Objective-C

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.

Objective-C

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

BOOL success = NO;

//  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:
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];