mirror of https://github.com/pkg/sftp.git
960 lines
22 KiB
Go
960 lines
22 KiB
Go
package sftp
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import (
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"bytes"
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"encoding"
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"encoding/binary"
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"fmt"
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"io"
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"os"
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"reflect"
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"github.com/pkg/errors"
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)
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var (
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errShortPacket = errors.New("packet too short")
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errUnknownExtendedPacket = errors.New("unknown extended packet")
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)
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const (
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debugDumpTxPacket = false
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debugDumpRxPacket = false
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debugDumpTxPacketBytes = false
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debugDumpRxPacketBytes = false
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)
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func marshalUint32(b []byte, v uint32) []byte {
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return append(b, byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
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}
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func marshalUint64(b []byte, v uint64) []byte {
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return marshalUint32(marshalUint32(b, uint32(v>>32)), uint32(v))
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}
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func marshalString(b []byte, v string) []byte {
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return append(marshalUint32(b, uint32(len(v))), v...)
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}
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func marshal(b []byte, v interface{}) []byte {
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if v == nil {
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return b
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}
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switch v := v.(type) {
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case uint8:
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return append(b, v)
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case uint32:
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return marshalUint32(b, v)
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case uint64:
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return marshalUint64(b, v)
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case string:
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return marshalString(b, v)
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case os.FileInfo:
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return marshalFileInfo(b, v)
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default:
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switch d := reflect.ValueOf(v); d.Kind() {
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case reflect.Struct:
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for i, n := 0, d.NumField(); i < n; i++ {
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b = append(marshal(b, d.Field(i).Interface()))
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}
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return b
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case reflect.Slice:
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for i, n := 0, d.Len(); i < n; i++ {
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b = append(marshal(b, d.Index(i).Interface()))
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}
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return b
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default:
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panic(fmt.Sprintf("marshal(%#v): cannot handle type %T", v, v))
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}
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}
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}
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func unmarshalUint32(b []byte) (uint32, []byte) {
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v := uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
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return v, b[4:]
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}
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func unmarshalUint32Safe(b []byte) (uint32, []byte, error) {
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var v uint32
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if len(b) < 4 {
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return 0, nil, errShortPacket
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}
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v, b = unmarshalUint32(b)
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return v, b, nil
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}
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func unmarshalUint64(b []byte) (uint64, []byte) {
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h, b := unmarshalUint32(b)
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l, b := unmarshalUint32(b)
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return uint64(h)<<32 | uint64(l), b
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}
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func unmarshalUint64Safe(b []byte) (uint64, []byte, error) {
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var v uint64
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if len(b) < 8 {
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return 0, nil, errShortPacket
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}
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v, b = unmarshalUint64(b)
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return v, b, nil
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}
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func unmarshalString(b []byte) (string, []byte) {
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n, b := unmarshalUint32(b)
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return string(b[:n]), b[n:]
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}
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func unmarshalStringSafe(b []byte) (string, []byte, error) {
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n, b, err := unmarshalUint32Safe(b)
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if err != nil {
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return "", nil, err
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}
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if int64(n) > int64(len(b)) {
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return "", nil, errShortPacket
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}
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return string(b[:n]), b[n:], nil
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}
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// sendPacket marshals p according to RFC 4234.
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func sendPacket(w io.Writer, m encoding.BinaryMarshaler) error {
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bb, err := m.MarshalBinary()
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if err != nil {
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return errors.Errorf("binary marshaller failed: %v", err)
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}
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if debugDumpTxPacketBytes {
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debug("send packet: %s %d bytes %x", fxp(bb[0]), len(bb), bb[1:])
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} else if debugDumpTxPacket {
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debug("send packet: %s %d bytes", fxp(bb[0]), len(bb))
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}
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// Slide packet down 4 bytes to make room for length header.
