Improves the accuracy of version identification on status calls

Trying to differentiate among IIS, Apache, NGINX, and Standalone builds.

apache2/msc_status_engine.c

@@ -349,8 +349,10 @@ int DSOLOCAL msc_beacon_string (char *beacon_string, int beacon_string_max_len)
 #endif
     libxml = LIBXML_DOTTED_VERSION;
     modsec = MODSEC_VERSION;
-#ifdef IIS_VERSION
+#ifdef VERSION_IIS
     apache = "IIS";
+#elif VERSION_NGINX
+    apache = "nginx";
 #else
     apache = real_server_signature;
 #endif

tests/regression/misc/20-status-engine.t

@@ -70,4 +70,54 @@
 		"arg1=val1&arg2=val2",
 	),
 },
+# On and SecServerSignature
+{
+	type => "misc",
+	comment => "SecStatusEngine On/SecServerSignature - checking signature",
+	conf => qq(
+		SecRuleEngine On
+		SecServerSignature "SpiderServer v0.1a"
+		SecStatusEngine On
+	),
+	match_log => {
+		error => {
+			apache => [ qr/StatusEngine call: \"[0-9]+.[0-9]+.[0-9]+[-RC]*[0-9]*\,Apache/, 1],
+			nginx => [ qr/StatusEngine call: \"[0-9]+.[0-9]+.[0-9]+[-RC]*[0-9]*\,nginx/, 1],
+		}
+	},
+	match_response => {
+		status => qr/^200$/,
+	},
+	request => new HTTP::Request(
+		POST => "http://$ENV{SERVER_NAME}:$ENV{SERVER_PORT}/test.txt",
+		[
+			"Content-Type" => "application/x-www-form-urlencoded",
+		],
+		"arg1=val1&arg2=val2",
+	),
+},
+# On and SecServerSignature
+{
+	type => "misc",
+	comment => "SecStatusEngine On - checking signature",
+	conf => qq(
+		SecStatusEngine On
+	),
+	match_log => {
+		error => {
+			apache => [ qr/StatusEngine call: \"[0-9]+.[0-9]+.[0-9]+[-RC]*[0-9]*\,Apache/, 1],
+			nginx => [ qr/StatusEngine call: \"[0-9]+.[0-9]+.[0-9]+[-RC]*[0-9]*\,nginx/, 1],
+		}
+	},
+	match_response => {
+		status => qr/^200$/,
+	},
+	request => new HTTP::Request(
+		POST => "http://$ENV{SERVER_NAME}:$ENV{SERVER_PORT}/test.txt",
+		[
+			"Content-Type" => "application/x-www-form-urlencoded",
+		],
+		"arg1=val1&arg2=val2",
+	),
+},