Add vendor files for spf13/viper

vendor/github.com/pkg/errors/LICENSE

@@ -0,0 +1,23 @@
+Copyright (c) 2015, Dave Cheney <dave@cheney.net>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/pkg/errors/errors.go

@@ -0,0 +1,269 @@
+// Package errors provides simple error handling primitives.
+//
+// The traditional error handling idiom in Go is roughly akin to
+//
+//     if err != nil {
+//             return err
+//     }
+//
+// which applied recursively up the call stack results in error reports
+// without context or debugging information. The errors package allows
+// programmers to add context to the failure path in their code in a way
+// that does not destroy the original value of the error.
+//
+// Adding context to an error
+//
+// The errors.Wrap function returns a new error that adds context to the
+// original error by recording a stack trace at the point Wrap is called,
+// and the supplied message. For example
+//
+//     _, err := ioutil.ReadAll(r)
+//     if err != nil {
+//             return errors.Wrap(err, "read failed")
+//     }
+//
+// If additional control is required the errors.WithStack and errors.WithMessage
+// functions destructure errors.Wrap into its component operations of annotating
+// an error with a stack trace and an a message, respectively.
+//
+// Retrieving the cause of an error
+//
+// Using errors.Wrap constructs a stack of errors, adding context to the
+// preceding error. Depending on the nature of the error it may be necessary
+// to reverse the operation of errors.Wrap to retrieve the original error
+// for inspection. Any error value which implements this interface
+//
+//     type causer interface {
+//             Cause() error
+//     }
+//
+// can be inspected by errors.Cause. errors.Cause will recursively retrieve
+// the topmost error which does not implement causer, which is assumed to be
+// the original cause. For example:
+//
+//     switch err := errors.Cause(err).(type) {
+//     case *MyError:
+//             // handle specifically
+//     default:
+//             // unknown error
+//     }
+//
+// causer interface is not exported by this package, but is considered a part
+// of stable public API.
+//
+// Formatted printing of errors
+//
+// All error values returned from this package implement fmt.Formatter and can
+// be formatted by the fmt package. The following verbs are supported
+//
+//     %s    print the error. If the error has a Cause it will be
+//           printed recursively
+//     %v    see %s
+//     %+v   extended format. Each Frame of the error's StackTrace will
+//           be printed in detail.
+//
+// Retrieving the stack trace of an error or wrapper
+//
+// New, Errorf, Wrap, and Wrapf record a stack trace at the point they are
+// invoked. This information can be retrieved with the following interface.
+//
+//     type stackTracer interface {
+//             StackTrace() errors.StackTrace
+//     }
+//
+// Where errors.StackTrace is defined as
+//
+//     type StackTrace []Frame
+//
+// The Frame type represents a call site in the stack trace. Frame supports
+// the fmt.Formatter interface that can be used for printing information about
+// the stack trace of this error. For example:
+//
+//     if err, ok := err.(stackTracer); ok {
+//             for _, f := range err.StackTrace() {
+//                     fmt.Printf("%+s:%d", f)
+//             }
+//     }
+//
+// stackTracer interface is not exported by this package, but is considered a part
+// of stable public API.
+//
+// See the documentation for Frame.Format for more details.
+package errors
+
+import (
+	"fmt"
+	"io"
+)
+
+// New returns an error with the supplied message.
+// New also records the stack trace at the point it was called.
+func New(message string) error {
+	return &fundamental{
+		msg:   message,
+		stack: callers(),
+	}
+}
+
+// Errorf formats according to a format specifier and returns the string
+// as a value that satisfies error.
+// Errorf also records the stack trace at the point it was called.
+func Errorf(format string, args ...interface{}) error {
+	return &fundamental{
+		msg:   fmt.Sprintf(format, args...),
+		stack: callers(),
+	}
+}
+
+// fundamental is an error that has a message and a stack, but no caller.
+type fundamental struct {
+	msg string
+	*stack
+}
+
+func (f *fundamental) Error() string { return f.msg }
+
+func (f *fundamental) Format(s fmt.State, verb rune) {
+	switch verb {
+	case 'v':
+		if s.Flag('+') {
+			io.WriteString(s, f.msg)
+			f.stack.Format(s, verb)
+			return
+		}
+		fallthrough
+	case 's':
+		io.WriteString(s, f.msg)
+	case 'q':
+		fmt.Fprintf(s, "%q", f.msg)
+	}
+}
+
+// WithStack annotates err with a stack trace at the point WithStack was called.
+// If err is nil, WithStack returns nil.
+func WithStack(err error) error {
+	if err == nil {
+		return nil
+	}
+	return &withStack{
+		err,
+		callers(),
+	}
+}
+
+type withStack struct {
+	error
+	*stack
+}
+
+func (w *withStack) Cause() error { return w.error }
+
+func (w *withStack) Format(s fmt.State, verb rune) {
+	switch verb {
+	case 'v':
+		if s.Flag('+') {
+			fmt.Fprintf(s, "%+v", w.Cause())
+			w.stack.Format(s, verb)
+			return
+		}
+		fallthrough
+	case 's':
+		io.WriteString(s, w.Error())
+	case 'q':
+		fmt.Fprintf(s, "%q", w.Error())
+	}
+}
+
+// Wrap returns an error annotating err with a stack trace
+// at the point Wrap is called, and the supplied message.
+// If err is nil, Wrap returns nil.
+func Wrap(err error, message string) error {
+	if err == nil {
+		return nil
+	}
+	err = &withMessage{
+		cause: err,
+		msg:   message,
+	}
+	return &withStack{
+		err,
+		callers(),
+	}
+}
+
+// Wrapf returns an error annotating err with a stack trace
+// at the point Wrapf is call, and the format specifier.
+// If err is nil, Wrapf returns nil.
+func Wrapf(err error, format string, args ...interface{}) error {
+	if err == nil {
+		return nil
+	}
+	err = &withMessage{
+		cause: err,
+		msg:   fmt.Sprintf(format, args...),
+	}
+	return &withStack{
+		err,
+		callers(),
+	}
+}
+
+// WithMessage annotates err with a new message.
+// If err is nil, WithMessage returns nil.
+func WithMessage(err error, message string) error {
+	if err == nil {
+		return nil
+	}
+	return &withMessage{
+		cause: err,
+		msg:   message,
+	}
+}
+
+type withMessage struct {
+	cause error
+	msg   string
+}
+
+func (w *withMessage) Error() string { return w.msg + ": " + w.cause.Error() }
+func (w *withMessage) Cause() error  { return w.cause }
+
+func (w *withMessage) Format(s fmt.State, verb rune) {
+	switch verb {
+	case 'v':
+		if s.Flag('+') {
+			fmt.Fprintf(s, "%+v\n", w.Cause())
+			io.WriteString(s, w.msg)
+			return
+		}
+		fallthrough
+	case 's', 'q':
+		io.WriteString(s, w.Error())
+	}
+}
+
+// Cause returns the underlying cause of the error, if possible.
+// An error value has a cause if it implements the following
+// interface:
+//
+//     type causer interface {
+//            Cause() error
+//     }
+//
+// If the error does not implement Cause, the original error will
+// be returned. If the error is nil, nil will be returned without further
+// investigation.
+func Cause(err error) error {
+	type causer interface {
+		Cause() error
+	}
+
+	for err != nil {
+		cause, ok := err.(causer)
+		if !ok {
+			break
+		}
+		err = cause.Cause()
+	}
+	return err
+}

vendor/github.com/pkg/errors/stack.go

@@ -0,0 +1,147 @@
+package errors
+
+import (
+	"fmt"
+	"io"
+	"path"
+	"runtime"
+	"strings"
+)
+
+// Frame represents a program counter inside a stack frame.
+type Frame uintptr
+
+// pc returns the program counter for this frame;
+// multiple frames may have the same PC value.
+func (f Frame) pc() uintptr { return uintptr(f) - 1 }
+
+// file returns the full path to the file that contains the
+// function for this Frame's pc.
+func (f Frame) file() string {
+	fn := runtime.FuncForPC(f.pc())
+	if fn == nil {
+		return "unknown"
+	}
+	file, _ := fn.FileLine(f.pc())
+	return file
+}
+
+// line returns the line number of source code of the
+// function for this Frame's pc.
+func (f Frame) line() int {
+	fn := runtime.FuncForPC(f.pc())
+	if fn == nil {
+		return 0
+	}
+	_, line := fn.FileLine(f.pc())
+	return line
+}
+
+// Format formats the frame according to the fmt.Formatter interface.
+//
+//    %s    source file
+//    %d    source line
+//    %n    function name
+//    %v    equivalent to %s:%d
+//
+// Format accepts flags that alter the printing of some verbs, as follows:
+//
+//    %+s   function name and path of source file relative to the compile time
+//          GOPATH separated by \n\t (<funcname>\n\t<path>)
+//    %+v   equivalent to %+s:%d
+func (f Frame) Format(s fmt.State, verb rune) {
+	switch verb {
+	case 's':
+		switch {
+		case s.Flag('+'):
+			pc := f.pc()
+			fn := runtime.FuncForPC(pc)
+			if fn == nil {
+				io.WriteString(s, "unknown")
+			} else {
+				file, _ := fn.FileLine(pc)
+				fmt.Fprintf(s, "%s\n\t%s", fn.Name(), file)
+			}
+		default:
+			io.WriteString(s, path.Base(f.file()))
+		}
+	case 'd':
+		fmt.Fprintf(s, "%d", f.line())
+	case 'n':
+		name := runtime.FuncForPC(f.pc()).Name()
+		io.WriteString(s, funcname(name))
+	case 'v':
+		f.Format(s, 's')
+		io.WriteString(s, ":")
+		f.Format(s, 'd')
+	}
+}
+
+// StackTrace is stack of Frames from innermost (newest) to outermost (oldest).
+type StackTrace []Frame
+
+// Format formats the stack of Frames according to the fmt.Formatter interface.
+//
+//    %s	lists source files for each Frame in the stack
+//    %v	lists the source file and line number for each Frame in the stack
+//
+// Format accepts flags that alter the printing of some verbs, as follows:
+//
+//    %+v   Prints filename, function, and line number for each Frame in the stack.
+func (st StackTrace) Format(s fmt.State, verb rune) {
+	switch verb {
+	case 'v':
+		switch {
+		case s.Flag('+'):
+			for _, f := range st {
+				fmt.Fprintf(s, "\n%+v", f)
+			}
+		case s.Flag('#'):
+			fmt.Fprintf(s, "%#v", []Frame(st))
+		default:
+			fmt.Fprintf(s, "%v", []Frame(st))
+		}
+	case 's':
+		fmt.Fprintf(s, "%s", []Frame(st))
+	}
+}
+
+// stack represents a stack of program counters.
+type stack []uintptr
+
+func (s *stack) Format(st fmt.State, verb rune) {
+	switch verb {
+	case 'v':
+		switch {
+		case st.Flag('+'):
+			for _, pc := range *s {
+				f := Frame(pc)
+				fmt.Fprintf(st, "\n%+v", f)
+			}
+		}
+	}
+}
+
+func (s *stack) StackTrace() StackTrace {
+	f := make([]Frame, len(*s))
+	for i := 0; i < len(f); i++ {
+		f[i] = Frame((*s)[i])
+	}
+	return f
+}
+
+func callers() *stack {
+	const depth = 32
+	var pcs [depth]uintptr
+	n := runtime.Callers(3, pcs[:])
+	var st stack = pcs[0:n]
+	return &st
+}
+
+// funcname removes the path prefix component of a function's name reported by func.Name().
+func funcname(name string) string {
+	i := strings.LastIndex(name, "/")
+	name = name[i+1:]
+	i = strings.Index(name, ".")
+	return name[i+1:]
+}

vendor/github.com/pkg/sftp/LICENSE

@@ -0,0 +1,9 @@
+Copyright (c) 2013, Dave Cheney
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/pkg/sftp/attrs.go

@@ -0,0 +1,241 @@
+package sftp
+
+// ssh_FXP_ATTRS support
+// see http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-5
+
+import (
+	"os"
+	"syscall"
+	"time"
+)
+
+const (
+	ssh_FILEXFER_ATTR_SIZE        = 0x00000001
+	ssh_FILEXFER_ATTR_UIDGID      = 0x00000002
+	ssh_FILEXFER_ATTR_PERMISSIONS = 0x00000004
+	ssh_FILEXFER_ATTR_ACMODTIME   = 0x00000008
+	ssh_FILEXFER_ATTR_EXTENDED    = 0x80000000
+)
+
+// fileInfo is an artificial type designed to satisfy os.FileInfo.
+type fileInfo struct {
+	name  string
+	size  int64
+	mode  os.FileMode
+	mtime time.Time
+	sys   interface{}
+}
+
+// Name returns the base name of the file.
+func (fi *fileInfo) Name() string { return fi.name }
+
+// Size returns the length in bytes for regular files; system-dependent for others.
+func (fi *fileInfo) Size() int64 { return fi.size }
+
+// Mode returns file mode bits.
+func (fi *fileInfo) Mode() os.FileMode { return fi.mode }
+
+// ModTime returns the last modification time of the file.
+func (fi *fileInfo) ModTime() time.Time { return fi.mtime }
+
+// IsDir returns true if the file is a directory.
+func (fi *fileInfo) IsDir() bool { return fi.Mode().IsDir() }
+
+func (fi *fileInfo) Sys() interface{} { return fi.sys }
+
+// FileStat holds the original unmarshalled values from a call to READDIR or *STAT.
+// It is exported for the purposes of accessing the raw values via os.FileInfo.Sys()
+type FileStat struct {
+	Size     uint64
+	Mode     uint32
+	Mtime    uint32
+	Atime    uint32
+	UID      uint32
+	GID      uint32
+	Extended []StatExtended
+}
+
+// StatExtended contains additional, extended information for a FileStat.
+type StatExtended struct {
+	ExtType string
+	ExtData string
+}
+
+func fileInfoFromStat(st *FileStat, name string) os.FileInfo {
+	fs := &fileInfo{
+		name:  name,
+		size:  int64(st.Size),
+		mode:  toFileMode(st.Mode),
+		mtime: time.Unix(int64(st.Mtime), 0),
+		sys:   st,
+	}
+	return fs
+}
+
+func fileStatFromInfo(fi os.FileInfo) (uint32, FileStat) {
+	mtime := fi.ModTime().Unix()
+	atime := mtime
+	var flags uint32 = ssh_FILEXFER_ATTR_SIZE |
+		ssh_FILEXFER_ATTR_PERMISSIONS |
+		ssh_FILEXFER_ATTR_ACMODTIME
+
+	fileStat := FileStat{
+		Size:  uint64(fi.Size()),
+		Mode:  fromFileMode(fi.Mode()),
+		Mtime: uint32(mtime),
+		Atime: uint32(atime),
+	}
+
+	// os specific file stat decoding
+	fileStatFromInfoOs(fi, &flags, &fileStat)
+
+	return flags, fileStat
+}
+
+func unmarshalAttrs(b []byte) (*FileStat, []byte) {
+	flags, b := unmarshalUint32(b)
+	return getFileStat(flags, b)
+}
+
+func getFileStat(flags uint32, b []byte) (*FileStat, []byte) {
+	var fs FileStat
+	if flags&ssh_FILEXFER_ATTR_SIZE == ssh_FILEXFER_ATTR_SIZE {
+		fs.Size, b = unmarshalUint64(b)
+	}
+	if flags&ssh_FILEXFER_ATTR_UIDGID == ssh_FILEXFER_ATTR_UIDGID {
+		fs.UID, b = unmarshalUint32(b)
+	}
+	if flags&ssh_FILEXFER_ATTR_UIDGID == ssh_FILEXFER_ATTR_UIDGID {
+		fs.GID, b = unmarshalUint32(b)
+	}
+	if flags&ssh_FILEXFER_ATTR_PERMISSIONS == ssh_FILEXFER_ATTR_PERMISSIONS {
+		fs.Mode, b = unmarshalUint32(b)
+	}
+	if flags&ssh_FILEXFER_ATTR_ACMODTIME == ssh_FILEXFER_ATTR_ACMODTIME {
+		fs.Atime, b = unmarshalUint32(b)
+		fs.Mtime, b = unmarshalUint32(b)
+	}
+	if flags&ssh_FILEXFER_ATTR_EXTENDED == ssh_FILEXFER_ATTR_EXTENDED {
+		var count uint32
+		count, b = unmarshalUint32(b)
+		ext := make([]StatExtended, count)
+		for i := uint32(0); i < count; i++ {
+			var typ string
+			var data string
+			typ, b = unmarshalString(b)
+			data, b = unmarshalString(b)
+			ext[i] = StatExtended{typ, data}
+		}
+		fs.Extended = ext
+	}
+	return &fs, b
+}
+
+func marshalFileInfo(b []byte, fi os.FileInfo) []byte {
+	// attributes variable struct, and also variable per protocol version
+	// spec version 3 attributes:
+	// uint32   flags
+	// uint64   size           present only if flag SSH_FILEXFER_ATTR_SIZE
+	// uint32   uid            present only if flag SSH_FILEXFER_ATTR_UIDGID
+	// uint32   gid            present only if flag SSH_FILEXFER_ATTR_UIDGID
+	// uint32   permissions    present only if flag SSH_FILEXFER_ATTR_PERMISSIONS
+	// uint32   atime          present only if flag SSH_FILEXFER_ACMODTIME
+	// uint32   mtime          present only if flag SSH_FILEXFER_ACMODTIME
+	// uint32   extended_count present only if flag SSH_FILEXFER_ATTR_EXTENDED
+	// string   extended_type
+	// string   extended_data
+	// ...      more extended data (extended_type - extended_data pairs),
+	// 	   so that number of pairs equals extended_count
+
+	flags, fileStat := fileStatFromInfo(fi)
+
+	b = marshalUint32(b, flags)
+	if flags&ssh_FILEXFER_ATTR_SIZE != 0 {
+		b = marshalUint64(b, fileStat.Size)
+	}
+	if flags&ssh_FILEXFER_ATTR_UIDGID != 0 {
+		b = marshalUint32(b, fileStat.UID)
+		b = marshalUint32(b, fileStat.GID)
+	}
+	if flags&ssh_FILEXFER_ATTR_PERMISSIONS != 0 {
+		b = marshalUint32(b, fileStat.Mode)
+	}
+	if flags&ssh_FILEXFER_ATTR_ACMODTIME != 0 {
+		b = marshalUint32(b, fileStat.Atime)
+		b = marshalUint32(b, fileStat.Mtime)
+	}
+
+	return b
+}
+
+// toFileMode converts sftp filemode bits to the os.FileMode specification
+func toFileMode(mode uint32) os.FileMode {
+	var fm = os.FileMode(mode & 0777)
+	switch mode & syscall.S_IFMT {
+	case syscall.S_IFBLK:
+		fm |= os.ModeDevice
+	case syscall.S_IFCHR:
+		fm |= os.ModeDevice | os.ModeCharDevice
+	case syscall.S_IFDIR:
+		fm |= os.ModeDir
+	case syscall.S_IFIFO:
+		fm |= os.ModeNamedPipe
+	case syscall.S_IFLNK:
+		fm |= os.ModeSymlink
+	case syscall.S_IFREG:
+		// nothing to do
+	case syscall.S_IFSOCK:
+		fm |= os.ModeSocket
+	}
+	if mode&syscall.S_ISGID != 0 {
+		fm |= os.ModeSetgid
+	}
+	if mode&syscall.S_ISUID != 0 {
+		fm |= os.ModeSetuid
+	}
+	if mode&syscall.S_ISVTX != 0 {
+		fm |= os.ModeSticky
+	}
+	return fm
+}
+
+// fromFileMode converts from the os.FileMode specification to sftp filemode bits
+func fromFileMode(mode os.FileMode) uint32 {
+	ret := uint32(0)
+
+	if mode&os.ModeDevice != 0 {
+		if mode&os.ModeCharDevice != 0 {
+			ret |= syscall.S_IFCHR
+		} else {
+			ret |= syscall.S_IFBLK
+		}
+	}
+	if mode&os.ModeDir != 0 {
+		ret |= syscall.S_IFDIR
+	}
+	if mode&os.ModeSymlink != 0 {
+		ret |= syscall.S_IFLNK
+	}
+	if mode&os.ModeNamedPipe != 0 {
+		ret |= syscall.S_IFIFO
+	}
+	if mode&os.ModeSetgid != 0 {
+		ret |= syscall.S_ISGID
+	}
+	if mode&os.ModeSetuid != 0 {
+		ret |= syscall.S_ISUID
+	}
+	if mode&os.ModeSticky != 0 {
+		ret |= syscall.S_ISVTX
+	}
+	if mode&os.ModeSocket != 0 {
+		ret |= syscall.S_IFSOCK
+	}
+
+	if mode&os.ModeType == 0 {
+		ret |= syscall.S_IFREG
+	}
+	ret |= uint32(mode & os.ModePerm)
+
+	return ret
+}

