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v2fly/app/router/router.go

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package router
import (
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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"
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"v2ray.com/core/common/errors"
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"v2ray.com/core/common/log"
v2net "v2ray.com/core/common/net"
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"v2ray.com/core/common/serial"
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"v2ray.com/core/proxy"
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)
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var (
ErrInvalidRule = errors.New("Invalid Rule")
ErrNoRuleApplicable = errors.New("No rule applicable")
)
type Router struct {
domainStrategy Config_DomainStrategy
rules []Rule
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// 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,
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//cache: NewRoutingTable(),
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 {
r.rules[idx].Tag = rule.Tag
cond, err := rule.BuildCondition()
if err != nil {
return err
}
r.rules[idx].Condition = cond
}
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r.dnsServer = dns.FromSpace(space)
if r.dnsServer == nil {
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return errors.New("Router: DNS is not found in the space.")
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}
return nil
})
return r
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}
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// Private: Visible for testing.
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func (v *Router) ResolveIP(dest v2net.Destination) []v2net.Destination {
ips := v.dnsServer.Get(dest.Address.Domain())
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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
}
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func (v *Router) takeDetourWithoutCache(session *proxy.SessionInfo) (string, error) {
for _, rule := range v.rules {
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if rule.Apply(session) {
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return rule.Tag, nil
}
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}
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dest := session.Destination
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if v.domainStrategy == Config_IpIfNonMatch && dest.Address.Family().IsDomain() {
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log.Info("Router: Looking up IP for ", dest)
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ipDests := v.ResolveIP(dest)
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if ipDests != nil {
for _, ipDest := range ipDests {
log.Info("Router: Trying IP ", ipDest)
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for _, rule := range v.rules {
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if rule.Apply(&proxy.SessionInfo{
Source: session.Source,
Destination: ipDest,
User: session.User,
}) {
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return rule.Tag, nil
}
}
}
}
}
return "", ErrNoRuleApplicable
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}
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func (v *Router) TakeDetour(session *proxy.SessionInfo) (string, error) {
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//destStr := dest.String()
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//found, tag, err := v.cache.Get(destStr)
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//if !found {
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tag, err := v.takeDetourWithoutCache(session)
//v.cache.Set(destStr, tag, err)
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return tag, err
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//}
//return tag, err
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}
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type RouterFactory struct{}
func (RouterFactory) Create(space app.Space, config interface{}) (app.Application, error) {
router := NewRouter(config.(*Config), space)
return router, nil
}
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func FromSpace(space app.Space) *Router {
app := space.(app.AppGetter).GetApp(serial.GetMessageType((*Config)(nil)))
if app == nil {
return nil
}
return app.(*Router)
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}
func init() {
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common.Must(app.RegisterApplicationFactory((*Config)(nil), RouterFactory{}))
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}