Land #2944, add platforms to encoders

This allows encoders to advertise compatibility with a particular
platform (or more accurately, non-compatibility with everything that
isn't that platform).

See also #2939

lib/msf/core/exploit.rb

@@ -746,7 +746,7 @@ class Exploit < Msf::Module
     c_arch     = (target and target.arch)     ? target.arch     : (arch == []) ? nil : arch
 
     framework.encoders.each_module_ranked(
-      'Arch' => c_arch) { |name, mod|
+      'Arch' => c_arch, 'Platform' => c_platform) { |name, mod|
 
       encoders << [ name, mod ]
     }

lib/msf/core/payload.rb

@@ -414,7 +414,7 @@ class Payload < Msf::Module
     encoders = []
 
     framework.encoders.each_module_ranked(
-      'Arch' => self.arch) { |name, mod|
+      'Arch' => self.arch, 'Platform' => self.platform) { |name, mod|
       encoders << [ name, mod ]
     }
 

modules/encoders/cmd/generic_sh.rb

@@ -20,7 +20,8 @@ class Metasploit3 < Msf::Encoder
       tricks to avoid commonly restricted characters.
       },
       'Author'           => 'hdm',
-      'Arch'             => ARCH_CMD)
+      'Arch'             => ARCH_CMD,
+      'Platform'         => 'unix')
   end
 
 

modules/encoders/cmd/ifs.rb

@@ -21,7 +21,8 @@ class Metasploit3 < Msf::Encoder
         to avoid spaces without being overly fancy.
       },
       'Author'           => 'egypt',
-      'Arch'             => ARCH_CMD)
+      'Arch'             => ARCH_CMD,
+      'Platform'         => 'unix')
   end
 
 

modules/encoders/cmd/printf_php_mq.rb

@@ -30,6 +30,7 @@ class Metasploit3 < Msf::Encoder
       },
       'Author'           => 'jduck',
       'Arch'             => ARCH_CMD,
+      'Platform'         => 'unix',
       'EncoderType'      => Msf::Encoder::Type::PrintfPHPMagicQuotes)
   end