dnscrypt-proxy 1.3.0

Closes Homebrew/homebrew#19488.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/dnscrypt-proxy.rb

@@ -26,4 +26,55 @@ class DnscryptProxy < Formula
     system "./configure", *args
     system "make install"
   end
+
+  def caveats; <<-EOS.undent
+    Once dnscrypt-proxy is running, you will have to update your local
+    DNS server to point to 127.0.0.1 in order for it to actually work.
+    This is generally done under System Preferences > Network > Advanced.
+    Once there, you will see a "DNS" tab where you can enter a list of DNS
+    servers. You will want to make sure that 127.0.0.1 is listed there first.
+
+    Note: By default, dnscrypt-proxy runs on 127.0.0.1:53 under the "nobody" user.
+    If you would like to change these settings, you will have to edit the plist file.
+
+    To check that dnscrypt-proxy is running properly, open Terminal and enter this at
+    the command prompt:
+
+        nslookup -type=txt debug.opendns.com
+
+    You should see something like this in the output:
+
+        debug.opendns.com text = "dnscrypt enabled (...)"
+    EOS
+  end
+
+  plist_options :startup => true
+
+  def plist; <<-EOS.undent
+    <?xml version="1.0" encoding="UTF-8"?>
+    <!DOCTYPE plist PUBLIC "-/Apple/DTD PLIST 1.0/EN" "http:/www.apple.com/DTDs/PropertyList-1.0.dtd">
+    <plist version="1.0">
+      <dict>
+        <key>Label</key>
+        <string>#{plist_name}</string>
+        <key>KeepAlive</key>
+        <true/>
+        <key>RunAtLoad</key>
+        <true/>
+        <key>ProgramArguments</key>
+        <array>
+          <string>#{opt_prefix}/sbin/dnscrypt-proxy</string>
+          <string>--local-address=127.0.0.1:53</string>
+          <string>--user=nobody</string>
+        </array>
+        <key>UserName</key>
+        <string>root</string>
+        <key>StandardErrorPath</key>
+        <string>/dev/null</string>
+        <key>StandardOutPath</key>
+        <string>/dev/null</string>
+      </dict>
+    </plist>
+    EOS
+  end
 end