vendor/github.com/pkg/sftp/attrs_stubs.go

@@ -0,0 +1,11 @@
+// +build !cgo,!plan9 windows android
+
+package sftp
+
+import (
+	"os"
+)
+
+func fileStatFromInfoOs(fi os.FileInfo, flags *uint32, fileStat *FileStat) {
+	// todo
+}

vendor/github.com/pkg/sftp/attrs_unix.go

@@ -0,0 +1,17 @@
+// +build darwin dragonfly freebsd !android,linux netbsd openbsd solaris
+// +build cgo
+
+package sftp
+
+import (
+	"os"
+	"syscall"
+)
+
+func fileStatFromInfoOs(fi os.FileInfo, flags *uint32, fileStat *FileStat) {
+	if statt, ok := fi.Sys().(*syscall.Stat_t); ok {
+		*flags |= ssh_FILEXFER_ATTR_UIDGID
+		fileStat.UID = statt.Uid
+		fileStat.GID = statt.Gid
+	}
+}

vendor/github.com/pkg/sftp/conn.go

@@ -0,0 +1,133 @@
+package sftp
+
+import (
+	"encoding"
+	"io"
+	"sync"
+
+	"github.com/pkg/errors"
+)
+
+// conn implements a bidirectional channel on which client and server
+// connections are multiplexed.
+type conn struct {
+	io.Reader
+	io.WriteCloser
+	sync.Mutex // used to serialise writes to sendPacket
+	// sendPacketTest is needed to replicate packet issues in testing
+	sendPacketTest func(w io.Writer, m encoding.BinaryMarshaler) error
+}
+
+func (c *conn) recvPacket() (uint8, []byte, error) {
+	return recvPacket(c)
+}
+
+func (c *conn) sendPacket(m encoding.BinaryMarshaler) error {
+	c.Lock()
+	defer c.Unlock()
+	if c.sendPacketTest != nil {
+		return c.sendPacketTest(c, m)
+	}
+	return sendPacket(c, m)
+}
+
+type clientConn struct {
+	conn
+	wg         sync.WaitGroup
+	sync.Mutex                          // protects inflight
+	inflight   map[uint32]chan<- result // outstanding requests
+}
+
+// Close closes the SFTP session.
+func (c *clientConn) Close() error {
+	defer c.wg.Wait()
+	return c.conn.Close()
+}
+
+func (c *clientConn) loop() {
+	defer c.wg.Done()
+	err := c.recv()
+	if err != nil {
+		c.broadcastErr(err)
+	}
+}
+
+// recv continuously reads from the server and forwards responses to the
+// appropriate channel.
+func (c *clientConn) recv() error {
+	defer func() {
+		c.conn.Lock()
+		c.conn.Close()
+		c.conn.Unlock()
+	}()
+	for {
+		typ, data, err := c.recvPacket()
+		if err != nil {
+			return err
+		}
+		sid, _ := unmarshalUint32(data)
+		c.Lock()
+		ch, ok := c.inflight[sid]
+		delete(c.inflight, sid)
+		c.Unlock()
+		if !ok {
+			// This is an unexpected occurrence. Send the error
+			// back to all listeners so that they terminate
+			// gracefully.
+			return errors.Errorf("sid: %v not fond", sid)
+		}
+		ch <- result{typ: typ, data: data}
+	}
+}
+
+// result captures the result of receiving the a packet from the server
+type result struct {
+	typ  byte
+	data []byte
+	err  error
+}
+
+type idmarshaler interface {
+	id() uint32
+	encoding.BinaryMarshaler
+}
+
+func (c *clientConn) sendPacket(p idmarshaler) (byte, []byte, error) {
+	ch := make(chan result, 2)
+	c.dispatchRequest(ch, p)
+	s := <-ch
+	return s.typ, s.data, s.err
+}
+
+func (c *clientConn) dispatchRequest(ch chan<- result, p idmarshaler) {
+	c.Lock()
+	c.inflight[p.id()] = ch
+	c.Unlock()
+	if err := c.conn.sendPacket(p); err != nil {
+		c.Lock()
+		delete(c.inflight, p.id())
+		c.Unlock()
+		ch <- result{err: err}
+	}
+}
+
+// broadcastErr sends an error to all goroutines waiting for a response.
+func (c *clientConn) broadcastErr(err error) {
+	c.Lock()
+	listeners := make([]chan<- result, 0, len(c.inflight))
+	for _, ch := range c.inflight {
+		listeners = append(listeners, ch)
+	}
+	c.Unlock()
+	for _, ch := range listeners {
+		ch <- result{err: err}
+	}
+}
+
+type serverConn struct {
+	conn
+}
+
+func (s *serverConn) sendError(p ider, err error) error {
+	return s.sendPacket(statusFromError(p, err))
+}

vendor/github.com/pkg/sftp/debug.go

@@ -0,0 +1,9 @@
+// +build debug
+
+package sftp
+
+import "log"
+
+func debug(fmt string, args ...interface{}) {
+	log.Printf(fmt, args...)
+}

vendor/github.com/pkg/sftp/examples/buffered-read-benchmark/main.go

@@ -0,0 +1,78 @@
+// buffered-read-benchmark benchmarks the peformance of reading
+// from /dev/zero on the server to a []byte on the client via io.Copy.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"time"
+
+	"golang.org/x/crypto/ssh"
+	"golang.org/x/crypto/ssh/agent"
+
+	"github.com/pkg/sftp"
+)
+
+var (
+	USER = flag.String("user", os.Getenv("USER"), "ssh username")
+	HOST = flag.String("host", "localhost", "ssh server hostname")
+	PORT = flag.Int("port", 22, "ssh server port")
+	PASS = flag.String("pass", os.Getenv("SOCKSIE_SSH_PASSWORD"), "ssh password")
+	SIZE = flag.Int("s", 1<<15, "set max packet size")
+)
+
+func init() {
+	flag.Parse()
+}
+
+func main() {
+	var auths []ssh.AuthMethod
+	if aconn, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK")); err == nil {
+		auths = append(auths, ssh.PublicKeysCallback(agent.NewClient(aconn).Signers))
+
+	}
+	if *PASS != "" {
+		auths = append(auths, ssh.Password(*PASS))
+	}
+
+	config := ssh.ClientConfig{
+		User: *USER,
+		Auth: auths,
+		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
+	}
+	addr := fmt.Sprintf("%s:%d", *HOST, *PORT)
+	conn, err := ssh.Dial("tcp", addr, &config)
+	if err != nil {
+		log.Fatalf("unable to connect to [%s]: %v", addr, err)
+	}
+	defer conn.Close()
+
+	c, err := sftp.NewClient(conn, sftp.MaxPacket(*SIZE))
+	if err != nil {
+		log.Fatalf("unable to start sftp subsytem: %v", err)
+	}
+	defer c.Close()
+
+	r, err := c.Open("/dev/zero")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer r.Close()
+
+	const size = 1e9
+
+	log.Printf("reading %v bytes", size)
+	t1 := time.Now()
+	n, err := io.ReadFull(r, make([]byte, size))
+	if err != nil {
+		log.Fatal(err)
+	}
+	if n != size {
+		log.Fatalf("copy: expected %v bytes, got %d", size, n)
+	}
+	log.Printf("read %v bytes in %s", size, time.Since(t1))
+}

vendor/github.com/pkg/sftp/examples/buffered-write-benchmark/main.go

@@ -0,0 +1,84 @@
+// buffered-write-benchmark benchmarks the peformance of writing
+// a single large []byte on the client to /dev/null on the server via io.Copy.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net"
+	"os"
+	"syscall"
+	"time"
+
+	"golang.org/x/crypto/ssh"
+	"golang.org/x/crypto/ssh/agent"
+
+	"github.com/pkg/sftp"
+)
+
+var (
+	USER = flag.String("user", os.Getenv("USER"), "ssh username")
+	HOST = flag.String("host", "localhost", "ssh server hostname")
+	PORT = flag.Int("port", 22, "ssh server port")
+	PASS = flag.String("pass", os.Getenv("SOCKSIE_SSH_PASSWORD"), "ssh password")
+	SIZE = flag.Int("s", 1<<15, "set max packet size")
+)
+
+func init() {
+	flag.Parse()
+}
+
+func main() {
+	var auths []ssh.AuthMethod
+	if aconn, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK")); err == nil {
+		auths = append(auths, ssh.PublicKeysCallback(agent.NewClient(aconn).Signers))
+
+	}
+	if *PASS != "" {
+		auths = append(auths, ssh.Password(*PASS))
+	}
+
+	config := ssh.ClientConfig{
+		User: *USER,
+		Auth: auths,
+		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
+	}
+	addr := fmt.Sprintf("%s:%d", *HOST, *PORT)
+	conn, err := ssh.Dial("tcp", addr, &config)
+	if err != nil {
+		log.Fatalf("unable to connect to [%s]: %v", addr, err)
+	}
+	defer conn.Close()
+
+	c, err := sftp.NewClient(conn, sftp.MaxPacket(*SIZE))
+	if err != nil {
+		log.Fatalf("unable to start sftp subsytem: %v", err)
+	}
+	defer c.Close()
+
+	w, err := c.OpenFile("/dev/null", syscall.O_WRONLY)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer w.Close()
+
+	f, err := os.Open("/dev/zero")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer f.Close()
+
+	const size = 1e9
+
+	log.Printf("writing %v bytes", size)
+	t1 := time.Now()
+	n, err := w.Write(make([]byte, size))
+	if err != nil {
+		log.Fatal(err)
+	}
+	if n != size {
+		log.Fatalf("copy: expected %v bytes, got %d", size, n)
+	}
+	log.Printf("wrote %v bytes in %s", size, time.Since(t1))
+}

vendor/github.com/pkg/sftp/examples/request-server/main.go

@@ -0,0 +1,131 @@
+// An example SFTP server implementation using the golang SSH package.
+// Serves the whole filesystem visible to the user, and has a hard-coded username and password,
+// so not for real use!
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net"
+	"os"
+
+	"github.com/pkg/sftp"
+	"golang.org/x/crypto/ssh"
+)
+
+// Based on example server code from golang.org/x/crypto/ssh and server_standalone
+func main() {
+
+	var (
+		readOnly    bool
+		debugStderr bool
+	)
+
+	flag.BoolVar(&readOnly, "R", false, "read-only server")
+	flag.BoolVar(&debugStderr, "e", false, "debug to stderr")
+	flag.Parse()
+
+	debugStream := ioutil.Discard
+	if debugStderr {
+		debugStream = os.Stderr
+	}
+
+	// An SSH server is represented by a ServerConfig, which holds
+	// certificate details and handles authentication of ServerConns.
+	config := &ssh.ServerConfig{
+		PasswordCallback: func(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
+			// Should use constant-time compare (or better, salt+hash) in
+			// a production setting.
+			fmt.Fprintf(debugStream, "Login: %s\n", c.User())
+			if c.User() == "testuser" && string(pass) == "tiger" {
+				return nil, nil
+			}
+			return nil, fmt.Errorf("password rejected for %q", c.User())
+		},
+	}
+
+	privateBytes, err := ioutil.ReadFile("id_rsa")
+	if err != nil {
+		log.Fatal("Failed to load private key", err)
+	}
+
+	private, err := ssh.ParsePrivateKey(privateBytes)
+	if err != nil {
+		log.Fatal("Failed to parse private key", err)
+	}
+
+	config.AddHostKey(private)
+
+	// Once a ServerConfig has been configured, connections can be
+	// accepted.
+	listener, err := net.Listen("tcp", "0.0.0.0:2022")
+	if err != nil {
+		log.Fatal("failed to listen for connection", err)
+	}
+	fmt.Printf("Listening on %v\n", listener.Addr())
+
+	nConn, err := listener.Accept()
+	if err != nil {
+		log.Fatal("failed to accept incoming connection", err)
+	}
+
+	// Before use, a handshake must be performed on the incoming net.Conn.
+	sconn, chans, reqs, err := ssh.NewServerConn(nConn, config)
+	if err != nil {
+		log.Fatal("failed to handshake", err)
+	}
+	log.Println("login detected:", sconn.User())
+	fmt.Fprintf(debugStream, "SSH server established\n")
+
+	// The incoming Request channel must be serviced.
+	go ssh.DiscardRequests(reqs)
+
+	// Service the incoming Channel channel.
+	for newChannel := range chans {
+		// Channels have a type, depending on the application level
+		// protocol intended. In the case of an SFTP session, this is "subsystem"
+		// with a payload string of "<length=4>sftp"
+		fmt.Fprintf(debugStream, "Incoming channel: %s\n", newChannel.ChannelType())
+		if newChannel.ChannelType() != "session" {
+			newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
+			fmt.Fprintf(debugStream, "Unknown channel type: %s\n", newChannel.ChannelType())
+			continue
+		}
+		channel, requests, err := newChannel.Accept()
+		if err != nil {
+			log.Fatal("could not accept channel.", err)
+		}
+		fmt.Fprintf(debugStream, "Channel accepted\n")
+
+		// Sessions have out-of-band requests such as "shell",
+		// "pty-req" and "env".  Here we handle only the
+		// "subsystem" request.
+		go func(in <-chan *ssh.Request) {
+			for req := range in {
+				fmt.Fprintf(debugStream, "Request: %v\n", req.Type)
+				ok := false
+				switch req.Type {
+				case "subsystem":
+					fmt.Fprintf(debugStream, "Subsystem: %s\n", req.Payload[4:])
+					if string(req.Payload[4:]) == "sftp" {
+						ok = true
+					}
+				}
+				fmt.Fprintf(debugStream, " - accepted: %v\n", ok)
+				req.Reply(ok, nil)
+			}
+		}(requests)
+
+		root := sftp.InMemHandler()
+		server := sftp.NewRequestServer(channel, root)
+		if err := server.Serve(); err == io.EOF {
+			server.Close()
+			log.Print("sftp client exited session.")
+		} else if err != nil {
+			log.Fatal("sftp server completed with error:", err)
+		}
+	}
+}

vendor/github.com/pkg/sftp/examples/sftp-server/main.go

@@ -0,0 +1,147 @@
+// An example SFTP server implementation using the golang SSH package.
+// Serves the whole filesystem visible to the user, and has a hard-coded username and password,
+// so not for real use!
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net"
+	"os"
+
+	"github.com/pkg/sftp"
+	"golang.org/x/crypto/ssh"
+)
+
+// Based on example server code from golang.org/x/crypto/ssh and server_standalone
+func main() {
+
+	var (
+		readOnly    bool
+		debugStderr bool
+	)
+
+	flag.BoolVar(&readOnly, "R", false, "read-only server")
+	flag.BoolVar(&debugStderr, "e", false, "debug to stderr")
+	flag.Parse()
+
+	debugStream := ioutil.Discard
+	if debugStderr {
+		debugStream = os.Stderr
+	}
+
+	// An SSH server is represented by a ServerConfig, which holds
+	// certificate details and handles authentication of ServerConns.
+	config := &ssh.ServerConfig{
+		PasswordCallback: func(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
+			// Should use constant-time compare (or better, salt+hash) in
+			// a production setting.
+			fmt.Fprintf(debugStream, "Login: %s\n", c.User())
+			if c.User() == "testuser" && string(pass) == "tiger" {
+				return nil, nil
+			}
+			return nil, fmt.Errorf("password rejected for %q", c.User())
+		},
+	}
+
+	privateBytes, err := ioutil.ReadFile("id_rsa")
+	if err != nil {
+		log.Fatal("Failed to load private key", err)
+	}
+
+	private, err := ssh.ParsePrivateKey(privateBytes)
+	if err != nil {
+		log.Fatal("Failed to parse private key", err)
+	}
+
+	config.AddHostKey(private)
+
+	// Once a ServerConfig has been configured, connections can be
+	// accepted.
+	listener, err := net.Listen("tcp", "0.0.0.0:2022")
+	if err != nil {
+		log.Fatal("failed to listen for connection", err)
+	}
+	fmt.Printf("Listening on %v\n", listener.Addr())
+
+	nConn, err := listener.Accept()
+	if err != nil {
+		log.Fatal("failed to accept incoming connection", err)
+	}
+
+	// Before use, a handshake must be performed on the incoming
+	// net.Conn.
+	_, chans, reqs, err := ssh.NewServerConn(nConn, config)
+	if err != nil {
+		log.Fatal("failed to handshake", err)
+	}
+	fmt.Fprintf(debugStream, "SSH server established\n")
+
+	// The incoming Request channel must be serviced.
+	go ssh.DiscardRequests(reqs)
+
+	// Service the incoming Channel channel.
+	for newChannel := range chans {
+		// Channels have a type, depending on the application level
+		// protocol intended. In the case of an SFTP session, this is "subsystem"
+		// with a payload string of "<length=4>sftp"
+		fmt.Fprintf(debugStream, "Incoming channel: %s\n", newChannel.ChannelType())
+		if newChannel.ChannelType() != "session" {
+			newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
+			fmt.Fprintf(debugStream, "Unknown channel type: %s\n", newChannel.ChannelType())
+			continue
+		}
+		channel, requests, err := newChannel.Accept()
+		if err != nil {
+			log.Fatal("could not accept channel.", err)
+		}
+		fmt.Fprintf(debugStream, "Channel accepted\n")
+
+		// Sessions have out-of-band requests such as "shell",
+		// "pty-req" and "env".  Here we handle only the
+		// "subsystem" request.
+		go func(in <-chan *ssh.Request) {
+			for req := range in {
+				fmt.Fprintf(debugStream, "Request: %v\n", req.Type)
+				ok := false
+				switch req.Type {
+				case "subsystem":
+					fmt.Fprintf(debugStream, "Subsystem: %s\n", req.Payload[4:])
+					if string(req.Payload[4:]) == "sftp" {
+						ok = true
+					}
+				}
+				fmt.Fprintf(debugStream, " - accepted: %v\n", ok)
+				req.Reply(ok, nil)
+			}
+		}(requests)
+
+		serverOptions := []sftp.ServerOption{
+			sftp.WithDebug(debugStream),
+		}
+
+		if readOnly {
+			serverOptions = append(serverOptions, sftp.ReadOnly())
+			fmt.Fprintf(debugStream, "Read-only server\n")
+		} else {
+			fmt.Fprintf(debugStream, "Read write server\n")
+		}
+
+		server, err := sftp.NewServer(
+			channel,
+			serverOptions...,
+		)
+		if err != nil {
+			log.Fatal(err)
+		}
+		if err := server.Serve(); err == io.EOF {
+			server.Close()
+			log.Print("sftp client exited session.")
+		} else if err != nil {
+			log.Fatal("sftp server completed with error:", err)
+		}
+	}
+}

