mirror of https://github.com/v2ray/v2ray-core
141 lines
2.9 KiB
Go
141 lines
2.9 KiB
Go
package router
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//go:generate go run $GOPATH/src/v2ray.com/core/tools/generrorgen/main.go -pkg router -path App,Router
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import (
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"context"
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"v2ray.com/core/app"
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"v2ray.com/core/app/dns"
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"v2ray.com/core/app/log"
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"v2ray.com/core/common"
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"v2ray.com/core/common/net"
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"v2ray.com/core/proxy"
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)
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var (
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ErrNoRuleApplicable = newError("No rule applicable")
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)
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type Router struct {
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domainStrategy Config_DomainStrategy
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rules []Rule
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dnsServer dns.Server
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}
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func NewRouter(ctx context.Context, config *Config) (*Router, error) {
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space := app.SpaceFromContext(ctx)
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if space == nil {
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return nil, newError("no space in context")
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}
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r := &Router{
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domainStrategy: config.DomainStrategy,
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rules: make([]Rule, len(config.Rule)),
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}
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space.OnInitialize(func() error {
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for idx, rule := range config.Rule {
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r.rules[idx].Tag = rule.Tag
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cond, err := rule.BuildCondition()
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if err != nil {
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return err
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}
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r.rules[idx].Condition = cond
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}
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r.dnsServer = dns.FromSpace(space)
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if r.dnsServer == nil {
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return newError("DNS is not found in the space")
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}
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return nil
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})
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return r, nil
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}
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type ipResolver struct {
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ip []net.Address
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domain string
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resolved bool
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dnsServer dns.Server
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}
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func (r *ipResolver) Resolve() []net.Address {
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if r.resolved {
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return r.ip
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}
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log.Trace(newError("looking for IP for domain: ", r.domain))
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r.resolved = true
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ips := r.dnsServer.Get(r.domain)
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if len(ips) == 0 {
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return nil
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}
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r.ip = make([]net.Address, len(ips))
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for i, ip := range ips {
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r.ip[i] = net.IPAddress(ip)
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}
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return r.ip
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}
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func (r *Router) TakeDetour(ctx context.Context) (string, error) {
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resolver := &ipResolver{
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dnsServer: r.dnsServer,
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}
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if r.domainStrategy == Config_IpOnDemand {
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if dest, ok := proxy.TargetFromContext(ctx); ok && dest.Address.Family().IsDomain() {
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resolver.domain = dest.Address.Domain()
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ctx = proxy.ContextWithResolveIPs(ctx, resolver)
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}
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}
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for _, rule := range r.rules {
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if rule.Apply(ctx) {
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return rule.Tag, nil
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}
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}
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dest, ok := proxy.TargetFromContext(ctx)
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if !ok {
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return "", ErrNoRuleApplicable
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}
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if r.domainStrategy == Config_IpIfNonMatch && dest.Address.Family().IsDomain() {
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resolver.domain = dest.Address.Domain()
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ips := resolver.Resolve()
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if len(ips) > 0 {
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ctx = proxy.ContextWithResolveIPs(ctx, resolver)
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for _, rule := range r.rules {
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if rule.Apply(ctx) {
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return rule.Tag, nil
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}
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}
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}
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}
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return "", ErrNoRuleApplicable
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}
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func (*Router) Interface() interface{} {
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return (*Router)(nil)
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}
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func (*Router) Start() error {
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return nil
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}
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func (*Router) Close() {}
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func FromSpace(space app.Space) *Router {
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app := space.GetApplication((*Router)(nil))
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if app == nil {
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return nil
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}
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return app.(*Router)
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}
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func init() {
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common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return NewRouter(ctx, config.(*Config))
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}))
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}
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