mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-09-19 10:07:52 +00:00
436 lines
14 KiB
Go
436 lines
14 KiB
Go
package inbound
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import (
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"context"
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"net"
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"net/netip"
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"os"
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"runtime"
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"strconv"
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"strings"
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"time"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/common/taskmonitor"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/experimental/libbox/platform"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing-tun"
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"github.com/sagernet/sing/common"
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E "github.com/sagernet/sing/common/exceptions"
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M "github.com/sagernet/sing/common/metadata"
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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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"github.com/sagernet/sing/common/x/list"
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"go4.org/netipx"
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)
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var _ adapter.Inbound = (*Tun)(nil)
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type Tun struct {
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tag string
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ctx context.Context
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router adapter.Router
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logger log.ContextLogger
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inboundOptions option.InboundOptions
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tunOptions tun.Options
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endpointIndependentNat bool
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udpTimeout int64
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stack string
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tunIf tun.Tun
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tunStack tun.Stack
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platformInterface platform.Interface
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platformOptions option.TunPlatformOptions
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autoRedirect tun.AutoRedirect
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routeRuleSet []adapter.RuleSet
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routeRuleSetCallback []*list.Element[adapter.RuleSetUpdateCallback]
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routeExcludeRuleSet []adapter.RuleSet
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routeExcludeRuleSetCallback []*list.Element[adapter.RuleSetUpdateCallback]
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routeAddressSet []*netipx.IPSet
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routeExcludeAddressSet []*netipx.IPSet
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}
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func NewTun(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.TunInboundOptions, platformInterface platform.Interface) (*Tun, error) {
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address := options.Address
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//nolint:staticcheck
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//goland:noinspection GoDeprecation
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if len(options.Inet4Address) > 0 {
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address = append(address, options.Inet4Address...)
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}
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//nolint:staticcheck
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//goland:noinspection GoDeprecation
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if len(options.Inet6Address) > 0 {
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address = append(address, options.Inet6Address...)
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}
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inet4Address := common.Filter(address, func(it netip.Prefix) bool {
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return it.Addr().Is4()
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})
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inet6Address := common.Filter(address, func(it netip.Prefix) bool {
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return it.Addr().Is6()
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})
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routeAddress := options.RouteAddress
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//nolint:staticcheck
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//goland:noinspection GoDeprecation
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if len(options.Inet4RouteAddress) > 0 {
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routeAddress = append(routeAddress, options.Inet4RouteAddress...)
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}
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//nolint:staticcheck
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//goland:noinspection GoDeprecation
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if len(options.Inet6RouteAddress) > 0 {
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routeAddress = append(routeAddress, options.Inet6RouteAddress...)
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}
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inet4RouteAddress := common.Filter(routeAddress, func(it netip.Prefix) bool {
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return it.Addr().Is4()
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})
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inet6RouteAddress := common.Filter(routeAddress, func(it netip.Prefix) bool {
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return it.Addr().Is6()
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})
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routeExcludeAddress := options.RouteExcludeAddress
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//nolint:staticcheck
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//goland:noinspection GoDeprecation
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if len(options.Inet4RouteExcludeAddress) > 0 {
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routeExcludeAddress = append(routeExcludeAddress, options.Inet4RouteExcludeAddress...)
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}
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//nolint:staticcheck
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//goland:noinspection GoDeprecation
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if len(options.Inet6RouteExcludeAddress) > 0 {
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routeExcludeAddress = append(routeExcludeAddress, options.Inet6RouteExcludeAddress...)
