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POTelnet IAC commands (NSStream socket)
 

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  1. POTelnet IAC commands (NSStream socket)
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    <p>I've made a <code>NSStream</code> socket to connect to a telnet server. Actually, it can connect fine to the server; I got an <code>inputStream</code> with the "first words" of the server, but I don't understand it. I'm looking for some explanations about the telnet IAC commands.</p> <p>Here is my code to receive from the server:</p> <pre><code> case NSStreamEventHasBytesAvailable: if (theStream == inputStream) { uint8_t buffer[1024]; int len; while ([inputStream hasBytesAvailable]) { len = [inputStream read:buffer maxLength:sizeof(buffer)]; if (len &gt; 0) { NSString * serverSaid = [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding]; if (nil != serverSaid) { NSLog(@"The server said: %@", serverSaid); [connectLog insertText:serverSaid]; [connectLog insertText:@"\r"]; } } } } break; </code></pre> <p>It is based on the EventHasBytesAvailable. It is working fine (got the hello from server with the login prompt).</p> <p>Now, to send to the server, I do this:</p> <pre><code>NSString * theMsg = [NSString stringWithFormat:@"root"]; NSData * msgToSend = [[NSData alloc] initWithData:[theMsg dataUsingEncoding:NSUTF8StringEncoding]]; [outputStream write:[msgToSend bytes] maxLength:[msgToSend length]]; </code></pre> <p>I scripted the output on a button, to see what happen when I use the outputstream: EventHasBytesAvailable catch my output has input... The server is telling me what I told him!</p> <p>Can someone explain to me the IAC commands and/or how to to proceed to login on the server and send commands?</p>
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    1. USGareth McCaughan
    1. USCindy Broutin
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    1. COCould you try to clarify the paragraph that begins "I scripted the output on a button"? I'm having trouble working out what it means. (Does it mean: what you sent to the server is being received back by your client in its `EventHasBytesAvailable` handler, because the server is sending back a copy of everything you send to it?)
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      1. POTelnet IAC commands (NSStream socket)
      1. USGareth McCaughan
    2. COI scripted the data which I want to send to the server on a button. When I press it, the EventHasBytesAvalaible which catch what the server say sends me a copy of what I sent. This is why I'm sure that the server receives my data. Now I have to send commands which the server understand (user/pw for the login prompt) and then commands (which is the thing that is interesting me ^^)...
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      1. POTelnet IAC commands (NSStream socket)
      1. USCindy Broutin
    3. COThanks. I don't know anything much about Telnet myself, but maybe someone will be along soon who does. The official specification of how to talk to a Telnet server is RFC 854 (http://www.apps.ietf.org/rfc/rfc854.html) together with RFC 855 (http://www.apps.ietf.org/rfc/rfc855.html), if that helps.
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      1. USGareth McCaughan
 

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