2007 May 09 - Wed
Various Perl Based Proxy Tools
In perusing Debian's Package List,
I came across a number of Perl based Proxy tools.
The first one, an item that sounds interesting, but havn't thought of a way to put it into
action yet, is an HTTP Recorder. HTTP::Recorder
is a browser-independent recorder that
records interactions with web sites and produces scripts for
automated playback. Recorder produces WWW::Mechanize
scripts by default (see WWW::Mechanize
by Andy Lester),
The next item is an HTTP Tunnel. httptunnel creates a bidirectional virtual data connection
tunnelled in HTTP requests. The HTTP requests can be sent via an HTTP proxy if so desired.
This can be useful for users behind restrictive firewalls. If WWW access is allowed through a
HTTP proxy, it's possible to use httptunnel and, say, telnet or PPP to connect to a computer
outside the firewall.
The third item is HTTP::Proxy. It is a Perl based HTTP Proxy. It sounds like it can do some
SSL type interception as well. It has an ability for add-on modules allowing various parts
of a page to be re-processed prior to delivery back to a user.
[/OpenSource/Debian]
permanent link
Redirecting a Web Page
I've encountered a number of ways to redirect a web page. If all you have access to is a web page, then
a meta tag is the way to go:
<html>
<head>
<meta http-equiv="refresh" content="3;url=/liveprobe/index.html">
</head>
<body>
You will be redirected to <a href=/liveprobe/index.html>/liveprobe/index.html</a> in 3 seconds.
</body>
</html>
More meta-tags can be found at http://vancouver-webpages.com/META/.
If pages are being dynamically created, then executing the following code before anything else on the page is generated should do the trick (I haven't
tried it out myself yet):
print "Status: 302 Moved Temporarily\r\n",
"Location: $url\r\n",
"Content-Type: text/html\r\n\r\n",
"$url\r\n";
[/Personal/SoftwareDevelopment/HTML]
permanent link
Upgrading Nfsen and Nfdump
As an update to my two articles for installing nfdump and installing nfsen, here are a few corrections and a process for upgrading.
As of this writing, the latest snapshots are for March 12. Here is the upgrade process:
cd /usr/src
wget http://superb-east.dl.sourceforge.net/sourceforge/nfsen/nfsen-snapshot-20070312.tar.gz
wget http://superb-west.dl.sourceforge.net/sourceforge/nfdump/nfdump-snapshot-20070312.tar.gz
/usr/local/nfsen/bin/nfsen.rc stop
tar -zxvf nfdump-snapshot-20070312.tar.gz
tar -zxvf nfsen-snapshot-20070312.tar.gz
cd nfdump-snapshot-20070312
./configure
make
make install
cd ../nfsen-snapshot-20070312
./install.pl /etc/nfsen/nfsen.conf
/usr/local/nfsen/bin/nfsen.rc start
The 'start' command could be placed in /etc/rc.local so it starts upon boot. The start command
also starts the flow collectors (nfdump), so there is no need to start them; the nfsen.rc command takes care
of everything.
[/OpenSource/Debian/Monitoring]
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