1 files changed, 660 insertions, 0 deletions

diff --git a/lib/output.c b/lib/output.c
new file mode 100644
index 00000000..54d505d9
--- /dev/null
+++ b/lib/output.c
@@ -0,0 +1,660 @@
+#include "./output.h"
+#include "./utils_base.h"
+#include "../plugins/utils.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+// #include <cjson/cJSON.h>
+#include "./vendor/cJSON/cJSON.h"
+#include "perfdata.h"
+#include "states.h"
+
+// == Global variables
+static mp_output_format output_format = MP_FORMAT_DEFAULT;
+static mp_output_detail_level level_of_detail = MP_DETAIL_ALL;
+
+// == Prototypes ==
+static char *fmt_subcheck_output(mp_output_format output_format, mp_subcheck check,
+                                                                 unsigned int indentation);
+static inline cJSON *json_serialize_subcheck(mp_subcheck subcheck);
+
+// == Implementation ==
+
+/*
+ * Generate output string for a mp_subcheck object
+ */
+static inline char *fmt_subcheck_perfdata(mp_subcheck check) {
+        char *result = strdup("");
+        int added = 0;
+
+        if (check.perfdata != NULL) {
+                added = asprintf(&result, "%s", pd_list_to_string(*check.perfdata));
+        }
+
+        if (check.subchecks == NULL) {
+                // No subchecks, return here
+                return result;
+        }
+
+        mp_subcheck_list *subchecks = check.subchecks;
+
+        while (subchecks != NULL) {
+                if (added > 0) {
+                        added = asprintf(&result, "%s %s", result, fmt_subcheck_perfdata(subchecks->subcheck));
+                } else {
+                        // TODO free previous result here?
+                        added = asprintf(&result, "%s", fmt_subcheck_perfdata(subchecks->subcheck));
+                }
+
+                subchecks = subchecks->next;
+        }
+
+        return result;
+}
+
+/*
+ * Initialiser for a mp_check object. Always use this to get a new one!
+ * It sets useful defaults
+ */
+mp_check mp_check_init(void) {
+        mp_check check = {
+                .evaluation_function = &mp_eval_check_default,
+                .default_output_override = NULL,
+                .default_output_override_content = NULL,
+        };
+        return check;
+}
+
+/*
+ * Initialiser for a mp_subcheck object. Always use this to get a new one!
+ * It sets useful defaults
+ */
+mp_subcheck mp_subcheck_init(void) {
+        mp_subcheck tmp = {0};
+        tmp.default_state = STATE_UNKNOWN; // Default state is unknown
+        tmp.state_set_explicitly = false;
+        return tmp;
+}
+
+/*
+ * Add a subcheck to a (the one and only) check object
+ */
+int mp_add_subcheck_to_check(mp_check check[static 1], mp_subcheck subcheck) {
+        assert(subcheck.output != NULL); // There must be output in a subcheck
+
+        mp_subcheck_list *tmp = NULL;
+
+        if (check->subchecks == NULL) {
+                check->subchecks = (mp_subcheck_list *)calloc(1, sizeof(mp_subcheck_list));
+                if (check->subchecks == NULL) {
+                        die(STATE_UNKNOWN, "%s - %s #%d: %s", __FILE__, __func__, __LINE__, "malloc failed");
+                }
+
+                check->subchecks->subcheck = subcheck;
+                check->subchecks->next = NULL;
+        } else {
+                // Search for the end
+                tmp = (mp_subcheck_list *)calloc(1, sizeof(mp_subcheck_list));
+                if (tmp == NULL) {
+                        die(STATE_UNKNOWN, "%s - %s #%d: %s", __FILE__, __func__, __LINE__, "malloc failed");
+                }
+
+                tmp->subcheck = subcheck;
+                tmp->next = check->subchecks;
+
+                check->subchecks = tmp;
+        }
+
+        return 0;
+}
+
+/*
+ * Add a mp_perfdata data point to a mp_subcheck object
+ */
+void mp_add_perfdata_to_subcheck(mp_subcheck check[static 1], const mp_perfdata perfData) {
+        if (check->perfdata == NULL) {
+                check->perfdata = pd_list_init();
+        }
+        pd_list_append(check->perfdata, perfData);
+}
+
+/*
+ * Add a mp_subcheck object to another one. The seconde mp_subcheck (argument) is the lower in the
+ * hierarchy
+ */
+int mp_add_subcheck_to_subcheck(mp_subcheck check[static 1], mp_subcheck subcheck) {
+        if (subcheck.output == NULL) {
+                die(STATE_UNKNOWN, "%s - %s #%d: %s", __FILE__, __func__, __LINE__,
+                        "Sub check output is NULL");
+        }
+
+        mp_subcheck_list *tmp = NULL;
+
+        if (check->subchecks == NULL) {
+                check->subchecks = (mp_subcheck_list *)calloc(1, sizeof(mp_subcheck_list));