vendor/github.com/pkg/sftp/examples/streaming-read-benchmark/main.go

@@ -0,0 +1,85 @@
+// streaming-read-benchmark benchmarks the peformance of reading
+// from /dev/zero on the server to /dev/null on the client via io.Copy.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"syscall"
+	"time"
+
+	"golang.org/x/crypto/ssh"
+	"golang.org/x/crypto/ssh/agent"
+
+	"github.com/pkg/sftp"
+)
+
+var (
+	USER = flag.String("user", os.Getenv("USER"), "ssh username")
+	HOST = flag.String("host", "localhost", "ssh server hostname")
+	PORT = flag.Int("port", 22, "ssh server port")
+	PASS = flag.String("pass", os.Getenv("SOCKSIE_SSH_PASSWORD"), "ssh password")
+	SIZE = flag.Int("s", 1<<15, "set max packet size")
+)
+
+func init() {
+	flag.Parse()
+}
+
+func main() {
+	var auths []ssh.AuthMethod
+	if aconn, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK")); err == nil {
+		auths = append(auths, ssh.PublicKeysCallback(agent.NewClient(aconn).Signers))
+
+	}
+	if *PASS != "" {
+		auths = append(auths, ssh.Password(*PASS))
+	}
+
+	config := ssh.ClientConfig{
+		User: *USER,
+		Auth: auths,
+		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
+	}
+	addr := fmt.Sprintf("%s:%d", *HOST, *PORT)
+	conn, err := ssh.Dial("tcp", addr, &config)
+	if err != nil {
+		log.Fatalf("unable to connect to [%s]: %v", addr, err)
+	}
+	defer conn.Close()
+
+	c, err := sftp.NewClient(conn, sftp.MaxPacket(*SIZE))
+	if err != nil {
+		log.Fatalf("unable to start sftp subsytem: %v", err)
+	}
+	defer c.Close()
+
+	r, err := c.Open("/dev/zero")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer r.Close()
+
+	w, err := os.OpenFile("/dev/null", syscall.O_WRONLY, 0600)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer w.Close()
+
+	const size int64 = 1e9
+
+	log.Printf("reading %v bytes", size)
+	t1 := time.Now()
+	n, err := io.Copy(w, io.LimitReader(r, size))
+	if err != nil {
+		log.Fatal(err)
+	}
+	if n != size {
+		log.Fatalf("copy: expected %v bytes, got %d", size, n)
+	}
+	log.Printf("read %v bytes in %s", size, time.Since(t1))
+}

vendor/github.com/pkg/sftp/examples/streaming-write-benchmark/main.go

@@ -0,0 +1,85 @@
+// streaming-write-benchmark benchmarks the peformance of writing
+// from /dev/zero on the client to /dev/null on the server via io.Copy.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"syscall"
+	"time"
+
+	"golang.org/x/crypto/ssh"
+	"golang.org/x/crypto/ssh/agent"
+
+	"github.com/pkg/sftp"
+)
+
+var (
+	USER = flag.String("user", os.Getenv("USER"), "ssh username")
+	HOST = flag.String("host", "localhost", "ssh server hostname")
+	PORT = flag.Int("port", 22, "ssh server port")
+	PASS = flag.String("pass", os.Getenv("SOCKSIE_SSH_PASSWORD"), "ssh password")
+	SIZE = flag.Int("s", 1<<15, "set max packet size")
+)
+
+func init() {
+	flag.Parse()
+}
+
+func main() {
+	var auths []ssh.AuthMethod
+	if aconn, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK")); err == nil {
+		auths = append(auths, ssh.PublicKeysCallback(agent.NewClient(aconn).Signers))
+
+	}
+	if *PASS != "" {
+		auths = append(auths, ssh.Password(*PASS))
+	}
+
+	config := ssh.ClientConfig{
+		User: *USER,
+		Auth: auths,
+		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
+	}
+	addr := fmt.Sprintf("%s:%d", *HOST, *PORT)
+	conn, err := ssh.Dial("tcp", addr, &config)
+	if err != nil {
+		log.Fatalf("unable to connect to [%s]: %v", addr, err)
+	}
+	defer conn.Close()
+
+	c, err := sftp.NewClient(conn, sftp.MaxPacket(*SIZE))
+	if err != nil {
+		log.Fatalf("unable to start sftp subsytem: %v", err)
+	}
+	defer c.Close()
+
+	w, err := c.OpenFile("/dev/null", syscall.O_WRONLY)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer w.Close()
+
+	f, err := os.Open("/dev/zero")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer f.Close()
+
+	const size int64 = 1e9
+
+	log.Printf("writing %v bytes", size)
+	t1 := time.Now()
+	n, err := io.Copy(w, io.LimitReader(f, size))
+	if err != nil {
+		log.Fatal(err)
+	}
+	if n != size {
+		log.Fatalf("copy: expected %v bytes, got %d", size, n)
+	}
+	log.Printf("wrote %v bytes in %s", size, time.Since(t1))
+}

vendor/github.com/pkg/sftp/match.go

@@ -0,0 +1,295 @@
+package sftp
+
+import (
+	"path"
+	"strings"
+	"unicode/utf8"
+)
+
+// ErrBadPattern indicates a globbing pattern was malformed.
+var ErrBadPattern = path.ErrBadPattern
+
+// Unix separator
+const separator = "/"
+
+// Match reports whether name matches the shell file name pattern.
+// The pattern syntax is:
+//
+//	pattern:
+//		{ term }
+//	term:
+//		'*'         matches any sequence of non-Separator characters
+//		'?'         matches any single non-Separator character
+//		'[' [ '^' ] { character-range } ']'
+//		            character class (must be non-empty)
+//		c           matches character c (c != '*', '?', '\\', '[')
+//		'\\' c      matches character c
+//
+//	character-range:
+//		c           matches character c (c != '\\', '-', ']')
+//		'\\' c      matches character c
+//		lo '-' hi   matches character c for lo <= c <= hi
+//
+// Match requires pattern to match all of name, not just a substring.
+// The only possible returned error is ErrBadPattern, when pattern
+// is malformed.
+//
+//
+func Match(pattern, name string) (matched bool, err error) {
+	return path.Match(pattern, name)
+}
+
+// detect if byte(char) is path separator
+func isPathSeparator(c byte) bool {
+	return string(c) == "/"
+}
+
+// scanChunk gets the next segment of pattern, which is a non-star string
+// possibly preceded by a star.
+func scanChunk(pattern string) (star bool, chunk, rest string) {
+	for len(pattern) > 0 && pattern[0] == '*' {
+		pattern = pattern[1:]
+		star = true
+	}
+	inrange := false
+	var i int
+Scan:
+	for i = 0; i < len(pattern); i++ {
+		switch pattern[i] {
+		case '\\':
+
+			// error check handled in matchChunk: bad pattern.
+			if i+1 < len(pattern) {
+				i++
+			}
+		case '[':
+			inrange = true
+		case ']':
+			inrange = false
+		case '*':
+			if !inrange {
+				break Scan
+			}
+		}
+	}
+	return star, pattern[0:i], pattern[i:]
+}
+
+// matchChunk checks whether chunk matches the beginning of s.
+// If so, it returns the remainder of s (after the match).
+// Chunk is all single-character operators: literals, char classes, and ?.
+func matchChunk(chunk, s string) (rest string, ok bool, err error) {
+	for len(chunk) > 0 {
+		if len(s) == 0 {
+			return
+		}
+		switch chunk[0] {
+		case '[':
+			// character class
+			r, n := utf8.DecodeRuneInString(s)
+			s = s[n:]
+			chunk = chunk[1:]
+			// We can't end right after '[', we're expecting at least
+			// a closing bracket and possibly a caret.
+			if len(chunk) == 0 {
+				err = ErrBadPattern
+				return
+			}
+			// possibly negated
+			negated := chunk[0] == '^'
+			if negated {
+				chunk = chunk[1:]
+			}
+			// parse all ranges
+			match := false
+			nrange := 0
+			for {
+				if len(chunk) > 0 && chunk[0] == ']' && nrange > 0 {
+					chunk = chunk[1:]
+					break
+				}
+				var lo, hi rune
+				if lo, chunk, err = getEsc(chunk); err != nil {
+					return
+				}
+				hi = lo
+				if chunk[0] == '-' {
+					if hi, chunk, err = getEsc(chunk[1:]); err != nil {
+						return
+					}
+				}
+				if lo <= r && r <= hi {
+					match = true
+				}
+				nrange++
+			}
+			if match == negated {
+				return
+			}
+
+		case '?':
+			if isPathSeparator(s[0]) {
+				return
+			}
+			_, n := utf8.DecodeRuneInString(s)
+			s = s[n:]
+			chunk = chunk[1:]
+
+		case '\\':
+			chunk = chunk[1:]
+			if len(chunk) == 0 {
+				err = ErrBadPattern
+				return
+			}
+			fallthrough
+
+		default:
+			if chunk[0] != s[0] {
+				return
+			}
+			s = s[1:]
+			chunk = chunk[1:]
+		}
+	}
+	return s, true, nil
+}
+
+// getEsc gets a possibly-escaped character from chunk, for a character class.
+func getEsc(chunk string) (r rune, nchunk string, err error) {
+	if len(chunk) == 0 || chunk[0] == '-' || chunk[0] == ']' {
+		err = ErrBadPattern
+		return
+	}
+	if chunk[0] == '\\' {
+		chunk = chunk[1:]
+		if len(chunk) == 0 {
+			err = ErrBadPattern
+			return
+		}
+	}
+	r, n := utf8.DecodeRuneInString(chunk)
+	if r == utf8.RuneError && n == 1 {
+		err = ErrBadPattern
+	}
+	nchunk = chunk[n:]
+	if len(nchunk) == 0 {
+		err = ErrBadPattern
+	}
+	return
+}
+
+// Split splits path immediately following the final Separator,
+// separating it into a directory and file name component.
+// If there is no Separator in path, Split returns an empty dir
+// and file set to path.
+// The returned values have the property that path = dir+file.
+func Split(path string) (dir, file string) {
+	i := len(path) - 1
+	for i >= 0 && !isPathSeparator(path[i]) {
+		i--
+	}
+	return path[:i+1], path[i+1:]
+}
+
+// Glob returns the names of all files matching pattern or nil
+// if there is no matching file. The syntax of patterns is the same
+// as in Match. The pattern may describe hierarchical names such as
+// /usr/*/bin/ed (assuming the Separator is '/').
+//
+// Glob ignores file system errors such as I/O errors reading directories.
+// The only possible returned error is ErrBadPattern, when pattern
+// is malformed.
+func (c *Client) Glob(pattern string) (matches []string, err error) {
+	if !hasMeta(pattern) {
+		file, err := c.Lstat(pattern)
+		if err != nil {
+			return nil, nil
+		}
+		dir, _ := Split(pattern)
+		dir = cleanGlobPath(dir)
+		return []string{Join(dir, file.Name())}, nil
+	}
+
+	dir, file := Split(pattern)
+	dir = cleanGlobPath(dir)
+
+	if !hasMeta(dir) {
+		return c.glob(dir, file, nil)
+	}
+
+	// Prevent infinite recursion. See issue 15879.
+	if dir == pattern {
+		return nil, ErrBadPattern
+	}
+
+	var m []string
+	m, err = c.Glob(dir)
+	if err != nil {
+		return
+	}
+	for _, d := range m {
+		matches, err = c.glob(d, file, matches)
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+
+// cleanGlobPath prepares path for glob matching.
+func cleanGlobPath(path string) string {
+	switch path {
+	case "":
+		return "."
+	case string(separator):
+		// do nothing to the path
+		return path
+	default:
+		return path[0 : len(path)-1] // chop off trailing separator
+	}
+}
+
+// glob searches for files matching pattern in the directory dir
+// and appends them to matches. If the directory cannot be
+// opened, it returns the existing matches. New matches are
+// added in lexicographical order.
+func (c *Client) glob(dir, pattern string, matches []string) (m []string, e error) {
+	m = matches
+	fi, err := c.Stat(dir)
+	if err != nil {
+		return
+	}
+	if !fi.IsDir() {
+		return
+	}
+	names, err := c.ReadDir(dir)
+	if err != nil {
+		return
+	}
+	//sort.Strings(names)
+
+	for _, n := range names {
+		matched, err := Match(pattern, n.Name())
+		if err != nil {
+			return m, err
+		}
+		if matched {
+			m = append(m, Join(dir, n.Name()))
+		}
+	}
+	return
+}
+
+// Join joins any number of path elements into a single path, adding
+// a Separator if necessary.
+// all empty strings are ignored.
+func Join(elem ...string) string {
+	return path.Join(elem...)
+}
+
+// hasMeta reports whether path contains any of the magic characters
+// recognized by Match.
+func hasMeta(path string) bool {
+	// TODO(niemeyer): Should other magic characters be added here?
+	return strings.ContainsAny(path, "*?[")
+}

vendor/github.com/pkg/sftp/packet-manager.go

@@ -0,0 +1,173 @@
+package sftp
+
+import (
+	"encoding"
+	"sort"
+	"sync"
+)
+
+// The goal of the packetManager is to keep the outgoing packets in the same
+// order as the incoming. This is due to some sftp clients requiring this
+// behavior (eg. winscp).
+
+type packetSender interface {
+	sendPacket(encoding.BinaryMarshaler) error
+}
+
+type packetManager struct {
+	requests  chan requestPacket
+	responses chan responsePacket
+	fini      chan struct{}
+	incoming  requestPacketIDs
+	outgoing  responsePackets
+	sender    packetSender // connection object
+	working   *sync.WaitGroup
+}
+
+func newPktMgr(sender packetSender) *packetManager {
+	s := &packetManager{
+		requests:  make(chan requestPacket, SftpServerWorkerCount),
+		responses: make(chan responsePacket, SftpServerWorkerCount),
+		fini:      make(chan struct{}),
+		incoming:  make([]uint32, 0, SftpServerWorkerCount),
+		outgoing:  make([]responsePacket, 0, SftpServerWorkerCount),
+		sender:    sender,
+		working:   &sync.WaitGroup{},
+	}
+	go s.controller()
+	return s
+}
+
+type responsePackets []responsePacket
+
+func (r responsePackets) Sort() {
+	sort.Slice(r, func(i, j int) bool {
+		return r[i].id() < r[j].id()
+	})
+}
+
+type requestPacketIDs []uint32
+
+func (r requestPacketIDs) Sort() {
+	sort.Slice(r, func(i, j int) bool {
+		return r[i] < r[j]
+	})
+}
+
+// register incoming packets to be handled
+// send id of 0 for packets without id
+func (s *packetManager) incomingPacket(pkt requestPacket) {
+	s.working.Add(1)
+	s.requests <- pkt // buffer == SftpServerWorkerCount
+}
+
+// register outgoing packets as being ready
+func (s *packetManager) readyPacket(pkt responsePacket) {
+	s.responses <- pkt
+	s.working.Done()
+}
+
+// shut down packetManager controller
+func (s *packetManager) close() {
+	// pause until current packets are processed
+	s.working.Wait()
+	close(s.fini)
+}
+
+// Passed a worker function, returns a channel for incoming packets.
+// The goal is to process packets in the order they are received as is
+// requires by section 7 of the RFC, while maximizing throughput of file
+// transfers.
+func (s *packetManager) workerChan(runWorker func(requestChan)) requestChan {
+
+	rwChan := make(chan requestPacket, SftpServerWorkerCount)
+	for i := 0; i < SftpServerWorkerCount; i++ {
+		runWorker(rwChan)
+	}
+
+	cmdChan := make(chan requestPacket)
+	runWorker(cmdChan)
+
+	pktChan := make(chan requestPacket, SftpServerWorkerCount)
+	go func() {
+		// start with cmdChan
+		curChan := cmdChan
+		for pkt := range pktChan {
+			// on file open packet, switch to rwChan
+			switch pkt.(type) {
+			case *sshFxpOpenPacket:
+				curChan = rwChan
+			// on file close packet, switch back to cmdChan
+			// after waiting for any reads/writes to finish
+			case *sshFxpClosePacket:
+				// wait for rwChan to finish
+				s.working.Wait()
+				// stop using rwChan
+				curChan = cmdChan
+			}
+			s.incomingPacket(pkt)
+			curChan <- pkt
+		}
+		close(rwChan)
+		close(cmdChan)
+		s.close()
+	}()
+
+	return pktChan
+}
+
+// process packets
+func (s *packetManager) controller() {
+	for {
+		select {
+		case pkt := <-s.requests:
+			debug("incoming id: %v", pkt.id())
+			s.incoming = append(s.incoming, pkt.id())
+			if len(s.incoming) > 1 {
+				s.incoming.Sort()
+			}
+		case pkt := <-s.responses:
+			debug("outgoing pkt: %v", pkt.id())
+			s.outgoing = append(s.outgoing, pkt)
+			if len(s.outgoing) > 1 {
+				s.outgoing.Sort()
+			}
+		case <-s.fini:
+			return
+		}
+		s.maybeSendPackets()
+	}
+}
+
+// send as many packets as are ready
+func (s *packetManager) maybeSendPackets() {
+	for {
+		if len(s.outgoing) == 0 || len(s.incoming) == 0 {
+			debug("break! -- outgoing: %v; incoming: %v",
+				len(s.outgoing), len(s.incoming))
+			break
+		}
+		out := s.outgoing[0]
+		in := s.incoming[0]
+		// 		debug("incoming: %v", s.incoming)
+		// 		debug("outgoing: %v", outfilter(s.outgoing))
+		if in == out.id() {
+			s.sender.sendPacket(out)
+			// pop off heads
+			copy(s.incoming, s.incoming[1:])            // shift left
+			s.incoming = s.incoming[:len(s.incoming)-1] // remove last
+			copy(s.outgoing, s.outgoing[1:])            // shift left
+			s.outgoing = s.outgoing[:len(s.outgoing)-1] // remove last
+		} else {
+			break
+		}
+	}
+}
+
+//func outfilter(o []responsePacket) []uint32 {
+//	res := make([]uint32, 0, len(o))
+//	for _, v := range o {
+//		res = append(res, v.id())
+//	}
+//	return res
+//}

