feat(client): send logs to syslog

closes #2255

util/log.go

@@ -2,10 +2,13 @@ package util
 
 import (
 	"io"
+	"log/syslog"
 	"os"
 	"path/filepath"
+	"slices"
 
 	log "github.com/sirupsen/logrus"
+	lSyslog "github.com/sirupsen/logrus/hooks/syslog"
 	"gopkg.in/natefinch/lumberjack.v2"
 
 	"github.com/netbirdio/netbird/formatter"
@@ -18,8 +21,9 @@ func InitLog(logLevel string, logPath string) error {
 		log.Errorf("Failed parsing log-level %s: %s", logLevel, err)
 		return err
 	}
+	custom_outputs := []string{"console", "syslog"};
 
-	if logPath != "" && logPath != "console" {
+	if logPath != "" && !slices.Contains(custom_outputs, logPath) {
 		lumberjackLogger := &lumberjack.Logger{
 			// Log file absolute path, os agnostic
 			Filename:   filepath.ToSlash(logPath),
@@ -29,6 +33,13 @@ func InitLog(logLevel string, logPath string) error {
 			Compress:   true,
 		}
 		log.SetOutput(io.Writer(lumberjackLogger))
+	} else if logPath == "syslog" {
+		hook, err := lSyslog.NewSyslogHook("", "", syslog.LOG_INFO, "")
+
+		if err != nil {
+			log.Errorf("Failed creating syslog hook: %s", err)
+		}
+		log.AddHook(hook)
 	}
 
 	if os.Getenv("NB_LOG_FORMAT") == "json" {