/usr/share/perl5/EBox/Event/Watcher/Gateways.pm is in zentyal-network 2.3.13+quantal1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 | # Copyright (C) 2009-2012 eBox Technologies S.L.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
use strict;
use warnings;
package EBox::Event::Watcher::Gateways;
# Class: EBox::Event::Watcher::Gateways;
#
# This class is a watcher which checks connection/disconnection of gateways
#
use base 'EBox::Event::Watcher::Base';
use EBox::Network;
use EBox::Event;
use EBox::Global;
use EBox::Gettext;
use EBox::Validate;
use EBox::Exceptions::Lock;
use Error qw(:try);
# Group: Public methods
# Constructor: new
#
# The constructor for <EBox::Event::Watcher::Gateways>
#
# Overrides:
#
# <EBox::Event::Watcher::Base::new>
#
# Parameters:
#
# - non parameters
#
# Returns:
#
# <EBox::Event::Watcher::Gateways> - the newly created object
#
sub new
{
my ($class) = @_;
my $network = EBox::Global->getInstance(1)->modInstance('network');
my $options = $network->model('WANFailoverOptions')->row();
my $period = $options->valueByName('period');
my $self = $class->SUPER::new(period => $period);
$self->{counter} = 0;
bless ($self, $class);
return $self;
}
# Method: ConfigurationMethod
#
# Overrides:
#
# <EBox::Event::Component::ConfigurationMethod>
#
sub ConfigurationMethod
{
return 'none';
}
# Method: run
#
# Check state of the gateways.
#
# Overrides:
#
# <EBox::Event::Watcher::Base::run>
#
# Returns:
#
# array ref - <EBox::Event> an info event is sent if Zentyal is up and
# running and a fatal event if Zentyal is down
#
sub run
{
my ($self) = @_;
EBox::debug('Entering failover event...');
$self->{eventList} = [];
$self->{failed} = {};
# Getting readonly instance to test the gateways
my $global = EBox::Global->getInstance(1);
my $network = $global->modInstance('network');
return [] unless $network->isEnabled();
my $rules = $network->model('WANFailoverRules');
my $gateways = $network->model('GatewayTable');
$self->{gateways} = $gateways;
$self->{marks} = $network->marksForRouters();
my @enabledRules = @{$rules->enabledRows()};
# If we don't have any enabled rule we finish here
return [] unless @enabledRules;
foreach my $id (@enabledRules) {
EBox::debug("Testing rules for gateway with id $id...");
my $row = $rules->row($id);
$self->_testRule($row);
}
# We won't do anything if there are unsaved changes
my $readonly = EBox::Global->getInstance()->modIsChanged('network');
unless ($readonly) {
# Getting read/write instance to apply the changes
$network = EBox::Global->modInstance('network');
$gateways = $network->model('GatewayTable');
}
EBox::debug('Applying changes in the gateways table...');
my $needSave = 0;
foreach my $id (@{$gateways->ids()}) {
my $row = $gateways->row($id);
my $gwName = $row->valueByName('name');
my $enabled = $row->valueByName('enabled');
# It must be enabled if all tests are passed
my $enable = $enabled;
if (defined($self->{failed}->{$id})) {
$enable = not($self->{failed}->{$id})
};
EBox::debug("Properties for gateway $gwName ($id): enabled=$enabled, enable=$enable");
# We don't do anything if the previous state is the same
if ($enable xor $enabled) {
unless ($readonly) {
$row->elementByName('enabled')->setValue($enable);
$row->store();
$needSave = 1;
}
if ($enable) {
my $event = new EBox::Event(message => __x("Gateway {gw} connected again.", gw => $gwName),
level => 'info',
source => 'WAN Failover',
additional => { 'up' => 1, gateway => $gwName });
push (@{$self->{eventList}}, $event);
}
}
}
if ($readonly) {
