[pve-devel] [PATCH v4 firewall 02/13] prepare code for more generic firewall logging
Tom Weber
pve at junkyard.4t2.com
Wed Oct 18 22:23:59 CEST 2017
making ruleset generation aware of a match and action
part in iptable rules.
code will generate the same iptables as before! (except for
a few additional spaces between match and action).
Signed-off-by: Tom Weber <pve at junkyard.4t2.com>
---
src/PVE/Firewall.pm | 166 ++++++++++++++++++++++++++-----------------
src/PVE/FirewallSimulator.pm | 2 +-
2 files changed, 100 insertions(+), 68 deletions(-)
diff --git a/src/PVE/Firewall.pm b/src/PVE/Firewall.pm
index 5d78686..f1aecef 100644
--- a/src/PVE/Firewall.pm
+++ b/src/PVE/Firewall.pm
@@ -1776,7 +1776,7 @@ sub ipset_get_chains {
return $res;
}
-sub ruleset_generate_cmdstr {
+sub ruleset_generate_match {
my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
return if defined($rule->{enable}) && !$rule->{enable};
@@ -1907,6 +1907,14 @@ sub ruleset_generate_cmdstr {
push @cmd, "-m addrtype --dst-type $rule->{dsttype}" if $rule->{dsttype};
+ return scalar(@cmd) ? join(' ', @cmd) : undef;
+}
+
+sub ruleset_generate_action {
+ my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
+
+ my @cmd = ();
+
if (my $action = $rule->{action}) {
$action = $actions->{$action} if defined($actions->{$action});
$goto = 1 if !defined($goto) && $action eq 'PVEFW-SET-ACCEPT-MARK';
@@ -1916,6 +1924,17 @@ sub ruleset_generate_cmdstr {
return scalar(@cmd) ? join(' ', @cmd) : undef;
}
+sub ruleset_generate_cmdstr {
+ my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
+ my $match = ruleset_generate_match($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf);
+ my $action = ruleset_generate_action($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf);
+
+ return undef if !(defined($match) or defined($action));
+ my $ret = defined($match) ? $match : "";
+ $ret = "$ret $action" if defined($action);
+ return $ret;
+}
+
sub ruleset_generate_rule {
my ($ruleset, $chain, $ipversion, $rule, $actions, $goto, $cluster_conf, $fw_conf) = @_;
@@ -1929,15 +1948,19 @@ sub ruleset_generate_rule {
# update all or nothing
- my @cmds = ();
+ my @mstrs = ();
+ my @astrs = ();
foreach my $tmp (@$rules) {
- if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $ipversion, $tmp, $actions, $goto, $cluster_conf, $fw_conf)) {
- push @cmds, $cmdstr;
+ my $m = ruleset_generate_match($ruleset, $chain, $ipversion, $tmp, $actions, $goto, $cluster_conf, $fw_conf);
+ my $a = ruleset_generate_action($ruleset, $chain, $ipversion, $tmp, $actions, $goto, $cluster_conf, $fw_conf);
+ if (defined $m or defined $a) {
+ push @mstrs, defined($m) ? $m : "";
+ push @astrs, defined($a) ? $a : "";
}
}
- foreach my $cmdstr (@cmds) {
- ruleset_addrule($ruleset, $chain, $cmdstr);
+ for my $i (0 .. $#mstrs) {
+ ruleset_addrule($ruleset, $chain, $mstrs[$i], $astrs[$i]);
}
}
@@ -1946,8 +1969,10 @@ sub ruleset_generate_rule_insert {
die "implement me" if $rule->{macro}; # not implemented, because not needed so far
- if (my $cmdstr = ruleset_generate_cmdstr($ruleset, $chain, $ipversion, $rule, $actions, $goto)) {
- ruleset_insertrule($ruleset, $chain, $cmdstr);
+ my $match = ruleset_generate_match($ruleset, $chain, $ipversion, $rule, $actions, $goto);
+ my $action = ruleset_generate_action($ruleset, $chain, $ipversion, $rule, $actions, $goto);
+ if (defined $match && defined $action) {
+ ruleset_insertrule($ruleset, $chain, $match, $action);
}
}
@@ -1968,7 +1993,7 @@ sub ruleset_chain_exist {
return $ruleset->{$chain} ? 1 : undef;
}
-sub ruleset_addrule {
+sub ruleset_addrule_old {