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}
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inet4RouteExcludeAddress := common.Filter(routeExcludeAddress, func(it netip.Prefix) bool {
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return it.Addr().Is4()
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})
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inet6RouteExcludeAddress := common.Filter(routeExcludeAddress, func(it netip.Prefix) bool {
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return it.Addr().Is6()
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})
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tunMTU := options.MTU
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if tunMTU == 0 {
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tunMTU = 9000
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}
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var udpTimeout time.Duration
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if options.UDPTimeout != 0 {
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udpTimeout = time.Duration(options.UDPTimeout)
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} else {
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udpTimeout = C.UDPTimeout
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}
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var err error
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includeUID := uidToRange(options.IncludeUID)
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if len(options.IncludeUIDRange) > 0 {
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includeUID, err = parseRange(includeUID, options.IncludeUIDRange)
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if err != nil {
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return nil, E.Cause(err, "parse include_uid_range")
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}
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}
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excludeUID := uidToRange(options.ExcludeUID)
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if len(options.ExcludeUIDRange) > 0 {
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excludeUID, err = parseRange(excludeUID, options.ExcludeUIDRange)
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if err != nil {
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return nil, E.Cause(err, "parse exclude_uid_range")
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}
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}
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tableIndex := options.IPRoute2TableIndex
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if tableIndex == 0 {
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tableIndex = tun.DefaultIPRoute2TableIndex
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}
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ruleIndex := options.IPRoute2RuleIndex
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if ruleIndex == 0 {
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ruleIndex = tun.DefaultIPRoute2RuleIndex
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}
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inputMark := uint32(options.AutoRedirectInputMark)
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if inputMark == 0 {
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inputMark = tun.DefaultAutoRedirectInputMark
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}
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outputMark := uint32(options.AutoRedirectOutputMark)
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if outputMark == 0 {
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outputMark = tun.DefaultAutoRedirectOutputMark
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}
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inbound := &Tun{
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tag: tag,
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ctx: ctx,
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router: router,
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logger: logger,
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inboundOptions: options.InboundOptions,
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tunOptions: tun.Options{
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Name: options.InterfaceName,
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MTU: tunMTU,
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GSO: options.GSO,
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Inet4Address: inet4Address,
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Inet6Address: inet6Address,
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AutoRoute: options.AutoRoute,
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IPRoute2TableIndex: tableIndex,
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IPRoute2RuleIndex: ruleIndex,
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AutoRedirectInputMark: inputMark,
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AutoRedirectOutputMark: outputMark,
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StrictRoute: options.StrictRoute,
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IncludeInterface: options.IncludeInterface,
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ExcludeInterface: options.ExcludeInterface,
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Inet4RouteAddress: inet4RouteAddress,
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Inet6RouteAddress: inet6RouteAddress,
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Inet4RouteExcludeAddress: inet4RouteExcludeAddress,
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Inet6RouteExcludeAddress: inet6RouteExcludeAddress,
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IncludeUID: includeUID,
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ExcludeUID: excludeUID,
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IncludeAndroidUser: options.IncludeAndroidUser,
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IncludePackage: options.IncludePackage,
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ExcludePackage: options.ExcludePackage,
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InterfaceMonitor: router.InterfaceMonitor(),
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},
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endpointIndependentNat: options.EndpointIndependentNat,
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udpTimeout: int64(udpTimeout.Seconds()),
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stack: options.Stack,
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platformInterface: platformInterface,
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platformOptions: common.PtrValueOrDefault(options.Platform),
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}
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if options.AutoRedirect {
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if !options.AutoRoute {
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return nil, E.New("`auto_route` is required by `auto_redirect`")
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}
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disableNFTables, dErr := strconv.ParseBool(os.Getenv("DISABLE_NFTABLES"))
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inbound.autoRedirect, err = tun.NewAutoRedirect(tun.AutoRedirectOptions{
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TunOptions: &inbound.tunOptions,
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Context: ctx,
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Handler: inbound,
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Logger: logger,
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NetworkMonitor: router.NetworkMonitor(),
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InterfaceFinder: router.InterfaceFinder(),
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TableName: "sing-box",
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DisableNFTables: dErr == nil && disableNFTables,
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RouteAddressSet: &inbound.routeAddressSet,
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RouteExcludeAddressSet: &inbound.routeExcludeAddressSet,
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})
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if err != nil {
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return nil, E.Cause(err, "initialize auto-redirect")
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}
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if runtime.GOOS != "android" {
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var markMode bool
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for _, routeAddressSet := range options.RouteAddressSet {
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ruleSet, loaded := router.RuleSet(routeAddressSet)
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if !loaded {
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return nil, E.New("parse route_address_set: rule-set not found: ", routeAddressSet)
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}
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ruleSet.IncRef()
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inbound.routeRuleSet = append(inbound.routeRuleSet, ruleSet)
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markMode = true
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}
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for _, routeExcludeAddressSet := range options.RouteExcludeAddressSet {
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ruleSet, loaded := router.RuleSet(routeExcludeAddressSet)
