metasploit-framework/lib/msf/sanity.rb

#
# Provides some sanity checks against the ruby build and version
#


# Check for the broken pack/unpack in OS X 10.4.x
if ([1].pack('n') == "\x01\x00")
	$stderr.puts "*** This ruby build has a broken pack/unpack implementation! "
	
	if (RUBY_PLATFORM =~ /darwin/)
		$stderr.puts "    Apple shipped a broken version of ruby with the 10.4.x   "
		$stderr.puts "    release. Please install ruby from source, or use one of  "
		$stderr.puts "    the free package managers to obtain a working ruby build."
	end
	
	exit(0)
end

# Check for ruby 1.8.2 as the minimal supported version
if (RUBY_VERSION =~ /^1\.[0-7]\./ or RUBY_VERSION =~ /^1\.8\.[0-1]$/)
	$stderr.puts "*** This version of ruby is not supported, please upgrade to 1.8.2+"
	exit(0)
end

# Check for ruby 1.9.0 and throw a big nasty warning
if (RUBY_VERSION =~ /^1\.9\.0/)
	$stderr.puts "*** Ruby 1.9.0 is not supported, please upgrade to Ruby 1.9.1 or newer."
	exit(0)
end

if(RUBY_VERSION =~ /^1\.9\./)
	# Force binary encoding for Ruby versions that support it
	if(Object.const_defined?('Encoding') and Encoding.respond_to?('default_external='))
		Encoding.default_external = Encoding.default_internal = "binary"
	end
end

if(RUBY_PLATFORM == 'java')
	require 'socket'
	s = Socket.new(::Socket::AF_INET, ::Socket::SOCK_STREAM, ::Socket::IPPROTO_TCP)
	if(not s.respond_to?('bind'))
		$stderr.puts "*** JRuby will not be supported until the Socket API is complete"
		$stderr.puts "*** Information: http://jira.codehaus.org/browse/JRUBY-2739"
		trap Signal::list['INT'] do
			Thread.main.raise Interrupt.new
		end
	end
end

# Check for OpenSSL and print a warning if it is not installed
begin
	require 'openssl'
rescue ::LoadError
	$stderr.puts "*** The ruby-openssl library is not installed, many features will be disabled!"
	$stderr.puts "*** Examples: Meterpreter, SSL Sockets, SMB/NTLM Authentication, and more"
end


#
# Check for the ugly 1.8.7 short-named constants bug
#

class ConstBugTestA
	Const = 'A'
	def test
		Const == 'A'
	end
end

ConstBugTestC = ConstBugTestA.dup

class ConstBugTestB < ConstBugTestC
	Const = 'B'
end

def ruby_187_const_bug
	bugged = false

	begin
		ConstBugTestA.new.test()
		ConstBugTestB.new.test()
	rescue ::NameError
		bugged = true
	end
	
	bugged
end

if(ruby_187_const_bug())
	$stderr.puts ""
	$stderr.puts "***********************************************************************"
	$stderr.puts "***                                                                   *"
	$stderr.puts "*** This version of the Ruby interpreter contains a serious bug       *"
	$stderr.puts "*** related to short-named constants, we strongly recommend that you  *"
	$stderr.puts "*** switch to a fixed version. Unfortunately, some Linux distros have *"
	$stderr.puts "*** backported the buggy patch into 1.8.6, so you may need to contact *"
	$stderr.puts "*** your vendor and ask them to review the URL below.                 *"
	$stderr.puts "***                                                                   *"
	$stderr.puts "*** Alternatively, you can download, build, and install the latest    *"
	$stderr.puts "*** stable snapshot of Ruby from the following URL:                   *"	
	$stderr.puts "***  - http://www.ruby-lang.org/                                      *"
	$stderr.puts "***                                                                   *"	
	$stderr.puts "*** For more information, please see the following URL:               *"
	$stderr.puts "***  - https://bugs.launchpad.net/bugs/282302                         *"
	$stderr.puts "***                                                                   *"
	$stderr.puts "***********************************************************************"
	$stderr.puts ""
end