mirror of https://github.com/v2fly/v2ray-core.git
136 lines
2.9 KiB
Go
136 lines
2.9 KiB
Go
package router
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//go:generate errorgen
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import (
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"context"
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"v2ray.com/core"
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"v2ray.com/core/common"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/session"
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"v2ray.com/core/features/dns"
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"v2ray.com/core/features/routing"
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"v2ray.com/core/proxy"
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)
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// Router is an implementation of routing.Router.
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type Router struct {
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domainStrategy Config_DomainStrategy
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rules []Rule
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dns dns.Client
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}
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// NewRouter creates a new Router based on the given config.
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func NewRouter(ctx context.Context, config *Config) (*Router, error) {
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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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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 nil, err
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}
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r.rules[idx].Condition = cond
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}
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core.RequireFeatures(ctx, func(d dns.Client) {
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r.dns = d
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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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dns dns.Client
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ip []net.Address
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domain string
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resolved bool
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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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newError("looking for IP for domain: ", r.domain).WriteToLog()
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r.resolved = true
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ips, err := r.dns.LookupIP(r.domain)
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if err != nil {
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newError("failed to get IP address").Base(err).WriteToLog()
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}
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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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// PickRoute implements routing.Router.
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func (r *Router) PickRoute(ctx context.Context) (string, error) {
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resolver := &ipResolver{
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dns: r.dns,
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}
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outbound := session.OutboundFromContext(ctx)
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if r.domainStrategy == Config_IpOnDemand {
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if outbound != nil && outbound.Target.IsValid() && outbound.Target.Address.Family().IsDomain() {
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resolver.domain = outbound.Target.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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if outbound == nil || !outbound.Target.IsValid() {
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return "", common.ErrNoClue
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}
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dest := outbound.Target
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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 "", common.ErrNoClue
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}
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// Start implements common.Runnable.
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func (*Router) Start() error {
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return nil
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}
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// Close implements common.Closable.
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func (*Router) Close() error {
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return nil
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}
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// Type implement common.HasType.
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func (*Router) Type() interface{} {
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return routing.RouterType()
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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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