1 files changed, 81 insertions, 0 deletions
diff --git a/tests/lib/test_resolver.c b/tests/lib/test_resolver.c
new file mode 100644
index 0000000..6a582cc
--- /dev/null
+++ b/tests/lib/test_resolver.c
@@ -0,0 +1,81 @@
+/*
+ * FRR c-ares integration test
+ * Copyright (C) 2021  David Lamparter for NetDEF, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/* this test is not run automatically since tests MUST NOT rely on any outside
+ * state.  DNS is most definitely "outside state".  A testbed may not have any
+ * internet connectivity at all.  It may not have working DNS.  Or worst of
+ * all, whatever name we use to test may have a temporary failure entirely
+ * beyond our control.
+ *
+ * The only way this test could be run in a testbed is with an all-local DNS
+ * setup, which considering the resolver code is rarely touched is not worth
+ * the time at all.  Instead, after touching the resolver code, manually run
+ * this test and throw some names at it.
+ */
+
+#include <zebra.h>
+
+#include "vty.h"
+#include "command.h"
+#include "resolver.h"
+#include "log.h"
+#include "sockunion.h"
+
+#include "tests/lib/cli/common_cli.h"
+
+extern struct thread_master *master;
+
+static void resolver_result(struct resolver_query *resq, const char *errstr,
+			    int numaddrs, union sockunion *addr)
+{
+	int i;
+
+	if (numaddrs <= 0) {
+		zlog_warn("hostname resolution failed: %s", errstr);
+		return;
+	}
+
+	for (i = 0; i < numaddrs; i++)
+		zlog_info("resolver result: %pSU", &addr[i]);
+}
+
+struct resolver_query query;
+
+DEFUN (test_resolve,
+       test_resolve_cmd,
+       "resolve WORD",
+       "DNS resolver\n"
+       "Name to resolve\n")
+{
+	resolver_resolve(&query, AF_UNSPEC, 0, argv[1]->arg, resolver_result);
+	return CMD_SUCCESS;
+}
+
+__attribute__((_CONSTRUCTOR(2000)))
+static void test_setup(void)
+{
+	test_log_prio = LOG_DEBUG;
+}
+
+void test_init(int argc, char **argv)
+{
+	resolver_init(master);
+
+	install_element(VIEW_NODE, &test_resolve_cmd);
+}