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I just installed php-suhosin 0.9.29 from EPEL on a CentOS 5.6 box. I’m running a whole bunch of name-based vhosts in Apache, and have a bunch of web apps, so I opted to run suhosin in simulation mode (don’t actually block anything, but log errors) and have it log via syslog to a single file. Unfortunately, when I configured this, the syslog messages started showing up in the wrong place, apparently with the wrong facility and priority. After some roundabout debugging (at first assuming syslogd to be the problem), I determined that, for whatever really strange reason (perhaps an incorrect syslog.h on the EPEL box that built the suhosin package?) the LOG_* constants were incorrect. I looked up the correct integer values in /usr/include/sys/syslog.h and the following configuration directives accomplished the task correctly:

suhosin.log.syslog.facility = 128
; 128 = LOG_LOCAL0

suhosin.log.syslog.priority = 5
; 5 = LOG_NOTICE

This one line puts suhosin into simulation mode, where it only logs errors instead of enforcing on them:

suhosin.simulation = On

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