1 files changed, 324 insertions, 175 deletions

diff --git a/plugins/check_pgsql.c b/plugins/check_pgsql.c
index 6613634d..9e6b0f41 100644
--- a/plugins/check_pgsql.c
+++ b/plugins/check_pgsql.c
@@ -28,62 +28,63 @@
  *
  *****************************************************************************/
 
-const char *progname = "check_pgsql";
-const char *copyright = "1999-2024";
-const char *email = "devel@monitoring-plugins.org";
-
+#include "output.h"
+#include "perfdata.h"
+#include "states.h"
 #include "common.h"
 #include "utils.h"
 #include "utils_cmd.h"
-
+#include "check_pgsql.d/config.h"
+#include "thresholds.h"
 #include "netutils.h"
 #include <libpq-fe.h>
 #include <pg_config_manual.h>
 
-#define DEFAULT_DB   "template1"
+const char *progname = "check_pgsql";
+const char *copyright = "1999-2024";
+const char *email = "devel@monitoring-plugins.org";
+
 #define DEFAULT_HOST "127.0.0.1"
 
 /* return the PSQL server version as a 3-tuple */
-#define PSQL_SERVER_VERSION3(server_version)                                                                                               \
-        (server_version) / 10000, (server_version) / 100 - (int)((server_version) / 10000) * 100,                                              \
-                (server_version) - (int)((server_version) / 100) * 100
+#define PSQL_SERVER_VERSION3(server_version)                                                       \
+        ((server_version) / 10000),                                                                    \
+                (((server_version) / 100) - (int)(((server_version) / 10000) * 100)),                      \
+                (server_version) - (int)(((server_version) / 100) * 100)
 /* return true if the given host is a UNIX domain socket */
 #define PSQL_IS_UNIX_DOMAIN_SOCKET(host) ((NULL == (host)) || ('\0' == *(host)) || ('/' == *(host)))
 /* return a 3-tuple identifying a host/port independent of the socket type */
-#define PSQL_SOCKET3(host, port)                                                                                                           \
-        ((NULL == (host)) || ('\0' == *(host))) ? DEFAULT_PGSOCKET_DIR : host, PSQL_IS_UNIX_DOMAIN_SOCKET(host) ? "/.s.PGSQL." : ":", port
+#define PSQL_SOCKET3(host, port)                                                                   \
+        ((NULL == (host)) || ('\0' == *(host))) ? DEFAULT_PGSOCKET_DIR : host,                         \
+                PSQL_IS_UNIX_DOMAIN_SOCKET(host) ? "/.s.PGSQL." : ":", port
 
-enum {
-        DEFAULT_PORT = 5432,
-        DEFAULT_WARN = 2,
-        DEFAULT_CRIT = 8
-};
+typedef struct {
+        int errorcode;
+        check_pgsql_config config;
+} check_pgsql_config_wrapper;
+static check_pgsql_config_wrapper process_arguments(int /*argc*/, char ** /*argv*/);
 
-static int process_arguments(int /*argc*/, char ** /*argv*/);
 static void print_help(void);
 static bool is_pg_logname(char * /*username*/);
-static int do_query(PGconn * /*conn*/, char * /*query*/);
+
+typedef enum {
+        QUERY_OK,
+        ERROR_WITH_QUERY,     // critical
+        NO_ROWS_RETURNED,     // warning
+        NO_COLUMNS_RETURNED,  // warning
+        NO_DATA_RETURNED,     // critica/
+        RESULT_IS_NOT_NUMERIC // critical
+} do_query_errorcode;
+
+typedef struct {
+        do_query_errorcode error_code;
+        double numerical_result;
+} do_query_wrapper;
+static do_query_wrapper do_query(PGconn * /*conn*/, char * /*query*/);
 void print_usage(void);
 
-static char *pghost = NULL; /* host name of the backend server */
-static char *pgport = NULL; /* port of the backend server */
-static char *pgoptions = NULL;
-static char *pgtty = NULL;
-static char dbName[NAMEDATALEN] = DEFAULT_DB;
-static char *pguser = NULL;
-static char *pgpasswd = NULL;
-static char *pgparams = NULL;
-static double twarn = (double)DEFAULT_WARN;
-static double tcrit = (double)DEFAULT_CRIT;
-static char *pgquery = NULL;
-static char *pgqueryname = NULL;
-static char *query_warning = NULL;
-static char *query_critical = NULL;
-static thresholds *qthresholds = NULL;
 static int verbose = 0;
 
