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# frozen_string_literal: true
#
# Copyright (c) 2004-2014 David R. Halliday
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
require 'snmp'
require 'socket'
require 'logger'
module SNMP
class Agent #:nodoc:all
def initialize(listen_port=161, max_packet=8000)
@log = Logger.new(STDOUT)
@log.level = Logger::DEBUG
@max_packet = max_packet
@socket = UDPSocket.open
@socket.bind(nil, listen_port)
@mib = MIB::SystemMIB.new
end
def start
@log.info "SNMP agent running"
loop do
begin
data, remote_info = @socket.recvfrom(@max_packet)
puts "Received #{data.length} bytes"
p data
message = Message.decode(data)
case message.pdu
when GetRequest
response = message.response
response.pdu.varbind_list.each do |v|
v.value = @mib.get(v.name)
end
when SetRequest
response = message.response
else
raise "invalid message #{message.to_s}"
end
puts "Responding to #{remote_info[3]}:#{remote_info[1]}"
encoded_message = response.encode
n=@socket.send(encoded_message, 0, remote_info[3], remote_info[1])
p encoded_message
rescue => e
@log.error e
shutdown
end
end
end
def shutdown
@log.info "SNMP agent stopping"
@socket.close
exit
end
alias stop :shutdown
end
end
if $0 == __FILE__
agent = SNMP::Agent.new(1061)
trap("INT") { agent.shutdown }
agent.start
end
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