From c1e097d6d0cabb81b3aa180d69107f9857606bf5 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Mon, 14 May 2018 03:38:06 +0200
Subject: [PATCH] Optional logging even in background

---
 logger.go |  8 ++++++--
 main.go   | 13 ++++++++++---
 uapi.go   |  1 -
 3 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/logger.go b/logger.go
index b8012aa..849f674 100644
--- a/logger.go
+++ b/logger.go
@@ -13,7 +13,8 @@ import (
 )
 
 const (
-	LogLevelError = iota
+	LogLevelSilent = iota
+	LogLevelError
 	LogLevelInfo
 	LogLevelDebug
 )
@@ -35,7 +36,10 @@ func NewLogger(level int, prepend string) *Logger {
 		if level >= LogLevelInfo {
 			return output, output, ioutil.Discard
 		}
-		return output, ioutil.Discard, ioutil.Discard
+		if level >= LogLevelError {
+			return output, ioutil.Discard, ioutil.Discard
+		}
+		return ioutil.Discard, ioutil.Discard, ioutil.Discard
 	}()
 
 	logger.Debug = log.New(logDebug,
diff --git a/main.go b/main.go
index 5001bc4..6c7b07d 100644
--- a/main.go
+++ b/main.go
@@ -111,6 +111,8 @@ func main() {
 			return LogLevelInfo
 		case "error":
 			return LogLevelError
+		case "silent":
+			return LogLevelSilent
 		}
 		return LogLevelInfo
 	}()
@@ -183,11 +185,16 @@ func main() {
 		env = append(env, fmt.Sprintf("%s=3", ENV_WG_TUN_FD))
 		env = append(env, fmt.Sprintf("%s=4", ENV_WG_UAPI_FD))
 		env = append(env, fmt.Sprintf("%s=1", ENV_WG_PROCESS_FOREGROUND))
+		files := [3]*os.File{}
+		if os.Getenv("LOG_LEVEL") != "" {
+			files[1] = os.Stdout
+			files[2] = os.Stderr
+		}
 		attr := &os.ProcAttr{
 			Files: []*os.File{
-				nil, // stdin
-				nil, // stdout
-				nil, // stderr
+				files[0], // stdin
+				files[1], // stdout
+				files[2], // stderr
 				tun.File(),
 				fileUAPI,
 			},
diff --git a/uapi.go b/uapi.go
index 9858f60..f846033 100644
--- a/uapi.go
+++ b/uapi.go
@@ -235,7 +235,6 @@ func ipcSetOperation(device *Device, socket *bufio.ReadWriter) *IPCError {
 				dummy = device.staticIdentity.publicKey.Equals(publicKey)
 				device.staticIdentity.mutex.RUnlock()
 
-
 				if dummy {
 					peer = &Peer{}
 				} else {