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if !loaded {
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return nil, E.New("parse route_exclude_address_set: rule-set not found: ", routeExcludeAddressSet)
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}
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ruleSet.IncRef()
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inbound.routeExcludeRuleSet = append(inbound.routeExcludeRuleSet, ruleSet)
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markMode = true
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}
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if markMode {
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inbound.tunOptions.AutoRedirectMarkMode = true
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err = router.RegisterAutoRedirectOutputMark(inbound.tunOptions.AutoRedirectOutputMark)
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if err != nil {
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return nil, err
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}
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}
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}
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}
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return inbound, nil
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}
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func uidToRange(uidList option.Listable[uint32]) []ranges.Range[uint32] {
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return common.Map(uidList, func(uid uint32) ranges.Range[uint32] {
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return ranges.NewSingle(uid)
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})
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}
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func parseRange(uidRanges []ranges.Range[uint32], rangeList []string) ([]ranges.Range[uint32], error) {
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for _, uidRange := range rangeList {
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if !strings.Contains(uidRange, ":") {
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return nil, E.New("missing ':' in range: ", uidRange)
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}
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subIndex := strings.Index(uidRange, ":")
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if subIndex == 0 {
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return nil, E.New("missing range start: ", uidRange)
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} else if subIndex == len(uidRange)-1 {
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return nil, E.New("missing range end: ", uidRange)
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}
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var start, end uint64
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var err error
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start, err = strconv.ParseUint(uidRange[:subIndex], 0, 32)
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if err != nil {
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return nil, E.Cause(err, "parse range start")
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}
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end, err = strconv.ParseUint(uidRange[subIndex+1:], 0, 32)
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if err != nil {
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return nil, E.Cause(err, "parse range end")
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}
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uidRanges = append(uidRanges, ranges.New(uint32(start), uint32(end)))
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}
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return uidRanges, nil
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}
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func (t *Tun) Type() string {
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return C.TypeTun
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}
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func (t *Tun) Tag() string {
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return t.tag
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}
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func (t *Tun) Start() error {
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if C.IsAndroid && t.platformInterface == nil {
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t.tunOptions.BuildAndroidRules(t.router.PackageManager(), t)
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}
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if t.tunOptions.Name == "" {
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t.tunOptions.Name = tun.CalculateInterfaceName("")
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}
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var (
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tunInterface tun.Tun
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err error
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)
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monitor := taskmonitor.New(t.logger, C.StartTimeout)
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monitor.Start("open tun interface")
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if t.platformInterface != nil {
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tunInterface, err = t.platformInterface.OpenTun(&t.tunOptions, t.platformOptions)
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} else {
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tunInterface, err = tun.New(t.tunOptions)
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}
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monitor.Finish()
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if err != nil {
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return E.Cause(err, "configure tun interface")
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}
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t.logger.Trace("creating stack")
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t.tunIf = tunInterface
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var (
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forwarderBindInterface bool
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includeAllNetworks bool
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)
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if t.platformInterface != nil {
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forwarderBindInterface = true
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includeAllNetworks = t.platformInterface.IncludeAllNetworks()
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}
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tunStack, err := tun.NewStack(t.stack, tun.StackOptions{
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Context: t.ctx,
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Tun: tunInterface,
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TunOptions: t.tunOptions,
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EndpointIndependentNat: t.endpointIndependentNat,
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UDPTimeout: t.udpTimeout,
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Handler: t,
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Logger: t.logger,
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ForwarderBindInterface: forwarderBindInterface,
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InterfaceFinder: t.router.InterfaceFinder(),
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IncludeAllNetworks: includeAllNetworks,
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})
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if err != nil {
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return err
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}
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monitor.Start("initiating tun stack")
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err = tunStack.Start()
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monitor.Finish()
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t.tunStack = tunStack
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if err != nil {
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return err
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}
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t.logger.Info("started at ", t.tunOptions.Name)
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return nil
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}
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func (t *Tun) PostStart() error {
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monitor := taskmonitor.New(t.logger, C.StartTimeout)
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if t.autoRedirect != nil {
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t.routeAddressSet = common.FlatMap(t.routeRuleSet, adapter.RuleSet.ExtractIPSet)
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for _, routeRuleSet := range t.routeRuleSet {
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ipSets := routeRuleSet.ExtractIPSet()
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if len(ipSets) == 0 {
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t.logger.Warn("route_address_set: no destination IP CIDR rules found in rule-set: ", routeRuleSet.Name())
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}
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t.routeAddressSet = append(t.routeAddressSet, ipSets...)
