[libmicrohttpd] branch master updated: Added new test for concurrent digest authorisation

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karlson2k pushed a commit to branch master
in repository libmicrohttpd.

The following commit(s) were added to refs/heads/master by this push:
     new a9adbf77 Added new test for concurrent digest authorisation
a9adbf77 is described below

commit a9adbf77b996fb7fda34b25f513f81d23544f27c
Author: Evgeny Grin (Karlson2k) <k2k@narod.ru>
AuthorDate: Sun Jan 30 20:01:40 2022 +0300

    Added new test for concurrent digest authorisation
    
    Testcase for the situation reported in mailing list:
    https://lists.gnu.org/archive/html/libmicrohttpd/2022-01/msg00000.html
---
 src/testcurl/Makefile.am                  |  10 +-
 src/testcurl/test_digestauth_concurrent.c | 634 ++++++++++++++++++++++++++++++
 2 files changed, 643 insertions(+), 1 deletion(-)

diff --git a/src/testcurl/Makefile.am b/src/testcurl/Makefile.am
index da209679..cc67b87a 100644
--- a/src/testcurl/Makefile.am
+++ b/src/testcurl/Makefile.am
@@ -75,7 +75,8 @@ if ENABLE_DAUTH
 THREAD_ONLY_TESTS += \
   test_digestauth \
   test_digestauth_sha256 \
-  test_digestauth_with_arguments
+  test_digestauth_with_arguments \
+  test_digestauth_concurrent
 endif
 
 if HEAVY_TESTS
@@ -237,6 +238,13 @@ test_digestauth_with_arguments_SOURCES = \
 test_digestauth_with_arguments_LDADD = \
   @LIBGCRYPT_LIBS@ $(LDADD)
 
+test_digestauth_concurrent_SOURCES = \
+  test_digestauth_concurrent.c
+test_digestauth_concurrent_CFLAGS = \
+  $(PTHREAD_CFLAGS) $(AM_CFLAGS)
+test_digestauth_concurrent_LDADD = \
+  @LIBGCRYPT_LIBS@ $(LDADD) $(PTHREAD_LIBS) $(LDADD)
+
 test_get_iovec_SOURCES = \
   test_get_iovec.c mhd_has_in_name.h
 
diff --git a/src/testcurl/test_digestauth_concurrent.c 
b/src/testcurl/test_digestauth_concurrent.c
new file mode 100644
index 00000000..f7d533dc
--- /dev/null
+++ b/src/testcurl/test_digestauth_concurrent.c
@@ -0,0 +1,634 @@
+/*
+     This file is part of libmicrohttpd
+     Copyright (C) 2010 Christian Grothoff
+     Copyright (C) 2016-2022 Evgeny Grin (Karlson2k)
+
+     libmicrohttpd is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 2, or (at your
+     option) any later version.
