From 6ebec97500f10f07728f22690127d92672fdf93b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Wed, 17 Jan 2024 05:48:33 +0800
Subject: [PATCH] Fix timezone for Android and iOS

---
 constant/quic.go             |  5 +++++
 constant/quic_stub.go        |  5 +++++
 experimental/libbox/setup.go |  1 +
 inbound/naive.go             |  5 ++---
 include/quic.go              |  2 --
 include/quic_stub.go         |  2 --
 include/tz_android.go        | 21 +++++++++++++++++++++
 include/tz_ios.go            | 30 ++++++++++++++++++++++++++++++
 8 files changed, 64 insertions(+), 7 deletions(-)
 create mode 100644 constant/quic.go
 create mode 100644 constant/quic_stub.go
 create mode 100644 include/tz_android.go
 create mode 100644 include/tz_ios.go

diff --git a/constant/quic.go b/constant/quic.go
new file mode 100644
index 00000000..50bddf88
--- /dev/null
+++ b/constant/quic.go
@@ -0,0 +1,5 @@
+//go:build with_quic
+
+package constant
+
+const WithQUIC = true
diff --git a/constant/quic_stub.go b/constant/quic_stub.go
new file mode 100644
index 00000000..95b47fef
--- /dev/null
+++ b/constant/quic_stub.go
@@ -0,0 +1,5 @@
+//go:build !with_quic
+
+package constant
+
+const WithQUIC = false
diff --git a/experimental/libbox/setup.go b/experimental/libbox/setup.go
index a4514dfe..ea468f39 100644
--- a/experimental/libbox/setup.go
+++ b/experimental/libbox/setup.go
@@ -7,6 +7,7 @@ import (
 
 	"github.com/sagernet/sing-box/common/humanize"
 	C "github.com/sagernet/sing-box/constant"
+	_ "github.com/sagernet/sing-box/include"
 )
 
 var (
diff --git a/inbound/naive.go b/inbound/naive.go
index 36bda492..07328c09 100644
--- a/inbound/naive.go
+++ b/inbound/naive.go
@@ -15,7 +15,6 @@ import (
 	"github.com/sagernet/sing-box/common/tls"
 	"github.com/sagernet/sing-box/common/uot"
 	C "github.com/sagernet/sing-box/constant"
-	"github.com/sagernet/sing-box/include"
 	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing/common"
@@ -109,8 +108,8 @@ func (n *Naive) Start() error {
 
 	if common.Contains(n.network, N.NetworkUDP) {
 		err := n.configureHTTP3Listener()
-		if !include.WithQUIC && len(n.network) > 1 {
-			log.Warn(E.Cause(err, "naive http3 disabled"))
+		if !C.WithQUIC && len(n.network) > 1 {
+			n.logger.Warn(E.Cause(err, "naive http3 disabled"))
 		} else if err != nil {
 			return err
 		}
diff --git a/include/quic.go b/include/quic.go
index 1e507f7b..1bcc0fbc 100644
--- a/include/quic.go
+++ b/include/quic.go
@@ -6,5 +6,3 @@ import (
 	_ "github.com/sagernet/sing-box/transport/v2rayquic"
 	_ "github.com/sagernet/sing-dns/quic"
 )
-
-const WithQUIC = true
diff --git a/include/quic_stub.go b/include/quic_stub.go
index 682eb536..17b502a7 100644
--- a/include/quic_stub.go
+++ b/include/quic_stub.go
@@ -16,8 +16,6 @@ import (
 	N "github.com/sagernet/sing/common/network"
 )
 
-const WithQUIC = false
-
 func init() {
 	dns.RegisterTransport([]string{"quic", "h3"}, func(name string, ctx context.Context, logger logger.ContextLogger, dialer N.Dialer, link string) (dns.Transport, error) {
 		return nil, C.ErrQUICNotIncluded
diff --git a/include/tz_android.go b/include/tz_android.go
new file mode 100644
index 00000000..7be1c2da
--- /dev/null
+++ b/include/tz_android.go
@@ -0,0 +1,21 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// kanged from https://github.com/golang/mobile/blob/c713f31d574bb632a93f169b2cc99c9e753fef0e/app/android.go#L89
+
+package include
+
+// #include <time.h>
+import "C"
+import "time"
+
+func init() {
+	var currentT C.time_t
+	var currentTM C.struct_tm
+	C.time(&currentT)
+	C.localtime_r(&currentT, &currentTM)
+	tzOffset := int(currentTM.tm_gmtoff)
+	tz := C.GoString(currentTM.tm_zone)
+	time.Local = time.FixedZone(tz, tzOffset)
+}
diff --git a/include/tz_ios.go b/include/tz_ios.go
new file mode 100644
index 00000000..fc30479c
--- /dev/null
+++ b/include/tz_ios.go
@@ -0,0 +1,30 @@
+package include
+
+/*
+#cgo CFLAGS: -x objective-c
+#cgo LDFLAGS: -framework Foundation
+#import <Foundation/Foundation.h>
+const char* getSystemTimeZone() {
+    NSTimeZone *timeZone = [NSTimeZone systemTimeZone];
+    NSString *timeZoneName = [timeZone description];
+    return [timeZoneName UTF8String];
+}
+*/
+import "C"
+
+import (
+	"strings"
+	"time"
+)
+
+func init() {
+	tzDescription := C.GoString(C.getSystemTimeZone())
+	if len(tzDescription) == 0 {
+		return
+	}
+	location, err := time.LoadLocation(strings.Split(tzDescription, " ")[0])
+	if err != nil {
+		return
+	}
+	time.Local = location
+}