vendor/github.com/pkg/sftp/packet-typing.go

@@ -0,0 +1,133 @@
+package sftp
+
+import (
+	"encoding"
+
+	"github.com/pkg/errors"
+)
+
+// all incoming packets
+type requestPacket interface {
+	encoding.BinaryUnmarshaler
+	id() uint32
+}
+
+type requestChan chan requestPacket
+
+type responsePacket interface {
+	encoding.BinaryMarshaler
+	id() uint32
+}
+
+// interfaces to group types
+type hasPath interface {
+	requestPacket
+	getPath() string
+}
+
+type hasHandle interface {
+	requestPacket
+	getHandle() string
+}
+
+type notReadOnly interface {
+	notReadOnly()
+}
+
+//// define types by adding methods
+// hasPath
+func (p sshFxpLstatPacket) getPath() string    { return p.Path }
+func (p sshFxpStatPacket) getPath() string     { return p.Path }
+func (p sshFxpRmdirPacket) getPath() string    { return p.Path }
+func (p sshFxpReadlinkPacket) getPath() string { return p.Path }
+func (p sshFxpRealpathPacket) getPath() string { return p.Path }
+func (p sshFxpMkdirPacket) getPath() string    { return p.Path }
+func (p sshFxpSetstatPacket) getPath() string  { return p.Path }
+func (p sshFxpStatvfsPacket) getPath() string  { return p.Path }
+func (p sshFxpRemovePacket) getPath() string   { return p.Filename }
+func (p sshFxpRenamePacket) getPath() string   { return p.Oldpath }
+func (p sshFxpSymlinkPacket) getPath() string  { return p.Targetpath }
+func (p sshFxpOpendirPacket) getPath() string  { return p.Path }
+func (p sshFxpOpenPacket) getPath() string     { return p.Path }
+
+func (p sshFxpExtendedPacketPosixRename) getPath() string { return p.Oldpath }
+
+// hasHandle
+func (p sshFxpFstatPacket) getHandle() string    { return p.Handle }
+func (p sshFxpFsetstatPacket) getHandle() string { return p.Handle }
+func (p sshFxpReadPacket) getHandle() string     { return p.Handle }
+func (p sshFxpWritePacket) getHandle() string    { return p.Handle }
+func (p sshFxpReaddirPacket) getHandle() string  { return p.Handle }
+func (p sshFxpClosePacket) getHandle() string    { return p.Handle }
+
+// notReadOnly
+func (p sshFxpWritePacket) notReadOnly()               {}
+func (p sshFxpSetstatPacket) notReadOnly()             {}
+func (p sshFxpFsetstatPacket) notReadOnly()            {}
+func (p sshFxpRemovePacket) notReadOnly()              {}
+func (p sshFxpMkdirPacket) notReadOnly()               {}
+func (p sshFxpRmdirPacket) notReadOnly()               {}
+func (p sshFxpRenamePacket) notReadOnly()              {}
+func (p sshFxpSymlinkPacket) notReadOnly()             {}
+func (p sshFxpExtendedPacketPosixRename) notReadOnly() {}
+
+// some packets with ID are missing id()
+func (p sshFxpDataPacket) id() uint32   { return p.ID }
+func (p sshFxpStatusPacket) id() uint32 { return p.ID }
+func (p sshFxpStatResponse) id() uint32 { return p.ID }
+func (p sshFxpNamePacket) id() uint32   { return p.ID }
+func (p sshFxpHandlePacket) id() uint32 { return p.ID }
+func (p sshFxVersionPacket) id() uint32 { return 0 }
+
+// take raw incoming packet data and build packet objects
+func makePacket(p rxPacket) (requestPacket, error) {
+	var pkt requestPacket
+	switch p.pktType {
+	case ssh_FXP_INIT:
+		pkt = &sshFxInitPacket{}
+	case ssh_FXP_LSTAT:
+		pkt = &sshFxpLstatPacket{}
+	case ssh_FXP_OPEN:
+		pkt = &sshFxpOpenPacket{}
+	case ssh_FXP_CLOSE:
+		pkt = &sshFxpClosePacket{}
+	case ssh_FXP_READ:
+		pkt = &sshFxpReadPacket{}
+	case ssh_FXP_WRITE:
+		pkt = &sshFxpWritePacket{}
+	case ssh_FXP_FSTAT:
+		pkt = &sshFxpFstatPacket{}
+	case ssh_FXP_SETSTAT:
+		pkt = &sshFxpSetstatPacket{}
+	case ssh_FXP_FSETSTAT:
+		pkt = &sshFxpFsetstatPacket{}
+	case ssh_FXP_OPENDIR:
+		pkt = &sshFxpOpendirPacket{}
+	case ssh_FXP_READDIR:
+		pkt = &sshFxpReaddirPacket{}
+	case ssh_FXP_REMOVE:
+		pkt = &sshFxpRemovePacket{}
+	case ssh_FXP_MKDIR:
+		pkt = &sshFxpMkdirPacket{}
+	case ssh_FXP_RMDIR:
+		pkt = &sshFxpRmdirPacket{}
+	case ssh_FXP_REALPATH:
+		pkt = &sshFxpRealpathPacket{}
+	case ssh_FXP_STAT:
+		pkt = &sshFxpStatPacket{}
+	case ssh_FXP_RENAME:
+		pkt = &sshFxpRenamePacket{}
+	case ssh_FXP_READLINK:
+		pkt = &sshFxpReadlinkPacket{}
+	case ssh_FXP_SYMLINK:
+		pkt = &sshFxpSymlinkPacket{}
+	case ssh_FXP_EXTENDED:
+		pkt = &sshFxpExtendedPacket{}
+	default:
+		return nil, errors.Errorf("unhandled packet type: %s", p.pktType)
+	}
+	if err := pkt.UnmarshalBinary(p.pktBytes); err != nil {
+		return nil, err
+	}
+	return pkt, nil
+}

vendor/github.com/pkg/sftp/packet.go

@@ -0,0 +1,952 @@
+package sftp
+
+import (
+	"bytes"
+	"encoding"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"os"
+	"reflect"
+
+	"github.com/pkg/errors"
+)
+
+var (
+	errShortPacket           = errors.New("packet too short")
+	errUnknownExtendedPacket = errors.New("unknown extended packet")
+)
+
+const (
+	debugDumpTxPacket      = false
+	debugDumpRxPacket      = false
+	debugDumpTxPacketBytes = false
+	debugDumpRxPacketBytes = false
+)
+
+func marshalUint32(b []byte, v uint32) []byte {
+	return append(b, byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
+}
+
+func marshalUint64(b []byte, v uint64) []byte {
+	return marshalUint32(marshalUint32(b, uint32(v>>32)), uint32(v))
+}
+
+func marshalString(b []byte, v string) []byte {
+	return append(marshalUint32(b, uint32(len(v))), v...)
+}
+
+func marshal(b []byte, v interface{}) []byte {
+	if v == nil {
+		return b
+	}
+	switch v := v.(type) {
+	case uint8:
+		return append(b, v)
+	case uint32:
+		return marshalUint32(b, v)
+	case uint64:
+		return marshalUint64(b, v)
+	case string:
+		return marshalString(b, v)
+	case os.FileInfo:
+		return marshalFileInfo(b, v)
+	default:
+		switch d := reflect.ValueOf(v); d.Kind() {
+		case reflect.Struct:
+			for i, n := 0, d.NumField(); i < n; i++ {
+				b = append(marshal(b, d.Field(i).Interface()))
+			}
+			return b
+		case reflect.Slice:
+			for i, n := 0, d.Len(); i < n; i++ {
+				b = append(marshal(b, d.Index(i).Interface()))
+			}
+			return b
+		default:
+			panic(fmt.Sprintf("marshal(%#v): cannot handle type %T", v, v))
+		}
+	}
+}
+
+func unmarshalUint32(b []byte) (uint32, []byte) {
+	v := uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
+	return v, b[4:]
+}
+
+func unmarshalUint32Safe(b []byte) (uint32, []byte, error) {
+	var v uint32
+	if len(b) < 4 {
+		return 0, nil, errShortPacket
+	}
+	v, b = unmarshalUint32(b)
+	return v, b, nil
+}
+
+func unmarshalUint64(b []byte) (uint64, []byte) {
+	h, b := unmarshalUint32(b)
+	l, b := unmarshalUint32(b)
+	return uint64(h)<<32 | uint64(l), b
+}
+
+func unmarshalUint64Safe(b []byte) (uint64, []byte, error) {
+	var v uint64
+	if len(b) < 8 {
+		return 0, nil, errShortPacket
+	}
+	v, b = unmarshalUint64(b)
+	return v, b, nil
+}
+
+func unmarshalString(b []byte) (string, []byte) {
+	n, b := unmarshalUint32(b)
+	return string(b[:n]), b[n:]
+}
+
+func unmarshalStringSafe(b []byte) (string, []byte, error) {
+	n, b, err := unmarshalUint32Safe(b)
+	if err != nil {
+		return "", nil, err
+	}
+	if int64(n) > int64(len(b)) {
+		return "", nil, errShortPacket
+	}
+	return string(b[:n]), b[n:], nil
+}
+
+// sendPacket marshals p according to RFC 4234.
+func sendPacket(w io.Writer, m encoding.BinaryMarshaler) error {
+	bb, err := m.MarshalBinary()
+	if err != nil {
+		return errors.Errorf("binary marshaller failed: %v", err)
+	}
+	if debugDumpTxPacketBytes {
+		debug("send packet: %s %d bytes %x", fxp(bb[0]), len(bb), bb[1:])
+	} else if debugDumpTxPacket {
+		debug("send packet: %s %d bytes", fxp(bb[0]), len(bb))
+	}
+	l := uint32(len(bb))
+	hdr := []byte{byte(l >> 24), byte(l >> 16), byte(l >> 8), byte(l)}
+	_, err = w.Write(hdr)
+	if err != nil {
+		return errors.Errorf("failed to send packet header: %v", err)
+	}
+	_, err = w.Write(bb)
+	if err != nil {
+		return errors.Errorf("failed to send packet body: %v", err)
+	}
+	return nil
+}
+
+func recvPacket(r io.Reader) (uint8, []byte, error) {
+	var b = []byte{0, 0, 0, 0}
+	if _, err := io.ReadFull(r, b); err != nil {
+		return 0, nil, err
+	}
+	l, _ := unmarshalUint32(b)
+	b = make([]byte, l)
+	if _, err := io.ReadFull(r, b); err != nil {
+		debug("recv packet %d bytes: err %v", l, err)
+		return 0, nil, err
+	}
+	if debugDumpRxPacketBytes {
+		debug("recv packet: %s %d bytes %x", fxp(b[0]), l, b[1:])
+	} else if debugDumpRxPacket {
+		debug("recv packet: %s %d bytes", fxp(b[0]), l)
+	}
+	return b[0], b[1:], nil
+}
+
+type extensionPair struct {
+	Name string
+	Data string
+}
+
+func unmarshalExtensionPair(b []byte) (extensionPair, []byte, error) {
+	var ep extensionPair
+	var err error
+	ep.Name, b, err = unmarshalStringSafe(b)
+	if err != nil {
+		return ep, b, err
+	}
+	ep.Data, b, err = unmarshalStringSafe(b)
+	return ep, b, err
+}
+
+// Here starts the definition of packets along with their MarshalBinary
+// implementations.
+// Manually writing the marshalling logic wins us a lot of time and
+// allocation.
+
+type sshFxInitPacket struct {
+	Version    uint32
+	Extensions []extensionPair
+}
+
+func (p sshFxInitPacket) MarshalBinary() ([]byte, error) {
+	l := 1 + 4 // byte + uint32
+	for _, e := range p.Extensions {
+		l += 4 + len(e.Name) + 4 + len(e.Data)
+	}
+
+	b := make([]byte, 0, l)
+	b = append(b, ssh_FXP_INIT)
+	b = marshalUint32(b, p.Version)
+	for _, e := range p.Extensions {
+		b = marshalString(b, e.Name)
+		b = marshalString(b, e.Data)
+	}
+	return b, nil
+}
+
+func (p *sshFxInitPacket) UnmarshalBinary(b []byte) error {
+	var err error
+	if p.Version, b, err = unmarshalUint32Safe(b); err != nil {
+		return err
+	}
+	for len(b) > 0 {
+		var ep extensionPair
+		ep, b, err = unmarshalExtensionPair(b)
+		if err != nil {
+			return err
+		}
+		p.Extensions = append(p.Extensions, ep)
+	}
+	return nil
+}
+
+type sshFxVersionPacket struct {
+	Version    uint32
+	Extensions []struct {
+		Name, Data string
+	}
+}
+
+func (p sshFxVersionPacket) MarshalBinary() ([]byte, error) {
+	l := 1 + 4 // byte + uint32
+	for _, e := range p.Extensions {
+		l += 4 + len(e.Name) + 4 + len(e.Data)
+	}
+
+	b := make([]byte, 0, l)
+	b = append(b, ssh_FXP_VERSION)
+	b = marshalUint32(b, p.Version)
+	for _, e := range p.Extensions {
+		b = marshalString(b, e.Name)
+		b = marshalString(b, e.Data)
+	}
+	return b, nil
+}
+
+func marshalIDString(packetType byte, id uint32, str string) ([]byte, error) {
+	l := 1 + 4 + // type(byte) + uint32
+		4 + len(str)
+
+	b := make([]byte, 0, l)
+	b = append(b, packetType)
+	b = marshalUint32(b, id)
+	b = marshalString(b, str)
+	return b, nil
+}
+
+func unmarshalIDString(b []byte, id *uint32, str *string) error {
+	var err error
+	*id, b, err = unmarshalUint32Safe(b)
+	if err != nil {
+		return err
+	}
+	*str, _, err = unmarshalStringSafe(b)
+	return err
+}
+
+type sshFxpReaddirPacket struct {
+	ID     uint32
+	Handle string
+}
+
+func (p sshFxpReaddirPacket) id() uint32 { return p.ID }
+
+func (p sshFxpReaddirPacket) MarshalBinary() ([]byte, error) {
+	return marshalIDString(ssh_FXP_READDIR, p.ID, p.Handle)
+}
+
+func (p *sshFxpReaddirPacket) UnmarshalBinary(b []byte) error {
+	return unmarshalIDString(b, &p.ID, &p.Handle)
+}
+
+type sshFxpOpendirPacket struct {
+	ID   uint32
+	Path string
+}
+
+func (p sshFxpOpendirPacket) id() uint32 { return p.ID }
+
+func (p sshFxpOpendirPacket) MarshalBinary() ([]byte, error) {
+	return marshalIDString(ssh_FXP_OPENDIR, p.ID, p.Path)
+}
+
+func (p *sshFxpOpendirPacket) UnmarshalBinary(b []byte) error {
+	return unmarshalIDString(b, &p.ID, &p.Path)
+}
+
+type sshFxpLstatPacket struct {
+	ID   uint32
+	Path string
+}
+
+func (p sshFxpLstatPacket) id() uint32 { return p.ID }
+
+func (p sshFxpLstatPacket) MarshalBinary() ([]byte, error) {
+	return marshalIDString(ssh_FXP_LSTAT, p.ID, p.Path)
+}
+
+func (p *sshFxpLstatPacket) UnmarshalBinary(b []byte) error {
+	return unmarshalIDString(b, &p.ID, &p.Path)
+}
+
+type sshFxpStatPacket struct {
+	ID   uint32
+	Path string
+}
+
+func (p sshFxpStatPacket) id() uint32 { return p.ID }
+
+func (p sshFxpStatPacket) MarshalBinary() ([]byte, error) {
+	return marshalIDString(ssh_FXP_STAT, p.ID, p.Path)
+}
+
+func (p *sshFxpStatPacket) UnmarshalBinary(b []byte) error {
+	return unmarshalIDString(b, &p.ID, &p.Path)
+}
+
+type sshFxpFstatPacket struct {
+	ID     uint32
+	Handle string
+}
+
+func (p sshFxpFstatPacket) id() uint32 { return p.ID }
+
+func (p sshFxpFstatPacket) MarshalBinary() ([]byte, error) {
+	return marshalIDString(ssh_FXP_FSTAT, p.ID, p.Handle)
+}
+
+func (p *sshFxpFstatPacket) UnmarshalBinary(b []byte) error {
+	return unmarshalIDString(b, &p.ID, &p.Handle)
+}
+
+type sshFxpClosePacket struct {
+	ID     uint32
+	Handle string
+}
+
+func (p sshFxpClosePacket) id() uint32 { return p.ID }
+
+func (p sshFxpClosePacket) MarshalBinary() ([]byte, error) {
+	return marshalIDString(ssh_FXP_CLOSE, p.ID, p.Handle)
+}
+
+func (p *sshFxpClosePacket) UnmarshalBinary(b []byte) error {
+	return unmarshalIDString(b, &p.ID, &p.Handle)
+}
+
+type sshFxpRemovePacket struct {
+	ID       uint32
+	Filename string
+}
+
+func (p sshFxpRemovePacket) id() uint32 { return p.ID }
+
+func (p sshFxpRemovePacket) MarshalBinary() ([]byte, error) {
+	return marshalIDString(ssh_FXP_REMOVE, p.ID, p.Filename)
+}
+
+func (p *sshFxpRemovePacket) UnmarshalBinary(b []byte) error {
+	return unmarshalIDString(b, &p.ID, &p.Filename)
+}
+
+type sshFxpRmdirPacket struct {
+	ID   uint32
+	Path string
+}
+
+func (p sshFxpRmdirPacket) id() uint32 { return p.ID }
+
+func (p sshFxpRmdirPacket) MarshalBinary() ([]byte, error) {
+	return marshalIDString(ssh_FXP_RMDIR, p.ID, p.Path)
+}
+
+func (p *sshFxpRmdirPacket) UnmarshalBinary(b []byte) error {
+	return unmarshalIDString(b, &p.ID, &p.Path)
+}
+
+type sshFxpSymlinkPacket struct {
+	ID         uint32
+	Targetpath string
+	Linkpath   string
+}
+
+func (p sshFxpSymlinkPacket) id() uint32 { return p.ID }
+
+func (p sshFxpSymlinkPacket) MarshalBinary() ([]byte, error) {
+	l := 1 + 4 + // type(byte) + uint32
+		4 + len(p.Targetpath) +
+		4 + len(p.Linkpath)
+
+	b := make([]byte, 0, l)
+	b = append(b, ssh_FXP_SYMLINK)
+	b = marshalUint32(b, p.ID)
+	b = marshalString(b, p.Targetpath)
+	b = marshalString(b, p.Linkpath)
+	return b, nil
+}
+
+func (p *sshFxpSymlinkPacket) UnmarshalBinary(b []byte) error {
+	var err error
+	if p.ID, b, err = unmarshalUint32Safe(b); err != nil {
+		return err
+	} else if p.Targetpath, b, err = unmarshalStringSafe(b); err != nil {
+		return err
+	} else if p.Linkpath, _, err = unmarshalStringSafe(b); err != nil {
+		return err
+	}
+	return nil
+}
+
+type sshFxpReadlinkPacket struct {
+	ID   uint32
+	Path string
+}
+
+func (p sshFxpReadlinkPacket) id() uint32 { return p.ID }
+
+func (p sshFxpReadlinkPacket) MarshalBinary() ([]byte, error) {
+	return marshalIDString(ssh_FXP_READLINK, p.ID, p.Path)
+}
+
+func (p *sshFxpReadlinkPacket) UnmarshalBinary(b []byte) error {
+	return unmarshalIDString(b, &p.ID, &p.Path)
+}
+
+type sshFxpRealpathPacket struct {
+	ID   uint32
+	Path string
+}
+
+func (p sshFxpRealpathPacket) id() uint32 { return p.ID }
+
+func (p sshFxpRealpathPacket) MarshalBinary() ([]byte, error) {
+	return marshalIDString(ssh_FXP_REALPATH, p.ID, p.Path)
+}
+
+func (p *sshFxpRealpathPacket) UnmarshalBinary(b []byte) error {
+	return unmarshalIDString(b, &p.ID, &p.Path)
+}
+
+type sshFxpNameAttr struct {
+	Name     string
+	LongName string
+	Attrs    []interface{}
+}
+
+func (p sshFxpNameAttr) MarshalBinary() ([]byte, error) {
+	b := []byte{}
+	b = marshalString(b, p.Name)
+	b = marshalString(b, p.LongName)
+	for _, attr := range p.Attrs {
+		b = marshal(b, attr)
+	}
+	return b, nil
+}
+
+type sshFxpNamePacket struct {
+	ID        uint32
+	NameAttrs []sshFxpNameAttr
+}
+
+func (p sshFxpNamePacket) MarshalBinary() ([]byte, error) {
+	b := []byte{}
+	b = append(b, ssh_FXP_NAME)
+	b = marshalUint32(b, p.ID)
+	b = marshalUint32(b, uint32(len(p.NameAttrs)))
+	for _, na := range p.NameAttrs {
+		ab, err := na.MarshalBinary()
+		if err != nil {
+			return nil, err
+		}
+
+		b = append(b, ab...)
+	}
+	return b, nil
+}
+
+type sshFxpOpenPacket struct {
+	ID     uint32
+	Path   string
+	Pflags uint32
+	Flags  uint32 // ignored
+}
+
+func (p sshFxpOpenPacket) id() uint32 { return p.ID }
+
+func (p sshFxpOpenPacket) MarshalBinary() ([]byte, error) {
+	l := 1 + 4 +
+		4 + len(p.Path) +
+		4 + 4
+
+	b := make([]byte, 0, l)
+	b = append(b, ssh_FXP_OPEN)
+	b = marshalUint32(b, p.ID)
+	b = marshalString(b, p.Path)
+	b = marshalUint32(b, p.Pflags)
+	b = marshalUint32(b, p.Flags)
+	return b, nil
+}
+
+func (p *sshFxpOpenPacket) 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.Pflags, b, err = unmarshalUint32Safe(b); err != nil {
+		return err
+	} else if p.Flags, _, err = unmarshalUint32Safe(b); err != nil {
+		return err
+	}
+	return nil
+}
+
+type sshFxpReadPacket struct {
+	ID     uint32
+	Handle string
+	Offset uint64
+	Len    uint32
+}
+
+func (p sshFxpReadPacket) id() uint32 { return p.ID }
+
+func (p sshFxpReadPacket) MarshalBinary() ([]byte, error) {
+	l := 1 + 4 + // type(byte) + uint32
+		4 + len(p.Handle) +
+		8 + 4 // uint64 + uint32
+
+	b := make([]byte, 0, l)
+	b = append(b, ssh_FXP_READ)
+	b = marshalUint32(b, p.ID)
+	b = marshalString(b, p.Handle)
+	b = marshalUint64(b, p.Offset)
+	b = marshalUint32(b, p.Len)
+	return b, nil
+}
+
+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 { return p.SpecificPacket.readonly() }
+
+func (p sshFxpExtendedPacket) respond(svr *Server) error {
+	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 errUnknownExtendedPacket
+	}
+
+	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) error {
+	err := os.Rename(p.Oldpath, p.Newpath)
+	return s.sendError(p, err)
+}

