(Visual FoxPro) SSH Remote Shell Multiple Commands

Demonstrates how to start a shell on a remote SSH server, run a command, and retrieve the output, then run the next command, retrieve the output, etc.

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LOCAL loSsh
LOCAL lcMyPrompt
LOCAL lcCmdOutput
LOCAL lcHostname
LOCAL lnPort
LOCAL lnSuccess
LOCAL lnChannelNum
LOCAL lcTermType
LOCAL lnWidthInChars
LOCAL lnHeightInChars
LOCAL lnPixWidth
LOCAL lnPixHeight
LOCAL n
LOCAL lnPollTimeoutMs

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Ssh')
loSsh = CreateObject('Chilkat.Ssh')

* This is the prompt we'll be expecting to find in
* the output of the remote shell.

lcMyPrompt = "chilkat@ubuntu:~/workspace$"

* Connect to an SSH server:

* Hostname may be an IP address or hostname:
lcHostname = "www.some-ssh-server.com"
lnPort = 22

lnSuccess = loSsh.Connect(lcHostname,lnPort)
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Wait a max of 10 seconds when reading responses..
loSsh.IdleTimeoutMs = 10000

* Authenticate using login/password:
lnSuccess = loSsh.AuthenticatePw("myLogin","myPassword")
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Open a session channel.  (It is possible to have multiple
* session channels open simultaneously.)

lnChannelNum = loSsh.OpenSessionChannel()
IF (lnChannelNum < 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

lcTermType = "dumb"
lnWidthInChars = 120
lnHeightInChars = 40
* Use 0 for pixWidth and pixHeight when the dimensions
* are set in number-of-chars.
lnPixWidth = 0
lnPixHeight = 0
lnSuccess = loSsh.SendReqPty(lnChannelNum,lcTermType,lnWidthInChars,lnHeightInChars,lnPixWidth,lnPixHeight)
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Start a shell on the channel:
lnSuccess = loSsh.SendReqShell(lnChannelNum)
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

*  Run the 1st command in the remote shell, which will be to
*  "cd" to a subdirectory.
lnSuccess = loSsh.ChannelSendString(lnChannelNum,"cd workspace" + CHR(13) + CHR(10),"ansi")
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Retrieve the output.
lnSuccess = loSsh.ChannelReceiveUntilMatch(lnChannelNum,lcMyPrompt,"ansi",1)
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

*  Display what we've received so far.  This clears
*  the internal receive buffer, which is important.
*  After we send the command, we'll be reading until
*  the next command prompt.  If the command prompt
*  is already in the internal receive buffer, it'll think it's
*  already finished...
lcCmdOutput = loSsh.GetReceivedText(lnChannelNum,"ansi")
IF (loSsh.LastMethodSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

? lcCmdOutput

*  Run the 2nd command in the remote shell, which will be
*  to "ls" the directory.
lnSuccess = loSsh.ChannelSendString(lnChannelNum,"ls" + CHR(13) + CHR(10),"ansi")
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Retrieve and display the output.
lnSuccess = loSsh.ChannelReceiveUntilMatch(lnChannelNum,lcMyPrompt,"ansi",1)
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

lcCmdOutput = loSsh.GetReceivedText(lnChannelNum,"ansi")
IF (loSsh.LastMethodSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

? lcCmdOutput

*  Start the final command in the remote shell.  This example
*  will send a "ls -l" command to retrieve the long format directory listing.
lnSuccess = loSsh.ChannelSendString(lnChannelNum,"ls -l" + CHR(13) + CHR(10),"ansi")
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Send an EOF.  This tells the server that no more data will 
* be sent on this channel.  The channel remains open, and
* the SSH client may still receive output on this channel.
lnSuccess = loSsh.ChannelSendEof(lnChannelNum)
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* 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.

lnPollTimeoutMs = 2000
n = loSsh.ChannelReadAndPoll(lnChannelNum,lnPollTimeoutMs)
IF (n < 0) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Close the channel:
lnSuccess = loSsh.ChannelSendClose(lnChannelNum)
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* 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.
lnSuccess = loSsh.ChannelReceiveToClose(lnChannelNum)
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

lcCmdOutput = loSsh.GetReceivedText(lnChannelNum,"ansi")
IF (loSsh.LastMethodSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

? lcCmdOutput

* Disconnect
loSsh.Disconnect()

RELEASE loSsh