Merge branch 'debian/experimental-2.5'

10 files changed, 334 insertions, 1016 deletions

diff --git a/src/openvpnserv/Makefile.am b/src/openvpnserv/Makefile.am
index bc65070..5dc38c9 100644
--- a/src/openvpnserv/Makefile.am
+++ b/src/openvpnserv/Makefile.am
@@ -36,4 +36,5 @@ openvpnserv_SOURCES = \
 	service.c service.h \
 	validate.c validate.h \
 	$(top_srcdir)/src/openvpn/block_dns.c $(top_srcdir)/src/openvpn/block_dns.h \
-	openvpnserv_resources.rc
+	openvpnserv_resources.rc \
+	$(top_srcdir)/src/openvpn/ring_buffer.h
diff --git a/src/openvpnserv/Makefile.in b/src/openvpnserv/Makefile.in
deleted file mode 100644
index 90a9abe..0000000
--- a/src/openvpnserv/Makefile.in
+++ /dev/null
@@ -1,874 +0,0 @@
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-	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
-	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
-	    fi; \
-	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
-	  else \
-	    test -f "$(distdir)/$$file" \
-	    || cp -p $$d/$$file "$(distdir)/$$file" \
-	    || exit 1; \
-	  fi; \
-	done
-check-am: all-am
-check: check-am
-all-am: Makefile $(PROGRAMS)
-installdirs:
-	for dir in "$(DESTDIR)$(sbindir)"; do \
-	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
-	done
-install: install-am
-install-exec: install-exec-am
-install-data: install-data-am
-uninstall: uninstall-am
-
-install-am: all-am
-	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
-
-installcheck: installcheck-am
-install-strip:
-	if test -z '$(STRIP)'; then \
-	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
-	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
-	      install; \
-	else \
-	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
-	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
-	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
-	fi
-mostlyclean-generic:
-
-clean-generic:
-
-distclean-generic:
-	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
-	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
-
-maintainer-clean-generic:
-	@echo "This command is intended for maintainers to use"
-	@echo "it deletes files that may require special tools to rebuild."
-	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
-clean: clean-am
-
-clean-am: clean-generic clean-libtool clean-sbinPROGRAMS \
-	mostlyclean-am
-
-distclean: distclean-am
-		-rm -f ./$(DEPDIR)/openvpnserv-automatic.Po
-	-rm -f ./$(DEPDIR)/openvpnserv-block_dns.Po
-	-rm -f ./$(DEPDIR)/openvpnserv-common.Po
-	-rm -f ./$(DEPDIR)/openvpnserv-interactive.Po
-	-rm -f ./$(DEPDIR)/openvpnserv-service.Po
-	-rm -f ./$(DEPDIR)/openvpnserv-validate.Po
-	-rm -f Makefile
-distclean-am: clean-am distclean-compile distclean-generic \
-	distclean-tags
-
-dvi: dvi-am
-
-dvi-am:
-
-html: html-am
-
-html-am:
-
-info: info-am
-
-info-am:
-
-install-data-am:
-
-install-dvi: install-dvi-am
-
-install-dvi-am:
-
-install-exec-am: install-sbinPROGRAMS
-
-install-html: install-html-am
-
-install-html-am:
-
-install-info: install-info-am
-
-install-info-am:
-
-install-man:
-
-install-pdf: install-pdf-am
-
-install-pdf-am:
-
-install-ps: install-ps-am
-
-install-ps-am:
-
-installcheck-am:
-
-maintainer-clean: maintainer-clean-am
-		-rm -f ./$(DEPDIR)/openvpnserv-automatic.Po
-	-rm -f ./$(DEPDIR)/openvpnserv-block_dns.Po
-	-rm -f ./$(DEPDIR)/openvpnserv-common.Po
-	-rm -f ./$(DEPDIR)/openvpnserv-interactive.Po
-	-rm -f ./$(DEPDIR)/openvpnserv-service.Po
-	-rm -f ./$(DEPDIR)/openvpnserv-validate.Po
-	-rm -f Makefile
-maintainer-clean-am: distclean-am maintainer-clean-generic
-
-mostlyclean: mostlyclean-am
-
-mostlyclean-am: mostlyclean-compile mostlyclean-generic \
-	mostlyclean-libtool
-
-pdf: pdf-am
-
-pdf-am:
-
-ps: ps-am
-
-ps-am:
-
-uninstall-am: uninstall-sbinPROGRAMS
-
-.MAKE: install-am install-strip
-
-.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
-	clean-generic clean-libtool clean-sbinPROGRAMS cscopelist-am \
-	ctags ctags-am distclean distclean-compile distclean-generic \
-	distclean-libtool distclean-tags distdir dvi dvi-am html \
-	html-am info info-am install install-am install-data \
-	install-data-am install-dvi install-dvi-am install-exec \
-	install-exec-am install-html install-html-am install-info \
-	install-info-am install-man install-pdf install-pdf-am \
-	install-ps install-ps-am install-sbinPROGRAMS install-strip \
-	installcheck installcheck-am installdirs maintainer-clean \
-	maintainer-clean-generic mostlyclean mostlyclean-compile \
-	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
-	tags tags-am uninstall uninstall-am uninstall-sbinPROGRAMS
-
-.PRECIOUS: Makefile
-
-
-.rc.lo:
-	$(LTRCCOMPILE) -i "$<" -o "$@"
-
-.rc.o:
-	$(RCCOMPILE) -i "$<" -o "$@"
-
-.mc.rc:
-	$(WINDMC) "$<"
-
-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
-.NOEXPORT:
diff --git a/src/openvpnserv/automatic.c b/src/openvpnserv/automatic.c
index 5569ce9..3f2ca34 100644
--- a/src/openvpnserv/automatic.c
+++ b/src/openvpnserv/automatic.c
@@ -36,13 +36,9 @@
 