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packet := append(bb, make([]byte, 4)...) // optimistically assume bb has capacity
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copy(packet[4:], bb)
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binary.BigEndian.PutUint32(packet[:4], uint32(len(bb)))
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_, err = w.Write(packet)
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if err != nil {
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return errors.Errorf("failed to send packet: %v", err)
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}
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return nil
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}
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func recvPacket(r io.Reader) (uint8, []byte, error) {
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var b = []byte{0, 0, 0, 0}
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if _, err := io.ReadFull(r, b); err != nil {
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return 0, nil, err
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}
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l, _ := unmarshalUint32(b)
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b = make([]byte, l)
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if _, err := io.ReadFull(r, b); err != nil {
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debug("recv packet %d bytes: err %v", l, err)
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return 0, nil, err
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}
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if debugDumpRxPacketBytes {
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debug("recv packet: %s %d bytes %x", fxp(b[0]), l, b[1:])
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} else if debugDumpRxPacket {
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debug("recv packet: %s %d bytes", fxp(b[0]), l)
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}
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return b[0], b[1:], nil
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}
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type extensionPair struct {
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Name string
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Data string
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}
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func unmarshalExtensionPair(b []byte) (extensionPair, []byte, error) {
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var ep extensionPair
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var err error
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ep.Name, b, err = unmarshalStringSafe(b)
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if err != nil {
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return ep, b, err
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}
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ep.Data, b, err = unmarshalStringSafe(b)
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return ep, b, err
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}
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// Here starts the definition of packets along with their MarshalBinary
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// implementations.
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// Manually writing the marshalling logic wins us a lot of time and
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// allocation.
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type sshFxInitPacket struct {
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Version uint32
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Extensions []extensionPair
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}
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func (p sshFxInitPacket) MarshalBinary() ([]byte, error) {
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l := 1 + 4 // byte + uint32
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for _, e := range p.Extensions {
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l += 4 + len(e.Name) + 4 + len(e.Data)
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}
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b := make([]byte, 0, l)
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b = append(b, ssh_FXP_INIT)
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b = marshalUint32(b, p.Version)
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for _, e := range p.Extensions {
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b = marshalString(b, e.Name)
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b = marshalString(b, e.Data)
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}
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return b, nil
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}
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func (p *sshFxInitPacket) UnmarshalBinary(b []byte) error {
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var err error
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if p.Version, b, err = unmarshalUint32Safe(b); err != nil {
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return err
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}
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for len(b) > 0 {
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var ep extensionPair
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ep, b, err = unmarshalExtensionPair(b)
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if err != nil {
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return err
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}
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p.Extensions = append(p.Extensions, ep)
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}
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return nil
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}
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type sshFxVersionPacket struct {
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Version uint32
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Extensions []struct {
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Name, Data string
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}
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}
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func (p sshFxVersionPacket) MarshalBinary() ([]byte, error) {
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l := 1 + 4 // byte + uint32
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for _, e := range p.Extensions {
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l += 4 + len(e.Name) + 4 + len(e.Data)
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}
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b := make([]byte, 0, l)
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b = append(b, ssh_FXP_VERSION)
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b = marshalUint32(b, p.Version)
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for _, e := range p.Extensions {
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b = marshalString(b, e.Name)
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b = marshalString(b, e.Data)
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}
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return b, nil
