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Ruby Examples

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(Ruby) SSH Tunnel (Port Forwarding via direct-tcpip channel)

Demonstrates how to create an SSH tunnel to a remote hostname:port via a direct-tcpip channel.

Chilkat Ruby Downloads

Ruby Library for Linux and MAC OS X

require 'chilkat'

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

ssh = Chilkat::CkSsh.new()

# Connect to an SSH server:

# Hostname may be an IP address or hostname:
hostname = "192.168.1.117"
port = 22

success = ssh.Connect(hostname,port)
if (success != true)
    print ssh.lastErrorText() + "\n";
    exit
end

# Wait a max of 5 seconds when reading responses..
ssh.put_IdleTimeoutMs(5000)

# Authenticate using login/password:
success = ssh.AuthenticatePw("chilkat","myPassword")
if (success != true)
    print ssh.lastErrorText() + "\n";
    exit
end

# Open a direct-tcpip channel.  We want the SSH server to connect
# to www.chilkatsoft.com, port 80 (i.e. the web server).
# Data sent through the SSH tunnel is forwarded to the remote
# host:port.  (Note: The remote host:port does not need to be 
# a web server.  It can be anything.  It can be your own
# customer application server that listens on a port, or any
# other type of server.)
# When we read from the SSH channel, we'll be reading data
# sent from the remote host:port (i.e. the web server in this
# example).

channelNum = ssh.OpenDirectTcpIpChannel("www.chilkatsoft.com",80)
if (channelNum < 0)
    print ssh.lastErrorText() + "\n";
    exit
end

# Build a simple HTTP GET request for http://www.chilkatsoft.com/xyz.html
httpReq = "GET /xyz123.html HTTP/1.1\r\nHost: www.chilkatsoft.com\r\n\r\n"

# Send the HTTP request:
success = ssh.ChannelSendString(channelNum,httpReq,"ansi")
if (success != true)
    print ssh.lastErrorText() + "\n";
    exit
end

# Get the HTTP response.
# First read the HTTP response header which ends with a double CRLF.
# Calling ChannelReceiveUntilMatch will receive until match string is seen,
# or until a timeout occurs (IdleTimeoutMs property).  ChannelReceiveUntilMatch
# may read beyond the match string, but it will stop reading as soon as the match
# string is seen.
caseSensitive = false
matchStr = "\r\n\r\n"
success = ssh.ChannelReceiveUntilMatch(channelNum,matchStr,"ansi",caseSensitive)
if (success != true)
    print ssh.lastErrorText() + "\n";
    exit
end

# Extract the HTTP header from the receive buffer.
# (GetReceiveTextS extracts up to and including the match string from the receive buffer)

responseHeader = ssh.getReceivedTextS(channelNum,matchStr,"ansi")
print "---- HTTP Response Header ----" + "\n";
print responseHeader + "\n";

# Now get the body of the HTTP response (this is the HTML content
# of http://www.chilkatsoft.com/xyz.html
# It's possible we've already received the entire HTTP response in the
# call to ChannelReceiveUntilMatch.  Therefore, we'll poll for any remaining data
# and wait a max of .2 seconds.

pollTimeoutMs = 200
numBytesRead = ssh.ChannelPoll(channelNum,pollTimeoutMs)
# We're not checking for an error here.
# A return value of -2 means that no data was available and the poll simply timed out (not an error)
# A return value of -1 indicates an error.
# A return value greater than 0 indicates that additional data was received.

print "---- HTML BODY ----" + "\n";

# Extract the remainder of the accumulated data in the internal receive buffer.
# This should be our HTML body:

htmlBody = ssh.getReceivedText(channelNum,"ansi")
print htmlBody + "\n";

# Close the channel:
success = ssh.ChannelSendClose(channelNum)
if (success != true)
    print ssh.lastErrorText() + "\n";
    exit
end

# Disconnect
ssh.Disconnect()

 

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