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 int killpid(pid_t pid, int sig)
  64 {
  65         int ret = -1;
  66         debug(D_EXIT, "Request to kill pid %d", pid);
  67
  68         errno = 0;
  69         if(kill(pid, 0) == -1) {
  70                 switch(errno) {
  71                         case ESRCH:
  72                                 error("Request to kill pid %d, but it is not running.", pid);
  73                                 break;
  74
  75                         case EPERM:
  76                                 error("Request to kill pid %d, but I do not have enough permissions.", pid);
  77                                 break;
  78
  79                         default:
  80                                 error("Request to kill pid %d, but I received an error.", pid);
  81                                 break;
  82                 }
  83         }
  84         else {
  85                 errno = 0;
  86
  87                 void (*old)(int);
  88                 old = signal(sig, SIG_IGN);
  89                 if(old == SIG_ERR) {
  90                         error("Cannot overwrite signal handler for signal %d", sig);
  91                         old = sig_handler;
  92                 }
  93
  94                 ret = kill(pid, sig);
  95
  96                 if(signal(sig, old) == SIG_ERR)
  97                         error("Cannot restore signal handler for signal %d", sig);
  98
  99                 if(ret == -1) {
 100                         switch(errno) {
 101                                 case ESRCH:
 102                                         error("Cannot kill pid %d, but it is not running.", pid);
 103                                         break;
 104
 105                                 case EPERM:
 106                                         error("Cannot kill pid %d, but I do not have enough permissions.", pid);
 107                                         break;
 108
 109                                 default:
 110                                         error("Cannot kill pid %d, but I received an error.", pid);
 111                                         break;
 112                         }
 113                 }
 114         }
 115
 116         return ret;
 117 }
 118
 119 void kill_childs()
 120 {
 121         siginfo_t info;
 122
 123         struct web_client *w;
 124         for(w = web_clients; w ; w = w->next) {
 125                 debug(D_EXIT, "Stopping web client %s", w->client_ip);
 126                 pthread_cancel(w->thread);
 127                 pthread_join(w->thread, NULL);
 128         }
 129
 130         int i;
 131         for (i = 0; static_threads[i].name != NULL ; i++) {
 132                 if(static_threads[i].thread) {
 133                         debug(D_EXIT, "Stopping %s thread", static_threads[i].name);
 134                         pthread_cancel(*static_threads[i].thread);
 135                         pthread_join(*static_threads[i].thread, NULL);
 136                         static_threads[i].thread = NULL;
 137                 }
 138         }
 139
 140         if(tc_child_pid) {
 141                 info("Killing tc-qos-helper procees");
 142                 if(killpid(tc_child_pid, SIGTERM) != -1)
 143                         waitid(tc_child_pid, 0, &info, WEXITED);
 144         }
 145         tc_child_pid = 0;
 146
 147         struct plugind *cd;
 148         for(cd = pluginsd_root ; cd ; cd = cd->next) {
 149                 debug(D_EXIT, "Stopping %s plugin thread", cd->id);
 150                 pthread_cancel(cd->thread);
 151                 pthread_join(cd->thread, NULL);
 152
 153                 if(cd->pid && !cd->obsolete) {
 154                         debug(D_EXIT, "killing %s plugin process", cd->id);
 155                         if(killpid(cd->pid, SIGTERM) != -1)
 156                                 waitid(cd->pid, 0, &info, WEXITED);
 157                 }
 158         }
 159
 160         debug(D_EXIT, "All threads/childs stopped.");
 161 }
 162
 163
 164 int main(int argc, char **argv)
 165 {
 166         int i;
 167         int config_loaded = 0;
 168
 169         // set the name for logging
 170         program_name = "netdata";
 171
 172         // parse  the arguments
 173         for(i = 1; i < argc ; i++) {
 174                 if(strcmp(argv[i], "-c") == 0 && (i+1) < argc) {