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}
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func marshalIDString(packetType byte, id uint32, str string) ([]byte, error) {
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l := 1 + 4 + // type(byte) + uint32
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4 + len(str)
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b := make([]byte, 0, l)
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b = append(b, packetType)
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b = marshalUint32(b, id)
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b = marshalString(b, str)
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return b, nil
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}
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func unmarshalIDString(b []byte, id *uint32, str *string) error {
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var err error
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*id, b, err = unmarshalUint32Safe(b)
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if err != nil {
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return err
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}
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*str, _, err = unmarshalStringSafe(b)
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return err
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}
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type sshFxpReaddirPacket struct {
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ID uint32
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Handle string
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}
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func (p sshFxpReaddirPacket) id() uint32 { return p.ID }
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func (p sshFxpReaddirPacket) MarshalBinary() ([]byte, error) {
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return marshalIDString(ssh_FXP_READDIR, p.ID, p.Handle)
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}
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func (p *sshFxpReaddirPacket) UnmarshalBinary(b []byte) error {
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return unmarshalIDString(b, &p.ID, &p.Handle)
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}
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type sshFxpOpendirPacket struct {
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ID uint32
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Path string
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}
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func (p sshFxpOpendirPacket) id() uint32 { return p.ID }
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func (p sshFxpOpendirPacket) MarshalBinary() ([]byte, error) {
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return marshalIDString(ssh_FXP_OPENDIR, p.ID, p.Path)
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}
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func (p *sshFxpOpendirPacket) UnmarshalBinary(b []byte) error {
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return unmarshalIDString(b, &p.ID, &p.Path)
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}
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type sshFxpLstatPacket struct {
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ID uint32
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Path string
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}
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func (p sshFxpLstatPacket) id() uint32 { return p.ID }
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func (p sshFxpLstatPacket) MarshalBinary() ([]byte, error) {
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return marshalIDString(ssh_FXP_LSTAT, p.ID, p.Path)
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}
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func (p *sshFxpLstatPacket) UnmarshalBinary(b []byte) error {
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return unmarshalIDString(b, &p.ID, &p.Path)
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}
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type sshFxpStatPacket struct {
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ID uint32
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Path string
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}
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func (p sshFxpStatPacket) id() uint32 { return p.ID }
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func (p sshFxpStatPacket) MarshalBinary() ([]byte, error) {
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return marshalIDString(ssh_FXP_STAT, p.ID, p.Path)
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}
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func (p *sshFxpStatPacket) UnmarshalBinary(b []byte) error {
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return unmarshalIDString(b, &p.ID, &p.Path)
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}
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type sshFxpFstatPacket struct {
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ID uint32
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Handle string
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}
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func (p sshFxpFstatPacket) id() uint32 { return p.ID }
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func (p sshFxpFstatPacket) MarshalBinary() ([]byte, error) {
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return marshalIDString(ssh_FXP_FSTAT, p.ID, p.Handle)
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}
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func (p *sshFxpFstatPacket) UnmarshalBinary(b []byte) error {
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return unmarshalIDString(b, &p.ID, &p.Handle)
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}
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type sshFxpClosePacket struct {
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ID uint32
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Handle string
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}
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func (p sshFxpClosePacket) id() uint32 { return p.ID }
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func (p sshFxpClosePacket) MarshalBinary() ([]byte, error) {
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return marshalIDString(ssh_FXP_CLOSE, p.ID, p.Handle)
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}
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func (p *sshFxpClosePacket) UnmarshalBinary(b []byte) error {
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return unmarshalIDString(b, &p.ID, &p.Handle)
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}
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type sshFxpRemovePacket struct {
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ID uint32
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Filename string
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}
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func (p sshFxpRemovePacket) id() uint32 { return p.ID }
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func (p sshFxpRemovePacket) MarshalBinary() ([]byte, error) {
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return marshalIDString(ssh_FXP_REMOVE, p.ID, p.Filename)