 #include <stdio.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <process.h>
 
-/* bool definitions */
-#define bool int
-#define true 1
-#define false 0
-
 static SERVICE_STATUS_HANDLE service;
 static SERVICE_STATUS status = { .dwServiceType = SERVICE_WIN32_SHARE_PROCESS };
 
@@ -115,41 +111,36 @@ close_if_open(HANDLE h)
 static bool
 match(const WIN32_FIND_DATA *find, LPCTSTR ext)
 {
-    int i;
-
     if (find->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
     {
         return false;
     }
 
-    if (!_tcslen(ext))
+    if (*ext == TEXT('\0'))
     {
         return true;
     }
 
-    i = _tcslen(find->cFileName) - _tcslen(ext) - 1;
-    if (i < 1)
-    {
-        return false;
-    }
+    /* find the pointer to that last '.' in filename and match ext against the rest */
 
-    return find->cFileName[i] == '.' && !_tcsicmp(find->cFileName + i + 1, ext);
+    const TCHAR *p = _tcsrchr(find->cFileName, TEXT('.'));
+    return p && p != find->cFileName && _tcsicmp(p + 1, ext) == 0;
 }
 
 /*
  * Modify the extension on a filename.
  */
 static bool
-modext(LPTSTR dest, int size, LPCTSTR src, LPCTSTR newext)
+modext(LPTSTR dest, size_t size, LPCTSTR src, LPCTSTR newext)
 {
-    int i;
+    size_t i;
 
     if (size > 0 && (_tcslen(src) + 1) <= size)
     {
         _tcscpy(dest, src);
         dest [size - 1] = TEXT('\0');
         i = _tcslen(dest);
-        while (--i >= 0)
+        while (i-- > 0)
         {
             if (dest[i] == TEXT('\\'))
             {
diff --git a/src/openvpnserv/common.c b/src/openvpnserv/common.c
index eb718d4..958643d 100644
--- a/src/openvpnserv/common.c
+++ b/src/openvpnserv/common.c
@@ -31,7 +31,7 @@ static wchar_t win_sys_path[MAX_PATH];
  * These are necessary due to certain buggy implementations of (v)snprintf,
  * that don't guarantee null termination for size > 0.
  */
-int
+BOOL
 openvpn_vsntprintf(LPTSTR str, size_t size, LPCTSTR format, va_list arglist)
 {
     int len = -1;
@@ -40,20 +40,36 @@ openvpn_vsntprintf(LPTSTR str, size_t size, LPCTSTR format, va_list arglist)
         len = _vsntprintf(str, size, format, arglist);
         str[size - 1] = 0;
     }
-    return (len >= 0 && len < size);
+    return (len >= 0 && (size_t)len < size);
 }
-int
+
+BOOL
 openvpn_sntprintf(LPTSTR str, size_t size, LPCTSTR format, ...)
 {
     va_list arglist;
+    BOOL res = FALSE;
+    if (size > 0)
+    {
+        va_start(arglist, format);
+        res = openvpn_vsntprintf(str, size, format, arglist);
+        va_end(arglist);
+    }
+    return res;
+}
+
+BOOL
+openvpn_swprintf(wchar_t *const str, const size_t size, const wchar_t *const format, ...)
+{
+    va_list arglist;
     int len = -1;
     if (size > 0)
     {
         va_start(arglist, format);
-        len = openvpn_vsntprintf(str, size, format, arglist);
+        len = vswprintf(str, size, format, arglist);
         va_end(arglist);
+        str[size - 1] = L'\0';
     }
-    return len;
+    return (len >= 0 && len < size);
 }
 
 static DWORD
@@ -65,7 +81,7 @@ GetRegString(HKEY key, LPCTSTR value, LPTSTR data, DWORD size, LPCTSTR default_v
     if (status == ERROR_FILE_NOT_FOUND && default_value)
     {
         size_t len = size/sizeof(data[0]);
-        if (openvpn_sntprintf(data, len, default_value) > 0)
+        if (openvpn_sntprintf(data, len, default_value))
         {
             status = ERROR_SUCCESS;
         }
diff --git a/src/openvpnserv/interactive.c b/src/openvpnserv/interactive.c
index aecbd84..207cc4a 100644
--- a/src/openvpnserv/interactive.c
+++ b/src/openvpnserv/interactive.c
@@ -24,7 +24,6 @@
 