 175                         if(load_config(argv[i+1], 1) != 1) {
 176                                 fprintf(stderr, "Cannot load configuration file %s. Reason: %s\n", argv[i+1], strerror(errno));
 177                                 exit(1);
 178                         }
 179                         else {
 180                                 debug(D_OPTIONS, "Configuration loaded from %s.", argv[i+1]);
 181                                 config_loaded = 1;
 182                         }
 183                         i++;
 184                 }
 185                 else if(strcmp(argv[i], "-df") == 0 && (i+1) < argc) { config_set("global", "debug flags",  argv[i+1]); i++; }
 186                 else if(strcmp(argv[i], "-p")  == 0 && (i+1) < argc) { config_set("global", "port",         argv[i+1]); i++; }
 187                 else if(strcmp(argv[i], "-u")  == 0 && (i+1) < argc) { config_set("global", "run as user",  argv[i+1]); i++; }
 188                 else if(strcmp(argv[i], "-l")  == 0 && (i+1) < argc) { config_set("global", "history",      argv[i+1]); i++; }
 189                 else if(strcmp(argv[i], "-t")  == 0 && (i+1) < argc) { config_set("global", "update every", argv[i+1]); i++; }
 190                 else if(strcmp(argv[i], "--unittest")  == 0) {
 191                         if(unit_test_storage()) exit(1);
 192                         exit(0);
 193                         rrd_update_every = 1;
 194                         if(unit_test(1000000, 0)) exit(1);
 195                         if(unit_test(1000000, 500000)) exit(1);
 196                         if(unit_test(1000000, 100000)) exit(1);
 197                         if(unit_test(1000000, 900000)) exit(1);
 198                         if(unit_test(2000000, 0)) exit(1);
 199                         if(unit_test(2000000, 500000)) exit(1);
 200                         if(unit_test(2000000, 100000)) exit(1);
 201                         if(unit_test(2000000, 900000)) exit(1);
 202                         if(unit_test(500000, 500000)) exit(1);
 203                         //if(unit_test(500000, 100000)) exit(1); // FIXME: the expected numbers are wrong
 204                         //if(unit_test(500000, 900000)) exit(1); // FIXME: the expected numbers are wrong
 205                         if(unit_test(500000, 0)) exit(1);
 206                         fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
 207                         exit(0);
 208                 }
 209                 else {
 210                         fprintf(stderr, "Cannot understand option '%s'.\n", argv[i]);
 211                         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]);
 212                         fprintf(stderr, "  -c CONFIG FILE the configuration file to load. Default: %s.\n", CONFIG_DIR "/" CONFIG_FILENAME);
 213                         fprintf(stderr, "  -l LINES_TO_SAVE can be from 5 to %d lines in JSON data. Default: %d.\n", RRD_HISTORY_ENTRIES_MAX, RRD_DEFAULT_HISTORY_ENTRIES);
 214                         fprintf(stderr, "  -t UPDATE_TIMER can be from 1 to %d seconds. Default: %d.\n", UPDATE_EVERY_MAX, UPDATE_EVERY);
 215                         fprintf(stderr, "  -p LISTEN_PORT can be from 1 to %d. Default: %d.\n", 65535, LISTEN_PORT);
 216                         fprintf(stderr, "  -u USERNAME can be any system username to run as. Default: none.\n");
 217                         fprintf(stderr, "  -df FLAGS debug options. Default: 0x%8llx.\n", debug_flags);
 218                         exit(1);
 219                 }
 220         }
 221
 222         if(!config_loaded) load_config(NULL, 0);
 223
 224         char *input_log_file = NULL;
 225         char *output_log_file = NULL;
 226         char *error_log_file = NULL;
 227         char *access_log_file = NULL;
 228         {
 229                 char buffer[1024];
 230
 231                 // --------------------------------------------------------------------
 232
 233                 sprintf(buffer, "0x%08llx", 0ULL);
 234                 char *flags = config_get("global", "debug flags", buffer);
 235                 debug_flags = strtoull(flags, NULL, 0);
 236                 debug(D_OPTIONS, "Debug flags set to '0x%8llx'.", debug_flags);
 237
 238                 // --------------------------------------------------------------------
 239
 240                 output_log_file = config_get("global", "debug log", LOG_DIR "/debug.log");
