(Objective-C) SOCKS4 and SOCKS5 Proxy for FTP

Demonstrates how to connect to an FTP server through a SOCKS4 or SOCKS5 proxy. Both SSL/TLS and non-secure FTP communications may use SOCKS4 and SOCKS5 proxies.

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#import <CkoFtp2.h>
#import <NSString.h>

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

CkoFtp2 *ftp = [[CkoFtp2 alloc] init];

ftp.Hostname = @"ftp.example.com";
ftp.Username = @"login";
ftp.Password = @"password";

// To use a SOCKS4 or SOCKS5 proxy, simply set the following
// properties prior to connecting:
// The SOCKS hostname may be a domain name or 
// IP address:
ftp.SocksHostname = @"www.mysocksproxyserver.com";
ftp.SocksPort = [NSNumber numberWithInt:1080];
ftp.SocksUsername = @"myProxyLogin";
ftp.SocksPassword = @"myProxyPassword";
// Set the SOCKS version to 4 or 5 based on the version
// of the SOCKS proxy server:
ftp.SocksVersion = [NSNumber numberWithInt:5];
// Note: SOCKS4 servers only support usernames without passwords.
// SOCKS5 servers support full login/password authentication.

// Connect and login to the FTP server.
BOOL success = [ftp Connect];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

// Change to the remote directory where the file is located.
// This step is only necessary if the file is not in the root directory
// for the FTP account.
success = [ftp ChangeRemoteDir: @"junk"];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

// Download a file.
NSString *localFilename = @"c:/temp/hamlet.xml";
NSString *remoteFilename = @"hamlet.xml";

success = [ftp GetFile: remoteFilename localPath: localFilename];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

success = [ftp Disconnect];

NSLog(@"%@",@"File Downloaded!");