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Viewing File: hostname.rb

#
# Author:: Adam Jacob (<adam@chef.io>)
# Author:: Benjamin Black (<nostromo@gmail.com>)
# Author:: Bryan McLellan (<btm@loftninjas.org>)
# Author:: Daniel DeLeo (<dan@kallistec.com>)
# Author:: Doug MacEachern (<dougm@vmware.com>)
# Author:: James Gartrell (<jgartrel@gmail.com>)
# Author:: Isa Farnik (<isa@chef.io>)
# Copyright:: Copyright (c) 2008-2018, Chef Software Inc.
# Copyright:: Copyright (c) 2009 Bryan McLellan
# Copyright:: Copyright (c) 2009 Daniel DeLeo
# Copyright:: Copyright (c) 2010 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.
#

Ohai.plugin(:Hostname) do
  require "socket" unless defined?(Socket)
  require "ipaddr"

  provides "domain", "hostname", "fqdn", "machinename"

  # hostname : short hostname
  # machinename : output of hostname command (might be short on solaris)
  # fqdn : result of canonicalizing hostname using DNS or /etc/hosts
  # domain : domain part of FQDN
  #
  # hostname and machinename should always exist
  # fqdn and domain may be broken if DNS is broken on the host

  def from_cmd(cmd)
    so = shell_out(cmd)
    so.stdout.split($/)[0]
  end

  # forward and reverse lookup to canonicalize FQDN (hostname -f equivalent)
  # this is ipv6-safe, works on ruby 1.8.7+
  def resolve_fqdn
    hostname = from_cmd("hostname")
    addrinfo = Socket.getaddrinfo(hostname, nil).first
    iaddr = IPAddr.new(addrinfo[3])
    Socket.gethostbyaddr(iaddr.hton)[0]
  rescue
    nil
  end

  def collect_domain
    # Domain is everything after the first dot
    if fqdn
      fqdn =~ /.+?\.(.*)/
      domain $1
    end
  end

  def collect_hostname
    # Hostname is everything before the first dot
    if machinename
      machinename =~ /([^.]+)\.?/
      hostname $1
    elsif fqdn
      fqdn =~ /(.+?)\./
      hostname $1
    end
  end

  collect_data(:default) do
    machinename from_cmd("hostname")
    fqdn resolve_fqdn
    collect_hostname
    collect_domain
  end

  collect_data(:aix) do
    machinename from_cmd("hostname -s")
    fqdn resolve_fqdn || from_cmd("hostname")
    collect_hostname
    collect_domain
  end

  collect_data(:netbsd, :openbsd, :dragonflybsd) do
    hostname from_cmd("hostname -s")
    fqdn resolve_fqdn
    machinename from_cmd("hostname")
    collect_domain
  end

  collect_data(:darwin) do
    hostname from_cmd("hostname -s")
    machinename from_cmd("hostname")
    begin
      our_fqdn = resolve_fqdn
      # Sometimes... very rarely, but sometimes, 'hostname --fqdn' falsely
      # returns a blank string. WTF.
      if our_fqdn.nil? || our_fqdn.empty?
        logger.trace("Plugin Hostname: hostname returned an empty string, retrying once.")
        our_fqdn = resolve_fqdn
      end

      if our_fqdn.nil? || our_fqdn.empty?
        logger.trace("Plugin Hostname: hostname returned an empty string twice and will" +
                        "not be set.")
      else
        fqdn our_fqdn
      end
    rescue
      logger.trace(
        "Plugin Hostname: hostname returned an error, probably no domain set"
      )
    end
    domain collect_domain
  end

  collect_data(:freebsd) do
    hostname from_cmd("hostname -s")
    machinename from_cmd("hostname")
    fqdn from_cmd("hostname -f")
    collect_domain
  end

  collect_data(:linux) do
    hostname from_cmd("hostname -s")
    machinename from_cmd("hostname")
    begin
      our_fqdn = from_cmd("hostname --fqdn")
      # Sometimes... very rarely, but sometimes, 'hostname --fqdn' falsely
      # returns a blank string. WTF.
      if our_fqdn.nil? || our_fqdn.empty?
        logger.trace("Plugin Hostname: hostname --fqdn returned an empty string, retrying " +
                        "once.")
        our_fqdn = from_cmd("hostname --fqdn")
      end

      if our_fqdn.nil? || our_fqdn.empty?
        logger.trace("Plugin Hostname: hostname --fqdn returned an empty string twice and " +
                        "will not be set.")
      else
        fqdn our_fqdn
      end
    rescue
      logger.trace("Plugin Hostname: hostname --fqdn returned an error, probably no domain set")
    end
    domain collect_domain
  end

  collect_data(:solaris2) do
    machinename from_cmd("hostname")
    hostname from_cmd("hostname")
    fqdn resolve_fqdn
    domain collect_domain
  end

  collect_data(:windows) do
    require "wmi-lite/wmi"
    require "socket" unless defined?(Socket)

    wmi = WmiLite::Wmi.new
    host = wmi.first_of("Win32_ComputerSystem")

    hostname host["dnshostname"].to_s
    machinename host["name"].to_s

    info = Socket.gethostbyname(Socket.gethostname)
    if /.+?\.(.*)/.match?(info.first)
      fqdn info.first
    else
      # host is not in dns. optionally use:
      # C:\WINDOWS\system32\drivers\etc\hosts
      info[3..info.length].reverse_each do |addr|
        hostent = Socket.gethostbyaddr(addr)
        if /.+?\.(.*)/.match?(hostent.first)
          fqdn hostent.first
          break
        end
      end
      fqdn info.first unless fqdn
    end
    domain collect_domain
  end
end