Revert "Migrate check_users to new ouput infrastructure"

This reverts commit 10086edbf03fd807794bcfb3fff626da69a9fdb2.

1 files changed, 130 insertions, 119 deletions

diff --git a/plugins/check_users.c b/plugins/check_users.c
index 6ec87d21..f1e1c39d 100644
--- a/plugins/check_users.c
+++ b/plugins/check_users.c
@@ -3,7 +3,7 @@
  * Monitoring check_users plugin
  *
  * License: GPL
- * Copyright (c) 2000-2025 Monitoring Plugins Development Team
+ * Copyright (c) 2000-2024 Monitoring Plugins Development Team
  *
  * Description:
  *
@@ -30,19 +30,12 @@
  *
  *****************************************************************************/
 
-#include "check_users.d/config.h"
-#include "thresholds.h"
 const char *progname = "check_users";
-const char *copyright = "2000-2025";
+const char *copyright = "2000-2024";
 const char *email = "devel@monitoring-plugins.org";
 
-#include "check_users.d/users.h"
-#include "output.h"
-#include "perfdata.h"
-#include "states.h"
-#include "utils_base.h"
-#include "./common.h"
-#include "./utils.h"
+#include "common.h"
+#include "utils.h"
 
 #if HAVE_WTSAPI32_H
 #       include <windows.h>
@@ -60,16 +53,29 @@ const char *email = "devel@monitoring-plugins.org";
 #       include <systemd/sd-login.h>
 #endif
 
-typedef struct process_argument_wrapper {
-        int errorcode;
-        check_users_config config;
-} process_argument_wrapper;
+#define possibly_set(a, b) ((a) == 0 ? (b) : 0)
 
-process_argument_wrapper process_arguments(int /*argc*/, char ** /*argv*/);
-void print_help(void);
+static int process_arguments(int, char **);
+static void print_help(void);
 void print_usage(void);
 
+static char *warning_range = NULL;
+static char *critical_range = NULL;
+static thresholds *thlds = NULL;
+
 int main(int argc, char **argv) {
+        int users = -1;
+        int result = STATE_UNKNOWN;
+#if HAVE_WTSAPI32_H
+        WTS_SESSION_INFO *wtsinfo;
+        DWORD wtscount;
+        DWORD index;
+#elif HAVE_UTMPX_H
+        struct utmpx *putmpx;
+#else
+        char input_buffer[MAX_INPUT_BUFFER];
+#endif
+
         setlocale(LC_ALL, "");
         bindtextdomain(PACKAGE, LOCALEDIR);
         textdomain(PACKAGE);
@@ -77,106 +83,121 @@ int main(int argc, char **argv) {
         /* Parse extra opts if any */
         argv = np_extra_opts(&argc, argv, progname);
 
-        process_argument_wrapper tmp = process_arguments(argc, argv);
-
-        if (tmp.errorcode == ERROR) {
+        if (process_arguments(argc, argv) == ERROR)
                 usage4(_("Could not parse arguments"));
-        }
 
-        check_users_config config = tmp.config;
+        users = 0;
+
+#ifdef HAVE_LIBSYSTEMD
+        if (sd_booted() > 0)
+                users = sd_get_sessions(NULL);
+        else {
+#endif
+#if HAVE_WTSAPI32_H
+                if (!WTSEnumerateSessions(WTS_CURRENT_SERVER_HANDLE, 0, 1, &wtsinfo, &wtscount)) {
+                        printf(_("Could not enumerate RD sessions: %d\n"), GetLastError());
+                        return STATE_UNKNOWN;
+                }
+
+                for (index = 0; index < wtscount; index++) {
+                        LPTSTR username;
+                        DWORD size;
+                        int len;
 
