https://issues.apache.org/bugzilla/show_bug.cgi?id=52532
Bug #: 52532
Summary: VirtualHost added TWICE to name-virtual-host list when
multiple names resolve to same IP address.
Product: Apache httpd-2
Version: 2.2.21
Platform: All
OS/Version: All
Status: NEW
Severity: trivial
Priority: P4
Component: Core
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Example:
<VirtualHost www.example.com:80 www.example.org:80>
ServerName www.example.com
ServerAlias www.example.org
...
These two hostnames share an IP address.
When more than one hostname resolves to a given address, the virtual host
section is added to that address' name-virtual-host chain more than once.
Result:
192.0.2.1:80 is a NameVirtualHost
default server ...
port 80 namevhost www.example.com (.../httpd.conf:line-X)
port 80 namevhost www.example.com (.../httpd.conf:line-X)
This problem does not affect the end-result operation of named virtual host
resolution. However, having the same entry appear more than once in a given
NVH chain does cause unnecessary and duplicate comparisons (when the NVH isn't
matched via its ServerName, ServerAlias, or ServerPath values).
Solution: One should check the existing NVH chain to see if the entry being
added is already on that list before adding it. I have not even looked at the
code so I leave that for someone else more familiar with apache to deal with.
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