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}
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func (p *sshFxpRemovePacket) UnmarshalBinary(b []byte) error {
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return unmarshalIDString(b, &p.ID, &p.Filename)
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}
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type sshFxpRmdirPacket struct {
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ID uint32
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Path string
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}
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func (p sshFxpRmdirPacket) id() uint32 { return p.ID }
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func (p sshFxpRmdirPacket) MarshalBinary() ([]byte, error) {
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return marshalIDString(ssh_FXP_RMDIR, p.ID, p.Path)
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}
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func (p *sshFxpRmdirPacket) UnmarshalBinary(b []byte) error {
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return unmarshalIDString(b, &p.ID, &p.Path)
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}
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type sshFxpSymlinkPacket struct {
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ID uint32
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Targetpath string
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Linkpath string
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}
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func (p sshFxpSymlinkPacket) id() uint32 { return p.ID }
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func (p sshFxpSymlinkPacket) MarshalBinary() ([]byte, error) {
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l := 1 + 4 + // type(byte) + uint32
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4 + len(p.Targetpath) +
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4 + len(p.Linkpath)
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b := make([]byte, 0, l)
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b = append(b, ssh_FXP_SYMLINK)
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b = marshalUint32(b, p.ID)
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b = marshalString(b, p.Targetpath)
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b = marshalString(b, p.Linkpath)
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return b, nil
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}
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func (p *sshFxpSymlinkPacket) UnmarshalBinary(b []byte) error {
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var err error
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if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
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return err
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} else if p.Targetpath, b, err = unmarshalStringSafe(b); err != nil {
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return err
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} else if p.Linkpath, _, err = unmarshalStringSafe(b); err != nil {
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return err
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}
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return nil
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}
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type sshFxpReadlinkPacket struct {
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ID uint32
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Path string
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}
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func (p sshFxpReadlinkPacket) id() uint32 { return p.ID }
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func (p sshFxpReadlinkPacket) MarshalBinary() ([]byte, error) {
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return marshalIDString(ssh_FXP_READLINK, p.ID, p.Path)
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}
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func (p *sshFxpReadlinkPacket) UnmarshalBinary(b []byte) error {
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return unmarshalIDString(b, &p.ID, &p.Path)
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}
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type sshFxpRealpathPacket struct {
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ID uint32
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Path string
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}
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func (p sshFxpRealpathPacket) id() uint32 { return p.ID }
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func (p sshFxpRealpathPacket) MarshalBinary() ([]byte, error) {
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return marshalIDString(ssh_FXP_REALPATH, p.ID, p.Path)
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}
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func (p *sshFxpRealpathPacket) UnmarshalBinary(b []byte) error {
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return unmarshalIDString(b, &p.ID, &p.Path)
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}
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type sshFxpNameAttr struct {
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Name string
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LongName string
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Attrs []interface{}
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}
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func (p sshFxpNameAttr) MarshalBinary() ([]byte, error) {
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b := []byte{}
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b = marshalString(b, p.Name)
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b = marshalString(b, p.LongName)
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for _, attr := range p.Attrs {
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b = marshal(b, attr)
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}
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return b, nil
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}
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type sshFxpNamePacket struct {
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ID uint32
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NameAttrs []sshFxpNameAttr
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}
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func (p sshFxpNamePacket) MarshalBinary() ([]byte, error) {
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b := []byte{}
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b = append(b, ssh_FXP_NAME)
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b = marshalUint32(b, p.ID)
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b = marshalUint32(b, uint32(len(p.NameAttrs)))
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for _, na := range p.NameAttrs {
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ab, err := na.MarshalBinary()
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if err != nil {
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return nil, err
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}
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b = append(b, ab...)