+                if (check->subchecks == NULL) {
+                        die(STATE_UNKNOWN, "%s - %s #%d: %s", __FILE__, __func__, __LINE__, "malloc failed");
+                }
+
+                tmp = check->subchecks;
+        } else {
+                // Search for the end
+                tmp = check->subchecks;
+
+                while (tmp->next != NULL) {
+                        tmp = tmp->next;
+                }
+
+                tmp->next = (mp_subcheck_list *)calloc(1, sizeof(mp_subcheck_list));
+                if (tmp->next == NULL) {
+                        die(STATE_UNKNOWN, "%s - %s #%d: %s", __FILE__, __func__, __LINE__, "malloc failed");
+                }
+
+                tmp = tmp->next;
+        }
+
+        tmp->subcheck = subcheck;
+
+        return 0;
+}
+
+/*
+ * Add a manual summary to a mp_check object, effectively replacing
+ * the autogenerated one
+ */
+void mp_add_summary(mp_check check[static 1], char *summary) { check->summary = summary; }
+
+/*
+ * Generate the summary string of a mp_check object based on its subchecks
+ */
+char *get_subcheck_summary(mp_check check) {
+        mp_subcheck_list *subchecks = check.subchecks;
+
+        unsigned int ok = 0;
+        unsigned int warning = 0;
+        unsigned int critical = 0;
+        unsigned int unknown = 0;
+        while (subchecks != NULL) {
+                switch (mp_compute_subcheck_state(subchecks->subcheck)) {
+                case STATE_OK:
+                        ok++;
+                        break;
+                case STATE_WARNING:
+                        warning++;
+                        break;
+                case STATE_CRITICAL:
+                        critical++;
+                        break;
+                case STATE_UNKNOWN:
+                        unknown++;
+                        break;
+                default:
+                        die(STATE_UNKNOWN, "Unknown state in get_subcheck_summary");
+                }
+                subchecks = subchecks->next;
+        }
+        char *result = NULL;
+        asprintf(&result, "ok=%d, warning=%d, critical=%d, unknown=%d", ok, warning, critical, unknown);
+        return result;
+}
+
+mp_state_enum mp_compute_subcheck_state(const mp_subcheck subcheck) {
+        if (subcheck.evaluation_function == NULL) {
+                return mp_eval_subcheck_default(subcheck);
+        }
+        return subcheck.evaluation_function(subcheck);
+}
+
+/*
+ * Generate the result state of a mp_subcheck object based on its own state and its subchecks
+ * states
+ */
+mp_state_enum mp_eval_subcheck_default(mp_subcheck subcheck) {
+        if (subcheck.evaluation_function != NULL) {
+                return subcheck.evaluation_function(subcheck);
+        }
+
+        if (subcheck.state_set_explicitly) {
+                return subcheck.state;
+        }
+
+        mp_subcheck_list *scl = subcheck.subchecks;
+
+        if (scl == NULL) {
+                return subcheck.default_state;
+        }
+
+        mp_state_enum result = STATE_OK;
+
+        while (scl != NULL) {
+                result = max_state_alt(result, mp_compute_subcheck_state(scl->subcheck));
+                scl = scl->next;
+        }
+
+        return result;
+}
+
+mp_state_enum mp_compute_check_state(const mp_check check) {
+        // just a safety check
+        if (check.evaluation_function == NULL) {
+                return mp_eval_check_default(check);
+        }
+        return check.evaluation_function(check);
+}
+
+/*
+ * Generate the result state of a mp_check object based on its own state and its subchecks states
+ */
+mp_state_enum mp_eval_check_default(const mp_check check) {
+        assert(check.subchecks != NULL); // a mp_check without subchecks is invalid, die here
+
+        mp_subcheck_list *scl = check.subchecks;
+        mp_state_enum result = STATE_OK;
+
+        while (scl != NULL) {
+                result = max_state_alt(result, mp_compute_subcheck_state(scl->subcheck));
+                scl = scl->next;
+        }
+
+        return result;
+}
+
+// Remove troublesome symbols from plugin output
+char *sanitize_output_insitu(char *input) {
+        if (input == NULL) {
+                return input;
+        }
+
+        for (char *walker = input; *walker != '\0'; walker++) {
+                if (*walker == '|') {
+                        *walker = ' ';
+                }
+        }
+
+        return input;
+}
+
+/*
+ * Generate output string for a mp_check object
+ * Non static to be available for testing functions
+ */
