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(Objective-C) POP3 over Multiple Hop SSH

Demonstrates how to read POP3 email (using TCP or TLS) tunneled through mulitple-hop SSH. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2 => POP3Server

The ConnectThroughSsh and UseSsh methods are added in Chilkat version 9.5.0.55 to accomplish this task.

Chilkat Objective-C Library Downloads

MAC OS X (Cocoa) Libs

iOS Libs

#import "CkoSsh.h"
#import "CkoMailMan.h"
#import "CkoEmail.h"



//  Important: It is helpful to send the contents of the
//  ssh.LastErrorText property when requesting support.

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

//  Any string automatically begins a fully-functional 30-day trial.
BOOL success = [ssh1 UnlockComponent: @"Anything for 30-day trial"];
if (success != YES) {
    NSLog(@"%@",ssh1.LastErrorText);
    return;
}

//  Connect directly to the 1st SSH server.
success = [ssh1 Connect: @"serverssh1.com" port: [NSNumber numberWithInt: 22]];
if (success != YES) {
    NSLog(@"%@",ssh1.LastErrorText);
    return;
}

//  Authenticate using login/password:
success = [ssh1 AuthenticatePw: @"ssh1Login" password: @"ssh1Password"];
if (success != YES) {
    NSLog(@"%@",ssh1.LastErrorText);
    return;
}

//  Connect through the 1st SSH connection to reach a 2nd SSH server.
//  Note: Any number of SSH connections may be simultaneously tunneled through a single
//  existing SSH connection.
CkoSsh *ssh2 = [[CkoSsh alloc] init];
success = [ssh2 ConnectThroughSsh: ssh1 hostname: @"serverssh2.com" port: [NSNumber numberWithInt: 22]];
if (success != YES) {
    NSLog(@"%@",ssh2.LastErrorText);
    return;
}

//  Authenticate with ssh2...
success = [ssh2 AuthenticatePw: @"ssh2Login" password: @"ssh2Password"];
if (success != YES) {
    NSLog(@"%@",ssh2.LastErrorText);
    return;
}

CkoMailMan *mailman = [[CkoMailMan alloc] init];

//  Any string argument automatically begins the 30-day trial.
success = [mailman UnlockComponent: @"30-day trial"];
if (success != YES) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

//  Tell the mailman object to connect to the POP3 server though the ssh2 tunnel (which itself is routed through ssh1).
//  The connection looks like this:  Application => ServerSSH1 => ServerSSH2 => POP3Server
success = [mailman UseSsh: ssh2];
if (success != YES) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

//  Set the POP3 server's hostname
mailman.MailHost = @"pop.someMailServer.com";

//  Set the POP3 login/password.
mailman.PopUsername = @"myLogin";
mailman.PopPassword = @"myPassword";

//  Establish the POP3 connection through the ssh2 tunnel.
success = [mailman Pop3BeginSession];
if (success != YES) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

//  Get the number of messages in the mailbox.
int numMessages = [[mailman GetMailboxCount] intValue];

int i;
if (numMessages > 0) {

    CkoEmail *email = 0;
    for (i = 1; i <= numMessages; i++) {

        email = [mailman FetchByMsgnum: [NSNumber numberWithInt: i]];
        if (email == nil ) {
            NSLog(@"%@",mailman.LastErrorText);
            return;
        }
        else {
            NSLog(@"%@%@%@%@",email.From,@": ",email.Subject,@"\n");

        }

    }

}

//  Close the connection with the POP3 server.  (This closes the tunnel through ssh2)
//  The connection with ssh2 is still alive, and may be used for more connections.
success = [mailman Pop3EndSession];

//  Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
//  The connection with ssh1 is still alive, and may be used for more connections.
[ssh2 Disconnect];

[ssh1 Disconnect];

 

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