vendor/github.com/pkg/sftp/release.go

@@ -0,0 +1,5 @@
+// +build !debug
+
+package sftp
+
+func debug(fmt string, args ...interface{}) {}

vendor/github.com/pkg/sftp/request-attrs.go

@@ -0,0 +1,63 @@
+package sftp
+
+// Methods on the Request object to make working with the Flags bitmasks and
+// Attr(ibutes) byte blob easier. Use Pflags() when working with an Open/Write
+// request and AttrFlags() and Attributes() when working with SetStat requests.
+
+import "os"
+
+// Open packet pflags
+type pflags struct {
+	Read, Write, Append, Creat, Trunc, Excl bool
+}
+
+// testable constructor
+func newPflags(flags uint32) pflags {
+	return pflags{
+		Read:   flags&ssh_FXF_READ != 0,
+		Write:  flags&ssh_FXF_WRITE != 0,
+		Append: flags&ssh_FXF_APPEND != 0,
+		Creat:  flags&ssh_FXF_CREAT != 0,
+		Trunc:  flags&ssh_FXF_TRUNC != 0,
+		Excl:   flags&ssh_FXF_EXCL != 0,
+	}
+}
+
+// Check bitmap/uint32 for Open packet pflag values
+func (r *Request) Pflags() pflags {
+	return newPflags(r.Flags)
+}
+
+// File attribute flags
+type aflags struct {
+	Size, UidGid, Permissions, Acmodtime bool
+}
+
+// testable constructor
+func newAflags(flags uint32) aflags {
+	return aflags{
+		Size:        (flags & ssh_FILEXFER_ATTR_SIZE) != 0,
+		UidGid:      (flags & ssh_FILEXFER_ATTR_UIDGID) != 0,
+		Permissions: (flags & ssh_FILEXFER_ATTR_PERMISSIONS) != 0,
+		Acmodtime:   (flags & ssh_FILEXFER_ATTR_ACMODTIME) != 0,
+	}
+}
+
+// Check bitmap/uint32 for file attribute flags
+func (r *Request) AttrFlags(flags uint32) aflags {
+	return newAflags(r.Flags)
+}
+
+// File attributes
+type fileattrs FileStat
+
+// Return Mode wrapped in os.FileMode
+func (a fileattrs) FileMode() os.FileMode {
+	return os.FileMode(a.Mode)
+}
+
+// Parse file attributes byte blob and return them in object
+func (r *Request) Attributes() fileattrs {
+	fa, _ := getFileStat(r.Flags, r.Attrs)
+	return fileattrs(*fa)
+}

vendor/github.com/pkg/sftp/request-errors.go

@@ -0,0 +1,42 @@
+package sftp
+
+// Error types that match the SFTP's SSH_FXP_STATUS codes. Gives you more
+// direct control of the errors being sent vs. letting the library work them
+// out from the standard os/io errors.
+
+type fxerr uint32
+
+const (
+	ErrSshFxOk               = fxerr(ssh_FX_OK)
+	ErrSshFxEof              = fxerr(ssh_FX_EOF)
+	ErrSshFxNoSuchFile       = fxerr(ssh_FX_NO_SUCH_FILE)
+	ErrSshFxPermissionDenied = fxerr(ssh_FX_PERMISSION_DENIED)
+	ErrSshFxFailure          = fxerr(ssh_FX_FAILURE)
+	ErrSshFxBadMessage       = fxerr(ssh_FX_BAD_MESSAGE)
+	ErrSshFxNoConnection     = fxerr(ssh_FX_NO_CONNECTION)
+	ErrSshFxConnectionLost   = fxerr(ssh_FX_CONNECTION_LOST)
+	ErrSshFxOpUnsupported    = fxerr(ssh_FX_OP_UNSUPPORTED)
+)
+
+func (e fxerr) Error() string {
+	switch e {
+	case ErrSshFxOk:
+		return "OK"
+	case ErrSshFxEof:
+		return "EOF"
+	case ErrSshFxNoSuchFile:
+		return "No Such File"
+	case ErrSshFxPermissionDenied:
+		return "Permission Denied"
+	case ErrSshFxBadMessage:
+		return "Bad Message"
+	case ErrSshFxNoConnection:
+		return "No Connection"
+	case ErrSshFxConnectionLost:
+		return "Connection Lost"
+	case ErrSshFxOpUnsupported:
+		return "Operation Unsupported"
+	default:
+		return "Failure"
+	}
+}

vendor/github.com/pkg/sftp/request-example.go

@@ -0,0 +1,261 @@
+package sftp
+
+// This serves as an example of how to implement the request server handler as
+// well as a dummy backend for testing. It implements an in-memory backend that
+// works as a very simple filesystem with simple flat key-value lookup system.
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"sort"
+	"sync"
+	"time"
+)
+
+// InMemHandler returns a Hanlders object with the test handlers
+func InMemHandler() Handlers {
+	root := &root{
+		files: make(map[string]*memFile),
+	}
+	root.memFile = newMemFile("/", true)
+	return Handlers{root, root, root, root}
+}
+
+// Handlers
+func (fs *root) Fileread(r *Request) (io.ReaderAt, error) {
+	if fs.mockErr != nil {
+		return nil, fs.mockErr
+	}
+	fs.filesLock.Lock()
+	defer fs.filesLock.Unlock()
+	file, err := fs.fetch(r.Filepath)
+	if err != nil {
+		return nil, err
+	}
+	if file.symlink != "" {
+		file, err = fs.fetch(file.symlink)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return file.ReaderAt()
+}
+
+func (fs *root) Filewrite(r *Request) (io.WriterAt, error) {
+	if fs.mockErr != nil {
+		return nil, fs.mockErr
+	}
+	fs.filesLock.Lock()
+	defer fs.filesLock.Unlock()
+	file, err := fs.fetch(r.Filepath)
+	if err == os.ErrNotExist {
+		dir, err := fs.fetch(filepath.Dir(r.Filepath))
+		if err != nil {
+			return nil, err
+		}
+		if !dir.isdir {
+			return nil, os.ErrInvalid
+		}
+		file = newMemFile(r.Filepath, false)
+		fs.files[r.Filepath] = file
+	}
+	return file.WriterAt()
+}
+
+func (fs *root) Filecmd(r *Request) error {
+	if fs.mockErr != nil {
+		return fs.mockErr
+	}
+	fs.filesLock.Lock()
+	defer fs.filesLock.Unlock()
+	switch r.Method {
+	case "Setstat":
+		return nil
+	case "Rename":
+		file, err := fs.fetch(r.Filepath)
+		if err != nil {
+			return err
+		}
+		if _, ok := fs.files[r.Target]; ok {
+			return &os.LinkError{Op: "rename", Old: r.Filepath, New: r.Target,
+				Err: fmt.Errorf("dest file exists")}
+		}
+		fs.files[r.Target] = file
+		delete(fs.files, r.Filepath)
+	case "Rmdir", "Remove":
+		_, err := fs.fetch(filepath.Dir(r.Filepath))
+		if err != nil {
+			return err
+		}
+		delete(fs.files, r.Filepath)
+	case "Mkdir":
+		_, err := fs.fetch(filepath.Dir(r.Filepath))
+		if err != nil {
+			return err
+		}
+		fs.files[r.Filepath] = newMemFile(r.Filepath, true)
+	case "Symlink":
+		_, err := fs.fetch(r.Filepath)
+		if err != nil {
+			return err
+		}
+		link := newMemFile(r.Target, false)
+		link.symlink = r.Filepath
+		fs.files[r.Target] = link
+	}
+	return nil
+}
+
+type listerat []os.FileInfo
+
+// Modeled after strings.Reader's ReadAt() implementation
+func (f listerat) ListAt(ls []os.FileInfo, offset int64) (int, error) {
+	var n int
+	if offset >= int64(len(f)) {
+		return 0, io.EOF
+	}
+	n = copy(ls, f[offset:])
+	if n < len(ls) {
+		return n, io.EOF
+	}
+	return n, nil
+}
+
+func (fs *root) Filelist(r *Request) (ListerAt, error) {
+	if fs.mockErr != nil {
+		return nil, fs.mockErr
+	}
+	fs.filesLock.Lock()
+	defer fs.filesLock.Unlock()
+
+	switch r.Method {
+	case "List":
+		ordered_names := []string{}
+		for fn, _ := range fs.files {
+			if filepath.Dir(fn) == r.Filepath {
+				ordered_names = append(ordered_names, fn)
+			}
+		}
+		sort.Strings(ordered_names)
+		list := make([]os.FileInfo, len(ordered_names))
+		for i, fn := range ordered_names {
+			list[i] = fs.files[fn]
+		}
+		return listerat(list), nil
+	case "Stat":
+		file, err := fs.fetch(r.Filepath)
+		if err != nil {
+			return nil, err
+		}
+		return listerat([]os.FileInfo{file}), nil
+	case "Readlink":
+		file, err := fs.fetch(r.Filepath)
+		if err != nil {
+			return nil, err
+		}
+		if file.symlink != "" {
+			file, err = fs.fetch(file.symlink)
+			if err != nil {
+				return nil, err
+			}
+		}
+		return listerat([]os.FileInfo{file}), nil
+	}
+	return nil, nil
+}
+
+// In memory file-system-y thing that the Hanlders live on
+type root struct {
+	*memFile
+	files     map[string]*memFile
+	filesLock sync.Mutex
+	mockErr   error
+}
+
+// Set a mocked error that the next handler call will return.
+// Set to nil to reset for no error.
+func (fs *root) returnErr(err error) {
+	fs.mockErr = err
+}
+
+func (fs *root) fetch(path string) (*memFile, error) {
+	if path == "/" {
+		return fs.memFile, nil
+	}
+	if file, ok := fs.files[path]; ok {
+		return file, nil
+	}
+	return nil, os.ErrNotExist
+}
+
+// Implements os.FileInfo, Reader and Writer interfaces.
+// These are the 3 interfaces necessary for the Handlers.
+type memFile struct {
+	name        string
+	modtime     time.Time
+	symlink     string
+	isdir       bool
+	content     []byte
+	contentLock sync.RWMutex
+}
+
+// factory to make sure modtime is set
+func newMemFile(name string, isdir bool) *memFile {
+	return &memFile{
+		name:    name,
+		modtime: time.Now(),
+		isdir:   isdir,
+	}
+}
+
+// Have memFile fulfill os.FileInfo interface
+func (f *memFile) Name() string { return filepath.Base(f.name) }
+func (f *memFile) Size() int64  { return int64(len(f.content)) }
+func (f *memFile) Mode() os.FileMode {
+	ret := os.FileMode(0644)
+	if f.isdir {
+		ret = os.FileMode(0755) | os.ModeDir
+	}
+	if f.symlink != "" {
+		ret = os.FileMode(0777) | os.ModeSymlink
+	}
+	return ret
+}
+func (f *memFile) ModTime() time.Time { return f.modtime }
+func (f *memFile) IsDir() bool        { return f.isdir }
+func (f *memFile) Sys() interface{} {
+	return fakeFileInfoSys()
+}
+
+// Read/Write
+func (f *memFile) ReaderAt() (io.ReaderAt, error) {
+	if f.isdir {
+		return nil, os.ErrInvalid
+	}
+	return bytes.NewReader(f.content), nil
+}
+
+func (f *memFile) WriterAt() (io.WriterAt, error) {
+	if f.isdir {
+		return nil, os.ErrInvalid
+	}
+	return f, nil
+}
+func (f *memFile) WriteAt(p []byte, off int64) (int, error) {
+	// fmt.Println(string(p), off)
+	// mimic write delays, should be optional
+	time.Sleep(time.Microsecond * time.Duration(len(p)))
+	f.contentLock.Lock()
+	defer f.contentLock.Unlock()
+	plen := len(p) + int(off)
+	if plen >= len(f.content) {
+		nc := make([]byte, plen)
+		copy(nc, f.content)
+		f.content = nc
+	}
+	copy(f.content[off:], p)
+	return len(p), nil
+}

vendor/github.com/pkg/sftp/request-interfaces.go

@@ -0,0 +1,46 @@
+package sftp
+
+import (
+	"io"
+	"os"
+)
+
+// Interfaces are differentiated based on required returned values.
+// All input arguments are to be pulled from Request (the only arg).
+
+// FileReader should return an io.ReaderAt for the filepath
+// Note in cases of an error, the error text will be sent to the client.
+type FileReader interface {
+	Fileread(*Request) (io.ReaderAt, error)
+}
+
+// FileWriter should return an io.WriterAt for the filepath.
+//
+// The request server code will call Close() on the returned io.WriterAt
+// ojbect if an io.Closer type assertion succeeds.
+// Note in cases of an error, the error text will be sent to the client.
+type FileWriter interface {
+	Filewrite(*Request) (io.WriterAt, error)
+}
+
+// FileCmder should return an error
+// Note in cases of an error, the error text will be sent to the client.
+type FileCmder interface {
+	Filecmd(*Request) error
+}
+
+// FileLister should return an object that fulfils the ListerAt interface
+// Note in cases of an error, the error text will be sent to the client.
+type FileLister interface {
+	Filelist(*Request) (ListerAt, error)
+}
+
+// ListerAt does for file lists what io.ReaderAt does for files.
+// ListAt should return the number of entries copied and an io.EOF
+// error if at end of list. This is testable by comparing how many you
+// copied to how many could be copied (eg. n < len(ls) below).
+// The copy() builtin is best for the copying.
+// Note in cases of an error, the error text will be sent to the client.
+type ListerAt interface {
+	ListAt([]os.FileInfo, int64) (int, error)
+}

