Read list of tables/targets/matches

lib/linux/iptables.rb

@@ -36,6 +36,22 @@ module Linux
     def self.table(tablename = "filter")
       @tables[tablename] ||= new(tablename, socket)
     end
+    
+    def self.tables
+      proc_read(self::PROC_TABLES)
+    end
+    
+    def self.targets
+      proc_read(self::PROC_TARGETS)
+    end
+    
+    def self.matches
+      proc_read(self::PROC_MATCHES)
+    end
+    
+    def self.proc_read(filename)
+      File.readlines(filename).each { |x| x.chomp! }
+    end
 
     def initialize(name, socket)
       raise "Invalid table name" if name.bytesize > self.class::TABLE_MAXNAMELEN

lib/linux/iptables4.rb

@@ -60,6 +60,10 @@ module Linux
   # Class for handling iptables. Note that this doesn't actually use
   # Netlink at all :-(
   class Iptables4 < Iptables
+    PROC_TABLES		= "/proc/net/ip_tables_names"
+    PROC_TARGETS	= "/proc/net/ip_tables_targets"
+    PROC_MATCHES	= "/proc/net/ip_tables_matches"
+
     TABLE_MAXNAMELEN	= IPT_TABLE_MAXNAMELEN
     TC_AF		= Socket::AF_INET
     TC_IPPROTO		= Socket::IPPROTO_IP
@@ -73,5 +77,6 @@ end
 
 if __FILE__ == $0
   require 'pp'
+  pp Linux::Iptables4.tables
   pp Linux::Iptables4.table("filter").rules
 end