mirror of
https://github.com/SagerNet/sing-tun.git
synced 2025-04-04 04:17:39 +03:00
100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
package tun
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import (
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"io"
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"net"
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"net/netip"
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"runtime"
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"sort"
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"strconv"
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"strings"
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"github.com/sagernet/sing/common"
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E "github.com/sagernet/sing/common/exceptions"
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F "github.com/sagernet/sing/common/format"
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N "github.com/sagernet/sing/common/network"
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"github.com/sagernet/sing/common/ranges"
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)
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type Handler interface {
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N.TCPConnectionHandler
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N.UDPConnectionHandler
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E.Handler
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}
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type Tun interface {
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io.ReadWriter
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Close() error
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}
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type WinTun interface {
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Tun
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ReadPacket() ([]byte, func(), error)
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}
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type Options struct {
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Name string
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Inet4Address netip.Prefix
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Inet6Address netip.Prefix
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MTU uint32
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AutoRoute bool
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IncludeUID []ranges.Range[uint32]
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IncludeAndroidUser []int
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ExcludeUID []ranges.Range[uint32]
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}
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func (o Options) ExcludedRanges() (uidRanges []ranges.Range[uint32]) {
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var includeAndroidUser []int
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if runtime.GOOS == "android" {
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includeAndroidUser = o.IncludeAndroidUser
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}
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return buildExcludedRanges(o.IncludeUID, o.ExcludeUID, includeAndroidUser)
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}
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const (
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androidUserRange = 100000
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userEnd uint32 = 0xFFFFFFFF - 1
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)
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func buildExcludedRanges(includeRanges []ranges.Range[uint32], excludeRanges []ranges.Range[uint32], includeAndroidUser []int) (uidRanges []ranges.Range[uint32]) {
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if len(includeRanges) > 0 {
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uidRanges = includeRanges
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}
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if len(includeAndroidUser) > 0 {
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includeAndroidUser = common.Uniq(includeAndroidUser)
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sort.Ints(includeAndroidUser)
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for _, androidUser := range includeAndroidUser {
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uidRanges = append(uidRanges, ranges.New[uint32](uint32(androidUser)*androidUserRange, uint32(androidUser+1)*androidUserRange-1))
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}
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}
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if len(uidRanges) > 0 {
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uidRanges = ranges.Exclude(uidRanges, excludeRanges)
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uidRanges = ranges.Revert(0, userEnd, uidRanges)
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} else {
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uidRanges = excludeRanges
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}
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return ranges.Merge(uidRanges)
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}
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func DefaultInterfaceName() (tunName string) {
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if runtime.GOOS == "darwin" {
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tunName = "utun"
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} else {
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tunName = "tun"
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}
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interfaces, err := net.Interfaces()
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if err != nil {
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return
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}
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var tunIndex int
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for _, netInterface := range interfaces {
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if strings.HasPrefix(netInterface.Name, tunName) {
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index, parseErr := strconv.ParseInt(netInterface.Name[len(tunName):], 10, 16)
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if parseErr == nil {
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tunIndex = int(index) + 1
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}
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}
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}
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tunName = F.ToString(tunName, tunIndex)
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return
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}
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