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copied!<p>Sure, it's easily possible! It's a pretty basic TCP protocol.</p> <p>GCC is just a compiler (and a linker). There is no direct connection between GCC and IRC.<br> To connect to the server and communicate with it, you just need <code>sys/socket.h</code>; I won't go in details, there's a lot of examples and tutorials about server-client linux C/C++ programs.</p> <p>Let's see and try to understand the IRC protocol using <code>telnet</code> (a command-line telnet client program).</p> <p>First, we need to establish connection to the server (let's say it's <code>irc.freenode.net</code> with the default port, <code>6667</code>):</p> <pre><code>$ telnet irc.freenode.net 6667 </code></pre> <p>The server replies with:</p> <pre><code>:sturgeon.freenode.net NOTICE * :*** Looking up your hostname... :sturgeon.freenode.net NOTICE * :*** Checking Ident :sturgeon.freenode.net NOTICE * :*** No Ident response :sturgeon.freenode.net NOTICE * :*** Couldn't look up your hostname </code></pre> <p>Now we need to send three things: <code>PASS</code>, <code>USER</code> and <code>NICK</code>.</p> <p><code>PASS</code> is a command that sends a connection password. On the public servers (which doesn't have any password) you may send <code>PASS none</code>. </p> <p><code>USER</code> is a command that tells the server your username, host name and real name. Like, when you <code>whois</code> someone, you see <code>username@1.2.3.4</code> and his "Real Name". That data the client sends just after establishing the connection.</p> <p><code>NICK</code> is a command to set your nickname. Of course the server should know your nickname, so you should sent it right after connection too! </p> <p>So, we established a connection. Now you have to send those commands, just type them into telnet:</p> <pre><code>PASS none NICK sorandom29 USER blah blah blah blah </code></pre> <p>Woohoo, we've got an answer!</p> <pre><code>:lindbohm.freenode.net 001 sorandom29 :Welcome to the freenode Internet Relay Chat Network sorandom29 </code></pre> <p>Another important thing - there are <code>PING</code> and <code>PONG</code> commands, so if you don't answer the server with a <code>PONG</code> for a long time, you get disconnected.</p> <p>Let's see how it's done. We get a PING request:</p> <pre><code>PING :lindbohm.freenode.net </code></pre> <p>And then just answer it with the same parameters:</p> <pre><code>PONG :lindbohm.freenode.net </code></pre> <p>Then, you might wonder how could you join a channel.</p> <pre><code>JOIN #linux </code></pre> <p>Yeah, that's it.</p> <pre><code>:lindbohm.freenode.net 470 sorandom29 #linux ##linux :Forwarding to another channel :sorandom29!~blah JOIN ##linux :lindbohm.freenode.net 332 sorandom29 ##linux :Welcome to ##Linux! Freenode's general Linux support/discussion channel. </code></pre> <p>Another command is <code>PRIVMSG</code>, it sends an actual message to the channel or somebody else:</p> <pre><code>PRIVMSG #linux :hello guys! i'm using telnet to connect to irc and that's such a stupid idea, i have to respond to PINGs manually! </code></pre> <p>So everybody on <code>#linux</code> will see that:</p> <pre><code><sorandom29> hello guys! i'm using telnet to connect to irc and that's such a stupid idea, i have to respond to PINGs manually! </code></pre> <p>Note that a <code>:</code> is a prefix before the message itself.</p> <p>I guess that's enough to get into IRC. The whole lot of other stuff you can try yourself just by reading about <a href="http://tools.ietf.org/html/rfc1459" rel="noreferrer">IRC protocol</a> itself, trying things with <code>telnet</code> or <code>nc</code> and then getting into coding a program using the basic sockets.</p>

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