Month: November 2011

IT

HylaFax needs fonts

Trying to use HylaFax on CentOS 6, I got the following message:

/usr/sbin/textfmt: No font metric information found for "Courier-Bold".
Usage: /usr/sbin/textfmt [-1] [-2] [-B] [-c] [-D] [-f fontname] [-F fontdir(s)] [-m N] [-o #] [-p #] [-r] [-U] [-Ml=#,r=#,t=#,b=#] [-V #] files... >out.ps
Default options: -f Courier -1 -p 11bp -o 0
Error converting data; command was "/usr/sbin/textfmt -B -f Courier-Bold        -Ml=0.4in -p 11 -s default

This means that the font Courier-Bold is not installed on the system. On my CentOS 6 installation, I got it working by performing the following actions:

  • adding /usr/share/enscript/afm to both FontMap: and FontPath: in /etc/hylafax/hyla.conf
  • run sed -i "s/Courier-Bold/cob/g" /etc/hylafax/typerules
  • also, you need to install the package enscript: yum -y install enscript
© GeekLabInfo HylaFax needs fonts is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to https://www.geeklab.info

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IT

Un-hide the “http://” in Firefox 7

Firefox 7 has this annoying feature to hide the http:// in front of an address and to hide a single trailing forward slash. What's most annoying, is that when copying the url to a clipboard, it prepends the http:// again. So when I enter a website, then copy the domainname to a console in order to ping/trace/whois it, I have to remove the http:// manually.

To restore the prefix, enter the url about:config. Search for browser.urlbar.trimURLs and toggle it to false. That's all folks.

© GeekLabInfo Un-hide the "http://" in Firefox 7 is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to https://www.geeklab.info

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IT

Reconfigure nspluginwrapper

Yay, I just upgraded my nspluginwrapper and everything broke. Again. Couldn't use youtube or any of my other favorite sites anymore.

Running firefox from the console gave me some feedback:

*** NSPlugin Viewer  *** ERROR: NP_Initialize() get args: Message argument mismatch
*** NSPlugin Viewer  *** ERROR: rpc_end_sync called when not in sync!
*** NSPlugin Wrapper *** ERROR: NP_Initialize() wait for reply: Connection closed
NOTE: child process received `Goodbye', closing down

When I google'd around a bit, I found some commands for older/different versions of nspluginwrapper. Finally, I tried the parameters of the old binary on the new binary:
/usr/lib64/nspluginwrapper/npconfig -a -v -i
and got the output:

Auto-install plugins from /usr/lib/mozilla/plugins
Looking for plugins in /usr/lib/mozilla/plugins
Install plugin /usr/lib/mozilla/plugins/libflashplayer.so
  into /home/username/.mozilla/plugins/npwrapper.libflashplayer.so
Auto-install plugins from /usr/lib64/mozilla/plugins
Looking for plugins in /usr/lib64/mozilla/plugins
*** NSPlugin Viewer  *** ERROR: /usr/lib64/mozilla/plugins/libtotem-gmp-plugin.so: wrong ELF class: ELFCLASS64
Install plugin /usr/lib64/mozilla/plugins/libtotem-gmp-plugin.so
  into /home/username/.mozilla/plugins/npwrapper.libtotem-gmp-plugin.so
*** NSPlugin Viewer  *** ERROR: /usr/lib64/mozilla/plugins/skypebuttons.so: wrong ELF class: ELFCLASS64
Install plugin /usr/lib64/mozilla/plugins/skypebuttons.so
  into /home/username/.mozilla/plugins/npwrapper.skypebuttons.so
*** NSPlugin Viewer  *** ERROR: /usr/lib64/mozilla/plugins/libtotem-cone-plugin.so: wrong ELF class: ELFCLASS64
Install plugin /usr/lib64/mozilla/plugins/libtotem-cone-plugin.so
  into /home/username/.mozilla/plugins/npwrapper.libtotem-cone-plugin.so
*** NSPlugin Viewer  *** ERROR: /usr/lib64/mozilla/plugins/librhythmbox-itms-detection-plugin.so: wrong ELF class: ELFCLASS64
Install plugin /usr/lib64/mozilla/plugins/librhythmbox-itms-detection-plugin.so
  into /home/username/.mozilla/plugins/npwrapper.librhythmbox-itms-detection-plugin.so
*** NSPlugin Viewer  *** ERROR: /usr/lib64/mozilla/plugins/libtotem-narrowspace-plugin.so: wrong ELF class: ELFCLASS64
Install plugin /usr/lib64/mozilla/plugins/libtotem-narrowspace-plugin.so
  into /home/username/.mozilla/plugins/npwrapper.libtotem-narrowspace-plugin.so
*** NSPlugin Viewer  *** ERROR: /usr/lib64/mozilla/plugins/libtotem-mully-plugin.so: wrong ELF class: ELFCLASS64
Install plugin /usr/lib64/mozilla/plugins/libtotem-mully-plugin.so
  into /home/username/.mozilla/plugins/npwrapper.libtotem-mully-plugin.so
*** NSPlugin Viewer  *** ERROR: /usr/lib64/mozilla/plugins/libjavaplugin.so: wrong ELF class: ELFCLASS64
Install plugin /usr/lib64/mozilla/plugins/libjavaplugin.so
  into /home/username/.mozilla/plugins/npwrapper.libjavaplugin.so
Auto-install plugins from /home/username/.mozilla/plugins
Looking for plugins in /home/username/.mozilla/plugins
Install plugin /home/username/.mozilla/plugins/libflashplayer.so
  into /home/username/.mozilla/plugins/npwrapper.libflashplayer.so
*** NSPlugin Viewer  *** ERROR: /home/username/.mozilla/plugins/libnpgoogletalk64.so: wrong ELF class: ELFCLASS64
Install plugin /home/username/.mozilla/plugins/libnpgoogletalk64.so
  into /home/username/.mozilla/plugins/npwrapper.libnpgoogletalk64.so
*** NSPlugin Viewer  *** ERROR: /home/username/.mozilla/plugins/libnpgtpo3dautoplugin.so: wrong ELF class: ELFCLASS64
Install plugin /home/username/.mozilla/plugins/libnpgtpo3dautoplugin.so
  into /home/username/.mozilla/plugins/npwrapper.libnpgtpo3dautoplugin.so

