(Objective-C) Multiple Hop SSH to SFTP

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.

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#import <CkoSsh.h>
#import <NSString.h>
#import <CkoSFtp.h>

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

CkoSsh *ssh1 = [[CkoSsh alloc] init];

// Hostname may be an IP address or domain name:
NSString *hostname = @"192.168.1.111";
NSString *port = 22;

// Connect directly to the 1st SSH server:
BOOL success = [ssh1 Connect: hostname port: port];
if (success != YES) {
    NSLog(@"%@",ssh1.LastErrorText);
    return;
}

// Authenticate using login/password:
success = [ssh1 AuthenticatePw: @"myLogin" password: @"myPassword"];
if (success != YES) {
    NSLog(@"%@",ssh1.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.
CkoSFtp *sftp = [[CkoSFtp alloc] init];

// Connect to some SSH/SFTP server through ssh1.
success = [sftp ConnectThroughSsh: ssh1 hostname: @"sftp.someremoteserver.com" port: [NSNumber numberWithInt: 22]];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Authenticate with the SFTP server. 
success = [sftp AuthenticatePw: @"myLogin" password: @"myPassword"];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// After authenticating, the SFTP subsystem must be initialized:
success = [sftp InitializeSftp];
if (success != YES) {
    NSLog(@"%@",sftp.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;
NSString *remoteFilePath = @"hamlet.xml";
NSString *localFilePath = @"c:/temp/hamlet.xml";

success = [sftp UploadFileByName: remoteFilePath localFilePath: localFilePath];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

NSLog(@"%@",@"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];