Windows UWP (Store) support fix (#845)

Because AppVeyor's version of MSVC needed to be patched to build UWP
applications:
https://developercommunity.visualstudio.com/t/clexe-compiler-error-C1007-when-compili/10486219
We ended up disabling UWP builds in our CI environment.

It turns out UWP support had broken in the meantime:
https://github.com/microsoft/vcpkg/pull/40213

This PR fixes the build regression and also adds a GitHub action CI
workflow for building the UWP app so we can catch this in the future.

Fix By: Brad House (@bradh352)

.github/workflows/uwp.yml

@@ -0,0 +1,29 @@
+# Copyright (C) The c-ares project and its contributors
+# SPDX-License-Identifier: MIT
+name: Windows UWP (Store)
+on:
+  push:
+  pull_request:
+
+concurrency:
+  group: ${{ github.ref }}-uwp
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: windows-latest
+    name: Windows UWP (Store)
+    steps:
+      - uses: ilammy/msvc-dev-cmd@v1
+        with:
+          arch: x64
+          uwp: true
+      - name: Checkout c-ares
+        uses: actions/checkout@v4
+      - name: Build c-ares
+        run: |
+          mkdir build
+          cmake -DCARES_STATIC=ON -DCARES_STATIC_PIC=ON "-DCMAKE_SYSTEM_VERSION=10.0" -DCMAKE_SYSTEM_NAME=WindowsStore -A x64 -Bbuild
+          cmake --build build --config Debug
+
+# -DCMAKE_SYSTEM_VERSION=10.0

CMakeLists.txt

@@ -425,6 +425,10 @@ CHECK_SYMBOL_EXISTS (if_indextoname  "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_IF_INDE
 CHECK_SYMBOL_EXISTS (if_nametoindex  "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_IF_NAMETOINDEX)
 CHECK_SYMBOL_EXISTS (ConvertInterfaceIndexToLuid  "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_CONVERTINTERFACEINDEXTOLUID)
 CHECK_SYMBOL_EXISTS (ConvertInterfaceLuidToNameA  "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_CONVERTINTERFACELUIDTONAMEA)
+CHECK_SYMBOL_EXISTS (NotifyIpInterfaceChange      "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_NOTIFYIPINTERFACECHANGE)
+CHECK_SYMBOL_EXISTS (RegisterWaitForSingleObject  "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_REGISTERWAITFORSINGLEOBJECT)
+
+
 CHECK_SYMBOL_EXISTS (inet_net_pton   "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_INET_NET_PTON)
 IF (NOT WIN32)
 	# Disabled on Windows, because these functions are only really supported on Windows

configure.ac

@@ -585,6 +585,8 @@ AC_CHECK_DECL(kqueue,          [AC_DEFINE([HAVE_KQUEUE],            1, [Define t
 AC_CHECK_DECL(epoll_create1,   [AC_DEFINE([HAVE_EPOLL],             1, [Define to 1 if you have `epoll_{create1,ctl,wait}`])], [], $cares_all_includes)
 AC_CHECK_DECL(ConvertInterfaceIndexToLuid, [AC_DEFINE([HAVE_CONVERTINTERFACEINDEXTOLUID], 1, [Define to 1 if you have `ConvertInterfaceIndexToLuid`])], [], $cares_all_includes)
 AC_CHECK_DECL(ConvertInterfaceLuidToNameA, [AC_DEFINE([HAVE_CONVERTINTERFACELUIDTONAMEA], 1, [Define to 1 if you have `ConvertInterfaceLuidToNameA`])], [], $cares_all_includes)
+AC_CHECK_DECL(NotifyIpInterfaceChange,     [AC_DEFINE([HAVE_NOTIFYIPINTERFACECHANGE],     1, [Define to 1 if you have `NotifyIpInterfaceChange`]    )], [], $cares_all_includes)
+AC_CHECK_DECL(RegisterWaitForSingleObject, [AC_DEFINE([HAVE_REGISTERWAITFORSINGLEOBJECT], 1, [Define to 1 if you have `RegisterWaitForSingleObject`])], [], $cares_all_includes)
 AC_CHECK_DECL(__system_property_get,       [AC_DEFINE([HAVE___SYSTEM_PROPERTY_GET],       1, [Define to 1 if you have `__system_property_get`]      )], [], $cares_all_includes)
 
 

src/lib/ares_config.h.cmake

@@ -148,6 +148,12 @@
 /* Define to 1 if you have the `ConvertInterfaceLuidToNameA' function. */
 #cmakedefine HAVE_CONVERTINTERFACELUIDTONAMEA 1
 
