[syslog-ng] Bug in 2.0.7's use_dns(persist_only) and large host files

[Steve Bernacki]

Environment:  CentOS 5 and Syslog-ng 2.0.7 (current snapshot)
Relevant syslog-ng.conf snippet:
===
options {
         use_dns(persist_only);
         dns_cache_hosts("/etc/hosts");
};
===

If you point syslog-ng to an /etc/hosts file that has more than 1007 
entries, upon receiving its first message, syslog-ng will throw the 
following assertion:

# ./syslog-ng -Fed
syslog-ng starting up; version='2.0.7'
Incoming log entry; line='<38>well hello'
file dnscache.c: line 99 (dns_cache_key_hash): should not be reached
Aborted

Workaround:   In syslog-ng.conf, set dns_cache_size() to a value greater 
than the number of entries in your /etc/hosts file.

Fix:  See the attached patch; it should apply cleanly to any version of 
2.0.7, and perhaps older versions as well.

Steve
-- 
Steve Bernacki, Jr
To date, the Pan-Massachusetts Challenge has raised 204 million
dollars for cancer research.  Get involved!  http://www.pmc.org/

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