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Unified drain support for vmess and shadowsocks (#791)

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* Added test for no terminate signal

* unified drain support for vmess and shadowsockets

* drain: add generated file

Co-authored-by: Shelikhoo <xiaokangwang@outlook.com>
This commit is contained in:
yuhan6665 2021-12-14 19:27:31 -05:00 • committed by GitHub
parent 6fb5c887b2
commit d5a7901601
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 277 additions and 66 deletions
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34
proxy/vmess/encoding/server.go
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@ -12,13 +12,14 @@ import (
"sync"
"time"
"github.com/xtls/xray-core/common/drain"
"golang.org/x/crypto/chacha20poly1305"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/bitmask"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/crypto"
"github.com/xtls/xray-core/common/dice"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol"
"github.com/xtls/xray-core/common/task"
@ -138,22 +139,18 @@ func parseSecurityType(b byte) protocol.SecurityType {
// DecodeRequestHeader decodes and returns (if successful) a RequestHeader from an input stream.
func (s *ServerSession) DecodeRequestHeader(reader io.Reader, isDrain bool) (*protocol.RequestHeader, error) {
buffer := buf.New()
behaviorRand := dice.NewDeterministicDice(int64(s.userValidator.GetBehaviorSeed()))
BaseDrainSize := behaviorRand.Roll(3266)
RandDrainMax := behaviorRand.Roll(64) + 1
RandDrainRolled := dice.Roll(RandDrainMax)
DrainSize := BaseDrainSize + 16 + 38 + RandDrainRolled
readSizeRemain := DrainSize
drainer, err := drain.NewBehaviorSeedLimitedDrainer(int64(s.userValidator.GetBehaviorSeed()), 16+38, 3266, 64)
if err != nil {
return nil, newError("failed to initialize drainer").Base(err)
}
drainConnection := func(e error) error {
// We read a deterministic generated length of data before closing the connection to offset padding read pattern
readSizeRemain -= int(buffer.Len())
if readSizeRemain > 0 && isDrain {
err := s.DrainConnN(reader, readSizeRemain)
if err != nil {
return newError("failed to drain connection DrainSize = ", BaseDrainSize, " ", RandDrainMax, " ", RandDrainRolled).Base(err).Base(e)
}
return newError("connection drained DrainSize = ", BaseDrainSize, " ", RandDrainMax, " ", RandDrainRolled).Base(e)
drainer.AcknowledgeReceive(int(buffer.Len()))
if isDrain {
return drain.WithError(drainer, reader, e)
}
return e
}
@ -182,7 +179,7 @@ func (s *ServerSession) DecodeRequestHeader(reader io.Reader, isDrain bool) (*pr
aeadData, shouldDrain, bytesRead, errorReason := vmessaead.OpenVMessAEADHeader(fixedSizeCmdKey, fixedSizeAuthID, reader)
if errorReason != nil {
if shouldDrain {
readSizeRemain -= bytesRead
drainer.AcknowledgeReceive(bytesRead)
return nil, drainConnection(newError("AEAD read failed").Base(errorReason))
} else {
return nil, drainConnection(newError("AEAD read failed, drain skipped").Base(errorReason))
@ -213,7 +210,7 @@ func (s *ServerSession) DecodeRequestHeader(reader io.Reader, isDrain bool) (*pr
return nil, drainConnection(newError("invalid user").Base(errorAEAD))
}
readSizeRemain -= int(buffer.Len())
drainer.AcknowledgeReceive(int(buffer.Len()))
buffer.Clear()
if _, err := buffer.ReadFullFrom(decryptor, 38); err != nil {
return nil, newError("failed to read request header").Base(err)
@ -542,8 +539,3 @@ func (s *ServerSession) EncodeResponseBody(request *protocol.RequestHeader, writ
panic("Unknown security type.")
}
}
func (s *ServerSession) DrainConnN(reader io.Reader, n int) error {
_, err := io.CopyN(io.Discard, reader, int64(n))
return err
}