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Visual FoxPro Examples

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(Visual FoxPro) SSH Remote Shell

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

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

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

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

loSsh = CreateObject('Chilkat_9_5_0.Ssh')

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

* Connect to an SSH server:
lnSuccess = loSsh.Connect(lcHostname,lnPort)
IF (lnSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Wait a max of 5 seconds when reading responses..
loSsh.IdleTimeoutMs = 5000

* 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

* Some SSH servers require a pseudo-terminal
* If so, include the call to SendReqPty.  If not, then 
* comment out the call to SendReqPty.
* Note: The 2nd argument of SendReqPty is the terminal type,
* which should be something like "xterm", "vt100", "dumb", etc.
* A "dumb" terminal is one that cannot process escape sequences.
* Smart terminals, such as "xterm", "vt100", etc. process
* escape sequences.  If you select a type of smart terminal,
* your application will receive these escape sequences
* included in the command's output.  Use "dumb" if you do not
* want to receive escape sequences.  (Assuming your SSH
* server recognizes "dumb" as a standard dumb terminal.)
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

* Start a command in the remote shell.  This example
* will send a "ls" command to retrieve the directory listing.
lnSuccess = loSsh.ChannelSendString(lnChannelNum,"ls" + 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

* Let's pickup the accumulated output of the command:
lcCmdOutput = loSsh.GetReceivedText(lnChannelNum,"ansi")
IF (loSsh.LastMethodSuccess <> 1) THEN
    ? loSsh.LastErrorText
    RELEASE loSsh
    CANCEL
ENDIF

* Display the remote shell's command output:
? lcCmdOutput

* Disconnect
loSsh.Disconnect()

RELEASE loSsh


 

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