Import source code for dummynet innode emulation.

[ipfw.git] / ipfw-cleanup

diff --git a/ipfw-cleanup b/ipfw-cleanup
new file mode 100755 (executable)
index 0000000..429328a
--- /dev/null
+++ b/ipfw-cleanup
@@ -0,0 +1,55 @@
+#!/bin/sh
+#
+# Marta Carbone
+# Copyright (C) 2009 Universita` di Pisa
+# $Id$
+#
+# This script parse the ipfw rules
+# and remove the old ones.
+#
+# The ipfw output is parsed and each time
+# value stored as comment is compared against
+# the current time.
+# If the time value is older than current,
+# the rules and related pipes will be deleted.
+#
+# $Id$
+
+RULE_LIST="ipfw show"
+# Get $NOW referred to UTC
+NOW=`date -u +%s`
+
+# check for module existence
+/sbin/lsmod | grep ipfw
+if [ x"$?" == x"1" ]; then
+       echo "ipfw module does not exist";
+       exit 0;
+fi
+
+${RULE_LIST} | 
+awk '
+       BEGIN {
+               print now a "Start to clean rules ";
+               cleaned=0;
+       }
+
+       # delete rules and pipes
+       function delete_rule(rule_id) {
+               command="/sbin/ipfw delete " rule_id "; ipfw pipe delete " rule_id;
+               system(command);
+       }
+
+       # awk main body
+       /\/\/\ [0-9]*/ { # select timeout string
+
+                       timeout=$13;
+
+                       if (now > timeout) {
+                               delete_rule($1);
+                               cleaned++;
+                       }
+       }
+
+       END {   print " " cleaned " rules cleaned";
+       }
+' now=${NOW}