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80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
package vless
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import (
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"bytes"
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"encoding/binary"
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"github.com/Dreamacro/clash/common/buf"
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"github.com/Dreamacro/clash/log"
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"github.com/gofrs/uuid"
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"github.com/zhangyunhao116/fastrand"
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)
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const (
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paddingHeaderLen = 1 + 2 + 2 // =5
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commandPaddingContinue byte = 0x00
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commandPaddingEnd byte = 0x01
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commandPaddingDirect byte = 0x02
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)
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func WriteWithPadding(buffer *buf.Buffer, p []byte, command byte, userUUID *uuid.UUID, paddingTLS bool) {
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contentLen := int32(len(p))
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var paddingLen int32
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if contentLen < 900 && paddingTLS {
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log.Debugln("long padding")
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paddingLen = fastrand.Int31n(500) + 900 - contentLen
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} else {
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paddingLen = fastrand.Int31n(256)
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}
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if paddingLen > buf.BufferSize-21-contentLen {
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paddingLen = buf.BufferSize - 21 - contentLen
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}
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if userUUID != nil { // unnecessary, but keep the same with Xray
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buffer.Write(userUUID.Bytes())
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}
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buffer.WriteByte(command)
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binary.BigEndian.PutUint16(buffer.Extend(2), uint16(contentLen))
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binary.BigEndian.PutUint16(buffer.Extend(2), uint16(paddingLen))
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buffer.Write(p)
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buffer.Extend(int(paddingLen))
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log.Debugln("XTLS Vision write padding1: command=%v, payloadLen=%v, paddingLen=%v", command, contentLen, paddingLen)
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}
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func ApplyPadding(buffer *buf.Buffer, command byte, userUUID *uuid.UUID, paddingTLS bool) {
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contentLen := int32(buffer.Len())
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var paddingLen int32
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if contentLen < 900 && paddingTLS {
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log.Debugln("long padding")
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paddingLen = fastrand.Int31n(500) + 900 - contentLen
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} else {
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paddingLen = fastrand.Int31n(256)
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}
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if paddingLen > buf.BufferSize-21-contentLen {
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paddingLen = buf.BufferSize - 21 - contentLen
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}
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binary.BigEndian.PutUint16(buffer.ExtendHeader(2), uint16(paddingLen))
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binary.BigEndian.PutUint16(buffer.ExtendHeader(2), uint16(contentLen))
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buffer.ExtendHeader(1)[0] = command
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if userUUID != nil { // unnecessary, but keep the same with Xray
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copy(buffer.ExtendHeader(uuid.Size), userUUID.Bytes())
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}
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buffer.Extend(int(paddingLen))
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log.Debugln("XTLS Vision write padding2: command=%d, payloadLen=%d, paddingLen=%d", command, contentLen, paddingLen)
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}
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func ReshapeBuffer(buffer *buf.Buffer) *buf.Buffer {
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if buffer.Len() <= buf.BufferSize-paddingHeaderLen {
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return nil
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}
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cutAt := bytes.LastIndex(buffer.Bytes(), tlsApplicationDataStart)
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if cutAt == -1 {
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cutAt = buf.BufferSize / 2
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}
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buffer2 := buf.New()
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buffer2.Write(buffer.From(cutAt))
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buffer.Truncate(cutAt)
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return buffer2
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}
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