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1 | #!/usr/bin/perl |
2 | ############################################################################### | |
3 | # # | |
4 | # IPFire.org - A linux based firewall # | |
5 | # Copyright (C) 2015 IPFire Development Team # | |
6 | # # | |
7 | # This program is free software: you can redistribute it and/or modify # | |
8 | # it under the terms of the GNU General Public License as published by # | |
9 | # the Free Software Foundation, either version 3 of the License, or # | |
10 | # (at your option) any later version. # | |
11 | # # | |
12 | # This program is distributed in the hope that it will be useful, # | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
15 | # GNU General Public License for more details. # | |
16 | # # | |
17 | # You should have received a copy of the GNU General Public License # | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
19 | # # | |
20 | ############################################################################### | |
21 | ||
22 | use strict; | |
23 | use threads; | |
24 | use threads::shared; | |
45bf2a03 | 25 | use Getopt::Long; |
88d9af2c SS |
26 | use Thread::Queue; |
27 | use Linux::Inotify2; | |
01147a7e | 28 | use Time::HiRes qw[ time sleep ]; |
88d9af2c | 29 | |
3111df62 | 30 | require Guardian::Base; |
45bf2a03 | 31 | require Guardian::Config; |
88d9af2c | 32 | require Guardian::Parser; |
6abac3d4 | 33 | require Guardian::Socket; |
88d9af2c | 34 | |
5c694317 SS |
35 | use warnings; |
36 | ||
e02ed027 SS |
37 | # Disable warnings of unjoinded threads when stopping guardian. |
38 | no warnings 'threads'; | |
39 | ||
45bf2a03 SS |
40 | # Define version. |
41 | my $version ="2.0"; | |
42 | ||
45bf2a03 SS |
43 | # Get and store the given command line arguments in a hash. |
44 | my %cmdargs = (); | |
45 | ||
46 | &GetOptions (\%cmdargs, | |
47 | 'foreground|f', | |
48 | 'config|c=s', | |
49 | 'help|h', | |
50 | 'version|v', | |
51 | ); | |
52 | ||
53 | # Show help / version information. | |
54 | if (defined($cmdargs{"help"})) { | |
55 | print "Guardian $version \n"; | |
56 | print "Usage: guardian <optional arguments>\n"; | |
57 | print " -c, --config\t\tspecifiy a configuration file other than the default (/etc/guardian/guardian.conf)\n"; | |
58 | print " -f, --foreground\trun in the foreground (doesn't fork, any output goes to STDOUT)\n"; | |
59 | print " -h, --help\t\tshows this help\n"; | |
60 | print " -v, --version\t\tdisplay programm version and exit.\n"; | |
61 | exit; | |
62 | } elsif (defined($cmdargs{"version"})) { | |
63 | print "Guardian $version \n"; | |
64 | exit; | |
65 | } | |
66 | ||
67 | # Read-in the configuration file and store the settings. | |
68 | # Push the may be given config file argument. | |
69 | my %mainsettings = &Guardian::Config::UseConfig($cmdargs{"config"}); | |
70 | ||
3111df62 SS |
71 | # Shared hash between the main process and all threads. It will store all |
72 | # monitored files and their current file position. | |
73 | my %monitored_files :shared = (); | |
74 | ||
88d9af2c SS |
75 | # Create the main queue. It is used to store and process all events which are |
76 | # reported and enqueued by the worker threads. | |
77 | my $queue :shared = new Thread::Queue or die "Could not create new, empty queue. $!\n";; | |
78 | ||
9c74e9bb SS |
79 | # Array to store all currently running worker objects. |
80 | # (Does not include the socket thread) | |
81 | my @running_workers; | |
82 | ||
88d9af2c SS |
83 | # Call Init function to initzialize guardian. |
84 | &Init(); | |
85 | ||
86 | # Infinite main loop, which processes all queued events. | |
87 | while(1) { | |
88 | # Get the amount of elements in our queue. | |
89 | # "undef" will be returned if it is empty. | |
90 | my $current_events = $queue->pending(); | |
91 | ||
92 | # If there is at least one element enqued | |
93 | if($current_events > 0) { | |
94 | # Grab the data of the top enqueued event. | |
95 | my $event = $queue->peek(); | |
96 | ||
97 | print "Got event: $event\n"; | |
98 | ||
99 | # Drop processed event from queue. | |
100 | $queue->dequeue(); | |
101 | } | |
102 | ||
01147a7e SS |
103 | # Sleep 10ms to reduce the load of the main process. |
104 | sleep(0.01); | |
88d9af2c SS |
105 | } |
106 | ||
107 | # | |
108 | ## Init function. | |
109 | # | |
110 | ## This function contains code which has to be executed while guardian | |
111 | ## is starting. | |
112 | # | |