+
+     libmicrohttpd 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
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with libmicrohttpd; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
+*/
+
+/**
+ * @file test_digestauth_concurrent.c
+ * @brief  Testcase for libmicrohttpd concurrent Digest Authorisation
+ * @author Amr Ali
+ * @author Karlson2k (Evgeny Grin)
+ */
+
+#include "MHD_config.h"
+#include "platform.h"
+#include <curl/curl.h>
+#include <microhttpd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#ifdef MHD_HTTPS_REQUIRE_GRYPT
+#ifdef HAVE_GCRYPT_H
+#include <gcrypt.h>
+#endif
+#endif /* MHD_HTTPS_REQUIRE_GRYPT */
+
+#ifndef WINDOWS
+#include <sys/socket.h>
+#include <unistd.h>
+#else
+#include <wincrypt.h>
+#endif
+
+#include <pthread.h>
+
+#include "mhd_has_param.h"
+
+#ifndef CURL_VERSION_BITS
+#define CURL_VERSION_BITS(x,y,z) ((x)<<16|(y)<<8|(z))
+#endif /* ! CURL_VERSION_BITS */
+#ifndef CURL_AT_LEAST_VERSION
+#define CURL_AT_LEAST_VERSION(x,y,z) \
+  (LIBCURL_VERSION_NUM >= CURL_VERSION_BITS(x, y, z))
+#endif /* ! CURL_AT_LEAST_VERSION */
+
+#ifndef _MHD_INSTRMACRO
+/* Quoted macro parameter */
+#define _MHD_INSTRMACRO(a) #a
+#endif /* ! _MHD_INSTRMACRO */
+#ifndef _MHD_STRMACRO
+/* Quoted expanded macro parameter */
+#define _MHD_STRMACRO(a) _MHD_INSTRMACRO (a)
+#endif /* ! _MHD_STRMACRO */
+
+#if defined(HAVE___FUNC__)
+#define externalErrorExit(ignore) \
+    _externalErrorExit_func(NULL, __func__, __LINE__)
+#define externalErrorExitDesc(errDesc) \
+    _externalErrorExit_func(errDesc, __func__, __LINE__)
+#define libcurlErrorExit(ignore) \
+    _libcurlErrorExit_func(NULL, __func__, __LINE__)
+#define libcurlErrorExitDesc(errDesc) \
+    _libcurlErrorExit_func(errDesc, __func__, __LINE__)
+#define mhdErrorExit(ignore) \
+    _mhdErrorExit_func(NULL, __func__, __LINE__)
+#define mhdErrorExitDesc(errDesc) \
+    _mhdErrorExit_func(errDesc, __func__, __LINE__)
+#define checkCURLE_OK(libcurlcall) \
+    _checkCURLE_OK_func((libcurlcall), _MHD_STRMACRO(libcurlcall), \
+                        __func__, __LINE__)
+#elif defined(HAVE___FUNCTION__)
+#define externalErrorExit(ignore) \
+    _externalErrorExit_func(NULL, __FUNCTION__, __LINE__)
+#define externalErrorExitDesc(errDesc) \
+    _externalErrorExit_func(errDesc, __FUNCTION__, __LINE__)
+#define libcurlErrorExit(ignore) \
+    _libcurlErrorExit_func(NULL, __FUNCTION__, __LINE__)
+#define libcurlErrorExitDesc(errDesc) \
+    _libcurlErrorExit_func(errDesc, __FUNCTION__, __LINE__)
+#define mhdErrorExit(ignore) \
+    _mhdErrorExit_func(NULL, __FUNCTION__, __LINE__)
+#define mhdErrorExitDesc(errDesc) \
+    _mhdErrorExit_func(errDesc, __FUNCTION__, __LINE__)
+#define checkCURLE_OK(libcurlcall) \
+    _checkCURLE_OK_func((libcurlcall), _MHD_STRMACRO(libcurlcall), \
+                        __FUNCTION__, __LINE__)
+#else
+#define externalErrorExit(ignore) _externalErrorExit_func(NULL, NULL, __LINE__)
+#define externalErrorExitDesc(errDesc) \
+  _externalErrorExit_func(errDesc, NULL, __LINE__)
+#define libcurlErrorExit(ignore) _libcurlErrorExit_func(NULL, NULL, __LINE__)
+#define libcurlErrorExitDesc(errDesc) \
+  _libcurlErrorExit_func(errDesc, NULL, __LINE__)
+#define mhdErrorExit(ignore) _mhdErrorExit_func(NULL, NULL, __LINE__)
+#define mhdErrorExitDesc(errDesc) _mhdErrorExit_func(errDesc, NULL, __LINE__)
+#define checkCURLE_OK(libcurlcall) \
+  _checkCURLE_OK_func((libcurlcall), _MHD_STRMACRO(libcurlcall), NULL, 