vendor/github.com/pkg/sftp/request-server.go

@@ -0,0 +1,238 @@
+package sftp
+
+import (
+	"context"
+	"encoding"
+	"io"
+	"path"
+	"path/filepath"
+	"strconv"
+	"sync"
+	"syscall"
+
+	"github.com/pkg/errors"
+)
+
+var maxTxPacket uint32 = 1 << 15
+
+// Handlers contains the 4 SFTP server request handlers.
+type Handlers struct {
+	FileGet  FileReader
+	FilePut  FileWriter
+	FileCmd  FileCmder
+	FileList FileLister
+}
+
+// RequestServer abstracts the sftp protocol with an http request-like protocol
+type RequestServer struct {
+	*serverConn
+	Handlers        Handlers
+	pktMgr          *packetManager
+	openRequests    map[string]*Request
+	openRequestLock sync.RWMutex
+	handleCount     int
+}
+
+// NewRequestServer creates/allocates/returns new RequestServer.
+// Normally there there will be one server per user-session.
+func NewRequestServer(rwc io.ReadWriteCloser, h Handlers) *RequestServer {
+	svrConn := &serverConn{
+		conn: conn{
+			Reader:      rwc,
+			WriteCloser: rwc,
+		},
+	}
+	return &RequestServer{
+		serverConn:   svrConn,
+		Handlers:     h,
+		pktMgr:       newPktMgr(svrConn),
+		openRequests: make(map[string]*Request),
+	}
+}
+
+// New Open packet/Request
+func (rs *RequestServer) nextRequest(r *Request) string {
+	rs.openRequestLock.Lock()
+	defer rs.openRequestLock.Unlock()
+	rs.handleCount++
+	handle := strconv.Itoa(rs.handleCount)
+	rs.openRequests[handle] = r
+	return handle
+}
+
+// Returns Request from openRequests, bool is false if it is missing
+// If the method is different, save/return a new Request w/ that Method.
+//
+// The Requests in openRequests work essentially as open file descriptors that
+// you can do different things with. What you are doing with it are denoted by
+// the first packet of that type (read/write/etc). We create a new Request when
+// it changes to set the request.Method attribute in a thread safe way.
+func (rs *RequestServer) getRequest(handle, method string) (*Request, bool) {
+	rs.openRequestLock.RLock()
+	r, ok := rs.openRequests[handle]
+	rs.openRequestLock.RUnlock()
+	if !ok || r.Method == method {
+		return r, ok
+	}
+	// if we make it here we need to replace the request
+	rs.openRequestLock.Lock()
+	defer rs.openRequestLock.Unlock()
+	r, ok = rs.openRequests[handle]
+	if !ok || r.Method == method { // re-check needed b/c lock race
+		return r, ok
+	}
+	r = r.copy()
+	r.Method = method
+	rs.openRequests[handle] = r
+	return r, ok
+}
+
+func (rs *RequestServer) closeRequest(handle string) error {
+	rs.openRequestLock.Lock()
+	defer rs.openRequestLock.Unlock()
+	if r, ok := rs.openRequests[handle]; ok {
+		delete(rs.openRequests, handle)
+		return r.close()
+	}
+	return syscall.EBADF
+}
+
+// Close the read/write/closer to trigger exiting the main server loop
+func (rs *RequestServer) Close() error { return rs.conn.Close() }
+
+// Serve requests for user session
+func (rs *RequestServer) Serve() error {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	var wg sync.WaitGroup
+	runWorker := func(ch requestChan) {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			if err := rs.packetWorker(ctx, ch); err != nil {
+				rs.conn.Close() // shuts down recvPacket
+			}
+		}()
+	}
+	pktChan := rs.pktMgr.workerChan(runWorker)
+
+	var err error
+	var pkt requestPacket
+	var pktType uint8
+	var pktBytes []byte
+	for {
+		pktType, pktBytes, err = rs.recvPacket()
+		if err != nil {
+			break
+		}
+
+		pkt, err = makePacket(rxPacket{fxp(pktType), pktBytes})
+		if err != nil {
+			debug("makePacket err: %v", err)
+			rs.conn.Close() // shuts down recvPacket
+			break
+		}
+
+		pktChan <- pkt
+	}
+
+	close(pktChan) // shuts down sftpServerWorkers
+	wg.Wait()      // wait for all workers to exit
+
+	// make sure all open requests are properly closed
+	// (eg. possible on dropped connections, client crashes, etc.)
+	for handle, req := range rs.openRequests {
+		delete(rs.openRequests, handle)
+		req.close()
+	}
+
+	return err
+}
+
+func (rs *RequestServer) packetWorker(
+	ctx context.Context, pktChan chan requestPacket,
+) error {
+	for pkt := range pktChan {
+		var rpkt responsePacket
+		switch pkt := pkt.(type) {
+		case *sshFxInitPacket:
+			rpkt = sshFxVersionPacket{sftpProtocolVersion, nil}
+		case *sshFxpClosePacket:
+			handle := pkt.getHandle()
+			rpkt = statusFromError(pkt, rs.closeRequest(handle))
+		case *sshFxpRealpathPacket:
+			rpkt = cleanPacketPath(pkt)
+		case *sshFxpOpendirPacket:
+			request := requestFromPacket(ctx, pkt)
+			handle := rs.nextRequest(request)
+			rpkt = sshFxpHandlePacket{pkt.id(), handle}
+		case *sshFxpOpenPacket:
+			request := requestFromPacket(ctx, pkt)
+			handle := rs.nextRequest(request)
+			rpkt = sshFxpHandlePacket{pkt.id(), handle}
+			if pkt.hasPflags(ssh_FXF_CREAT) {
+				if p := request.call(rs.Handlers, pkt); !isOk(p) {
+					rpkt = p // if error in write, return it
+				}
+			}
+		case hasHandle:
+			handle := pkt.getHandle()
+			request, ok := rs.getRequest(handle, requestMethod(pkt))
+			if !ok {
+				rpkt = statusFromError(pkt, syscall.EBADF)
+			} else {
+				rpkt = request.call(rs.Handlers, pkt)
+			}
+		case hasPath:
+			request := requestFromPacket(ctx, pkt)
+			rpkt = request.call(rs.Handlers, pkt)
+			request.close()
+		default:
+			return errors.Errorf("unexpected packet type %T", pkt)
+		}
+
+		err := rs.sendPacket(rpkt)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// True is responsePacket is an OK status packet
+func isOk(rpkt responsePacket) bool {
+	p, ok := rpkt.(sshFxpStatusPacket)
+	return ok && p.StatusError.Code == ssh_FX_OK
+}
+
+// clean and return name packet for file
+func cleanPacketPath(pkt *sshFxpRealpathPacket) responsePacket {
+	path := cleanPath(pkt.getPath())
+	return &sshFxpNamePacket{
+		ID: pkt.id(),
+		NameAttrs: []sshFxpNameAttr{{
+			Name:     path,
+			LongName: path,
+			Attrs:    emptyFileStat,
+		}},
+	}
+}
+
+// Makes sure we have a clean POSIX (/) absolute path to work with
+func cleanPath(p string) string {
+	p = filepath.ToSlash(p)
+	if !filepath.IsAbs(p) {
+		p = "/" + p
+	}
+	return path.Clean(p)
+}
+
+// Wrap underlying connection methods to use packetManager
+func (rs *RequestServer) sendPacket(m encoding.BinaryMarshaler) error {
+	if pkt, ok := m.(responsePacket); ok {
+		rs.pktMgr.readyPacket(pkt)
+	} else {
+		return errors.Errorf("unexpected packet type %T", m)
+	}
+	return nil
+}

vendor/github.com/pkg/sftp/request-unix.go

@@ -0,0 +1,23 @@
+// +build !windows
+
+package sftp
+
+import (
+	"errors"
+	"syscall"
+)
+
+func fakeFileInfoSys() interface{} {
+	return &syscall.Stat_t{Uid: 65534, Gid: 65534}
+}
+
+func testOsSys(sys interface{}) error {
+	fstat := sys.(*FileStat)
+	if fstat.UID != uint32(65534) {
+		return errors.New("Uid failed to match.")
+	}
+	if fstat.GID != uint32(65534) {
+		return errors.New("Gid failed to match:")
+	}
+	return nil
+}

vendor/github.com/pkg/sftp/request.go

@@ -0,0 +1,353 @@
+package sftp
+
+import (
+	"context"
+	"io"
+	"os"
+	"path"
+	"path/filepath"
+	"sync"
+	"syscall"
+
+	"github.com/pkg/errors"
+)
+
+// MaxFilelist is the max number of files to return in a readdir batch.
+var MaxFilelist int64 = 100
+
+// Request contains the data and state for the incoming service request.
+type Request struct {
+	// Get, Put, Setstat, Stat, Rename, Remove
+	// Rmdir, Mkdir, List, Readlink, Symlink
+	Method   string
+	Filepath string
+	Flags    uint32
+	Attrs    []byte // convert to sub-struct
+	Target   string // for renames and sym-links
+	// reader/writer/readdir from handlers
+	state state
+	// context lasts duration of request
+	ctx       context.Context
+	cancelCtx context.CancelFunc
+}
+
+type state struct {
+	*sync.RWMutex
+	writerAt io.WriterAt
+	readerAt io.ReaderAt
+	listerAt ListerAt
+	lsoffset int64
+}
+
+// New Request initialized based on packet data
+func requestFromPacket(ctx context.Context, pkt hasPath) *Request {
+	method := requestMethod(pkt)
+	request := NewRequest(method, pkt.getPath())
+	request.ctx, request.cancelCtx = context.WithCancel(ctx)
+
+	switch p := pkt.(type) {
+	case *sshFxpOpenPacket:
+		request.Flags = p.Pflags
+	case *sshFxpSetstatPacket:
+		request.Flags = p.Flags
+		request.Attrs = p.Attrs.([]byte)
+	case *sshFxpRenamePacket:
+		request.Target = cleanPath(p.Newpath)
+	case *sshFxpSymlinkPacket:
+		request.Target = cleanPath(p.Linkpath)
+	}
+	return request
+}
+
+// NewRequest creates a new Request object.
+func NewRequest(method, path string) *Request {
+	return &Request{Method: method, Filepath: cleanPath(path),
+		state: state{RWMutex: new(sync.RWMutex)}}
+}
+
+// shallow copy of existing request
+func (r *Request) copy() *Request {
+	r.state.Lock()
+	defer r.state.Unlock()
+	r2 := new(Request)
+	*r2 = *r
+	return r2
+}
+
+// Context returns the request's context. To change the context,
+// use WithContext.
+//
+// The returned context is always non-nil; it defaults to the
+// background context.
+//
+// For incoming server requests, the context is canceled when the
+// request is complete or the client's connection closes.
+func (r *Request) Context() context.Context {
+	if r.ctx != nil {
+		return r.ctx
+	}
+	return context.Background()
+}
+
+// WithContext returns a copy of r with its context changed to ctx.
+// The provided ctx must be non-nil.
+func (r *Request) WithContext(ctx context.Context) *Request {
+	if ctx == nil {
+		panic("nil context")
+	}
+	r2 := r.copy()
+	r2.ctx = ctx
+	r2.cancelCtx = nil
+	return r2
+}
+
+// Returns current offset for file list
+func (r *Request) lsNext() int64 {
+	r.state.RLock()
+	defer r.state.RUnlock()
+	return r.state.lsoffset
+}
+
+// Increases next offset
+func (r *Request) lsInc(offset int64) {
+	r.state.Lock()
+	defer r.state.Unlock()
+	r.state.lsoffset = r.state.lsoffset + offset
+}
+
+// manage file read/write state
+func (r *Request) setWriterState(wa io.WriterAt) {
+	r.state.Lock()
+	defer r.state.Unlock()
+	r.state.writerAt = wa
+}
+func (r *Request) setReaderState(ra io.ReaderAt) {
+	r.state.Lock()
+	defer r.state.Unlock()
+	r.state.readerAt = ra
+}
+func (r *Request) setListerState(la ListerAt) {
+	r.state.Lock()
+	defer r.state.Unlock()
+	r.state.listerAt = la
+}
+
+func (r *Request) getWriter() io.WriterAt {
+	r.state.RLock()
+	defer r.state.RUnlock()
+	return r.state.writerAt
+}
+
+func (r *Request) getReader() io.ReaderAt {
+	r.state.RLock()
+	defer r.state.RUnlock()
+	return r.state.readerAt
+}
+
+func (r *Request) getLister() ListerAt {
+	r.state.RLock()
+	defer r.state.RUnlock()
+	return r.state.listerAt
+}
+
+// Close reader/writer if possible
+func (r *Request) close() error {
+	if r.cancelCtx != nil {
+		r.cancelCtx()
+	}
+	rd := r.getReader()
+	if c, ok := rd.(io.Closer); ok {
+		return c.Close()
+	}
+	wt := r.getWriter()
+	if c, ok := wt.(io.Closer); ok {
+		return c.Close()
+	}
+	return nil
+}
+
+// called from worker to handle packet/request
+func (r *Request) call(handlers Handlers, pkt requestPacket) responsePacket {
+	switch r.Method {
+	case "Get":
+		return fileget(handlers.FileGet, r, pkt)
+	case "Put", "Open":
+		return fileput(handlers.FilePut, r, pkt)
+	case "Setstat", "Rename", "Rmdir", "Mkdir", "Symlink", "Remove":
+		return filecmd(handlers.FileCmd, r, pkt)
+	case "List", "Stat", "Readlink":
+		return filelist(handlers.FileList, r, pkt)
+	default:
+		return statusFromError(pkt,
+			errors.Errorf("unexpected method: %s", r.Method))
+	}
+}
+
+// file data for additional read/write packets
+func packetData(p requestPacket) (data []byte, offset int64, length uint32) {
+	switch p := p.(type) {
+	case *sshFxpReadPacket:
+		length = p.Len
+		offset = int64(p.Offset)
+	case *sshFxpWritePacket:
+		data = p.Data
+		length = p.Length
+		offset = int64(p.Offset)
+	}
+	return
+}
+
+// wrap FileReader handler
+func fileget(h FileReader, r *Request, pkt requestPacket) responsePacket {
+	var err error
+	reader := r.getReader()
+	if reader == nil {
+		reader, err = h.Fileread(r)
+		if err != nil {
+			return statusFromError(pkt, err)
+		}
+		r.setReaderState(reader)
+	}
+
+	_, offset, length := packetData(pkt)
+	data := make([]byte, clamp(length, maxTxPacket))
+	n, err := reader.ReadAt(data, offset)
+	// only return EOF erro if no data left to read
+	if err != nil && (err != io.EOF || n == 0) {
+		return statusFromError(pkt, err)
+	}
+	return &sshFxpDataPacket{
+		ID:     pkt.id(),
+		Length: uint32(n),
+		Data:   data[:n],
+	}
+}
+
+// wrap FileWriter handler
+func fileput(h FileWriter, r *Request, pkt requestPacket) responsePacket {
+	var err error
+	writer := r.getWriter()
+	if writer == nil {
+		writer, err = h.Filewrite(r)
+		if err != nil {
+			return statusFromError(pkt, err)
+		}
+		r.setWriterState(writer)
+	}
+
+	data, offset, _ := packetData(pkt)
+	_, err = writer.WriteAt(data, offset)
+	return statusFromError(pkt, err)
+}
+
+// wrap FileCmder handler
+func filecmd(h FileCmder, r *Request, pkt requestPacket) responsePacket {
+	err := h.Filecmd(r)
+	return statusFromError(pkt, err)
+}
+
+// wrap FileLister handler
+func filelist(h FileLister, r *Request, pkt requestPacket) responsePacket {
+	var err error
+	lister := r.getLister()
+	if lister == nil {
+		lister, err = h.Filelist(r)
+		if err != nil {
+			return statusFromError(pkt, err)
+		}
+		r.setListerState(lister)
+	}
+
+	offset := r.lsNext()
+	finfo := make([]os.FileInfo, MaxFilelist)
+	n, err := lister.ListAt(finfo, offset)
+	r.lsInc(int64(n))
+	// ignore EOF as we only return it when there are no results
+	finfo = finfo[:n] // avoid need for nil tests below
+
+	switch r.Method {
+	case "List":
+		if err != nil && err != io.EOF {
+			return statusFromError(pkt, err)
+		}
+		if n == 0 {
+			return statusFromError(pkt, io.EOF)
+		}
+		dirname := filepath.ToSlash(path.Base(r.Filepath))
+		ret := &sshFxpNamePacket{ID: pkt.id()}
+
+		for _, fi := range finfo {
+			ret.NameAttrs = append(ret.NameAttrs, sshFxpNameAttr{
+				Name:     fi.Name(),
+				LongName: runLs(dirname, fi),
+				Attrs:    []interface{}{fi},
+			})
+		}
+		return ret
+	case "Stat":
+		if err != nil && err != io.EOF {
+			return statusFromError(pkt, err)
+		}
+		if n == 0 {
+			err = &os.PathError{Op: "stat", Path: r.Filepath,
+				Err: syscall.ENOENT}
+			return statusFromError(pkt, err)
+		}
+		return &sshFxpStatResponse{
+			ID:   pkt.id(),
+			info: finfo[0],
+		}
+	case "Readlink":
+		if err != nil && err != io.EOF {
+			return statusFromError(pkt, err)
+		}
+		if n == 0 {
+			err = &os.PathError{Op: "readlink", Path: r.Filepath,
+				Err: syscall.ENOENT}
+			return statusFromError(pkt, err)
+		}
+		filename := finfo[0].Name()
+		return &sshFxpNamePacket{
+			ID: pkt.id(),
+			NameAttrs: []sshFxpNameAttr{{
+				Name:     filename,
+				LongName: filename,
+				Attrs:    emptyFileStat,
+			}},
+		}
+	default:
+		err = errors.Errorf("unexpected method: %s", r.Method)
+		return statusFromError(pkt, err)
+	}
+}
+
+// init attributes of request object from packet data
+func requestMethod(p requestPacket) (method string) {
+	switch p.(type) {
+	case *sshFxpReadPacket:
+		method = "Get"
+	case *sshFxpWritePacket:
+		method = "Put"
+	case *sshFxpReaddirPacket:
+		method = "List"
+	case *sshFxpOpenPacket, *sshFxpOpendirPacket:
+		method = "Open"
+	case *sshFxpSetstatPacket, *sshFxpFsetstatPacket:
+		method = "Setstat"
+	case *sshFxpRenamePacket:
+		method = "Rename"
+	case *sshFxpSymlinkPacket:
+		method = "Symlink"
+	case *sshFxpRemovePacket:
+		method = "Remove"
+	case *sshFxpStatPacket, *sshFxpLstatPacket, *sshFxpFstatPacket:
+		method = "Stat"
+	case *sshFxpRmdirPacket:
+		method = "Rmdir"
+	case *sshFxpReadlinkPacket:
+		method = "Readlink"
+	case *sshFxpMkdirPacket:
+		method = "Mkdir"
+	}
+	return method
+}

vendor/github.com/pkg/sftp/request_windows.go

@@ -0,0 +1,11 @@
+package sftp
+
+import "syscall"
+
+func fakeFileInfoSys() interface{} {
+	return syscall.Win32FileAttributeData{}
+}
+
+func testOsSys(sys interface{}) error {
+	return nil
+}

