Re: How can I open one channel and than execute several different commands in libssh?

[孙世龙 sunshilong <sunshilong369@xxxxxxxxx>]

Bruno, Thank you for your reply.
>I do not have my notebook now.
>But you have to open a channel per each command.

If so, then one more question raises, how the "ssh"(i.e. a command
that could execute on Linux) could achieve this goal?

Best regards.
Sunshilong

On Sun, Feb 7, 2021 at 9:13 AM 孙世龙 sunshilong <sunshilong369@xxxxxxxxx> wrote:
>
> Hi,list
>
> For example i want to open one session and one channel and then
> execute severeal different commands. I have InitializeSSHSession and
> Initialize SSH channel methods can be seen below.
>
> void Computer::InitializeSSHSession()
>  {
>  ssh_session remoteSSHSession = ssh_new();
>
> if ( remoteSSHSession )
> {
>     QString password = this->GetPassword();
>     QString remoteIP = this->GetIP();
>     QString userName = this->GetUserNameW();
>
>     ssh_options_set(remoteSSHSession, SSH_OPTIONS_HOST,
> remoteIP.toStdString().c_str());
>     ssh_options_set(remoteSSHSession, SSH_OPTIONS_LOG_VERBOSITY,
> &sessionVerbosity);
>     ssh_options_set(remoteSSHSession, SSH_OPTIONS_PORT, &sessionPort);
>     ssh_options_set(remoteSSHSession, SSH_OPTIONS_USER,
> userName.toStdString().c_str());
>
>     int remoteConnection = ssh_connect(remoteSSHSession);
>     if ( remoteConnection == SSH_OK )
>     {
>         int authenticateControl =
> ssh_userauth_password(remoteSSHSession, NULL,
> password.toStdString().c_str());
>         if ( authenticateControl == SSH_AUTH_SUCCESS )
>         {
>             InitializeSSHChannel(remoteSSHSession);
>         }
>         else
>         {
>             remoteSSHSession = NULL;
>         }
>     }
>     else
>     {
>         remoteSSHSession = NULL;
>     }
> }
> else
> {
>      remoteSSHChannel = NULL;
> }
> }
>
> void Computer::InitializeSSHChannel(ssh_session remoteSSHSession)
> {
> remoteSSHChannel = ssh_channel_new(remoteSSHSession);
>
> if ( remoteSSHChannel )
> {
>     int channelControl = ssh_channel_open_session(remoteSSHChannel);
>     if ( channelControl != SSH_OK )
>     {
>         EventLogger::LogMessage(true, "SSH channel sesssion failed!");
>         ssh_channel_free(remoteSSHChannel);
>     }
> }
>  }
>
> And in the main, I am initializing session and getting channel like this:
>
>  InitializeSSHSession();
>  ssh_channel channel = GetSSHChannel();
>
> And then
>
>   int rc = ssh_channel_request_exec(channel, "ls -l");
>
> It is okay it is executed correctly but when i want to execute another
> command it is not execute, I should return the beginning of process
> first initialize session and getting channel again.
>
> It is not good solution for every command. Is it possible to do that
> once initialize session than use it again and again for every command
> ?