Postfix, Omar Kilani’s Memcache Patch Try-Out

I was rewrote Omar Kilani’s memcache patch couple of weeks ago. But that was not tested due to lack of time and unavailability of servers that can be used.

Now, i got chance to implement simple test. This is my configuration:
main.cf

smtpd_recipient_restrictions =
   ...
   ...
   check_recipient_access memcache:/etc/postfix/memcache.cf,
   ...
   ...

memcache.cf

servers = localhost:11211
key_format = %s

Entry on memcache

spam@example.com	REJECT	not allowed

Query using postmap

$ postmap -q "spam@example.com" memcache:/etc/postfix/memcache.cf
postmap: dict_memcache_lookup: using key_format '%s'
postmap: plmemcache_get: fetching key spam@example.com from memcache
postmap: plmemcache_get: key spam@example.com =>; REJECT not allowed
postmap: dict_memcache_lookup: spam@example.com returned REJECT not allowed
REJECT not allowed

A little bit too verbose i guess, but it can be adjusted by modifying source code.

Here’s non-verbose version postfix-memcache patch [download#42]
Test it on the fly:

220 mx.example.com ESMTP Postfix (2.9-20110706)
ehlo othermx.example.com
250-mx.example.com
250-PIPELINING
250-SIZE 52428800
250-ETRN
250-STARTTLS
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
mail from:<foo@example.com>;
250 2.1.0 Ok
rcpt to:<spam@example.com>;
554 5.7.1 <spam@example.com>;: Recipient address rejected: not allowed
quit
221 2.0.0 Bye
Connection closed by foreign host.

Logs:

Aug  9 09:49:59 fire postfix/smtpd[7860]: connect from unknown[xxx.xxx.xx.xxx]
Aug  9 09:50:34 fire postfix/smtpd[7860]: dict_memcache_lookup: using key_format '%s'
Aug  9 09:50:34 fire postfix/smtpd[7860]: plmemcache_get: fetching key spam@example.com from memcache
Aug  9 09:50:34 fire postfix/smtpd[7860]: plmemcache_get: key spam@example.com =>; REJECT not allowed
Aug  9 09:50:34 fire postfix/smtpd[7860]: dict_memcache_lookup: spam@example.com returned REJECT not allowed
Aug  9 09:50:34 fire postfix/smtpd[7860]: NOQUEUE: reject: RCPT from unknown[xxx.xxx.xx.xx] 554 5.7.1 <spam@example.com>;: Recipient address rejected: not allowed; from=<foo@example.com>; to=<spam@example.com>; proto=ESMTP helo=<othermx.example.com>;
Aug  9 09:50:37 fire postfix/smtpd[7860]: disconnect from unknown[xxx.xxx.xx.xx]

This is only a preliminary test, i’ve found bug that causing segmentation fault in memcache config file (need some fixes), but overall everything worked fine.