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// +build !confonly
package router
//go:generate go run v2ray.com/core/common/errors/errorgen
import (
"context"
"v2ray.com/core"
"v2ray.com/core/common"
"v2ray.com/core/features/dns"
"v2ray.com/core/features/outbound"
"v2ray.com/core/features/routing"
routing_dns "v2ray.com/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
}
// Route is an implementation of routing.Route.
type Route struct {
routing.Context
outboundGroupTags []string
outboundTag string
}
// Init initializes the Router.
func (r *Router) Init(config *Config, d dns.Client, ohm outbound.Manager) error {
r.domainStrategy = config.DomainStrategy
r.dns = d
r.balancers = make(map[string]*Balancer, len(config.BalancingRule))
for _, rule := range config.BalancingRule {
balancer, err := rule.Build(ohm)
if err != nil {
return err
}
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(),
}
btag := rule.GetBalancingTag()
if len(btag) > 0 {
brule, found := r.balancers[btag]
if !found {
return newError("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}, nil
}
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 (*Router) Start() error {
return nil
}
// Close implements common.Closable.
func (*Router) Close() error {
return nil
}
// Type implement 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 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) error {
return r.Init(config.(*Config), d, ohm)
}); err != nil {
return nil, err
}
return r, nil
}))
}
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