tests: add test for bug #1303 (dns cache timeout)

Test-case 1515 reproduces bug #1303, where libcurl
would incorrectly prune DNS entries added via
CURLOPT_RESOLVE after the DNS_CACHE_TIMEOUT had
expired.

tests/data/Makefile.am

@@ -123,7 +123,7 @@ test1408 test1409 test1410          test1412 test1413 test1414 test1415 \
 test1416 test1417 \
 \
 test1500 test1501 test1502 test1503 test1504 test1505 test1506 test1507 \
-test1508 test1509 test1510 test1511 test1512 test1513 test1514 \
+test1508 test1509 test1510 test1511 test1512 test1513 test1514 test1515 \
 \
 test1900 test1901 test1902 test1903 \
 \

tests/data/test1515

@@ -0,0 +1,58 @@
+<testcase>
+
+<info>
+<keywords>
+HTTP
+multi
+FAILURE
+resolve
+</keywords>
+</info>
+
+<reply>
+# Close the connection after the first request. Second request will happen after
+# the DNS cache timeout elapses and must succeed exactly like the first one.
+<data1>
+HTTP/1.1 200 OK
+Date: Thu, 03 Feb 2014 17:04:00 GMT
+Server: test-server/fake swsclose
+Connection: close
+Content-Type: text/html
+Content-Length: 6
+
+hello
+</data1>
+<data2>
+HTTP/1.1 200 OK
+Date: Thu, 03 Feb 2014 17:04:02 GMT
+Server: test-server/fake swsclose
+Connection: close
+Content-Type: text/html
+Content-Length: 6
+
+hello
+</data2>
+</reply>
+
+<client>
+<server>
+http
+</server>
+<tool>
+lib1515
+</tool>
+<name>
+caching of manual libcurl DNS entries after DNS cache timeout
+</name>
+<command>
+/path/1515 %HOSTIP %HTTPPORT
+</command>
+</client>
+
+<verify>
+<errorcode>
+0
+</errorcode>
+</verify>
+
+</testcase>

tests/libtest/Makefile.inc

@@ -21,7 +21,7 @@ noinst_PROGRAMS = chkhostname libauthretry libntlmconnect                \
  lib571 lib572 lib573 lib574 lib575 lib576        lib578 lib579 lib582   \
  lib583 lib585 lib586 lib587        lib590 lib591 lib597 lib598 lib599   \
  lib1500 lib1501 lib1502 lib1503 lib1504 lib1505 lib1506 lib1507 lib1508 \
- lib1509 lib1510 lib1511 lib1512 lib1513 lib1514 \
+ lib1509 lib1510 lib1511 lib1512 lib1513 lib1514 lib1515 \
  lib1900 \
  lib2033
 
@@ -351,6 +351,10 @@ lib1514_SOURCES = lib1514.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib1514_LDADD = $(TESTUTIL_LIBS)
 lib1514_CPPFLAGS = $(AM_CPPFLAGS) -DLIB1514
 
+lib1515_SOURCES = lib1515.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
+lib1515_LDADD = $(TESTUTIL_LIBS)
+lib1515_CPPFLAGS = $(AM_CPPFLAGS)
+
 lib1900_SOURCES = lib1900.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib1900_LDADD = $(TESTUTIL_LIBS)
 lib1900_CPPFLAGS = $(AM_CPPFLAGS)

tests/libtest/lib1515.c

@@ -0,0 +1,141 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+ 
+/*
+ * Check for bugs #1303 and #1327: libcurl should never remove DNS entries
+ * created via CURLOPT_RESOLVE, neither after DNS_CACHE_TIMEOUT elapses
+ * (test1515) nor a dead connection is detected (test1616).
+ */
+ 
+#include "test.h"
+#include "testutil.h"
+#include "warnless.h"
+#include "memdebug.h"
+
+#define TEST_HANG_TIMEOUT 60 * 1000
+
+#define DNS_TIMEOUT 1
+
+int debug_callback(CURL *curl, curl_infotype info, char *msg, size_t len, void *ptr)
+{
+  if (info == CURLINFO_TEXT)
+    fprintf(stderr, "debug: %.*s", (int) len, msg);
+
+  return 0;
+}
+
+int do_one_request(CURLM *m, char *URL, char *resolve)
+{
+  CURL *curls;
+  struct curl_slist *resolve_list = NULL;
+  int still_running;
+  int res = 0;
+  CURLMsg *msg;
+  int msgs_left;
+  
+  resolve_list = curl_slist_append(resolve_list, resolve);
+  
+  easy_init(curls);
+  
+  easy_setopt(curls, CURLOPT_URL, URL);
+  easy_setopt(curls, CURLOPT_RESOLVE, resolve_list);
+  easy_setopt(curls, CURLOPT_DEBUGFUNCTION, debug_callback);
+  easy_setopt(curls, CURLOPT_VERBOSE, 1);
+  easy_setopt(curls, CURLOPT_DNS_CACHE_TIMEOUT, DNS_TIMEOUT);
+  
+  multi_add_handle(m, curls);
+  multi_perform(m, &still_running);
+  
+  abort_on_test_timeout();
+
+  while (still_running)
+  {
+    struct timeval timeout;
+    fd_set fdread, fdwrite, fdexcep;
+    int maxfd = -99;
+
+    FD_ZERO(&fdread);
+    FD_ZERO(&fdwrite);
+    FD_ZERO(&fdexcep);
+    timeout.tv_sec = 1;
+    timeout.tv_usec = 0;
+
+    multi_fdset(m, &fdread, &fdwrite, &fdexcep, &maxfd);
+    select_test(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+
+    abort_on_test_timeout();
+    multi_perform(m, &still_running);
+
+    abort_on_test_timeout();
+  }
+
+  while ((msg = curl_multi_info_read(m, &msgs_left)))
+  {
+    if (msg->msg == CURLMSG_DONE && msg->easy_handle == curls)
+    {
+      res = msg->data.result;
+      break;
+    }
+  }
+  
+test_cleanup:
+  curl_multi_remove_handle(m, curls);
+  curl_easy_cleanup(curls);
+  curl_slist_free_all(resolve_list);
+  
+  return res;
+}
+
+int test(char *URL)
+{
+  CURLM* multi = NULL;
+  int res = 0;
+  char *address = libtest_arg2;
+  char *port = libtest_arg3;
+  char *path = URL;
+  char dns_entry[256];
+  int i;
+  int count = 2;
+
+  snprintf(dns_entry, sizeof(dns_entry), "testserver.example.com:%s:%s", port, address);
+  char target_url[256];
+  
+  start_test_timing();
+  
+  global_init(CURL_GLOBAL_ALL);
+  multi_init(multi);
+  
+  for (i = 1; i <= count; i++)
+  {
+    snprintf(target_url, sizeof(target_url), "http://testserver.example.com:%s%s%04d", port, path, i);
+    /* second request must succeed like the first one */
+    if ((res = do_one_request(multi, target_url, dns_entry)))
+      goto test_cleanup;
+    if (i < count)
+      sleep(DNS_TIMEOUT + 1);
+  }
+
+test_cleanup:
+  curl_multi_cleanup(multi);
+
+  return (int) res;
+}