 241                 if(strcmp(output_log_file, "syslog") == 0) {
 242                         output_log_syslog = 1;
 243                         output_log_file = NULL;
 244                 }
 245                 else if(strcmp(output_log_file, "none") == 0) {
 246                         output_log_syslog = 0;
 247                         output_log_file = NULL;
 248                 }
 249                 else output_log_syslog = 0;
 250
 251                 // --------------------------------------------------------------------
 252
 253                 silent = 0;
 254                 error_log_file = config_get("global", "error log", LOG_DIR "/error.log");
 255                 if(strcmp(error_log_file, "syslog") == 0) {
 256                         error_log_syslog = 1;
 257                         error_log_file = NULL;
 258                 }
 259                 else if(strcmp(error_log_file, "none") == 0) {
 260                         error_log_syslog = 0;
 261                         error_log_file = NULL;
 262                         silent = 1; // optimization - do not even generate debug log entries
 263                 }
 264                 else error_log_syslog = 0;
 265
 266                 // --------------------------------------------------------------------
 267
 268                 access_log_file = config_get("global", "access log", LOG_DIR "/access.log");
 269                 if(strcmp(access_log_file, "syslog") == 0) {
 270                         access_log_syslog = 1;
 271                         access_log_file = NULL;
 272                 }
 273                 else if(strcmp(access_log_file, "none") == 0) {
 274                         access_log_syslog = 0;
 275                         access_log_file = NULL;
 276                 }
 277                 else access_log_syslog = 0;
 278
 279                 // --------------------------------------------------------------------
 280
 281                 rrd_memory_mode = rrd_memory_mode_id(config_get("global", "memory mode", rrd_memory_mode_name(rrd_memory_mode)));
 282
 283                 // --------------------------------------------------------------------
 284
 285                 if(gethostname(buffer, HOSTNAME_MAX) == -1)
 286                         error("WARNING: Cannot get machine hostname.");
 287                 hostname = config_get("global", "hostname", buffer);
 288                 debug(D_OPTIONS, "hostname set to '%s'", hostname);
 289
 290                 // --------------------------------------------------------------------
 291
 292                 rrd_default_history_entries = config_get_number("global", "history", RRD_DEFAULT_HISTORY_ENTRIES);
 293                 if(rrd_default_history_entries < 5 || rrd_default_history_entries > RRD_HISTORY_ENTRIES_MAX) {
 294                         fprintf(stderr, "Invalid save lines %d given. Defaulting to %d.\n", rrd_default_history_entries, RRD_DEFAULT_HISTORY_ENTRIES);
 295                         rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
 296                 }
 297                 else {
 298                         debug(D_OPTIONS, "save lines set to %d.", rrd_default_history_entries);
 299                 }
 300
 301                 // --------------------------------------------------------------------
 302
 303                 rrd_update_every = config_get_number("global", "update every", UPDATE_EVERY);
 304                 if(rrd_update_every < 1 || rrd_update_every > 600) {
 305                         fprintf(stderr, "Invalid update timer %d given. Defaulting to %d.\n", rrd_update_every, UPDATE_EVERY_MAX);
 306                         rrd_update_every = UPDATE_EVERY;
 307                 }
 308                 else debug(D_OPTIONS, "update timer set to %d.", rrd_update_every);
 309
 310                 // --------------------------------------------------------------------
 311
 312                 for (i = 0; static_threads[i].name != NULL ; i++) {
 313                         struct netdata_static_thread *st = &static_threads[i];
 314
 315                         if(st->config_name) st->enabled = config_get_boolean(st->config_section, st->config_name, st->enabled);
 316                         if(st->enabled && st->init_routine) st->init_routine();
 317                 }
 318
 319                 // --------------------------------------------------------------------
