2 The software in this package is distributed under the GNU General
3 Public License version 2 (with a special exception described below).
5 A copy of GNU General Public License (GPL) is included in this distribution,
6 in the file COPYING.GPL.
8 As a special exception, if other files instantiate templates or use macros
9 or inline functions from this file, or you compile this file and link it
10 with other works to produce a work based on this file, this file
11 does not by itself cause the resulting work to be covered
12 by the GNU General Public License.
14 However the source code for this file must still be made available
15 in accordance with section (3) of the GNU General Public License.
17 This exception does not invalidate any other reasons why a work based
18 on this file might be covered by the GNU General Public License.
26 #include <boost/asio.hpp>
27 #include <boost/foreach.hpp>
28 #include <boost/shared_ptr.hpp>
29 #include <boost/math/special_functions/round.hpp>
30 #include <boost/numeric/conversion/cast.hpp>
31 #include <boost/date_time/posix_time/posix_time_types.hpp>
33 #include <daemonfunc.hpp>
34 #include <logfunc.hpp>
36 #include "boost_assert_handler.h"
37 #include "config/configurationreader.h"
38 #include "config/host.h"
39 #include "link/linkstatus.h"
40 #include "host/loglevel.h"
41 #include "host/pingprotocol.h"
42 #include "host/pingscheduler.h"
43 #include "icmp/icmppinger.h" // contains IcmpPacketDistributor
44 #include "dns/dnsmaster.h"
48 using boost::shared_ptr;
49 using boost::posix_time::time_duration;
50 using I2n::Logger::GlobalLogger;
52 // a map from interval (in seconds) to delay (in seconds)
53 typedef std::pair<int, float> IntervalCountPair;
54 typedef std::map<int, float> DelayMap;
55 typedef shared_ptr<boost::asio::deadline_timer> TimerItem;
57 const boost::posix_time::time_duration SIGNAL_CHECK_INTERVAL = boost::posix_time::seconds(1);
59 //-----------------------------------------------------------------------------
61 //-----------------------------------------------------------------------------
63 typedef std::pair<bool, ConfigurationItem> GetConfigReturnType;
64 GetConfigReturnType get_configuration(int, const char**);
65 LinkStatusItem get_status_notifier(const ConfigurationItem&);
67 void set_log_output(const ConfigurationItem &);
68 DelayMap calc_pinger_delays(const HostList &hosts);
69 bool init_pingers(const IoServiceItem, const ConfigurationItem&,
70 const LinkStatusItem&, PingSchedulerList*);
71 void start_pingers(const PingSchedulerList&);
72 void stop_pingers(const PingSchedulerList&);
74 void signal_handler_int(int param);
75 void signal_handler_term(int param);
76 void signal_handler_usr1(int param);
77 void signal_handler_usr2(int param);
78 void signal_checker( const boost::system::error_code &error );
79 void install_signal_handlers( const IoServiceItem io_service, const int config_log_level );
80 void reset_signal_handlers();
82 // data required for signal handling (SIGINT, SIGTERM, ... )
83 struct signal_data_struct
85 volatile sig_atomic_t signaled_flag_int;
86 volatile sig_atomic_t signaled_flag_term;
87 volatile sig_atomic_t signaled_flag_usr1;
88 volatile sig_atomic_t signaled_flag_usr2;
89 IoServiceItem io_service;
90 void (*old_handler_int )(int);
91 void (*old_handler_term)(int);
92 void (*old_handler_usr1)(int);
93 void (*old_handler_usr2)(int);
95 TimerItem check_timer;
99 signaled_flag_int( 0 ),
100 signaled_flag_term( 0 ),