-#define OPTID_QUERYNAME -1000
-
 /******************************************************************************
 
 The (pseudo?)literate programming XML is contained within \@\@\- <XML> \-\@\@
@@ -139,21 +140,19 @@ int main(int argc, char **argv) {
         bindtextdomain(PACKAGE, LOCALEDIR);
         textdomain(PACKAGE);
 
-        /* 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 */
-
         /* Parse extra opts if any */
         argv = np_extra_opts(&argc, argv, progname);
 
-        if (process_arguments(argc, argv) == ERROR)
+        check_pgsql_config_wrapper tmp_config = process_arguments(argc, argv);
+        if (tmp_config.errorcode == ERROR) {
                 usage4(_("Could not parse arguments"));
-        if (verbose > 2)
-                printf("Arguments initialized\n");
+        }
+
+        const check_pgsql_config config = tmp_config.config;
+
+        if (config.output_format_is_set) {
+                mp_set_format(config.output_format);
+        }
 
         /* Set signal handling and alarm */
         if (signal(SIGALRM, timeout_alarm_handler) == SIG_ERR) {
@@ -162,25 +161,33 @@ int main(int argc, char **argv) {
         alarm(timeout_interval);
 
         char *conninfo = NULL;
-        if (pgparams)
-                asprintf(&conninfo, "%s ", pgparams);
-
-        asprintf(&conninfo, "%sdbname = '%s'", conninfo ? conninfo : "", 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 (config.pgparams) {
+                asprintf(&conninfo, "%s ", config.pgparams);
+        }
+
+        asprintf(&conninfo, "%sdbname = '%s'", conninfo ? conninfo : "", config.dbName);
+        if (config.pghost) {
+                asprintf(&conninfo, "%s host = '%s'", conninfo, config.pghost);
+        }
+        if (config.pgport) {
+                asprintf(&conninfo, "%s port = '%s'", conninfo, config.pgport);
+        }
+        if (config.pgoptions) {
+                asprintf(&conninfo, "%s options = '%s'", conninfo, config.pgoptions);
+        }
         /* if (pgtty) -- ignored by PQconnectdb */
-        if (pguser)
-                asprintf(&conninfo, "%s user = '%s'", conninfo, pguser);
+        if (config.pguser) {
+                asprintf(&conninfo, "%s user = '%s'", conninfo, config.pguser);
+        }
 
-        if (verbose) /* do not include password (see right below) in output */
-                printf("Connecting to PostgreSQL using conninfo: %s%s\n", conninfo, pgpasswd ? " password = <hidden>" : "");
+        if (verbose) { /* do not include password (see right below) in output */
+                printf("Connecting to PostgreSQL using conninfo: %s%s\n", conninfo,
+                           config.pgpasswd ? " password = <hidden>" : "");
+        }
 
-        if (pgpasswd)
-                asprintf(&conninfo, "%s password = '%s'", conninfo, pgpasswd);
+        if (config.pgpasswd) {
+                asprintf(&conninfo, "%s password = '%s'", conninfo, config.pgpasswd);
+        }
 
         /* make a connection to the database */
         struct timeval start_timeval;
@@ -193,30 +200,54 @@ int main(int argc, char **argv) {
                 --end_timeval.tv_sec;
                 end_timeval.tv_usec += 1000000;
         }
-        double elapsed_time =
-                (double)(end_timeval.tv_sec - start_timeval.tv_sec) + (double)(end_timeval.tv_usec - start_timeval.tv_usec) / 1000000.0;
+        double elapsed_time = (double)(end_timeval.tv_sec - start_timeval.tv_sec) +
+                                                  ((double)(end_timeval.tv_usec - start_timeval.tv_usec) / 1000000.0);
 
-        if (verbose)
+        if (verbose) {
                 printf("Time elapsed: %f\n", elapsed_time);
+        }
 
         /* check to see that the backend connection was successfully made */
-        if (verbose)
+        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;
         }
 
