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POSend() message include some field in TCP socket (C Linux)
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  1. POSend() message include some field in TCP socket (C Linux)
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    copied!<p>System include some clients and server. Client send message to server have 3 types of message:</p> <ul> <li>Connection setup: User type command-line: remote-chat <code>&lt;IP addr server&gt;</code>: <code>&lt;port addr server&gt;</code> <code>&lt;IP address client&gt;</code>: <code>&lt;port addr client&gt;</code>, a link TCP connection will be established between the client and server chat. After the TCP connection is set, the client sends the connection setup information, including some fields: <ul> <li>The message identifier: is a 32-bit integer. With Connection setup message, this field equal to 0.</li> <li>Field IP address of client 2 (client 1 call), Port address of client 2.</li> </ul></li> </ul> <p>Server receive this message. Then create a connection to client 2.</p> <ul> <li>Data exchange: used to exchange data between client and server. Include some fields: <ul> <li>The message identifier: is a 32-bit integer. With Data exchange message this field = 1</li> <li>The data length: an integer indicating the length of the text message.</li> <li>The data text field: contains text messages to exchange.</li> </ul></li> </ul> <p>When receiving data sent from client 1, chat server transfer text messages from client 1 to client 2 (client 2 also using data exchange message).</p> <p><strong>So my question is: how do I send the message with some field? I already know send string by function send(). Here I have to send message Connection Setup or Data exchange with some field then I whether used pack in client side then unpack in server side or not? Please give me some solution for this problem?</strong></p> <p>I think use:</p> <pre><code>typedef struct _ConnectionSetup_Message { int message_ID; // 0 ConnectionSetup message unsigned int Port; unsigned shor IP; } HELLO_Message; typedef struct _DataExchange_Message { int message_Length; int message_ID; // 1 for DataExchange message char *text; } DataExchange_Message; </code></pre>
 

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