101 signaled_flag_usr1( 0 ),
102 signaled_flag_usr2( 0 ),
104 old_handler_int( 0 ),
105 old_handler_term( 0 ),
106 old_handler_usr1( 0 ),
107 old_handler_usr2( 0 ),
110 config_log_level( I2n::Logger::LogLevel::Notice )
114 //-----------------------------------------------------------------------------
116 //-----------------------------------------------------------------------------
118 GetConfigReturnType get_configuration(
123 ConfigurationReader config_reader;
124 bool parsed_success = config_reader.parse( argc, argv );
125 Configuration config_obj = config_reader.get_configuration();
127 ConfigurationItem configuration( new Configuration( config_obj ) );
128 GetConfigReturnType return_val( parsed_success, configuration );
132 LinkStatusItem get_status_notifier(
133 const ConfigurationItem &configuration
136 int hosts_down_limit = configuration->get_hosts_down_limit();
137 int link_up_interval_in_min = configuration->get_link_up_interval_in_min();
138 int link_down_interval_in_min = configuration->get_link_down_interval_in_min();
139 string status_notifier_cmd = configuration->get_status_notifier_cmd();
140 LinkStatusItem link_analyzer(
143 link_up_interval_in_min,
144 link_down_interval_in_min,
149 return link_analyzer;
154 // set default: log at level NOTICE to syslog and stderr
155 // to ensure that in case of faulty config, the error is noticed
156 I2n::Logger::enable_syslog( I2n::Logger::Facility::User );
157 I2n::Logger::enable_stderr_log( true );
158 I2n::Logger::set_log_level( I2n::Logger::LogLevel::Notice );
162 const ConfigurationItem &configuration
165 LogOutput log_output = configuration->get_log_output();
166 string log_file_name = configuration->get_log_file();
169 case LogOutput_UNDEFINED:
170 GlobalLogger.warning() << "Unknown output target -- use syslog";
171 case LogOutput_SYSLOG:
172 GlobalLogger.info() << "Setting log output target to syslog" << endl;
173 I2n::Logger::enable_syslog(true);
174 I2n::Logger::enable_stderr_log(false);
175 I2n::Logger::enable_log_file(false);
176 GlobalLogger.info() << "Set log output target to syslog" << endl;
178 case LogOutput_TERMINAL:
179 GlobalLogger.info() << "Setting log output target to terminal" << endl;
180 I2n::Logger::enable_syslog(false);
181 I2n::Logger::enable_stderr_log(true);
182 I2n::Logger::enable_log_file(false);
183 GlobalLogger.info() << "Set log output target to terminal" << endl;
184 GlobalLogger.info() << "(check syslog for earlier messages)" << endl;
187 GlobalLogger.info() << "Setting log output target to file "
188 << log_file_name << endl;
189 I2n::Logger::enable_syslog(false);
190 I2n::Logger::enable_stderr_log(false);
191 I2n::Logger::enable_log_file(log_file_name);
192 GlobalLogger.info() << "Set log output target to file "
193 << log_file_name << endl;
194 GlobalLogger.info() << "(check syslog for earlier messages)" << endl;
197 GlobalLogger.error() << "Unknown log output target!" << endl;
203 * @brief calculate delay between pingers to evenly distribute them in time
205 * If there are many pingers with same interval, will get bursts of pings
206 * and none in-between. This function calculates delays for large numbers
207 * of hosts with same ping intervals, to distribute them as evenly as
208 * possible, right from the start (might diverge over time, anyway).
210 * Will not do much good for pingers with many different intervals, but
211 * then is not required anyway and does no(t much) harm.
