lib/send_nsca/send_nsca.rb', line 19

def connected
  @connected
end

#crc ⇒ Object

for sending to nsca



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# File 'lib/send_nsca/send_nsca.rb', line 42

def crc
  @crc
end

#error ⇒ Object (readonly)

Returns the value of attribute error.



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# File 'lib/send_nsca/send_nsca.rb', line 20

def error
  @error
end

#hostname ⇒ Object

status data to send to nagios Currently all 4 are required, meaning we only support ‘service’ passive checkins. todo: add host checkins



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# File 'lib/send_nsca/send_nsca.rb', line 36

def hostname
  @hostname
end

#nscahost ⇒ Object

params for connecting to the nsca/nagios server



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# File 'lib/send_nsca/send_nsca.rb', line 15

def nscahost
  @nscahost
end

#port ⇒ Object

Returns the value of attribute port.



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# File 'lib/send_nsca/send_nsca.rb', line 16

def port
  @port
end

#return_code ⇒ Object

Returns the value of attribute return_code.



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# File 'lib/send_nsca/send_nsca.rb', line 38

def return_code
  @return_code
end

#service ⇒ Object

Returns the value of attribute service.



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

def service
  @service
end

#status ⇒ Object

Returns the value of attribute status.



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# File 'lib/send_nsca/send_nsca.rb', line 39

def status
  @status
end

#timestamp ⇒ Object

Returns the value of attribute timestamp.



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# File 'lib/send_nsca/send_nsca.rb', line 31

def timestamp
  @timestamp
end

#timestamp_hex ⇒ Object

Returns the value of attribute timestamp_hex.



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# File 'lib/send_nsca/send_nsca.rb', line 30

def timestamp_hex
  @timestamp_hex
end

#timestring ⇒ Object

Returns the value of attribute timestring.



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# File 'lib/send_nsca/send_nsca.rb', line 29

def timestring
  @timestring
end

#xor_key ⇒ Object

Returns the value of attribute xor_key.



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# File 'lib/send_nsca/send_nsca.rb', line 28

def xor_key
  @xor_key
end

#xor_key_and_timestamp ⇒ Object

read from the nsca/nagios server



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# File 'lib/send_nsca/send_nsca.rb', line 23

def xor_key_and_timestamp
  @xor_key_and_timestamp
end

#xor_key_and_timestamp_str ⇒ Object

converted from :xor_key_and_timestamp



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# File 'lib/send_nsca/send_nsca.rb', line 26

def xor_key_and_timestamp_str
  @xor_key_and_timestamp_str
end

#xor_key_string ⇒ Object

Returns the value of attribute xor_key_string.



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# File 'lib/send_nsca/send_nsca.rb', line 27

def xor_key_string
  @xor_key_string
end

Class Method Details

.crc32(c) ⇒ Object 



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# File 'lib/send_nsca/send_nsca.rb', line 123

def self.crc32(c)
    r = 0xFFFFFFFF
    c.each_byte do |b|
        r ^= b
        8.times do
          r = (r>>1) ^ (0xEDB88320 * (r & 1))
        end
    end
    r ^ 0xFFFFFFFF
end

.xor(xor_key, str) ⇒ Object 



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# File 'lib/send_nsca/send_nsca.rb', line 134

def self.xor(xor_key, str)

  str_a = str.unpack("C*")
  key_a = xor_key.unpack("C*")
  
  result = []
  key_index = 0
  str_index = 0
  str_a.each do |c|
    result[str_index] = str_a[str_index] ^ key_a[key_index]
    str_index += 1
    key_index = key_index == xor_key.length-1 ? 0 : key_index += 1
  end
  ret_val = result.pack("C*")
end

Instance Method Details

#connect_and_get_keys ⇒ Object 



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# File 'lib/send_nsca/send_nsca.rb', line 61

def connect_and_get_keys
  begin
    timeout(1) do #the server has one second to answer
      @tcp_client = TCPSocket.open(@nscahost, @port)
      @connected = true
      @xor_key_and_timestamp = @tcp_client.recv(132)
    end
  rescue
    @connected = false
    @error = "send_ncsa - error connecting to nsca/nagios: #{$!}"
    puts  @error
    raise # re-raise same exception
  end
  timestamp_for_logging
end

#convert_timestamp ⇒ Object 



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# File 'lib/send_nsca/send_nsca.rb', line 77

def convert_timestamp
  # convert timestamp for use in comm to nagios
  @timestring = @xor_key_and_timestamp[@xor_key_and_timestamp.length-4,@xor_key_and_timestamp.length]
end

#convert_xor_key ⇒ Object 



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# File 'lib/send_nsca/send_nsca.rb', line 90

def convert_xor_key
  # strip off the last 4 characters which are the timestamp
  @xor_key = @xor_key_and_timestamp[0,@xor_key_and_timestamp.length-4]
end

#intialize_nsca_connection ⇒ Object 



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# File 'lib/send_nsca/send_nsca.rb', line 95

def intialize_nsca_connection
  connect_and_get_keys
  convert_timestamp
  convert_xor_key
end

#send_nsca ⇒ Object 



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# File 'lib/send_nsca/send_nsca.rb', line 101

def send_nsca
  intialize_nsca_connection
  @crc = 0 
  nsca_params = [PACKET_VERSION, @crc, @timestring, @return_code, @hostname, @service, @status ]
  string_to_send_without_crc = nsca_params.pack(PACK_STRING)
  
  @crc = SendNsca::NscaConnection.crc32(string_to_send_without_crc)
  nsca_params = [PACKET_VERSION, @crc, @timestring, @return_code, @hostname, @service, @status ]
  string_to_send_with_crc = nsca_params.pack(PACK_STRING)
  
#      puts("DEBUG: PACKET_VERSION = #{PACKET_VERSION},\n @crc = #{@crc},\n  @timestring = #{@timestring},\n  @timestamp_hex = #{Time.at(timestamp_hex)},\n  @return_code #{@return_code},\n  @hostname = #{@hostname},\n  @service = #{@service},\n  @status = #{@status}\n")
#      puts "string_to_send_with_crc = #{string_to_send_with_crc.length}"
#      puts "string_to_send_with_crc = #{string_to_send_with_crc.unpack('H*')}"
  
   encrypted_string_to_send = SendNsca::NscaConnection.xor(@xor_key, string_to_send_with_crc)
#      puts "encrypted_string_to_send = #{encrypted_string_to_send.length}"
#      puts "encrypted_string_to_send = #{encrypted_string_to_send.unpack('H*')}"

  @tcp_client.send(encrypted_string_to_send, 0)
  @tcp_client.close
end

#timestamp_for_logging ⇒ Object 



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# File 'lib/send_nsca/send_nsca.rb', line 82

def timestamp_for_logging
  # convert timestamp in a format we can log
  @xor_key_and_timestamp_str = @xor_key_and_timestamp.unpack("H*")
  @timestring_for_log = @xor_key_and_timestamp_str[0][256,8]
  @timestamp_hex = @timestring_for_log.hex
  @timestamp = Time.at(@timestamp_hex)
end