After this, my Firefox was running as usual.

© GeekLabInfo Reconfigure nspluginwrapper is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to https://www.geeklab.info

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IT

WordPress: Posting images using XML-RPC

The following code uploads a file using xmlrpc... and without using all kinds of libs, you just need the regular php-xmlrpc module.

$rpcurl='http://www.enter-your-domain-name-he.re/xmlrpc.php';
$username='admin';
$password='your-password';
$blogid=1; //Post ID
 
$file=file_get_contents('file.jpg');
$filetype = "image/jpeg";
$filename = "remote_filename.jpg";
 
xmlrpc_set_type($file,'base64'); // <-- required!
$params = array($blogid,$username,$password,
            array('name'=>$filename,'type'=>$filetype,'bits'=>$file,'overwrite'=>false));
$request = xmlrpc_encode_request('wp.uploadFile',$params);
 
$result = go($request,$rpcurl);
print_r($result);
 
function go($request,$rpcurl){
    $ch = curl_init();
    curl_setopt($ch,CURLOPT_POST,1);
    curl_setopt($ch,CURLOPT_URL,$rpcurl);
    curl_setopt($ch,CURLOPT_POSTFIELDS,$request );
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
    $result = curl_exec($ch);
    return $result;
}
© GeekLabInfo WordPress: Posting images using XML-RPC is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to https://www.geeklab.info

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IT

Syslog kills Postfix performance

This night, some scriptkiddie decided it'd be fun to overload one of my servers by bruteforcing the FTP. The FTP server taking 90% of the CPU made the whole server slow. Especially the Postfix mailserver experienced a huge delay.

Anyway, I just firewalled out the scriptkiddie and Postfix could start processing the queue. But for some reason, it delivered no more than 5-10 mails a second. That would mean that processing the queue of 18.000 mails would take 30-60 minutes.

I've tried to figure out why Postfix was so slow before. Without any luck. Using the well known tuning pages didn't help me at all. Today, I opened up /usr/bin/top, to see that the system was doing a lot of I/O. I accidently found out why: I like to have syslog write *.* to /var/log/allmessages.

This simple rule caused so much extra I/O, that postfix was slowed down 90%. After disabling "allmessages" performance went up, and the queue was processed within minutes. Makes me wonder what happens if I...

  • disable logging at all, which is a bad idea as you can no longer spot abuse
  • find a way to enable write-cache - the default syslog of CentOS 5 does not support this AFAIK
  • write logs to another device

Interesting...

© GeekLabInfo Syslog kills Postfix performance is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to https://www.geeklab.info

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