/usr/share/gocode/src/github.com/pkg/sftp/request.go is in golang-github-pkg-sftp-dev 0.0~git20170704.0.e97b9a4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"io"
"os"
"path"
"path/filepath"
"sync"
"syscall"
"github.com/pkg/errors"
)
// 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
// packet data
pkt_id uint32
packets chan packet_data
// reader/writer/readdir from handlers
stateLock *sync.RWMutex
state *state
}
type state struct {
writerAt io.WriterAt
readerAt io.ReaderAt
endofdir bool // need to track when to send EOF for readdir
}
type packet_data struct {
id uint32
data []byte
length uint32
offset int64
}
// New Request initialized based on packet data
func requestFromPacket(pkt hasPath) Request {
method := requestMethod(pkt)
request := NewRequest(method, pkt.getPath())
request.pkt_id = pkt.id()
switch p := pkt.(type) {
case *sshFxpSetstatPacket:
request.Flags = p.Flags
request.Attrs = p.Attrs.([]byte)
case *sshFxpRenamePacket:
request.Target = filepath.Clean(p.Newpath)
case *sshFxpSymlinkPacket:
request.Target = filepath.Clean(p.Linkpath)
}
return request
}
// NewRequest creates a new Request object.
func NewRequest(method, path string) Request {
request := Request{Method: method, Filepath: filepath.Clean(path)}
request.packets = make(chan packet_data, sftpServerWorkerCount)
request.state = &state{}
request.stateLock = &sync.RWMutex{}
return request
}
// manage state
func (r Request) setState(s interface{}) {
r.stateLock.Lock()
defer r.stateLock.Unlock()
switch s := s.(type) {
case io.WriterAt:
r.state.writerAt = s
case io.ReaderAt:
r.state.readerAt = s
case bool:
r.state.endofdir = s
}
}
func (r Request) getWriter() io.WriterAt {
r.stateLock.RLock()
defer r.stateLock.RUnlock()
return r.state.writerAt
}
func (r Request) getReader() io.ReaderAt {
r.stateLock.RLock()
defer r.stateLock.RUnlock()
return r.state.readerAt
}
func (r Request) getEOD() bool {
r.stateLock.RLock()
defer r.stateLock.RUnlock()
return r.state.endofdir
}
// Close reader/writer if possible
func (r Request) close() {
rd := r.getReader()
if c, ok := rd.(io.Closer); ok {
c.Close()
}
wt := r.getWriter()
if c, ok := wt.(io.Closer); ok {
c.Close()
}
}
// push packet_data into fifo
func (r Request) pushPacket(pd packet_data) {
r.packets <- pd
}
// pop packet_data into fifo
func (r *Request) popPacket() packet_data {
return <-r.packets
}
// called from worker to handle packet/request
func (r Request) handle(handlers Handlers) (responsePacket, error) {
var err error
var rpkt responsePacket
switch r.Method {
case "Get":
rpkt, err = fileget(handlers.FileGet, r)
case "Put": // add "Append" to this to handle append only file writes
rpkt, err = fileput(handlers.FilePut, r)
case "Setstat", "Rename", "Rmdir", "Mkdir", "Symlink", "Remove":
rpkt, err = filecmd(handlers.FileCmd, r)
case "List", "Stat", "Readlink":
rpkt, err = fileinfo(handlers.FileInfo, r)
default:
return rpkt, errors.Errorf("unexpected method: %s", r.Method)
}
return rpkt, err
}
// wrap FileReader handler
func fileget(h FileReader, r Request) (responsePacket, error) {
var err error
reader := r.getReader()
if reader == nil {
reader, err = h.Fileread(r)
if err != nil {
return nil, err
}
r.setState(reader)
}
pd := r.popPacket()
data := make([]byte, clamp(pd.length, maxTxPacket))
n, err := reader.ReadAt(data, pd.offset)
if err != nil && (err != io.EOF || n == 0) {
return nil, err
}
return &sshFxpDataPacket{
ID: pd.id,
Length: uint32(n),
Data: data[:n],
}, nil
}
// wrap FileWriter handler
func fileput(h FileWriter, r Request) (responsePacket, error) {
var err error
writer := r.getWriter()
if writer == nil {
writer, err = h.Filewrite(r)
if err != nil {
return nil, err
}
r.setState(writer)
}
pd := r.popPacket()
_, err = writer.WriteAt(pd.data, pd.offset)
if err != nil {
return nil, err
}
return &sshFxpStatusPacket{
ID: pd.id,
StatusError: StatusError{
Code: ssh_FX_OK,
}}, nil
}
// wrap FileCmder handler
func filecmd(h FileCmder, r Request) (responsePacket, error) {
err := h.Filecmd(r)
if err != nil {
return nil, err
}
return &sshFxpStatusPacket{
ID: r.pkt_id,
StatusError: StatusError{
Code: ssh_FX_OK,
}}, nil
}
// wrap FileInfoer handler
func fileinfo(h FileInfoer, r Request) (responsePacket, error) {
if r.getEOD() {
return nil, io.EOF
}
finfo, err := h.Fileinfo(r)
if err != nil {
return nil, err
}
switch r.Method {
case "List":
pd := r.popPacket()
dirname := path.Base(r.Filepath)
ret := &sshFxpNamePacket{ID: pd.id}
for _, fi := range finfo {
ret.NameAttrs = append(ret.NameAttrs, sshFxpNameAttr{
Name: fi.Name(),
LongName: runLs(dirname, fi),
Attrs: []interface{}{fi},
})
}
r.setState(true)
return ret, nil
case "Stat":
if len(finfo) == 0 {
err = &os.PathError{Op: "stat", Path: r.Filepath,
Err: syscall.ENOENT}
return nil, err
}
return &sshFxpStatResponse{
ID: r.pkt_id,
info: finfo[0],
}, nil
case "Readlink":
if len(finfo) == 0 {
err = &os.PathError{Op: "readlink", Path: r.Filepath,
Err: syscall.ENOENT}
return nil, err
}
filename := finfo[0].Name()
return &sshFxpNamePacket{
ID: r.pkt_id,
NameAttrs: []sshFxpNameAttr{{
Name: filename,
LongName: filename,
Attrs: emptyFileStat,
}},
}, nil
}
return nil, err
}
// file data for additional read/write packets
func (r *Request) update(p hasHandle) error {
pd := packet_data{id: p.id()}
switch p := p.(type) {
case *sshFxpReadPacket:
r.Method = "Get"
pd.length = p.Len
pd.offset = int64(p.Offset)
case *sshFxpWritePacket:
r.Method = "Put"
pd.data = p.Data
pd.length = p.Length
pd.offset = int64(p.Offset)
case *sshFxpReaddirPacket:
r.Method = "List"
default:
return errors.Errorf("unexpected packet type %T", p)
}
r.pushPacket(pd)
return nil
}
// init attributes of request object from packet data
func requestMethod(p hasPath) (method string) {
switch p.(type) {
case *sshFxpOpenPacket, *sshFxpOpendirPacket:
method = "Open"
case *sshFxpSetstatPacket:
method = "Setstat"
case *sshFxpRenamePacket:
method = "Rename"
case *sshFxpSymlinkPacket:
method = "Symlink"
case *sshFxpRemovePacket:
method = "Remove"
case *sshFxpStatPacket, *sshFxpLstatPacket:
method = "Stat"
case *sshFxpRmdirPacket:
method = "Rmdir"
case *sshFxpReadlinkPacket:
method = "Readlink"
case *sshFxpMkdirPacket:
method = "Mkdir"
}
return method
}
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