-        int status = STATE_UNKNOWN;
-        if (elapsed_time > tcrit) {
-                status = STATE_CRITICAL;
-        } else if (elapsed_time > twarn) {
-                status = STATE_WARNING;
+        mp_check overall = mp_check_init();
+
+        mp_set_ok_summary(&overall, "Postgres check is OK");
+
+        mp_subcheck sc_connection = mp_subcheck_init();
+
+        if (PQstatus(conn) == CONNECTION_BAD) {
+                sc_connection = mp_set_subcheck_state(sc_connection, STATE_CRITICAL);
+                xasprintf(&sc_connection.output, "no connection to '%s' (%s)", config.dbName,
+                                  PQerrorMessage(conn));
+                PQfinish(conn);
+                mp_add_subcheck_to_check(&overall, sc_connection);
+                mp_exit(overall);
         } else {
-                status = STATE_OK;
+                sc_connection = mp_set_subcheck_state(sc_connection, STATE_OK);
+                xasprintf(&sc_connection.output, "connected to '%s'", config.dbName);
+                mp_add_subcheck_to_check(&overall, sc_connection);
         }
 
+        mp_subcheck sc_connection_time = mp_subcheck_init();
+        sc_connection_time = mp_set_subcheck_default_state(sc_connection_time, STATE_UNKNOWN);
+
+        xasprintf(&sc_connection_time.output, "connection time: %.10g", elapsed_time);
+
+        mp_perfdata pd_connection_time = perfdata_init();
+        pd_connection_time.label = "time";
+        pd_connection_time.uom = "s";
+        pd_connection_time = mp_set_pd_value(pd_connection_time, elapsed_time);
+        pd_connection_time = mp_pd_set_thresholds(pd_connection_time, config.time_thresholds);
+
+        mp_add_perfdata_to_subcheck(&sc_connection_time, pd_connection_time);
+        sc_connection_time =
+                mp_set_subcheck_state(sc_connection_time, mp_get_pd_status(pd_connection_time));
+
+        mp_add_subcheck_to_check(&overall, sc_connection_time);
+
         if (verbose) {
                 char *server_host = PQhost(conn);
                 int server_version = PQserverVersion(conn);
@@ -224,25 +255,91 @@ int main(int argc, char **argv) {
                 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));
+                           PQdb(conn), PQuser(conn), PSQL_SOCKET3(server_host, PQport(conn)),
+                           PSQL_SERVER_VERSION3(server_version), PQprotocolVersion(conn), PQbackendPID(conn));
         }
 
-        printf(_(" %s - database %s (%f sec.)|%s\n"), state_text(status), dbName, elapsed_time,
-                   fperfdata("time", elapsed_time, "s", !!(twarn > 0.0), twarn, !!(tcrit > 0.0), tcrit, true, 0, false, 0));
+        if (config.pgquery) {
+                mp_subcheck sc_query = mp_subcheck_init();
+                sc_query = mp_set_subcheck_default_state(sc_query, STATE_UNKNOWN);
+                if (config.pgqueryname) {
+                        xasprintf(&sc_query.output, "query '%s'", config.pgqueryname);
+                } else {
+                        xasprintf(&sc_query.output, "query '%s'", config.pgquery);
+                }
+
+                do_query_wrapper query_result = do_query(conn, config.pgquery);
 
-        int query_status = STATE_UNKNOWN;
-        if (pgquery)
-                query_status = do_query(conn, pgquery);
+                switch (query_result.error_code) {
+                case QUERY_OK: {
+                        // Query was successful and there is a numerical result
+                        sc_query = mp_set_subcheck_state(sc_query, STATE_OK);
+                        xasprintf(&sc_query.output, "%s succeeded", sc_query.output);
+
+                        mp_perfdata pd_query = perfdata_init();
+                        pd_query = mp_set_pd_value(pd_query, query_result.numerical_result);
+                        pd_query = mp_pd_set_thresholds(pd_query, config.qthresholds);
+                        pd_query.label = "query";
+
+                        mp_subcheck sc_query_compare = mp_subcheck_init();
+                        mp_state_enum query_compare_state = mp_get_pd_status(pd_query);
+
+                        sc_query_compare = mp_set_subcheck_state(sc_query_compare, query_compare_state);
+                        mp_add_perfdata_to_subcheck(&sc_query_compare, pd_query);
+
+                        if (query_compare_state == STATE_OK) {
+                                xasprintf(&sc_query_compare.output, "query result '%f' is within thresholds",
+                                                  query_result.numerical_result);
+                        } else {
+                                xasprintf(&sc_query_compare.output, "query result '%f' is violating thresholds",
+                                                  query_result.numerical_result);
+                        }
+                        mp_add_subcheck_to_check(&overall, sc_query_compare);
 
