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require 'custodian/settings'
require 'ipaddr'
require 'socket'
require 'timeout'
#
# This class is responsible for doing forward/reverse DNS lookups
#
module Custodian
module Util
class DNS
#
# Return the reverse DNS for the specified IP address, nil on failure.
#
def DNS.ip_to_hostname(ip)
resolved = nil
#
# Get the timeout period.
#
settings = Custodian::Settings.instance
period = settings.timeout
begin
timeout(period) do
begin
resolved = Socket.getnameinfo(Socket.sockaddr_in(80, ip)).first
rescue SocketError
resolved = nil
end
end
rescue Timeout::Error => e
resolved = nil
end
resolved
end
#
# Convert a hostname to an IP address, return nil on failure.
#
def DNS.hostname_to_ip(hostname)
resolved = nil
#
# Get the timeout period.
#
settings = Custodian::Settings.instance
period = settings.timeout
begin
timeout(period) do
begin
Socket.getaddrinfo(hostname, 'echo').each do |a|
resolved = a[3] if a
end
rescue SocketError
resolved = nil
end
end
rescue Timeout::Error => e
resolved = nil
end
resolved
end
end
end
end
|
