Improve undefined interface checking

git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@1225 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb

Shorewall2/functions

@@ -502,11 +502,11 @@ ip_vlsm() {
 
 #
 # Chain name base for an interface -- replace all periods with underscores in the passed name.
-#                                     The result is echoed (less "+" and anything following).
+#                                     The result is echoed (less trailing "+").
 #
 chain_base() #$1 = interface
 {
-    local c=${1%%+*}
+    local c=${1%%+}
 
     while true; do
 	case $c in
@@ -524,31 +524,18 @@ chain_base() #$1 = interface
     done
 }
 
-#
-# Remove trailing digits from a name
-#
-strip_trailing_digits() {
-    echo $1 | sed s'/[0-9].*$//'
-}
-
 #
 # Loosly Match the name of an interface
 #
 
 if_match() # $1 = Name in interfaces file - may end in "+"
-           # $2 = Name from routing table
+           # $2 = Full interface name - may also end in "+"
 {
-    local if_file=$1
-    local rt_table=$2
+    local pattern=${1%+}
+    local interface=${2%+}
 
-    case $if_file in
-	*+)
-	    test "$(strip_trailing_digits $rt_table)" = "${if_file%+}"
-	    ;;
-	*)
-	    test "$rt_table" = "$if_file"
-	    ;;
-    esac
+    test  "x${interface:0:${#pattern}}" = "x${pattern}"
+    
 }
 
 #