1 files changed, 61 insertions, 0 deletions
diff --git a/wireguardmeshgenerator.rb b/wireguardmeshgenerator.rb
new file mode 100644
index 0000000..656586a
--- /dev/null
+++ b/wireguardmeshgenerator.rb
@@ -0,0 +1,61 @@
+#!/usr/bin/ruby
+
+require 'fileutils'
+
+HOSTS = {
+  f0: { lan: { domain: 'lan.buetow.org', ip: '192.168.1.130' },
+        wg0: { domain: 'wg0.buetow.org', ip: '192.168.2.130' } },
+  f1: { lan: { domain: 'lan.buetow.org', ip: '192.168.1.131' },
+        wg0: { domain: 'wg0.buetow.org', ip: '192.168.2.131' } },
+  f2: { lan: { domain: 'lan.buetow.org', ip: '192.168.1.132' },
+        wg0: { domain: 'wg0.buetow.org', ip: '192.168.2.132' } },
+  r0: { lan: { domain: 'lan.buetow.org', ip: '192.168.1.120' },
+        wg0: { domain: 'wg0.buetow.org', ip: '192.168.2.120' } },
+  r1: { lan: { domain: 'lan.buetow.org', ip: '192.168.1.121' },
+        wg0: { domain: 'wg0.buetow.org', ip: '192.168.2.121' } },
+  r2: { lan: { domain: 'lan.buetow.org', ip: '192.168.1.122' },
+        wg0: { domain: 'wg0.buetow.org', ip: '192.168.2.122' } }
+}.freeze
+
+PeerSnippet = Struct.new(:description, :public_key, :preshared_key, :allowed_ips) do
+  def to_s
+    <<~PEER_CONFIG
+      [Peer]
+      # #{description}
+      PublicKey = #{public_key}
+      PresharedKey = #{preshared_key}
+      AllowedIPs = #{allowed_ips}
+    PEER_CONFIG
+  end
+end
+
+WireguardConfig = Struct.new(:myself, :hosts) do
+  def to_s
+    peers = hosts.map do |name, data|
+      PeerSnippet.new("#{name}.#{data[:wg0][:domain]}",
+                      :PUB_KEY, :PRESHARED_KEY, "#{data[:wg0][:ip]}/32")
+    end
+
+    <<~CONFIG
+      [Interface]
+      Address = #{hosts[myself][:wg0][:ip]}
+      PrivateKey = #{private_key}
+
+      #{peers.map(&:to_s).join("\n")}
+    CONFIG
+  end
+
+  private
+
+  def private_key = 'PRIVATE_KEY'
+end
+
+HOSTS.each_key do |name|
+  config_dir = "dist/#{name}/etc/wireguard"
+  config_path = "#{config_dir}/wg0.conf"
+  FileUtils.mkdir_p(config_dir) unless Dir.exist?(config_dir)
+
+  wg0 = WireguardConfig.new(name, HOSTS)
+  puts "Generating config for #{name} at #{config_path}"
+  File.write(config_path, wg0.to_s)
+end