213 * Called by init_pingers with
214 * @param hosts list of hosts as obtained from configuration
215 * @returns a map from ping interval to delay between pingers of that interval
217 DelayMap calc_pinger_delays(const HostList &hosts)
219 // first step: count number of hosts with same intervals
220 DelayMap delay_shifts;
222 BOOST_FOREACH( const HostItem &host, hosts )
224 curr_interval = host->get_interval_in_sec();
226 delay_shifts[curr_interval] = 1.0f;
228 delay_shifts[curr_interval] += 1.0f;
231 // second step: divide intervals by counts, round to int
232 // --> for 18 pingers with a 30s interval, get 30s/18 = 1.66667
233 BOOST_FOREACH( IntervalCountPair interval_and_count, delay_shifts )
234 delay_shifts[interval_and_count.first] =
235 boost::numeric_cast<float>(interval_and_count.first) /
236 interval_and_count.second;
242 const IoServiceItem io_service,
243 const ConfigurationItem &configuration,
244 const LinkStatusItem &status_notifier,
245 PingSchedulerList *scheduler_list
248 string default_network_interface = configuration->get_source_network_interface();
249 int ping_fail_limit = configuration->get_ping_fail_limit();
250 int ping_reply_timeout = configuration->get_ping_reply_timeout();
252 // remove some hosts at random
253 configuration->randomize_hosts();
255 // calculate delays between pingers of same interval
256 DelayMap delay_shifts = calc_pinger_delays(configuration->get_hosts());
258 // setup memory for assigned delays
260 BOOST_FOREACH( IntervalCountPair interval_and_delay, delay_shifts )
261 delays[interval_and_delay.first] = 0.0f;
263 HostList hosts = configuration->get_hosts();
268 BOOST_FOREACH( const HostItem &host, hosts )
270 string destination_address = host->get_address();
271 uint16_t destination_port = host->get_port();
272 string host_network_interface = host->get_source_network_interface();
273 string network_interface = ( host_network_interface == "default" ) ?
274 default_network_interface :
275 host_network_interface;
276 PingProtocolList protocol_list = host->get_ping_protocol_list();
277 int ping_interval_in_sec = host->get_interval_in_sec();
279 // get delay for this scheduler and update assigned delays
280 int current_delay = boost::math::iround(delays[ping_interval_in_sec]);
281 delays[ping_interval_in_sec] += delay_shifts[ping_interval_in_sec];
283 PingSchedulerItem scheduler(
290 ping_interval_in_sec,
297 scheduler_list->push_back( scheduler );
304 const PingSchedulerList &scheduler_list
307 // start each ping scheduler
308 BOOST_FOREACH( const PingSchedulerItem &scheduler, scheduler_list )
309 scheduler->start_pinging();
313 const PingSchedulerList &scheduler_list
316 // Stop each ping scheduler
317 GlobalLogger.info() << "Telling all pingers to stop";
318 BOOST_FOREACH( const PingSchedulerItem &scheduler, scheduler_list )
320 scheduler->stop_pinging();
323 IcmpPacketDistributor::clean_up_all();
327 // the one instance of signal_data_struct
328 signal_data_struct signal_data;
331 /// registered as signal handler; just sets signal_data.signaled_flag
332 void signal_handler_int(int param)
334 signal_data.signaled_flag_int = 1;
336 void signal_handler_term(int param)
338 signal_data.signaled_flag_term = 1;
340 void signal_handler_usr1(int param)
342 signal_data.signaled_flag_usr1 = 1;
344 void signal_handler_usr2(int param)
346 signal_data.signaled_flag_usr2 = 1;
350 /// called regularly from io_service; checks signal_data.signal_flag
351 void signal_checker( const boost::system::error_code &error )
353 bool want_stop = false;
356 { // there was an error in the timer
357 if ( error == boost::asio::error::operation_aborted )
359 GlobalLogger.error() << "Signal check timer was cancelled! Stopping io_service" << endl;
364 GlobalLogger.error() << "Signal check timer handler received error code " << error