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}
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return b, nil
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}
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type sshFxpOpenPacket struct {
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ID uint32
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Path string
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Pflags uint32
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Flags uint32 // ignored
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}
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func (p sshFxpOpenPacket) id() uint32 { return p.ID }
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func (p sshFxpOpenPacket) MarshalBinary() ([]byte, error) {
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l := 1 + 4 +
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4 + len(p.Path) +
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4 + 4
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b := make([]byte, 0, l)
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b = append(b, ssh_FXP_OPEN)
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b = marshalUint32(b, p.ID)
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b = marshalString(b, p.Path)
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b = marshalUint32(b, p.Pflags)
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b = marshalUint32(b, p.Flags)
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return b, nil
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}
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func (p *sshFxpOpenPacket) UnmarshalBinary(b []byte) error {
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var err error
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if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
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return err
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} else if p.Path, b, err = unmarshalStringSafe(b); err != nil {
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return err
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} else if p.Pflags, b, err = unmarshalUint32Safe(b); err != nil {
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return err
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} else if p.Flags, _, err = unmarshalUint32Safe(b); err != nil {
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return err
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}
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return nil
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}
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type sshFxpReadPacket struct {
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ID uint32
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Handle string
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Offset uint64
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Len uint32
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}
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func (p sshFxpReadPacket) id() uint32 { return p.ID }
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func (p sshFxpReadPacket) MarshalBinary() ([]byte, error) {
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l := 1 + 4 + // type(byte) + uint32
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4 + len(p.Handle) +
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8 + 4 // uint64 + uint32
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b := make([]byte, 0, l)
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b = append(b, ssh_FXP_READ)
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b = marshalUint32(b, p.ID)
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b = marshalString(b, p.Handle)
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b = marshalUint64(b, p.Offset)
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b = marshalUint32(b, p.Len)
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return b, nil
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}
|
|
|
|
func (p *sshFxpReadPacket) UnmarshalBinary(b []byte) error {
|
|
var err error
|
|
if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if p.Handle, b, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
} else if p.Offset, b, err = unmarshalUint64Safe(b); err != nil {
|
|
return err
|
|
} else if p.Len, _, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type sshFxpRenamePacket struct {
|
|
ID uint32
|
|
Oldpath string
|
|
Newpath string
|
|
}
|
|
|
|
func (p sshFxpRenamePacket) id() uint32 { return p.ID }
|
|
|
|
func (p sshFxpRenamePacket) MarshalBinary() ([]byte, error) {
|
|
l := 1 + 4 + // type(byte) + uint32
|
|
4 + len(p.Oldpath) +
|
|
4 + len(p.Newpath)
|
|
|
|
b := make([]byte, 0, l)
|
|
b = append(b, ssh_FXP_RENAME)
|
|
b = marshalUint32(b, p.ID)
|
|
b = marshalString(b, p.Oldpath)
|
|
b = marshalString(b, p.Newpath)
|
|
return b, nil
|
|
}
|
|
|
|
func (p *sshFxpRenamePacket) UnmarshalBinary(b []byte) error {
|
|
var err error
|
|
if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if p.Oldpath, b, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
} else if p.Newpath, _, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type sshFxpPosixRenamePacket struct {
|
|
ID uint32
|
|
Oldpath string
|
|
Newpath string
|
|
}
|
|
|
|
func (p sshFxpPosixRenamePacket) id() uint32 { return p.ID }
|
|
|
|
func (p sshFxpPosixRenamePacket) MarshalBinary() ([]byte, error) {
|
|
const ext = "posix-rename@openssh.com"
|
|
l := 1 + 4 + // type(byte) + uint32
|
|
4 + len(ext) +
|
|
4 + len(p.Oldpath) +
|
|
4 + len(p.Newpath)
|
|
|
|
b := make([]byte, 0, l)
|
|
b = append(b, ssh_FXP_EXTENDED)
|
|
b = marshalUint32(b, p.ID)
|
|
b = marshalString(b, ext)
|
|
b = marshalString(b, p.Oldpath)
|
|
b = marshalString(b, p.Newpath)
|
|
return b, nil
|
|
}
|
|
|
|
type sshFxpWritePacket struct {
|
|
ID uint32
|
|
Handle string
|
|
Offset uint64
|
|
Length uint32
|
|
Data []byte
|
|
}
|
|
|
|
func (p sshFxpWritePacket) id() uint32 { return p.ID }
|
|
|
|
func (p sshFxpWritePacket) MarshalBinary() ([]byte, error) {
|
|
l := 1 + 4 + // type(byte) + uint32
|
|
4 + len(p.Handle) +
|
|
8 + 4 + // uint64 + uint32
|
|
len(p.Data)
|
|
|
|
b := make([]byte, 0, l)
|
|
b = append(b, ssh_FXP_WRITE)
|
|
b = marshalUint32(b, p.ID)
|
|
b = marshalString(b, p.Handle)
|
|
b = marshalUint64(b, p.Offset)
|
|
b = marshalUint32(b, p.Length)
|
|
b = append(b, p.Data...)
