src/main.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <signal.h>
   5 #include <syslog.h>
   6 #include <pthread.h>
   7 #include <string.h>
   8 #include <errno.h>
   9 #include <sys/types.h>
  10 #include <sys/wait.h>
  11
  12 #include "log.h"
  13 #include "daemon.h"
  14 #include "web_server.h"
  15 #include "popen.h"
  16 #include "config.h"
  17 #include "web_client.h"
  18 #include "rrd.h"
  19 #include "rrd2json.h"
  20
  21 #include "unit_test.h"
  22
  23 #include "plugins_d.h"
  24 #include "plugin_idlejitter.h"
  25 #include "plugin_tc.h"
  26 #include "plugin_checks.h"
  27 #include "plugin_proc.h"
  28 #include "plugin_nfacct.h"
  29
  30 #include "main.h"
  31
  32 struct netdata_static_thread {
  33         char *name;
  34
  35         char *config_section;
  36         char *config_name;
  37
  38         int enabled;
  39
  40         pthread_t *thread;
  41
  42         void (*init_routine) (void);
  43         void *(*start_routine) (void *);
  44 };
  45
  46 struct netdata_static_thread static_threads[] = {
  47         {"tc",                  "plugins",      "tc",                   1, NULL, NULL,  tc_main},
  48         {"idlejitter",  "plugins",      "idlejitter",   1, NULL, NULL,  cpuidlejitter_main},
  49         {"proc",                "plugins",      "proc",                 1, NULL, NULL,  proc_main},
  50
  51 #ifdef INTERNAL_PLUGIN_NFACCT
  52         // nfacct requires root access
  53         // so, we build it as an external plugin with setuid to root
  54         {"nfacct",              "plugins",      "nfacct",               1, NULL, NULL,  nfacct_main},
  55 #endif
  56
  57         {"plugins.d",   NULL,           NULL,                   1, NULL, NULL,  pluginsd_main},
  58         {"check",               "plugins",      "checks",               0, NULL, NULL,  checks_main},
  59         {"web",                 NULL,           NULL,                   1, NULL, NULL,  socket_listen_main},
  60         {NULL,                  NULL,           NULL,                   0, NULL, NULL,  NULL}
  61 };
  62
  63 void kill_childs()
  64 {
  65         siginfo_t info;
  66
  67         struct web_client *w;
  68         for(w = web_clients; w ; w = w->next) {
  69                 debug(D_EXIT, "Stopping web client %s", w->client_ip);
  70                 pthread_cancel(w->thread);
  71                 pthread_join(w->thread, NULL);
  72         }
  73
  74         int i;
  75         for (i = 0; static_threads[i].name != NULL ; i++) {
  76                 if(static_threads[i].thread) {
  77                         debug(D_EXIT, "Stopping %s thread", static_threads[i].name);
  78                         pthread_cancel(*static_threads[i].thread);
  79                         pthread_join(*static_threads[i].thread, NULL);
  80                         static_threads[i].thread = NULL;
  81                 }
  82         }
  83
  84         if(tc_child_pid) {
  85                 debug(D_EXIT, "Killing tc-qos-helper procees");
  86                 kill(tc_child_pid, SIGTERM);
  87                 waitid(tc_child_pid, 0, &info, WEXITED);
  88         }
  89         tc_child_pid = 0;
  90
  91         struct plugind *cd;
  92         for(cd = pluginsd_root ; cd ; cd = cd->next) {
  93                 debug(D_EXIT, "Stopping %s plugin thread", cd->id);
  94                 pthread_cancel(cd->thread);
  95                 pthread_join(cd->thread, NULL);
  96
  97                 if(cd->pid && !cd->obsolete) {
  98                         debug(D_EXIT, "killing %s plugin process", cd->id);
  99                         kill(cd->pid, SIGTERM);
 100                         waitid(cd->pid, 0, &info, WEXITED);
 101                 }
 102         }
 103
 104         debug(D_EXIT, "All threads/childs stopped.");
 105 }
 106
 107
 108 int main(int argc, char **argv)
 109 {
 110         int i;
 111         int config_loaded = 0;
 112
 113         // parse  the arguments
 114         for(i = 1; i < argc ; i++) {
 115                 if(strcmp(argv[i], "-c") == 0 && (i+1) < argc) {
 116                         if(load_config(argv[i+1], 1) != 1) {
 117                                 fprintf(stderr, "Cannot load configuration file %s. Reason: %s\n", argv[i+1], strerror(errno));
 118                                 exit(1);
 119                         }
 120                         else {
 121                                 debug(D_OPTIONS, "Configuration loaded from %s.", argv[i+1]);
 122                                 config_loaded = 1;
 123                         }
 124                         i++;
 125                 }
 126                 else if(strcmp(argv[i], "-df") == 0 && (i+1) < argc) { config_set("global", "debug flags",  argv[i+1]); i++; }
 127                 else if(strcmp(argv[i], "-p")  == 0 && (i+1) < argc) { config_set("global", "port",         argv[i+1]); i++; }
 128                 else if(strcmp(argv[i], "-u")  == 0 && (i+1) < argc) { config_set("global", "run as user",  argv[i+1]); i++; }
 129                 else if(strcmp(argv[i], "-l")  == 0 && (i+1) < argc) { config_set("global", "history",      argv[i+1]); i++; }
 130                 else if(strcmp(argv[i], "-t")  == 0 && (i+1) < argc) { config_set("global", "update every", argv[i+1]); i++; }