-#ifdef _WIN32
-#       if HAVE_WTSAPI32_H
-        get_num_of_users_wrapper user_wrapper = get_num_of_users_windows();
-#       else
-#               error Did not find WTSAPI32
-#       endif // HAVE_WTSAPI32_H
+                        if (!WTSQuerySessionInformation(WTS_CURRENT_SERVER_HANDLE, wtsinfo[index].SessionId, WTSUserName, &username, &size))
+                                continue;
+
+                        len = lstrlen(username);
+
+                        WTSFreeMemory(username);
+
+                        if (len == 0)
+                                continue;
+
+                        if (wtsinfo[index].State == WTSActive || wtsinfo[index].State == WTSDisconnected)
+                                users++;
+                }
+
+                WTSFreeMemory(wtsinfo);
+#elif HAVE_UTMPX_H
+        /* get currently logged users from utmpx */
+        setutxent();
+
+        while ((putmpx = getutxent()) != NULL)
+                if (putmpx->ut_type == USER_PROCESS)
+                        users++;
+
+        endutxent();
 #else
-#       ifdef HAVE_LIBSYSTEMD
-        get_num_of_users_wrapper user_wrapper = get_num_of_users_systemd();
-#       elif HAVE_UTMPX_H
-        get_num_of_users_wrapper user_wrapper = get_num_of_users_utmp();
-#       else  // !HAVE_LIBSYSTEMD && !HAVE_UTMPX_H
-        get_num_of_users_wrapper user_wrapper = get_num_of_users_who_command();
-#       endif // HAVE_LIBSYSTEMD
-#endif     // _WIN32
-
-        mp_check overall = mp_check_init();
-        mp_subcheck sc_users = mp_subcheck_init();
-
-        if (user_wrapper.errorcode != 0) {
-                sc_users = mp_set_subcheck_state(sc_users, STATE_UNKNOWN);
-                sc_users.output = "Failed to retrieve number of users";
-                mp_add_subcheck_to_check(&overall, sc_users);
-                mp_exit(overall);
+        /* run the command */
+        child_process = spopen(WHO_COMMAND);
+        if (child_process == NULL) {
+                printf(_("Could not open pipe: %s\n"), WHO_COMMAND);
+                return STATE_UNKNOWN;
         }
+
+        child_stderr = fdopen(child_stderr_array[fileno(child_process)], "r");
+        if (child_stderr == NULL)
+                printf(_("Could not open stderr for %s\n"), WHO_COMMAND);
+
+        while (fgets(input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
+                /* increment 'users' on all lines except total user count */
+                if (input_buffer[0] != '#') {
+                        users++;
+                        continue;
+                }
+
+                /* get total logged in users */
+                if (sscanf(input_buffer, _("# users=%d"), &users) == 1)
+                        break;
+        }
+
+        /* check STDERR */
+        if (fgets(input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
+                result = possibly_set(result, STATE_UNKNOWN);
+        (void)fclose(child_stderr);
+
+        /* close the pipe */
+        if (spclose(child_process))
+                result = possibly_set(result, STATE_UNKNOWN);
+#endif
+#ifdef HAVE_LIBSYSTEMD
+        }
+#endif
+
         /* check the user count against warning and critical thresholds */
+        result = get_status((double)users, thlds);
 
-        mp_perfdata users_pd = {
-                .label = "users",
-                .value = mp_create_pd_value(user_wrapper.users),
-        };
-
-        users_pd = mp_pd_set_thresholds(users_pd, config.thresholds);
-        mp_add_perfdata_to_subcheck(&sc_users, users_pd);
-
-        int tmp_status = mp_get_pd_status(users_pd);
-        sc_users = mp_set_subcheck_state(sc_users, tmp_status);
-
-        switch (tmp_status) {
-        case STATE_WARNING:
-                xasprintf(&sc_users.output, "%d users currently logged in. This violates the warning threshold", user_wrapper.users);
-                break;
-        case STATE_CRITICAL:
-                xasprintf(&sc_users.output, "%d users currently logged in. This violates the critical threshold", user_wrapper.users);
-                break;
-        default:
-                xasprintf(&sc_users.output, "%d users currently logged in", user_wrapper.users);
+        if (result == STATE_UNKNOWN)
+                printf("%s\n", _("Unable to read output"));
+        else {
+                printf(_("USERS %s - %d users currently logged in |%s\n"), state_text(result), users,
+                           sperfdata_int("users", users, "", warning_range, critical_range, true, 0, false, 0));
         }
 