 #include "service.h"
 
-#include <winsock2.h>
 #include <ws2tcpip.h>
 #include <iphlpapi.h>
 #include <userenv.h>
@@ -44,13 +43,14 @@
 #include "openvpn-msg.h"
 #include "validate.h"
 #include "block_dns.h"
+#include "ring_buffer.h"
 
 #define IO_TIMEOUT  2000 /*ms*/
 
-#define ERROR_OPENVPN_STARTUP  0x20000000
-#define ERROR_STARTUP_DATA     0x20000001
-#define ERROR_MESSAGE_DATA     0x20000002
-#define ERROR_MESSAGE_TYPE     0x20000003
+#define ERROR_OPENVPN_STARTUP        0x20000000
+#define ERROR_STARTUP_DATA           0x20000001
+#define ERROR_MESSAGE_DATA           0x20000002
+#define ERROR_MESSAGE_TYPE           0x20000003
 
 static SERVICE_STATUS_HANDLE service;
 static SERVICE_STATUS status = { .dwServiceType = SERVICE_WIN32_SHARE_PROCESS };
@@ -59,6 +59,7 @@ static settings_t settings;
 static HANDLE rdns_semaphore = NULL;
 #define RDNS_TIMEOUT 600  /* seconds to wait for the semaphore */
 
+#define TUN_IOCTL_REGISTER_RINGS CTL_CODE(51820U, 0x970U, METHOD_BUFFERED, FILE_READ_DATA | FILE_WRITE_DATA)
 
 openvpn_service_t interactive_service = {
     interactive,
@@ -101,6 +102,14 @@ typedef struct {
     int metric_v6;
 } block_dns_data_t;
 
+typedef struct {
+    HANDLE send_ring_handle;
+    HANDLE receive_ring_handle;
+    HANDLE send_tail_moved;
+    HANDLE receive_tail_moved;
+    HANDLE device;
+} ring_buffer_handles_t;
+
 
 static DWORD
 AddListItem(list_item_t **pfirst, LPVOID data)
@@ -155,6 +164,26 @@ CloseHandleEx(LPHANDLE handle)
     return INVALID_HANDLE_VALUE;
 }
 
+static HANDLE
+OvpnUnmapViewOfFile(LPHANDLE handle)
+{
+    if (handle && *handle && *handle != INVALID_HANDLE_VALUE)
+    {
+        UnmapViewOfFile(*handle);
+        *handle = INVALID_HANDLE_VALUE;
+    }
+    return INVALID_HANDLE_VALUE;
+}
+
+static void
+CloseRingBufferHandles(ring_buffer_handles_t *ring_buffer_handles)
+{
+    CloseHandleEx(&ring_buffer_handles->device);
+    CloseHandleEx(&ring_buffer_handles->receive_tail_moved);
+    CloseHandleEx(&ring_buffer_handles->send_tail_moved);
+    OvpnUnmapViewOfFile(&ring_buffer_handles->send_ring_handle);
+    OvpnUnmapViewOfFile(&ring_buffer_handles->receive_ring_handle);
+}
 
 static HANDLE
 InitOverlapped(LPOVERLAPPED overlapped)
@@ -188,7 +217,7 @@ typedef enum {
 static DWORD
 AsyncPipeOp(async_op_t op, HANDLE pipe, LPVOID buffer, DWORD size, DWORD count, LPHANDLE events)
 {
-    int i;
+    DWORD i;
     BOOL success;
     HANDLE io_event;
     DWORD res, bytes = 0;
@@ -277,10 +306,9 @@ ReturnProcessId(HANDLE pipe, DWORD pid, DWORD count, LPHANDLE events)
      * Same format as error messages (3 line string) with error = 0 in
      * 0x%08x format, PID on line 2 and a description "Process ID" on line 3
      */
-    swprintf(buf, _countof(buf), L"0x%08x\n0x%08x\n%s", 0, pid, msg);
-    buf[_countof(buf) - 1] = '\0';
+    openvpn_swprintf(buf, _countof(buf), L"0x%08x\n0x%08x\n%s", 0, pid, msg);
 
-    WritePipeAsync(pipe, buf, wcslen(buf) * 2, count, events);
+    WritePipeAsync(pipe, buf, (DWORD)(wcslen(buf) * 2), count, events);
 }
 
 static VOID
@@ -308,7 +336,7 @@ ReturnError(HANDLE pipe, DWORD error, LPCWSTR func, DWORD count, LPHANDLE events
                                 L"0x%1!08x!\n%2!s!\n%3!s!", 0, 0,
                                 (LPWSTR) &result, 0, (va_list *) args);
 
