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package ssh
import (
"io"
"strconv"
"strings"
"sync"
"github.com/git-lfs/git-lfs/v3/errors"
"github.com/git-lfs/git-lfs/v3/subprocess"
"github.com/git-lfs/git-lfs/v3/tr"
)
type PktlineConnection struct {
r io.ReadCloser
w io.WriteCloser
mu sync.Mutex
cmd *subprocess.Cmd
pl Pktline
}
func (conn *PktlineConnection) Lock() {
conn.mu.Lock()
}
func (conn *PktlineConnection) Unlock() {
conn.mu.Unlock()
}
func (conn *PktlineConnection) Start() error {
conn.Lock()
defer conn.Unlock()
return conn.negotiateVersion()
}
func (conn *PktlineConnection) End() error {
conn.Lock()
defer conn.Unlock()
err := conn.SendMessage("quit", nil)
if err != nil {
return err
}
_, err = conn.ReadStatus()
conn.r.Close()
conn.w.Close()
conn.cmd.Wait()
return err
}
func (conn *PktlineConnection) negotiateVersion() error {
pkts, err := conn.pl.ReadPacketList()
if err != nil {
return errors.NewProtocolError(tr.Tr.Get("Unable to negotiate version with remote side (unable to read capabilities)"), err)
}
ok := false
for _, line := range pkts {
if line == "version=1" {
ok = true
}
}
if !ok {
return errors.NewProtocolError(tr.Tr.Get("Unable to negotiate version with remote side (missing version=1)"), nil)
}
err = conn.SendMessage("version 1", nil)
if err != nil {
return errors.NewProtocolError(tr.Tr.Get("Unable to negotiate version with remote side (unable to send version)"), err)
}
status, args, _, err := conn.ReadStatusWithLines()
if err != nil {
return errors.NewProtocolError(tr.Tr.Get("Unable to negotiate version with remote side (unable to read status)"), err)
}
if status != 200 {
text := tr.Tr.Get("no error provided")
if len(args) > 0 {
text = tr.Tr.Get("server said: %q", args[0])
}
return errors.NewProtocolError(tr.Tr.Get("Unable to negotiate version with remote side (unexpected status %d; %s)", status, text), nil)
}
return nil
}
func (conn *PktlineConnection) SendMessage(command string, args []string) error {
err := conn.pl.WritePacketText(command)
if err != nil {
return err
}
for _, arg := range args {
err = conn.pl.WritePacketText(arg)
if err != nil {
return err
}
}
return conn.pl.WriteFlush()
}
func (conn *PktlineConnection) SendMessageWithLines(command string, args []string, lines []string) error {
err := conn.pl.WritePacketText(command)
if err != nil {
return err
}
for _, arg := range args {
err = conn.pl.WritePacketText(arg)
if err != nil {
return err
}
}
err = conn.pl.WriteDelim()
if err != nil {
return err
}
for _, line := range lines {
err = conn.pl.WritePacketText(line)
if err != nil {
return err
}
}
return conn.pl.WriteFlush()
}
func (conn *PktlineConnection) SendMessageWithData(command string, args []string, data io.Reader) error {
err := conn.pl.WritePacketText(command)
if err != nil {
return err
}
for _, arg := range args {
err = conn.pl.WritePacketText(arg)
if err != nil {
return err
}
}
err = conn.pl.WriteDelim()
if err != nil {
return err
}
buf := make([]byte, 32768)
for {
n, err := data.Read(buf)
if n > 0 {
err := conn.pl.WritePacket(buf[0:n])
if err != nil {
return err
}
}
if err != nil {
break
}
}
return conn.pl.WriteFlush()
}
func (conn *PktlineConnection) ReadStatus() (int, error) {
status := 0
seenStatus := false
for {
s, pktLen, err := conn.pl.ReadPacketTextWithLength()
if err != nil {
return 0, errors.NewProtocolError(tr.Tr.Get("error reading packet"), err)
}
switch {
case pktLen == 0:
if !seenStatus {
return 0, errors.NewProtocolError(tr.Tr.Get("no status seen"), nil)
}
return status, nil
case !seenStatus:
ok := false
if strings.HasPrefix(s, "status ") {
status, err = strconv.Atoi(s[7:])
ok = err == nil
}
if !ok {
return 0, errors.NewProtocolError(tr.Tr.Get("expected status line, got %q", s), err)
}
seenStatus = true
default:
return 0, errors.NewProtocolError(tr.Tr.Get("unexpected data, got %q", s), err)
}
}
}
// ReadStatusWithData reads a status, arguments, and any binary data. Note that
// the reader must be fully exhausted before invoking any other read methods.
func (conn *PktlineConnection) ReadStatusWithData() (int, []string, io.Reader, error) {
args := make([]string, 0, 100)
status := 0
seenStatus := false
for {
s, pktLen, err := conn.pl.ReadPacketTextWithLength()
if err != nil {
return 0, nil, nil, errors.NewProtocolError(tr.Tr.Get("error reading packet"), err)
}
if pktLen == 0 {
if !seenStatus {
return 0, nil, nil, errors.NewProtocolError(tr.Tr.Get("no status seen"), nil)
}
return 0, nil, nil, errors.NewProtocolError(tr.Tr.Get("unexpected flush packet"), nil)
} else if !seenStatus {
ok := false
if strings.HasPrefix(s, "status ") {
status, err = strconv.Atoi(s[7:])
ok = err == nil
}
if !ok {
return 0, nil, nil, errors.NewProtocolError(tr.Tr.Get("expected status line, got %q", s), err)
}
seenStatus = true
} else if pktLen == 1 {
break
} else {
args = append(args, s)
}
}
return status, args, pktlineReader(conn.pl), nil
}
// ReadStatusWithLines reads a status, arguments, and a set of text lines.
func (conn *PktlineConnection) ReadStatusWithLines() (int, []string, []string, error) {
args := make([]string, 0, 100)
lines := make([]string, 0, 100)
status := 0
seenDelim := false
seenStatus := false
for {
s, pktLen, err := conn.pl.ReadPacketTextWithLength()
if err != nil {
return 0, nil, nil, errors.NewProtocolError(tr.Tr.Get("error reading packet"), err)
}
switch {
case pktLen == 0:
if !seenStatus {
return 0, nil, nil, errors.NewProtocolError(tr.Tr.Get("no status seen"), nil)
}
return status, args, lines, nil
case seenDelim:
lines = append(lines, s)
case !seenStatus:
ok := false
if strings.HasPrefix(s, "status ") {
status, err = strconv.Atoi(s[7:])
ok = err == nil
}
if !ok {
return 0, nil, nil, errors.NewProtocolError(tr.Tr.Get("expected status line, got %q", s), err)
}
seenStatus = true
case pktLen == 1:
if seenDelim {
return 0, nil, nil, errors.NewProtocolError(tr.Tr.Get("unexpected delimiter packet"), nil)
}
seenDelim = true
default:
args = append(args, s)
}
}
}
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