EBox::warn('Leaving failover event without doing anything due to unsaved changes on the Zentyal interface.');
foreach my $event (@{$self->{eventList}}) {
$event->{message} = __('WARNING: These changes are not applied due to unsaved changes on the administration interface.') . "\n\n" . $event->{message};
}
return $self->{eventList};
}
my ($setAsDefault, $unsetAsDefault);
# Check if default gateway has been disabled and choose another
my $default = $gateways->findValue('default' => 1);
my $originalId = $network->selectedDefaultGateway();
EBox::debug("The preferred default gateway is $originalId");
unless ($default and $default->valueByName('enabled')) {
# If the original default gateway is alive, restore it
my $original;
$original = $gateways->row($originalId) if $originalId;
if ($original and $original->valueByName('enabled')) {
$original = $gateways->row($originalId);
$unsetAsDefault = $default;
$setAsDefault = $original;
EBox::debug('The original default gateway will be restored');
$needSave = 1;
} else {
EBox::debug('Checking if there is another enabled gateway to set as default');
# Check if we can find another enabled to set it as default
my $other = $gateways->findValue('enabled' => 1);
if ($other) {
$unsetAsDefault = $default;
$setAsDefault = $other;
}
}
} else {
# check if the gw enabled is the prefered one
if ($originalId and ($default->id() ne $originalId)) {
my $original = $gateways->row($originalId);
if ($original and $original->valueByName('enabled')) {
EBox::debug('The original default gateway will replace the current default');
$unsetAsDefault = $default;
$setAsDefault = $original;
}
}
}
if ($unsetAsDefault) {
$unsetAsDefault->elementByName('default')->setValue(0);
$unsetAsDefault->store();
EBox::debug("The gateway " . $unsetAsDefault->valueByName('name').
" is not longer default");
$needSave = 1;
}
if ($setAsDefault) {
$setAsDefault->elementByName('default')->setValue(1);
$setAsDefault->store();
EBox::debug("The gateway " . $setAsDefault->valueByName('name').
" is now the default");
$needSave = 1;
}
if ($needSave) {
EBox::debug('Regenerating rules for the gateways');
$network->regenGateways();
foreach my $module ($global->modInstancesOfType('EBox::NetworkObserver')) {
my $timeout = 60;
while ($timeout) {
try {
$module->regenGatewaysFailover();
last;
} catch EBox::Exceptions::Lock with {
sleep 5;
$timeout -= 5;
};
}
if ($timeout <= 0) {
EBox::error("WAN Failover: $module->{name} module has been locked for 60 seconds.");
}
}
} else {
EBox::debug('No need to regenerate the rules for the gateways');
}
EBox::debug('Leaving failover event...');
return $self->{eventList};
}
sub _testRule # (row)
{
my ($self, $row) = @_;
my $gw = $row->valueByName('gateway');
my $network = EBox::Global->modInstance('network');
my $gwName = $self->{gateways}->row($gw)->valueByName('name');
my $iface = $self->{gateways}->row($gw)->valueByName('interface');
my $wasEnabled = $self->{gateways}->row($gw)->valueByName('enabled');
EBox::debug("Entering _testRule for gateway $gwName...");
# First test on this gateway, initialize its entry on the hash
unless (exists $self->{failed}->{$gw}) {
$self->{failed}->{$gw} = 0;
}
# If a test for this gw has already failed we don't test any other
return if ($self->{failed}->{$gw});
my ($ppp_iface, $iface_up);
if ($network->ifaceMethod($iface) eq 'ppp') {
EBox::debug("It is a PPPoE gateway");
$ppp_iface = $network->realIface($iface);
$iface_up = !($ppp_iface eq $iface);
EBox::debug("Iface $ppp_iface up? = $iface_up");
if (!$iface_up) {