-        if (verbose)
+                } break;
+                case ERROR_WITH_QUERY:
+                        xasprintf(&sc_query.output, "%s - Error with query: %s", sc_query.output,
+                                          PQerrorMessage(conn));
+                        sc_query = mp_set_subcheck_state(sc_query, STATE_CRITICAL);
+                        break;
+                case NO_ROWS_RETURNED:
+                        xasprintf(&sc_query.output, "%s - no rows were returned by the query", sc_query.output);
+                        sc_query = mp_set_subcheck_state(sc_query, STATE_WARNING);
+                        break;
+                case NO_COLUMNS_RETURNED:
+                        xasprintf(&sc_query.output, "%s - no columns were returned by the query",
+                                          sc_query.output);
+                        sc_query = mp_set_subcheck_state(sc_query, STATE_WARNING);
+                        break;
+                case NO_DATA_RETURNED:
+                        xasprintf(&sc_query.output, "%s - no data was returned by the query", sc_query.output);
+                        sc_query = mp_set_subcheck_state(sc_query, STATE_WARNING);
+                        break;
+                case RESULT_IS_NOT_NUMERIC:
+                        xasprintf(&sc_query.output, "%s - result of the query is not numeric", sc_query.output);
+                        sc_query = mp_set_subcheck_state(sc_query, STATE_CRITICAL);
+                        break;
+                };
+
+                mp_add_subcheck_to_check(&overall, sc_query);
+        }
+
+        if (verbose) {
                 printf("Closing connection\n");
+        }
         PQfinish(conn);
-        return (pgquery && query_status > status) ? query_status : status;
+
+        mp_exit(overall);
 }
 
 /* process command-line arguments */
-int process_arguments(int argc, char **argv) {
+static check_pgsql_config_wrapper process_arguments(int argc, char **argv) {
+
+        enum {
+                OPTID_QUERYNAME = CHAR_MAX + 1,
+                output_format_index,
+        };
+
         static struct option longopts[] = {{"help", no_argument, 0, 'h'},
                                                                            {"version", no_argument, 0, 'V'},
                                                                            {"timeout", required_argument, 0, 't'},
@@ -260,16 +357,35 @@ int process_arguments(int argc, char **argv) {
                                                                            {"query_critical", required_argument, 0, 'C'},
                                                                            {"query_warning", required_argument, 0, 'W'},
                                                                            {"verbose", no_argument, 0, 'v'},
+                                                                           {"output-format", required_argument, 0, output_format_index},
                                                                            {0, 0, 0, 0}};
 
+        check_pgsql_config_wrapper result = {
+                .errorcode = OK,
+                .config = check_pgsql_config_init(),
+        };
+
         while (true) {
                 int option = 0;
-                int option_char = getopt_long(argc, argv, "hVt:c:w:H:P:d:l:p:a:o:q:C:W:v", longopts, &option);
+                int option_char =
+                        getopt_long(argc, argv, "hVt:c:w:H:P:d:l:p:a:o:q:C:W:v", longopts, &option);
 
-                if (option_char == EOF)
+                if (option_char == EOF) {
                         break;
+                }
 