365 << "! Stopping io_service" << endl;
370 if ( signal_data.signaled_flag_int )
372 signal_data.signaled_flag_int = 0;
373 GlobalLogger.notice() << "Received signal SIGINT --> will stop" << endl;
376 else if ( signal_data.signaled_flag_term )
378 signal_data.signaled_flag_term = 0;
379 GlobalLogger.notice() << "Received signal SIGTERM --> will stop" << endl;
382 else if ( signal_data.signaled_flag_usr1 )
384 signal_data.signaled_flag_usr1 = 0;
385 int new_log_level = I2n::Logger::get_log_level()+1;
386 I2n::Logger::set_log_level( new_log_level );
387 GlobalLogger.info() << "Received SIGUSR1 -- increased log level to "
388 << I2n::Logger::get_log_level_string();
390 else if ( signal_data.signaled_flag_usr2 )
392 signal_data.signaled_flag_usr2 = 0;
393 I2n::Logger::set_log_level( signal_data.config_log_level );
394 GlobalLogger.info() << "Received SIGUSR2 -- reset log level to normal ("
395 << I2n::Logger::get_log_level_string() << ")";
400 { // interrupt infinite loop in main and asio event loop
401 signal_data.stopped = true;
402 signal_data.io_service->stop();
405 { // re-schedule timer
406 signal_data.check_timer->expires_from_now( SIGNAL_CHECK_INTERVAL );
407 signal_data.check_timer->async_wait( signal_checker );
411 /// register own signal handlers; see reset_signal_handlers for undo
412 void install_signal_handlers( const IoServiceItem io_service, const int config_log_level )
414 signal_data.signaled_flag_int = 0;
415 signal_data.signaled_flag_term = 0;
416 signal_data.signaled_flag_usr1 = 0;
417 signal_data.signaled_flag_usr2 = 0;
418 signal_data.config_log_level = config_log_level;
420 // install own signal handlers
421 signal_data.old_handler_int = signal(SIGINT, signal_handler_int);
422 signal_data.old_handler_term = signal(SIGTERM, signal_handler_term);
423 signal_data.old_handler_usr1 = signal(SIGUSR1, signal_handler_usr1);
424 signal_data.old_handler_usr2 = signal(SIGUSR2, signal_handler_usr2);
425 if ( signal_data.old_handler_int == SIG_ERR ||
426 signal_data.old_handler_term == SIG_ERR ||
427 signal_data.old_handler_usr1 == SIG_ERR ||
428 signal_data.old_handler_usr2 == SIG_ERR )
429 throw runtime_error( string("Failed to install signal handler: ") + string(strerror(errno)) );
431 // create a timer and a shared pointer to it, so it does not get out of scope
432 TimerItem check_timer( new boost::asio::deadline_timer( *io_service ) );
434 // remember the io_service and the timer
435 signal_data.io_service = io_service;
436 signal_data.check_timer = check_timer;
439 check_timer->expires_from_now( SIGNAL_CHECK_INTERVAL );
440 check_timer->async_wait( signal_checker );
441 GlobalLogger.debug() << "signal timer set" << endl;
444 /// reset handlers to the ones saved in install_signal_handlers
445 void reset_signal_handlers()
447 void (*old_handler_int)(int) = 0;
448 void (*old_handler_term)(int) = 0;
449 void (*old_handler_usr1)(int) = 0;
450 void (*old_handler_usr2)(int) = 0;
451 if (signal_data.old_handler_int != 0 )
452 old_handler_int = signal(SIGINT , signal_data.old_handler_int);
453 if (signal_data.old_handler_term != 0 )
454 old_handler_term = signal(SIGTERM, signal_data.old_handler_term);
455 if (signal_data.old_handler_usr1 != 0 )
456 old_handler_usr1 = signal(SIGUSR1, signal_data.old_handler_usr1);
457 if (signal_data.old_handler_usr2 != 0 )
458 old_handler_usr2 = signal(SIGUSR2, signal_data.old_handler_usr2);
460 if ( old_handler_int == SIG_ERR ||
461 old_handler_term == SIG_ERR ||
462 old_handler_usr1 == SIG_ERR ||
463 old_handler_usr2 == SIG_ERR )
464 throw runtime_error( string("Failed to reset signal handler: ") + string(strerror(errno)) );
468 int main( int argc, const char *argv[] )
471 GlobalLogger.debug() << "logger initiated with default config";
473 PingSchedulerList scheduler_list;