# PPP interface down, do not make test (not needed)
$self->{failed}->{$gw} = 1;
return;
}
}
my $type = $row->valueByName('type');
my $typeName = $row->printableValueByName('type');
my $host = $row->valueByName('host');
EBox::debug("Running $typeName tests for gateway $gwName...");
if ($type eq 'gw_ping') {
my $gwRow = $self->{gateways}->row($gw);
$host = $gwRow->valueByName('ip');
return unless $host;
}
my $probes = $row->valueByName('probes');
my $ratio = $row->valueByName('ratio') / 100;
my $neededSuccesses = $probes * $ratio;
my $maxFailRatio = 1 - $ratio;
my $maxFails = $probes * $maxFailRatio;
my $usedProbes = 0;
my $successes = 0;
my $fails = 0;
# Set rule for outgoing traffic through the gateway we are testing
$self->_setIptablesRule($gw, 1);
for (1..$probes) {
$usedProbes++;
if ($self->_runTest($type, $host)) {
EBox::debug("Probe number $_ succeded.");
$successes++;
last if ($successes >= $neededSuccesses);
} else {
EBox::debug("Probe number $_ failed.");
$fails++;
last if ($fails >= $maxFails);
}
}
# Clean rule
$self->_setIptablesRule($gw, 0);
my $failRatio = $fails / $usedProbes;
if ($failRatio >= $maxFailRatio) {
$self->{failed}->{$gw} = 1;
# Only generate event if gateway was not already disabled
return unless ($wasEnabled);
my $disconnectMsg = __x('Gateway {gw} disconnected', gw => $gwName);
my $reason =__x("'{type}' test to host '{host}' has failed {failRatio}%, max={maxFailRatio}%.",
failRatio => sprintf("%.2f", $failRatio*100),
type => $typeName, host => $host, maxFailRatio => $maxFailRatio*100);
my $explanation = __('This gateway will be connected again if the test are passed.');
my $event = new EBox::Event(message => "$disconnectMsg\n\n$reason\n$explanation",
level => 'error',
source => 'WAN Failover',
additional => { down => 1,
gateway => $gwName,
type => $type,
host => $host,
fail_ratio => $failRatio,
max_fail_ratio => $maxFailRatio,
}
);
push (@{$self->{eventList}}, $event);
}
}
sub _runTest # (type, host)
{
my ($self, $type, $host) = @_;
my $result;
if (($type eq 'gw_ping') or ($type eq 'host_ping')) {
$result = system("ping -W5 -c1 $host");
} elsif ($type eq 'dns') {
$result = system("host -W 5 $host");
} elsif ($type eq 'http') {
my $command = "wget $host --tries=1 -T 5 -O /dev/null";
$result = system($command);
}
return $result == 0;
}
sub _setIptablesRule # (gw, set)
{
my ($self, $gw, $set) = @_;
my $chain = EBox::Network::FAILOVER_CHAIN();
# Flush previous rules from custom chain. It'll fail silently
# if it doesn't exist
EBox::Sudo::silentRoot("/sbin/iptables -t mangle -F $chain");
if ($set) {
# We need to add a rule to return and do nothing
# when the traffic is generated by zentyal's apache
my $apachePort = EBox::Global->modInstance('apache')->port();
my $rule = "/sbin/iptables -t mangle -A $chain "
. "-p tcp --source-port $apachePort -j RETURN";
EBox::Sudo::root($rule);
# Add rule to mark packets generated by zentyal, i.e: failover tests
my $mark = $self->{marks}->{$gw};
$rule = "/sbin/iptables -t mangle -A $chain "
. "-m owner --gid-owner ebox -j MARK --set-mark $mark";
EBox::Sudo::root($rule);
}
}
# Group: Protected methods
# Method: _name
#
# Overrides:
#
# <EBox::Event::Watcher::Base::_name>
#
# Returns:
#
# String - the event watcher name
#
sub _name
{
return __('WAN Failover');
}
# Method: _description
#
# Overrides:
#
# <EBox::Event::Watcher::Base::_description>
#
# Returns:
#
# String - the event watcher detailed description
#
sub _description
{
return __('Check if gateways are connected or disconnected.');
}
1;
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