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This patch adds two tests that verify correct behavior of getaddrinfo when DNS resolution fails with a temporary error. Both tests ensure that getaddrinfo returns EAI_AGAIN in cases where no valid address can be resolved due to network or resolver failure. * tst-getaddrinfo-eai-again.c Runs inside the glibc test-container without any DNS server configured. The test performs queries using AF_INET, AF_INET6, and AF_UNSPEC and verifies that getaddrinfo returns EAI_AGAIN when resolution fails. * tst-getaddrinfo-eai-again-timeout.c Runs outside of the container but uses the resolv_test framework to simulate network failures. The test covers two failure modes: - No response from the server (resolv_response_drop) - Zero-length reply from the server In both cases, getaddrinfo is expected to return EAI_AGAIN. Reviewed-by: Florian Weimer <fweimer@redhat.com>
123 lines
3.7 KiB
C
123 lines
3.7 KiB
C
/* Test for BZ #16849. Verify that getaddrinfo correctly returns
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EAI_AGAIN when DNS resolution fails due to timeout or malformed
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responses.
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This test uses two simulated failure modes:
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- The DNS server does not respond at all (resolv_response_drop).
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- The DNS server responds with a zero-length packet.
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Copyright (C) 2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <netdb.h>
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#include <resolv.h>
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#include <stdbool.h>
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#include <support/check.h>
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#include <support/resolv_test.h>
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/* Track whether the callbacks were actually invoked. */
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static volatile bool response_called_drop = false;
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static volatile bool response_called_zero_len = false;
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/* Simulate a DNS server that sends a zero-length response. */
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static void
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response_zero_len (const struct resolv_response_context *ctx,
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struct resolv_response_builder *b,
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const char *qname, uint16_t qclass, uint16_t qtype)
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{
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response_called_zero_len = true;
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/* Do nothing — zero-length reply. */
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}
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/* Simulate a DNS server that drops the request. */
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static void
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response_drop (const struct resolv_response_context *ctx,
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struct resolv_response_builder *b,
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const char *qname, uint16_t qclass, uint16_t qtype)
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{
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response_called_drop = true;
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resolv_response_drop (b);
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}
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/* Query getaddrinfo for multiple families and expect EAI_AGAIN. */
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static void
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query_host (const char *host_name)
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{
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int family[] = { AF_INET, AF_INET6, AF_UNSPEC };
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const char *family_names[] = { "AF_INET", "AF_INET6", "AF_UNSPEC" };
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for (int i = 0; i < 3; i++)
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{
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struct addrinfo hints =
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{
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.ai_socktype = 0,
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.ai_protocol = 0,
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.ai_family = family[i],
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.ai_flags = 0,
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};
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struct addrinfo *result;
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int res = getaddrinfo (host_name, NULL, &hints, &result);
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if (res != EAI_AGAIN)
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FAIL_EXIT1 ("getaddrinfo (%s, %s) returned %s, expected EAI_AGAIN",
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host_name, family_names[i], gai_strerror (res));
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}
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}
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/* Simulate DNS server dropping all queries. */
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static void
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test_drop (void)
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{
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struct resolv_test *aux = resolv_test_start
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((struct resolv_redirect_config)
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{
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.response_callback = response_drop,
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});
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/* Reduce default timeout to make the test run faster. */
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_res.retrans = 1;
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_res.retry = 1;
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query_host ("site.example");
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resolv_test_end (aux);
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}
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/* Simulate DNS server sending zero-length responses. */
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static void
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test_zero_len_packet (void)
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{
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struct resolv_test *aux = resolv_test_start
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((struct resolv_redirect_config)
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{
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.response_callback = response_zero_len,
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});
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query_host ("site.example");
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resolv_test_end (aux);
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}
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static int
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do_test (void)
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{
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test_drop ();
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test_zero_len_packet ();
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if (!response_called_drop)
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FAIL_EXIT1 ("response_drop callback was not called");
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if (!response_called_zero_len)
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FAIL_EXIT1 ("response_zero_len callback was not called");
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return 0;
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}
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#include <support/test-driver.c>
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