 131                 else if(strcmp(argv[i], "--unittest")  == 0) {
 132                         if(unit_test_storage()) exit(1);
 133                         exit(0);
 134                         update_every = 1;
 135                         if(unit_test(1000000, 0)) exit(1);
 136                         if(unit_test(1000000, 500000)) exit(1);
 137                         if(unit_test(1000000, 100000)) exit(1);
 138                         if(unit_test(1000000, 900000)) exit(1);
 139                         if(unit_test(2000000, 0)) exit(1);
 140                         if(unit_test(2000000, 500000)) exit(1);
 141                         if(unit_test(2000000, 100000)) exit(1);
 142                         if(unit_test(2000000, 900000)) exit(1);
 143                         if(unit_test(500000, 500000)) exit(1);
 144                         //if(unit_test(500000, 100000)) exit(1); // FIXME: the expected numbers are wrong
 145                         //if(unit_test(500000, 900000)) exit(1); // FIXME: the expected numbers are wrong
 146                         if(unit_test(500000, 0)) exit(1);
 147                         fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
 148                         exit(0);
 149                 }
 150                 else {
 151                         fprintf(stderr, "Cannot understand option '%s'.\n", argv[i]);
 152                         fprintf(stderr, "\nUSAGE: %s [-d] [-l LINES_TO_SAVE] [-u UPDATE_TIMER] [-p LISTEN_PORT] [-dl debug log file] [-df debug flags].\n\n", argv[0]);
 153                         fprintf(stderr, "  -c CONFIG FILE the configuration file to load. Default: %s.\n", CONFIG_DIR "/" CONFIG_FILENAME);
 154                         fprintf(stderr, "  -l LINES_TO_SAVE can be from 5 to %d lines in JSON data. Default: %d.\n", HISTORY_MAX, HISTORY);
 155                         fprintf(stderr, "  -t UPDATE_TIMER can be from 1 to %d seconds. Default: %d.\n", UPDATE_EVERY_MAX, UPDATE_EVERY);
 156                         fprintf(stderr, "  -p LISTEN_PORT can be from 1 to %d. Default: %d.\n", 65535, LISTEN_PORT);
 157                         fprintf(stderr, "  -u USERNAME can be any system username to run as. Default: none.\n");
 158                         fprintf(stderr, "  -df FLAGS debug options. Default: 0x%8llx.\n", debug_flags);
 159                         exit(1);
 160                 }
 161         }
 162
 163         if(!config_loaded) load_config(NULL, 0);
 164
 165         char *input_log_file = NULL;
 166         char *output_log_file = NULL;
 167         char *error_log_file = NULL;
 168         char *access_log_file = NULL;
 169         {
 170                 char buffer[1024];
 171
 172                 // --------------------------------------------------------------------
 173
 174                 sprintf(buffer, "0x%08llx", 0ULL);
 175                 char *flags = config_get("global", "debug flags", buffer);
 176                 debug_flags = strtoull(flags, NULL, 0);
 177                 debug(D_OPTIONS, "Debug flags set to '0x%8llx'.", debug_flags);
 178
 179                 // --------------------------------------------------------------------
 180
 181                 output_log_file = config_get("global", "debug log", LOG_DIR "/debug.log");
 182                 if(strcmp(output_log_file, "syslog") == 0) {
 183                         output_log_syslog = 1;
 184                         output_log_file = NULL;
 185                 }
 186                 else if(strcmp(output_log_file, "none") == 0) {
 187                         output_log_syslog = 0;
 188                         output_log_file = NULL;
 189                 }
 190                 else output_log_syslog = 0;
 191
 192                 // --------------------------------------------------------------------
 193
 194                 silent = 0;
 195                 error_log_file = config_get("global", "error log", LOG_DIR "/error.log");
 196                 if(strcmp(error_log_file, "syslog") == 0) {
 197                         error_log_syslog = 1;
 198                         error_log_file = NULL;
 199                 }
 200                 else if(strcmp(error_log_file, "none") == 0) {
 201                         error_log_syslog = 0;
 202                         error_log_file = NULL;
 203                         silent = 1; // optimization - do not even generate debug log entries
 204                 }
 205                 else error_log_syslog = 0;
 206
 207                 // --------------------------------------------------------------------
 208
 209                 access_log_file = config_get("global", "access log", LOG_DIR "/access.log");
 210                 if(strcmp(access_log_file, "syslog") == 0) {
 211                         access_log_syslog = 1;
 212                         access_log_file = NULL;
 213                 }
 214                 else if(strcmp(access_log_file, "none") == 0) {
 215                         access_log_syslog = 0;
 216                         access_log_file = NULL;
 217                 }
 218                 else access_log_syslog = 0;
 219
 220                 // --------------------------------------------------------------------
