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require 'ipaddr'
# Custom function to lookup the interface which matches the subnet
# of the provided IP address.
# The function iterates over all the interfaces and chooses the
# first locally assigned interface which matches the IP.
module Puppet::Parser::Functions
newfunction(:interface_for_ip, :type => :rvalue, :doc => "Find the bind IP address for the provided subnet.") do |arg|
if arg[0].class == String
begin
ip_to_find = arg[0]
Dir.foreach('/sys/class/net/') do |interface|
next if interface == '.' or interface == '..'
iface_no_dash = interface.gsub('-', '_')
interface_ip = lookupvar("ipaddress_#{iface_no_dash}")
netmask = lookupvar("netmask_#{iface_no_dash}")
if not interface_ip.nil? then
ip1=IPAddr.new(interface_ip)
ip2=IPAddr.new(ip_to_find)
if ip1.mask(netmask) == ip2.mask(netmask) then
return interface
end
end
end
rescue JSON::ParserError
raise Puppet::ParseError, "Syntax error: #{arg[0]} is invalid"
end
else
raise Puppet::ParseError, "Syntax error: #{arg[0]} is not a String"
end
return ''
end
end
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