--- /dev/null
+/* Test using "search ." in /etc/resolv.conf.
+ Copyright (C) 2026 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <netdb.h>
+#include <resolv.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <support/check.h>
+#include <support/check_nss.h>
+#include <support/namespace.h>
+#include <support/resolv_test.h>
+#include <support/support.h>
+
+/* Check that plain res_init loads the configuration as expected. */
+static void
+test_res_init (void *ignored)
+{
+ res_init ();
+ TEST_COMPARE_STRING (_res.dnsrch[0], ".");
+ TEST_COMPARE_STRING (_res.dnsrch[1], NULL);
+}
+
+static void
+response (const struct resolv_response_context *ctx,
+ struct resolv_response_builder *b,
+ const char *qname, uint16_t qclass, uint16_t qtype)
+{
+ TEST_VERIFY_EXIT (qclass == C_IN);
+ TEST_COMPARE (ctx->server_index, 0);
+
+ if (strncmp (qname, "does-not-exist", strlen ("does-not-exist")) == 0)
+ {
+ resolv_response_init (b, (struct resolv_response_flags)
+ { .rcode = ns_r_nxdomain });
+ resolv_response_add_question (b, qname, qclass, qtype);
+ return;
+ }
+
+ resolv_response_init (b, (struct resolv_response_flags) { });
+ resolv_response_add_question (b, qname, qclass, qtype);
+ resolv_response_section (b, ns_s_an);
+
+ resolv_response_open_record (b, qname, qclass, qtype, 0);
+ switch (qtype)
+ {
+ case T_A:
+ {
+ char ipv4[4] = {192, 0, 2, 17};
+ resolv_response_add_data (b, &ipv4, sizeof (ipv4));
+ }
+ break;
+ case T_AAAA:
+ {
+ char ipv6[16]
+ = {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
+ resolv_response_add_data (b, &ipv6, sizeof (ipv6));
+ }
+ break;
+ }
+ resolv_response_close_record (b);
+}
+
+static void
+check_h (const char *name, int family, const char *expected)
+{
+ if (family == AF_INET)
+ {
+ char *query = xasprintf ("gethostbyname (\"%s\")", name);
+ check_hostent (query, gethostbyname (name), expected);
+ free (query);
+ }
+ {
+ char *query = xasprintf ("gethostbyname2 (\"%s\", %d)", name, family);
+ check_hostent (query, gethostbyname2 (name, family), expected);
+ free (query);
+ }
+}
+
+static void
+check_ai (const char *name, int family, const char *expected)
+{
+ struct addrinfo hints = { .ai_family = family, .ai_socktype = SOCK_STREAM, };
+ struct addrinfo *ai;
+ char *query = xasprintf ("%s:80 [%d]", name, hints.ai_family);
+ int ret = getaddrinfo (name, "80", &hints, &ai);
+ check_addrinfo (query, ai, ret, expected);
+ if (ret == 0)
+ freeaddrinfo (ai);
+ free (query);
+}
+
+static int
+do_test (void)
+{
+ support_isolate_in_subprocess (test_res_init, NULL);
+
+ struct resolv_test *aux = resolv_test_start
+ ((struct resolv_redirect_config)
+ {
+ .response_callback = response,
+ .no_override_resolv_conf_search = true,
+ });
+
+ check_h ("www.example", AF_INET,
+ "name: www.example\n"
+ "address: 192.0.2.17\n");
+ check_h ("www.example", AF_INET6,
+ "name: www.example\n"
+ "address: 2001:db8::1\n");
+ check_ai ("www.example", AF_UNSPEC,
+ "address: STREAM/TCP 192.0.2.17 80\n"
+ "address: STREAM/TCP 2001:db8::1 80\n");
+ check_ai ("www.example", AF_INET,
+ "address: STREAM/TCP 192.0.2.17 80\n");
+ check_ai ("www.example", AF_INET6,
+ "address: STREAM/TCP 2001:db8::1 80\n");
+ check_h ("does-not-exist.example", AF_INET,
+ "error: HOST_NOT_FOUND\n");
+ check_h ("does-not-exist.example", AF_INET6,
+ "error: HOST_NOT_FOUND\n");
+ check_ai ("does-not-exist.example", AF_UNSPEC,
+ "error: Name or service not known\n");
+ check_ai ("does-not-exist.example", AF_INET,
+ "error: Name or service not known\n");
+ check_ai ("does-not-exist.example", AF_INET6,
+ "error: Name or service not known\n");
+
+ /* With trailing dot. */
+ check_h ("www.example.", AF_INET,
+ "name: www.example\n"
+ "address: 192.0.2.17\n");
+ check_h ("www.example.", AF_INET6,
+ "name: www.example\n"
+ "address: 2001:db8::1\n");
+ check_ai ("www.example.", AF_UNSPEC,
+ "address: STREAM/TCP 192.0.2.17 80\n"
+ "address: STREAM/TCP 2001:db8::1 80\n");
+ check_ai ("www.example.", AF_INET,
+ "address: STREAM/TCP 192.0.2.17 80\n");
+ check_ai ("www.example.", AF_INET6,
+ "address: STREAM/TCP 2001:db8::1 80\n");
+ check_h ("does-not-exist.example.", AF_INET,
+ "error: HOST_NOT_FOUND\n");
+ check_h ("does-not-exist.example.", AF_INET6,
+ "error: HOST_NOT_FOUND\n");
+ check_ai ("does-not-exist.example.", AF_UNSPEC,
+ "error: Name or service not known\n");
+ check_ai ("does-not-exist.example.", AF_INET,
+ "error: Name or service not known\n");
+ check_ai ("does-not-exist.example.", AF_INET6,
+ "error: Name or service not known\n");
+
+ resolv_test_end (aux);
+
+ return 0;
+}
+
+#include <support/test-driver.c>
projects / thirdparty / glibc.git / commitdiff
