mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-10 02:53:12 +00:00
107 lines
2.8 KiB
Go
107 lines
2.8 KiB
Go
package hysteria2
|
|
|
|
import (
|
|
"net"
|
|
|
|
"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"
|
|
|
|
"golang.org/x/crypto/blake2b"
|
|
)
|
|
|
|
const salamanderSaltLen = 8
|
|
|
|
const ObfsTypeSalamander = "salamander"
|
|
|
|
type Salamander struct {
|
|
net.PacketConn
|
|
password []byte
|
|
}
|
|
|
|
func NewSalamanderConn(conn net.PacketConn, password []byte) net.PacketConn {
|
|
writer, isVectorised := bufio.CreateVectorisedPacketWriter(conn)
|
|
if isVectorised {
|
|
return &VectorisedSalamander{
|
|
Salamander: Salamander{
|
|
PacketConn: conn,
|
|
password: password,
|
|
},
|
|
writer: writer,
|
|
}
|
|
} else {
|
|
return &Salamander{
|
|
PacketConn: conn,
|
|
password: password,
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *Salamander) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
|
|
n, addr, err = s.PacketConn.ReadFrom(p)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if n <= salamanderSaltLen {
|
|
return 0, nil, E.New("salamander: packet too short")
|
|
}
|
|
key := blake2b.Sum256(append(s.password, p[:salamanderSaltLen]...))
|
|
for index, c := range p[salamanderSaltLen:n] {
|
|
p[index] = c ^ key[index%blake2b.Size256]
|
|
}
|
|
return n - salamanderSaltLen, addr, nil
|
|
}
|
|
|
|
func (s *Salamander) WriteTo(p []byte, addr net.Addr) (n int, err error) {
|
|
buffer := buf.NewSize(len(p) + salamanderSaltLen)
|
|
defer buffer.Release()
|
|
buffer.WriteRandom(salamanderSaltLen)
|
|
key := blake2b.Sum256(append(s.password, buffer.Bytes()...))
|
|
for index, c := range p {
|
|
common.Must(buffer.WriteByte(c ^ key[index%blake2b.Size256]))
|
|
}
|
|
_, err = s.PacketConn.WriteTo(buffer.Bytes(), addr)
|
|
if err != nil {
|
|
return
|
|
}
|
|
return len(p), nil
|
|
}
|
|
|
|
type VectorisedSalamander struct {
|
|
Salamander
|
|
writer N.VectorisedPacketWriter
|
|
}
|
|
|
|
func (s *VectorisedSalamander) WriteTo(p []byte, addr net.Addr) (n int, err error) {
|
|
buffer := buf.NewSize(salamanderSaltLen)
|
|
buffer.WriteRandom(salamanderSaltLen)
|
|
key := blake2b.Sum256(append(s.password, buffer.Bytes()...))
|
|
for i := range p {
|
|
p[i] ^= key[i%blake2b.Size256]
|
|
}
|
|
err = s.writer.WriteVectorisedPacket([]*buf.Buffer{buffer, buf.As(p)}, M.SocksaddrFromNet(addr))
|
|
if err != nil {
|
|
return
|
|
}
|
|
return len(p), nil
|
|
}
|
|
|
|
func (s *VectorisedSalamander) WriteVectorisedPacket(buffers []*buf.Buffer, destination M.Socksaddr) error {
|
|
header := buf.NewSize(salamanderSaltLen)
|
|
defer header.Release()
|
|
header.WriteRandom(salamanderSaltLen)
|
|
key := blake2b.Sum256(append(s.password, header.Bytes()...))
|
|
var bufferIndex int
|
|
for _, buffer := range buffers {
|
|
content := buffer.Bytes()
|
|
for index, c := range content {
|
|
content[bufferIndex+index] = c ^ key[bufferIndex+index%blake2b.Size256]
|
|
}
|
|
bufferIndex += len(content)
|
|
}
|
|
return s.writer.WriteVectorisedPacket(append([]*buf.Buffer{header}, buffers...), destination)
|
|
}
|