Hi All,

Sorry to reposting the similar question.
I was going through socket programing, got a doubt, what is the difference between udp client and server? Suppose if i need to listen in my machine for a perticular port (40150 - which will have x amounts of udp packets coming in from a server - direct push) how can i code this on Perl?
i have written this code 



# $IP will have the actual ip from where packets are coming in 
        system(" tcpdump -v -i eth1 dst $IP > file.txt & ");
        my $GREP=`ps aux | grep  'tcpdump ' | grep -v grep | awk '{pri
+nt \$2}'`;
        chomp($GREP);
        print "PID for |$IP| IS -->|$GREP|\n";
        print "SLEEEPING FOR 5 seconds....\n";
        sleep(5);
        chomp($GREP);
        print "KILLING PROCESS ID  ------->|$GREP|\n";
        system("kill -9 $GREP");
        my $LINES=`wc -l $path\/file.txt | awk '{ print \$1}'`;
        chomp($LINES);
        if($LINES > 5) {
       # I have ip coming in
        } else {
       # Looks like ip with udp packets is not coming in 
        }
}

[download]

This subroutine tests given ip is listed on tcpdump, It works great, but i don't want to use tcpdump or any unix related tools (awk, grepm, kill etc). Looks like this is using huge amount of memory. Is there any way i can write this using socket programing?
Any hint ???

Thanks.

In reply to What is the difference between udp client and server? by shekarkcb

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.