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Annotation of embedaddon/curl/tests/libtest/lib1592.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2019, 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.haxx.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:  ***************************************************************************/
        !            22: /*
        !            23:  * See https://github.com/curl/curl/issues/3371
        !            24:  *
        !            25:  * This test case checks whether curl_multi_remove_handle() cancels
        !            26:  * asynchronous DNS resolvers without blocking where possible.  Obviously, it
        !            27:  * only tests whichever resolver cURL is actually built with.
        !            28:  */
        !            29: 
        !            30: /* We're willing to wait a very generous two seconds for the removal.  This is
        !            31:    as low as we can go while still easily supporting SIGALRM timing for the
        !            32:    non-threaded blocking resolver.  It doesn't matter that much because when
        !            33:    the test passes, we never wait this long. */
        !            34: #define TEST_HANG_TIMEOUT 2 * 1000
        !            35: 
        !            36: #include "test.h"
        !            37: #include "testutil.h"
        !            38: 
        !            39: #include <sys/stat.h>
        !            40: 
        !            41: int test(char *URL)
        !            42: {
        !            43:   int stillRunning;
        !            44:   CURLM *multiHandle = NULL;
        !            45:   CURL *curl = NULL;
        !            46:   CURLMcode res = CURLM_OK;
        !            47:   int timeout;
        !            48: 
        !            49:   global_init(CURL_GLOBAL_ALL);
        !            50: 
        !            51:   multi_init(multiHandle);
        !            52: 
        !            53:   easy_init(curl);
        !            54: 
        !            55:   easy_setopt(curl, CURLOPT_VERBOSE, 1L);
        !            56:   easy_setopt(curl, CURLOPT_URL, URL);
        !            57: 
        !            58:   /* Set a DNS server that hopefully will not respond when using c-ares. */
        !            59:   if(curl_easy_setopt(curl, CURLOPT_DNS_SERVERS, "0.0.0.0") == CURLE_OK)
        !            60:     /* Since we could set the DNS server, presume we are working with a
        !            61:        resolver that can be cancelled (i.e. c-ares).  Thus,
        !            62:        curl_multi_remove_handle() should not block even when the resolver
        !            63:        request is outstanding.  So, set a request timeout _longer_ than the
        !            64:        test hang timeout so we will fail if the handle removal call incorrectly
        !            65:        blocks. */
        !            66:     timeout = TEST_HANG_TIMEOUT * 2;
        !            67:   else {
        !            68:     /* If we can't set the DNS server, presume that we are configured to use a
        !            69:        resolver that can't be cancelled (i.e. the threaded resolver or the
        !            70:        non-threaded blocking resolver).  So, we just test that the
        !            71:        curl_multi_remove_handle() call does finish well within our test
        !            72:        timeout.
        !            73: 
        !            74:        But, it is very unlikely that the resolver request will take any time at
        !            75:        all because we haven't been able to configure the resolver to use an
        !            76:        non-responsive DNS server.  At least we exercise the flow.
        !            77:        */
        !            78:     fprintf(stderr,
        !            79:             "CURLOPT_DNS_SERVERS not supported; "
        !            80:             "assuming curl_multi_remove_handle() will block\n");
        !            81:     timeout = TEST_HANG_TIMEOUT / 2;
        !            82:   }
        !            83: 
        !            84:   /* Setting a timeout on the request should ensure that even if we have to
        !            85:      wait for the resolver during curl_multi_remove_handle(), it won't take
        !            86:      longer than this, because the resolver request inherits its timeout from
        !            87:      this. */
        !            88:   easy_setopt(curl, CURLOPT_TIMEOUT_MS, timeout);
        !            89: 
        !            90:   multi_add_handle(multiHandle, curl);
        !            91: 
        !            92:   /* This should move the handle from INIT => CONNECT => WAITRESOLVE. */
        !            93:   fprintf(stderr, "curl_multi_perform()...\n");
        !            94:   multi_perform(multiHandle, &stillRunning);
        !            95:   fprintf(stderr, "curl_multi_perform() succeeded\n");
        !            96: 
        !            97:   /* Start measuring how long it takes to remove the handle. */
        !            98:   fprintf(stderr, "curl_multi_remove_handle()...\n");
        !            99:   start_test_timing();
        !           100:   res = curl_multi_remove_handle(multiHandle, curl);
        !           101:   if(res) {
        !           102:     fprintf(stderr, "curl_multi_remove_handle() failed, "
        !           103:             "with code %d\n", (int)res);
        !           104:     goto test_cleanup;
        !           105:   }
        !           106:   fprintf(stderr, "curl_multi_remove_handle() succeeded\n");
        !           107: 
        !           108:   /* Fail the test if it took too long to remove.  This happens after the fact,
        !           109:      and says "it seems that it would have run forever", which isn't true, but
        !           110:      it's close enough, and simple to do. */
        !           111:   abort_on_test_timeout();
        !           112: 
        !           113: test_cleanup:
        !           114:   curl_easy_cleanup(curl);
        !           115:   curl_multi_cleanup(multiHandle);
        !           116:   curl_global_cleanup();
        !           117: 
        !           118:   return (int)res;
        !           119: }