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v2fly/app/router/router.go

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package router
import (
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"errors"
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"v2ray.com/core/app"
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"v2ray.com/core/app/dns"
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"v2ray.com/core/common/log"
v2net "v2ray.com/core/common/net"
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)
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const (
APP_ID = app.ID(3)
)
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var (
ErrInvalidRule = errors.New("Invalid Rule")
ErrNoRuleApplicable = errors.New("No rule applicable")
)
type Router struct {
domainStrategy Config_DomainStrategy
rules []Rule
cache *RoutingTable
dnsServer dns.Server
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}
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func NewRouter(config *Config, space app.Space) *Router {
r := &Router{
domainStrategy: config.DomainStrategy,
cache: NewRoutingTable(),
rules: make([]Rule, len(config.Rule)),
}
space.InitializeApplication(func() error {
for idx, rule := range config.Rule {
r.rules[idx].Tag = rule.Tag
cond, err := rule.BuildCondition()
if err != nil {
return err
}
r.rules[idx].Condition = cond
}
if !space.HasApp(dns.APP_ID) {
log.Error("DNS: Router is not found in the space.")
return app.ErrMissingApplication
}
r.dnsServer = space.GetApp(dns.APP_ID).(dns.Server)
return nil
})
return r
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}
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func (this *Router) Release() {
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}
// Private: Visible for testing.
func (this *Router) ResolveIP(dest v2net.Destination) []v2net.Destination {
ips := this.dnsServer.Get(dest.Address.Domain())
if len(ips) == 0 {
return nil
}
dests := make([]v2net.Destination, len(ips))
for idx, ip := range ips {
if dest.Network == v2net.Network_TCP {
dests[idx] = v2net.TCPDestination(v2net.IPAddress(ip), dest.Port)
} else {
dests[idx] = v2net.UDPDestination(v2net.IPAddress(ip), dest.Port)
}
}
return dests
}
func (this *Router) takeDetourWithoutCache(dest v2net.Destination) (string, error) {
for _, rule := range this.rules {
if rule.Apply(dest) {
return rule.Tag, nil
}
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}
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if this.domainStrategy == Config_IpIfNonMatch && dest.Address.Family().IsDomain() {
log.Info("Router: Looking up IP for ", dest)
ipDests := this.ResolveIP(dest)
if ipDests != nil {
for _, ipDest := range ipDests {
log.Info("Router: Trying IP ", ipDest)
for _, rule := range this.rules {
if rule.Apply(ipDest) {
return rule.Tag, nil
}
}
}
}
}
return "", ErrNoRuleApplicable
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}
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func (this *Router) TakeDetour(dest v2net.Destination) (string, error) {
destStr := dest.String()
found, tag, err := this.cache.Get(destStr)
if !found {
tag, err := this.takeDetourWithoutCache(dest)
this.cache.Set(destStr, tag, err)
return tag, err
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}
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return tag, err
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}