Merge pull request #2144 from RincewindsHat/refactor/check_snmp

Refactor check snmp:
 - Switch from executing `snmpget`/`snmpgetnext` to linking directly agains net-snmp
 - Refactor to use test abstraction -> allows for JSON output

1 files changed, 81 insertions, 0 deletions

diff --git a/plugins/check_snmp.d/config.h b/plugins/check_snmp.d/config.h
new file mode 100644
index 00000000..e7b6d1b3
--- /dev/null
+++ b/plugins/check_snmp.d/config.h
@@ -0,0 +1,81 @@
+#pragma once
+
+#include "../../lib/thresholds.h"
+#include "../../lib/states.h"
+#include <stdlib.h>
+#include <stdbool.h>
+#include <regex.h>
+#include "../common.h"
+
+// defines for snmp libs
+#define u_char  unsigned char
+#define u_long  unsigned long
+#define u_short unsigned short
+#define u_int   unsigned int
+
+#include <net-snmp/net-snmp-config.h>
+#include <net-snmp/net-snmp-includes.h>
+#include <net-snmp/library/snmp.h>
+#include <net-snmp/session_api.h>
+
+#define DEFAULT_PORT    "161"
+#define DEFAULT_RETRIES 5
+
+typedef struct eval_method {
+        bool crit_string;
+        bool crit_regex;
+} eval_method;
+
+typedef struct check_snmp_test_unit {
+        char *oid;
+        char *label;
+        char *unit_value;
+        eval_method eval_mthd;
+        mp_thresholds threshold;
+} check_snmp_test_unit;
+
+typedef struct {
+        struct snmp_session snmp_session;
+        // use getnet instead of get
+        bool use_getnext;
+
+        // TODO actually make these useful
+        bool ignore_mib_parsing_errors;
+        bool need_mibs;
+
+        check_snmp_test_unit *test_units;
+        size_t num_of_test_units;
+} check_snmp_config_snmp_parameters;
+
+typedef struct {
+        // State if an empty value is encountered
+        mp_state_enum nulloid_result;
+
+        // String evaluation stuff
+        bool invert_search;
+        regex_t regex_cmp_value; // regex to match query results against
+        char string_cmp_value[MAX_INPUT_BUFFER];
+
+        // Modify data
+        double multiplier;
+        bool multiplier_set;
+        double offset;
+        bool offset_set;
+
+        // Modify output
+        bool use_oid_as_perf_data_label;
+
+        // activate rate calculation
+        bool calculate_rate;
+        unsigned int rate_multiplier;
+} check_snmp_evaluation_parameters;
+
+typedef struct check_snmp_config {
+        // SNMP session to use
+        check_snmp_config_snmp_parameters snmp_params;
+
+        check_snmp_evaluation_parameters evaluation_params;
+
+        mp_output_format output_format;
+        bool output_format_is_set;
+} check_snmp_config;