474 IoServiceItem io_service;
476 unsigned n_exceptions = 0;
477 unsigned max_exceptions = 0;
481 GetConfigReturnType success_and_config = get_configuration( argc, argv );
482 ConfigurationItem configuration = success_and_config.second;
484 if ( configuration->get_print_version() ) // do this even if parsing of config failed
486 GlobalLogger.debug() << "Printing version info ("
487 << VERSION_STRING << "." << VERSION_REVISION_STRING
488 << " build " << __DATE__
489 << ") and exit" << endl;
490 cout << PROJECT_NAME << " version "
491 << VERSION_STRING << "." << VERSION_REVISION_STRING
492 << " build " << __DATE__
497 if ( ! success_and_config.first )
499 GlobalLogger.error() << "Could not read/parse configuration!";
500 GlobalLogger.debug() << "Return 1 immediately" << endl;
503 GlobalLogger.debug() << "Start setup" << endl;
505 int log_level = configuration->get_log_level();
506 I2n::Logger::set_log_level( log_level );
507 GlobalLogger.info() << "Set LogLevel to " << I2n::Logger::get_log_level_string() << endl;
509 set_log_output( configuration );
510 GlobalLogger.notice() << "started pingcheck version "
511 << VERSION_STRING << "." << VERSION_REVISION_STRING
512 << " build " << __DATE__
515 bool daemon_mode = configuration->get_daemon();
518 I2n::Daemon::daemonize();
521 LinkStatusItem status_notifier = get_status_notifier( configuration );
523 IoServiceItem io_service_temp( new boost::asio::io_service() );
524 io_service_temp.swap( io_service );
525 io_service_temp.reset();
528 boost::asio::ip::address name_server_ip =
529 boost::asio::ip::address::from_string(
530 configuration->get_nameserver() );
531 int max_recursion_count = 10; // could make a config var some time
532 DnsMaster::create_master(
535 configuration->get_resolved_ip_ttl_threshold(),
536 configuration->get_min_time_between_resolves(),
537 configuration->get_max_address_resolution_attempts(),
539 configuration->get_dns_cache_file() );
541 if ( !init_pingers(io_service, configuration, status_notifier,
544 GlobalLogger.error() << "Could not initialize pingers or no hosts "
545 << "given to ping --> exit";
549 install_signal_handlers( io_service, log_level );
551 start_pingers( scheduler_list );
553 catch ( const std::exception &ex )
555 GlobalLogger.error() << "Uncaught exception. " << ex.what() << endl;
560 GlobalLogger.error() << "Caught unknown exception!" << endl;
567 GlobalLogger.info() << "starting io_service main loop" << endl;
569 if (max_exceptions > 0)
570 GlobalLogger.warning() << "Limited number of acceptable exceptions,"
571 << " this is a debugging option!";
573 // call boost::asio main event loop, catching exceptions
574 while ( !signal_data.stopped )
580 catch ( const std::exception &ex )
583 GlobalLogger.error() << "Caught exception, will continue. " << ex.what() << endl;
587 GlobalLogger.error() << "Caught unknown exception, will continue!" << endl;
590 if (max_exceptions > 0 && n_exceptions >= max_exceptions)
592 GlobalLogger.info() << "reached max number of exceptions allowed in main loop" << endl;
594 signal_data.stopped = true;
597 else if ( signal_data.stopped )
598 GlobalLogger.info() << "exiting io_service main loop" << endl;
599 // ( io_service->stop() has been called already in signal handler)
601 GlobalLogger.info() << "continuing io_service main loop" << endl;
608 GlobalLogger.info() << "Cleaning up" << endl;
609 stop_pingers( scheduler_list );
610 reset_signal_handlers();
612 catch ( const std::exception &ex )
614 GlobalLogger.error() << "Uncaught exception while cleaning up: " << ex.what() << endl;
618 GlobalLogger.error() << "Caught unknown exception while cleaning up!" << endl;
622 GlobalLogger.notice() << "Pingcheck done " << endl;
623 GlobalLogger.debug() << "In main loop, had " << n_exceptions << " exception[s]" << endl;