Classic ASP

SSH Exec (Execute Command Line)

Demonstrates running a single command on an SSH server with an exec request and retrieving its output. The example connects, authenticates, opens a session channel, sends the command, reads until the server closes the channel, and then checks the exit status.

Background: exec is the workhorse of SSH automation: it runs one command and the server closes the channel when the command exits, which is a definitive end-of-output signal. No PTY is involved, so the shell runs non-interactively — no prompt, no echoed input, no ANSI escape codes — giving clean, parseable output. Remember that an accepted exec request only means the request was accepted; the command's own success is reported through the channel exit status. Command syntax depends on the remote shell, which is the user's default shell on Linux/UNIX and usually CMD.EXE on Windows SSH servers.

Chilkat Classic ASP Downloads

Download Chilkat for Classic ASP

Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

'  Demonstrates running a single command on an SSH server with an exec request and retrieving
'  its output.  An exec request runs one command and the server closes the channel when it
'  finishes -- no PTY and no shell prompt are involved, so the output is clean and parseable.

set ssh = Server.CreateObject("Chilkat.Ssh")

'  The hostname may be a hostname or an IP address.
hostname = "ssh.example.com"
port = 22
success = ssh.Connect(hostname,port)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( ssh.LastErrorText) & "</pre>"
    Response.End
End If

'  Normally you would not hard-code the password in source.  You should instead obtain it
'  from an interactive prompt, environment variable, or a secrets vault.
password = "mySshPassword"

success = ssh.AuthenticatePw("mySshLogin",password)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( ssh.LastErrorText) & "</pre>"
    Response.End
End If

'  Open a session channel.  Several session channels may be open at once on one connection.
channelNum = ssh.OpenSessionChannel()
If (channelNum < 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( ssh.LastErrorText) & "</pre>"
    Response.End
End If

'  The command syntax depends on the remote system's shell.  On Linux/UNIX it is typically the
'  user's default shell; on Windows SSH servers it is usually CMD.EXE.
'    Linux/UNIX:  "ls -l /tmp"        or  "cd /etc; ls -la"
'    Windows:     "dir"               or  "\"cd \\temp&&dir\""
success = ssh.SendReqExec(channelNum,"ls -l /tmp")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( ssh.LastErrorText) & "</pre>"
    Response.End
End If

'  IMPORTANT: Set a read timeout.  ReadTimeoutMs defaults to 0, which means no limit -- without
'  it, this call waits forever if the server never sends channel close.
ssh.ReadTimeoutMs = 15000

'  Read the output until the server sends channel close, which happens when the command exits.
success = ssh.ChannelReceiveToClose(channelNum)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( ssh.LastErrorText) & "</pre>"
    Response.End
End If

cmdOutput = ssh.GetReceivedText(channelNum,"utf-8")
If (ssh.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( ssh.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( cmdOutput) & "</pre>"

'  An accepted exec request does not mean the command succeeded.  Check the exit status.
If (ssh.ChannelReceivedExitStatus(channelNum)) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Exit status: " & ssh.GetChannelExitStatus(channelNum)) & "</pre>"
End If

ssh.Disconnect 

%>
</body>
</html>