Objective-C

Connect to an SSH Server

Demonstrates the Chilkat Ssh.Connect method, which establishes a connection to an SSH server. The first argument is the hostname (a DNS name or a numeric IPv4/IPv6 address) and the second is the TCP port, usually 22. Connecting is the first step; authentication follows before any channels can be opened.

Background: Connect establishes only the SSH transport — the encrypted channel and host-key exchange — but does not log in. An SSH session is always used in stages: connect, authenticate, then open one or more channels for shell, exec, or port-forwarding work. Timeouts and optional SOCKS/HTTP proxying are controlled by the object's properties before this call.

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Objective-C

#import <CkoSsh.h>

BOOL success = NO;

//  Demonstrates the Ssh.Connect method, which establishes a connection to an SSH server.  The
//  1st argument is the hostname (a DNS name or numeric IP) and the 2nd is the TCP port.

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

//  Port 22 is the usual SSH port.
int sshPort = 22;
success = [ssh Connect: @"ssh.example.com" port: [NSNumber numberWithInt: sshPort]];
if (success == NO) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

NSLog(@"%@",@"Connected to the SSH server.");

//  (Authentication would follow here before opening channels.)

[ssh Disconnect];