3 files changed, 36 insertions, 0 deletions
diff --git a/lib/facter/arp.rb b/lib/facter/arp.rb
new file mode 100644
index 0000000..f4b7709
--- /dev/null
+++ b/lib/facter/arp.rb
@@ -0,0 +1,22 @@
+require 'facter/util/ip'
+
+Facter.add(:arp) do
+    confine :kernel => :linux
+      setcode do
+        arp = []
+        output = %x{/usr/sbin/arp -a}
+        output.each_line do |s|
+            arp.push($1) if s =~ /^\S+\s\S+\s\S+\s(\S+)\s\S+\s\S+\s\S+$/
+        end
+        arp[0]
+      end
+end
+
+Facter::Util::IP.get_interfaces.each do |interface|
+    Facter.add("arp_" + Facter::Util::IP.alphafy(interface)) do
+    confine :kernel => :linux
+       setcode do
+            Facter::Util::IP.get_arp_value(interface)
+       end
+    end
+end
diff --git a/lib/facter/util/ip.rb b/lib/facter/util/ip.rb
index e4370dc..8b6dbf4 100644
--- a/lib/facter/util/ip.rb
+++ b/lib/facter/util/ip.rb
@@ -169,4 +169,11 @@ module Facter::Util::IP
             network = ip.mask(subnet.to_s).to_s
         end
     end
+
+    def self.get_arp_value(interface)
+        arp = Facter::Util::Resolution.exec("arp -en -i #{interface} | sed -e 1d")
+        if arp =~ /^\S+\s+\w+\s+(\S+)\s+\w\s+\S+$/
+         return $1
+        end
+    end
 end
diff --git a/spec/unit/util/ip_spec.rb b/spec/unit/util/ip_spec.rb
index 1a545b8..0374e75 100755
--- a/spec/unit/util/ip_spec.rb
+++ b/spec/unit/util/ip_spec.rb
@@ -227,4 +227,11 @@ describe Facter::Util::IP do
             Facter::Util::IP.convert_from_hex?(platform).should == true
         end
     end
+
+    it "should return an arp address on Linux" do
+        Facter.stubs(:value).with(:kernel).returns("Linux")
+
+        Facter::Util::IP.expects(:get_arp_value).with("eth0").returns("00:00:0c:9f:f0:04")
+        Facter::Util::IP.get_arp_value("eth0").should == "00:00:0c:9f:f0:04"
+    end
 end