compiling apache mod_hello
lazarus / 38-Networking and Web Programming

----------------------------------------------------------------------
mobilevil · 2017-08-06 15:21

hello

I am new to lazarus and seems I am messing with some simple setup
issue instead of a real programming issue. I am using Lazarus 1.8 RC3.

I played around with delphi apache module support many many years ago
and now I want to make something with lazarus. I have some success
with APACHE + CGI, and then I want to move to apache module.

I found the httpd24 folder in
C:\lazarus\fpc\3.0.2\source\packages\httpd24 but I don't know how to
build it
1: seems the documentation is pretty outdated. it doesn't cover apache
2.4 but I tried it out anyway,
http://wiki.lazarus.freepascal.org/FPC_and_Apache_Modules

I tried to copy the content of mod_hello.pp into a new dll project and
added the paths to "Other Unit Files". I duplicated the settings to
"Other sources" but lazarus complains about duplication and removed
it.
the build failed with APR_HOOK_MIDDLE not found.
  ap_hook_handler(@DefaultHandler, nil, nil, APR_HOOK_MIDDLE);

then I noticed that there's a make file in the folder so I tried it as
well, failed also.
I have set the environment FPCDIR and added fpc to path
C:\lazarus\fpc\3.0.2\bin\x86_64-win64;
FPCDIR=C:\lazarus\fpc\3.0.2

C:\lazarus\fpc\3.0.2\source\packages\httpd24>make
C:/lazarus/fpc/3.0.2/bin/x86_64-win64/ppcx64.exe fpmake.pp -n
Fatal: Can't find unit system used by fpmake
Fatal: Compilation aborted
make: *** [fpmake.exe] Error 1

----------------------------------------------------------------------
Leledumbo · 2017-08-06 16:24

Quote from: mobilevil on August 06, 2017, 05:21:07
pmC:\lazarus\fpc\3.0.2\source\packages\httpd24>make
C:/lazarus/fpc/3.0.2/bin/x86_64-win64/ppcx64.exe fpmake.pp -n
Fatal: Can't find unit system used by fpmake
Fatal: Compilation aborted
Build RTL first, call make in rtl folder.

Anyway, units for apache interface should've been provided precompiled
(go on check your fpc units folder). Haven't tried loading it to
apache, but the sample mod_hello (long version) compiles straight on
my fpc trunk.

----------------------------------------------------------------------
mobilevil · 2017-08-07 03:27

oh seems something was wrong in my mind. I didn't see the apache
module project type in new project dialog, and the sample source
really compiles when I paste them into a empty library project this
morning in another PC. But they still have problems.

I am using Lazarus 1.80 RC3 X64, and httpd-2.4.27-x64-vc14.zip from
http://www.apachehaus.com/downloads/httpd-2.4.27-x64-vc14.zip

for the new apache module project, I saved it and accepted the default
project name mod_apache1, and noticed some compile error.
Identifier not found "Application". I guess the Application object is
only available in EXE project? I commented them out and it compiles
fine.

begin
  {Application.Title:='mod_apache1';
  Application.ModuleName:=ModuleName;
  Application.HandlerName:=HandlerName;
  Application.SetModuleRecord(DefaultModule);
  Application.Initialize;}
end.

But apache still refuse to load the dll(renamed to .so)

httpd: Syntax error on line 191 of
C:/httpd-2.4.27-x64-vc14/Apache24/conf/httpd.
conf: Cannot load modules/mod_apache1.so into server: The specified
procedure could not be found.
I am loading it like this

LoadModule mod_apache1 modules/mod_apache1.so
<Location /mod_apache1>
    SetHandler mod_apache1
</Location>

I checked the output dll with Dll Export Viewer and see function
mod_apache1 exported at address 0x000000011005c000 ordinal 1

for the sample code in
http://wiki.lazarus.freepascal.org/FPC_and_Apache_Modules, it compiles
fine this morning with another PC, but apache still refuse to load it
with the same reason. Dll export viewer see the test_module function
is exported at 0x000000011001f000 ordinal 1
I tried to change {$define Apache2_0} to Apache2_4 but it is still the
same. I am loading it like this

LoadModule test_module modules/mod_hello.so
<Location /pmod>
    SetHandler test_module
</Location>

----------------------------------------------------------------------
mobilevil · 2017-08-07 03:42

checked with the echo example
C:\lazarus\fpc\3.0.2\source\packages\fcl-web\examples\echo too, it
doesn't compile complaining about it couldn't find the wmecho unit,
but project inspector sees the wmecho.pas correctly, so I copied the
files to another folder, removed wmecho.pas reference in the project
and add it back again. They are now sitting in the same folder.
build, and same identifier Application not found. comment out, and yes
the dll is here.
but apache still refuse to load it, same error, The specified
procedure could not be found.

i am using the config lines suggested by README of the echo project.