+char *mp_fmt_output(mp_check check) {
+        char *result = NULL;
+
+        switch (output_format) {
+        case MP_FORMAT_MULTI_LINE: {
+                if (check.default_output_override != NULL) {
+                        result = check.default_output_override(check.default_output_override_content);
+                        break;
+                }
+
+                if (check.summary == NULL) {
+                        check.summary = get_subcheck_summary(check);
+                }
+
+                asprintf(&result, "[%s] - %s", state_text(mp_compute_check_state(check)), check.summary);
+
+                mp_subcheck_list *subchecks = check.subchecks;
+
+                while (subchecks != NULL) {
+                        if (level_of_detail == MP_DETAIL_ALL ||
+                                mp_compute_subcheck_state(subchecks->subcheck) != STATE_OK) {
+                                asprintf(&result, "%s\n%s", result,
+                                                 fmt_subcheck_output(MP_FORMAT_MULTI_LINE, subchecks->subcheck, 1));
+                        }
+                        subchecks = subchecks->next;
+                }
+
+                char *pd_string = NULL;
+                subchecks = check.subchecks;
+
+                while (subchecks != NULL) {
+                        if (pd_string == NULL) {
+                                asprintf(&pd_string, "%s", fmt_subcheck_perfdata(subchecks->subcheck));
+                        } else {
+                                asprintf(&pd_string, "%s %s", pd_string,
+                                                 fmt_subcheck_perfdata(subchecks->subcheck));
+                        }
+
+                        subchecks = subchecks->next;
+                }
+
+                result = sanitize_output_insitu(result);
+
+                if (pd_string != NULL && strlen(pd_string) > 0) {
+                        asprintf(&result, "%s|%s", result, pd_string);
+                }
+
+                break;
+        }
+        case MP_FORMAT_TEST_JSON: {
+                cJSON *resultObject = cJSON_CreateObject();
+                if (resultObject == NULL) {
+                        die(STATE_UNKNOWN, "cJSON_CreateObject failed");
+                }
+
+                cJSON *resultState = cJSON_CreateString(state_text(mp_compute_check_state(check)));
+                cJSON_AddItemToObject(resultObject, "state", resultState);
+
+                if (check.summary == NULL) {
+                        check.summary = get_subcheck_summary(check);
+                }
+
+                cJSON *summary = cJSON_CreateString(check.summary);
+                cJSON_AddItemToObject(resultObject, "summary", summary);
+
+                if (check.subchecks != NULL) {
+                        cJSON *subchecks = cJSON_CreateArray();
+
+                        mp_subcheck_list *sc = check.subchecks;
+
+                        while (sc != NULL) {
+                                cJSON *sc_json = json_serialize_subcheck(sc->subcheck);
+                                cJSON_AddItemToArray(subchecks, sc_json);
+                                sc = sc->next;
+                        }
+
+                        cJSON_AddItemToObject(resultObject, "checks", subchecks);
+                }
+
+                result = cJSON_PrintUnformatted(resultObject);
+                break;
+        }
+        default:
+                die(STATE_UNKNOWN, "Invalid format");
+        }
+
+        return result;
+}
+
+/*
+ * Helper function to properly indent the output lines when using multiline
+ * formats
+ */
+static char *generate_indentation_string(unsigned int indentation) {
+        char *result = calloc(indentation + 1, sizeof(char));
+
+        for (unsigned int i = 0; i < indentation; i++) {
+                result[i] = '\t';
+        }
+
+        return result;
+}
+
+/*
+ * Helper function to generate the output string of mp_subcheck
+ */
+static inline char *fmt_subcheck_output(mp_output_format output_format, mp_subcheck check,
+                                                                                unsigned int indentation) {
+        char *result = NULL;
+        mp_subcheck_list *subchecks = NULL;
+
+        switch (output_format) {
+        case MP_FORMAT_MULTI_LINE: {
+                char *tmp_string = NULL;
+                if ((tmp_string = strchr(check.output, '\n')) != NULL) {
+                        // This is a multiline string, put the correct indentation in before proceeding
+                        char *intermediate_string = "";
+                        bool have_residual_chars = false;
