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(PowerShell) Multiple SendReqExec on Same ConnectionShows how to execute a series of commands on an SSH server and retrieve each command's output (using SendReqExec). Each call to SendReqExec requires its own logical channel. This is not a separate SSH connection -- it's simply a new session channel on the existing SSH connection.
Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll" # This example assumes the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. $ssh = New-Object Chilkat.Ssh # Hostname may be an IP address or domain: $hostname = "172.16.16.46" $port = 22 $success = $ssh.Connect($hostname,$port) if ($success -eq $false) { $($ssh.LastErrorText) exit } # If receiving output from a command stalls for more than 5 seconds, then stop waiting. $ssh.IdleTimeoutMs = 5000 # Authenticate using login/password: $success = $ssh.AuthenticatePw("myLogin","myPassword") if ($success -eq $false) { $($ssh.LastErrorText) exit } # Open a session channel. (It is possible to have multiple # session channels open simultaneously.) $channelNum = $ssh.OpenSessionChannel() if ($channelNum -lt 0) { $($ssh.LastErrorText) exit } # Request a directory listing on the remote server: # If your server is Linux/UNIX, change the string from "dir" to "ls" # Note: Some SSH servers require a CRLF instead of a bare-LF $cmd = "ls -al`n" $success = $ssh.SendReqExec($channelNum,$cmd) if ($success -eq $false) { $($ssh.LastErrorText) exit } # Read whatever output may already be available on the # SSH connection. ChannelReadAndPoll returns the number of bytes # that are available in the channel's internal buffer that # are ready to be "picked up" by calling GetReceivedText # or GetReceivedData. # A return value of -1 indicates failure. # A return value of -2 indicates a failure via timeout. # The ChannelReadAndPoll method waits # for data to arrive on the connection usingi the IdleTimeoutMs # property setting. Once the first data arrives, it continues # reading but instead uses the pollTimeoutMs passed in the 2nd argument: # A return value of -2 indicates a timeout where no data is received. $pollTimeoutMs = 2000 $n = $ssh.ChannelReadAndPoll($channelNum,$pollTimeoutMs) if ($n -lt 0) { $($ssh.LastErrorText) exit } # Close the channel: $success = $ssh.ChannelSendClose($channelNum) if ($success -eq $false) { $($ssh.LastErrorText) exit } # Perhaps we did not receive all of the commands output. # To make sure, call ChannelReceiveToClose to accumulate any remaining # output until the server's corresponding "channel close" is received. $success = $ssh.ChannelReceiveToClose($channelNum) if ($success -eq $false) { $($ssh.LastErrorText) exit } # Get the accumulated output of the command: $cmdOutput = $ssh.GetReceivedText($channelNum,"ansi") if ($ssh.LastMethodSuccess -eq $false) { $($ssh.LastErrorText) exit } # Display the remote shell's command output: $($cmdOutput) $("----") # ----------------------------------------------------------------- # Now for the 2nd SendReqExe (on the same connection, # but on a separate logical channel). # ----------------------------------------------------------------- $channelNum = $ssh.OpenSessionChannel() if ($channelNum -lt 0) { $($ssh.LastErrorText) exit } $cmd = "nslookup chilkatsoft.com`n" $success = $ssh.SendReqExec($channelNum,$cmd) if ($success -eq $false) { $($ssh.LastErrorText) exit } $pollTimeoutMs = 2000 $n = $ssh.ChannelReadAndPoll($channelNum,$pollTimeoutMs) if ($n -lt 0) { $($ssh.LastErrorText) exit } $success = $ssh.ChannelSendClose($channelNum) if ($success -eq $false) { $($ssh.LastErrorText) exit } $success = $ssh.ChannelReceiveToClose($channelNum) if ($success -eq $false) { $($ssh.LastErrorText) exit } $cmdOutput = $ssh.GetReceivedText($channelNum,"ansi") if ($ssh.LastMethodSuccess -eq $false) { $($ssh.LastErrorText) exit } $($cmdOutput) |
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