github.com/MicalKarl/sing-shadowsocks@v0.0.5/shadowsocks.go (about)

     1  package shadowsocks
     2  
     3  import (
     4  	"crypto/md5"
     5  	"net"
     6  
     7  	"github.com/sagernet/sing/common"
     8  	E "github.com/sagernet/sing/common/exceptions"
     9  	F "github.com/sagernet/sing/common/format"
    10  	M "github.com/sagernet/sing/common/metadata"
    11  	N "github.com/sagernet/sing/common/network"
    12  )
    13  
    14  var (
    15  	ErrBadKey          = E.New("bad key")
    16  	ErrMissingPassword = E.New("missing password")
    17  	ErrNoUsers         = E.New("no users")
    18  )
    19  
    20  type Method interface {
    21  	Name() string
    22  	DialConn(conn net.Conn, destination M.Socksaddr) (net.Conn, error)
    23  	DialEarlyConn(conn net.Conn, destination M.Socksaddr) net.Conn
    24  	DialPacketConn(conn net.Conn) N.NetPacketConn
    25  }
    26  
    27  type Service interface {
    28  	Name() string
    29  	Password() string
    30  	N.TCPConnectionHandler
    31  	N.UDPHandler
    32  	E.Handler
    33  }
    34  
    35  type MultiService[U comparable] interface {
    36  	Name() string
    37  	UpdateUsers(userList []U, keyList [][]byte) error
    38  	UpdateUsersWithPasswords(userList []U, passwordList []string) error
    39  	N.TCPConnectionHandler
    40  	N.UDPHandler
    41  	E.Handler
    42  }
    43  
    44  type Handler interface {
    45  	N.TCPConnectionHandler
    46  	N.UDPConnectionHandler
    47  	E.Handler
    48  }
    49  
    50  type ServerConnError struct {
    51  	net.Conn
    52  	Source M.Socksaddr
    53  	Cause  error
    54  }
    55  
    56  func (e *ServerConnError) Close() error {
    57  	if conn, ok := common.Cast[*net.TCPConn](e.Conn); ok {
    58  		conn.SetLinger(0)
    59  	}
    60  	return e.Conn.Close()
    61  }
    62  
    63  func (e *ServerConnError) Unwrap() error {
    64  	return e.Cause
    65  }
    66  
    67  func (e *ServerConnError) Error() string {
    68  	return F.ToString("shadowsocks: serve TCP from ", e.Source, ": ", e.Cause)
    69  }
    70  
    71  type ServerPacketError struct {
    72  	Source M.Socksaddr
    73  	Cause  error
    74  }
    75  
    76  func (e *ServerPacketError) Unwrap() error {
    77  	return e.Cause
    78  }
    79  
    80  func (e *ServerPacketError) Error() string {
    81  	return F.ToString("shadowsocks: serve UDP from ", e.Source, ": ", e.Cause)
    82  }
    83  
    84  func Key(password []byte, keySize int) []byte {
    85  	var b, prev []byte
    86  	h := md5.New()
    87  	for len(b) < keySize {
    88  		h.Write(prev)
    89  		h.Write(password)
    90  		b = h.Sum(b)
    91  		prev = b[len(b)-h.Size():]
    92  		h.Reset()
    93  	}
    94  	return b[:keySize]
    95  }