+/* Define to 1 if you have the `NotifyIpInterfaceChange' function. */
+#cmakedefine HAVE_NOTIFYIPINTERFACECHANGE 1
+
+/* Define to 1 if you have the `RegisterWaitForSingleObject' function. */
+#cmakedefine HAVE_REGISTERWAITFORSINGLEOBJECT 1
+
 /* Define to 1 if you have a IPv6 capable working inet_net_pton function. */
 #cmakedefine HAVE_INET_NET_PTON 1
 

src/lib/config-win32.h

@@ -352,6 +352,9 @@
 #  define HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID 1
 #endif
 
+/* Define to 1 if you have the `RegisterWaitForSingleObject' function. */
+#define HAVE_REGISTERWAITFORSINGLEOBJECT 1
+
 #if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) && \
   !defined(__WATCOMC__) && !defined(WATT32)
 /* Define if you have if_nametoindex() */
@@ -362,6 +365,8 @@
 #  define HAVE_CONVERTINTERFACEINDEXTOLUID 1
 /* Define to 1 if you have the `ConvertInterfaceLuidToNameA' function. */
 #  define HAVE_CONVERTINTERFACELUIDTONAMEA 1
+/* Define to 1 if you have the `NotifyIpInterfaceChange' function. */
+#  define HAVE_NOTIFYIPINTERFACECHANGE 1
 #endif
 
 /* ---------------------------------------------------------------- */

src/lib/event/ares_event_configchg.c

@@ -195,13 +195,14 @@ void ares_event_configchg_destroy(ares_event_configchg_t *configchg)
     return;
   }
 
-#  ifndef __WATCOMC__
+#  ifdef HAVE_NOTIFYIPINTERFACECHANGE
   if (configchg->ifchg_hnd != NULL) {
     CancelMibChangeNotify2(configchg->ifchg_hnd);
     configchg->ifchg_hnd = NULL;
   }
 #  endif
 
+#  ifdef HAVE_REGISTERWAITFORSINGLEOBJECT
   if (configchg->regip4_wait != NULL) {
     UnregisterWait(configchg->regip4_wait);
     configchg->regip4_wait = NULL;
@@ -231,12 +232,13 @@ void ares_event_configchg_destroy(ares_event_configchg_t *configchg)
     CloseHandle(configchg->regip6_event);
     configchg->regip6_event = NULL;
   }
+#  endif
 
   ares_free(configchg);
 }
 
 
-#  ifndef __WATCOMC__
+#  ifdef HAVE_NOTIFYIPINTERFACECHANGE
 static void NETIOAPI_API_
   ares_event_configchg_ip_cb(PVOID CallerContext, PMIB_IPINTERFACE_ROW Row,
                              MIB_NOTIFICATION_TYPE NotificationType)
@@ -251,6 +253,7 @@ static void NETIOAPI_API_
 static ares_bool_t
   ares_event_configchg_regnotify(ares_event_configchg_t *configchg)
 {
+#  ifdef HAVE_REGISTERWAITFORSINGLEOBJECT
 #    if defined(__WATCOMC__) && !defined(REG_NOTIFY_THREAD_AGNOSTIC)
 #      define REG_NOTIFY_THREAD_AGNOSTIC 0x10000000L
 #    endif
@@ -266,7 +269,9 @@ static ares_bool_t
                               configchg->regip6_event, TRUE) != ERROR_SUCCESS) {
     return ARES_FALSE;
   }
-
+#  else
+  (void)configchg;
+#  endif
   return ARES_TRUE;
 }
 
@@ -296,7 +301,7 @@ ares_status_t ares_event_configchg_init(ares_event_configchg_t **configchg,
 
   c->e = e;
 
-#  ifndef __WATCOMC__
+#  ifdef HAVE_NOTIFYIPINTERFACECHANGE
   /* NOTE: If a user goes into the control panel and changes the network
    *       adapter DNS addresses manually, this will NOT trigger a notification.
    *       We've also tried listening on NotifyUnicastIpAddressChange(), but
@@ -309,6 +314,7 @@ ares_status_t ares_event_configchg_init(ares_event_configchg_t **configchg,
   }
 #  endif
 
+#  ifdef HAVE_REGISTERWAITFORSINGLEOBJECT
   /* Monitor HKLM\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\Interfaces
    * and HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
    * for changes via RegNotifyChangeKeyValue() */
@@ -353,6 +359,7 @@ ares_status_t ares_event_configchg_init(ares_event_configchg_t **configchg,
     status = ARES_ESERVFAIL;
     goto done;
   }
+#  endif
 
   if (!ares_event_configchg_regnotify(c)) {
     status = ARES_ESERVFAIL;