my ($ruleset, $chain, $rule) = @_;
die "no such chain '$chain'\n" if !$ruleset->{$chain};
@@ -1976,12 +2001,20 @@ sub ruleset_addrule {
push @{$ruleset->{$chain}}, "-A $chain $rule";
}
+sub ruleset_addrule {
+ my ($ruleset, $chain, $match, $action, $log) = @_;
+
+ die "no such chain '$chain'\n" if !$ruleset->{$chain};
+
+ push @{$ruleset->{$chain}}, "-A $chain $match $action";
+}
+
sub ruleset_insertrule {
- my ($ruleset, $chain, $rule) = @_;
+ my ($ruleset, $chain, $match, $action, $log) = @_;
die "no such chain '$chain'\n" if !$ruleset->{$chain};
- unshift @{$ruleset->{$chain}}, "-A $chain $rule";
+ unshift @{$ruleset->{$chain}}, "-A $chain $match $action";
}
sub get_log_rule_base {
@@ -1998,15 +2031,14 @@ sub get_log_rule_base {
}
sub ruleset_addlog {
- my ($ruleset, $chain, $vmid, $msg, $loglevel, $rule) = @_;
+ my ($ruleset, $chain, $vmid, $msg, $loglevel, $match) = @_;
return if !defined($loglevel);
- my $logrule = get_log_rule_base($chain, $vmid, $msg, $loglevel);
-
- $logrule = "$rule $logrule" if defined($rule);
+ my $logaction = get_log_rule_base($chain, $vmid, $msg, $loglevel);
- ruleset_addrule($ruleset, $chain, $logrule);
+ $match = "" if !defined $match;
+ ruleset_addrule($ruleset, $chain, $match, $logaction);
}
sub ruleset_add_chain_policy {
@@ -2019,17 +2051,17 @@ sub ruleset_add_chain_policy {
} elsif ($policy eq 'DROP') {
- ruleset_addrule($ruleset, $chain, "-j PVEFW-Drop");
+ ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Drop");
ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
- ruleset_addrule($ruleset, $chain, "-j DROP");
+ ruleset_addrule($ruleset, $chain, "", "-j DROP");
} elsif ($policy eq 'REJECT') {
- ruleset_addrule($ruleset, $chain, "-j PVEFW-Reject");
+ ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Reject");
ruleset_addlog($ruleset, $chain, $vmid, "policy $policy: ", $loglevel);
- ruleset_addrule($ruleset, $chain, "-g PVEFW-reject");
+ ruleset_addrule($ruleset, $chain, "", "-g PVEFW-reject");
} else {
# should not happen
die "internal error: unknown policy '$policy'";
@@ -2040,19 +2072,19 @@ sub ruleset_chain_add_ndp {
my ($ruleset, $chain, $ipversion, $options, $direction, $accept) = @_;
return if $ipversion != 6 || (defined($options->{ndp}) && !$options->{ndp});
- ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-solicitation $accept");
+ ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-solicitation", $accept);
if ($direction ne 'OUT' || $options->{radv}) {
- ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement $accept");
+ ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", $accept);
}
- ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-solicitation $accept");
- ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-advertisement $accept");
+ ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-solicitation", $accept);
+ ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type neighbor-advertisement", $accept);
}
sub ruleset_chain_add_conn_filters {
my ($ruleset, $chain, $accept) = @_;
- ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID -j DROP");
- ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED -j $accept");
+ ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID", "-j DROP");
+ ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED", "-j $accept");
}
sub ruleset_chain_add_input_filters {
@@ -2062,20 +2094,20 @@ sub ruleset_chain_add_input_filters {
if (!ruleset_chain_exist($ruleset, "PVEFW-blacklist")) {
ruleset_create_chain($ruleset, "PVEFW-blacklist");
ruleset_addlog($ruleset, "PVEFW-blacklist", 0, "DROP: ", $loglevel) if $loglevel;