|
|
return b, nil
|
|
}
|
|
|
|
func (p *sshFxpWritePacket) UnmarshalBinary(b []byte) error {
|
|
var err error
|
|
if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if p.Handle, b, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
} else if p.Offset, b, err = unmarshalUint64Safe(b); err != nil {
|
|
return err
|
|
} else if p.Length, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if uint32(len(b)) < p.Length {
|
|
return errShortPacket
|
|
}
|
|
|
|
p.Data = append([]byte{}, b[:p.Length]...)
|
|
return nil
|
|
}
|
|
|
|
type sshFxpMkdirPacket struct {
|
|
ID uint32
|
|
Path string
|
|
Flags uint32 // ignored
|
|
}
|
|
|
|
func (p sshFxpMkdirPacket) id() uint32 { return p.ID }
|
|
|
|
func (p sshFxpMkdirPacket) MarshalBinary() ([]byte, error) {
|
|
l := 1 + 4 + // type(byte) + uint32
|
|
4 + len(p.Path) +
|
|
4 // uint32
|
|
|
|
b := make([]byte, 0, l)
|
|
b = append(b, ssh_FXP_MKDIR)
|
|
b = marshalUint32(b, p.ID)
|
|
b = marshalString(b, p.Path)
|
|
b = marshalUint32(b, p.Flags)
|
|
return b, nil
|
|
}
|
|
|
|
func (p *sshFxpMkdirPacket) UnmarshalBinary(b []byte) error {
|
|
var err error
|
|
if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if p.Path, b, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
} else if p.Flags, _, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type sshFxpSetstatPacket struct {
|
|
ID uint32
|
|
Path string
|
|
Flags uint32
|
|
Attrs interface{}
|
|
}
|
|
|
|
type sshFxpFsetstatPacket struct {
|
|
ID uint32
|
|
Handle string
|
|
Flags uint32
|
|
Attrs interface{}
|
|
}
|
|
|
|
func (p sshFxpSetstatPacket) id() uint32 { return p.ID }
|
|
func (p sshFxpFsetstatPacket) id() uint32 { return p.ID }
|
|
|
|
func (p sshFxpSetstatPacket) MarshalBinary() ([]byte, error) {
|
|
l := 1 + 4 + // type(byte) + uint32
|
|
4 + len(p.Path) +
|
|
4 // uint32 + uint64
|
|
|
|
b := make([]byte, 0, l)
|
|
b = append(b, ssh_FXP_SETSTAT)
|
|
b = marshalUint32(b, p.ID)
|
|
b = marshalString(b, p.Path)
|
|
b = marshalUint32(b, p.Flags)
|
|
b = marshal(b, p.Attrs)
|
|
return b, nil
|
|
}
|
|
|
|
func (p sshFxpFsetstatPacket) MarshalBinary() ([]byte, error) {
|
|
l := 1 + 4 + // type(byte) + uint32
|
|
4 + len(p.Handle) +
|
|
4 // uint32 + uint64
|
|
|
|
b := make([]byte, 0, l)
|
|
b = append(b, ssh_FXP_FSETSTAT)
|
|
b = marshalUint32(b, p.ID)
|
|
b = marshalString(b, p.Handle)
|
|
b = marshalUint32(b, p.Flags)
|
|
b = marshal(b, p.Attrs)
|
|
return b, nil
|
|
}
|
|
|
|
func (p *sshFxpSetstatPacket) UnmarshalBinary(b []byte) error {
|
|
var err error
|
|
if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if p.Path, b, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
} else if p.Flags, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
}
|
|
p.Attrs = b
|
|
return nil
|
|
}
|
|
|
|
