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|
package socks5
import (
"errors"
"io"
"log"
)
var (
// ErrBadReply is the error when read reply
ErrBadReply = errors.New("Bad Reply")
)
// NewNegotiationRequest return negotiation request packet can be writed into server
func NewNegotiationRequest(methods []byte) *NegotiationRequest {
return &NegotiationRequest{
Ver: Ver,
NMethods: byte(len(methods)),
Methods: methods,
}
}
// WriteTo write negotiation request packet into server
func (r *NegotiationRequest) WriteTo(w io.Writer) (int64, error) {
i, err := w.Write(append([]byte{r.Ver, r.NMethods}, r.Methods...))
if err != nil {
return 0, err
}
if Debug {
log.Printf("Sent NegotiationRequest: %#v %#v %#v\n", r.Ver, r.NMethods, r.Methods)
}
return int64(i), nil
}
// NewNegotiationReplyFrom read negotiation reply packet from server
func NewNegotiationReplyFrom(r io.Reader) (*NegotiationReply, error) {
bb := make([]byte, 2)
if _, err := io.ReadFull(r, bb); err != nil {
return nil, err
}
if bb[0] != Ver {
return nil, ErrVersion
}
if Debug {
log.Printf("Got NegotiationReply: %#v %#v\n", bb[0], bb[1])
}
return &NegotiationReply{
Ver: bb[0],
Method: bb[1],
}, nil
}
// NewUserPassNegotiationRequest return user password negotiation request packet can be writed into server
func NewUserPassNegotiationRequest(username []byte, password []byte) *UserPassNegotiationRequest {
return &UserPassNegotiationRequest{
Ver: UserPassVer,
Ulen: byte(len(username)),
Uname: username,
Plen: byte(len(password)),
Passwd: password,
}
}
// WriteTo write user password negotiation request packet into server
func (r *UserPassNegotiationRequest) WriteTo(w io.Writer) (int64, error) {
i, err := w.Write(append(append(append([]byte{r.Ver, r.Ulen}, r.Uname...), r.Plen), r.Passwd...))
if err != nil {
return 0, err
}
if Debug {
log.Printf("Sent UserNameNegotiationRequest: %#v %#v %#v %#v %#v\n", r.Ver, r.Ulen, r.Uname, r.Plen, r.Passwd)
}
return int64(i), nil
}
// NewUserPassNegotiationReplyFrom read user password negotiation reply packet from server
func NewUserPassNegotiationReplyFrom(r io.Reader) (*UserPassNegotiationReply, error) {
bb := make([]byte, 2)
if _, err := io.ReadFull(r, bb); err != nil {
return nil, err
}
if bb[0] != UserPassVer {
return nil, ErrUserPassVersion
}
if Debug {
log.Printf("Got UserPassNegotiationReply: %#v %#v \n", bb[0], bb[1])
}
return &UserPassNegotiationReply{
Ver: bb[0],
Status: bb[1],
}, nil
}
// NewRequest return request packet can be writed into server, dstaddr should not have domain length
func NewRequest(cmd byte, atyp byte, dstaddr []byte, dstport []byte) *Request {
if atyp == ATYPDomain {
dstaddr = append([]byte{byte(len(dstaddr))}, dstaddr...)
}
return &Request{
Ver: Ver,
Cmd: cmd,
Rsv: 0x00,
Atyp: atyp,
DstAddr: dstaddr,
DstPort: dstport,
}
}
// WriteTo write request packet into server
func (r *Request) WriteTo(w io.Writer) (int64, error) {
i, err := w.Write(append(append([]byte{r.Ver, r.Cmd, r.Rsv, r.Atyp}, r.DstAddr...), r.DstPort...))
if err != nil {
return 0, err
}
if Debug {
log.Printf("Sent Request: %#v %#v %#v %#v %#v %#v\n", r.Ver, r.Cmd, r.Rsv, r.Atyp, r.DstAddr, r.DstPort)
}
return int64(i), nil
}
// NewReplyFrom read reply packet from server
func NewReplyFrom(r io.Reader) (*Reply, error) {
bb := make([]byte, 4)
if _, err := io.ReadFull(r, bb); err != nil {
return nil, err
}
if bb[0] != Ver {
return nil, ErrVersion
}
var addr []byte
if bb[3] == ATYPIPv4 {
addr = make([]byte, 4)
if _, err := io.ReadFull(r, addr); err != nil {
return nil, err
}
} else if bb[3] == ATYPIPv6 {
addr = make([]byte, 16)
if _, err := io.ReadFull(r, addr); err != nil {
return nil, err
}
} else if bb[3] == ATYPDomain {
dal := make([]byte, 1)
if _, err := io.ReadFull(r, dal); err != nil {
return nil, err
}
if dal[0] == 0 {
return nil, ErrBadReply
}
addr = make([]byte, int(dal[0]))
if _, err := io.ReadFull(r, addr); err != nil {
return nil, err
}
addr = append(dal, addr...)
} else {
return nil, ErrBadReply
}
port := make([]byte, 2)
if _, err := io.ReadFull(r, port); err != nil {
return nil, err
}
if Debug {
log.Printf("Got Reply: %#v %#v %#v %#v %#v %#v\n", bb[0], bb[1], bb[2], bb[3], addr, port)
}
return &Reply{
Ver: bb[0],
Rep: bb[1],
Rsv: bb[2],
Atyp: bb[3],
BndAddr: addr,
BndPort: port,
}, nil
}
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