mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-22 08:31:30 +00:00
120 lines
3 KiB
Go
120 lines
3 KiB
Go
package hysteria
|
|
|
|
import (
|
|
"crypto/sha256"
|
|
"math/rand"
|
|
"net"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/sagernet/sing/common"
|
|
"github.com/sagernet/sing/common/buf"
|
|
"github.com/sagernet/sing/common/bufio"
|
|
E "github.com/sagernet/sing/common/exceptions"
|
|
M "github.com/sagernet/sing/common/metadata"
|
|
N "github.com/sagernet/sing/common/network"
|
|
)
|
|
|
|
const xplusSaltLen = 16
|
|
|
|
var errInalidPacket = E.New("invalid packet")
|
|
|
|
func NewXPlusPacketConn(conn net.PacketConn, key []byte) net.PacketConn {
|
|
vectorisedWriter, isVectorised := bufio.CreateVectorisedPacketWriter(conn)
|
|
if isVectorised {
|
|
return &VectorisedXPlusConn{
|
|
XPlusPacketConn: XPlusPacketConn{
|
|
PacketConn: conn,
|
|
key: key,
|
|
rand: rand.New(rand.NewSource(time.Now().UnixNano())),
|
|
},
|
|
writer: vectorisedWriter,
|
|
}
|
|
} else {
|
|
return &XPlusPacketConn{
|
|
PacketConn: conn,
|
|
key: key,
|
|
rand: rand.New(rand.NewSource(time.Now().UnixNano())),
|
|
}
|
|
}
|
|
}
|
|
|
|
type XPlusPacketConn struct {
|
|
net.PacketConn
|
|
key []byte
|
|
randAccess sync.Mutex
|
|
rand *rand.Rand
|
|
}
|
|
|
|
func (c *XPlusPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
|
|
n, addr, err = c.PacketConn.ReadFrom(p)
|
|
if err != nil {
|
|
return
|
|
} else if n < xplusSaltLen {
|
|
return 0, nil, errInalidPacket
|
|
}
|
|
key := sha256.Sum256(append(c.key, p[:xplusSaltLen]...))
|
|
for i := range p[xplusSaltLen:] {
|
|
p[i] = p[xplusSaltLen+i] ^ key[i%sha256.Size]
|
|
}
|
|
n -= xplusSaltLen
|
|
return
|
|
}
|
|
|
|
func (c *XPlusPacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
|
|
// can't use unsafe buffer on WriteTo
|
|
buffer := buf.NewSize(len(p) + xplusSaltLen)
|
|
defer buffer.Release()
|
|
salt := buffer.Extend(xplusSaltLen)
|
|
c.randAccess.Lock()
|
|
_, _ = c.rand.Read(salt)
|
|
c.randAccess.Unlock()
|
|
key := sha256.Sum256(append(c.key, salt...))
|
|
for i := range p {
|
|
common.Must(buffer.WriteByte(p[i] ^ key[i%sha256.Size]))
|
|
}
|
|
return c.PacketConn.WriteTo(buffer.Bytes(), addr)
|
|
}
|
|
|
|
func (c *XPlusPacketConn) Upstream() any {
|
|
return c.PacketConn
|
|
}
|
|
|
|
type VectorisedXPlusConn struct {
|
|
XPlusPacketConn
|
|
writer N.VectorisedPacketWriter
|
|
}
|
|
|
|
func (c *VectorisedXPlusConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
|
|
header := buf.NewSize(xplusSaltLen)
|
|
defer header.Release()
|
|
salt := header.Extend(xplusSaltLen)
|
|
c.randAccess.Lock()
|
|
_, _ = c.rand.Read(salt)
|
|
c.randAccess.Unlock()
|
|
key := sha256.Sum256(append(c.key, salt...))
|
|
for i := range p {
|
|
p[i] ^= key[i%sha256.Size]
|
|
}
|
|
return bufio.WriteVectorisedPacket(c.writer, [][]byte{header.Bytes(), p}, M.SocksaddrFromNet(addr))
|
|
}
|
|
|
|
func (c *VectorisedXPlusConn) WriteVectorisedPacket(buffers []*buf.Buffer, destination M.Socksaddr) error {
|
|
header := buf.NewSize(xplusSaltLen)
|
|
salt := header.Extend(xplusSaltLen)
|
|
c.randAccess.Lock()
|
|
_, _ = c.rand.Read(salt)
|
|
c.randAccess.Unlock()
|
|
key := sha256.Sum256(append(c.key, salt...))
|
|
var index int
|
|
for _, buffer := range buffers {
|
|
data := buffer.Bytes()
|
|
for i := range data {
|
|
data[i] ^= key[index%sha256.Size]
|
|
index++
|
|
}
|
|
}
|
|
buffers = append([]*buf.Buffer{header}, buffers...)
|
|
return c.writer.WriteVectorisedPacket(buffers, destination)
|
|
}
|