func (p *sshFxpFsetstatPacket) UnmarshalBinary(b []byte) error {
|
|
var err error
|
|
if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if p.Handle, b, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
} else if p.Flags, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
}
|
|
p.Attrs = b
|
|
return nil
|
|
}
|
|
|
|
type sshFxpHandlePacket struct {
|
|
ID uint32
|
|
Handle string
|
|
}
|
|
|
|
func (p sshFxpHandlePacket) MarshalBinary() ([]byte, error) {
|
|
b := []byte{ssh_FXP_HANDLE}
|
|
b = marshalUint32(b, p.ID)
|
|
b = marshalString(b, p.Handle)
|
|
return b, nil
|
|
}
|
|
|
|
type sshFxpStatusPacket struct {
|
|
ID uint32
|
|
StatusError
|
|
}
|
|
|
|
func (p sshFxpStatusPacket) MarshalBinary() ([]byte, error) {
|
|
b := []byte{ssh_FXP_STATUS}
|
|
b = marshalUint32(b, p.ID)
|
|
b = marshalStatus(b, p.StatusError)
|
|
return b, nil
|
|
}
|
|
|
|
type sshFxpDataPacket struct {
|
|
ID uint32
|
|
Length uint32
|
|
Data []byte
|
|
}
|
|
|
|
func (p sshFxpDataPacket) MarshalBinary() ([]byte, error) {
|
|
b := []byte{ssh_FXP_DATA}
|
|
b = marshalUint32(b, p.ID)
|
|
b = marshalUint32(b, p.Length)
|
|
b = append(b, p.Data[:p.Length]...)
|
|
return b, nil
|
|
}
|
|
|
|
func (p *sshFxpDataPacket) UnmarshalBinary(b []byte) error {
|
|
var err error
|
|
if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if p.Length, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if uint32(len(b)) < p.Length {
|
|
return errors.New("truncated packet")
|
|
}
|
|
|
|
p.Data = make([]byte, p.Length)
|
|
copy(p.Data, b)
|
|
return nil
|
|
}
|
|
|
|
type sshFxpStatvfsPacket struct {
|
|
ID uint32
|
|
Path string
|
|
}
|
|
|
|
func (p sshFxpStatvfsPacket) id() uint32 { return p.ID }
|
|
|
|
func (p sshFxpStatvfsPacket) MarshalBinary() ([]byte, error) {
|
|
l := 1 + 4 + // type(byte) + uint32
|
|
len(p.Path) +
|
|
len("statvfs@openssh.com")
|
|
|
|
b := make([]byte, 0, l)
|
|
b = append(b, ssh_FXP_EXTENDED)
|
|
b = marshalUint32(b, p.ID)
|
|
b = marshalString(b, "statvfs@openssh.com")
|
|
b = marshalString(b, p.Path)
|
|
return b, nil
|
|
}
|
|
|
|
// A StatVFS contains statistics about a filesystem.
|
|
type StatVFS struct {
|
|
ID uint32
|
|
Bsize uint64 /* file system block size */
|
|
Frsize uint64 /* fundamental fs block size */
|
|
Blocks uint64 /* number of blocks (unit f_frsize) */
|
|
Bfree uint64 /* free blocks in file system */
|
|
Bavail uint64 /* free blocks for non-root */
|
|
Files uint64 /* total file inodes */
|
|
Ffree uint64 /* free file inodes */
|
|
Favail uint64 /* free file inodes for to non-root */
|
|
Fsid uint64 /* file system id */
|
|
Flag uint64 /* bit mask of f_flag values */
|
|
Namemax uint64 /* maximum filename length */
|
|
}
|
|
|
|
// TotalSpace calculates the amount of total space in a filesystem.
