A (broken) brew for sigmavpn

brew-sigmavpn.rb

require "formula"

class Sigmavpn < Formula
  homepage "http://frozenriver.net/SigmaVPN"
  url "https://codeload.github.com/neilalexander/sigmavpn/tar.gz/0.3alpha1"
  sha1 "49020d4db52878756fbbc45c05c2deeedaa7b6d2"

  head do
    url 'https://github.com/neilalexander/sigmavpn.git'
  end

  depends_on 'libsodium'

  pubkey_self  = '0' * 64
  config_file  = "#{etc}/sigmavpn.conf"
  ip_addr      = ENV['SIGMAVPN_ADDRESS']     || '127.0.0.1'
  port         = ENV['SIGMAVPN_PORT']        || '7654'
  device       = ENV['SIGMAVPN_DEVICE']      || '/dev/tun0'
  peername     = ENV['SIGMAVPN_PEER']        || 'name_of_peer'
  pubkey_other = ENV['SIGMAVPN_PEER_PUBKEY'] || '0' * 64

  def install
    ENV["INSTALLDIR"]      = prefix
    ENV["SYSCONFDIR"]      = etc
    ENV["SODIUM_CPPFLAGS"] = ""
    ENV["SODIUM_LDFLAGS"]  = "-lsodium"

    system "make", "install"

    # create a default configuration file

    keypairs     = Hash[`./naclkeypair`.scan(/(PRIVATE|PUBLIC) KEY: ([0-9a-f]{64})/)]
    privkey_self = keypairs['PRIVATE']
    pubkey_self  = keypairs['PUBLIC']

    inreplace config_file do |s|
      <<-CONFIG_EOF.undent
        [#{peername}]
        proto = nacltai
        proto_privatekey = #{privkey_self}
        proto_publickey = #{pubkey_other}
        local = tuntap
        local_interface = #{device}
        local_tunmode = 1
        peer = udp
        peer_remotefloat = 1
        peer_ipv6 = 0
        peer_localport = #{port}
        peer_localaddr = #{ip_addr}
      CONFIG_EOF
    end 
  end

  caveat
    s = ""
    unless ENV['SIGMAVPN_ADDRESS'] && ENV['SIGMAVPN_PEER_PUBKEY']
      s += <<-EOS.undent
        Set these variables before calling brew to generate a fully usable configuration:
          SIGMAVPN_ADDRESS      local udp address
          SIGMAVPN_PORT         local udp port
          SIGMAVPN_DEVICE       device name, usually /dev/tun0
          SIGMAVPN_PEER         peer name
          SIGMAVPN_PEER_PUBKEY  peer public key
        
      EOS
    end
    s += <<-EOS.undent
      The configuration is located at
        #{config_file}
      Read https://code.google.com/p/sigmavpn/wiki/Configuration for available options.
      
      Add your public key and your address to the configuration file used by your peer:
      proto_publickey = #{pubkey_self}
      peer_remoteaddr = #{ip_addr}
      
      Further directions can be found at
      https://code.google.com/p/sigmavpn/wiki/SecureTunnelHowto
    EOS
    s
  end

  test do
    system "naclkeypair"
  end
end