Dart

Multiple Hop SSH to SFTP

See more SFTP Examples

Demonstrates how to SFTP through an intermediate SSH server (multiple hop). The scheme looks like this:

Application => ServerSSH1 => ServerSFtp

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final ssh1 = CkSsh();

  // Hostname may be an IP address or domain name:
  final hostname = '192.168.1.111';
  final port = 22;

  // Connect directly to the 1st SSH server:
  try {
    ssh1.connect(hostname, port);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Authenticate using login/password:
  try {
    ssh1.authenticatePw('myLogin', 'myPassword');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Connect through the 1st SSH connection to reach a 2nd SSH server (for SFTP)
  // Note: Any number of connections may be simultaneously tunneled through a single
  // existing SSH connection.
  final sftp = CkSFtp();

  // Connect to some SSH/SFTP server through ssh1.
  try {
    sftp.connectThroughSsh(ssh1, 'sftp.someremoteserver.com', 22);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Authenticate with the SFTP server. 
  try {
    sftp.authenticatePw('myLogin', 'myPassword');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // After authenticating, the SFTP subsystem must be initialized:
  try {
    sftp.initializeSftp();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Upload from the local file to the SSH server.
  // Important -- the remote filepath is the 1st argument,
  // the local filepath is the 2nd argument;
  final remoteFilePath = 'hamlet.xml';
  final localFilePath = 'c:/temp/hamlet.xml';

  try {
    sftp.uploadFileByName(remoteFilePath, localFilePath);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Success.');

  // Close the connection with the SFTP server.(This closes the the tunnel through ssh1.)
  // The connection with ssh1 is still alive, and may be used for more connections.
  sftp.disconnect();

  // ...
  // ...
  // ...

  ssh1.disconnect();
}