Xray-core/app/router/router.go
2024-09-13 13:05:19 -04:00

258 lines
5.9 KiB
Go

package router
//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
import (
"context"
sync "sync"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/serial"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/dns"
"github.com/xtls/xray-core/features/outbound"
"github.com/xtls/xray-core/features/routing"
routing_dns "github.com/xtls/xray-core/features/routing/dns"
)
// Router is an implementation of routing.Router.
type Router struct {
domainStrategy Config_DomainStrategy
rules []*Rule
balancers map[string]*Balancer
dns dns.Client
ctx context.Context
ohm outbound.Manager
dispatcher routing.Dispatcher
mu sync.Mutex
}
// Route is an implementation of routing.Route.
type Route struct {
routing.Context
outboundGroupTags []string
outboundTag string
ruleTag string
}
// Init initializes the Router.
func (r *Router) Init(ctx context.Context, config *Config, d dns.Client, ohm outbound.Manager, dispatcher routing.Dispatcher) error {
r.domainStrategy = config.DomainStrategy
r.dns = d
r.ctx = ctx
r.ohm = ohm
r.dispatcher = dispatcher
r.balancers = make(map[string]*Balancer, len(config.BalancingRule))
for _, rule := range config.BalancingRule {
balancer, err := rule.Build(ohm, dispatcher)
if err != nil {
return err
}
balancer.InjectContext(ctx)
r.balancers[rule.Tag] = balancer
}
r.rules = make([]*Rule, 0, len(config.Rule))
for _, rule := range config.Rule {
cond, err := rule.BuildCondition()
if err != nil {
return err
}
rr := &Rule{
Condition: cond,
Tag: rule.GetTag(),
RuleTag: rule.GetRuleTag(),
}
btag := rule.GetBalancingTag()
if len(btag) > 0 {
brule, found := r.balancers[btag]
if !found {
return errors.New("balancer ", btag, " not found")
}
rr.Balancer = brule
}
r.rules = append(r.rules, rr)
}
return nil
}
// PickRoute implements routing.Router.
func (r *Router) PickRoute(ctx routing.Context) (routing.Route, error) {
rule, ctx, err := r.pickRouteInternal(ctx)
if err != nil {
return nil, err
}
tag, err := rule.GetTag()
if err != nil {
return nil, err
}
return &Route{Context: ctx, outboundTag: tag, ruleTag: rule.RuleTag}, nil
}
// AddRule implements routing.Router.
func (r *Router) AddRule(config *serial.TypedMessage, shouldAppend bool) error {
inst, err := config.GetInstance()
if err != nil {
return err
}
if c, ok := inst.(*Config); ok {
return r.ReloadRules(c, shouldAppend)
}
return errors.New("AddRule: config type error")
}
func (r *Router) ReloadRules(config *Config, shouldAppend bool) error {
r.mu.Lock()
defer r.mu.Unlock()
if !shouldAppend {
r.balancers = make(map[string]*Balancer, len(config.BalancingRule))
r.rules = make([]*Rule, 0, len(config.Rule))
}
for _, rule := range config.BalancingRule {
_, found := r.balancers[rule.Tag]
if found {
return errors.New("duplicate balancer tag")
}
balancer, err := rule.Build(r.ohm, r.dispatcher)
if err != nil {
return err
}
balancer.InjectContext(r.ctx)
r.balancers[rule.Tag] = balancer
}
for _, rule := range config.Rule {
if r.RuleExists(rule.GetRuleTag()) {
return errors.New("duplicate ruleTag ", rule.GetRuleTag())
}
cond, err := rule.BuildCondition()
if err != nil {
return err
}
rr := &Rule{
Condition: cond,
Tag: rule.GetTag(),
RuleTag: rule.GetRuleTag(),
}
btag := rule.GetBalancingTag()
if len(btag) > 0 {
brule, found := r.balancers[btag]
if !found {
return errors.New("balancer ", btag, " not found")
}
rr.Balancer = brule
}
r.rules = append(r.rules, rr)
}
return nil
}
func (r *Router) RuleExists(tag string) bool {
if tag != "" {
for _, rule := range r.rules {
if rule.RuleTag == tag {
return true
}
}
}
return false
}
// RemoveRule implements routing.Router.
func (r *Router) RemoveRule(tag string) error {
r.mu.Lock()
defer r.mu.Unlock()
newRules := []*Rule{}
if tag != "" {
for _, rule := range r.rules {
if rule.RuleTag != tag {
newRules = append(newRules, rule)
}
}
r.rules = newRules
return nil
}
return errors.New("empty tag name!")
}
func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context, error) {
// SkipDNSResolve is set from DNS module.
// the DOH remote server maybe a domain name,
// this prevents cycle resolving dead loop
skipDNSResolve := ctx.GetSkipDNSResolve()
if r.domainStrategy == Config_IpOnDemand && !skipDNSResolve {
ctx = routing_dns.ContextWithDNSClient(ctx, r.dns)
}
for _, rule := range r.rules {
if rule.Apply(ctx) {
return rule, ctx, nil
}
}
if r.domainStrategy != Config_IpIfNonMatch || len(ctx.GetTargetDomain()) == 0 || skipDNSResolve {
return nil, ctx, common.ErrNoClue
}
ctx = routing_dns.ContextWithDNSClient(ctx, r.dns)
// Try applying rules again if we have IPs.
for _, rule := range r.rules {
if rule.Apply(ctx) {
return rule, ctx, nil
}
}
return nil, ctx, common.ErrNoClue
}
// Start implements common.Runnable.
func (r *Router) Start() error {
return nil
}
// Close implements common.Closable.
func (r *Router) Close() error {
return nil
}
// Type implements common.HasType.
func (*Router) Type() interface{} {
return routing.RouterType()
}
// GetOutboundGroupTags implements routing.Route.
func (r *Route) GetOutboundGroupTags() []string {
return r.outboundGroupTags
}
// GetOutboundTag implements routing.Route.
func (r *Route) GetOutboundTag() string {
return r.outboundTag
}
func (r *Route) GetRuleTag() string {
return r.ruleTag
}
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
r := new(Router)
if err := core.RequireFeatures(ctx, func(d dns.Client, ohm outbound.Manager, dispatcher routing.Dispatcher) error {
return r.Init(ctx, config.(*Config), d, ohm, dispatcher)
}); err != nil {
return nil, err
}
return r, nil
}))
}