Apache - read from socket problem

Stetec has asked for the wisdom of the Perl Monks concerning the following question:

I am running RT 4.4.2 on Apache/2.4.25. I want to make a GET request to server from my custom page inside RT. Here is the relevant part of code:

#!/usr/bin/perl

use strict;
use warnings;
use IO::Socket::SSL 'debug3';
use LWP::UserAgent;
use LWP::ConsoleLogger::Everywhere ();
use JSON;

BEGIN {
    $ENV{HTTPS_DEBUG} = 1; 
    $ENV{PERL_NET_HTTPS_SSL_SOCKET_CLASS} = 'IO::Socket::SSL'; # force
+ LWP::UserAgent to use Net::SSL in case that IO::Socket::SSL is insta
+lled too
}

sub log_list
{
    my $par = shift;
    my $list = shift;

    my $query = "https://server.com/script.cgi?action=aaa&par=" . $par
+ . "&";
    my $ua = LWP::UserAgent->new();

    $ua->ssl_opts(
        SSL_cert_file   => '/path/to/cert',
        SSL_key_file    => '/path/to/key',
        SSL_version     => 'TLSv1_2',
        verify_hostname => 0,       
    );

    my $res = $ua->get($query);

    if($res->is_success)
    {
        my $json = $res->decoded_content;
        my $decoded_json = decode_json($json);
        push (@$list, @{$decoded_json->{'result'} });
    }
    else
    {
        die $res->status_line;
    }
}

my %list;

log_list('value', \%list);

print %list;
[download]

When I run this as a separate script from the command line I get the correct result. But when I put it in a Perl module and call it from HTML page in RT I get following error in logs:

DEBUG: .../IO/Socket/SSL.pm:862: ssl handshake done DEBUG: .../IO/Socket/SSL.pm:1106: SSL read error DEBUG: .../IO/Socket/SSL.pm:1106: local error: SSL read error error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure

And this is in response (looks like it was created on local machine):

Status read failed: at /usr/local/share/perl/5.24.1/Net/HTTP/Methods.pm line 282.

It fails when reading from the socket. I tried this with another SSL Socket implementation - Net::SSL It works for a few hours but then errors start appearing with increasing frequency until it does not work at all. I get the same error in response. It starts to work again when I restart the apache service. Therefore I think there might be some race condition when reading from the socket and it has little to do with the handshake (from the script the handshake works all the time). I am stuck here. What can cause this and how can I get more information about this problem?

Comment on Apache - read from socket problem Download Code

Replies are listed 'Best First'.
Re: Apache - read from socket problem by hippo (Archbishop) on Sep 20, 2018 at 13:25 UTC
It works for a few hours but then errors start appearing with increasing frequency until it does not work at all. That sounds a bit like a memory leak. Do you ever trim `%list` or does it just grow without limit?	[reply] [d/l]
Re^2: Apache - read from socket problem by Stetec (Novice) on Sep 20, 2018 at 14:12 UTC
I create a new list with each request. But I never thought about memory leak and it could be something like that. Do you have any tip how can I find memory leaks in mason script? (in RT the function call is in mason script)	[reply]
Re^3: Apache - read from socket problem by hippo (Archbishop) on Sep 20, 2018 at 14:34 UTC
Not really as I've never used Mason in production. But more generally there is lots of good stuff in the mod_perl coding guide. A crude yet simple way to spot if you have a memory leak is to just keep an eye on the RSS of the apache processes over time. If they keep going up you know you have a problem. Good luck.	[reply]