                 switch (option_char) {
+                case output_format_index: {
+                        parsed_output_format parser = mp_parse_output_format(optarg);
+                        if (!parser.parsing_success) {
+                                printf("Invalid output format: %s\n", optarg);
+                                exit(STATE_UNKNOWN);
+                        }
+
+                        result.config.output_format_is_set = true;
+                        result.config.output_format = parser.output_format;
+                        break;
+                }
                 case '?': /* usage */
                         usage5();
                 case 'h': /* help */
@@ -279,68 +395,89 @@ int process_arguments(int argc, char **argv) {
                         print_revision(progname, NP_VERSION);
                         exit(STATE_UNKNOWN);
                 case 't': /* timeout period */
-                        if (!is_integer(optarg))
+                        if (!is_integer(optarg)) {
                                 usage2(_("Timeout interval must be a positive integer"), optarg);
-                        else
+                        } 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 'c': /* critical time threshold */ {
+                        mp_range_parsed tmp = mp_parse_range_string(optarg);
+                        if (tmp.error != MP_PARSING_SUCCESS) {
+                                die(STATE_UNKNOWN, "failed to parse critical time threshold");
+                        }
+                        result.config.time_thresholds =
+                                mp_thresholds_set_crit(result.config.time_thresholds, tmp.range);
+                } break;
+                case 'w': /* warning time threshold */ {
+                        mp_range_parsed tmp = mp_parse_range_string(optarg);
+                        if (tmp.error != MP_PARSING_SUCCESS) {
+                                die(STATE_UNKNOWN, "failed to parse warning time threshold");
+                        }
+                        result.config.time_thresholds =
+                                mp_thresholds_set_warn(result.config.time_thresholds, tmp.range);
+                } break;
+                case 'C': /* critical query threshold */ {
+                        mp_range_parsed tmp = mp_parse_range_string(optarg);
+                        if (tmp.error != MP_PARSING_SUCCESS) {
+                                die(STATE_UNKNOWN, "failed to parse critical query threshold");
+                        }
+
+                        result.config.qthresholds =
+                                mp_thresholds_set_crit(result.config.qthresholds, tmp.range);
+
+                } break;
+                case 'W': /* warning query threshold */ {
+                        mp_range_parsed tmp = mp_parse_range_string(optarg);
+                        if (tmp.error != MP_PARSING_SUCCESS) {
+                                die(STATE_UNKNOWN, "failed to parse warning query threshold");
+                        }
+                        result.config.qthresholds =
+                                mp_thresholds_set_warn(result.config.qthresholds, tmp.range);
+                } break;
                 case 'H': /* host */
-                        if ((*optarg != '/') && (!is_host(optarg)))
+                        if ((*optarg != '/') && (!is_host(optarg))) {
                                 usage2(_("Invalid hostname/address"), optarg);
-                        else
-                                pghost = optarg;
+                        } else {
+                                result.config.pghost = optarg;
+                        }
                         break;
                 case 'P': /* port */
-                        if (!is_integer(optarg))
+                        if (!is_integer(optarg)) {
                                 usage2(_("Port must be a positive integer"), optarg);
-                        else
-                                pgport = optarg;
+                        } else {
+                                result.config.pgport = optarg;
+                        }
                         break;
                 case 'd': /* database name */
                         if (strlen(optarg) >= NAMEDATALEN) {
                                 usage2(_("Database name exceeds the maximum length"), optarg);
                         }
-                        snprintf(dbName, NAMEDATALEN, "%s", optarg);
+                        snprintf(result.config.dbName, NAMEDATALEN, "%s", optarg);
                         break;
                 case 'l': /* login name */
-                        if (!is_pg_logname(optarg))
+                        if (!is_pg_logname(optarg)) {
                                 usage2(_("User name is not valid"), optarg);
-                        else
-                                pguser = optarg;
+                        } else {
+                                result.config.pguser = optarg;
+                        }
                         break;
                 case 'p': /* authentication password */
                 case 'a':
-                        pgpasswd = optarg;
+                        result.config.pgpasswd = optarg;
                         break;
                 case 'o':
-                        if (pgparams)
-                                asprintf(&pgparams, "%s %s", pgparams, optarg);
-                        else
-                                asprintf(&pgparams, "%s", optarg);
+                        if (result.config.pgparams) {
+                                asprintf(&result.config.pgparams, "%s %s", result.config.pgparams, optarg);
+                        } else {
+                                asprintf(&result.config.pgparams, "%s", optarg);
+                        }
                         break;
                 case 'q':
-                        pgquery = optarg;
+                        result.config.pgquery = optarg;
                         break;
                 case OPTID_QUERYNAME:
-                        pgqueryname = optarg;
+                        result.config.pgqueryname = optarg;
                         break;
                 case 'v':
                         verbose++;
@@ -348,9 +485,7 @@ int process_arguments(int argc, char **argv) {
                 }
         }
 
-        set_thresholds(&qthresholds, query_warning, query_critical);
-
-        return OK;
+        return result;
 }
 
 /**
@@ -377,9 +512,10 @@ should be added.</para>
 -@@
 ******************************************************************************/
 