+
+                        while (tmp_string != NULL) {
+                                *tmp_string = '\0';
+                                asprintf(&intermediate_string, "%s%s\n%s", intermediate_string, check.output,
+                                                 generate_indentation_string(
+                                                         indentation + 1)); // one more indentation to make it look better
+
+                                if (*(tmp_string + 1) != '\0') {
+                                        check.output = tmp_string + 1;
+                                        have_residual_chars = true;
+                                } else {
+                                        // Null after the \n, so this is the end
+                                        have_residual_chars = false;
+                                        break;
+                                }
+
+                                tmp_string = strchr(check.output, '\n');
+                        }
+
+                        // add the rest (if any)
+                        if (have_residual_chars) {
+                                char *tmp = check.output;
+                                xasprintf(&check.output, "%s\n%s%s", intermediate_string,
+                                                  generate_indentation_string(indentation + 1), tmp);
+                        } else {
+                                check.output = intermediate_string;
+                        }
+                }
+                asprintf(&result, "%s\\_[%s] - %s", generate_indentation_string(indentation),
+                                 state_text(mp_compute_subcheck_state(check)), check.output);
+
+                subchecks = check.subchecks;
+
+                while (subchecks != NULL) {
+                        asprintf(&result, "%s\n%s", result,
+                                         fmt_subcheck_output(output_format, subchecks->subcheck, indentation + 1));
+                        subchecks = subchecks->next;
+                }
+                return result;
+        }
+        default:
+                die(STATE_UNKNOWN, "Invalid format");
+        }
+}
+
+static inline cJSON *json_serialise_pd_value(mp_perfdata_value value) {
+        cJSON *result = cJSON_CreateObject();
+
+        switch (value.type) {
+        case PD_TYPE_DOUBLE:
+                cJSON_AddStringToObject(result, "type", "double");
+                break;
+        case PD_TYPE_INT:
+                cJSON_AddStringToObject(result, "type", "int");
+                break;
+        case PD_TYPE_UINT:
+                cJSON_AddStringToObject(result, "type", "uint");
+                break;
+        case PD_TYPE_NONE:
+                die(STATE_UNKNOWN, "Perfdata type was None in json_serialise_pd_value");
+        }
+        cJSON_AddStringToObject(result, "value", pd_value_to_string(value));
+
+        return result;
+}
+
+static inline cJSON *json_serialise_range(mp_range range) {
+        cJSON *result = cJSON_CreateObject();
+
+        if (range.alert_on_inside_range) {
+                cJSON_AddBoolToObject(result, "alert_on_inside", true);
+        } else {
+                cJSON_AddBoolToObject(result, "alert_on_inside", false);
+        }
+
+        if (range.end_infinity) {
+                cJSON_AddStringToObject(result, "end", "inf");
+        } else {
+                cJSON_AddItemToObject(result, "end", json_serialise_pd_value(range.end));
+        }
+
+        if (range.start_infinity) {
+                cJSON_AddStringToObject(result, "start", "inf");
+        } else {
+                cJSON_AddItemToObject(result, "start", json_serialise_pd_value(range.end));
+        }
+
+        return result;
+}
+
+static inline cJSON *json_serialise_pd(mp_perfdata pd_val) {
+        cJSON *result = cJSON_CreateObject();
+
+        // Label
+        cJSON_AddStringToObject(result, "label", pd_val.label);
+
+        // Value
+        cJSON_AddItemToObject(result, "value", json_serialise_pd_value(pd_val.value));
+
+        // Uom
+        cJSON_AddStringToObject(result, "uom", pd_val.uom);
+
+        // Warn/Crit
+        if (pd_val.warn_present) {
+                cJSON *warn = json_serialise_range(pd_val.warn);
+                cJSON_AddItemToObject(result, "warn", warn);
+        }
+        if (pd_val.crit_present) {
+                cJSON *crit = json_serialise_range(pd_val.crit);
+                cJSON_AddItemToObject(result, "crit", crit);
+        }
+
+        if (pd_val.min_present) {
+                cJSON_AddItemToObject(result, "min", json_serialise_pd_value(pd_val.min));
