[monitoring-plugins] check_snmp: fix performance thresholds when using ...

[Sven Nierlein]

    Module: monitoring-plugins
    Branch: master
    Commit: 024d268386353133af1a9ff5c0b5879397c19b1c
    Author: Sven Nierlein <sven at nierlein.de>
 Committer: Sven Nierlein <sven at nierlein.org>
      Date: Wed Nov 17 11:58:41 2021 +0100
       URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=024d268

check_snmp: fix performance thresholds when using multiple oids

when using check_snmp with multiple oids it simply printed the unparsed content
from -w/-c into the thresholds for each oid. So each oid contained the hole -w
from all oids.

./check_snmp ... -o iso.3.6.1.2.1.25.1.3.0,iso.3.6.1.2.1.25.1.5.0 -w '1,2' -c '3,4'

before:
  SNMP ... | HOST-RESOURCES-MIB::hrSystemInitialLoadDevice.0=393216;1,2;3,4 HOST-RESOURCES-MIB::hrSystemNumUsers.0=24;1,2;3,4

after:
  SNMP ... | HOST-RESOURCES-MIB::hrSystemInitialLoadDevice.0=393216;1;3 HOST-RESOURCES-MIB::hrSystemNumUsers.0=24;2;4

This also applies to fixed thresholds since check_snmp translates negative infinities from: '~:-1' to '@-1:~'

---

 lib/utils_base.c           |  2 +-
 lib/utils_base.h           |  1 +
 plugins/check_snmp.c       |  9 +++++++--
 plugins/tests/check_snmp.t | 17 ++++++++++++++---
 4 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/lib/utils_base.c b/lib/utils_base.c
index fd7058d..08fa215 100644
--- a/lib/utils_base.c
+++ b/lib/utils_base.c
@@ -128,6 +128,7 @@ range
 	temp_range->end = 0;
 	temp_range->end_infinity = TRUE;
 	temp_range->alert_on = OUTSIDE;
+	temp_range->text = strdup(str);
 
 	if (str[0] == '@') {
 		temp_range->alert_on = INSIDE;
@@ -706,4 +707,3 @@ void np_state_write_string(time_t data_time, char *data_string) {
 
 	np_free(temp_file);
 }
-
diff --git a/lib/utils_base.h b/lib/utils_base.h
index d7e7dff..9482f23 100644
--- a/lib/utils_base.h
+++ b/lib/utils_base.h
@@ -23,6 +23,7 @@ typedef struct range_struct {
 	double	end;
 	int	end_infinity;
 	int	alert_on;		/* OUTSIDE (default) or INSIDE */
+	char* text; /* original unparsed text input */
 	} range;
 
 typedef struct thresholds_struct {
diff --git a/plugins/check_snmp.c b/plugins/check_snmp.c
index afc568b..58d46b1 100644
--- a/plugins/check_snmp.c
+++ b/plugins/check_snmp.c
@@ -468,6 +468,9 @@ main (int argc, char **argv)
 		/* Process this block for numeric comparisons */
 		/* Make some special values,like Timeticks numeric only if a threshold is defined */
 		if (thlds[i]->warning || thlds[i]->critical || calculate_rate) {
+			if (verbose > 2) {
+				print_thresholds("  thresholds", thlds[i]);
+			}
 			ptr = strpbrk (show, "-0123456789");
 			if (ptr == NULL)
 				die (STATE_UNKNOWN,_("No valid data returned (%s)\n"), show);
@@ -581,14 +584,16 @@ main (int argc, char **argv)
 
 			if (warning_thresholds) {
 				strncat(perfstr, ";", sizeof(perfstr)-strlen(perfstr)-1);
-				strncat(perfstr, warning_thresholds, sizeof(perfstr)-strlen(perfstr)-1);
+				if(thlds[i]->warning && thlds[i]->warning->text)
+					strncat(perfstr, thlds[i]->warning->text, sizeof(perfstr)-strlen(perfstr)-1);
 			}
 
 			if (critical_thresholds) {
 				if (!warning_thresholds)
 					strncat(perfstr, ";", sizeof(perfstr)-strlen(perfstr)-1);
 				strncat(perfstr, ";", sizeof(perfstr)-strlen(perfstr)-1);
-				strncat(perfstr, critical_thresholds, sizeof(perfstr)-strlen(perfstr)-1);
+				if(thlds[i]->critical && thlds[i]->critical->text)
+					strncat(perfstr, thlds[i]->critical->text, sizeof(perfstr)-strlen(perfstr)-1);
 			}
 