 320
 321                 prepare_rundir();
 322                 char *user = config_get("global", "run as user", (getuid() == 0)?"nobody":"");
 323                 if(*user) {
 324                         if(become_user(user) != 0) {
 325                                 fprintf(stderr, "Cannot become user %s.\n", user);
 326                                 exit(1);
 327                         }
 328                         else debug(D_OPTIONS, "Successfully became user %s.", user);
 329                 }
 330
 331                 // --------------------------------------------------------------------
 332
 333                 listen_backlog = config_get_number("global", "http port listen backlog", LISTEN_BACKLOG);
 334
 335                 listen_port = config_get_number("global", "port", LISTEN_PORT);
 336                 if(listen_port < 1 || listen_port > 65535) {
 337                         fprintf(stderr, "Invalid listen port %d given. Defaulting to %d.\n", listen_port, LISTEN_PORT);
 338                         listen_port = LISTEN_PORT;
 339                 }
 340                 else debug(D_OPTIONS, "Listen port set to %d.", listen_port);
 341
 342                 int ip = 0;
 343                 char *ipv = config_get("global", "ip version", "any");
 344                 if(!strcmp(ipv, "any") || !strcmp(ipv, "both") || !strcmp(ipv, "all")) ip = 0;
 345                 else if(!strcmp(ipv, "ipv4") || !strcmp(ipv, "IPV4") || !strcmp(ipv, "IPv4") || !strcmp(ipv, "4")) ip = 4;
 346                 else if(!strcmp(ipv, "ipv6") || !strcmp(ipv, "IPV6") || !strcmp(ipv, "IPv6") || !strcmp(ipv, "6")) ip = 6;
 347                 else fprintf(stderr, "Cannot understand ip version '%s'. Assumming 'any'.", ipv);
 348
 349                 if(ip == 0 || ip == 6) listen_fd = create_listen_socket6(listen_port, listen_backlog);
 350                 if(listen_fd < 0) {
 351                         listen_fd = create_listen_socket4(listen_port, listen_backlog);
 352                         if(listen_fd >= 0 && ip != 4) fprintf(stderr, "Managed to open an IPv4 socket on port %d.", listen_port);
 353                 }
 354
 355                 if(listen_fd < 0) fatal("Cannot listen socket.");
 356         }
 357
 358         // never become a problem
 359         if(nice(20) == -1) fprintf(stderr, "Cannot lower my CPU priority. Error: %s.\n", strerror(errno));
 360
 361 #ifndef NETDATA_NO_DAEMON
 362         if(become_daemon(0, input_log_file, output_log_file, error_log_file, access_log_file, &access_fd, &stdaccess) == -1) {
 363                 fprintf(stderr, "Cannot demonize myself (%s).", strerror(errno));
 364                 exit(1);
 365         }
 366 #endif
 367
 368         if(output_log_syslog || error_log_syslog || access_log_syslog)
 369                 openlog("netdata", LOG_PID, LOG_DAEMON);
 370
 371         info("NetData started on pid %d", getpid());
 372
 373
 374         // catch all signals
 375         for (i = 1 ; i < 65 ;i++) {
 376                 switch(i) {
 377                         case SIGSEGV:
 378                         case SIGFPE:
 379                         case SIGCHLD:
 380                                 signal(i, SIG_DFL);
 381                                 break;
 382
 383                         default:
 384                                 signal(i,  sig_handler);
 385                                 break;
 386                 }
 387         }
 388
 389         for (i = 0; static_threads[i].name != NULL ; i++) {
 390                 struct netdata_static_thread *st = &static_threads[i];
 391
 392                 if(st->enabled) {
 393                         st->thread = malloc(sizeof(pthread_t));
 394
 395                         info("Starting thread %s.", st->name);
 396
 397                         if(pthread_create(st->thread, NULL, st->start_routine, NULL))
 398                                 error("failed to create new thread for %s.", st->name);
 399
 400                         else if(pthread_detach(*st->thread))
 401                                 error("Cannot request detach of newly created %s thread.", st->name);
 402                 }
 403                 else info("Not starting thread %s.", st->name);
 404         }
 405
 406         // for future use - the main thread
 407         while(1) sleep(60);
 408
 409         exit(0);
 410 }