+        }
+        if (pd_val.max_present) {
+                cJSON_AddItemToObject(result, "max", json_serialise_pd_value(pd_val.max));
+        }
+
+        return result;
+}
+
+static inline cJSON *json_serialise_pd_list(pd_list *list) {
+        cJSON *result = cJSON_CreateArray();
+
+        do {
+                cJSON *pd_value = json_serialise_pd(list->data);
+                cJSON_AddItemToArray(result, pd_value);
+                list = list->next;
+        } while (list != NULL);
+
+        return result;
+}
+
+static inline cJSON *json_serialize_subcheck(mp_subcheck subcheck) {
+        cJSON *result = cJSON_CreateObject();
+
+        // Human readable output
+        cJSON *output = cJSON_CreateString(subcheck.output);
+        cJSON_AddItemToObject(result, "output", output);
+
+        // Test state (aka Exit Code)
+        cJSON *state = cJSON_CreateString(state_text(mp_compute_subcheck_state(subcheck)));
+        cJSON_AddItemToObject(result, "state", state);
+
+        // Perfdata
+        if (subcheck.perfdata != NULL) {
+                cJSON *perfdata = json_serialise_pd_list(subcheck.perfdata);
+                cJSON_AddItemToObject(result, "perfdata", perfdata);
+        }
+
+        if (subcheck.subchecks != NULL) {
+                cJSON *subchecks = cJSON_CreateArray();
+
+                mp_subcheck_list *sc = subcheck.subchecks;
+
+                while (sc != NULL) {
+                        cJSON *sc_json = json_serialize_subcheck(sc->subcheck);
+                        cJSON_AddItemToArray(subchecks, sc_json);
+                        sc = sc->next;
+                }
+
+                cJSON_AddItemToObject(result, "checks", subchecks);
+        }
+
+        return result;
+}
+
+/*
+ * Wrapper function to print the output string of a mp_check object
+ * Use this in concrete plugins.
+ */
+void mp_print_output(mp_check check) { puts(mp_fmt_output(check)); }
+
+/*
+ * Convenience function to print the output string of a mp_check object and exit
+ * the program with the resulting state.
+ * Intended to be used to exit a monitoring plugin.
+ */
+void mp_exit(mp_check check) {
+        mp_print_output(check);
+        if (output_format == MP_FORMAT_TEST_JSON) {
+                exit(0);
+        }
+
+        exit(mp_compute_check_state(check));
+}
+
+/*
+ * Function to set the result state of a mp_subcheck object explicitly.
+ * This will overwrite the default state AND states derived from it's subchecks
+ */
+mp_subcheck mp_set_subcheck_state(mp_subcheck check, mp_state_enum state) {
+        check.state = state;
+        check.state_set_explicitly = true;
+        return check;
+}
+
+/*
+ * Function to set the default result state of a mp_subcheck object. This state
+ * will be used if neither an explicit state is set (see *mp_set_subcheck_state*)
+ * nor does it include other subchecks
+ */
+mp_subcheck mp_set_subcheck_default_state(mp_subcheck check, mp_state_enum state) {
+        check.default_state = state;
+        return check;
+}
+
+char *mp_output_format_map[] = {
+        [MP_FORMAT_MULTI_LINE] = "multi-line",
+        [MP_FORMAT_TEST_JSON] = "mp-test-json",
+};
+
+/*
+ * Function to parse the output from a string
+ */
+parsed_output_format mp_parse_output_format(char *format_string) {
+        parsed_output_format result = {
+                .parsing_success = false,
+                .output_format = MP_FORMAT_DEFAULT,
+        };
+
+        for (mp_output_format i = 0; i < (sizeof(mp_output_format_map) / sizeof(char *)); i++) {
+                if (strcasecmp(mp_output_format_map[i], format_string) == 0) {
+                        result.parsing_success = true;
+                        result.output_format = i;
+                        break;
+                }
+        }
+
+        return result;
+}
+
+void mp_set_format(mp_output_format format) { output_format = format; }
+
+mp_output_format mp_get_format(void) { return output_format; }
+
+void mp_set_level_of_detail(mp_output_detail_level level) { level_of_detail = level; }
+
+mp_output_detail_level mp_get_level_of_detail(void) { return level_of_detail; }
+
+mp_state_enum mp_eval_ok(mp_check overall) {
+        (void)overall;
+        return STATE_OK;
+}
+
+mp_state_enum mp_eval_warning(mp_check overall) {
+        (void)overall;
+        return STATE_WARNING;
+}
+
+mp_state_enum mp_eval_critical(mp_check overall) {
+        (void)overall;
+        return STATE_CRITICAL;
+}
+
+mp_state_enum mp_eval_unknown(mp_check overall) {
+        (void)overall;
+        return STATE_UNKNOWN;
+}