113 | sub Init () { | |
915d9f45 SS |
114 | # Setup signal handler. |
115 | &SignalHandler(); | |
116 | ||
6abac3d4 SS |
117 | # Setup IPC mechanism via Socket in an own thread. |
118 | threads->create(\&Socket); | |
119 | ||
3111df62 SS |
120 | # Generate hash of monitored files. |
121 | %monitored_files = &Guardian::Base::GenerateMonitoredFiles(\%mainsettings, \%monitored_files); | |
122 | ||
9c74e9bb SS |
123 | # Start worker threads. |
124 | &StartWorkers(); | |
88d9af2c SS |
125 | } |
126 | ||
127 | # | |
128 | ## Worker function. | |
129 | # | |
130 | ## This function is responsible for monitoring modifications of the given logfile, | |
131 | ## read them and pass them to the message parser. | |
132 | # | |
133 | ## To get file modifications the inotify subsystem of the linux kernel is used. | |
134 | # | |
135 | ## In order to prevent from permanently read and keep files opened, or dealing | |
136 | ## with huge logfiles, at initialization time of the worker process, the file will | |
137 | ## be opened once and the cursor position of the end of file (EOF) get stored. When | |
138 | ## reading any newly added lines from the file, we directly can jump to the last | |
139 | ## known position and get these lines. Afterwards, we store the current curser position | |
140 | ## again, so we can do it in this way over and over again. | |
141 | # | |
142 | ## All read lines get stored in an array, which will be passed to the Parser. | |
143 | # | |
144 | ## If any response (action) from the parser get recieved, it will be put into the | |
145 | ## shared event queue. | |
146 | # | |
147 | sub Worker ($) { | |
9c74e9bb SS |
148 | my $file = $_[0]; |
149 | ||
150 | # Signal handler to kill worker. | |
151 | $SIG{'KILL'} = sub { threads->exit(); }; | |
88d9af2c | 152 | |
88d9af2c SS |
153 | # Create inotify watcher. |
154 | my $watcher = new Linux::Inotify2 or die "Could not use inotify. $!\n"; | |
155 | ||
156 | # Monitor the specified file. | |
157 | $watcher->watch("$file", IN_MODIFY) or die "Could not monitor $file. $!\n"; | |
158 | ||
9c74e9bb SS |
159 | # Switch watcher into non-blocking mode. |
160 | $watcher->blocking(0); | |
88d9af2c | 161 | |
9c74e9bb SS |
162 | # Infinite loop. |
163 | while(1) { | |
164 | # Check for any events and perform them, if there | |
165 | # is a least one. | |
166 | if ($watcher->read) { | |
167 | my @message = (); | |
88d9af2c | 168 | |
3111df62 SS |
169 | # Obtain fileposition from hash. |
170 | my $fileposition = $monitored_files{$file}; | |
171 | ||
9c74e9bb SS |
172 | # Open the file. |
173 | open (FILE, $file) or die "Could not open $file. $!\n"; | |
88d9af2c | 174 | |
9c74e9bb SS |
175 | # Seek to the last known position. |
176 | seek (FILE, $fileposition, 0); | |
88d9af2c | 177 | |
9c74e9bb SS |
178 | # Get the log message. |
179 | while (my $line = <FILE>) { | |
180 | # Remove any newlines. | |
181 | chomp $line; | |
88d9af2c | 182 | |
9c74e9bb SS |
183 | # Add all lines to the message array. |
184 | push (@message, $line); | |
185 | } | |
88d9af2c | 186 | |
3111df62 SS |
187 | { |
188 | # Lock shared hash. | |
189 | lock(%monitored_files); | |
190 | ||
191 | # Update fileposition. | |
192 | $monitored_files{$file} = tell(FILE); | |
193 | } | |
88d9af2c | 194 | |
9c74e9bb SS |
195 | # Close file. |
196 | close(FILE); | |
88d9af2c | 197 | |
9c74e9bb SS |
198 | # Send filename and message to the parser, |
199 | # which will return if an action has to be performed. | |
200 | my @action = &Guardian::Parser::Parser("$file", @message); | |
88d9af2c | 201 | |
9c74e9bb SS |
202 | # Send the action to the main process and put it into |
203 | # the queue. | |
204 | if (@action) { | |
205 | # Lock the queue. | |
206 | lock($queue); | |
207 | ||
208 | # Put the required action into the queue. | |
209 | $queue->enqueue(@action); | |
210 | } | |
211 | } else { | |
212 | # Sleep for 10ms until the next round of the loop will start. | |
213 | sleep(0.01); | |
88d9af2c SS |
214 | } |
215 | } | |
216 | } | |
217 | ||
6abac3d4 SS |
218 | # |
219 | ## Socket function. | |
220 | # | |
221 | ## This function uses the Socket module to create and listen to an UNIX socket. | |
222 | ## It automatically accepts all incomming connections and pass the recieved | |
223 | ## data messages to the the Message_Parser function which is also part of the | |
224 | ## socket module. | |
225 | # | |
226 | ## If a valid command has been sent through the socket, the corresponding event | |
