1 files changed, 47 insertions, 0 deletions
diff --git a/services/boot.go b/services/boot.go
new file mode 100644
index 00000000..ae7aadda
--- /dev/null
+++ b/services/boot.go
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019-2022 WireGuard LLC. All Rights Reserved.
+ */
+
+package services
+
+import (
+	"errors"
+	"log"
+	"sync"
+	"time"
+
+	"golang.org/x/sys/windows"
+	"golang.org/x/sys/windows/svc"
+	"golang.zx2c4.com/wireguard/windows/version"
+)
+
+var (
+	startedAtBoot     bool
+	startedAtBootOnce sync.Once
+)
+
+func StartedAtBoot() bool {
+	startedAtBootOnce.Do(func() {
+		if isService, err := svc.IsWindowsService(); err == nil && !isService {
+			return
+		}
+		if reason, err := svc.DynamicStartReason(); err == nil {
+			startedAtBoot = (reason&svc.StartReasonAuto) != 0 || (reason&svc.StartReasonDelayedAuto) != 0
+		} else if errors.Is(err, windows.ERROR_PROC_NOT_FOUND) {
+			// TODO: Below this line is Windows 7 compatibility code, which hopefully we can delete at some point.
+			startedAtBoot = windows.DurationSinceBoot() < time.Minute*10
+		} else {
+			log.Printf("Unable to determine service start reason: %v", err)
+		}
+	})
+	return startedAtBoot
+}
+
+func PrintStarting() {
+	boot := ""
+	if StartedAtBoot() {
+		boot = " at boot"
+	}
+	log.Printf("Starting%s %s", boot, version.UserAgent())
+}