LoadModule mod_echo modules/echo.dll
<Location /myapache>
    SetHandler mod_echo
    Order allow,deny
    Allow from all
</Location>

----------------------------------------------------------------------
Leledumbo · 2017-08-07 04:35

Quote from: mobilevil on August 07, 2017, 05:27:22 amoh seems
something was wrong in my mind. I didn't see the apache module project
type in new project dialog
There is none.
Quote from: mobilevil on August 07, 2017, 05:27:22 am
Identifier not found "Application". I guess the Application object is
only available in EXE project? I commented them out and it compiles
fine.
It resides in custapache unit.
Quote from: mobilevil on August 07, 2017, 05:27:22 am
But apache still refuse to load the dll(renamed to .so)

httpd: Syntax error on line 191 of
C:/httpd-2.4.27-x64-vc14/Apache24/conf/httpd.
conf: Cannot load modules/mod_apache1.so into server: The specified
procedure could not be found.
I am loading it like this

LoadModule mod_apache1 modules/mod_apache1.so
<Location /mod_apache1>
    SetHandler mod_apache1
</Location>
First one is clear, syntax error in the httpd config file in apache
itself.
Second is out of my Apache knowledge.
Quote from: mobilevil on August 07, 2017, 05:42:27 amchecked with the
echo example C:\lazarus\fpc\3.0.2\source\packages\fcl-
web\examples\echo too, it doesn't compile complaining about it
couldn't find the wmecho unit, but project inspector sees the
wmecho.pas correctly, so I copied the files to another folder, removed
wmecho.pas reference in the project and add it back again. They are
now sitting in the same folder.
build, and same identifier Application not found. comment out, and yes
the dll is here.
but apache still refuse to load it, same error, The specified
procedure could not be found.

i am using the config lines suggested by README of the echo project.

LoadModule mod_echo modules/echo.dll
<Location /myapache>
    SetHandler mod_echo
    Order allow,deny
    Allow from all
</Location>
Please report the compilation issue to bugtracker, the .lpi doesn't
contain -Fu path to wmecho module and the .lpr is missing custapache
unit in the uses clause (where the Application object resides).

----------------------------------------------------------------------
mobilevil · 2017-08-07 05:59

Hello,
yes I figured out custapache too, but fpapache actually uses
custapache, seems there is no need to manually uses it?(edit:ok i
tested with simple project and confirmed that i have to use the unit
directly to access it's variables. my pascal memory is getting thin)

and for the apache conf file, it is not really syntax error. the line
number is the first line I added, the LoadModule directive. Apache is
trying to load the module and somehow it failed to find the entry
point.

while checking with the modules came with apache, I found that the
address of the entry points are 32 bit?! but I the apache I am suing
is a X64 build. maybe I will have to test with a 32bit build??

and for the bug report I think I will test with all other web related
examples first.

Thanks for your help.

----------------------------------------------------------------------
mobilevil · 2017-08-07 09:30

some progress. there are httpd13, httpd20, httpd22, and httpd24
folders in
C:\lazarus\fpc\3.0.2\source\packages

I can get apache to load my echo.dll if I change the uses from
  httpd,fpApache,custapache; 
to
  httpd24,fpApache24,custapache24;

but it crashes. from apache error log,

An unhandled exception occurred at $1002B424:
EHTTP: No REQUEST_METHOD passed from server.
  $1002B424
  $1000FE13
  $10011220
  $5FA742E5
  $5FA735FD
  $5FA83E24
  $5FA83EA1
  $5FA7E8BB
  $5FA76955
  $5FA767F2
  $5FA9FF63
  $7587336A
  $77A69902
  $77A698D5


maybe the echo module example is designe d for apache 2.2? so I made a
build without the 24 in the units and tested with apache 2.2. the
error is shown in the browser
Error: Could not determine HTTP module for request ""
Stack trace:
$10010437
$1000FE77
$100111C0
$5FA82465
$5FA828E2
$5FA906AE
$5FA8B2A2
$5FA85205
$5FA854F3
$5FAA07C7
$7016C556
$7016C600
$7587336A
$77A69902
$77A698D5

----------------------------------------------------------------------
mobilevil · 2017-08-07 10:09

the apache module project created from new project is working with
apache 2.2.

I added a action to FPWebModule1 and added some dummy response

procedure TFPWebModule1.TFPWebAction0Request(Sender: TObject;
  ARequest: TRequest; AResponse: TResponse; Var Handled: Boolean);
begin
  AResponse.Content:='hello';
  Handled:=true;
end; 

but I coudln't get it to work with 2.4. I added 24 suffix to httpd,
fpApache and custApache units, and added apr24 in case.
I guess I am using the wrong lib, or the FPC apache 2.4 lib has a bug
so it is not getting the correct parameter?
An unhandled exception occurred at $0015B9C4:
EHTTP: No REQUEST_METHOD passed from server.
  $0015B9C4
  $0013FEB3
  $001412C0
  $5FA742E5
  $5FA735FD
  $5FA83E24
  $5FA83EA1
  $5FA7E8BB
  $5FA76955
  $5FA767F2
  $5FA9FF63
  $7587336A
  $77A69902
  $77A698D5