[monitoring-plugins] check_smtp: add tests for --ssl

[Franz Schwartau]

 Module: monitoring-plugins
 Branch: master
 Commit: 06ebad83995921b622aecbd2111f1f6e6c62efc4
 Author: Franz Schwartau <franz at electromail.org>
   Date: Tue Aug 29 15:12:47 2023 +0200
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=06ebad8

check_smtp: add tests for --ssl

---

 .github/NPTest.cache      |  1 +
 .github/prepare_debian.sh |  6 +++++-
 plugins/t/check_smtp.t    | 20 +++++++++++++++++++-
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/.github/NPTest.cache b/.github/NPTest.cache
index e369457..d488d1b 100644
--- a/.github/NPTest.cache
+++ b/.github/NPTest.cache
@@ -27,6 +27,7 @@
   'NP_HOST_TCP_SMTP' => 'localhost',
   'NP_HOST_TCP_SMTP_NOSTARTTLS' => '',
   'NP_HOST_TCP_SMTP_STARTTLS' => 'localhost',
+  'NP_HOST_TCP_SMTP_TLS' => 'localhost',
   'NP_HOST_TLS_CERT' => 'localhost',
   'NP_HOST_TLS_HTTP' => 'localhost',
   'NP_HOST_UDP_TIME' => 'none',
diff --git a/.github/prepare_debian.sh b/.github/prepare_debian.sh
index 9611670..dcf778b 100755
--- a/.github/prepare_debian.sh
+++ b/.github/prepare_debian.sh
@@ -116,7 +116,11 @@ service snmpd start
 # start cron, will be used by check_nagios
 cron
 
-# start postfix
+# postfix
+cat <<EOD >> /etc/postfix/master.cf
+smtps     inet  n       -       n       -       -       smtpd
+  -o smtpd_tls_wrappermode=yes
+EOD
 service postfix start
 
 # start ftpd
diff --git a/plugins/t/check_smtp.t b/plugins/t/check_smtp.t
index fd09ed2..1a1ebe3 100644
--- a/plugins/t/check_smtp.t
+++ b/plugins/t/check_smtp.t
@@ -14,6 +14,8 @@ my $host_tcp_smtp_starttls   = getTestParameter( "NP_HOST_TCP_SMTP_STARTTLS",
 					   "A host providing SMTP with STARTTLS", $host_tcp_smtp);
 my $host_tcp_smtp_nostarttls = getTestParameter( "NP_HOST_TCP_SMTP_NOSTARTTLS",
 					   "A host providing SMTP without STARTTLS", "");
+my $host_tcp_smtp_tls        = getTestParameter( "NP_HOST_TCP_SMTP_TLS",
+					   "A host providing SMTP with TLS", $host_tcp_smtp);
 
 my $host_nonresponsive = getTestParameter( "NP_HOST_NONRESPONSIVE", 
 					   "The hostname of system not responsive to network requests", "10.0.0.1" );
@@ -22,7 +24,7 @@ my $hostname_invalid   = getTestParameter( "NP_HOSTNAME_INVALID",
                                            "An invalid (not known to DNS) hostname", "nosuchhost" );
 my $res;
 
-plan tests => 10;
+plan tests => 16;
 
 SKIP: {
 	skip "No SMTP server defined", 4 unless $host_tcp_smtp;
@@ -42,6 +44,10 @@ SKIP: {
 		local $TODO = "Output is over two lines";
 		like ( $res->output, qr/^SMTP WARNING/, "Correct error message" );
 	}
+
+	$res = NPTest->testCmd( "./check_smtp -H $host_tcp_smtp --ssl -p 25" );
+	is ($res->return_code, 2, "Check rc of connecting to $host_tcp_smtp with TLS on standard SMTP port" );
+	like ($res->output, qr/^CRITICAL - Cannot make SSL connection\./, "Check output of connecting to $host_tcp_smtp with TLS on standard SMTP port");
 }
 
 SKIP: {
@@ -58,6 +64,18 @@ SKIP: {
 	is ($res->output, "WARNING - TLS not supported by server", "Right error message" );
 }
 
+SKIP: {
+	skip "No SMTP server with TLS defined", 1 unless $host_tcp_smtp_tls;
+	$res = NPTest->testCmd( "./check_smtp -H $host_tcp_smtp_tls --ssl" );
+	is ($res->return_code, 0, "Check rc of connecting to $host_tcp_smtp_tls with TLS" );
+	like ($res->output, qr/^SMTP OK - /, "Check output of connecting to $host_tcp_smtp_tls with TLS" );
+
+	my $unused_port = 4465;
+	$res = NPTest->testCmd( "./check_smtp -H $host_tcp_smtp_tls -p $unused_port --ssl" );
+	is ($res->return_code, 2, "Check rc of connecting to $host_tcp_smtp_tls with TLS on unused port $unused_port" );
+	like ($res->output, qr/^connect to address $host_tcp_smtp_tls and port $unused_port: Connection refused/, "Check output of connecting to $host_tcp_smtp_tls with TLS on unused port $unused_port");
+}
+
 $res = NPTest->testCmd( "./check_smtp $host_nonresponsive" );
 is ($res->return_code, 2, "CRITICAL - host non responding" );