__LINE__)
+#endif
+
+
+_MHD_NORETURN static void
+_externalErrorExit_func (const char *errDesc, const char *funcName, int 
lineNum)
+{
+  fflush (stdout);
+  if ((NULL != errDesc) && (0 != errDesc[0]))
+    fprintf (stderr, "%s", errDesc);
+  else
+    fprintf (stderr, "System or external library call failed");
+  if ((NULL != funcName) && (0 != funcName[0]))
+    fprintf (stderr, " in %s", funcName);
+  if (0 < lineNum)
+    fprintf (stderr, " at line %d", lineNum);
+
+  fprintf (stderr, ".\nLast errno value: %d (%s)\n", (int) errno,
+           strerror (errno));
+#ifdef MHD_WINSOCK_SOCKETS
+  fprintf (stderr, "WSAGetLastError() value: %d\n", (int) WSAGetLastError ());
+#endif /* MHD_WINSOCK_SOCKETS */
+  fflush (stderr);
+  exit (99);
+}
+
+
+static char libcurl_errbuf[CURL_ERROR_SIZE] = "";
+
+_MHD_NORETURN static void
+_libcurlErrorExit_func (const char *errDesc, const char *funcName, int lineNum)
+{
+  fflush (stdout);
+  if ((NULL != errDesc) && (0 != errDesc[0]))
+    fprintf (stderr, "%s", errDesc);
+  else
+    fprintf (stderr, "CURL library call failed");
+  if ((NULL != funcName) && (0 != funcName[0]))
+    fprintf (stderr, " in %s", funcName);
+  if (0 < lineNum)
+    fprintf (stderr, " at line %d", lineNum);
+
+  fprintf (stderr, ".\nLast errno value: %d (%s)\n", (int) errno,
+           strerror (errno));
+#ifdef MHD_WINSOCK_SOCKETS
+  fprintf (stderr, "WSAGetLastError() value: %d\n", (int) WSAGetLastError ());
+#endif /* MHD_WINSOCK_SOCKETS */
+  if (0 != libcurl_errbuf[0])
+    fprintf (stderr, "Last libcurl error description: %s\n", libcurl_errbuf);
+
+  fflush (stderr);
+  exit (99);
+}
+
+
+_MHD_NORETURN static void
+_mhdErrorExit_func (const char *errDesc, const char *funcName, int lineNum)
+{
+  fflush (stdout);
+  if ((NULL != errDesc) && (0 != errDesc[0]))
+    fprintf (stderr, "%s", errDesc);
+  else
+    fprintf (stderr, "MHD unexpected error");
+  if ((NULL != funcName) && (0 != funcName[0]))
+    fprintf (stderr, " in %s", funcName);
+  if (0 < lineNum)
+    fprintf (stderr, " at line %d", lineNum);
+
+  fprintf (stderr, ".\nLast errno value: %d (%s)\n", (int) errno,
+           strerror (errno));
+#ifdef MHD_WINSOCK_SOCKETS
+  fprintf (stderr, "WSAGetLastError() value: %d\n", (int) WSAGetLastError ());
+#endif /* MHD_WINSOCK_SOCKETS */
+
+  fflush (stderr);
+  exit (8);
+}
+
+
+static void
+_checkCURLE_OK_func (CURLcode code, const char *curlFunc,
+                     const char *funcName, int lineNum)
+{
+  if (CURLE_OK == code)
+    return;
+
+  fflush (stdout);
+  if ((NULL != curlFunc) && (0 != curlFunc[0]))
+    fprintf (stderr, "'%s' resulted in '%s'", curlFunc,
+             curl_easy_strerror (code));
+  else
+    fprintf (stderr, "libcurl function call resulted in '%s'",
+             curl_easy_strerror (code));
+  if ((NULL != funcName) && (0 != funcName[0]))
+    fprintf (stderr, " in %s", funcName);
+  if (0 < lineNum)
+    fprintf (stderr, " at line %d", lineNum);
+
+  fprintf (stderr, ".\nLast errno value: %d (%s)\n", (int) errno,
+           strerror (errno));
+  if (0 != libcurl_errbuf[0])
+    fprintf (stderr, "Last libcurl error description: %s\n", libcurl_errbuf);
+
+  fflush (stderr);
+  exit (9);
+}
+
+
+/* Could be increased to facilitate debugging */
+#define TIMEOUTS_VAL 5
+
+#define MHD_URI_BASE_PATH "/bar%20foo%3Fkey%3Dvalue"
+
+#define PAGE \
+  "<html><head><title>libmicrohttpd demo</title></head><body>Access 
granted</body></html>"
+
