Objective-C

Open a Custom SSH Channel Type

Demonstrates the Chilkat Ssh.OpenCustomChannel method, which requests a channel whose application-defined type is supplied as the only argument. It returns the channel number, or -1 if the server rejects the channel. The server must implement that channel type.

Background: The SSH protocol allows vendor- and application-specific channel types beyond the standard session and direct-tcpip kinds; by convention these carry an @domain suffix to avoid name collisions. This method is the escape hatch for talking to a server that implements such a type. On rejection, inspect ChannelOpenFailCode to learn why.

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Objective-C

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

BOOL success = NO;

//  Demonstrates the Ssh.OpenCustomChannel method, which requests a custom SSH channel whose
//  application-defined type is supplied as the only argument.  It returns the channel number,
//  or -1 if the server rejects the channel.  The server must implement that channel type.

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

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

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
NSString *password = @"mySshPassword";

success = [ssh AuthenticatePw: @"mySshLogin" password: password];
if (success == NO) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

//  Request an application-defined channel type.  The server must support it.
NSString *channelType = @"my-custom-channel@example.com";
int channelNum = [[ssh OpenCustomChannel: channelType] intValue];
if (channelNum < 0) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Opened custom channel: ",channelNum);

//  The channel is used with the normal channel send, receive, EOF, CLOSE, and release methods.

[ssh Disconnect];