-bool is_pg_logname(char *username) {
-        if (strlen(username) > NAMEDATALEN - 1)
+static bool is_pg_logname(char *username) {
+        if (strlen(username) > NAMEDATALEN - 1) {
                 return (false);
+        }
         return (true);
 }
 
@@ -394,7 +530,7 @@ bool is_pg_logname(char *username) {
 void print_help(void) {
         char *myport;
 
-        xasprintf(&myport, "%d", DEFAULT_PORT);
+        xasprintf(&myport, "%d", 5432);
 
         print_revision(progname, NP_VERSION);
 
@@ -430,12 +566,13 @@ void print_help(void) {
         printf(" %s\n", "--queryname=STRING");
         printf("    %s\n", _("A name for the query, this string is used instead of the query"));
         printf("    %s\n", _("in the long output of the plugin"));
-        printf(" %s\n", "-W, --query-warning=RANGE");
+        printf(" %s\n", "-W, --query_warning=RANGE");
         printf("    %s\n", _("SQL query value to result in warning status (double)"));
-        printf(" %s\n", "-C, --query-critical=RANGE");
+        printf(" %s\n", "-C, --query_critical=RANGE");
         printf("    %s\n", _("SQL query value to result in critical status (double)"));
 
         printf(UT_VERBOSE);
+        printf(UT_OUTPUT_FORMAT);
 
         printf("\n");
         printf(" %s\n", _("All parameters are optional."));
@@ -447,29 +584,39 @@ void print_help(void) {
 
         printf(" %s\n", _("If a query is specified using the -q option, it will be executed after"));
         printf(" %s\n", _("connecting to the server. The result from the query has to be numeric."));
-        printf(" %s\n", _("Multiple SQL commands, separated by semicolon, are allowed but the result "));
+        printf(" %s\n",
+                   _("Multiple SQL commands, separated by semicolon, are allowed but the result "));
         printf(" %s\n", _("of the last command is taken into account only. The value of the first"));
-        printf(" %s\n", _("column in the first row is used as the check result. If a second column is"));
+        printf(" %s\n",
+                   _("column in the first row is used as the check result. If a second column is"));
         printf(" %s\n", _("present in the result set, this is added to the plugin output with a"));
-        printf(" %s\n", _("prefix of \"Extra Info:\". This information can be displayed in the system"));
+        printf(" %s\n",
+                   _("prefix of \"Extra Info:\". This information can be displayed in the system"));
         printf(" %s\n\n", _("executing the plugin."));
 
         printf(" %s\n", _("See the chapter \"Monitoring Database Activity\" of the PostgreSQL manual"));
-        printf(" %s\n\n", _("for details about how to access internal statistics of the database server."));
+        printf(" %s\n\n",
+                   _("for details about how to access internal statistics of the database server."));
 
-        printf(" %s\n", _("For a list of available connection parameters which may be used with the -o"));
-        printf(" %s\n", _("command line option, see the documentation for PQconnectdb() in the chapter"));
+        printf(" %s\n",
+                   _("For a list of available connection parameters which may be used with the -o"));
+        printf(" %s\n",
+                   _("command line option, see the documentation for PQconnectdb() in the chapter"));
         printf(" %s\n", _("\"libpq - C Library\" of the PostgreSQL manual. For example, this may be"));
-        printf(" %s\n", _("used to specify a service name in pg_service.conf to be used for additional"));
+        printf(" %s\n",
+                   _("used to specify a service name in pg_service.conf to be used for additional"));
         printf(" %s\n", _("connection parameters: -o 'service=<name>' or to specify the SSL mode:"));
         printf(" %s\n\n", _("-o 'sslmode=require'."));
 
         printf(" %s\n", _("The plugin will connect to a local postmaster if no host is specified. To"));
-        printf(" %s\n", _("connect to a remote host, be sure that the remote postmaster accepts TCP/IP"));
+        printf(" %s\n",
+                   _("connect to a remote host, be sure that the remote postmaster accepts TCP/IP"));
         printf(" %s\n\n", _("connections (start the postmaster with the -i option)."));
 
