mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-24 01:21:30 +00:00
325 lines
9 KiB
Go
325 lines
9 KiB
Go
package rule
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import (
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"context"
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"net/netip"
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"strings"
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"sync"
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"syscall"
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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/dialer"
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"github.com/sagernet/sing-box/common/sniff"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing-dns"
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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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F "github.com/sagernet/sing/common/format"
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"github.com/sagernet/sing/common/logger"
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N "github.com/sagernet/sing/common/network"
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)
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func NewRuleAction(router adapter.Router, logger logger.ContextLogger, action option.RuleAction) (adapter.RuleAction, error) {
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switch action.Action {
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case "":
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return nil, nil
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case C.RuleActionTypeRoute:
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return &RuleActionRoute{
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Outbound: action.RouteOptions.Outbound,
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}, nil
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case C.RuleActionTypeRouteOptions:
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return &RuleActionRouteOptions{
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UDPDisableDomainUnmapping: action.RouteOptionsOptions.UDPDisableDomainUnmapping,
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UDPConnect: action.RouteOptionsOptions.UDPConnect,
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}, nil
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case C.RuleActionTypeDirect:
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directDialer, err := dialer.New(router, option.DialerOptions(action.DirectOptions))
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if err != nil {
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return nil, err
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}
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var description string
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descriptions := action.DirectOptions.Descriptions()
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switch len(descriptions) {
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case 0:
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case 1:
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description = F.ToString("(", descriptions[0], ")")
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case 2:
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description = F.ToString("(", descriptions[0], ",", descriptions[1], ")")
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default:
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description = F.ToString("(", descriptions[0], ",", descriptions[1], ",...)")
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}
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return &RuleActionDirect{
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Dialer: directDialer,
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description: description,
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}, nil
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case C.RuleActionTypeReject:
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return &RuleActionReject{
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Method: action.RejectOptions.Method,
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NoDrop: action.RejectOptions.NoDrop,
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logger: logger,
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}, nil
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case C.RuleActionTypeHijackDNS:
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return &RuleActionHijackDNS{}, nil
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case C.RuleActionTypeSniff:
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sniffAction := &RuleActionSniff{
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snifferNames: action.SniffOptions.Sniffer,
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Timeout: time.Duration(action.SniffOptions.Timeout),
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}
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return sniffAction, sniffAction.build()
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case C.RuleActionTypeResolve:
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return &RuleActionResolve{
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Strategy: dns.DomainStrategy(action.ResolveOptions.Strategy),
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Server: action.ResolveOptions.Server,
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}, nil
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default:
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panic(F.ToString("unknown rule action: ", action.Action))
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}
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}
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func NewDNSRuleAction(logger logger.ContextLogger, action option.DNSRuleAction) adapter.RuleAction {
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switch action.Action {
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case "":
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return nil
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case C.RuleActionTypeRoute:
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return &RuleActionDNSRoute{
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Server: action.RouteOptions.Server,
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DisableCache: action.RouteOptions.DisableCache,
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RewriteTTL: action.RouteOptions.RewriteTTL,
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ClientSubnet: netip.Prefix(common.PtrValueOrDefault(action.RouteOptions.ClientSubnet)),
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}
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case C.RuleActionTypeRouteOptions:
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return &RuleActionDNSRouteOptions{
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DisableCache: action.RouteOptionsOptions.DisableCache,
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RewriteTTL: action.RouteOptionsOptions.RewriteTTL,
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ClientSubnet: netip.Prefix(common.PtrValueOrDefault(action.RouteOptionsOptions.ClientSubnet)),
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}
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case C.RuleActionTypeReject:
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return &RuleActionReject{
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Method: action.RejectOptions.Method,
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NoDrop: action.RejectOptions.NoDrop,
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logger: logger,
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}
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default:
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panic(F.ToString("unknown rule action: ", action.Action))
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}
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}
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type RuleActionRoute struct {
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Outbound string
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}
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func (r *RuleActionRoute) Type() string {
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return C.RuleActionTypeRoute
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}
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func (r *RuleActionRoute) String() string {
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return F.ToString("route(", r.Outbound, ")")
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}
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type RuleActionRouteOptions struct {
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UDPDisableDomainUnmapping bool
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UDPConnect bool
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}
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func (r *RuleActionRouteOptions) Type() string {
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return C.RuleActionTypeRouteOptions
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}
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func (r *RuleActionRouteOptions) String() string {
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var descriptions []string
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if r.UDPDisableDomainUnmapping {
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descriptions = append(descriptions, "udp-disable-domain-unmapping")
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}
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if r.UDPConnect {
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descriptions = append(descriptions, "udp-connect")
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}
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return F.ToString("route-options(", strings.Join(descriptions, ","), ")")
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}
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type RuleActionDNSRoute struct {
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Server string
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DisableCache bool
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RewriteTTL *uint32
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ClientSubnet netip.Prefix
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}
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func (r *RuleActionDNSRoute) Type() string {
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return C.RuleActionTypeRoute
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}
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func (r *RuleActionDNSRoute) String() string {
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return F.ToString("route(", r.Server, ")")
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}
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type RuleActionDNSRouteOptions struct {
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DisableCache bool
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RewriteTTL *uint32
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ClientSubnet netip.Prefix
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}
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func (r *RuleActionDNSRouteOptions) Type() string {
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return C.RuleActionTypeRouteOptions
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}
