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vmess.go
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vmess.go
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// Package vmess contains the implementation of VMess protocol and transportation.
//
// VMess contains both inbound and outbound connections. VMess inbound is usually used on servers
// together with 'freedom' to talk to final destination, while VMess outbound is usually used on
// clients with 'socks' for proxying.
package vmess // import "github.com/v2ray/v2ray-core/proxy/vmess"
import (
"sync"
"time"
"github.com/v2ray/v2ray-core/common/dice"
"github.com/v2ray/v2ray-core/common/protocol"
"github.com/v2ray/v2ray-core/common/signal"
)
type Account struct {
ID *protocol.ID
AlterIDs []*protocol.ID
}
func (this *Account) AnyValidID() *protocol.ID {
if len(this.AlterIDs) == 0 {
return this.ID
}
return this.AlterIDs[dice.Roll(len(this.AlterIDs))]
}
func (this *Account) Equals(account protocol.Account) bool {
vmessAccount, ok := account.(*Account)
if !ok {
return false
}
// TODO: handle AlterIds difference
return this.ID.Equals(vmessAccount.ID)
}
const (
updateIntervalSec = 10
cacheDurationSec = 120
)
type idEntry struct {
id *protocol.ID
userIdx int
lastSec protocol.Timestamp
lastSecRemoval protocol.Timestamp
}
type TimedUserValidator struct {
sync.RWMutex
running bool
validUsers []*protocol.User
userHash map[[16]byte]*indexTimePair
ids []*idEntry
hasher protocol.IDHash
cancel *signal.CancelSignal
}
type indexTimePair struct {
index int
timeSec protocol.Timestamp
}
func NewTimedUserValidator(hasher protocol.IDHash) protocol.UserValidator {
tus := &TimedUserValidator{
validUsers: make([]*protocol.User, 0, 16),
userHash: make(map[[16]byte]*indexTimePair, 512),
ids: make([]*idEntry, 0, 512),
hasher: hasher,
running: true,
cancel: signal.NewCloseSignal(),
}
go tus.updateUserHash(updateIntervalSec * time.Second)
return tus
}
func (this *TimedUserValidator) Release() {
if !this.running {
return
}
this.cancel.Cancel()
<-this.cancel.WaitForDone()
this.Lock()
defer this.Unlock()
if !this.running {
return
}
this.running = false
this.validUsers = nil
this.userHash = nil
this.ids = nil
this.hasher = nil
this.cancel = nil
}
func (this *TimedUserValidator) generateNewHashes(nowSec protocol.Timestamp, idx int, entry *idEntry) {
var hashValue [16]byte
var hashValueRemoval [16]byte
idHash := this.hasher(entry.id.Bytes())
for entry.lastSec <= nowSec {
idHash.Write(entry.lastSec.Bytes(nil))
idHash.Sum(hashValue[:0])
idHash.Reset()
idHash.Write(entry.lastSecRemoval.Bytes(nil))
idHash.Sum(hashValueRemoval[:0])
idHash.Reset()
this.Lock()
this.userHash[hashValue] = &indexTimePair{idx, entry.lastSec}
delete(this.userHash, hashValueRemoval)
this.Unlock()
entry.lastSec++
entry.lastSecRemoval++
}
}
func (this *TimedUserValidator) updateUserHash(interval time.Duration) {
L:
for {
select {
case now := <-time.After(interval):
nowSec := protocol.Timestamp(now.Unix() + cacheDurationSec)
for _, entry := range this.ids {
this.generateNewHashes(nowSec, entry.userIdx, entry)
}
case <-this.cancel.WaitForCancel():
break L
}
}
this.cancel.Done()
}
func (this *TimedUserValidator) Add(user *protocol.User) error {
idx := len(this.validUsers)
this.validUsers = append(this.validUsers, user)
account := user.Account.(*Account)
nowSec := time.Now().Unix()
entry := &idEntry{
id: account.ID,
userIdx: idx,
lastSec: protocol.Timestamp(nowSec - cacheDurationSec),
lastSecRemoval: protocol.Timestamp(nowSec - cacheDurationSec*3),
}
this.generateNewHashes(protocol.Timestamp(nowSec+cacheDurationSec), idx, entry)
this.ids = append(this.ids, entry)
for _, alterid := range account.AlterIDs {
entry := &idEntry{
id: alterid,
userIdx: idx,
lastSec: protocol.Timestamp(nowSec - cacheDurationSec),
lastSecRemoval: protocol.Timestamp(nowSec - cacheDurationSec*3),
}
this.generateNewHashes(protocol.Timestamp(nowSec+cacheDurationSec), idx, entry)
this.ids = append(this.ids, entry)
}
return nil
}
func (this *TimedUserValidator) Get(userHash []byte) (*protocol.User, protocol.Timestamp, bool) {
defer this.RUnlock()
this.RLock()
if !this.running {
return nil, 0, false
}
var fixedSizeHash [16]byte
copy(fixedSizeHash[:], userHash)
pair, found := this.userHash[fixedSizeHash]
if found {
return this.validUsers[pair.index], pair.timeSec, true
}
return nil, 0, false
}