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Hey all, Ive been using a new SHH library to send commands to a unix server and its been working great for me. It sends normal commands just fine and recives the proper responses. However, I seem to be running into an issue when I try to use it to run a custom script (not a shell script, but a file that contains another command and has arguments)

Ive tried several ways to get this to work.

On the unix server itself the following commands work perfectly and do what they are intended:

  • cd script; script.oi someArg someArg - WORKS
  • csh -c "cd script; script.oi someArg someArg" - ALSO WORKS
  • cd /users/bin/script; script.oi someArg1 someArg 2 - WORKS
  • csh -c "cd /users/bin/script; script.oi someArg1 someArg 2" - WORKS
  • /users/bin/script/script.oi someArg1 someArg2 - WORKS

However, in the code I have tried the following:

string command = string.Format("csh -c \"cd script; script.oi {0} {1}\"", arg1, arg2); - DOES NOT WORK
string command = string.Format("cd script; script.oi {0} {1}", arg1, arg2); - DOES NOT WORK
string command = string.Format("cd /users/bin/script; script.oi {0} {1}", arg1, arg2); - DOES NOT WORK 
string command = string.Format("csh -c \"cd /users/bin/script; script.oi {0} {1}\"", arg1, arg2); - DOES NOT WORK 
string command = string.Format("/users/bin/script/script.oi {0} {1}", arg1, arg2); - DOES NOT WORK

So to me it seems like something else is going on. I did try the following:

string command = string.Format("csh -c \"ls\"", arg1, arg2);` - WORKS
string command = string.Format("ls", arg1, arg2);` - WORKS

It looks like it has to do with the fact that Im trying to run a custom script, or maybe some silly setting I've forgotten. Let me know if you need anymore details.

EDIT: By DOES NOT WORK, I mean that the result that is returned to the C# is supposed to say some stuff, but the result is blank. Additionaly, the script sends a TIBCO Rendevous message which eventually adds an entry to a DB, which is not showing up. When I say WORKS, I mean that the entry is showing up in the DB.

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  • What does DOES NOT WORK mean? Do you get an error message? Do you get an invalid result? I was just wondering if you maybe use arguments with spaces or invalid chars in case of the custom scripts? And: Which mode does script.oi have? 777? 755? Commented May 3, 2011 at 20:37
  • The results (output of the command) is blank, and the script is supposed to add an entry to a DB via sending a TIBCO Rendevous message, and that entry is never added. Not sure what you mean by the scripts mode.... all it is is the TIBCO Rendevous message with the arguments Commented May 3, 2011 at 20:44
  • Just the rights of the filesystem for script.oi. What does ls -al /users/bin/script/script.oi output? Commented May 3, 2011 at 20:49
  • Im a huge unix noob but when I ran that command I think what you're looking for is the beginning of it -rwx--x--x Commented May 3, 2011 at 20:52
  • Also, what are your values for arg1 and arg2? And which user do you use to login? Commented May 3, 2011 at 20:53

3 Answers 3

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Well, I figured it out. Turns out the script was running a command that is known to the unix server via being added to the unix eviroment variables. When just using the standard way to send commands in SSH.NET, the enviroment variables are not imported (which is why you are able to send normal commands like ls, grep, cat, ect, but not this one).

The fix was to use the libraries SSH shell functionality because it does import the enviroment variables, therefore it knows what that command in the script is and is able to run it. For those using this great library (which is still be activily developed, always a plus) I have included below example SSH.NET Shell code.

PasswordConnectionInfo connectionInfo = new PasswordConnectionInfo("some IP", "user", "pass");

try
{
    using (var client = new SshClient(connectionInfo))
    {
        client.Connect();
        var input = new MemoryStream(Encoding.ASCII.GetBytes(command));
        var shell = client.CreateShell(input, Console.Out, Console.Out, "xterm", 80, 24, 800, 600, "");
        shell.Stopped += delegate(object sender, EventArgs e)
        {
            Console.WriteLine("\nDisconnected...");
        };
        shell.Start();
        Thread.Sleep(1000);
        shell.Stop();
        client.Disconnect();
    }   
}
catch (Exception ex)
{
    // Exception stuff
}
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0

Does the user being logged on using the ssh client have execute privileges on the called executable?

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16 Comments

The user that is logged in on the actual Unix server when running those executables/scripts works is the same user/password I used for the login info on the SSH connection
Attempt running them with a different shell? Bash for instance?
Also it could be worth returning pwd which should let you see what directory your execution is going to happen in...
Actually better still, pipe the output of the command like this: script.oi a2test003 hed > output.txt
try running "touch output.txt" first. that should create the file.
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0

As the script should be executable by everyone there should be something wrong with the arguments. Get the generated command-String and try to execute it by yourself on a SSH-session (with something like PuTTY). If possible provide us the generated command. I assume there might be chars in it which need proper escaping.

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4 Comments

Even if the arguments are just strings it is possible that whitespaces and chars like < and > make problems.
Ah I see, well the current are something like script.oi A2TEST003 HED
Okay, that should not be a problem. Can you login with a SSH client like PuTTY ( chiark.greenend.org.uk/~sgtatham/putty ) and execute the command by typing it?
Okay connected via PuTTY with the same info and ran cd script; script.oi A2TEST003 HED and the entry did show up in the DB

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