+#define DENIED \
+  "<html><head><title>libmicrohttpd demo</title></head><body>Access 
denied</body></html>"
+
+#define MY_OPAQUE "11733b200778ce33060f31c9af70a870ba96ddd4"
+
+struct CBC
+{
+  char *buf;
+  size_t pos;
+  size_t size;
+};
+
+static int verbose;
+
+static size_t
+copyBuffer (void *ptr,
+            size_t size,
+            size_t nmemb,
+            void *ctx)
+{
+  struct CBC *cbc = ctx;
+
+  if (cbc->pos + size * nmemb > cbc->size)
+    mhdErrorExitDesc ("Wrong too large data");       /* overflow */
+  memcpy (&cbc->buf[cbc->pos], ptr, size * nmemb);
+  cbc->pos += size * nmemb;
+  return size * nmemb;
+}
+
+
+static enum MHD_Result
+ahc_echo (void *cls,
+          struct MHD_Connection *connection,
+          const char *url,
+          const char *method,
+          const char *version,
+          const char *upload_data,
+          size_t *upload_data_size,
+          void **req_cls)
+{
+  struct MHD_Response *response;
+  char *username;
+  const char *password = "testpass";
+  const char *realm = "test@example.com";
+  enum MHD_Result ret;
+  int ret_i;
+  static int already_called_marker;
+  (void) cls; (void) url;                         /* Unused. Silent compiler 
warning. */
+  (void) method; (void) version; (void) upload_data; /* Unused. Silent 
compiler warning. */
+  (void) upload_data_size; (void) req_cls;        /* Unused. Silent compiler 
warning. */
+
+  if (&already_called_marker != *req_cls)
+  { /* Called for the first time, request not fully read yet */
+    *req_cls = &already_called_marker;
+    /* Wait for complete request */
+    return MHD_YES;
+  }
+
+  username = MHD_digest_auth_get_username (connection);
+  if ( (username == NULL) ||
+       (0 != strcmp (username, "testuser")) )
+  {
+    response = MHD_create_response_from_buffer (strlen (DENIED),
+                                                DENIED,
+                                                MHD_RESPMEM_PERSISTENT);
+    if (NULL == response)
+      mhdErrorExitDesc ("MHD_create_response_from_buffer failed");
+    ret = MHD_queue_auth_fail_response2 (connection,
+                                         realm,
+                                         MY_OPAQUE,
+                                         response,
+                                         MHD_NO,
+                                         MHD_DIGEST_ALG_MD5);
+    if (MHD_YES != ret)
+      mhdErrorExitDesc ("MHD_queue_auth_fail_response2 failed");
+    MHD_destroy_response (response);
+    return ret;
+  }
+  ret_i = MHD_digest_auth_check2 (connection,
+                                  realm,
+                                  username,
+                                  password,
+                                  300,
+                                  MHD_DIGEST_ALG_MD5);
+  MHD_free (username);
+  if ( (ret_i == MHD_INVALID_NONCE) ||
+       (ret_i == MHD_NO) )
+  {
+    response = MHD_create_response_from_buffer (strlen (DENIED),
+                                                DENIED,
+                                                MHD_RESPMEM_PERSISTENT);
+    if (NULL == response)
+      mhdErrorExitDesc ("MHD_create_response_from_buffer() failed");
+    ret = MHD_queue_auth_fail_response2 (connection,
+                                         realm,
+                                         MY_OPAQUE,
+                                         response,
+                                         (MHD_INVALID_NONCE == ret_i) ?
