124 lines
4.5 KiB
C
124 lines
4.5 KiB
C
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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/*
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* See https://github.com/curl/curl/issues/3371
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*
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* This test case checks whether curl_multi_remove_handle() cancels
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* asynchronous DNS resolvers without blocking where possible. Obviously, it
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* only tests whichever resolver cURL is actually built with.
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*/
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/* We're willing to wait a very generous two seconds for the removal. This is
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as low as we can go while still easily supporting SIGALRM timing for the
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non-threaded blocking resolver. It doesn't matter that much because when
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the test passes, we never wait this long. */
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#define TEST_HANG_TIMEOUT 2 * 1000
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#include "test.h"
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#include "testutil.h"
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#include <sys/stat.h>
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int test(char *URL)
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{
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int stillRunning;
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CURLM *multiHandle = NULL;
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CURL *curl = NULL;
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CURLcode res = CURLE_OK;
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CURLMcode mres;
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int timeout;
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global_init(CURL_GLOBAL_ALL);
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multi_init(multiHandle);
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easy_init(curl);
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easy_setopt(curl, CURLOPT_VERBOSE, 1L);
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easy_setopt(curl, CURLOPT_URL, URL);
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/* Set a DNS server that hopefully will not respond when using c-ares. */
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if(curl_easy_setopt(curl, CURLOPT_DNS_SERVERS, "0.0.0.0") == CURLE_OK)
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/* Since we could set the DNS server, presume we are working with a
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resolver that can be cancelled (i.e. c-ares). Thus,
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curl_multi_remove_handle() should not block even when the resolver
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request is outstanding. So, set a request timeout _longer_ than the
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test hang timeout so we will fail if the handle removal call incorrectly
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blocks. */
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timeout = TEST_HANG_TIMEOUT * 2;
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else {
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/* If we can't set the DNS server, presume that we are configured to use a
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resolver that can't be cancelled (i.e. the threaded resolver or the
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non-threaded blocking resolver). So, we just test that the
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curl_multi_remove_handle() call does finish well within our test
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timeout.
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But, it is very unlikely that the resolver request will take any time at
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all because we haven't been able to configure the resolver to use an
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non-responsive DNS server. At least we exercise the flow.
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*/
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fprintf(stderr,
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"CURLOPT_DNS_SERVERS not supported; "
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"assuming curl_multi_remove_handle() will block\n");
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timeout = TEST_HANG_TIMEOUT / 2;
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}
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/* Setting a timeout on the request should ensure that even if we have to
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wait for the resolver during curl_multi_remove_handle(), it won't take
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longer than this, because the resolver request inherits its timeout from
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this. */
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easy_setopt(curl, CURLOPT_TIMEOUT_MS, timeout);
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multi_add_handle(multiHandle, curl);
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/* This should move the handle from INIT => CONNECT => WAITRESOLVE. */
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fprintf(stderr, "curl_multi_perform()...\n");
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multi_perform(multiHandle, &stillRunning);
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fprintf(stderr, "curl_multi_perform() succeeded\n");
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/* Start measuring how long it takes to remove the handle. */
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fprintf(stderr, "curl_multi_remove_handle()...\n");
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start_test_timing();
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mres = curl_multi_remove_handle(multiHandle, curl);
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if(mres) {
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fprintf(stderr, "curl_multi_remove_handle() failed, "
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"with code %d\n", (int)res);
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res = TEST_ERR_MULTI;
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goto test_cleanup;
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}
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fprintf(stderr, "curl_multi_remove_handle() succeeded\n");
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/* Fail the test if it took too long to remove. This happens after the fact,
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and says "it seems that it would have run forever", which isn't true, but
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it's close enough, and simple to do. */
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abort_on_test_timeout();
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test_cleanup:
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curl_easy_cleanup(curl);
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curl_multi_cleanup(multiHandle);
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curl_global_cleanup();
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return (int)res;
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}
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