Set default egress IP from ifconfig.me (#454)

* Set default egress IP from ifconfig.me

* Try consume attributes

omnibus/cookbooks/firezone/recipes/network.rb

@@ -15,18 +15,26 @@
 include_recipe 'line::default'
 
 require 'mixlib/shellout'
+require 'net/http'
 
 # Use ip route for finding default egress interface
-awk_path = "#{node['firezone']['install_directory']}/embedded/bin/awk"
 egress_int_cmd = Mixlib::ShellOut.new("ip route show default 0.0.0.0/0 | grep -oP '(?<=dev ).*' | cut -f1 -d' '")
 egress_interface = egress_int_cmd.run_command.stdout.chomp
-# Set default endpoint ip to default egress ip
-egress_addr_cmd = "ip address show dev #{egress_interface} | grep 'inet ' | #{awk_path} '{print $2}'"
-egress_ip = Mixlib::ShellOut.new(egress_addr_cmd)
-egress_ip.run_command
 
-node.default['firezone']['wireguard']['endpoint'] ||= egress_ip.stdout.chomp.gsub(%r{/.*}, '')
-node.default['firezone']['egress_interface'] = egress_interface
+unless node['firezone']['wireguard']['endpoint']
+  # Figure out a sane default endpoint IP address
+  egress_ip =
+    begin
+      Net::HTTP.get('ifconfig.me', '/')
+    rescue StandardError
+      nil
+    end
+  node.consume_attributes('firezone' => { 'wireguard' => { 'endpoint' => egress_ip } })
+end
+
+unless node['firezone']['egress_interface']
+  node.consume_attributes('firezone' => { 'egress_interface' => egress_interface })
+end
 
 replace_or_add 'IPv4 packet forwarding' do
   path '/etc/sysctl.conf'