+                                         MHD_YES : MHD_NO,
+                                         MHD_DIGEST_ALG_MD5);
+    if (MHD_YES != ret)
+      mhdErrorExitDesc ("MHD_queue_auth_fail_response2() failed");
+    MHD_destroy_response (response);
+    return ret;
+  }
+  response = MHD_create_response_from_buffer (strlen (PAGE),
+                                              PAGE,
+                                              MHD_RESPMEM_PERSISTENT);
+  if (NULL == response)
+    mhdErrorExitDesc ("MHD_create_response_from_buffer() failed");
+  ret = MHD_queue_response (connection,
+                            MHD_HTTP_OK,
+                            response);
+  if (MHD_YES != ret)
+    mhdErrorExitDesc ("MHD_queue_auth_fail_response2() failed");
+  MHD_destroy_response (response);
+  return ret;
+}
+
+
+static CURL *
+setupCURL (void *cbc, int port)
+{
+  CURL *c;
+  char url[512];
+
+  if (1)
+  {
+    int res;
+    /* A workaround for some old libcurl versions, which ignore the specified
+     * port by CURLOPT_PORT when digest authorisation is used. */
+    res = snprintf (url, (sizeof(url) / sizeof(url[0])),
+                    "http://127.0.0.1:%d%s";, port, MHD_URI_BASE_PATH);
+    if ((0 >= res) || ((sizeof(url) / sizeof(url[0])) <= (size_t) res))
+      externalErrorExitDesc ("Cannot form request URL");
+  }
+
+  c = curl_easy_init ();
+  if (NULL == c)
+    libcurlErrorExitDesc ("curl_easy_init() failed");
+
+  if ((CURLE_OK != curl_easy_setopt (c, CURLOPT_NOSIGNAL, 1L)) ||
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_ERRORBUFFER,
+                                     libcurl_errbuf)) ||
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_WRITEFUNCTION,
+                                     &copyBuffer)) ||
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_WRITEDATA, cbc)) ||
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_CONNECTTIMEOUT,
+                                     ((long) TIMEOUTS_VAL))) ||
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_TIMEOUT,
+                                     ((long) TIMEOUTS_VAL))) ||
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_HTTP_VERSION,
+                                     CURL_HTTP_VERSION_1_1)) ||
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_FAILONERROR, 1L)) ||
+#if CURL_AT_LEAST_VERSION (7, 19, 4)
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_PROTOCOLS, CURLPROTO_HTTP)) ||
+#endif /* CURL_AT_LEAST_VERSION (7, 19, 4) */
+#if CURL_AT_LEAST_VERSION (7, 45, 0)
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_DEFAULT_PROTOCOL, "http")) ||
+#endif /* CURL_AT_LEAST_VERSION (7, 45, 0) */
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_PORT, ((long) port))) ||
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_URL, url)))
+    libcurlErrorExitDesc ("curl_easy_setopt() failed");
+  if ((CURLE_OK != curl_easy_setopt (c, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST)) ||
+      (CURLE_OK != curl_easy_setopt (c, CURLOPT_USERPWD,
+                                     "testuser:testpass")))
+    libcurlErrorExitDesc ("curl_easy_setopt() authorization options failed");
+  return c;
+}
+
+
+static void
+getRnd (void *buf, size_t size)
+{
+#ifndef WINDOWS
+  int fd;
+  size_t off = 0;
+
+  fd = open ("/dev/urandom",
+             O_RDONLY);
+  if (-1 == fd)
