Quick Reference

Quick Reference 5 &progname; &SUMMARY; FAQ Theory, Installation, and Operation General Description &DESCRIPTION; Future Enhancements ToDo List Add option to get password from a secured file rather than the command line Functions -@@ ******************************************************************************/ int main (int argc, char **argv) { PGconn *conn; char *conninfo = NULL; int elapsed_time; int status = STATE_UNKNOWN; int query_status = STATE_UNKNOWN; /* begin, by setting the parameters for a backend connection if the * parameters are null, then the system will try to use reasonable * defaults by looking up environment variables or, failing that, * using hardwired constants */ pgoptions = NULL; /* special options to start up the backend server */ pgtty = NULL; /* debugging tty for the backend server */ setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); /* Parse extra opts if any */ argv=np_extra_opts (&argc, argv, progname); if (process_arguments (argc, argv) == ERROR) usage4 (_("Could not parse arguments")); if (verbose > 2) printf("Arguments initialized\n"); /* Set signal handling and alarm */ if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR) { usage4 (_("Cannot catch SIGALRM")); } alarm (timeout_interval); asprintf (&conninfo, "dbname = '%s'", dbName); if (pghost) asprintf (&conninfo, "%s host = '%s'", conninfo, pghost); if (pgport) asprintf (&conninfo, "%s port = '%s'", conninfo, pgport); if (pgoptions) asprintf (&conninfo, "%s options = '%s'", conninfo, pgoptions); /* if (pgtty) -- ignored by PQconnectdb */ if (pguser) asprintf (&conninfo, "%s user = '%s'", conninfo, pguser); if (verbose) /* do not include password (see right below) in output */ printf ("Connecting to PostgreSQL using conninfo: %s%s\n", conninfo, pgpasswd ? " password = " : ""); if (pgpasswd) asprintf (&conninfo, "%s password = '%s'", conninfo, pgpasswd); /* make a connection to the database */ time (&start_time); conn = PQconnectdb (conninfo); time (&end_time); elapsed_time = (int) (end_time - start_time); if (verbose) printf("Time elapsed: %d\n", elapsed_time); /* check to see that the backend connection was successfully made */ if (verbose) printf("Verifying connection\n"); if (PQstatus (conn) == CONNECTION_BAD) { printf (_("CRITICAL - no connection to '%s' (%s).\n"), dbName, PQerrorMessage (conn)); PQfinish (conn); return STATE_CRITICAL; } else if (elapsed_time > tcrit) { status = STATE_CRITICAL; } else if (elapsed_time > twarn) { status = STATE_WARNING; } else { status = STATE_OK; } if (verbose) { char *server_host = PQhost (conn); int server_version = PQserverVersion (conn); printf ("Successfully connected to database %s (user %s) " "at server %s%s%s (server version: %d.%d.%d, " "protocol version: %d, pid: %d)\n", PQdb (conn), PQuser (conn), PSQL_SOCKET3 (server_host, PQport (conn)), PSQL_SERVER_VERSION3 (server_version), PQprotocolVersion (conn), PQbackendPID (conn)); } printf (_(" %s - database %s (%d sec.)|%s\n"), state_text(status), dbName, elapsed_time, fperfdata("time", elapsed_time, "s", (int)twarn, twarn, (int)tcrit, tcrit, TRUE, 0, FALSE,0)); if (pgquery) query_status = do_query (conn, pgquery); if (verbose) printf("Closing connection\n"); PQfinish (conn); return (query_status > status) ? query_status : status; } /* process command-line arguments */ int process_arguments (int argc, char **argv) { int c; int option = 0; static struct option longopts[] = { {"help", no_argument, 0, 'h'}, {"version", no_argument, 0, 'V'}, {"timeout", required_argument, 0, 't'}, {"critical", required_argument, 0, 'c'}, {"warning", required_argument, 0, 'w'}, {"hostname", required_argument, 0, 'H'}, {"logname", required_argument, 0, 'l'}, {"password", required_argument, 0, 'p'}, {"authorization", required_argument, 0, 'a'}, {"port", required_argument, 0, 'P'}, {"database", required_argument, 0, 'd'}, {"query", required_argument, 0, 'q'}, {"query_critical", required_argument, 0, 'C'}, {"query_warning", required_argument, 0, 'W'}, {"verbose", no_argument, 0, 'v'}, {0, 0, 0, 0} }; while (1) { c = getopt_long (argc, argv, "hVt:c:w:H:P:d:l:p:a:q:C:W:v", longopts, &option); if (c == EOF) break; switch (c) { case '?': /* usage */ usage5 (); case 'h': /* help */ print_help (); exit (STATE_OK); case 'V': /* version */ print_revision (progname, NP_VERSION); exit (STATE_OK); case 't': /* timeout period */ if (!is_integer (optarg)) usage2 (_("Timeout interval must be a positive integer"), optarg); else timeout_interval = atoi (optarg); break; case 'c': /* critical time threshold */ if (!is_nonnegative (optarg)) usage2 (_("Critical threshold must be a positive integer"), optarg); else tcrit = strtod (optarg, NULL); break; case 'w': /* warning time threshold */ if (!is_nonnegative (optarg)) usage2 (_("Warning threshold must be a positive integer"), optarg); else twarn = strtod (optarg, NULL); break; case 'C': /* critical query threshold */ query_critical = optarg; break; case 'W': /* warning query threshold */ query_warning = optarg; break; case 'H': /* host */ if (!is_host (optarg)) usage2 (_("Invalid hostname/address"), optarg); else pghost = optarg; break; case 'P': /* port */ if (!is_integer (optarg)) usage2 (_("Port must be a positive integer"), optarg); else pgport = optarg; break; case 'd': /* database name */ if (!is_pg_dbname (optarg)) /* checks length and valid chars */ usage2 (_("Database name is not valid"), optarg); else /* we know length, and know optarg is terminated, so us strcpy */ strcpy (dbName, optarg); break; case 'l': /* login name */ if (!is_pg_logname (optarg)) usage2 (_("User name is not valid"), optarg); else pguser = optarg; break; case 'p': /* authentication password */ case 'a': pgpasswd = optarg; break; case 'q': pgquery = optarg; break; case 'v': verbose++; break; } } set_thresholds (&qthresholds, query_warning, query_critical); return validate_arguments (); } /****************************************************************************** @@- validate_arguments &PROTO_validate_arguments; Given a database name, this function returns TRUE if the string is a valid PostgreSQL database name, and returns false if it is not. Valid PostgreSQL database names are less than &NAMEDATALEN; characters long and consist of letters, numbers, and underscores. The first character cannot be a number, however. -@@ ******************************************************************************/ int validate_arguments () { return OK; } /****************************************************************************** @@- is_pg_dbname &PROTO_is_pg_dbname; Given a database name, this function returns TRUE if the string is a valid PostgreSQL database name, and returns false if it is not. Valid PostgreSQL database names are less than &NAMEDATALEN; characters long and consist of letters, numbers, and underscores. The first character cannot be a number, however. -@@ ******************************************************************************/ int is_pg_dbname (char *dbname) { char txt[NAMEDATALEN]; char tmp[NAMEDATALEN]; if (strlen (dbname) > NAMEDATALEN - 1) return (FALSE); strncpy (txt, dbname, NAMEDATALEN - 1); txt[NAMEDATALEN - 1] = 0; if (sscanf (txt, "%[_a-zA-Z]%[^_a-zA-Z0-9-]", tmp, tmp) == 1) return (TRUE); if (sscanf (txt, "%[_a-zA-Z]%[_a-zA-Z0-9-]%[^_a-zA-Z0-9-]", tmp, tmp, tmp) == 2) return (TRUE); return (FALSE); } /** the tango program should eventually create an entity here based on the function prototype @@- is_pg_logname &PROTO_is_pg_logname; Given a username, this function returns TRUE if the string is a valid PostgreSQL username, and returns false if it is not. Valid PostgreSQL usernames are less than &NAMEDATALEN; characters long and consist of letters, numbers, dashes, and underscores, plus possibly some other characters. Currently this function only checks string length. Additional checks should be added. -@@ ******************************************************************************/ int is_pg_logname (char *username) { if (strlen (username) > NAMEDATALEN - 1) return (FALSE); return (TRUE); } /****************************************************************************** @@-