-    WritePipeAsync(pipe, result, wcslen(result) * 2, count, events);
+    WritePipeAsync(pipe, result, (DWORD)(wcslen(result) * 2), count, events);
 #ifdef UNICODE
     MsgToEventLog(MSG_FLAGS_ERROR, result);
 #else
@@ -332,31 +360,6 @@ ReturnLastError(HANDLE pipe, LPCWSTR func)
     ReturnError(pipe, GetLastError(), func, 1, &exit_event);
 }
 
-
-static VOID
-ReturnOpenvpnOutput(HANDLE pipe, HANDLE ovpn_output, DWORD count, LPHANDLE events)
-{
-    WCHAR *wide_output = NULL;
-    CHAR output[512];
-    DWORD size;
-
-    ReadFile(ovpn_output, output, sizeof(output), &size, NULL);
-    if (size == 0)
-    {
-        return;
-    }
-
-    wide_output = malloc((size) * sizeof(WCHAR));
-    if (wide_output)
-    {
-        MultiByteToWideChar(CP_UTF8, 0, output, size, wide_output, size);
-        wide_output[size - 1] = 0;
-    }
-
-    ReturnError(pipe, ERROR_OPENVPN_STARTUP, wide_output, count, events);
-    free(wide_output);
-}
-
 /*
  * Validate options against a white list. Also check the config_file is
  * inside the config_dir. The white list is defined in validate.c
@@ -381,10 +384,9 @@ ValidateOptions(HANDLE pipe, const WCHAR *workdir, const WCHAR *options, WCHAR *
 
     if (!argv)
     {
-        swprintf(errmsg, capacity,
-	         L"Cannot validate options: CommandLineToArgvW failed with error = 0x%08x",
-	         GetLastError());
-        errmsg[capacity-1] = L'\0';
+        openvpn_swprintf(errmsg, capacity,
+	                 L"Cannot validate options: CommandLineToArgvW failed with error = 0x%08x",
+	                 GetLastError());
         goto out;
     }
 
@@ -404,9 +406,8 @@ ValidateOptions(HANDLE pipe, const WCHAR *workdir, const WCHAR *options, WCHAR *
 
         if (!CheckOption(workdir, 2, argv_tmp, &settings))
         {
-            swprintf(errmsg, capacity, msg1, argv[0], workdir,
-                     settings.ovpn_admin_group);
-            errmsg[capacity-1] = L'\0';
+            openvpn_swprintf(errmsg, capacity, msg1, argv[0], workdir,
+                             settings.ovpn_admin_group);
         }
         goto out;
     }
@@ -422,15 +423,14 @@ ValidateOptions(HANDLE pipe, const WCHAR *workdir, const WCHAR *options, WCHAR *
         {
             if (wcscmp(L"--config", argv[i]) == 0 && argc-i > 1)
             {
-                swprintf(errmsg, capacity, msg1, argv[i+1], workdir,
-                         settings.ovpn_admin_group);
+                openvpn_swprintf(errmsg, capacity, msg1, argv[i+1], workdir,
+                                 settings.ovpn_admin_group);
             }
             else
             {
-                swprintf(errmsg, capacity, msg2, argv[i],
-                         settings.ovpn_admin_group);
+                openvpn_swprintf(errmsg, capacity, msg2, argv[i],
+                                 settings.ovpn_admin_group);
             }
-            errmsg[capacity-1] = L'\0';
             goto out;
         }
     }
@@ -449,9 +449,9 @@ out:
 static BOOL
 GetStartupData(HANDLE pipe, STARTUP_DATA *sud)
 {
-    size_t len;
+    size_t size, len;
     WCHAR *data = NULL;
-    DWORD size, bytes, read;
+    DWORD bytes, read;
 
     bytes = PeekNamedPipeAsync(pipe, 1, &exit_event);
     if (bytes == 0)
@@ -516,7 +516,7 @@ GetStartupData(HANDLE pipe, STARTUP_DATA *sud)
     return TRUE;
 
 err:
-    sud->directory = NULL;		/* caller must not free() */
+    sud->directory = NULL;              /* caller must not free() */
     free(data);
     return FALSE;
 }
@@ -930,7 +930,7 @@ static DWORD WINAPI
 RegisterDNS(LPVOID unused)
 {
     DWORD err;
-    DWORD i;
+    size_t i;
     DWORD timeout = RDNS_TIMEOUT * 1000; /* in milliseconds */
 
     /* path of ipconfig command */
@@ -945,17 +945,15 @@ RegisterDNS(LPVOID unused)
         { ipcfg, L"ipconfig /flushdns",    timeout },
         { ipcfg, L"ipconfig /registerdns", timeout },
     };
-    int ncmds = sizeof(cmds) / sizeof(cmds[0]);
 
     HANDLE wait_handles[2] = {rdns_semaphore, exit_event};
 