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}
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t.routeExcludeAddressSet = common.FlatMap(t.routeExcludeRuleSet, adapter.RuleSet.ExtractIPSet)
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for _, routeExcludeRuleSet := range t.routeExcludeRuleSet {
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ipSets := routeExcludeRuleSet.ExtractIPSet()
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if len(ipSets) == 0 {
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t.logger.Warn("route_address_set: no destination IP CIDR rules found in rule-set: ", routeExcludeRuleSet.Name())
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}
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t.routeExcludeAddressSet = append(t.routeExcludeAddressSet, ipSets...)
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}
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monitor.Start("initialize auto-redirect")
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err := t.autoRedirect.Start()
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monitor.Finish()
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if err != nil {
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return E.Cause(err, "auto-redirect")
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}
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for _, routeRuleSet := range t.routeRuleSet {
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t.routeRuleSetCallback = append(t.routeRuleSetCallback, routeRuleSet.RegisterCallback(t.updateRouteAddressSet))
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routeRuleSet.DecRef()
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}
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for _, routeExcludeRuleSet := range t.routeExcludeRuleSet {
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t.routeExcludeRuleSetCallback = append(t.routeExcludeRuleSetCallback, routeExcludeRuleSet.RegisterCallback(t.updateRouteAddressSet))
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routeExcludeRuleSet.DecRef()
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}
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t.routeAddressSet = nil
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t.routeExcludeAddressSet = nil
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}
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return nil
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}
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func (t *Tun) updateRouteAddressSet(it adapter.RuleSet) {
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t.routeAddressSet = common.FlatMap(t.routeRuleSet, adapter.RuleSet.ExtractIPSet)
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t.routeExcludeAddressSet = common.FlatMap(t.routeExcludeRuleSet, adapter.RuleSet.ExtractIPSet)
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t.autoRedirect.UpdateRouteAddressSet()
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t.routeAddressSet = nil
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t.routeExcludeAddressSet = nil
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}
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func (t *Tun) Close() error {
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return common.Close(
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t.tunStack,
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t.tunIf,
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t.autoRedirect,
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)
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}
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func (t *Tun) NewConnection(ctx context.Context, conn net.Conn, upstreamMetadata M.Metadata) error {
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ctx = log.ContextWithNewID(ctx)
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var metadata adapter.InboundContext
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metadata.Inbound = t.tag
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metadata.InboundType = C.TypeTun
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metadata.Source = upstreamMetadata.Source
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metadata.Destination = upstreamMetadata.Destination
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metadata.InboundOptions = t.inboundOptions
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if upstreamMetadata.Protocol != "" {
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t.logger.InfoContext(ctx, "inbound ", upstreamMetadata.Protocol, " connection from ", metadata.Source)
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} else {
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t.logger.InfoContext(ctx, "inbound connection from ", metadata.Source)
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}
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t.logger.InfoContext(ctx, "inbound connection to ", metadata.Destination)
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err := t.router.RouteConnection(ctx, conn, metadata)
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if err != nil {
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t.NewError(ctx, err)
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}
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return nil
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}
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func (t *Tun) NewPacketConnection(ctx context.Context, conn N.PacketConn, upstreamMetadata M.Metadata) error {
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ctx = log.ContextWithNewID(ctx)
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var metadata adapter.InboundContext
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metadata.Inbound = t.tag
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metadata.InboundType = C.TypeTun
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metadata.Source = upstreamMetadata.Source
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metadata.Destination = upstreamMetadata.Destination
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metadata.InboundOptions = t.inboundOptions
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t.logger.InfoContext(ctx, "inbound packet connection from ", metadata.Source)
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t.logger.InfoContext(ctx, "inbound packet connection to ", metadata.Destination)
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err := t.router.RoutePacketConnection(ctx, conn, metadata)
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if err != nil {
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t.NewError(ctx, err)
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}
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return nil
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}
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func (t *Tun) NewError(ctx context.Context, err error) {
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NewError(t.logger, ctx, err)
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}
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