/usr/lib/ruby/vendor_ruby/ohai/plugins/network_listeners.rb is in ohai 6.14.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Author:: Doug MacEachern <dougm@vmware.com>
# Copyright:: Copyright (c) 2009 VMware, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'sigar'
provides "network/listeners"
require_plugin "network"
flags = Sigar::NETCONN_TCP|Sigar::NETCONN_SERVER
listeners = Mash.new
sigar = Sigar.new
sigar.net_connection_list(flags).each do |conn|
port = conn.local_port
addr = conn.local_address.to_s
if addr == "0.0.0.0" || addr == "::"
addr = "*"
end
listeners[port] = Mash.new
listeners[port][:address] = addr
begin
pid = sigar.proc_port(conn.type, port)
listeners[port][:pid] = pid
listeners[port][:name] = sigar.proc_state(pid).name
rescue
end
end
network[:listeners] = Mash.new
network[:listeners][:tcp] = listeners
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