-        printf(" %s\n", _("Typically, the monitoring user (unless the --logname option is used) should be"));
-        printf(" %s\n", _("able to connect to the database without a password. The plugin can also send"));
+        printf(" %s\n",
+                   _("Typically, the monitoring user (unless the --logname option is used) should be"));
+        printf(" %s\n",
+                   _("able to connect to the database without a password. The plugin can also send"));
         printf(" %s\n", _("a password, but no effort is made to obscure or encrypt the password."));
 
         printf(UT_SUPPORT);
@@ -482,64 +629,66 @@ void print_usage(void) {
                    "[-q <query>] [-C <critical query range>] [-W <warning query range>]\n");
 }
 
-int do_query(PGconn *conn, char *query) {
-        if (verbose)
+static do_query_wrapper do_query(PGconn *conn, char *query) {
+        if (verbose) {
                 printf("Executing SQL query \"%s\".\n", query);
+        }
         PGresult *res = PQexec(conn, query);
 
+        do_query_wrapper result = {
+                .error_code = QUERY_OK,
+        };
+
         if (PGRES_TUPLES_OK != PQresultStatus(res)) {
-                printf(_("QUERY %s - %s: %s.\n"), _("CRITICAL"), _("Error with query"), PQerrorMessage(conn));
-                return STATE_CRITICAL;
+                // TODO
+                // printf(_("QUERY %s - %s: %s.\n"), _("CRITICAL"), _("Error with query"),
+                // PQerrorMessage(conn));
+                result.error_code = ERROR_WITH_QUERY;
+                return result;
         }
 
         if (PQntuples(res) < 1) {
-                printf("QUERY %s - %s.\n", _("WARNING"), _("No rows returned"));
-                return STATE_WARNING;
+                // TODO
+                // printf("QUERY %s - %s.\n", _("WARNING"), _("No rows returned"));
+                result.error_code = NO_ROWS_RETURNED;
+                return result;
         }
 
         if (PQnfields(res) < 1) {
-                printf("QUERY %s - %s.\n", _("WARNING"), _("No columns returned"));
-                return STATE_WARNING;
+                // TODO
+                // printf("QUERY %s - %s.\n", _("WARNING"), _("No columns returned"));
+                result.error_code = NO_COLUMNS_RETURNED;
+                return result;
         }
 
         char *val_str = PQgetvalue(res, 0, 0);
         if (!val_str) {
-                printf("QUERY %s - %s.\n", _("CRITICAL"), _("No data returned"));
-                return STATE_CRITICAL;
+                // TODO
+                // printf("QUERY %s - %s.\n", _("CRITICAL"), _("No data returned"));
+                result.error_code = NO_DATA_RETURNED;
+                return result;
         }
 
         char *endptr = NULL;
         double value = strtod(val_str, &endptr);
-        if (verbose)
+        if (verbose) {
                 printf("Query result: %f\n", value);
+        }
 
         if (endptr == val_str) {
-                printf("QUERY %s - %s: %s\n", _("CRITICAL"), _("Is not a numeric"), val_str);
-                return STATE_CRITICAL;
+                // TODO
+                // printf("QUERY %s - %s: %s\n", _("CRITICAL"), _("Is not a numeric"), val_str);
+                result.error_code = RESULT_IS_NOT_NUMERIC;
+                return result;
         }
 
         if ((endptr != NULL) && (*endptr != '\0')) {
-                if (verbose)
+                if (verbose) {
                         printf("Garbage after value: %s.\n", endptr);
+                }
         }
 
-        int my_status = get_status(value, qthresholds);
-        printf("QUERY %s - ", (my_status == STATE_OK)         ? _("OK")
-                                                  : (my_status == STATE_WARNING)  ? _("WARNING")
-                                                  : (my_status == STATE_CRITICAL) ? _("CRITICAL")
-                                                                                                                  : _("UNKNOWN"));
-        if (pgqueryname) {
-                printf(_("%s returned %f"), pgqueryname, value);
-        } else {
-                printf(_("'%s' returned %f"), query, value);
-        }
+        result.numerical_result = value;
 
-        printf("|query=%f;%s;%s;;\n", value, query_warning ? query_warning : "", query_critical ? query_critical : "");
-        if (PQnfields(res) > 1) {
-                char *extra_info = PQgetvalue(res, 0, 1);
-                if (extra_info != NULL) {
-                        printf("Extra Info: %s\n", extra_info);
-                }
-        }
-        return my_status;
+        return result;
 }