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POClient-Server 2 way communication unsuccessful (Perl)
 

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  1. POClient-Server 2 way communication unsuccessful (Perl)
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    <p><strong>REQ FLOW :</strong></p> <pre><code>____________ LOGIN ___________ | |-------------------&gt;&gt;| | | CLIENT | LOGIN ACK | SERVER | |__________|&lt;&lt;------------------ |__________| </code></pre> <p>The client and the server sends across the contents of the files they open.</p> <p><strong>CODE:</strong></p> <p><strong><em>SERVER</em></strong> </p> <pre><code>$socket = new IO::Socket::INET ( LocalHost =&gt; '127.0.0.1', LocalPort =&gt; '0155', Proto =&gt; 'tcp', Listen =&gt; 1, Reuse =&gt; 1 ) or die "Oops: $! \n"; print "Waiting for the Client.\n"; while($clientsocket = $socket-&gt;accept()){ print "Connected from : ", $clientsocket-&gt;peerhost(); print ", Port : ", $clientsocket-&gt;peerport(), "\n"; while(&lt;$clientsocket&gt;){ if($_ ne "\$END\$\n"){ print"Message received from Client : $_"; print $clientsocket $_; } else{ print"\$END\$\n"; } } last; } login_ack(); sub login_ack{ # Some code removed for the purpose of posting open (LOGINACK, "login_ack.txt") || die "Cannot open login acknowledgment file $!\n"; my @loginack=&lt;LOGINACK&gt;; close LOGINACK; open(LOG, "&gt;&gt;logfile.txt"); foreach $loginack(@loginack) { if($loginack ne "\$END\$\n"){ print $clientsocket $loginack; print LOG $loginack; print $loginack; } else{ print"\$END\$\n"; } } </code></pre> <p><strong><em>CLIENT</em></strong></p> <pre><code>$socket = new IO::Socket::INET ( PeerHost =&gt; '127.0.0.1', PeerPort =&gt; '0155', Proto =&gt; 'tcp', Reuse =&gt; 1) or die "$!\n"; print "Connected to the Server.\n"; send_login(); sub send_login{ # Some code removed for the purpose of posting open (LOGIN, "Login.txt") || die "Cannot open login file $!\n"; my @login=&lt;LOGIN&gt;; close LOGIN; open(LOG, "&gt;&gt;logfile.txt"); foreach $login(@login) { if($login ne "\$END\$\n"){ print $socket $login; print LOG $login; print $login; } else{ print"\$END\$\n"; } } } LOGINACK : while(&lt;$socket&gt;){ print"Message received from Server : $_"; print $socket $_; last LOGINACK; } </code></pre> <p><strong>PRESENT OUTPUT:</strong></p> <p><img src="https://i.stack.imgur.com/A1jHC.png" alt="enter image description here"></p> <p><strong>DESIRED OUTPUT:</strong></p> <p><strong><em>CLIENT</em></strong></p> <pre><code>Connected to the Server. this is Login SAS4 50 SAS_ACTION LOGIN LOGIN bss PASSWORD cleint $END$ Message received from Server : this is Login Ack Message received from Server : SAS4 Message received from Server : 61 Message received from Server : SAS_ACTION LOGIN_ACK Message received from Server : ACK_STATUS 0 Message received from Server : ACK_MESSAGE Logged In Message received from Server : $END$ </code></pre> <p><strong><em>SERVER</em></strong></p> <pre><code>Waiting for the Client. Connected from : 127.0.0.1, Port : 1862 Message received from Client : this is Login Message received from Client : SAS4 Message received from Client : 50 Message received from Client : SAS_ACTION LOGIN Message received from Client : LOGIN bss Message received from Client : PASSWORD cleint Message received from Client : $END$ this is Login Ack SAS4 61 SAS_ACTION LOGIN_ACK ACK_STATUS 0 ACK_MESSAGE Logged In $END$ </code></pre>
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    1. USSahej Narang
    1. USSahej Narang
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. PO
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    2. PO
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      1. POClient-Server 2 way communication unsuccessful (Perl)
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      1. VTDownMod
    2. VO
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      1. POClient-Server 2 way communication unsuccessful (Perl)
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    1. COBy the way, `while (...) { ...; last }` is a silly way of writing `if (...) { ... }`
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      1. POClient-Server 2 way communication unsuccessful (Perl)
      1. USikegami
    2. COIO::Socket::INET->new returns the error in `$@`, not `$!`.
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      1. POClient-Server 2 way communication unsuccessful (Perl)
      1. USikegami
    3. COAre you really running your server on privileged port `0155` (which is octal; the port number is 109 decimal)? So you're running as `root`? Ick, and likewise yuck! Especially while you're developing, use a non-privileged port (number bigger than 1023) and don't run as root unless you have to.
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      1. POClient-Server 2 way communication unsuccessful (Perl)
      1. USJonathan Leffler
 

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