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stabel daemon

    1: #include "global.h"
    2: #include "mqttd.h"
    3: #include "rtlm.h"
    4: #include "utils.h"
    5: #include "daemon.h"
    6: 
    7: 
    8: sl_config cfg;
    9: sessions_t Sessions;
   10: sched_root_task_t *root;
   11: sqlite3 *acc, *pub;
   12: pthread_mutex_t mtx_sess;
   13: FILE *logg;
   14: extern char compiled[], compiledby[], compilehost[];
   15: static char szCfgName[MAXPATHLEN];
   16: int Verbose, Kill;
   17: 
   18: 
   19: static void
   20: Usage(void)
   21: {
   22: 	printf(	" -= MQTT Broker =- MQTT Service from ELWIX\n"
   23: 		"=== %s@%s === Compiled: %s ===\n\n"
   24: 		"\t-c <config>\tService config\n"
   25: 		"\t-b\t\tBatch mode\n"
   26: 		"\t-v\t\tVerbose (more -vvv, more verbose)\n"
   27: 		"\t-h\t\tHelp! This screen\n\n", 
   28: 		compiledby, compilehost, compiled);
   29: }
   30: 
   31: static void
   32: sigHand(int sig)
   33: {
   34: 	int stat;
   35: 
   36: 	switch (sig) {
   37: 		case SIGHUP:
   38: 			UnloadConfig(&cfg);
   39: 			if (!LoadConfig(szCfgName, &cfg)) {
   40: 				VERB(1) syslog(LOG_DEBUG, "Config reload OK!");
   41: 				break;
   42: 			}
   43: 
   44: 			syslog(LOG_ERR, "Error:: can't reload #%d - %s", cfg_GetErrno(), cfg_GetError());
   45: 		case SIGTERM:
   46: 			VERB(1) syslog(LOG_DEBUG, "Terminate MQTT service in progress");
   47: 			Kill++;
   48: 			break;
   49: 		case SIGCHLD:
   50: 			while (waitpid(-1, &stat, WNOHANG) > 0);
   51: 			break;
   52: 	}
   53: }
   54: 
   55: 
   56: int
   57: main(int argc, char **argv)
   58: {
   59: 	char ch, batch = 0, szStr[STRSIZ];
   60: 	register int i;
   61: 	int sock = -1, ret = 0;
   62: 	struct passwd *pass;
   63: 	struct sigaction sa;
   64: 
   65: 	TAILQ_INIT(&Sessions);
   66: 
   67: 	strlcpy(szCfgName, DEFAULT_CONFIG, sizeof szCfgName);
   68: 	while ((ch = getopt(argc, argv, "hvbc:")) != -1)
   69: 		switch (ch) {
   70: 			case 'c':
   71: 				strlcpy(szCfgName, optarg, sizeof szCfgName);
   72: 				break;
   73: 			case 'b':
   74: 				batch++;
   75: 				break;
   76: 			case 'v':
   77: 				Verbose++;
   78: 				break;
   79: 			case 'h':
   80: 			default:
   81: 				Usage();
   82: 				return 1;
   83: 		}
   84: 	argc -= optind;
   85: 	argv += optind;
   86: 
   87: 	if (LoadConfig(szCfgName, &cfg)) {
   88: 		printf("Error:: can't load #%d - %s\n", cfg_GetErrno(), cfg_GetError());
   89: 		return 1;
   90: 	}
   91: 	pthread_mutex_init(&mtx_sess, NULL);
   92: 	openlog("mqttd", LOG_PID | LOG_CONS, LOG_DAEMON);
   93: 	for (i = 0; i < 3; i++)
   94: 		if (!mqttLoadRTLM(&cfg, i)) {
   95: 			printf("Error:: Can't load RTL module\n");
   96: 			while (i--)