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func (r *RuleActionDNSRouteOptions) String() string {
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var descriptions []string
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if r.DisableCache {
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descriptions = append(descriptions, "disable-cache")
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}
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if r.RewriteTTL != nil {
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descriptions = append(descriptions, F.ToString("rewrite-ttl(", *r.RewriteTTL, ")"))
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}
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if r.ClientSubnet.IsValid() {
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descriptions = append(descriptions, F.ToString("client-subnet(", r.ClientSubnet, ")"))
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}
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return F.ToString("route-options(", strings.Join(descriptions, ","), ")")
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}
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type RuleActionDirect struct {
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Dialer N.Dialer
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description string
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}
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func (r *RuleActionDirect) Type() string {
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return C.RuleActionTypeDirect
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}
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func (r *RuleActionDirect) String() string {
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return "direct" + r.description
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}
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type RuleActionReject struct {
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Method string
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NoDrop bool
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logger logger.ContextLogger
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dropAccess sync.Mutex
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dropCounter []time.Time
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}
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func (r *RuleActionReject) Type() string {
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return C.RuleActionTypeReject
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}
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func (r *RuleActionReject) String() string {
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if r.Method == C.RuleActionRejectMethodDefault {
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return "reject"
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}
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return F.ToString("reject(", r.Method, ")")
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}
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func (r *RuleActionReject) Error(ctx context.Context) error {
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var returnErr error
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switch r.Method {
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case C.RuleActionRejectMethodDefault:
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returnErr = syscall.ECONNREFUSED
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case C.RuleActionRejectMethodDrop:
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return tun.ErrDrop
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default:
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panic(F.ToString("unknown reject method: ", r.Method))
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}
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r.dropAccess.Lock()
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defer r.dropAccess.Unlock()
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timeNow := time.Now()
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r.dropCounter = common.Filter(r.dropCounter, func(t time.Time) bool {
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return timeNow.Sub(t) <= 30*time.Second
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})
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r.dropCounter = append(r.dropCounter, timeNow)
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if len(r.dropCounter) > 50 {
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if ctx != nil {
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r.logger.DebugContext(ctx, "dropped due to flooding")
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}
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return tun.ErrDrop
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}
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return returnErr
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}
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type RuleActionHijackDNS struct{}
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func (r *RuleActionHijackDNS) Type() string {
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return C.RuleActionTypeHijackDNS
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}
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func (r *RuleActionHijackDNS) String() string {
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return "hijack-dns"
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}
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type RuleActionSniff struct {
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snifferNames []string
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StreamSniffers []sniff.StreamSniffer
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PacketSniffers []sniff.PacketSniffer
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Timeout time.Duration
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// Deprecated
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OverrideDestination bool
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}
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func (r *RuleActionSniff) Type() string {
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return C.RuleActionTypeSniff
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}
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func (r *RuleActionSniff) build() error {
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for _, name := range r.snifferNames {
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switch name {
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case C.ProtocolTLS:
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r.StreamSniffers = append(r.StreamSniffers, sniff.TLSClientHello)
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case C.ProtocolHTTP:
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r.StreamSniffers = append(r.StreamSniffers, sniff.HTTPHost)
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case C.ProtocolQUIC:
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r.PacketSniffers = append(r.PacketSniffers, sniff.QUICClientHello)
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case C.ProtocolDNS:
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r.StreamSniffers = append(r.StreamSniffers, sniff.StreamDomainNameQuery)
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r.PacketSniffers = append(r.PacketSniffers, sniff.DomainNameQuery)
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case C.ProtocolSTUN:
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r.PacketSniffers = append(r.PacketSniffers, sniff.STUNMessage)
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case C.ProtocolBitTorrent:
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r.StreamSniffers = append(r.StreamSniffers, sniff.BitTorrent)
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r.PacketSniffers = append(r.PacketSniffers, sniff.UTP)
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r.PacketSniffers = append(r.PacketSniffers, sniff.UDPTracker)
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case C.ProtocolDTLS:
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r.PacketSniffers = append(r.PacketSniffers, sniff.DTLSRecord)
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case C.ProtocolSSH:
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r.StreamSniffers = append(r.StreamSniffers, sniff.SSH)
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case C.ProtocolRDP:
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r.StreamSniffers = append(r.StreamSniffers, sniff.RDP)
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default:
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return E.New("unknown sniffer: ", name)
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}
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}
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return nil
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}
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func (r *RuleActionSniff) String() string {
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if len(r.snifferNames) == 0 && r.Timeout == 0 {
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return "sniff"
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} else if len(r.snifferNames) > 0 && r.Timeout == 0 {
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return F.ToString("sniff(", strings.Join(r.snifferNames, ","), ")")
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} else if len(r.snifferNames) == 0 && r.Timeout > 0 {
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return F.ToString("sniff(", r.Timeout.String(), ")")
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} else {
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return F.ToString("sniff(", strings.Join(r.snifferNames, ","), ",", r.Timeout.String(), ")")
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}
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}
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type RuleActionResolve struct {
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Strategy dns.DomainStrategy
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Server string
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}
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func (r *RuleActionResolve) Type() string {
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return C.RuleActionTypeResolve
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}
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func (r *RuleActionResolve) String() string {
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if r.Strategy == dns.DomainStrategyAsIS && r.Server == "" {
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return F.ToString("resolve")
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} else if r.Strategy != dns.DomainStrategyAsIS && r.Server == "" {
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return F.ToString("resolve(", option.DomainStrategy(r.Strategy).String(), ")")
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} else if r.Strategy == dns.DomainStrategyAsIS && r.Server != "" {
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return F.ToString("resolve(", r.Server, ")")
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} else {
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return F.ToString("resolve(", option.DomainStrategy(r.Strategy).String(), ",", r.Server, ")")
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}
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}
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