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Fix a segmentation fault if AuthzDBDQuery is not set.

PR: 61546
Submitted by: Lubos Uhliarik <luhliari redhat.com>
Reviewed by: jailletc36, ylavic, elukey


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*) mod_rewrite: Add support for starting External Rewriting Programs
   as non-root user on UNIX systems by specifying username and group name
   as third argument of RewriteMap directive.

Submitted by: jkaluza
Reviewed by: jorton, wrowe, ylavic


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* server/protocol.c (ap_content_length_filter): Rewrite the content
  length filter to avoid arbitrary memory consumption for streaming
  responses (e.g. large CGI script output).  Ensures C-L is still
  generated in common cases (static content, small CGI script output),
  but this DOES change behaviour and some responses will end up
  chunked rather than C-L computed.

PR: 61222
Submitted by: jorton, rpluem
Reviewed by: jorton, wrowe, ylavic


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mod_ssl: return non ambiguous value in ssl_callback_SessionTicket() for
encryption mode (we used to return 0, OpenSSL documents returning 1 instead).

Practically this does not change anything since OpenSSL will only check for
>= 0 return value (non error) for encryption mode (the other possible return
values are only relevant for decryption mode).

However the OpenSSL documentation for SSL_CTX_set_tlsext_ticket_key_cb()
states:
"
The return value of the cb function is used by OpenSSL to determine what
further processing will occur. The following return values have meaning:

2
    This indicates that the ctx and hctx have been set and the session can
    continue on those parameters. Additionally it indicates that the session
    ticket is in a renewal period and should be replaced. The OpenSSL library
    will call cb again with an enc argument of 1 to set the new ticket (see
    RFC5077 3.3 paragraph 2).

1
    This indicates that the ctx and hctx have been set and the session can
    continue on those parameters.

0
    This indicates that it was not possible to set/retrieve a session ticket
    and the SSL/TLS session will continue by by negotiating a set of
    cryptographic parameters or using the alternate SSL/TLS resumption
    mechanism, session ids.
    If called with enc equal to 0 the library will call the cb again to get a
    new set of parameters.

less than 0
    This indicates an error.
"

So 0 is not appropriate in our code, 1 is what we really want (and it won't
break if OpenSSL later changes its checks on the callback return value).

Reported/Proposed by: oknet on github, pull request #18.
Reviewed by: jorton, ylavic, wrowe
[Closes #18]


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Quiet spurious gcc warning in ap_parse_form_data ("'escaped_char[0]' may be
used uninitialized in this function").

Submitted by: ylavic
Reviewed by: jailletc36, ylavic, jorton


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* Make it compatible with Python 3
Submitted by: rpluem


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* The calculation of the sizes was flawed:
  The index tells us the size of the node in 4096 byte pages minus 1.
  Hence we need to multiply back with 4096 aka << 12 (plus adding the
  missing page).

Submitted by: rpluem


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* It needs to be the dereferenced node

* Convert to int before using
Submitted by: rpluem


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  The index tells us the size of the node in 4096 byte pages minus 1.
  Hence we need to multiply back with 4096 aka << 12 (plus adding the
  missing page).

Reverted in r1811568


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wrowe's +1 for C-L filter rewrite per msgid <CACsi252gUT1n_mzgwUVathOwYbidDzET7bTXR_KycobyLBWKAQ@mail.gmail.com>


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* Add dump_all_pools and dump_pool_and_childs.

  - dump_all_pools: Dump the whole pool hierarchy starting from apr_global_pool.
                    Requires an arbitrary pool as starting parameter.
  - dump_pool_and_childs: Dump the whole pool hierarchy starting from
                          the given pool.

  dump_pool_and_childs is written in Python using the GDB Python API
  as doing recursive stuff in standard GDB macros is very difficult.


* Take the pointer from Yann: s/childs/children/

Submitted by: rpluem


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* Correctly dump pools that have no tag
Submitted by: rpluem


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.gdbinit: Add dump_skiplist.
Submitted by: ylavic


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