vendor/github.com/pkg/sftp/server.go

@@ -0,0 +1,675 @@
+package sftp
+
+// sftp server counterpart
+
+import (
+	"encoding"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+const (
+	SftpServerWorkerCount = 8
+)
+
+// Server is an SSH File Transfer Protocol (sftp) server.
+// This is intended to provide the sftp subsystem to an ssh server daemon.
+// This implementation currently supports most of sftp server protocol version 3,
+// as specified at http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02
+type Server struct {
+	*serverConn
+	debugStream   io.Writer
+	readOnly      bool
+	pktMgr        *packetManager
+	openFiles     map[string]*os.File
+	openFilesLock sync.RWMutex
+	handleCount   int
+	maxTxPacket   uint32
+}
+
+func (svr *Server) nextHandle(f *os.File) string {
+	svr.openFilesLock.Lock()
+	defer svr.openFilesLock.Unlock()
+	svr.handleCount++
+	handle := strconv.Itoa(svr.handleCount)
+	svr.openFiles[handle] = f
+	return handle
+}
+
+func (svr *Server) closeHandle(handle string) error {
+	svr.openFilesLock.Lock()
+	defer svr.openFilesLock.Unlock()
+	if f, ok := svr.openFiles[handle]; ok {
+		delete(svr.openFiles, handle)
+		return f.Close()
+	}
+
+	return syscall.EBADF
+}
+
+func (svr *Server) getHandle(handle string) (*os.File, bool) {
+	svr.openFilesLock.RLock()
+	defer svr.openFilesLock.RUnlock()
+	f, ok := svr.openFiles[handle]
+	return f, ok
+}
+
+type serverRespondablePacket interface {
+	encoding.BinaryUnmarshaler
+	id() uint32
+	respond(svr *Server) error
+}
+
+// NewServer creates a new Server instance around the provided streams, serving
+// content from the root of the filesystem.  Optionally, ServerOption
+// functions may be specified to further configure the Server.
+//
+// A subsequent call to Serve() is required to begin serving files over SFTP.
+func NewServer(rwc io.ReadWriteCloser, options ...ServerOption) (*Server, error) {
+	svrConn := &serverConn{
+		conn: conn{
+			Reader:      rwc,
+			WriteCloser: rwc,
+		},
+	}
+	s := &Server{
+		serverConn:  svrConn,
+		debugStream: ioutil.Discard,
+		pktMgr:      newPktMgr(svrConn),
+		openFiles:   make(map[string]*os.File),
+		maxTxPacket: 1 << 15,
+	}
+
+	for _, o := range options {
+		if err := o(s); err != nil {
+			return nil, err
+		}
+	}
+
+	return s, nil
+}
+
+// A ServerOption is a function which applies configuration to a Server.
+type ServerOption func(*Server) error
+
+// WithDebug enables Server debugging output to the supplied io.Writer.
+func WithDebug(w io.Writer) ServerOption {
+	return func(s *Server) error {
+		s.debugStream = w
+		return nil
+	}
+}
+
+// ReadOnly configures a Server to serve files in read-only mode.
+func ReadOnly() ServerOption {
+	return func(s *Server) error {
+		s.readOnly = true
+		return nil
+	}
+}
+
+type rxPacket struct {
+	pktType  fxp
+	pktBytes []byte
+}
+
+// Up to N parallel servers
+func (svr *Server) sftpServerWorker(pktChan chan requestPacket) error {
+	for pkt := range pktChan {
+
+		// readonly checks
+		readonly := true
+		switch pkt := pkt.(type) {
+		case notReadOnly:
+			readonly = false
+		case *sshFxpOpenPacket:
+			readonly = pkt.readonly()
+		case *sshFxpExtendedPacket:
+			readonly = pkt.SpecificPacket.readonly()
+		}
+
+		// If server is operating read-only and a write operation is requested,
+		// return permission denied
+		if !readonly && svr.readOnly {
+			if err := svr.sendError(pkt, syscall.EPERM); err != nil {
+				return errors.Wrap(err, "failed to send read only packet response")
+			}
+			continue
+		}
+
+		if err := handlePacket(svr, pkt); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func handlePacket(s *Server, p interface{}) error {
+	switch p := p.(type) {
+	case *sshFxInitPacket:
+		return s.sendPacket(sshFxVersionPacket{sftpProtocolVersion, nil})
+	case *sshFxpStatPacket:
+		// stat the requested file
+		info, err := os.Stat(p.Path)
+		if err != nil {
+			return s.sendError(p, err)
+		}
+		return s.sendPacket(sshFxpStatResponse{
+			ID:   p.ID,
+			info: info,
+		})
+	case *sshFxpLstatPacket:
+		// stat the requested file
+		info, err := os.Lstat(p.Path)
+		if err != nil {
+			return s.sendError(p, err)
+		}
+		return s.sendPacket(sshFxpStatResponse{
+			ID:   p.ID,
+			info: info,
+		})
+	case *sshFxpFstatPacket:
+		f, ok := s.getHandle(p.Handle)
+		if !ok {
+			return s.sendError(p, syscall.EBADF)
+		}
+
+		info, err := f.Stat()
+		if err != nil {
+			return s.sendError(p, err)
+		}
+
+		return s.sendPacket(sshFxpStatResponse{
+			ID:   p.ID,
+			info: info,
+		})
+	case *sshFxpMkdirPacket:
+		// TODO FIXME: ignore flags field
+		err := os.Mkdir(p.Path, 0755)
+		return s.sendError(p, err)
+	case *sshFxpRmdirPacket:
+		err := os.Remove(p.Path)
+		return s.sendError(p, err)
+	case *sshFxpRemovePacket:
+		err := os.Remove(p.Filename)
+		return s.sendError(p, err)
+	case *sshFxpRenamePacket:
+		err := os.Rename(p.Oldpath, p.Newpath)
+		return s.sendError(p, err)
+	case *sshFxpSymlinkPacket:
+		err := os.Symlink(p.Targetpath, p.Linkpath)
+		return s.sendError(p, err)
+	case *sshFxpClosePacket:
+		return s.sendError(p, s.closeHandle(p.Handle))
+	case *sshFxpReadlinkPacket:
+		f, err := os.Readlink(p.Path)
+		if err != nil {
+			return s.sendError(p, err)
+		}
+
+		return s.sendPacket(sshFxpNamePacket{
+			ID: p.ID,
+			NameAttrs: []sshFxpNameAttr{{
+				Name:     f,
+				LongName: f,
+				Attrs:    emptyFileStat,
+			}},
+		})
+
+	case *sshFxpRealpathPacket:
+		f, err := filepath.Abs(p.Path)
+		if err != nil {
+			return s.sendError(p, err)
+		}
+		f = cleanPath(f)
+		return s.sendPacket(sshFxpNamePacket{
+			ID: p.ID,
+			NameAttrs: []sshFxpNameAttr{{
+				Name:     f,
+				LongName: f,
+				Attrs:    emptyFileStat,
+			}},
+		})
+	case *sshFxpOpendirPacket:
+		return sshFxpOpenPacket{
+			ID:     p.ID,
+			Path:   p.Path,
+			Pflags: ssh_FXF_READ,
+		}.respond(s)
+	case *sshFxpReadPacket:
+		f, ok := s.getHandle(p.Handle)
+		if !ok {
+			return s.sendError(p, syscall.EBADF)
+		}
+
+		data := make([]byte, clamp(p.Len, s.maxTxPacket))
+		n, err := f.ReadAt(data, int64(p.Offset))
+		if err != nil && (err != io.EOF || n == 0) {
+			return s.sendError(p, err)
+		}
+		return s.sendPacket(sshFxpDataPacket{
+			ID:     p.ID,
+			Length: uint32(n),
+			Data:   data[:n],
+		})
+	case *sshFxpWritePacket:
+		f, ok := s.getHandle(p.Handle)
+		if !ok {
+			return s.sendError(p, syscall.EBADF)
+		}
+
+		_, err := f.WriteAt(p.Data, int64(p.Offset))
+		return s.sendError(p, err)
+	case serverRespondablePacket:
+		err := p.respond(s)
+		return errors.Wrap(err, "pkt.respond failed")
+	default:
+		return errors.Errorf("unexpected packet type %T", p)
+	}
+}
+
+// Serve serves SFTP connections until the streams stop or the SFTP subsystem
+// is stopped.
+func (svr *Server) Serve() error {
+	var wg sync.WaitGroup
+	runWorker := func(ch requestChan) {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			if err := svr.sftpServerWorker(ch); err != nil {
+				svr.conn.Close() // shuts down recvPacket
+			}
+		}()
+	}
+	pktChan := svr.pktMgr.workerChan(runWorker)
+
+	var err error
+	var pkt requestPacket
+	var pktType uint8
+	var pktBytes []byte
+	for {
+		pktType, pktBytes, err = svr.recvPacket()
+		if err != nil {
+			break
+		}
+
+		pkt, err = makePacket(rxPacket{fxp(pktType), pktBytes})
+		if err != nil {
+			debug("makePacket err: %v", err)
+			svr.conn.Close() // shuts down recvPacket
+			break
+		}
+
+		pktChan <- pkt
+	}
+
+	close(pktChan) // shuts down sftpServerWorkers
+	wg.Wait()      // wait for all workers to exit
+
+	// close any still-open files
+	for handle, file := range svr.openFiles {
+		fmt.Fprintf(svr.debugStream, "sftp server file with handle %q left open: %v\n", handle, file.Name())
+		file.Close()
+	}
+	return err // error from recvPacket
+}
+
+// Wrap underlying connection methods to use packetManager
+func (svr *Server) sendPacket(m encoding.BinaryMarshaler) error {
+	if pkt, ok := m.(responsePacket); ok {
+		svr.pktMgr.readyPacket(pkt)
+	} else {
+		return errors.Errorf("unexpected packet type %T", m)
+	}
+	return nil
+}
+
+func (svr *Server) sendError(p ider, err error) error {
+	return svr.sendPacket(statusFromError(p, err))
+}
+
+type ider interface {
+	id() uint32
+}
+
+// The init packet has no ID, so we just return a zero-value ID
+func (p sshFxInitPacket) id() uint32 { return 0 }
+
+type sshFxpStatResponse struct {
+	ID   uint32
+	info os.FileInfo
+}
+
+func (p sshFxpStatResponse) MarshalBinary() ([]byte, error) {
+	b := []byte{ssh_FXP_ATTRS}
+	b = marshalUint32(b, p.ID)
+	b = marshalFileInfo(b, p.info)
+	return b, nil
+}
+
+var emptyFileStat = []interface{}{uint32(0)}
+
+func (p sshFxpOpenPacket) readonly() bool {
+	return !p.hasPflags(ssh_FXF_WRITE)
+}
+
+func (p sshFxpOpenPacket) hasPflags(flags ...uint32) bool {
+	for _, f := range flags {
+		if p.Pflags&f == 0 {
+			return false
+		}
+	}
+	return true
+}
+
+func (p sshFxpOpenPacket) respond(svr *Server) error {
+	var osFlags int
+	if p.hasPflags(ssh_FXF_READ, ssh_FXF_WRITE) {
+		osFlags |= os.O_RDWR
+	} else if p.hasPflags(ssh_FXF_WRITE) {
+		osFlags |= os.O_WRONLY
+	} else if p.hasPflags(ssh_FXF_READ) {
+		osFlags |= os.O_RDONLY
+	} else {
+		// how are they opening?
+		return svr.sendError(p, syscall.EINVAL)
+	}
+
+	if p.hasPflags(ssh_FXF_APPEND) {
+		osFlags |= os.O_APPEND
+	}
+	if p.hasPflags(ssh_FXF_CREAT) {
+		osFlags |= os.O_CREATE
+	}
+	if p.hasPflags(ssh_FXF_TRUNC) {
+		osFlags |= os.O_TRUNC
+	}
+	if p.hasPflags(ssh_FXF_EXCL) {
+		osFlags |= os.O_EXCL
+	}
+
+	f, err := os.OpenFile(p.Path, osFlags, 0644)
+	if err != nil {
+		return svr.sendError(p, err)
+	}
+
+	handle := svr.nextHandle(f)
+	return svr.sendPacket(sshFxpHandlePacket{p.ID, handle})
+}
+
+func (p sshFxpReaddirPacket) respond(svr *Server) error {
+	f, ok := svr.getHandle(p.Handle)
+	if !ok {
+		return svr.sendError(p, syscall.EBADF)
+	}
+
+	dirname := f.Name()
+	dirents, err := f.Readdir(128)
+	if err != nil {
+		return svr.sendError(p, err)
+	}
+
+	ret := sshFxpNamePacket{ID: p.ID}
+	for _, dirent := range dirents {
+		ret.NameAttrs = append(ret.NameAttrs, sshFxpNameAttr{
+			Name:     dirent.Name(),
+			LongName: runLs(dirname, dirent),
+			Attrs:    []interface{}{dirent},
+		})
+	}
+	return svr.sendPacket(ret)
+}
+
+func (p sshFxpSetstatPacket) respond(svr *Server) error {
+	// additional unmarshalling is required for each possibility here
+	b := p.Attrs.([]byte)
+	var err error
+
+	debug("setstat name \"%s\"", p.Path)
+	if (p.Flags & ssh_FILEXFER_ATTR_SIZE) != 0 {
+		var size uint64
+		if size, b, err = unmarshalUint64Safe(b); err == nil {
+			err = os.Truncate(p.Path, int64(size))
+		}
+	}
+	if (p.Flags & ssh_FILEXFER_ATTR_PERMISSIONS) != 0 {
+		var mode uint32
+		if mode, b, err = unmarshalUint32Safe(b); err == nil {
+			err = os.Chmod(p.Path, os.FileMode(mode))
+		}
+	}
+	if (p.Flags & ssh_FILEXFER_ATTR_ACMODTIME) != 0 {
+		var atime uint32
+		var mtime uint32
+		if atime, b, err = unmarshalUint32Safe(b); err != nil {
+		} else if mtime, b, err = unmarshalUint32Safe(b); err != nil {
+		} else {
+			atimeT := time.Unix(int64(atime), 0)
+			mtimeT := time.Unix(int64(mtime), 0)
+			err = os.Chtimes(p.Path, atimeT, mtimeT)
+		}
+	}
+	if (p.Flags & ssh_FILEXFER_ATTR_UIDGID) != 0 {
+		var uid uint32
+		var gid uint32
+		if uid, b, err = unmarshalUint32Safe(b); err != nil {
+		} else if gid, _, err = unmarshalUint32Safe(b); err != nil {
+		} else {
+			err = os.Chown(p.Path, int(uid), int(gid))
+		}
+	}
+
+	return svr.sendError(p, err)
+}
+
+func (p sshFxpFsetstatPacket) respond(svr *Server) error {
+	f, ok := svr.getHandle(p.Handle)
+	if !ok {
+		return svr.sendError(p, syscall.EBADF)
+	}
+
+	// additional unmarshalling is required for each possibility here
+	b := p.Attrs.([]byte)
+	var err error
+
+	debug("fsetstat name \"%s\"", f.Name())
+	if (p.Flags & ssh_FILEXFER_ATTR_SIZE) != 0 {
+		var size uint64
+		if size, b, err = unmarshalUint64Safe(b); err == nil {
+			err = f.Truncate(int64(size))
+		}
+	}
+	if (p.Flags & ssh_FILEXFER_ATTR_PERMISSIONS) != 0 {
+		var mode uint32
+		if mode, b, err = unmarshalUint32Safe(b); err == nil {
+			err = f.Chmod(os.FileMode(mode))
+		}
+	}
+	if (p.Flags & ssh_FILEXFER_ATTR_ACMODTIME) != 0 {
+		var atime uint32
+		var mtime uint32
+		if atime, b, err = unmarshalUint32Safe(b); err != nil {
+		} else if mtime, b, err = unmarshalUint32Safe(b); err != nil {
+		} else {
+			atimeT := time.Unix(int64(atime), 0)
+			mtimeT := time.Unix(int64(mtime), 0)
+			err = os.Chtimes(f.Name(), atimeT, mtimeT)
+		}
+	}
+	if (p.Flags & ssh_FILEXFER_ATTR_UIDGID) != 0 {
+		var uid uint32
+		var gid uint32
+		if uid, b, err = unmarshalUint32Safe(b); err != nil {
+		} else if gid, _, err = unmarshalUint32Safe(b); err != nil {
+		} else {
+			err = f.Chown(int(uid), int(gid))
+		}
+	}
+
+	return svr.sendError(p, err)
+}
+
+// translateErrno translates a syscall error number to a SFTP error code.
+func translateErrno(errno syscall.Errno) uint32 {
+	switch errno {
+	case 0:
+		return ssh_FX_OK
+	case syscall.ENOENT:
+		return ssh_FX_NO_SUCH_FILE
+	case syscall.EPERM:
+		return ssh_FX_PERMISSION_DENIED
+	}
+
+	return ssh_FX_FAILURE
+}
+
+func statusFromError(p ider, err error) sshFxpStatusPacket {
+	ret := sshFxpStatusPacket{
+		ID: p.id(),
+		StatusError: StatusError{
+			// ssh_FX_OK                = 0
+			// ssh_FX_EOF               = 1
+			// ssh_FX_NO_SUCH_FILE      = 2 ENOENT
+			// ssh_FX_PERMISSION_DENIED = 3
+			// ssh_FX_FAILURE           = 4
+			// ssh_FX_BAD_MESSAGE       = 5
+			// ssh_FX_NO_CONNECTION     = 6
+			// ssh_FX_CONNECTION_LOST   = 7
+			// ssh_FX_OP_UNSUPPORTED    = 8
+			Code: ssh_FX_OK,
+		},
+	}
+	if err == nil {
+		return ret
+	}
+
+	debug("statusFromError: error is %T %#v", err, err)
+	ret.StatusError.Code = ssh_FX_FAILURE
+	ret.StatusError.msg = err.Error()
+
+	switch e := err.(type) {
+	case syscall.Errno:
+		ret.StatusError.Code = translateErrno(e)
+	case *os.PathError:
+		debug("statusFromError,pathError: error is %T %#v", e.Err, e.Err)
+		if errno, ok := e.Err.(syscall.Errno); ok {
+			ret.StatusError.Code = translateErrno(errno)
+		}
+	case fxerr:
+		ret.StatusError.Code = uint32(e)
+	default:
+		switch e {
+		case io.EOF:
+			ret.StatusError.Code = ssh_FX_EOF
+		case os.ErrNotExist:
+			ret.StatusError.Code = ssh_FX_NO_SUCH_FILE
+		}
+	}
+
+	return ret
+}
+
+func clamp(v, max uint32) uint32 {
+	if v > max {
+		return max
+	}
+	return v
+}
+
+func runLsTypeWord(dirent os.FileInfo) string {
+	// find first character, the type char
+	// b     Block special file.
+	// c     Character special file.
+	// d     Directory.
+	// l     Symbolic link.
+	// s     Socket link.
+	// p     FIFO.
+	// -     Regular file.
+	tc := '-'
+	mode := dirent.Mode()
+	if (mode & os.ModeDir) != 0 {
+		tc = 'd'
+	} else if (mode & os.ModeDevice) != 0 {
+		tc = 'b'
+		if (mode & os.ModeCharDevice) != 0 {
+			tc = 'c'
+		}
+	} else if (mode & os.ModeSymlink) != 0 {
+		tc = 'l'
+	} else if (mode & os.ModeSocket) != 0 {
+		tc = 's'
+	} else if (mode & os.ModeNamedPipe) != 0 {
+		tc = 'p'
+	}
+
+	// owner
+	orc := '-'
+	if (mode & 0400) != 0 {
+		orc = 'r'
+	}
+	owc := '-'
+	if (mode & 0200) != 0 {
+		owc = 'w'
+	}
+	oxc := '-'
+	ox := (mode & 0100) != 0
+	setuid := (mode & os.ModeSetuid) != 0
+	if ox && setuid {
+		oxc = 's'
+	} else if setuid {
+		oxc = 'S'
+	} else if ox {
+		oxc = 'x'
+	}
+
+	// group
+	grc := '-'
+	if (mode & 040) != 0 {
+		grc = 'r'
+	}
+	gwc := '-'
+	if (mode & 020) != 0 {
+		gwc = 'w'
+	}
+	gxc := '-'
+	gx := (mode & 010) != 0
+	setgid := (mode & os.ModeSetgid) != 0
+	if gx && setgid {
+		gxc = 's'
+	} else if setgid {
+		gxc = 'S'
+	} else if gx {
+		gxc = 'x'
+	}
+
+	// all / others
+	arc := '-'
+	if (mode & 04) != 0 {
+		arc = 'r'
+	}
+	awc := '-'
+	if (mode & 02) != 0 {
+		awc = 'w'
+	}
+	axc := '-'
+	ax := (mode & 01) != 0
+	sticky := (mode & os.ModeSticky) != 0
+	if ax && sticky {
+		axc = 't'
+	} else if sticky {
+		axc = 'T'
+	} else if ax {
+		axc = 'x'
+	}
+
+	return fmt.Sprintf("%c%c%c%c%c%c%c%c%c%c", tc, orc, owc, oxc, grc, gwc, gxc, arc, awc, axc)
+}