 			strncat(perfstr, " ", sizeof(perfstr)-strlen(perfstr)-1);
diff --git a/plugins/tests/check_snmp.t b/plugins/tests/check_snmp.t
index 85d6bf5..0a77fa8 100755
--- a/plugins/tests/check_snmp.t
+++ b/plugins/tests/check_snmp.t
@@ -9,7 +9,7 @@ use NPTest;
 use FindBin qw($Bin);
 use POSIX qw/strftime/;
 
-my $tests = 67;
+my $tests = 73;
 # Check that all dependent modules are available
 eval {
 	require NetSNMP::OID;
@@ -251,9 +251,20 @@ is($res->output, 'SNMP CRITICAL - *-4* | iso.3.6.1.4.1.8072.3.2.67.17=-4;-2:;-3:
 
 $res = NPTest->testCmd( "./check_snmp -H 127.0.0.1 -C public -p $port_snmp -o .1.3.6.1.4.1.8072.3.2.67.18 -c '~:-6.5'" );
 is($res->return_code, 0, "Negative float OK" );
-is($res->output, 'SNMP OK - -6.6 | iso.3.6.1.4.1.8072.3.2.67.18=-6.6;;~:-6.5 ', "Negative float OK output" );
+is($res->output, 'SNMP OK - -6.6 | iso.3.6.1.4.1.8072.3.2.67.18=-6.6;;@-6.5:~ ', "Negative float OK output" );
 
 $res = NPTest->testCmd( "./check_snmp -H 127.0.0.1 -C public -p $port_snmp -o .1.3.6.1.4.1.8072.3.2.67.18 -w '~:-6.65' -c '~:-6.55'" );
 is($res->return_code, 1, "Negative float WARNING" );
-is($res->output, 'SNMP WARNING - *-6.6* | iso.3.6.1.4.1.8072.3.2.67.18=-6.6;~:-6.65;~:-6.55 ', "Negative float WARNING output" );
+is($res->output, 'SNMP WARNING - *-6.6* | iso.3.6.1.4.1.8072.3.2.67.18=-6.6;@-6.65:~;@-6.55:~ ', "Negative float WARNING output" );
 
+$res = NPTest->testCmd( "./check_snmp -H 127.0.0.1 -C public -p $port_snmp -o .1.3.6.1.4.1.8072.3.2.67.10,.1.3.6.1.4.1.8072.3.2.67.17 -w '1:100000,-10:20' -c '2:200000,-20:30'" );
+is($res->return_code, 0, "Multiple OIDs with thresholds" );
+like($res->output, '/SNMP OK - \d+ -4 | iso.3.6.1.4.1.8072.3.2.67.10=\d+c;1:100000;2:200000 iso.3.6.1.4.1.8072.3.2.67.17=-4;-10:20;-20:30/', "Multiple OIDs with thresholds output" );
+
+$res = NPTest->testCmd( "./check_snmp -H 127.0.0.1 -C public -p $port_snmp -o .1.3.6.1.4.1.8072.3.2.67.10,.1.3.6.1.4.1.8072.3.2.67.17 -w '1:100000,-1:2' -c '2:200000,-20:30'" );
+is($res->return_code, 1, "Multiple OIDs with thresholds" );
+like($res->output, '/SNMP WARNING - \d+ \*-4\* | iso.3.6.1.4.1.8072.3.2.67.10=\d+c;1:100000;2:200000 iso.3.6.1.4.1.8072.3.2.67.17=-4;-10:20;-20:30/', "Multiple OIDs with thresholds output" );
+
+$res = NPTest->testCmd( "./check_snmp -H 127.0.0.1 -C public -p $port_snmp -o .1.3.6.1.4.1.8072.3.2.67.10,.1.3.6.1.4.1.8072.3.2.67.17 -w 1,2 -c 1" );
+is($res->return_code, 2, "Multiple OIDs with some thresholds" );
+like($res->output, '/SNMP CRITICAL - \*\d+\* \*-4\* | iso.3.6.1.4.1.8072.3.2.67.10=\d+c;1;2 iso.3.6.1.4.1.8072.3.2.67.17=-4;;/', "Multiple OIDs with thresholds output" );