Posted inc programing

Counting Directory Size Recursively Using C

I’ve just found this great articles at Jim Plank website. I know, it was lots easier using linux du command

Without any further nonsense talk, here we go. First we need download some source code at Jim Plank website

# mkdir prsize
# cd prsize
# wget http://www.cs.utk.edu/~plank/plank/classes/cs360/360/notes/Prsize/prsize8.c
# wget http://www.cs.utk.edu/~plank/plank/classes/cs360/360/src/dllist.c
# wget http://www.cs.utk.edu/~plank/plank/classes/cs360/360/notes/Dllists/dllist.h
# wget http://www.cs.utk.edu/~plank/plank/classes/cs360/360/src/jrb.c
# wget http://www.cs.utk.edu/~plank/plank/classes/cs360/360/include/jrb.h
# wget http://www.cs.utk.edu/~plank/plank/classes/cs360/360/src/jval.c
# wget http://www.cs.utk.edu/~plank/plank/classes/cs360/360/include/jval.h

prsize8.c is the main program, while dllist.c/h jrb.c/h jval.c/h is library that prsize8 statically linked in.

Now we need to create some static library.(Original website doesn’t explain how to create the libs)

# gcc -c dllist.c -o dllist.o
# gcc -c jrb.c -o jrb.o
# gcc -c jval.c -o jval.o

# ar rcs libdllist.a dllist.o
# ar rcs libjrb.a jrb.o
# ar rcs libjval.a jval.o
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Posted inmaildrop

Maildroprc Automatically Delete quotawarn File in Maildir

This is the Ugly workaround

Postfix master.cf setting

maildrop  unix  -       n       n       -       -       pipe
  flags=ODRhu user=vmail argv=/usr/bin/maildrop -w 90 -d ${recipient} ${user} ${domain}

With this setting maildrop wil warn user if their Maildir reach 90% of quota and send warning to user

The problem is, even if user emptying their maildir, users wil always get warning because quotawarn is still in Maildir

[vchkpw] quotawarn question

#
MAILHOME="/var/data/postfix"
DOMAIN="$2"
USER="$1"

QUOTA=`echo "$MAILDIRQUOTA" | cut -f 1 -d S`
USAGE=`du -sb "$MAILHOME/$DOMAIN/$USER/" | awk '{print $1}'`
PERCENT=`echo "$QUOTA * 90/100" | bc`

if ( "$USAGE" < "$PERCENT" )
{
        `/bin/rm -f "$MAILHOME/$DOMAIN/$USER/quotawarn"`
}
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Posted inpostfix

Postfix Bind Sender Domain To Dedicated Outgoing IP Address

Recently there have been requests for sending mail with source IP addresses that depend on the envelope sender, it’s very usefull to protect IP-based domain reputations of different customers.

New Feature in postfix postfix-2.7-20091209 is sender_dependent_default_transport_maps

sender_dependent_default_transport_maps (default: empty)

    A sender-dependent override for the global default_transport parameter setting.
    The tables are searched by the envelope sender address and @domain.
    A lookup result of DUNNO terminates the search without overriding the global default_transport parameter setting.
    This information is overruled with the transport(5) table.

    Note: this overrides default_transport, not transport_maps, and therefore the expected syntax is that of default_transport.
          This feature does not support the transport_maps syntax for null transport, null nexthop, or null email addresses.

    For safety reasons, this feature does not allow $number substitutions in regular expression maps.

    This feature is available in Postfix 2.7 and later.

Create file called sdd_transport_maps.regexp:

/@customer1-dom\.tld$/		customer1:
/@customer2-dom\.tld$/		customer2:
/@customer3-dom\.tld$/		customer3:
..... next .....
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