cmake: fix support for UnixSockets feature on Win32

Move the definition of sockaddr_un struct from config-win32.h to
curl_setup.h, so that it could be shared by all build systems.

Add ADDRESS_FAMILY typedef for old mingw, now old mingw can also use
unix sockets.

Also fix the build of tests/server/sws.c on Win32 when USE_UNIX_SOCKETS
is defined.

Closes #7034

CMakeLists.txt

@@ -807,7 +807,11 @@ endif()
 option(ENABLE_UNIX_SOCKETS "Define if you want Unix domain sockets support" ON)
 if(ENABLE_UNIX_SOCKETS)
   include(CheckStructHasMember)
-  check_struct_has_member("struct sockaddr_un" sun_path "sys/un.h" USE_UNIX_SOCKETS)
+  if(WIN32)
+    set(USE_UNIX_SOCKETS ON)
+  else()
+    check_struct_has_member("struct sockaddr_un" sun_path "sys/un.h" USE_UNIX_SOCKETS)
+  endif()
 else()
   unset(USE_UNIX_SOCKETS CACHE)
 endif()

lib/config-win32.h

@@ -678,22 +678,8 @@ Vista
 #define USE_WIN32_CRYPTO
 #endif
 
-/* On MinGW the ADDRESS_FAMILY typedef was committed alongside LUP_SECURE,
-   so we use it to check for the presence of the typedef. */
-#include <ws2tcpip.h>
-#if !defined(__MINGW32__) || defined(LUP_SECURE)
 /* Define to use Unix sockets. */
 #define USE_UNIX_SOCKETS
-#if !defined(UNIX_PATH_MAX)
-  /* Replicating logic present in afunix.h of newer Windows 10 SDK versions */
-# define UNIX_PATH_MAX 108
-  /* !checksrc! disable TYPEDEFSTRUCT 1 */
-  typedef struct sockaddr_un {
-    ADDRESS_FAMILY sun_family;
-    char sun_path[UNIX_PATH_MAX];
-  } SOCKADDR_UN, *PSOCKADDR_UN;
-#endif
-#endif
 
 /* ---------------------------------------------------------------- */
 /*                       ADDITIONAL DEFINITIONS                     */

lib/curl_addrinfo.c

@@ -50,12 +50,6 @@
 #  define in_addr_t unsigned long
 #endif
 
-#if defined(USE_UNIX_SOCKETS) && defined(WINAPI_FAMILY) && \
-    (WINAPI_FAMILY == WINAPI_FAMILY_APP)
-   /* Required for sockaddr_un type */
-#  include <afunix.h>
-#endif
-
 #include <stddef.h>
 
 #include "curl_addrinfo.h"

lib/curl_setup.h

@@ -824,4 +824,20 @@ int getpwuid_r(uid_t uid, struct passwd *pwd, char *buf,
 #define ENABLE_QUIC
 #endif
 
+#if defined(USE_UNIX_SOCKETS) && defined(WIN32)
+#  if defined(__MINGW32__) && !defined(LUP_SECURE)
+     typedef u_short ADDRESS_FAMILY; /* Classic mingw, 11y+ old mingw-w64 */
+#  endif
+#  if !defined(UNIX_PATH_MAX)
+     /* Replicating logic present in afunix.h
+        (distributed with newer Windows 10 SDK versions only) */
+#    define UNIX_PATH_MAX 108
+     /* !checksrc! disable TYPEDEFSTRUCT 1 */
+     typedef struct sockaddr_un {
+       ADDRESS_FAMILY sun_family;
+       char sun_path[UNIX_PATH_MAX];
+     } SOCKADDR_UN, *PSOCKADDR_UN;
+#  endif
+#endif
+
 #endif /* HEADER_CURL_SETUP_H */

tests/server/sws.c

@@ -2072,9 +2072,9 @@ int main(int argc, char *argv[])
     strncpy(me.sau.sun_path, unix_socket, sizeof(me.sau.sun_path) - 1);
     rc = bind(sock, &me.sa, sizeof(me.sau));
     if(0 != rc && errno == EADDRINUSE) {
-      struct stat statbuf;
+      struct_stat statbuf;
       /* socket already exists. Perhaps it is stale? */
-      int unixfd = socket(AF_UNIX, SOCK_STREAM, 0);
+      curl_socket_t unixfd = socket(AF_UNIX, SOCK_STREAM, 0);
       if(CURL_SOCKET_BAD == unixfd) {
         error = SOCKERRNO;
         logmsg("Error binding socket, failed to create socket at %s: (%d) %s",
@@ -2084,15 +2084,19 @@ int main(int argc, char *argv[])
       /* check whether the server is alive */
       rc = connect(unixfd, &me.sa, sizeof(me.sau));
       error = errno;
-      close(unixfd);
+      sclose(unixfd);
       if(ECONNREFUSED != error) {
         logmsg("Error binding socket, failed to connect to %s: (%d) %s",
                unix_socket, error, strerror(error));
         goto sws_cleanup;
       }
-      /* socket server is not alive, now check if it was actually a socket.
-       * Systems which have Unix sockets will also have lstat */
+      /* socket server is not alive, now check if it was actually a socket. */
+#ifdef WIN32
+      /* Windows does not have lstat function. */
+      rc = curlx_win32_stat(unix_socket, &statbuf);
+#else
       rc = lstat(unix_socket, &statbuf);
+#endif
       if(0 != rc) {
         logmsg("Error binding socket, failed to stat %s: (%d) %s",
                unix_socket, errno, strerror(errno));