Re: Multiple calls to channel_request_exec()

[Aris Adamantiadis <aris@xxxxxxxxxxxx>]

Hi,

Indeed, you can execute only one command using channel_request_exec. But
you may either

-execute several commands
-start a scripting language
example:
channel_request_exec(channel,"cd /tmp; mkdir mytest; cd mytest; touch
mytest");
This will be executed as only one shell command. Another solution is
// Do NOT put the channel into interactive mode/pty
channel_request_shell(channel);
channel_write(channel,"cd /tmp ; echo OK");
channel_read(...)
channel_write(channel,"mkdir mytest ; echo OK");
...
basicaly that's like a shell script. Do not expect being able to parse
the "#" or "$" prompts, it won't work...

hope this helps.

Aris

Mark Hessling a écrit :
> I'm looking at libssh to enable the replacement of an existing
> application that uses raw sockets to control a telnet session. In future
> the connection must be done using ssh.
> 
> I tried modifying examples/exec.c and duplicated the block of code that
> calls channel_request_exec() to execute "ps aux" and to read the output.
> I simply added a call to channel_request_exec() to execute "ls -l", but
> I received an error: "Channel exec request failed".
> 
> Should I be able to with libssh, execute a shell command on the remote
> host, read its output and execute another shell command and read its
> output?
> 
>>From my reading of the documentation it appears that each call to
> channel_request_exec() spawns another shell on the remote server, so if
> I wanted to execute the following on the remote server:
> "cd tmp"
> "./run_my_command"
> then the second command would not be executed in the "tmp" directory.
> 
> Does libssh then need a "changedirectory" function similar to the one
> that sets environment variables?
> 
> Thanks in advance for your responses.
>