+    externalErrorExitDesc ("Failed to open '/dev/urandom'");
+
+  do
+  {
+    ssize_t res;
+    res = read (fd, ((uint8_t *) buf) + off, size - off);
+    if (0 > res)
+      externalErrorExitDesc ("Failed to read '/dev/urandom'");
+    off += (size_t) len;
+  } while (off < size);
+  (void) close (fd);
+#else
+  HCRYPTPROV cc;
+  BOOL b;
+
+  b = CryptAcquireContext (&cc,
+                           NULL,
+                           NULL,
+                           PROV_RSA_FULL,
+                           CRYPT_VERIFYCONTEXT | CRYPT_SILENT);
+  if (b == 0)
+    externalErrorExitDesc ("CryptAcquireContext() failed");
+  b = CryptGenRandom (cc, (DWORD) size, (BYTE *) buf);
+  if (b == 0)
+    externalErrorExitDesc ("CryptGenRandom() failed");
+  CryptReleaseContext (cc, 0);
+#endif /* ! WINDOWS */
+}
+
+
+struct curlWokerInfo
+{
+  int workerNumber;
+  struct CBC cbc;
+  pthread_t pid;
+  /**
+   * The libcurl handle to run in thread
+   */
+  CURL *c;
+  /**
+   * Non-zero if worker is finished
+   */
+  volatile int finished;
+  /**
+   * Non-zero if worker result is success
+   */
+  volatile int success;
+};
+
+
+static void *
+worker_func (void *param)
+{
+  struct curlWokerInfo *const w = (struct curlWokerInfo *) param;
+  CURLcode req_result;
+  if (NULL == w)
+    externalErrorExit ();
+
+  req_result = curl_easy_perform (w->c);
+  if (CURLE_OK != req_result)
+  {
+    fprintf (stderr, "Worker %d: first request failed. ", w->workerNumber);
+    checkCURLE_OK (req_result);
+  }
+  if (w->cbc.pos != strlen (PAGE))
+  {
+    fprintf (stderr, "Worker %d: Got %u bytes ('%.*s'), expected %u bytes. ",
+             w->workerNumber,
+             (unsigned) w->cbc.pos, (int) w->cbc.pos, w->cbc.buf,
+             (unsigned) strlen (MHD_URI_BASE_PATH));
+    mhdErrorExitDesc ("Wrong returned data length");
+  }
+  if (0 != strncmp (PAGE, w->cbc.buf, strlen (PAGE)))
+  {
+    fprintf (stderr, "Worker %d: Got invalid response '%.*s'. ",
+             w->workerNumber,
+             (int) w->cbc.pos, w->cbc.buf);
+    mhdErrorExitDesc ("Wrong returned data");
+  }
+  if (verbose)
+    printf ("Worker %d: first request successful.\n", w->workerNumber);
+
+  /* Second request */
+  w->cbc.pos = 0;
+  req_result = curl_easy_perform (w->c);
+  if (CURLE_OK != req_result)
+  {
+    fprintf (stderr, "Worker %d: second request failed. ", w->workerNumber);
+    checkCURLE_OK (req_result);
+  }
+  if (w->cbc.pos != strlen (PAGE))
+  {
+    fprintf (stderr, "Worker %d: Got %u bytes ('%.*s'), expected %u bytes. ",
+             w->workerNumber,
+             (unsigned) w->cbc.pos, (int) w->cbc.pos, w->cbc.buf,
+             (unsigned) strlen (MHD_URI_BASE_PATH));
+    mhdErrorExitDesc ("Wrong returned data length");
+  }
+  if (0 != strncmp (PAGE, w->cbc.buf, strlen (PAGE)))
+  {
+    fprintf (stderr, "Worker %d: Got invalid response '%.*s'. ",
+             w->workerNumber,
+             (int) w->cbc.pos, w->cbc.buf);
+    mhdErrorExitDesc ("Wrong returned data");
+  }
+  if (verbose)
+    printf ("Worker %d: second request successful.\n", w->workerNumber);
+
+  w->success = ! 0;
+  w->finished = ! 0;
+  return NULL;
+}
+
+
+#define CLIENT_BUF_SIZE 2048
+
+static int
+testDigestAuth (void)
+{
+  struct MHD_Daemon *d;
+  char rnd[8];
+  int port;
+  size_t i;