-    swprintf(ipcfg, _countof(ipcfg), L"%s\\%s", get_win_sys_path(), L"ipconfig.exe");
-    ipcfg[_countof(ipcfg) - 1] = L'\0';
+    openvpn_swprintf(ipcfg, MAX_PATH, L"%s\\%s", get_win_sys_path(), L"ipconfig.exe");
 
     if (WaitForMultipleObjects(2, wait_handles, FALSE, timeout) == WAIT_OBJECT_0)
     {
         /* Semaphore locked */
-        for (i = 0; i < ncmds; ++i)
+        for (i = 0; i < _countof(cmds); ++i)
         {
             ExecCommand(cmds[i].argv0, cmds[i].cmdline, cmds[i].timeout);
         }
@@ -1038,7 +1036,7 @@ netsh_dns_cmd(const wchar_t *action, const wchar_t *proto, const wchar_t *if_nam
     const wchar_t *fmt = L"netsh interface %s %s dns \"%s\" %s";
 
     /* max cmdline length in wchars -- include room for worst case and some */
-    int ncmdline = wcslen(fmt) + wcslen(if_name) + wcslen(addr) + 32 + 1;
+    size_t ncmdline = wcslen(fmt) + wcslen(if_name) + wcslen(addr) + 32 + 1;
     cmdline = malloc(ncmdline*sizeof(wchar_t));
     if (!cmdline)
     {
@@ -1202,8 +1200,118 @@ HandleEnableDHCPMessage(const enable_dhcp_message_t *dhcp)
     return err;
 }
 
+static DWORD
+OvpnDuplicateHandle(HANDLE ovpn_proc, HANDLE orig_handle, HANDLE* new_handle)
+{
+    DWORD err = ERROR_SUCCESS;
+
+    if (!DuplicateHandle(ovpn_proc, orig_handle, GetCurrentProcess(), new_handle, 0, FALSE, DUPLICATE_SAME_ACCESS))
+    {
+        err = GetLastError();
+        MsgToEventLog(M_SYSERR, TEXT("Could not duplicate handle"));
+        return err;
+    }
+
+    return err;
+}
+
+static DWORD
+DuplicateAndMapRing(HANDLE ovpn_proc, HANDLE orig_handle, HANDLE *new_handle, struct tun_ring **ring)
+{
+    DWORD err = ERROR_SUCCESS;
+
+    err = OvpnDuplicateHandle(ovpn_proc, orig_handle, new_handle);
+    if (err != ERROR_SUCCESS)
+    {
+        return err;
+    }
+    *ring = (struct tun_ring *)MapViewOfFile(*new_handle, FILE_MAP_ALL_ACCESS, 0, 0, sizeof(struct tun_ring));
+    if (*ring == NULL)
+    {
+        err = GetLastError();
+        MsgToEventLog(M_SYSERR, TEXT("Could not map shared memory"));
+        return err;
+    }
+
+    return err;
+}
+
+static DWORD
+HandleRegisterRingBuffers(const register_ring_buffers_message_t *rrb, HANDLE ovpn_proc,
+                          ring_buffer_handles_t *ring_buffer_handles)
+{
+    DWORD err = 0;
+    struct tun_ring *send_ring;
+    struct tun_ring *receive_ring;
+
+    CloseRingBufferHandles(ring_buffer_handles);
+
+    err = OvpnDuplicateHandle(ovpn_proc, rrb->device, &ring_buffer_handles->device);
+    if (err != ERROR_SUCCESS)
+    {
+        return err;
+    }
+
+    err = DuplicateAndMapRing(ovpn_proc, rrb->send_ring_handle, &ring_buffer_handles->send_ring_handle, &send_ring);
+    if (err != ERROR_SUCCESS)
+    {
+        return err;
+    }
+
+    err = DuplicateAndMapRing(ovpn_proc, rrb->receive_ring_handle, &ring_buffer_handles->receive_ring_handle, &receive_ring);
+    if (err != ERROR_SUCCESS)
+    {
+        return err;
+    }
+
+    err = OvpnDuplicateHandle(ovpn_proc, rrb->send_tail_moved, &ring_buffer_handles->send_tail_moved);
+    if (err != ERROR_SUCCESS)
+    {
+        return err;
+    }
+
+    err = OvpnDuplicateHandle(ovpn_proc, rrb->receive_tail_moved, &ring_buffer_handles->receive_tail_moved);
+    if (err != ERROR_SUCCESS)
+    {
+        return err;
+    }
+
+    if (!register_ring_buffers(ring_buffer_handles->device, send_ring, receive_ring,
+                               ring_buffer_handles->send_tail_moved, ring_buffer_handles->receive_tail_moved))
+    {
+        err = GetLastError();
+        MsgToEventLog(M_SYSERR, TEXT("Could not register ring buffers"));
+    }
+
+    return err;
+}
+
+static DWORD
+HandleMTUMessage(const set_mtu_message_t *mtu)
+{
+    DWORD err = 0;
+    MIB_IPINTERFACE_ROW ipiface;
+    InitializeIpInterfaceEntry(&ipiface);
+    ipiface.Family = mtu->family;
+    ipiface.InterfaceIndex = mtu->iface.index;
+    err = GetIpInterfaceEntry(&ipiface);
+    if (err != NO_ERROR)
+    {
+        return err;
+    }
+    if (mtu->family == AF_INET)
+    {
+        ipiface.SitePrefixLength = 0;
+    }
+    ipiface.NlMtu = mtu->mtu;
+
+    err = SetIpInterfaceEntry(&ipiface);
+    return err;
+}
+
 static VOID
-HandleMessage(HANDLE pipe, DWORD bytes, DWORD count, LPHANDLE events, undo_lists_t *lists)
+HandleMessage(HANDLE pipe, HANDLE ovpn_proc, ring_buffer_handles_t *ring_buffer_handles,
+              DWORD bytes, DWORD count, LPHANDLE events, undo_lists_t *lists)
 {
     DWORD read;
     union {
@@ -1214,6 +1322,8 @@ HandleMessage(HANDLE pipe, DWORD bytes, DWORD count, LPHANDLE events, undo_lists
         block_dns_message_t block_dns;
         dns_cfg_message_t dns;
         enable_dhcp_message_t dhcp;
+        register_ring_buffers_message_t rrb;
+        set_mtu_message_t mtu;
     } msg;
     ack_message_t ack = {
         .header = {
@@ -1281,6 +1391,20 @@ HandleMessage(HANDLE pipe, DWORD bytes, DWORD count, LPHANDLE events, undo_lists
             }
             break;
 
