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add an <IfFile> config section like <IfDefine>

It allows a non httpd config file to be used as a marker directly in
httpd.conf without hiding logic in a script in front of apachectl
to do test -f and pass extra -D's.

This is something we've had in IBM's httpd distro for a little bit and
hadn't remembered to share. I've seen some questions/config files come
up in a few places lately that would benefit from this as an option.

Remove duplicate implementations of conditional section function.  No
functional change.

* server/core.c (start_cond_section): Factor out from start_if*.
  Adjust to use apr_strmemdup.
  (test_ifmod_section, test_iffile_section, test_ifdefine_section):
  Move container-specific tests into callbacks from start_if*.
  (core_cmds): Adjust <IfFile, <IfDefine, <IfModule to use
  start_cond_section with callbacks.

Add <IfDirective> and <IfSection>:

* server/core.c
  (test_ifdirective_section, test_ifsection_section): New callbacks.
  (core_cmds): Define new directives.

* include/http_config.h, server/config.c (ap_exists_directive):
  New function.

* include/ap_mmn.h: Bump MMN minor for above.

* docs/manual/mod/core.xml: Add docs.

* server/core.c (start_cond_section): Comment & variable name fixes,
  no functional change.

Submitted by: covener, jorton
Reviewed by: jorton, ylavic, covener


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mod_proxy_balancer: Add hot spare member type and corresponding flag (R). Hot spare members are
used as drop-in replacements for unusable workers in the same load balancer set. This differs
from hot standbys which are only used when all workers in a set are unusable. PR 61140.


mod_proxy_balancer: follow up to r1828890: indentation and 80 col.


Submitted by: jhriggs, ylavic
Reviewed by: jhriggs, jim, ylavic


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Merge r1490294, r1734635, r1749403, r1813116, r1816179, r1817598, r1832198, r1832200, r1832277, r1832317 from trunk:

Note that the function will be available in APR.


Silent a smatch warning:
mod_auth_form.c:626 get_form_auth() warn: variable dereferenced before check 'sent_user' (see line 616)

Use 'memcpy' instead of 'strcpy' when the size of the string has already been computed.

Fix compilation failure :

unixd.c: In function ‘ap_unixd_mpm_set_signals’:
unixd.c:579:5: error: implicit declaration of function ‘apr_signal’; did you mean ‘strsignal’? [-Werror=implicit-function-declaration]
     apr_signal(SIGPIPE, SIG_IGN);
     ^~~~~~~~~~
     strsignal

Not sure where it comes from, maybe related to r1812301.

mod_substitute: add runtime traces. PR 61132.



In verify_ocsp_status in ssl_engine_ocsp.c, the log message, "OCSP response not successful: %d" should print the value of r instead of rc.
The value of rc will always be 0.

PR 61876 [sam <sam.eastman.4114 gmail.com>]

Success of 'SHGet...

fix my confusion, move vote


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On the trunk:

mod_http2: restoring the v1.10.16 keepalive timeout behavioud of mod_http2 (to be verified).

ALSO: mod_http2: adding regular memory cleanup when transferring large response bodies. This
      reduces memory footprint and avoids memory exhaustion when transferring large files
      on 32-bit architectures. Fixes PR 62325.

Submitted by: icing
Reviewed by: icing, ylavic, jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1832566 13f79535-47bb-0310-9956-ffa450edef68

suexec: Add support for logging to syslog as an alternative to a
logfile.

* support/suexec.c (err_output) [AP_LOG_SYSLOG]: Log to syslog.
  (main): Close syslog fd if open, before execv.  Add -V output
  for AP_LOG_SYSLOG.

* configure.in: Add --with-suexec-syslog argument; allow
  --without-suexec-logfile to omit definition of AP_LOG_EXEC.


suexec: Support use of setgid/setuid capability bits on Linux, a
weaker set of privileges than the full setuid/setgid root binary.

* configure.in: Add --enable-suexec-capabilites flag.

* Makefile.in: If configured, use setcap instead of chmod 7555 on
  installed suexec binary.

* modules/arch/unix/mod_unixd.c (unixd_pre_config): Drop test for
  setuid bit if capability bits are used.

* docs/manual/: Add docs.


* docs/manual/suexec.html.en: Update for syslog logging.


* configure.in: Correct handling of --with-suexec-logfile in r1341905,
  thanks to rpluem.


* support/suexec.c: Define AP_LOG_FACILITY.
  (err_output): Use AP_LOG_FACILITY for syslog facility.

Suggested by: kbrand


* configure.in: Fix help text for --with-suexec-syslog.

Submitted by: jorton
Reviewed by: jorton, ylavic, jim


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* modules/ssl/ssl_engine_init.c (ssl_init_Module): Don't enable SSL
  for a vhost if SSLEnable is not used and no certs are configured,
  even if the Listen protocol is "https".  Restores behaviour to that
  prior to r1809303 for configs which would now otherwise fail at
  startup.

Submitted by: jorton
Reviewed by: jorton, jim, ylavic


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if the ErrorLog directive is configured with the 'syslog' prefix. PR 62102

trunk patch: none, as far as I can see the code in trunk diverged too much
          due to the code in STALLED for ap_errorlog_provider.
 
Submitted by: elukey, jhriggs, jailletc36
Reviewed by: elukey, jhriggs, ylavic


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core: Avoid a compiler warning when NO_LINGCLOSE is used (-Wunreachable-code).
Also, check c->aborted before apr_socket_shutdown() because it is set earlier,
and there is no point in calling shutdown() before close().


mod_ldap: fix format warnings.


Submitted by: ylavic
Reviewed by: jailletc36, jim, ylavic


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Instrument 'bbout'


mod_http2: use proper ARP defined for formatting apr_off_t


On the trunk:

mod_http2: on level trace2, log any unsuccessful HTTP/2 direct connection upgrade
     with base64 encoding to unify its appearance in possible bug reports.


On the trunk:

* mod_http2: calculate unencrypted connection sniffing base64 only when log level is at required height. [Ruediger Pluem]


On the trunk:

mod_http2: accurate reporting of h2 data input/output per request via mod_logio. Fixes
     an issue where output sizes where counted n-times on reused slave connections. See
     gituhub issue: https://github.com/icing/mod_h2/issues/158


Submitted by: jailletc36, icing, icing, icing, icing
Reviewed by: icing, jim, ylavic


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On the trunk:

mod_http2: always wake up any conditional waits when streams are aborted. Fixes race conditions where timeouts would trigger instead.

Submitted by: icing
Reviewed by: icing, jim, ylavic


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* When mod_http2 is loaded more then ThreadsPerChild backend connections can
  be useful as mod_http2 has an additional thread pool on top of
  ThreadsPerChild.
  But leave the default with ThreadsPerChild.


* Add some some comment why we do not limit hmax any longer


mod_proxy: follow up to r1822849.

Get the help(er) of mod_http2 to determine how much connections should
be handled in the reslist by default (i.e. max_threads).


mod_proxy: follow up to r1822849 and r1822878.

Does r1822878's "static" APR_RETRIEVE_OPTIONAL_FN work if, say, mod_proxy is
builtin but mod_http2 isn't?

Not worth taking the risk here since it's not a fast path...

Note: if this is an issue, I'm afraid it applies elsewhere too.


mod_proxy: follow up to r1822849 and r1822879.

Fix my maths, thanks Stefan and Rüdiger!


needs mod_http2.h


* Add missing CHANGES entry for revisions 1822849,1822858,1822878,1822879,1822883,1828485


Submitted by: rpluem, ylavic, ylavic, ylavic, gsmith, rpluem
Reviewed by: rpluem, jim, ylavic


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