+  /* Run three workers in parallel so at least two workers would start within
+   * the same monotonic clock second.*/
+  struct curlWokerInfo workers[3];
+  int ret;
+
+  if (MHD_NO != MHD_is_feature_supported (MHD_FEATURE_AUTODETECT_BIND_PORT))
+    port = 0;
+  else
+    port = 1165;
+
+  getRnd (rnd, sizeof(rnd));
+
+  d = MHD_start_daemon (MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG,
+                        port, NULL, NULL,
+                        &ahc_echo, PAGE,
+                        MHD_OPTION_DIGEST_AUTH_RANDOM, sizeof (rnd), rnd,
+                        MHD_OPTION_NONCE_NC_SIZE, 300,
+                        MHD_OPTION_THREAD_POOL_SIZE,
+                        (unsigned int) (sizeof(workers) / sizeof(workers[0])),
+                        MHD_OPTION_END);
+  if (d == NULL)
+    return 1;
+  if (0 == port)
+  {
+    const union MHD_DaemonInfo *dinfo;
+
+    dinfo = MHD_get_daemon_info (d,
+                                 MHD_DAEMON_INFO_BIND_PORT);
+    if ( (NULL == dinfo) ||
+         (0 == dinfo->port) )
+      mhdErrorExitDesc ("MHD_get_daemon_info() failed");
+    port = (int) dinfo->port;
+  }
+
+  /* Initialise all workers */
+  for (i = 0; i < sizeof(workers) / sizeof(workers[0]); i++)
+  {
+    struct curlWokerInfo *const w = workers + i;
+    w->workerNumber = (int) i + 1; /* Use 1-based numbering */
+    w->cbc.buf = malloc (CLIENT_BUF_SIZE);
+    if (NULL == w->cbc.buf)
+      externalErrorExitDesc ("malloc() failed");
+    w->cbc.size = CLIENT_BUF_SIZE;
+    w->cbc.pos = 0;
+    w->c = setupCURL (&w->cbc, port);
+    w->finished = 0;
+    w->success = 0;
+  }
+
+  /* Fire already initialised workers */
+  for (i = 0; i < sizeof(workers) / sizeof(workers[0]); i++)
+  {
+    struct curlWokerInfo *const w = workers + i;
+    if (0 != pthread_create (&w->pid, NULL, &worker_func, w))
+      externalErrorExitDesc ("pthread_create() failed");
+  }
+
+  /* Collect results, cleanup workers */
+  ret = 0;
+  for (i = 0; i < sizeof(workers) / sizeof(workers[0]); i++)
+  {
+    struct curlWokerInfo *const w = workers + i;
+    if (0 != pthread_join (w->pid, NULL))
+      externalErrorExitDesc ("pthread_join() failed");
+    curl_easy_cleanup (w->c);
+    free (w->cbc.buf);
+    if (! w->finished)
+      externalErrorExitDesc ("The worker thread did't signal 'finished' 
state");
+    ret += ! w->success;
+  }
+
+  MHD_stop_daemon (d);
+  return ret;
+}
+
+
+int
+main (int argc, char *const *argv)
+{
+  unsigned int errorCount = 0;
+  (void) argc; (void) argv; /* Unused. Silent compiler warning. */
+
+  verbose = ! (has_param (argc, argv, "-q") ||
+               has_param (argc, argv, "--quiet") ||
+               has_param (argc, argv, "-s") ||
+               has_param (argc, argv, "--silent"));
+
+  #ifdef MHD_HTTPS_REQUIRE_GRYPT
+#ifdef HAVE_GCRYPT_H
+  gcry_control (GCRYCTL_ENABLE_QUICK_RANDOM, 0);
+#ifdef GCRYCTL_INITIALIZATION_FINISHED
+  gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
+#endif
+#endif
+#endif /* MHD_HTTPS_REQUIRE_GRYPT */
+  if (0 != curl_global_init (CURL_GLOBAL_WIN32))
+    return 2;
+  errorCount += testDigestAuth ();
+  if (errorCount != 0)
+    fprintf (stderr, "Error (code: %u)\n", errorCount);
+  curl_global_cleanup ();
+  return (0 == errorCount) ? 0 : 1;       /* 0 == pass */
+}

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