+        case msg_register_ring_buffers:
+            if (msg.header.size == sizeof(msg.rrb))
+            {
+                ack.error_number = HandleRegisterRingBuffers(&msg.rrb, ovpn_proc, ring_buffer_handles);
+            }
+            break;
+
+        case msg_set_mtu:
+            if (msg.header.size == sizeof(msg.mtu))
+            {
+                ack.error_number = HandleMTUMessage(&msg.mtu);
+            }
+            break;
+
         default:
             ack.error_number = ERROR_MESSAGE_TYPE;
             MsgToEventLog(MSG_FLAGS_ERROR, TEXT("Unknown message type %d"), msg.header.type);
@@ -1322,7 +1446,7 @@ Undo(undo_lists_t *lists)
                     break;
 
                 case block_dns:
-                    interface_data = (block_dns_data_t*)(item->data);
+                    interface_data = (block_dns_data_t *)(item->data);
                     delete_block_dns_filters(interface_data->engine);
                     if (interface_data->metric_v4 >= 0)
                     {
@@ -1364,6 +1488,7 @@ RunOpenvpn(LPVOID p)
     WCHAR *cmdline = NULL;
     size_t cmdline_size;
     undo_lists_t undo_lists;
+    ring_buffer_handles_t ring_buffer_handles;
     WCHAR errmsg[512] = L"";
 
     SECURITY_ATTRIBUTES inheritable = {
@@ -1385,6 +1510,7 @@ RunOpenvpn(LPVOID p)
     ZeroMemory(&startup_info, sizeof(startup_info));
     ZeroMemory(&undo_lists, sizeof(undo_lists));
     ZeroMemory(&proc_info, sizeof(proc_info));
+    ZeroMemory(&ring_buffer_handles, sizeof(ring_buffer_handles));
 
     if (!GetStartupData(pipe, &sud))
     {
@@ -1611,7 +1737,7 @@ RunOpenvpn(LPVOID p)
     {
         DWORD written;
         WideCharToMultiByte(CP_UTF8, 0, sud.std_input, -1, input, input_size, NULL, NULL);
-        WriteFile(stdin_write, input, strlen(input), &written, NULL);
+        WriteFile(stdin_write, input, (DWORD)strlen(input), &written, NULL);
         free(input);
     }
 
@@ -1623,7 +1749,7 @@ RunOpenvpn(LPVOID p)
             break;
         }
 
-        HandleMessage(ovpn_pipe, bytes, 1, &exit_event, &undo_lists);
+        HandleMessage(ovpn_pipe, proc_info.hProcess, &ring_buffer_handles, bytes, 1, &exit_event, &undo_lists);
     }
 
