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143 lines
4.8 KiB
Plaintext
143 lines
4.8 KiB
Plaintext
#
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# Shorewall -- /usr/share/shorewall/action.IfEvent
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#
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# Perform an Action based on a Event
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#
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# Parameters:
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#
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# Event - Must start with a letter and be composed of letters, digits,
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# '-', and '_'.
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# Action - Anything that can appear in the ACTION column of a rule.
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# Duration - Duration in seconds over which the event is to be tested.
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# Hit Count - Number of packets seen within the duration -- default is 1
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# Src or Dest - 'src' (default) or 'dst'. Determines if the event is
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# associated with the source address (src) or destination
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# address (dst)
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# Command - 'check' (default) 'reset', or 'update'. If 'reset',
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# the event will be reset before the Action is taken.
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# If 'update', the timestamp associated with the event will
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# be updated and the action taken if the time limit/hitcount
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# are matched.
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# If '-', the action will be taken if the limit/hitcount are
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# matched but the event's timestamp will not be updated.
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#
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# If a duration is specified, then 'checkreap' and 'updatereap'
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# may also be used. These are like 'check' and 'update'
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# respectively, but they also remove any event entries for
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# the IP address that are older than <duration> seconds.
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# Disposition - Disposition for any event generated.
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#
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# For additional information, see http://www.shorewall.net/Events.html
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#
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###############################################################################
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# DO NOT REMOVE THE FOLLOWING LINE
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###############################################################################
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#ACTION SOURCE DEST PROTO DPORT SPORT
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DEFAULTS -,ACCEPT,-,1,src,check,-
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?begin perl
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use Shorewall::Config qw(:DEFAULT :internal);
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use Shorewall::Chains;
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use Shorewall::Rules;
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use strict;
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my ( $event, $action, $duration, $hitcount, $destination, $command, $disposition ) = get_action_params( 7 );
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fatal_error "An event name is required" unless supplied $event;
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fatal_error "Invalid event name ($event)" unless $event =~ /^[a-zA-z][-\w]*$/;
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if ( supplied $duration ) {
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fatal_error "Invalid time limit ($duration)" unless $duration =~ /^\d+$/;
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$duration = "--seconds $duration ";
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} else {
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$duration = '';
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}
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fatal_error "Invalid hit count ($hitcount)" unless $hitcount =~ /^\d+$/;
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fatal_error "Invalid Src or Dest ($destination)" unless $destination =~ /^(?:src|dst)$/;
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my $srcdst = $destination eq 'src'? '--rsource' : '--rdest';
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our $commands_defined;
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#
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# Can't 'use constant' here
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#
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my ( $UPDATE_CMD, $CHECK_CMD, $RESET_CMD, $REAP_OPT, $TTL_OPT ) = ( 1, 2, 4, 8, 16 );
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my %command = ( check => $CHECK_CMD,
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update => $UPDATE_CMD,
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reset => $RESET_CMD
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);
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my %commandopts = (
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reap => $REAP_OPT,
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ttl => $TTL_OPT
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);
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my @command = split(':', $command);
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$command = $command{shift @command} || 0;
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fatal_error "Command must be 'check', 'update' or 'reset" unless $command & ( $CHECK_CMD | $UPDATE_CMD | $RESET_CMD);
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for ( @command ) {
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fatal_error "Invalid command option ($_)" unless $commandopts{$_};
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if ( $command & $commandopts{$_} ) {
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warning_message "Duplicate command ($_)";
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} else {
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$command |= $commandopts{$_};
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}
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}
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my $duplicate;
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set_action_disposition( $disposition) if supplied $disposition;
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set_action_name_to_caller;
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require_capability 'RECENT_MATCH', 'Use of events', 's';
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if ( $command & $REAP_OPT ) {
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require_capability( 'REAP_OPTION', q(The 'reap' option), 's' );
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fatal_error "${command}reap requires a time limit" unless $duration;
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$duration .= '--reap ';
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}
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$duration .= '--rttl ' if $command & $TTL_OPT;
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if ( $command & $RESET_CMD ) {
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require_capability 'MARK_ANYWHERE', '"reset"', 's';
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print "Resetting....\n";
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my $mark = $globals{EVENT_MARK};
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#
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# The event mark bit must be within 32 bits
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#
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fatal_error "The mark layout does not permit resetting of events" unless $mark & 0xffffffff;
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#
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# Reset the event mark bit
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#
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perl_action_helper( 'INLINE', '-j MARK --and-mark '. in_hex( (~ $mark ) & 0xffffffff ) );
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$mark = in_hex $mark;
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#
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# Mark the packet if event is armed
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#
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perl_action_helper( 'INLINE', "-m recent --rcheck ${duration}--hitcount $hitcount --name $event $srcdst -j MARK --or-mark $mark" );
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#
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# if the event is armed, remove it and perform the action
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#
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perl_action_helper( $action , "-m mark --mark $mark/$mark -m recent --remove --name $event" );
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} elsif ( $command & $UPDATE_CMD ) {
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perl_action_helper( $action, "-m recent --update ${duration}--hitcount $hitcount --name $event $srcdst" );
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} else {
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perl_action_helper( $action, "-m recent --rcheck ${duration}--hitcount $hitcount --name $event $srcdst" );
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}
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1;
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?end perl
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