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Transparent Proxy with URL Rewriting

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Old 03-05-2012
Transparent Proxy with URL Rewriting
All traffic on the LAN is routed through a single machine and filtered using iptables. I'd like to redirect this traffic to a transparent proxy running on the same machine that will rewrite the URL if it matches a specified regex, in which case the user will be redirected to a local server. In other words, all HTTP requests should flow through as usual unless the user attempts to navigate to, say, "xyz.com," in which case the proxy will send the user to Apache running locally with a page displaying something like "Sorry, you can't go here." I have already investigated Squid and its URL rewriting component, but it seems terribly complicated to configure and a bit overkill since I won't be using 98% of its other features. Is there a free program other than Squid I could use, or perhaps someone could provide me with some resources for writing a program myself if it isn't too complicated?
Last edited by crottyan; 03-05-2012 at 05:46 PM..
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LEARN ABOUT POSIX

iptables-save

IPTABLES-SAVE(8)						  iptables 1.6.1						  IPTABLES-SAVE(8)

NAME

       iptables-save -- dump iptables rules to stdout

       ip6tables-save -- dump iptables rules to stdout

SYNOPSIS

       iptables-save [-M modprobe] [-c] [-t table]

       ip6tables-save [-M modprobe] [-c] [-t table]

DESCRIPTION

       iptables-save  and ip6tables-save are used to dump the contents of IP or IPv6 Table in easily parseable format to STDOUT. Use I/O-redirect-
       ion provided by your shell to write to a file.

       -M, --modprobe modprobe_program
	      Specify the path to the modprobe program. By default, iptables-save will inspect /proc/sys/kernel/modprobe  to  determine  the  exe-
	      cutable's path.

       -c, --counters
	      include the current values of all packet and byte counters in the output

       -t, --table tablename
	      restrict output to only one table. If not specified, output includes all available tables.

BUGS

       None known as of iptables-1.2.1 release

AUTHORS

       Harald Welte <laforge@gnumonks.org>
       Rusty Russell <rusty@rustcorp.com.au>
       Andras Kis-Szabo <kisza@sch.bme.hu> contributed ip6tables-save.

SEE ALSO

       iptables-apply(8),iptables-restore(8), iptables(8)

       The  iptables-HOWTO, which details more iptables usage, the NAT-HOWTO, which details NAT, and the netfilter-hacking-HOWTO which details the
       internals.

iptables 1.6.1															  IPTABLES-SAVE(8)