     WaitForSingleObject(proc_info.hProcess, IO_TIMEOUT);
@@ -1635,9 +1761,8 @@ RunOpenvpn(LPVOID p)
     else if (exit_code != 0)
     {
         WCHAR buf[256];
-        swprintf(buf, _countof(buf),
-                 L"OpenVPN exited with error: exit code = %lu", exit_code);
-        buf[_countof(buf) - 1] =  L'\0';
+        openvpn_swprintf(buf, _countof(buf),
+                         L"OpenVPN exited with error: exit code = %lu", exit_code);
         ReturnError(pipe, ERROR_OPENVPN_STARTUP, buf, 1, &exit_event);
     }
     Undo(&undo_lists);
@@ -1651,6 +1776,7 @@ out:
     free(cmdline);
     DestroyEnvironmentBlock(user_env);
     FreeStartupData(&sud);
+    CloseRingBufferHandles(&ring_buffer_handles);
     CloseHandleEx(&proc_info.hProcess);
     CloseHandleEx(&proc_info.hThread);
     CloseHandleEx(&stdin_read);
diff --git a/src/openvpnserv/openvpnserv.vcxproj b/src/openvpnserv/openvpnserv.vcxproj
index c6760da..5e973df 100644
--- a/src/openvpnserv/openvpnserv.vcxproj
+++ b/src/openvpnserv/openvpnserv.vcxproj
@@ -1,103 +1,132 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{9C91EE0B-817D-420A-A1E6-15A5A9D98BAD}</ProjectGuid>
     <RootNamespace>openvpnserv</RootNamespace>
     <Keyword>Win32Proj</Keyword>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
-    <CharacterSet>MultiByte</CharacterSet>
+    <CharacterSet>Unicode</CharacterSet>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v142</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <CharacterSet>Unicode</CharacterSet>
     <WholeProgramOptimization>true</WholeProgramOptimization>
-    <PlatformToolset>v120</PlatformToolset>
+    <PlatformToolset>v142</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
-    <CharacterSet>MultiByte</CharacterSet>
-    <PlatformToolset>v120</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+    <PlatformToolset>v142</PlatformToolset>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <CharacterSet>Unicode</CharacterSet>
+    <PlatformToolset>v142</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\compat\Release.props" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\compat\Release.props" />
   </ImportGroup>
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\compat\Debug.props" />
+  </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+    <Import Project="..\compat\Debug.props" />
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup>
     <_ProjectFileVersion>10.0.30319.1</_ProjectFileVersion>
-    <OutDir Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">$(SolutionDir)$(Platform)-Output\$(Configuration)\</OutDir>
-    <IntDir Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">$(Configuration)\</IntDir>
-    <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</LinkIncremental>
-    <OutDir Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(SolutionDir)$(Platform)-Output\$(Configuration)\</OutDir>
-    <IntDir Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(Configuration)\</IntDir>
-    <LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">false</LinkIncremental>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
-      <Optimization>Disabled</Optimization>
-      <AdditionalIncludeDirectories>$(SOURCEBASE);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;$(CPPFLAGS);%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <MinimalRebuild>true</MinimalRebuild>
-      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
-      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <DebugInformationFormat>EditAndContinue</DebugInformationFormat>
+      <AdditionalIncludeDirectories>..\openvpn;..\compat;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
-    <ResourceCompile>
-      <AdditionalIncludeDirectories>$(SOURCEBASE);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-    </ResourceCompile>
+    <ResourceCompile />
     <Link>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>Userenv.lib;Iphlpapi.lib;ntdll.lib;Fwpuclnt.lib;Netapi32.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <ClCompile>
+      <AdditionalIncludeDirectories>..\openvpn;..\compat;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <ResourceCompile />
+    <Link>
+      <AdditionalDependencies>legacy_stdio_definitions.lib;Userenv.lib;Iphlpapi.lib;ntdll.lib;Fwpuclnt.lib;Netapi32.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <SubSystem>Console</SubSystem>
-      <TargetMachine>MachineX86</TargetMachine>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
-      <Optimization>MaxSpeed</Optimization>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <AdditionalIncludeDirectories>$(SOURCEBASE);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;$(CPPFLAGS);%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
+      <AdditionalIncludeDirectories>..\openvpn;..\compat;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <ResourceCompile />
+    <Link>
+      <AdditionalDependencies>Userenv.lib;Iphlpapi.lib;ntdll.lib;Fwpuclnt.lib;Netapi32.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <AdditionalIncludeDirectories>..\openvpn;..\compat;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
-    <ResourceCompile>
-      <AdditionalIncludeDirectories>$(SOURCEBASE);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-    </ResourceCompile>
+    <ResourceCompile />
     <Link>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>legacy_stdio_definitions.lib;Userenv.lib;Iphlpapi.lib;ntdll.lib;Fwpuclnt.lib;Netapi32.lib;Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <SubSystem>Console</SubSystem>
-      <OptimizeReferences>true</OptimizeReferences>
-      <EnableCOMDATFolding>true</EnableCOMDATFolding>
-      <TargetMachine>MachineX86</TargetMachine>
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
-    <ClCompile Include="openvpnserv.c" />
+    <ClCompile Include="automatic.c" />
+    <ClCompile Include="common.c" />
+    <ClCompile Include="interactive.c" />
     <ClCompile Include="service.c" />
+    <ClCompile Include="validate.c" />
+    <ClCompile Include="..\openvpn\block_dns.c" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="..\openvpn\ring_buffer.h" />
     <ClInclude Include="service.h" />
+    <ClInclude Include="validate.h" />
+    <ClInclude Include="..\openvpn\block_dns.h" />
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="openvpnserv_resources.rc" />
@@ -111,4 +140,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>
\ No newline at end of file
diff --git a/src/openvpnserv/openvpnserv.vcxproj.filters b/src/openvpnserv/openvpnserv.vcxproj.filters
index 0c89b4f..41ad3e8 100644
--- a/src/openvpnserv/openvpnserv.vcxproj.filters
+++ b/src/openvpnserv/openvpnserv.vcxproj.filters
@@ -15,10 +15,22 @@
     </Filter>
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="openvpnserv.c">
+    <ClCompile Include="service.c">
       <Filter>Source Files</Filter>
     </ClCompile>
-    <ClCompile Include="service.c">
+    <ClCompile Include="automatic.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="common.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="interactive.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="validate.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\openvpn\block_dns.c">
       <Filter>Source Files</Filter>
     </ClCompile>
   </ItemGroup>
@@ -26,6 +38,15 @@
     <ClInclude Include="service.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="validate.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\openvpn\block_dns.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\openvpn\ring_buffer.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="openvpnserv_resources.rc">
diff --git a/src/openvpnserv/service.c b/src/openvpnserv/service.c
index 7157bea..8efe25f 100644
--- a/src/openvpnserv/service.c
+++ b/src/openvpnserv/service.c
@@ -270,8 +270,8 @@ _tmain(int argc, TCHAR *argv[])
             else if (argc > i + 2 && _tcsicmp(TEXT("instance"), argv[i] + 1) == 0)
             {
                 dispatchTable = _tcsicmp(TEXT("interactive"), argv[i + 1]) != 0 ?
-                    dispatchTable_automatic :
-                    dispatchTable_interactive;
+                                dispatchTable_automatic :
+                                dispatchTable_interactive;
 
