lib1592.c 4.6 KB

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  1. /***************************************************************************
  2. * _ _ ____ _
  3. * Project ___| | | | _ \| |
  4. * / __| | | | |_) | |
  5. * | (__| |_| | _ <| |___
  6. * \___|\___/|_| \_\_____|
  7. *
  8. * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
  9. *
  10. * This software is licensed as described in the file COPYING, which
  11. * you should have received as part of this distribution. The terms
  12. * are also available at https://curl.se/docs/copyright.html.
  13. *
  14. * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15. * copies of the Software, and permit persons to whom the Software is
  16. * furnished to do so, under the terms of the COPYING file.
  17. *
  18. * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19. * KIND, either express or implied.
  20. *
  21. * SPDX-License-Identifier: curl
  22. *
  23. ***************************************************************************/
  24. /*
  25. * See https://github.com/curl/curl/issues/3371
  26. *
  27. * This test case checks whether curl_multi_remove_handle() cancels
  28. * asynchronous DNS resolvers without blocking where possible. Obviously, it
  29. * only tests whichever resolver cURL is actually built with.
  30. */
  31. /* We're willing to wait a very generous two seconds for the removal. This is
  32. as low as we can go while still easily supporting SIGALRM timing for the
  33. non-threaded blocking resolver. It doesn't matter that much because when
  34. the test passes, we never wait this long. We set it much higher to avoid
  35. issues when running on overloaded CI machines. */
  36. #define TEST_HANG_TIMEOUT 60 * 1000
  37. #include "test.h"
  38. #include "testutil.h"
  39. #include <sys/stat.h>
  40. CURLcode test(char *URL)
  41. {
  42. int stillRunning;
  43. CURLM *multiHandle = NULL;
  44. CURL *curl = NULL;
  45. CURLcode res = CURLE_OK;
  46. CURLMcode mres;
  47. int timeout;
  48. global_init(CURL_GLOBAL_ALL);
  49. multi_init(multiHandle);
  50. easy_init(curl);
  51. easy_setopt(curl, CURLOPT_VERBOSE, 1L);
  52. easy_setopt(curl, CURLOPT_URL, URL);
  53. /* Set a DNS server that hopefully will not respond when using c-ares. */
  54. if(curl_easy_setopt(curl, CURLOPT_DNS_SERVERS, "0.0.0.0") == CURLE_OK)
  55. /* Since we could set the DNS server, presume we are working with a
  56. resolver that can be cancelled (i.e. c-ares). Thus,
  57. curl_multi_remove_handle() should not block even when the resolver
  58. request is outstanding. So, set a request timeout _longer_ than the
  59. test hang timeout so we will fail if the handle removal call incorrectly
  60. blocks. */
  61. timeout = TEST_HANG_TIMEOUT * 2;
  62. else {
  63. /* If we can't set the DNS server, presume that we are configured to use a
  64. resolver that can't be cancelled (i.e. the threaded resolver or the
  65. non-threaded blocking resolver). So, we just test that the
  66. curl_multi_remove_handle() call does finish well within our test
  67. timeout.
  68. But, it is very unlikely that the resolver request will take any time at
  69. all because we haven't been able to configure the resolver to use an
  70. non-responsive DNS server. At least we exercise the flow.
  71. */
  72. fprintf(stderr,
  73. "CURLOPT_DNS_SERVERS not supported; "
  74. "assuming curl_multi_remove_handle() will block\n");
  75. timeout = TEST_HANG_TIMEOUT / 2;
  76. }
  77. /* Setting a timeout on the request should ensure that even if we have to
  78. wait for the resolver during curl_multi_remove_handle(), it won't take
  79. longer than this, because the resolver request inherits its timeout from
  80. this. */
  81. easy_setopt(curl, CURLOPT_TIMEOUT_MS, timeout);
  82. multi_add_handle(multiHandle, curl);
  83. /* This should move the handle from INIT => CONNECT => WAITRESOLVE. */
  84. fprintf(stderr, "curl_multi_perform()...\n");
  85. multi_perform(multiHandle, &stillRunning);
  86. fprintf(stderr, "curl_multi_perform() succeeded\n");
  87. /* Start measuring how long it takes to remove the handle. */
  88. fprintf(stderr, "curl_multi_remove_handle()...\n");
  89. start_test_timing();
  90. mres = curl_multi_remove_handle(multiHandle, curl);
  91. if(mres) {
  92. fprintf(stderr, "curl_multi_remove_handle() failed, with code %d\n", mres);
  93. res = TEST_ERR_MULTI;
  94. goto test_cleanup;
  95. }
  96. fprintf(stderr, "curl_multi_remove_handle() succeeded\n");
  97. /* Fail the test if it took too long to remove. This happens after the fact,
  98. and says "it seems that it would have run forever", which isn't true, but
  99. it's close enough, and simple to do. */
  100. abort_on_test_timeout();
  101. test_cleanup:
  102. curl_easy_cleanup(curl);
  103. curl_multi_cleanup(multiHandle);
  104. curl_global_cleanup();
  105. return res;
  106. }