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POIs it possible to create a read/write FileHandle for a system() call?
 

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  1. POIs it possible to create a read/write FileHandle for a system() call?
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    <p>I have a POP3 login test script which uses <code>IO::Socket::INET</code> to read and write to the opened socket on TCP:110. This is what I'm used to: -</p> <pre><code>my $sock = IO::Socket::INET-&gt;new( PeerAddr =&gt; "$h:$port", Proto =&gt; "tcp", ) or die "$!\n"; </code></pre> <p>However, I also need to test the same POP3 conversation through SSL-secured POP3S (TCP:995).</p> <p>I've found that I can use the following on the command-line, which gets me a similar state as "telnet hostname 110", but encrypted: -</p> <pre><code>openssl s_client -crlf -connect hostname:995 </code></pre> <p>I am hoping to find a way that I can set up some sort of read/write FileHandle or socket on the openssl command, which I can read til it's empty, then write in the required POP3 commands into, then read the responses, and so on...</p> <p>I feel like because I can see it on screen, it's close enough to grab, but I don't quite know my way around perl well enough, to "get it" and move on!</p> <p>Unfortunately, the server this script will be run on, is not able to have more perl modules installed, which might have been an obvious solution.</p> <p><em>UPDATE</em></p> <p>Thanks to @ventatsu for the inspiration, I am now using <code>IPC::Open2</code> like this: -</p> <pre><code>my ($sslread,$sslwrite); my $ssl_fh = open2( $sslread, $sslwrite, "openssl s_client -crlf -connect mail.example.com:995" ) or die "$!\n"; while (&lt;$sslread&gt;) { print; if (/^\+OK.*$/) { ## Try to log in print $sslwrite "USER $u\r\n"; print "USER $u\n"; while (&lt;$sslread&gt;) { print; if (/^\+OK.*$/) { ## Keep going print $sslwrite "PASS $p\r\n"; print "PASS $p\n"; while (&lt;$sslread&gt;) { print; } } } print $sslwrite "QUIT"; print "QUIT\n"; } } waitpid( $ssl_fh, 0 ); my $child_exit_status = $? &gt;&gt; 8; </code></pre> <p>My non-SSL test scrip works thusly: -</p> <pre><code>Testing pop3 on mail.example.com:110 +OK The Microsoft Exchange POP3 service is ready. USER mailtest@example.com +OK PASS Abcd3fGh +OK User successfully logged on. </code></pre> <p>The credentials work OK when I run the POP3 commands in an interactive SSL session on the CLI like this: -</p> <pre><code>openssl s_client -crlf -connect mail.example.com:995 &lt;snip out the SSL bumph /&gt; +OK The Microsoft Exchange POP3 service is ready. USER mailtest@example.com +OK PASS Abcd3fGh +OK User successfully logged on. </code></pre> <p>But my SSL test script only almost works thusly: -</p> <pre><code>Testing pop3s on mail.example.com:995 &lt;snip out the SSL bumph /&gt; +OK The Microsoft Exchange POP3 service is ready. USER mailtest@example.com +OK PASS Abcd3fGh -ERR Logon failure: unknown user name or bad password. </code></pre> <p>What am I doing wrong?</p>
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