api: introduce logging

And other unifications with installer before merging.

Signed-off-by: Simon Rozman <simon@rozman.si>

1 files changed, 49 insertions, 0 deletions

diff --git a/api/logger.c b/api/logger.c
new file mode 100644
index 0000000..a4400b9
--- /dev/null
+++ b/api/logger.c
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2018-2020 WireGuard LLC. All Rights Reserved.
+ */
+
+#include "pch.h"
+
+static VOID CALLBACK
+NopLogger(_In_ WINTUN_LOGGER_LEVEL Level, _In_z_ const WCHAR *LogLine)
+{
+    UNREFERENCED_PARAMETER(Level);
+    UNREFERENCED_PARAMETER(LogLine);
+}
+
+WINTUN_LOGGER_FUNC Logger = NopLogger;
+
+VOID CALLBACK
+WintunSetLogger(_In_ WINTUN_LOGGER_FUNC NewLogger)
+{
+    Logger = NewLogger;
+}
+
+_Post_equals_last_error_ DWORD
+LoggerError(_In_z_ const WCHAR *Prefix, _In_ DWORD Error)
+{
+    WCHAR *SystemMessage = NULL, *FormattedMessage = NULL;
+    FormatMessageW(
+        FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_MAX_WIDTH_MASK,
+        NULL,
+        HRESULT_FROM_SETUPAPI(Error),
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+        (VOID *)&SystemMessage,
+        0,
+        NULL);
+    FormatMessageW(
+        FORMAT_MESSAGE_FROM_STRING | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_ARGUMENT_ARRAY |
+            FORMAT_MESSAGE_MAX_WIDTH_MASK,
+        SystemMessage ? L"%1: %3(Code 0x%2!08X!)" : L"%1: Code 0x%2!08X!",
+        0,
+        0,
+        (VOID *)&FormattedMessage,
+        0,
+        (va_list *)(DWORD_PTR[]){ (DWORD_PTR)Prefix, (DWORD_PTR)Error, (DWORD_PTR)SystemMessage });
+    if (FormattedMessage)
+        Logger(WINTUN_LOG_ERR, FormattedMessage);
+    LocalFree(FormattedMessage);
+    LocalFree(SystemMessage);
+    return Error;
+}