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ssh system commands: wait on write from command out to network

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we only need to wait for the write from the local command to
the ssh channel. There is no need to wait for the write from ssh
channel to the local command stdin
This commit is contained in:
Nicola Murino 2019-11-27 22:33:17 +01:00
parent 7de0fe467a
commit bc844105b2
2 changed files with 5 additions and 7 deletions
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2
sftpd/sftpd.go
View file

@ -424,7 +424,7 @@ func executeAction(operation, username, path, target, sshCmd string) error {
if _, err = os.Stat(actions.Command); err == nil {
command := exec.Command(actions.Command, operation, username, path, target, sshCmd)
err = command.Start()
logger.Debug(logSender, "", "start command %#v with arguments: %v, %v, %v, %v %v, error: %v",
logger.Debug(logSender, "", "start command %#v with arguments: %#v, %#v, %#v, %#v, %#v, error: %v",
actions.Command, operation, username, path, target, sshCmd, err)
if err == nil {
// we are in a goroutine but we don't want to block here, this way we can send the

10
sftpd/ssh_cmd.go
View file

@ -174,8 +174,7 @@ func (c *sshCommand) executeSystemCommand(command systemCommand) error {
c.connection.channel.Close()
}
var once sync.Once
var wg sync.WaitGroup
wg.Add(2)
commandResponse := make(chan bool)
go func() {
defer stdin.Close()
@ -207,7 +206,6 @@ func (c *sshCommand) executeSystemCommand(command systemCommand) error {
if e != nil {
once.Do(closeCmdOnError)
}
wg.Done()
}()
go func() {
@ -235,7 +233,7 @@ func (c *sshCommand) executeSystemCommand(command systemCommand) error {
if e != nil {
once.Do(closeCmdOnError)
}
wg.Done()
commandResponse <- true
}()
go func() {
@ -265,7 +263,7 @@ func (c *sshCommand) executeSystemCommand(command systemCommand) error {
}
}()
wg.Wait()
<-commandResponse
err = command.cmd.Wait()
c.sendExitStatus(err)
c.rescanHomeDir()
@ -290,7 +288,7 @@ func (c *sshCommand) getSystemCommand() (systemCommand, error) {
args = args[:len(args)-1]
args = append(args, path)
}
c.connection.Log(logger.LevelDebug, logSenderSSH, "new system command: %v, with args: %v path: %v", c.command, args, path)
c.connection.Log(logger.LevelDebug, logSenderSSH, "new system command %#v, with args: %v path: %v", c.command, args, path)
cmd := exec.Command(c.command, args...)
uid := c.connection.User.GetUID()
gid := c.connection.User.GetGID()