                 service_instance = argv[i + 2];
                 i += 2;
diff --git a/src/openvpnserv/service.h b/src/openvpnserv/service.h
index 23b105f..f5afe2f 100644
--- a/src/openvpnserv/service.h
+++ b/src/openvpnserv/service.h
@@ -30,6 +30,7 @@
 #include "config-msvc.h"
 #endif
 
+#include <winsock2.h>
 #include <windows.h>
 #include <stdlib.h>
 #include <tchar.h>
@@ -76,14 +77,18 @@ extern openvpn_service_t interactive_service;
 extern LPCTSTR service_instance;
 
 VOID WINAPI ServiceStartAutomaticOwn(DWORD argc, LPTSTR *argv);
+
 VOID WINAPI ServiceStartAutomatic(DWORD argc, LPTSTR *argv);
 
 VOID WINAPI ServiceStartInteractiveOwn(DWORD argc, LPTSTR *argv);
+
 VOID WINAPI ServiceStartInteractive(DWORD argc, LPTSTR *argv);
 
-int openvpn_vsntprintf(LPTSTR str, size_t size, LPCTSTR format, va_list arglist);
+BOOL openvpn_vsntprintf(LPTSTR str, size_t size, LPCTSTR format, va_list arglist);
+
+BOOL openvpn_sntprintf(LPTSTR str, size_t size, LPCTSTR format, ...);
 
-int openvpn_sntprintf(LPTSTR str, size_t size, LPCTSTR format, ...);
+BOOL openvpn_swprintf(wchar_t *const str, const size_t size, const wchar_t *const format, ...);
 
 DWORD GetOpenvpnSettings(settings_t *s);
 
diff --git a/src/openvpnserv/validate.c b/src/openvpnserv/validate.c
index d35938c..9b01770 100644
--- a/src/openvpnserv/validate.c
+++ b/src/openvpnserv/validate.c
@@ -51,6 +51,7 @@ static const WCHAR *white_list[] =
 };
 
 static BOOL IsUserInGroup(PSID sid, const PTOKEN_GROUPS groups, const WCHAR *group_name);
+
 static PTOKEN_GROUPS GetTokenGroups(const HANDLE token);
 
 /*
@@ -63,12 +64,14 @@ CheckConfigPath(const WCHAR *workdir, const WCHAR *fname, const settings_t *s)
     WCHAR tmp[MAX_PATH];
     const WCHAR *config_file = NULL;
     const WCHAR *config_dir = NULL;
+#ifndef UNICODE
+    WCHAR widepath[MAX_PATH];
+#endif
 
     /* convert fname to full path */
     if (PathIsRelativeW(fname) )
     {
-        swprintf(tmp, _countof(tmp), L"%s\\%s", workdir, fname);
-        tmp[_countof(tmp)-1] = L'\0';
+        openvpn_swprintf(tmp, _countof(tmp), L"%s\\%s", workdir, fname);
         config_file = tmp;
     }
     else
@@ -300,12 +303,12 @@ IsUserInGroup(PSID sid, const PTOKEN_GROUPS token_groups, const WCHAR *group_nam
             break;
         }
         /* If a match is already found, ret == TRUE and the loop is skipped */
-        for (int i = 0; i < nread && !ret; ++i)
+        for (DWORD i = 0; i < nread && !ret; ++i)
         {
             ret = EqualSid(members[i].lgrmi0_sid, sid);
         }
         NetApiBufferFree(members);
-    /* MSDN says the lookup should always iterate until err != ERROR_MORE_DATA */
+        /* MSDN says the lookup should always iterate until err != ERROR_MORE_DATA */
     } while (err == ERROR_MORE_DATA && nloop++ < 100);
 
     if (err != NERR_Success && err != NERR_GroupNotFound)