|
|
func (p *StatVFS) TotalSpace() uint64 {
|
|
return p.Frsize * p.Blocks
|
|
}
|
|
|
|
// FreeSpace calculates the amount of free space in a filesystem.
|
|
func (p *StatVFS) FreeSpace() uint64 {
|
|
return p.Frsize * p.Bfree
|
|
}
|
|
|
|
// Convert to ssh_FXP_EXTENDED_REPLY packet binary format
|
|
func (p *StatVFS) MarshalBinary() ([]byte, error) {
|
|
var buf bytes.Buffer
|
|
buf.Write([]byte{ssh_FXP_EXTENDED_REPLY})
|
|
err := binary.Write(&buf, binary.BigEndian, p)
|
|
return buf.Bytes(), err
|
|
}
|
|
|
|
type sshFxpExtendedPacket struct {
|
|
ID uint32
|
|
ExtendedRequest string
|
|
SpecificPacket interface {
|
|
serverRespondablePacket
|
|
readonly() bool
|
|
}
|
|
}
|
|
|
|
func (p sshFxpExtendedPacket) id() uint32 { return p.ID }
|
|
func (p sshFxpExtendedPacket) readonly() bool {
|
|
if p.SpecificPacket == nil {
|
|
return true
|
|
}
|
|
return p.SpecificPacket.readonly()
|
|
}
|
|
|
|
func (p sshFxpExtendedPacket) respond(svr *Server) responsePacket {
|
|
if p.SpecificPacket == nil {
|
|
return statusFromError(p, nil)
|
|
}
|
|
return p.SpecificPacket.respond(svr)
|
|
}
|
|
|
|
func (p *sshFxpExtendedPacket) UnmarshalBinary(b []byte) error {
|
|
var err error
|
|
bOrig := b
|
|
if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if p.ExtendedRequest, _, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
}
|
|
|
|
// specific unmarshalling
|
|
switch p.ExtendedRequest {
|
|
case "statvfs@openssh.com":
|
|
p.SpecificPacket = &sshFxpExtendedPacketStatVFS{}
|
|
case "posix-rename@openssh.com":
|
|
p.SpecificPacket = &sshFxpExtendedPacketPosixRename{}
|
|
default:
|
|
return errors.Wrapf(errUnknownExtendedPacket, "packet type %v", p.SpecificPacket)
|
|
}
|
|
|
|
return p.SpecificPacket.UnmarshalBinary(bOrig)
|
|
}
|
|
|
|
type sshFxpExtendedPacketStatVFS struct {
|
|
ID uint32
|
|
ExtendedRequest string
|
|
Path string
|
|
}
|
|
|
|
func (p sshFxpExtendedPacketStatVFS) id() uint32 { return p.ID }
|
|
func (p sshFxpExtendedPacketStatVFS) readonly() bool { return true }
|
|
func (p *sshFxpExtendedPacketStatVFS) UnmarshalBinary(b []byte) error {
|
|
var err error
|
|
if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if p.ExtendedRequest, b, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
} else if p.Path, _, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type sshFxpExtendedPacketPosixRename struct {
|
|
ID uint32
|
|
ExtendedRequest string
|
|
Oldpath string
|
|
Newpath string
|
|
}
|
|
|
|
func (p sshFxpExtendedPacketPosixRename) id() uint32 { return p.ID }
|
|
func (p sshFxpExtendedPacketPosixRename) readonly() bool { return false }
|
|
func (p *sshFxpExtendedPacketPosixRename) UnmarshalBinary(b []byte) error {
|
|
var err error
|
|
if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
|
|
return err
|
|
} else if p.ExtendedRequest, b, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
} else if p.Oldpath, b, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
} else if p.Newpath, _, err = unmarshalStringSafe(b); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (p sshFxpExtendedPacketPosixRename) respond(s *Server) responsePacket {
|
|
err := os.Rename(p.Oldpath, p.Newpath)
|
|
return statusFromError(p, err)
|
|
}
|