01-15-2015
Wrapper functions like SuSEFirewall2
Hey everyone, I have a question. I'm administering a linux machine that runs openSuSE. A few of the functions that I'd normally do manually, have programs that take over the task. For example, I wanted to add a few rules to my iptables. I then found out that there is an openSuse tool (SuSEfirewall2). Another exists for DNS configuration. Is using these tools mandatory?
I tried making the iptables changes the normal way by editing the file, but it didn't seem to work. Once I did the same changes with SuSEFirewall2, it seemed to work. I'm not sure if me using the suse firewall is what helped though.
So my question is, in linux in general, when there is a 'wrapper' tool like these, that edit the files for us, are we obligated to use them or can we by pass the function and do it manually?
Did the act of me using the openSusefirewall2 tool cause it to add something that I couldn't have by manually editing the iptables file?
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LEARN ABOUT DEBIAN
mail::milter::wrapper::decodesrs
Mail::Milter::Wrapper::DecodeSRS(3pm) User Contributed Perl Documentation Mail::Milter::Wrapper::DecodeSRS(3pm)
NAME
Mail::Milter::Wrapper::DecodeSRS - milter wrapper to decode SRS-encoded return path
SYNOPSIS
use Mail::Milter::Wrapper::DecodeSRS;
my $milter = ...;
my $wrapper = new Mail::Milter::Wrapper::DecodeSRS($milter);
my $wrapper2 = &DecodeSRS($milter); # convenience
DESCRIPTION
Mail::Milter::Wrapper::DecodeSRS is a convenience milter wrapper which decodes MAIL FROM: return paths which have been encoded by the
Sender Rewrite Scheme, SRS. (More information: http://www.libsrs2.org/) This wrapper internally understands both the SRS0 and SRS1 encod-
ing schemes documented by the Mail::SRS author.
The decoded address is made available to the contained milter via the "envfrom" callback, in the same way that a raw address would.
NOTE: If the address is not SRS encoded, the contained milter is NOT called for the duration of the message; instead, SMFIS_ACCEPT is
returned. This is because the milter writer is expected to use this wrapper in a chain that also includes the contained milter without
wrapping, in order to prevent a malicious sender from using SRS to bypass access checks.
For instance, the following is a proper usage of this wrapper in a chain:
my $envfrommilter = ...;
my $combinedmilter = new Mail::Milter::Chain(
new Mail::Milter::Wrapper::UnwrapSRS($envfrommilter),
$envfrommilter
);
This behavior can also be used if, e.g., the MTA already does one form of MAIL FROM: check, and the contained milter repeats that same
database check against SRS rewritten addresses. (A good example would be a milter emulating Sendmail's access_db map.)
AUTHOR
Todd Vierling, <tv@duh.org> <tv@pobox.com>
SEE ALSO
Mail::Milter::Wrapper
perl v5.8.8 2004-02-26 Mail::Milter::Wrapper::DecodeSRS(3pm)