 221
 222                 memory_mode = memory_mode_id(config_get("global", "memory mode", memory_mode_name(memory_mode)));
 223
 224                 // --------------------------------------------------------------------
 225
 226                 if(gethostname(buffer, HOSTNAME_MAX) == -1)
 227                         error("WARNING: Cannot get machine hostname.");
 228                 hostname = config_get("global", "hostname", buffer);
 229                 debug(D_OPTIONS, "hostname set to '%s'", hostname);
 230
 231                 // --------------------------------------------------------------------
 232
 233                 save_history = config_get_number("global", "history", HISTORY);
 234                 if(save_history < 5 || save_history > HISTORY_MAX) {
 235                         fprintf(stderr, "Invalid save lines %d given. Defaulting to %d.\n", save_history, HISTORY);
 236                         save_history = HISTORY;
 237                 }
 238                 else {
 239                         debug(D_OPTIONS, "save lines set to %d.", save_history);
 240                 }
 241
 242                 // --------------------------------------------------------------------
 243
 244                 update_every = config_get_number("global", "update every", UPDATE_EVERY);
 245                 if(update_every < 1 || update_every > 600) {
 246                         fprintf(stderr, "Invalid update timer %d given. Defaulting to %d.\n", update_every, UPDATE_EVERY_MAX);
 247                         update_every = UPDATE_EVERY;
 248                 }
 249                 else debug(D_OPTIONS, "update timer set to %d.", update_every);
 250
 251                 // --------------------------------------------------------------------
 252
 253                 for (i = 0; static_threads[i].name != NULL ; i++) {
 254                         struct netdata_static_thread *st = &static_threads[i];
 255
 256                         if(st->config_name) st->enabled = config_get_boolean(st->config_section, st->config_name, st->enabled);
 257                         if(st->enabled && st->init_routine) st->init_routine();
 258                 }
 259
 260                 // --------------------------------------------------------------------
 261
 262                 prepare_rundir();
 263                 char *user = config_get("global", "run as user", (getuid() == 0)?"nobody":"");
 264                 if(*user) {
 265                         if(become_user(user) != 0) {
 266                                 fprintf(stderr, "Cannot become user %s.\n", user);
 267                                 exit(1);
 268                         }
 269                         else debug(D_OPTIONS, "Successfully became user %s.", user);
 270                 }
 271
 272                 // --------------------------------------------------------------------
 273
 274                 listen_port = config_get_number("global", "port", LISTEN_PORT);
 275                 if(listen_port < 1 || listen_port > 65535) {
 276                         fprintf(stderr, "Invalid listen port %d given. Defaulting to %d.\n", listen_port, LISTEN_PORT);
 277                         listen_port = LISTEN_PORT;
 278                 }
 279                 else debug(D_OPTIONS, "listen port set to %d.", listen_port);
 280
 281                 listen_fd = create_listen_socket(listen_port);
 282         }
 283
 284         // never become a problem
 285         if(nice(20) == -1) {
 286                 fprintf(stderr, "Cannot lower my CPU priority. Error: %s.\n", strerror(errno));
 287         }
 288
 289         if(become_daemon(0, input_log_file, output_log_file, error_log_file, access_log_file, &access_fd, &stdaccess) == -1) {
 290                 fprintf(stderr, "Cannot demonize myself (%s).", strerror(errno));
 291                 exit(1);
 292         }
 293
 294
 295         if(output_log_syslog || error_log_syslog || access_log_syslog)
 296                 openlog("netdata", LOG_PID, LOG_DAEMON);
 297
 298         info("NetData started on pid %d", getpid());
 299
 300
 301         // catch all signals
 302         for (i = 1 ; i < 65 ;i++) if(i != SIGSEGV && i != SIGFPE) signal(i,  sig_handler);
 303
 304         for (i = 0; static_threads[i].name != NULL ; i++) {
 305                 struct netdata_static_thread *st = &static_threads[i];
 306
 307                 if(st->enabled) {
 308                         st->thread = malloc(sizeof(pthread_t));
 309
 310                         info("Starting thread %s.", st->name);
 311
 312                         if(pthread_create(st->thread, NULL, st->start_routine, NULL))
 313                                 error("failed to create new thread for %s.", st->name);
 314
 315                         else if(pthread_detach(*st->thread))
 316                                 error("Cannot request detach of newly created %s thread.", st->name);
 317                 }
 318                 else info("Not starting thread %s.", st->name);
 319         }
 320
 321         // the main process - the web server listener
 322         // this never ends
 323         // socket_listen_main(NULL);
 324         while(1) process_childs(1);
 325
 326         exit(0);
 327 }