- ruleset_addrule($ruleset, "PVEFW-blacklist", "-j DROP");
+ ruleset_addrule($ruleset, "PVEFW-blacklist", "", "-j DROP");
}
my $ipset_chain = compute_ipset_chain_name(0, 'blacklist', $ipversion);
- ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src -j PVEFW-blacklist");
+ ruleset_addrule($ruleset, $chain, "-m set --match-set ${ipset_chain} src", "-j PVEFW-blacklist");
}
if (!(defined($options->{nosmurfs}) && $options->{nosmurfs} == 0)) {
if ($ipversion == 4) {
- ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW -j PVEFW-smurfs");
+ ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID,NEW", "-j PVEFW-smurfs");
}
}
if ($options->{tcpflags}) {
- ruleset_addrule($ruleset, $chain, "-p tcp -j PVEFW-tcpflags");
+ ruleset_addrule($ruleset, $chain, "-p tcp", "-j PVEFW-tcpflags");
}
}
@@ -2112,15 +2144,15 @@ sub ruleset_create_vm_chain {
if ($direction eq 'OUT') {
if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
- ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr -j DROP");
+ ruleset_addrule($ruleset, $chain, "-m mac ! --mac-source $macaddr", "-j DROP");
}
if ($ipversion == 6 && !$options->{radv}) {
- ruleset_addrule($ruleset, $chain, '-p icmpv6 --icmpv6-type router-advertisement -j DROP');
+ ruleset_addrule($ruleset, $chain, "-p icmpv6 --icmpv6-type router-advertisement", "-j DROP");
}
if ($ipfilter_ipset) {
- ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src -j DROP");
+ ruleset_addrule($ruleset, $chain, "-m set ! --match-set $ipfilter_ipset src", "-j DROP");
}
- ruleset_addrule($ruleset, $chain, "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
+ ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
}
my $accept_action = $direction eq 'OUT' ? '-g PVEFW-SET-ACCEPT-MARK' : "-j $accept";
@@ -2137,14 +2169,14 @@ sub ruleset_add_group_rule {
}
if ($direction eq 'OUT' && $rule->{iface_out}) {
- ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out} -j $group_chain");
+ ruleset_addrule($ruleset, $chain, "-o $rule->{iface_out}", "-j $group_chain");
} elsif ($direction eq 'IN' && $rule->{iface_in}) {
- ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in} -j $group_chain");
+ ruleset_addrule($ruleset, $chain, "-i $rule->{iface_in}", "-j $group_chain");
} else {
- ruleset_addrule($ruleset, $chain, "-j $group_chain");
+ ruleset_addrule($ruleset, $chain, "", "-j $group_chain");
}
- ruleset_addrule($ruleset, $chain, "-m mark --mark $FWACCEPTMARK_ON -j $action");
+ ruleset_addrule($ruleset, $chain, "-m mark --mark $FWACCEPTMARK_ON", "-j $action");
}
sub ruleset_generate_vm_rules {
@@ -2209,7 +2241,7 @@ sub ruleset_generate_vm_ipsrules {
ruleset_create_chain($ruleset, "PVEFW-IPS");
}
- ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged -j $nfqueue");
+ ruleset_addrule($ruleset, "PVEFW-IPS", "-m physdev --physdev-out $iface --physdev-is-bridged", "-j $nfqueue");
}
}
@@ -2257,10 +2289,10 @@ sub generate_tap_rules_direction {
# plug the tap chain to bridge chain
if ($direction eq 'IN') {
ruleset_addrule($ruleset, "PVEFW-FWBR-IN",
- "-m physdev --physdev-is-bridged --physdev-out $iface -j $tapchain");
+ "-m physdev --physdev-is-bridged --physdev-out $iface", "-j $tapchain");
} else {
ruleset_addrule($ruleset, "PVEFW-FWBR-OUT",
- "-m physdev --physdev-is-bridged --physdev-in $iface -j $tapchain");
+ "-m physdev --physdev-is-bridged --physdev-in $iface", "-j $tapchain");
}
}
@@ -2278,7 +2310,7 @@ sub enable_host_firewall {
my $loglevel = get_option_log_level($options, "log_level_in");
- ruleset_addrule($ruleset, $chain, "-i lo -j ACCEPT");
+ ruleset_addrule($ruleset, $chain, "-i lo", "-j ACCEPT");
ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'IN', '-j RETURN');
@@ -2287,7 +2319,7 @@ sub enable_host_firewall {
# we use RETURN because we need to check also tap rules
my $accept_action = 'RETURN';
- ruleset_addrule($ruleset, $chain, "-p igmp -j $accept_action"); # important for multicast
+ ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
# add host rules first, so that cluster wide rules can be overwritten
foreach my $rule (@$rules, @$cluster_rules) {
@@ -2312,19 +2344,19 @@ sub enable_host_firewall {
# allow standard traffic for management ipset (includes cluster network)
my $mngmnt_ipset_chain = compute_ipset_chain_name(0, "management", $ipversion);
my $mngmntsrc = "-m set --match-set ${mngmnt_ipset_chain} src";
- ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006 -j $accept_action"); # PVE API
- ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999 -j $accept_action"); # PVE VNC Console
- ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128 -j $accept_action"); # SPICE Proxy
- ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22 -j $accept_action"); # SSH
+ ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 8006", "-j $accept_action"); # PVE API
+ ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 5900:5999", "-j $accept_action"); # PVE VNC Console
+ ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 3128", "-j $accept_action"); # SPICE Proxy
+ ruleset_addrule($ruleset, $chain, "$mngmntsrc -p tcp --dport 22", "-j $accept_action"); # SSH
my $localnet = $cluster_conf->{aliases}->{local_network}->{cidr};
my $localnet_ver = $cluster_conf->{aliases}->{local_network}->{ipversion};
# corosync
if ($localnet && ($ipversion == $localnet_ver)) {
- my $corosync_rule = "-p udp --dport 5404:5405 -j $accept_action";
- ruleset_addrule($ruleset, $chain, "-s $localnet -d $localnet $corosync_rule");
- ruleset_addrule($ruleset, $chain, "-s $localnet -m addrtype --dst-type MULTICAST $corosync_rule");
+ my $corosync_rule = "-p udp --dport 5404:5405";
+ ruleset_addrule($ruleset, $chain, "-s $localnet -d $localnet $corosync_rule", "-j $accept_action");
+ ruleset_addrule($ruleset, $chain, "-s $localnet -m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action");
}
# implement input policy
@@ -2337,7 +2369,7 @@ sub enable_host_firewall {
$loglevel = get_option_log_level($options, "log_level_out");
- ruleset_addrule($ruleset, $chain, "-o lo -j ACCEPT");
+ ruleset_addrule($ruleset, $chain, "-o lo", "-j ACCEPT");
ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
@@ -2345,7 +2377,7 @@ sub enable_host_firewall {
$accept_action = 'RETURN';
ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'OUT', "-j $accept_action");
- ruleset_addrule($ruleset, $chain, "-p igmp -j $accept_action"); # important for multicast
+ ruleset_addrule($ruleset, $chain, "-p igmp", "-j $accept_action"); # important for multicast
# add host rules first, so that cluster wide rules can be overwritten
foreach my $rule (@$rules, @$cluster_rules) {
@@ -2368,22 +2400,22 @@ sub enable_host_firewall {
# allow standard traffic on cluster network
if ($localnet && ($ipversion == $localnet_ver)) {
- ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006 -j $accept_action"); # PVE API
- ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22 -j $accept_action"); # SSH
- ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999 -j $accept_action"); # PVE VNC Console
- ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128 -j $accept_action"); # SPICE Proxy
+ ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 8006", "-j $accept_action"); # PVE API
+ ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 22", "-j $accept_action"); # SSH
+ ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 5900:5999", "-j $accept_action"); # PVE VNC Console
+ ruleset_addrule($ruleset, $chain, "-d $localnet -p tcp --dport 3128", "-j $accept_action"); # SPICE Proxy
- my $corosync_rule = "-p udp --dport 5404:5405 -j $accept_action";
- ruleset_addrule($ruleset, $chain, "-d $localnet $corosync_rule");
- ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule");
+ my $corosync_rule = "-p udp --dport 5404:5405";
+ ruleset_addrule($ruleset, $chain, "-d $localnet $corosync_rule", "-j $accept_action");
+ ruleset_addrule($ruleset, $chain, "-m addrtype --dst-type MULTICAST $corosync_rule", "-j $accept_action");
}
# implement output policy
$policy = $cluster_options->{policy_out} || 'ACCEPT'; # allow everything by default
ruleset_add_chain_policy($ruleset, $chain, $ipversion, 0, $policy, $loglevel, $accept_action);
- ruleset_addrule($ruleset, "PVEFW-OUTPUT", "-j PVEFW-HOST-OUT");
- ruleset_addrule($ruleset, "PVEFW-INPUT", "-j PVEFW-HOST-IN");
+ ruleset_addrule($ruleset, "PVEFW-OUTPUT", "", "-j PVEFW-HOST-OUT");
+ ruleset_addrule($ruleset, "PVEFW-INPUT", "", "-j PVEFW-HOST-IN");
}
sub generate_group_rules {
@@ -2399,7 +2431,7 @@ sub generate_group_rules {
my $chain = "GROUP-${group}-IN";
ruleset_create_chain($ruleset, $chain);
- ruleset_addrule($ruleset, $chain, "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
+ ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
foreach my $rule (@$rules) {
next if $rule->{type} ne 'in';
@@ -2412,7 +2444,7 @@ sub generate_group_rules {
$chain = "GROUP-${group}-OUT";
ruleset_create_chain($ruleset, $chain);
- ruleset_addrule($ruleset, $chain, "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
+ ruleset_addrule($ruleset, $chain, "", "-j MARK --set-mark $FWACCEPTMARK_OFF"); # clear mark
foreach my $rule (@$rules) {
next if $rule->{type} ne 'out';
@@ -3135,7 +3167,7 @@ sub generate_std_chains {
if (ref($rule)) {
ruleset_generate_rule($ruleset, $chain, $ipversion, $rule);
} else {
- ruleset_addrule($ruleset, $chain, $rule);
+ ruleset_addrule_old($ruleset, $chain, $rule);
}
}
}
@@ -3378,10 +3410,10 @@ sub compile_iptables_filter {
ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
- ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+ -j PVEFW-FWBR-IN");
+ ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-in fwln+", "-j PVEFW-FWBR-IN");
ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
- ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+ -j PVEFW-FWBR-OUT");
+ ruleset_addrule($ruleset, "PVEFW-FORWARD", "-m physdev --physdev-is-bridged --physdev-out fwln+", "-j PVEFW-FWBR-OUT");
generate_std_chains($ruleset, $hostfw_options, $ipversion);
@@ -3440,7 +3472,7 @@ sub compile_iptables_filter {
}
if(ruleset_chain_exist($ruleset, "PVEFW-IPS")){
- ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED -j PVEFW-IPS");
+ ruleset_insertrule($ruleset, "PVEFW-FORWARD", "-m conntrack --ctstate RELATED,ESTABLISHED", "-j PVEFW-IPS");
}
return $ruleset;
diff --git a/src/PVE/FirewallSimulator.pm b/src/PVE/FirewallSimulator.pm
index f2c2fbc..b01e45b 100644
--- a/src/PVE/FirewallSimulator.pm
+++ b/src/PVE/FirewallSimulator.pm
@@ -111,7 +111,7 @@ sub ipset_match {
sub rule_match {
my ($ipset_ruleset, $chain, $rule, $pkg) = @_;
- $rule =~ s/^-A $chain // || die "got strange rule: $rule";
+ $rule =~ s/^-A $chain +// || die "got strange rule: $rule";
while (length($rule)) {
--
2.7.4
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