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tun.go
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tun.go
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package tun
import (
"io"
"net"
"net/netip"
"runtime"
"strconv"
"strings"
F "github.com/sagernet/sing/common/format"
"github.com/sagernet/sing/common/logger"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
"github.com/sagernet/sing/common/ranges"
)
type Handler interface {
PrepareConnection(source M.Socksaddr, destination M.Socksaddr) error
N.TCPConnectionHandlerEx
N.UDPConnectionHandlerEx
}
type Tun interface {
io.ReadWriter
N.VectorisedWriter
Close() error
}
type WinTun interface {
Tun
ReadPacket() ([]byte, func(), error)
}
type LinuxTUN interface {
Tun
N.FrontHeadroom
BatchSize() int
BatchRead(buffers [][]byte, offset int, readN []int) (n int, err error)
BatchWrite(buffers [][]byte, offset int) error
TXChecksumOffload() bool
}
const (
DefaultIPRoute2TableIndex = 2022
DefaultIPRoute2RuleIndex = 9000
)
type Options struct {
Name string
Inet4Address []netip.Prefix
Inet6Address []netip.Prefix
MTU uint32
GSO bool
AutoRoute bool
DNSServers []netip.Addr
IPRoute2TableIndex int
IPRoute2RuleIndex int
AutoRedirectMarkMode bool
AutoRedirectInputMark uint32
AutoRedirectOutputMark uint32
StrictRoute bool
Inet4RouteAddress []netip.Prefix
Inet6RouteAddress []netip.Prefix
Inet4RouteExcludeAddress []netip.Prefix
Inet6RouteExcludeAddress []netip.Prefix
IncludeInterface []string
ExcludeInterface []string
IncludeUID []ranges.Range[uint32]
ExcludeUID []ranges.Range[uint32]
IncludeAndroidUser []int
IncludePackage []string
ExcludePackage []string
InterfaceMonitor DefaultInterfaceMonitor
FileDescriptor int
Logger logger.Logger
// No work for TCP, do not use.
_TXChecksumOffload bool
// For library usages.
EXP_DisableDNSHijack bool
}
func CalculateInterfaceName(name string) (tunName string) {
if runtime.GOOS == "darwin" {
tunName = "utun"
} else if name != "" {
tunName = name
} 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 && int(index) >= tunIndex {
tunIndex = int(index) + 1
}
}
}
tunName = F.ToString(tunName, tunIndex)
return
}