   97: 				mqttUnloadRTLM(i);
   98: 			UnloadConfig(&cfg);
   99: 			closelog();
  100: 			pthread_mutex_destroy(&mtx_sess);
  101: 			return 2;
  102: 		}
  103: 	acc = call.OpenACC(&cfg);
  104: 	if (!acc) {
  105: 		ret = 3;
  106: 		goto end;
  107: 	}
  108: 	pub = call.OpenPUB(&cfg);
  109: 	if (!pub) {
  110: 		ret = 3;
  111: 		goto end;
  112: 	}
  113: 	logg = call.OpenLOG(&cfg);
  114: 	if (!logg) {
  115: 		ret = 3;
  116: 		goto end;
  117: 	}
  118: 
  119: 	if (mqttMkDir(&cfg)) {
  120: 		printf("Error:: in statedir #%d - %s\n", errno, strerror(errno));
  121: 		ret = 3;
  122: 		goto end;
  123: 	}
  124: 
  125: 	memset(&sa, 0, sizeof sa);
  126: 	sigemptyset(&sa.sa_mask);
  127: 	sa.sa_handler = sigHand;
  128: 	sigaction(SIGHUP, &sa, NULL);
  129: 	sigaction(SIGTERM, &sa, NULL);
  130: 	sigaction(SIGCHLD, &sa, NULL);
  131: 
  132: 	if (!batch)
  133: 		switch (fork()) {
  134: 			case -1:
  135: 				printf("Error:: in fork() #%d - %s\n", errno, strerror(errno));
  136: 				ret = 5;
  137: 				goto end;
  138: 			case 0:
  139: 				setsid();
  140: 
  141: 				ret = open("/dev/null", O_RDWR);
  142: 				if (ret != -1) {
  143: 					dup2(ret, STDIN_FILENO);
  144: 					dup2(ret, STDOUT_FILENO);
  145: 					dup2(ret, STDERR_FILENO);
  146: 					close(ret);
  147: 				}
  148: 				VERB(2) syslog(LOG_DEBUG, "Welcome MQTT service into shadow land!");
  149: 				break;
  150: 			default:
  151: 				VERB(2) syslog(LOG_DEBUG, "MQTT service go to shadow land ...");
  152: 				sleep(1);
  153: 				ret = 0;
  154: 				goto end;
  155: 		}
  156: 	else
  157: 		VERB(1) printf("Start service in batch mode ...\n");
  158: 
  159: 	VERB(2) syslog(LOG_DEBUG, "Service is ready for start engine ...");
  160: 
  161: 	if ((sock = srv_Socket(&cfg)) == -1) {
  162: 		ret = 4;
  163: 		goto end;
  164: 	}
  165: 
  166: 	cfg_LoadAttribute(&cfg, CFG("mqttd"), CFG("user"), CFG(szStr), sizeof szStr, MQTT_USER);
  167: 	pass = getpwnam(szStr);
  168: 	if (pass) {
  169: 		setgid(pass->pw_gid);
  170: 		setuid(pass->pw_uid);
  171: 		VERB(1) syslog(LOG_WARNING, "Try to change group #%d and user #%d", pass->pw_gid, pass->pw_uid);
  172: 	}
  173: 
  174: 	if (!(root = schedBegin())) {
  175: 		printf("Error:: scheduler #%d - %s\n", sched_GetErrno(), sched_GetError());
  176: 		ret = 6;
  177: 		goto end;
  178: 	}
  179: 
  180: 	Run(sock);
  181: 
  182: 	schedEnd(&root);
  183: end:
  184: 	if (sock > STDERR_FILENO)
  185: 		srv_Close(sock);
  186: 	call.CloseLOG(logg);
  187: 	call.ClosePUB(pub);
  188: 	call.CloseACC(acc);
  189: 	for (i = 0; i < 3; i++)
  190: 		mqttUnloadRTLM(i);
  191: 	closelog();
  192: 	UnloadConfig(&cfg);
  193: 	pthread_mutex_destroy(&mtx_sess);
  194: 	return ret;
  195: }