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mqttd skeleton is finished
add user setting to default config

    1: #include "global.h"
    2: #include "rtlm.h"
    3: #include "utils.h"
    4: #include "daemon.h"
    5: 
    6: 
    7: sl_config cfg;
    8: extern char compiled[], compiledby[], compilehost[];
    9: int Verbose;
   10: 
   11: 
   12: static void
   13: Usage(void)
   14: {
   15: 	printf(	" -= MQTT Broker =- MQTT Service from ELWIX\n"
   16: 		"=== %s@%s === Compiled: %s ===\n\n"
   17: 		"\t-c <config>\tService config\n"
   18: 		"\t-b\t\tBatch mode\n"
   19: 		"\t-v\t\tVerbose (more -vvv, more verbose)\n"
   20: 		"\t-h\t\tHelp! This screen\n\n", 
   21: 		compiledby, compilehost, compiled);
   22: }
   23: 
   24: 
   25: int
   26: main(int argc, char **argv)
   27: {
   28: 	char ch, batch = 0, szStr[STRSIZ], szCfgName[MAXPATHLEN];
   29: 	register int i;
   30: 	sqlite3 *acc = NULL, *pub = NULL;
   31: 	FILE *logg = NULL;
   32: 	int sock = -1, ret = 0;
   33: 	struct passwd *pass;
   34: 
   35: 	strlcpy(szCfgName, DEFAULT_CONFIG, sizeof szCfgName);
   36: 	while ((ch = getopt(argc, argv, "hvbc:")) != -1)
   37: 		switch (ch) {
   38: 			case 'c':
   39: 				strlcpy(szCfgName, optarg, sizeof szCfgName);
   40: 				break;
   41: 			case 'b':
   42: 				batch++;
   43: 				break;
   44: 			case 'v':
   45: 				Verbose++;
   46: 				break;
   47: 			case 'h':
   48: 			default:
   49: 				Usage();
   50: 				return 1;
   51: 		}
   52: 	argc -= optind;
   53: 	argv += optind;
   54: 
   55: 	if (LoadConfig(szCfgName, &cfg)) {
   56: 		printf("Error:: can't load #%d - %s\n", cfg_GetErrno(), cfg_GetError());
   57: 		return 1;
   58: 	}
   59: 	openlog("mqttd", LOG_PID | LOG_CONS, LOG_DAEMON);
   60: 	for (i = 0; i < 3; i++)
   61: 		if (!mqttLoadRTLM(&cfg, i)) {
   62: 			printf("Error:: Can't load RTL module\n");
   63: 			while (i--)
   64: 				mqttUnloadRTLM(i);
   65: 			UnloadConfig(&cfg);
   66: 			closelog();
   67: 			return 2;
   68: 		}
   69: 	acc = call.OpenACC(&cfg);
   70: 	if (!acc) {
   71: 		ret = 3;
   72: 		goto end;
   73: 	}
   74: 	pub = call.OpenPUB(&cfg);
   75: 	if (!pub) {
   76: 		ret = 3;
   77: 		goto end;
   78: 	}
   79: 	logg = call.OpenLOG(&cfg);
   80: 	if (!logg) {
   81: 		ret = 3;
   82: 		goto end;
   83: 	}
   84: 
   85: 	if (mqttMkDir(&cfg)) {
   86: 		printf("Error:: in statedir #%d - %s\n", errno, strerror(errno));
   87: 		ret = 3;
   88: 		goto end;
   89: 	}
   90: 
   91: 	VERB(2) syslog(LOG_DEBUG, "Service is ready for start engine ...");
   92: 
   93: 	if ((sock = srv_Socket(&cfg)) == -1) {
   94: 		ret = 4;
   95: 		goto end;
   96: 	}
   97: 
   98: 	if (!batch)
   99: 		switch (fork()) {
  100: 			case -1:
  101: 				printf("Error:: in fork() #%d - %s\n", errno, strerror(errno));
  102: 				ret = 5;
  103: 				goto end;
  104: 			case 0:
  105: 				setsid();
  106: 				cfg_LoadAttribute(&cfg, CFG("mqttd"), CFG("user"), CFG(szStr), 
  107: 						sizeof szStr, MQTT_USER);
  108: 				pass = getpwnam(szStr);
  109: 				if (pass) {
  110: 					setgid(pass->pw_gid);
  111: 					setuid(pass->pw_uid);
  112: 					VERB(1) syslog(LOG_WARNING, "Try to change group #%d and user #%d", 
  113: 							pass->pw_gid, pass->pw_uid);
  114: 				}
  115: 				ret = open("/dev/null", O_RDWR);
  116: 				if (ret != -1) {
  117: 					dup2(ret, STDIN_FILENO);
  118: 					dup2(ret, STDOUT_FILENO);
  119: 					dup2(ret, STDERR_FILENO);
  120: 					close(ret);
  121: 				}
  122: 				VERB(2) syslog(LOG_DEBUG, "Welcome MQTT service into shadow land!");
  123: 				break;
  124: 			default:
  125: 				VERB(2) syslog(LOG_DEBUG, "MQTT service go to shadow land ...");
  126: 				ret = 0;
  127: 				goto end;
  128: 		}
  129: 	else
  130: 		VERB(1) printf("Start service in batch mode ...\n");
  131: 
  132: 	Run();
  133: 
  134: end:
  135: 	if (sock > STDERR_FILENO)
  136: 		srv_Close(sock);
  137: 	call.CloseLOG(logg);
  138: 	call.ClosePUB(pub);
  139: 	call.CloseACC(acc);
  140: 	for (i = 0; i < 3; i++)
  141: 		mqttUnloadRTLM(i);
  142: 	closelog();
  143: 	UnloadConfig(&cfg);
  144: 	return ret;
  145: }