227 | ## will be enqueued into the shared event queue. | |
228 | # | |
229 | sub Socket () { | |
230 | # Create the Server socket by calling the responsible function. | |
231 | my $server = &Guardian::Socket::Server(); | |
232 | ||
233 | # Accept incomming connections from the socket. | |
234 | while (my $connection = $server->accept()) { | |
235 | # Autoflush the socket after the data | |
236 | # has been recieved. | |
237 | $connection->autoflush(1); | |
238 | ||
239 | # Gather all data from the connection. | |
240 | while (my $message = <$connection>) { | |
241 | # Remove any newlines. | |
242 | chomp($message); | |
243 | ||
244 | # Send the recieved data message to the | |
245 | # socket parser. | |
246 | my $action = &Guardian::Socket::Message_Parser($message); | |
247 | ||
248 | # If the parser returns to perform an action, | |
249 | # add it to the main event queue. | |
250 | if ($action) { | |
251 | # Lock the queue. | |
252 | lock($queue); | |
253 | ||
254 | # Enqueue the returned action. | |
255 | $queue->enqueue($action); | |
256 | } | |
257 | } | |
258 | } | |
259 | } | |
260 | ||
915d9f45 SS |
261 | # |
262 | ## Function for capturing process signals. | |
263 | # | |
264 | ## This function captures any sent process signals and will call various | |
265 | ## actions, basend on the captured signal. | |
266 | # | |
267 | sub SignalHandler { | |
268 | $SIG{INT} = \&Shutdown; | |
269 | $SIG{TERM} = \&Shutdown; | |
270 | $SIG{QUIT} = \&Shutdown; | |
ba734c53 | 271 | $SIG{HUP} = \&Reload; |
915d9f45 SS |
272 | } |
273 | ||
9c74e9bb SS |
274 | # |
275 | ## Function to start the workers (threads) for all monitored files. | |
276 | # | |
3111df62 | 277 | ## This function will loop through the hash of monitored files and will |
9c74e9bb SS |
278 | ## spawn an own thread based worker for each file. Every created worker will |
279 | ## be added to the array of running workers. | |
280 | # | |
281 | sub StartWorkers () { | |
3111df62 SS |
282 | # Loop through the hash which contains the monitored files and start |
283 | # a worker thread for each single one. | |
284 | foreach my $file (keys %monitored_files) { | |
285 | # Create worker thread for the file. | |
286 | push @running_workers, threads->create(\&Worker,$file); | |
9c74e9bb SS |
287 | } |
288 | } | |
289 | ||
290 | # | |
291 | ## Function to stop all running workers. | |
292 | # | |
293 | ## This function is used to stop all currently running workers and will be | |
294 | ## called when reloading or shutting down guardian. | |
295 | # | |
296 | sub StopWorkers () { | |
297 | # Loop through all running workers. | |
298 | foreach my $worker (@running_workers) { | |
299 | # Send the worker the "KILL" signal and detach the | |
300 | # thread so perl can do an automatically clean-up. | |
4d19939e | 301 | $worker->kill('KILL'); |
9c74e9bb SS |
302 | } |
303 | } | |
304 | ||
ba734c53 SS |
305 | # |
306 | ## Reload function. | |
307 | # | |
308 | ## This function will get called if the signal handler recieves a "SIGHUP" signal, | |
309 | ## or the reload command will be sent via socket connection. It is responsible for | |
310 | ## reloading all configure options and stopping/starting the worker threads. | |
311 | # | |
312 | sub Reload () { | |
313 | # Stop all running workers. | |
314 | &StopWorkers(); | |
315 | ||
316 | # Re-read configuration file. | |
317 | %mainsettings = &Guardian::Config::UseConfig($cmdargs{"config"}); | |
318 | ||
319 | # Re-generate hash of monitored files. | |
320 | %monitored_files = &Guardian::Base::GenerateMonitoredFiles(\%mainsettings, \%monitored_files); | |
321 | ||
322 | # Restart the worker threads. | |
323 | &StartWorkers(); | |
324 | } | |
325 | ||
915d9f45 SS |
326 | # |
327 | ## Shutdown function. | |
328 | # | |
329 | ## This function is used to do a clean shutdown of guardian. It will be called | |
330 | ## by the signal handler when recieving INT (2), QUIT (3) and TERM (15) signals. | |
331 | # | |
332 | sub Shutdown () { | |
9c74e9bb SS |
333 | # Stop all workers. |
334 | &StopWorkers(); | |
335 | ||
915d9f45 SS |
336 | # Remove socket file on exit. |
337 | &Guardian::Socket::RemoveSocketFile(); | |
338 | ||
a9ef502c SS |
339 | # Sleep for one second to give perl some |
340 | # time to proper clean up everything before | |
341 | # exiting. | |
342 | sleep(1); | |
343 | ||
915d9f45 SS |
344 | # Exit guardian. |
345 | exit; | |
346 | } |