On 19 Apr 2023, at 19:08, Yann Ylavic <[email protected]> wrote:
> Currently all the tests (framework) are broken due to cmd->regex not
> being properly stacked/scoped.
> If cmd->regex is to be used to store the enclosing section's regex, it
> should be saved and restored by *all* the the sections (much like
> cmd->override is saved/restored using the old_overrides stack variable
> in most sections). It should also be set to NULL when parsing
> (sub-)sections with no possible regex, unless we want to inherit
> cmd->regex there.
This is done in r1909356.
>
> But for instance some like:
> <Location ...>
> <If ...>
> # use /fake from <Location>
> Alias /real
> </If>
> </Location>
> won't work for Alias because <If> overwrites cmd->path with "*If".
I just found that - that’s definitely broken, it means you can’t do this:
<Location /svn/extra>
<If [something]>
DAV svn
SVNPath /home/trac/svn/extra
</If>
</Location>
Looks like the same effect as the Alias bug, where every url is mapped to “*If”.
> Also, what about:
> <DirectoryMatch ...>
> <FilesMatch ...>
> # which regex here?
> </FilesMatch>
> </DirectoryMatch>
In the above “which regex here” would be FilesMatch, which wouldn’t change.
> Or:
> <DirectoryMatch ...>
> <Files ...>
> # <DirectoryMatch>'s regex usable here?
> </Files>
> </DirectoryMatch>
> ?
Combining regexes is probably a step too far. Right now DirectoryMatch’s regex
isn’t usable at the point as the DirectoryMatch regex is not passed across
Files. This behaviour doesn't change.
> Or third-party sections (unaware of cmd->regex) which contain
> directives that depend on cmd->regex?
Again there would be no change to behaviour that I can see, the regex was
hidden before and the raw path (containing the regex) would be used, now
cmd->regex would be set to NULL and the raw path (containing the regex) would
be used.
> I'm not saying it's a bad idea but it needs more changes than this
> commit, changes that spread all over the code base it seems (modules
> can have their sections too), something like:
> $ grep -r 'AP_INIT\w\+("<' server/ modules/ 2>/dev/null
> server/core.c:AP_INIT_RAW_ARGS("<Directory", dirsection, NULL, RSRC_CONF,
> server/core.c:AP_INIT_RAW_ARGS("<Location", urlsection, NULL, RSRC_CONF,
> server/core.c:AP_INIT_RAW_ARGS("<VirtualHost", virtualhost_section,
> NULL, RSRC_CONF,
[snip]
cmd->regex is a function of cmd->path, so only places that touch cmd->path need
touch cmd->regex, and this seems to be directory, location and file.
<If> seems broken right now, need to fix that separately.
> Maybe we only want to check that the parent directive is a <Location>
> with Alias for now?
Right now it’s limited to not-in-directory:
https://github.com/apache/httpd/blob/trunk/modules/mappers/mod_alias.c#L146
If this is too difficult to backport it isn't the end of the world, the main
thing is that it's fixed for the future.
Regards,
Graham
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