Refactor api

tun.go

@@ -2,9 +2,18 @@ package tun
 
 import (
 	"io"
+	"net"
+	"net/netip"
+	"runtime"
+	"sort"
+	"strconv"
+	"strings"
 
+	"github.com/sagernet/sing/common"
 	E "github.com/sagernet/sing/common/exceptions"
+	F "github.com/sagernet/sing/common/format"
 	N "github.com/sagernet/sing/common/network"
+	"github.com/sagernet/sing/common/ranges"
 )
 
 type Handler interface {
@@ -17,3 +26,75 @@ type Tun interface {
 	io.ReadWriter
 	Close() error
 }
+
+type WinTun interface {
+	Tun
+	ReadPacket() ([]byte, func(), error)
+}
+
+type Options struct {
+	Name               string
+	Inet4Address       netip.Prefix
+	Inet6Address       netip.Prefix
+	MTU                uint32
+	AutoRoute          bool
+	IncludeUID         []ranges.Range[uint32]
+	IncludeAndroidUser []int
+	ExcludeUID         []ranges.Range[uint32]
+}
+
+func (o Options) ExcludedRanges() (uidRanges []ranges.Range[uint32]) {
+	var includeAndroidUser []int
+	if runtime.GOOS == "android" {
+		includeAndroidUser = o.IncludeAndroidUser
+	}
+	return buildExcludedRanges(o.IncludeUID, o.ExcludeUID, includeAndroidUser)
+}
+
+const (
+	androidUserRange        = 100000
+	userEnd          uint32 = 0xFFFFFFFF - 1
+)
+
+func buildExcludedRanges(includeRanges []ranges.Range[uint32], excludeRanges []ranges.Range[uint32], includeAndroidUser []int) (uidRanges []ranges.Range[uint32]) {
+	if len(includeRanges) > 0 {
+		uidRanges = includeRanges
+	}
+	if len(includeAndroidUser) > 0 {
+		includeAndroidUser = common.Uniq(includeAndroidUser)
+		sort.Ints(includeAndroidUser)
+		for _, androidUser := range includeAndroidUser {
+			uidRanges = append(uidRanges, ranges.New[uint32](uint32(androidUser)*androidUserRange, uint32(androidUser+1)*androidUserRange-1))
+		}
+	}
+	if len(uidRanges) > 0 {
+		uidRanges = ranges.Exclude(uidRanges, excludeRanges)
+		uidRanges = ranges.Revert(0, userEnd, uidRanges)
+	} else {
+		uidRanges = excludeRanges
+	}
+	return ranges.Merge(uidRanges)
+}
+
+func DefaultInterfaceName() (tunName string) {
+	if runtime.GOOS == "darwin" {
+		tunName = "utun"
+	} else {
+		tunName = "tun"
+	}
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		return
+	}
+	var tunIndex int
+	for _, netInterface := range interfaces {
+		if strings.HasPrefix(netInterface.Name, tunName) {
+			index, parseErr := strconv.ParseInt(netInterface.Name[len(tunName):], 10, 16)
+			if parseErr == nil {
+				tunIndex = int(index) + 1
+			}
+		}
+	}
+	tunName = F.ToString(tunName, tunIndex)
+	return
+}