rule vars: support prefix

Support the detection engine's prefix when retrieving rule vars.

src/util-rule-vars.c

@@ -69,7 +69,7 @@ char *SCRuleVarsGetConfVar(const DetectEngineCtx *de_ctx,
     SCEnter();
 
     const char *conf_var_type_name = NULL;
-    char conf_var_full_name[1024] = "";
+    char conf_var_full_name[2048] = "";
     char *conf_var_full_name_value = NULL;
 
     if (conf_var_name == NULL)
@@ -80,9 +80,16 @@ char *SCRuleVarsGetConfVar(const DetectEngineCtx *de_ctx,
     if (conf_var_type_name == NULL)
         goto end;
 
-    if (snprintf(conf_var_full_name, sizeof(conf_var_full_name), "%s.%s",
-                 conf_var_type_name, conf_var_name) < 0) {
-        goto end;
+    if (de_ctx != NULL && strlen(de_ctx->config_prefix) > 0) {
+        if (snprintf(conf_var_full_name, sizeof(conf_var_full_name), "%s.%s.%s",
+                    de_ctx->config_prefix, conf_var_type_name, conf_var_name) < 0) {
+            goto end;
+        }
+    } else {
+        if (snprintf(conf_var_full_name, sizeof(conf_var_full_name), "%s.%s",
+                    conf_var_type_name, conf_var_name) < 0) {
+            goto end;
+        }
     }
 
     if (ConfGet(conf_var_full_name, &conf_var_full_name_value) != 1) {
@@ -423,16 +430,92 @@ end:
     return result;
 }
 
+static const char *dummy_mt_conf_string =
+    "%YAML 1.1\n"
+    "---\n"
+    "vars:\n"
+    "\n"
+    "  address-groups:\n"
+    "\n"
+    "    HOME_NET: \"[1.2.3.4]\"\n"
+    "  port-groups:\n"
+    "    HTTP_PORTS: \"12345\"\n"
+    "multi-detect:\n"
+    "  0:\n"
+    "    vars:\n"
+    "\n"
+    "      address-groups:\n"
+    "\n"
+    "        HOME_NET: \"[8.8.8.8]\"\n"
+    "      port-groups:\n"
+    "        HTTP_PORTS: \"54321\"\n"
+    "\n";
+
+/**
+ * \test Check that valid address and port group vars are correctly retrieved
+ *       from the configuration.
+ */
+int SCRuleVarsMTest01(void)
+{
+    int result = 0;
+    DetectEngineCtx *de_ctx = NULL;
+
+    ConfCreateContextBackup();
+    ConfInit();
+    ConfYamlLoadString(dummy_mt_conf_string, strlen(dummy_mt_conf_string));
+
+    if ( (de_ctx = DetectEngineCtxInit()) == NULL)
+        return 0;
+    de_ctx->flags |= DE_QUIET;
+    snprintf(de_ctx->config_prefix, sizeof(de_ctx->config_prefix),
+                "multi-detect.0");
+
+    /* check for address-groups */
+    result = (SCRuleVarsGetConfVar(de_ctx,"$HOME_NET", SC_RULE_VARS_ADDRESS_GROUPS) != NULL &&
+               strcmp(SCRuleVarsGetConfVar(de_ctx,"$HOME_NET", SC_RULE_VARS_ADDRESS_GROUPS),
+                      "[8.8.8.8]") == 0);
+    if (result == 0)
+        goto end;
+
+    result = (SCRuleVarsGetConfVar(NULL,"$HOME_NET", SC_RULE_VARS_ADDRESS_GROUPS) != NULL &&
+               strcmp(SCRuleVarsGetConfVar(NULL,"$HOME_NET", SC_RULE_VARS_ADDRESS_GROUPS),
+                      "[1.2.3.4]") == 0);
+    if (result == 0)
+        goto end;
+
+    /* check for port-groups */
+    result = (SCRuleVarsGetConfVar(de_ctx,"$HTTP_PORTS", SC_RULE_VARS_PORT_GROUPS) != NULL &&
+               strcmp(SCRuleVarsGetConfVar(de_ctx,"$HTTP_PORTS", SC_RULE_VARS_PORT_GROUPS),
+                      "54321") == 0);
+    if (result == 0)
+        goto end;
+
+    result = (SCRuleVarsGetConfVar(NULL,"$HTTP_PORTS", SC_RULE_VARS_PORT_GROUPS) != NULL &&
+               strcmp(SCRuleVarsGetConfVar(NULL,"$HTTP_PORTS", SC_RULE_VARS_PORT_GROUPS),
+                      "12345") == 0);
+    if (result == 0)
+        goto end;
+
+end:
+    ConfDeInit();
+    ConfRestoreContextBackup();
+
+    if (de_ctx != NULL)
+        DetectEngineCtxFree(de_ctx);
+    return result;
+}
+
 #endif /* UNITTESTS */
 
 void SCRuleVarsRegisterTests(void)
 {
-
 #ifdef UNITTESTS
     UtRegisterTest("SCRuleVarsPositiveTest01", SCRuleVarsPositiveTest01, 1);
     UtRegisterTest("SCRuleVarsNegativeTest02", SCRuleVarsNegativeTest02, 1);
     UtRegisterTest("SCRuleVarsPositiveTest03", SCRuleVarsPositiveTest03, 1);
     UtRegisterTest("SCRuleVarsNegativeTest04", SCRuleVarsNegativeTest04, 1);
+
+    UtRegisterTest("SCRuleVarsMTest01", SCRuleVarsMTest01, 1);
 #endif
 
     return;