Shell script problem

Ashkan_s · 07-27-2008, 05:42 AM

Hi
I have a shell script code and I can't find the meaning of the $MPB that used there

.

here is part of the code:

Code:

fprintf (script, "#-----------( Firestarter " VERSION ", Netfilter kernel subsystem in use )----------#\n");
	fprintf (script, "#                                                                             #\n");
	fprintf (script, "# This firewall was generated by Firestarter on %s              #\n", timestamp);
	fprintf (script, "# http://www.fs-security.com                                                  #\n");
	fprintf (script, "#                                                                             #\n");
	fprintf (script, "#-----------------------------------------------------------------------------#\n\n");
  			
	/* Autoloading of netfilter modules must be done before chains are flushed.*/
    fprintf (script, "\n# --------( Initial Setup - Firewall Modules Autoloader )--------\n\n");

	fprintf (script, "# Remove ipchains module if found\n");
	fprintf (script, "$LSM | grep ipchains -q -s && $RMM ipchains\n\n");

	fprintf (script, "# Try to load every module we need\n");
	fprintf (script, "$MPB ip_tables 2> /dev/null\n");
	fprintf (script, "$MPB iptable_filter 2> /dev/null\n");
	fprintf (script, "$MPB ipt_state 2> /dev/null\n");		
	fprintf (script, "$MPB ip_conntrack 2> /dev/null\n");
	fprintf (script, "$MPB ip_conntrack_ftp 2> /dev/null\n");
	fprintf (script, "$MPB ip_conntrack_irc 2> /dev/null\n");
	fprintf (script, "$MPB ipt_REJECT 2> /dev/null\n");
	/* fprintf (script, "$MPB ipt_REDIRECT 2> /dev/null\n"); */
	fprintf (script, "$MPB ipt_TOS 2> /dev/null\n");
	fprintf (script, "$MPB ipt_MASQUERADE 2> /dev/null\n");
	fprintf (script, "$MPB ipt_LOG 2> /dev/null\n");
	fprintf (script, "$MPB iptable_mangle 2> /dev/null\n");
	fprintf (script, "$MPB ipt_ipv4optsstrip 2> /dev/null\n");
	fprintf (script, "if [ \"$NAT\" = \"on\" ]; then\n"
			 "	$MPB iptable_nat 2> /dev/null\n"
			 "	$MPB ip_nat_ftp 2> /dev/null\n"
			 "	$MPB ip_nat_irc 2> /dev/null\n"
			 "fi\n");

	fprintf (script, "if [ \"EXT_PPP\" = \"on\" ]; then\n"
			 "	$MPB bsd_comp 2> /dev/null\n"
			 "	$MPB ppp_deflate 2> /dev/null\n"
			 "fi\n\n");

homey · 07-27-2008, 06:12 AM

It would be more useful if you posted the whole script but, googling around, I find samples where it's just a variable pointing to modprobe.

Code:

# executable file paths
IPT=/sbin/iptables
IFC=/sbin/ifconfig
MPB=/sbin/modprobe
LSM=/sbin/lsmod
RMM=/sbin/rmmod
SYSCTL=/sbin/sysctl


$MPB iptable_filter 2>/dev/null

pixellany · 07-27-2008, 06:51 AM

More generally....... "$MPB" says "get the value of the variable named MPB". Somewhere, this has to get created. We would have to know the context of what you have showed us so far.

Ashkan_s · 07-27-2008, 07:37 AM

Thanks

I find definition of the variable in the other file:
IPT=`which iptables`
IFC=/sbin/ifconfig
MPB=/sbin/modprobe
LSM=`which lsmod`
RMM=/sbin/rmmod