vendor/github.com/pkg/sftp/server_standalone/main.go

@@ -0,0 +1,52 @@
+package main
+
+// small wrapper around sftp server that allows it to be used as a separate process subsystem call by the ssh server.
+// in practice this will statically link; however this allows unit testing from the sftp client.
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+
+	"github.com/pkg/sftp"
+)
+
+func main() {
+	var (
+		readOnly    bool
+		debugStderr bool
+		debugLevel  string
+		options     []sftp.ServerOption
+	)
+
+	flag.BoolVar(&readOnly, "R", false, "read-only server")
+	flag.BoolVar(&debugStderr, "e", false, "debug to stderr")
+	flag.StringVar(&debugLevel, "l", "none", "debug level (ignored)")
+	flag.Parse()
+
+	debugStream := ioutil.Discard
+	if debugStderr {
+		debugStream = os.Stderr
+	}
+	options = append(options, sftp.WithDebug(debugStream))
+
+	if readOnly {
+		options = append(options, sftp.ReadOnly())
+	}
+
+	svr, _ := sftp.NewServer(
+		struct {
+			io.Reader
+			io.WriteCloser
+		}{os.Stdin,
+			os.Stdout,
+		},
+		options...,
+	)
+	if err := svr.Serve(); err != nil {
+		fmt.Fprintf(debugStream, "sftp server completed with error: %v", err)
+		os.Exit(1)
+	}
+}

vendor/github.com/pkg/sftp/server_statvfs_darwin.go

@@ -0,0 +1,21 @@
+package sftp
+
+import (
+	"syscall"
+)
+
+func statvfsFromStatfst(stat *syscall.Statfs_t) (*StatVFS, error) {
+	return &StatVFS{
+		Bsize:   uint64(stat.Bsize),
+		Frsize:  uint64(stat.Bsize), // fragment size is a linux thing; use block size here
+		Blocks:  stat.Blocks,
+		Bfree:   stat.Bfree,
+		Bavail:  stat.Bavail,
+		Files:   stat.Files,
+		Ffree:   stat.Ffree,
+		Favail:  stat.Ffree,                                                      // not sure how to calculate Favail
+		Fsid:    uint64(uint64(stat.Fsid.Val[1])<<32 | uint64(stat.Fsid.Val[0])), // endianness?
+		Flag:    uint64(stat.Flags),                                              // assuming POSIX?
+		Namemax: 1024,                                                            // man 2 statfs shows: #define MAXPATHLEN      1024
+	}, nil
+}

vendor/github.com/pkg/sftp/server_statvfs_impl.go

@@ -0,0 +1,25 @@
+// +build darwin linux
+
+// fill in statvfs structure with OS specific values
+// Statfs_t is different per-kernel, and only exists on some unixes (not Solaris for instance)
+
+package sftp
+
+import (
+	"syscall"
+)
+
+func (p sshFxpExtendedPacketStatVFS) respond(svr *Server) error {
+	stat := &syscall.Statfs_t{}
+	if err := syscall.Statfs(p.Path, stat); err != nil {
+		return svr.sendPacket(statusFromError(p, err))
+	}
+
+	retPkt, err := statvfsFromStatfst(stat)
+	if err != nil {
+		return svr.sendPacket(statusFromError(p, err))
+	}
+	retPkt.ID = p.ID
+
+	return svr.sendPacket(retPkt)
+}

vendor/github.com/pkg/sftp/server_statvfs_linux.go

@@ -0,0 +1,22 @@
+// +build linux
+
+package sftp
+
+import (
+	"syscall"
+)
+
+func statvfsFromStatfst(stat *syscall.Statfs_t) (*StatVFS, error) {
+	return &StatVFS{
+		Bsize:   uint64(stat.Bsize),
+		Frsize:  uint64(stat.Frsize),
+		Blocks:  stat.Blocks,
+		Bfree:   stat.Bfree,
+		Bavail:  stat.Bavail,
+		Files:   stat.Files,
+		Ffree:   stat.Ffree,
+		Favail:  stat.Ffree,         // not sure how to calculate Favail
+		Flag:    uint64(stat.Flags), // assuming POSIX?
+		Namemax: uint64(stat.Namelen),
+	}, nil
+}

vendor/github.com/pkg/sftp/server_statvfs_stubs.go

@@ -0,0 +1,11 @@
+// +build !darwin,!linux
+
+package sftp
+
+import (
+	"syscall"
+)
+
+func (p sshFxpExtendedPacketStatVFS) respond(svr *Server) error {
+	return syscall.ENOTSUP
+}

vendor/github.com/pkg/sftp/server_stubs.go

@@ -0,0 +1,32 @@
+// +build !cgo,!plan9 windows android
+
+package sftp
+
+import (
+	"os"
+	"time"
+	"fmt"
+)
+
+func runLs(dirname string, dirent os.FileInfo) string {
+	typeword := runLsTypeWord(dirent)
+	numLinks := 1
+	if dirent.IsDir() {
+		numLinks = 0
+	}
+	username := "root"
+	groupname := "root"
+	mtime := dirent.ModTime()
+	monthStr := mtime.Month().String()[0:3]
+	day := mtime.Day()
+	year := mtime.Year()
+	now := time.Now()
+	isOld := mtime.Before(now.Add(-time.Hour * 24 * 365 / 2))
+
+	yearOrTime := fmt.Sprintf("%02d:%02d", mtime.Hour(), mtime.Minute())
+	if isOld {
+		yearOrTime = fmt.Sprintf("%d", year)
+	}
+
+	return fmt.Sprintf("%s %4d %-8s %-8s %8d %s %2d %5s %s", typeword, numLinks, username, groupname, dirent.Size(), monthStr, day, yearOrTime, dirent.Name())
+}

vendor/github.com/pkg/sftp/server_unix.go

@@ -0,0 +1,54 @@
+// +build darwin dragonfly freebsd !android,linux netbsd openbsd solaris
+// +build cgo
+
+package sftp
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"syscall"
+	"time"
+)
+
+func runLsStatt(dirent os.FileInfo, statt *syscall.Stat_t) string {
+	// example from openssh sftp server:
+	// crw-rw-rw-    1 root     wheel           0 Jul 31 20:52 ttyvd
+	// format:
+	// {directory / char device / etc}{rwxrwxrwx}  {number of links} owner group size month day [time (this year) | year (otherwise)] name
+
+	typeword := runLsTypeWord(dirent)
+	numLinks := statt.Nlink
+	uid := statt.Uid
+	gid := statt.Gid
+	username := fmt.Sprintf("%d", uid)
+	groupname := fmt.Sprintf("%d", gid)
+	// TODO FIXME: uid -> username, gid -> groupname lookup for ls -l format output
+
+	mtime := dirent.ModTime()
+	monthStr := mtime.Month().String()[0:3]
+	day := mtime.Day()
+	year := mtime.Year()
+	now := time.Now()
+	isOld := mtime.Before(now.Add(-time.Hour * 24 * 365 / 2))
+
+	yearOrTime := fmt.Sprintf("%02d:%02d", mtime.Hour(), mtime.Minute())
+	if isOld {
+		yearOrTime = fmt.Sprintf("%d", year)
+	}
+
+	return fmt.Sprintf("%s %4d %-8s %-8s %8d %s %2d %5s %s", typeword, numLinks, username, groupname, dirent.Size(), monthStr, day, yearOrTime, dirent.Name())
+}
+
+// ls -l style output for a file, which is in the 'long output' section of a readdir response packet
+// this is a very simple (lazy) implementation, just enough to look almost like openssh in a few basic cases
+func runLs(dirname string, dirent os.FileInfo) string {
+	dsys := dirent.Sys()
+	if dsys == nil {
+	} else if statt, ok := dsys.(*syscall.Stat_t); !ok {
+	} else {
+		return runLsStatt(dirent, statt)
+	}
+
+	return path.Join(dirname, dirent.Name())
+}

vendor/github.com/pkg/sftp/sftp.go

@@ -0,0 +1,217 @@
+// Package sftp implements the SSH File Transfer Protocol as described in
+// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02
+package sftp
+
+import (
+	"fmt"
+
+	"github.com/pkg/errors"
+)
+
+const (
+	ssh_FXP_INIT           = 1
+	ssh_FXP_VERSION        = 2
+	ssh_FXP_OPEN           = 3
+	ssh_FXP_CLOSE          = 4
+	ssh_FXP_READ           = 5
+	ssh_FXP_WRITE          = 6
+	ssh_FXP_LSTAT          = 7
+	ssh_FXP_FSTAT          = 8
+	ssh_FXP_SETSTAT        = 9
+	ssh_FXP_FSETSTAT       = 10
+	ssh_FXP_OPENDIR        = 11
+	ssh_FXP_READDIR        = 12
+	ssh_FXP_REMOVE         = 13
+	ssh_FXP_MKDIR          = 14
+	ssh_FXP_RMDIR          = 15
+	ssh_FXP_REALPATH       = 16
+	ssh_FXP_STAT           = 17
+	ssh_FXP_RENAME         = 18
+	ssh_FXP_READLINK       = 19
+	ssh_FXP_SYMLINK        = 20
+	ssh_FXP_STATUS         = 101
+	ssh_FXP_HANDLE         = 102
+	ssh_FXP_DATA           = 103
+	ssh_FXP_NAME           = 104
+	ssh_FXP_ATTRS          = 105
+	ssh_FXP_EXTENDED       = 200
+	ssh_FXP_EXTENDED_REPLY = 201
+)
+
+const (
+	ssh_FX_OK                = 0
+	ssh_FX_EOF               = 1
+	ssh_FX_NO_SUCH_FILE      = 2
+	ssh_FX_PERMISSION_DENIED = 3
+	ssh_FX_FAILURE           = 4
+	ssh_FX_BAD_MESSAGE       = 5
+	ssh_FX_NO_CONNECTION     = 6
+	ssh_FX_CONNECTION_LOST   = 7
+	ssh_FX_OP_UNSUPPORTED    = 8
+
+	// see draft-ietf-secsh-filexfer-13
+	// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-9.1
+	ssh_FX_INVALID_HANDLE              = 9
+	ssh_FX_NO_SUCH_PATH                = 10
+	ssh_FX_FILE_ALREADY_EXISTS         = 11
+	ssh_FX_WRITE_PROTECT               = 12
+	ssh_FX_NO_MEDIA                    = 13
+	ssh_FX_NO_SPACE_ON_FILESYSTEM      = 14
+	ssh_FX_QUOTA_EXCEEDED              = 15
+	ssh_FX_UNKNOWN_PRINCIPAL           = 16
+	ssh_FX_LOCK_CONFLICT               = 17
+	ssh_FX_DIR_NOT_EMPTY               = 18
+	ssh_FX_NOT_A_DIRECTORY             = 19
+	ssh_FX_INVALID_FILENAME            = 20
+	ssh_FX_LINK_LOOP                   = 21
+	ssh_FX_CANNOT_DELETE               = 22
+	ssh_FX_INVALID_PARAMETER           = 23
+	ssh_FX_FILE_IS_A_DIRECTORY         = 24
+	ssh_FX_BYTE_RANGE_LOCK_CONFLICT    = 25
+	ssh_FX_BYTE_RANGE_LOCK_REFUSED     = 26
+	ssh_FX_DELETE_PENDING              = 27
+	ssh_FX_FILE_CORRUPT                = 28
+	ssh_FX_OWNER_INVALID               = 29
+	ssh_FX_GROUP_INVALID               = 30
+	ssh_FX_NO_MATCHING_BYTE_RANGE_LOCK = 31
+)
+
+const (
+	ssh_FXF_READ   = 0x00000001
+	ssh_FXF_WRITE  = 0x00000002
+	ssh_FXF_APPEND = 0x00000004
+	ssh_FXF_CREAT  = 0x00000008
+	ssh_FXF_TRUNC  = 0x00000010
+	ssh_FXF_EXCL   = 0x00000020
+)
+
+type fxp uint8
+
+func (f fxp) String() string {
+	switch f {
+	case ssh_FXP_INIT:
+		return "SSH_FXP_INIT"
+	case ssh_FXP_VERSION:
+		return "SSH_FXP_VERSION"
+	case ssh_FXP_OPEN:
+		return "SSH_FXP_OPEN"
+	case ssh_FXP_CLOSE:
+		return "SSH_FXP_CLOSE"
+	case ssh_FXP_READ:
+		return "SSH_FXP_READ"
+	case ssh_FXP_WRITE:
+		return "SSH_FXP_WRITE"
+	case ssh_FXP_LSTAT:
+		return "SSH_FXP_LSTAT"
+	case ssh_FXP_FSTAT:
+		return "SSH_FXP_FSTAT"
+	case ssh_FXP_SETSTAT:
+		return "SSH_FXP_SETSTAT"
+	case ssh_FXP_FSETSTAT:
+		return "SSH_FXP_FSETSTAT"
+	case ssh_FXP_OPENDIR:
+		return "SSH_FXP_OPENDIR"
+	case ssh_FXP_READDIR:
+		return "SSH_FXP_READDIR"
+	case ssh_FXP_REMOVE:
+		return "SSH_FXP_REMOVE"
+	case ssh_FXP_MKDIR:
+		return "SSH_FXP_MKDIR"
+	case ssh_FXP_RMDIR:
+		return "SSH_FXP_RMDIR"
+	case ssh_FXP_REALPATH:
+		return "SSH_FXP_REALPATH"
+	case ssh_FXP_STAT:
+		return "SSH_FXP_STAT"
+	case ssh_FXP_RENAME:
+		return "SSH_FXP_RENAME"
+	case ssh_FXP_READLINK:
+		return "SSH_FXP_READLINK"
+	case ssh_FXP_SYMLINK:
+		return "SSH_FXP_SYMLINK"
+	case ssh_FXP_STATUS:
+		return "SSH_FXP_STATUS"
+	case ssh_FXP_HANDLE:
+		return "SSH_FXP_HANDLE"
+	case ssh_FXP_DATA:
+		return "SSH_FXP_DATA"
+	case ssh_FXP_NAME:
+		return "SSH_FXP_NAME"
+	case ssh_FXP_ATTRS:
+		return "SSH_FXP_ATTRS"
+	case ssh_FXP_EXTENDED:
+		return "SSH_FXP_EXTENDED"
+	case ssh_FXP_EXTENDED_REPLY:
+		return "SSH_FXP_EXTENDED_REPLY"
+	default:
+		return "unknown"
+	}
+}
+
+type fx uint8
+
+func (f fx) String() string {
+	switch f {
+	case ssh_FX_OK:
+		return "SSH_FX_OK"
+	case ssh_FX_EOF:
+		return "SSH_FX_EOF"
+	case ssh_FX_NO_SUCH_FILE:
+		return "SSH_FX_NO_SUCH_FILE"
+	case ssh_FX_PERMISSION_DENIED:
+		return "SSH_FX_PERMISSION_DENIED"
+	case ssh_FX_FAILURE:
+		return "SSH_FX_FAILURE"
+	case ssh_FX_BAD_MESSAGE:
+		return "SSH_FX_BAD_MESSAGE"
+	case ssh_FX_NO_CONNECTION:
+		return "SSH_FX_NO_CONNECTION"
+	case ssh_FX_CONNECTION_LOST:
+		return "SSH_FX_CONNECTION_LOST"
+	case ssh_FX_OP_UNSUPPORTED:
+		return "SSH_FX_OP_UNSUPPORTED"
+	default:
+		return "unknown"
+	}
+}
+
+type unexpectedPacketErr struct {
+	want, got uint8
+}
+
+func (u *unexpectedPacketErr) Error() string {
+	return fmt.Sprintf("sftp: unexpected packet: want %v, got %v", fxp(u.want), fxp(u.got))
+}
+
+func unimplementedPacketErr(u uint8) error {
+	return errors.Errorf("sftp: unimplemented packet type: got %v", fxp(u))
+}
+
+type unexpectedIDErr struct{ want, got uint32 }
+
+func (u *unexpectedIDErr) Error() string {
+	return fmt.Sprintf("sftp: unexpected id: want %v, got %v", u.want, u.got)
+}
+
+func unimplementedSeekWhence(whence int) error {
+	return errors.Errorf("sftp: unimplemented seek whence %v", whence)
+}
+
+func unexpectedCount(want, got uint32) error {
+	return errors.Errorf("sftp: unexpected count: want %v, got %v", want, got)
+}
+
+type unexpectedVersionErr struct{ want, got uint32 }
+
+func (u *unexpectedVersionErr) Error() string {
+	return fmt.Sprintf("sftp: unexpected server version: want %v, got %v", u.want, u.got)
+}
+
+// A StatusError is returned when an SFTP operation fails, and provides
+// additional information about the failure.
+type StatusError struct {
+	Code      uint32
+	msg, lang string
+}
+
+func (s *StatusError) Error() string { return fmt.Sprintf("sftp: %q (%v)", s.msg, fx(s.Code)) }