use Linux::Inotify2;
use Time::HiRes qw[ time sleep ];
+require Guardian::Base;
require Guardian::Config;
+require Guardian::Logger;
require Guardian::Parser;
require Guardian::Socket;
use warnings;
+# Disable warnings of unjoinded threads when stopping guardian.
+no warnings 'threads';
+
# Define version.
my $version ="2.0";
-# Array to store the monitored logfiles.
-my @monitored_files = (
- "/var/log/snort/alert",
-);
-
# Get and store the given command line arguments in a hash.
my %cmdargs = ();
# Push the may be given config file argument.
my %mainsettings = &Guardian::Config::UseConfig($cmdargs{"config"});
+# Initialize Logger.
+my $logger = Guardian::Logger->New(%mainsettings);
+$logger->Log("debug", "Logger successfully initialized...");
+
+# Shared hash between the main process and all threads. It will store all
+# monitored files and their current file position.
+my %monitored_files :shared = ();
+
# Create the main queue. It is used to store and process all events which are
# reported and enqueued by the worker threads.
my $queue :shared = new Thread::Queue or die "Could not create new, empty queue. $!\n";;
# Grab the data of the top enqueued event.
my $event = $queue->peek();
- print "Got event: $event\n";
+ # Log processed event.
+ $logger->Log("debug", "QUEUE - Processed event: $event");
# Drop processed event from queue.
$queue->dequeue();
# Setup IPC mechanism via Socket in an own thread.
threads->create(\&Socket);
+ # Generate hash of monitored files.
+ %monitored_files = &Guardian::Base::GenerateMonitoredFiles(\%mainsettings, \%monitored_files);
+
# Start worker threads.
&StartWorkers();
}
# Signal handler to kill worker.
$SIG{'KILL'} = sub { threads->exit(); };
- # Get the fileposition.
- my $fileposition = &Init_fileposition("$file");
-
# Create inotify watcher.
my $watcher = new Linux::Inotify2 or die "Could not use inotify. $!\n";
# Switch watcher into non-blocking mode.
$watcher->blocking(0);
+ # Log successfully spawned worker.
+ $logger->Log("debug", "Spawned worker thread for: $file");
+
# Infinite loop.
while(1) {
# Check for any events and perform them, if there
if ($watcher->read) {
my @message = ();
+ # Obtain fileposition from hash.
+ my $fileposition = $monitored_files{$file};
+
# Open the file.
open (FILE, $file) or die "Could not open $file. $!\n";
push (@message, $line);
}
- # Update fileposition.
- $fileposition = tell(FILE);
+ {
+ # Lock shared hash.
+ lock(%monitored_files);
+
+ # Update fileposition.
+ $monitored_files{$file} = tell(FILE);
+ }
# Close file.
close(FILE);
# Create the Server socket by calling the responsible function.
my $server = &Guardian::Socket::Server();
+ # Log successfull creation of socket.
+ $logger->Log("debug", "Listening to Socket...");
+
# Accept incomming connections from the socket.
while (my $connection = $server->accept()) {
# Autoflush the socket after the data
# Remove any newlines.
chomp($message);
+ # Log recieved socket command.
+ $logger->Log("debug", "Socket - Recieved message: $message");
+
# Send the recieved data message to the
# socket parser.
my $action = &Guardian::Socket::Message_Parser($message);
$SIG{INT} = \&Shutdown;
$SIG{TERM} = \&Shutdown;
$SIG{QUIT} = \&Shutdown;
+ $SIG{HUP} = \&Reload;
}
#
## Function to start the workers (threads) for all monitored files.
#
-## This function will loop through the array of monitored files and will
+## This function will loop through the hash of monitored files and will
## spawn an own thread based worker for each file. Every created worker will
## be added to the array of running workers.
#
sub StartWorkers () {
- # Loop through the array of which files should be monitored and
- # create a worker thread for each single one.
- foreach my $monitored_file (@monitored_files) {
- # Check if the file exists and is readable.
- if (-r "$monitored_file") {
- # Create worker thread for the file.
- push @running_workers, threads->create(\&Worker,$monitored_file);
- }
+ # Loop through the hash which contains the monitored files and start
+ # a worker thread for each single one.
+ foreach my $file (keys %monitored_files) {
+ $logger->Log("debug", "Starting worker thread for $file");
+ # Create worker thread for the file.
+ push @running_workers, threads->create(\&Worker,$file);
}
}
foreach my $worker (@running_workers) {
# Send the worker the "KILL" signal and detach the
# thread so perl can do an automatically clean-up.
- $worker->kill('KILL')->detach();
+ $worker->kill('KILL');
}
+ $logger->Log("debug", "All workers are stopped now...");
+}
+
+#
+## Reload function.
+#
+## This function will get called if the signal handler recieves a "SIGHUP" signal,
+## or the reload command will be sent via socket connection. It is responsible for
+## reloading all configure options and stopping/starting the worker threads.
+#
+sub Reload () {
+ # Log reload.
+ $logger->Log("info", "Reload configuration...");
+
+ # Stop all running workers.
+ &StopWorkers();
+
+ # Re-read configuration file.
+ %mainsettings = &Guardian::Config::UseConfig($cmdargs{"config"});
+
+ # Re-generate hash of monitored files.
+ %monitored_files = &Guardian::Base::GenerateMonitoredFiles(\%mainsettings, \%monitored_files);
+
+ # Restart the worker threads.
+ &StartWorkers();
}
#
## by the signal handler when recieving INT (2), QUIT (3) and TERM (15) signals.
#
sub Shutdown () {
+ # Log shutdown.
+ $logger->Log("info", "Shutting down...");
+
# Stop all workers.
&StopWorkers();
# Remove socket file on exit.
&Guardian::Socket::RemoveSocketFile();
+ # Sleep for one second to give perl some
+ # time to proper clean up everything before
+ # exiting.
+ sleep(1);
+
+ # Log good bye message.
+ $logger->Log("debug", "Good Bye!");
+
# Exit guardian.
exit;
}
projects / people / stevee / guardian.git / blobdiff