-        mp_add_subcheck_to_check(&overall, sc_users);
-        mp_exit(overall);
+        return result;
 }
 
-#define output_format_index CHAR_MAX + 1
-
 /* process command-line arguments */
-process_argument_wrapper process_arguments(int argc, char **argv) {
+int process_arguments(int argc, char **argv) {
         static struct option longopts[] = {{"critical", required_argument, 0, 'c'},
                                                                            {"warning", required_argument, 0, 'w'},
                                                                            {"version", no_argument, 0, 'V'},
                                                                            {"help", no_argument, 0, 'h'},
-                                                                           {"output-format", required_argument, 0, output_format_index},
                                                                            {0, 0, 0, 0}};
 
-        if (argc < 2) {
+        if (argc < 2)
                 usage("\n");
-        }
-
-        char *warning_range = NULL;
-        char *critical_range = NULL;
-        check_users_config config = check_users_config_init();
 
+        int option_char;
         while (true) {
-                int counter = getopt_long(argc, argv, "+hVvc:w:", longopts, NULL);
+                int option = 0;
+                option_char = getopt_long(argc, argv, "+hVvc:w:", longopts, &option);
 
-                if (counter == -1 || counter == EOF || counter == 1) {
+                if (option_char == -1 || option_char == EOF || option_char == 1)
                         break;
-                }
 
-                switch (counter) {
-                case output_format_index: {
-                        parsed_output_format parser = mp_parse_output_format(optarg);
-                        if (!parser.parsing_success) {
-                                // TODO List all available formats here, maybe add anothoer usage function
-                                printf("Invalid output format: %s\n", optarg);
-                                exit(STATE_UNKNOWN);
-                        }
-
-                        config.output_format_is_set = true;
-                        config.output_format = parser.output_format;
-                        break;
-                }
+                switch (option_char) {
                 case '?': /* print short usage statement if args not parsable */
                         usage5();
                 case 'h': /* help */
@@ -194,35 +215,26 @@ process_argument_wrapper process_arguments(int argc, char **argv) {
                 }
         }
 
-        // TODO add proper verification for ranges here!
-        if (warning_range) {
-                mp_range_parsed tmp = mp_parse_range_string(warning_range);
-                if (tmp.error == MP_PARSING_SUCCES) {
-                        config.thresholds.warning = tmp.range;
-                        config.thresholds.warning_is_set = true;
-                } else {
-                        printf("Failed to parse warning range: %s", warning_range);
-                        exit(STATE_UNKNOWN);
-                }
-        }
+        option_char = optind;
 
-        if (critical_range) {
-                mp_range_parsed tmp = mp_parse_range_string(critical_range);
-                if (tmp.error == MP_PARSING_SUCCES) {
-                        config.thresholds.critical = tmp.range;
-                        config.thresholds.critical_is_set = true;
-                } else {
-                        printf("Failed to parse critical range: %s", critical_range);
-                        exit(STATE_UNKNOWN);
-                }
+        if (warning_range == NULL && argc > option_char)
+                warning_range = argv[option_char++];
+
+        if (critical_range == NULL && argc > option_char)
+                critical_range = argv[option_char++];
+
+        /* this will abort in case of invalid ranges */
+        set_thresholds(&thlds, warning_range, critical_range);
+
+        if (!thlds->warning) {
+                usage4(_("Warning threshold must be a valid range expression"));
         }
 
-        process_argument_wrapper result = {
-                .errorcode = OK,
-                .config = config,
-        };
+        if (!thlds->critical) {
+                usage4(_("Critical threshold must be a valid range expression"));
+        }
 
-        return result;
+        return OK;
 }
 
 void print_help(void) {
@@ -245,7 +257,6 @@ void print_help(void) {
         printf("    %s\n", _("Set WARNING status if number of logged in users violates RANGE_EXPRESSION"));
         printf(" %s\n", "-c, --critical=RANGE_EXPRESSION");
         printf("    %s\n", _("Set CRITICAL status if number of logged in users violates RANGE_EXPRESSION"));
-        printf(UT_OUTPUT_FORMAT);
 
         printf(UT_SUPPORT);
 }