Wednesday, 24 August 2011

Axis2/C Windows binary package and OpenSSL

I deployed Axis2C (1.6.0, Windows binary distribution) on IIS 7.0 running on Windows Server 2008 but simple browser-based test (http://localhost/axis2/services) failed - I got HTTP error 500 in W3SVC log:

#Fields: date time s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) sc-status sc-substatus sc-win32-status time-taken
2011-08-24 09:02:53 ::1 GET /axis2/services - 80 - ::1 Mozilla/5.0+(compatible;+MSIE+9.0;+Windows+NT+6.0;+Trident/5.0) 500 0 0 421

Page in the browser displayed:

An IIS server error occurred
An error occurred while initilizing Axis2/C.

Axis log file showed:

[error] ..\..\util\src\class_loader.c(167) Loading shared library C:\axis2c/lib/axis2_http_sender.dll Failed. DLERROR IS DLL Load Error 126: The specified module could not be found.

I used Process Explorer to find Axis2C DLLs loaded by IIS working process and here they are:

axiom.dll
axis2_engine.dll
axis2_parser.dll
axutil.dll
guththila.dll
mod_axis2_iis.dll
neethi.dll

Some of these modules failed to load axis2_http_sender.dll. I tried to reload aforementioned URL in order to wake up w3wp.exe and make it load Axis2C modules. Process Monitor was filtering w3wp.exe events and I could see that w3wp failed to find libeay32.dll (QueryOpen would return NAME NOT FOUND for all locations listed in PATH environment variable). This dll is a part of OpenSSL and is not included in original Axi2C binary package. I downloaded OpenSSL and, just for a test, placed libeay32.dll in C:\axis2c\lib, where axis2_http_sender.dll resides. This time Process Monitor showed that ssleay32.dll could not be found. This file, just like libeay32, belongs to OpenSSL. I placed it in C:\axis2c\lib and repeated the test. Voila! I got the list of my services listed in the browser which proved that Axi2C was set properly.

Process Explorer now shows the complete list of Axis2C DLLs loaded by w3wp.exe:

axiom.dll
axis2_engine.dll
axis2_http_receiver.dll
axis2_http_sender.dll
axis2_mod_addr.dll
axis2_mod_log.dll
axis2_parser.dll
axutil.dll
guththila.dll
libeay32.dll
ssleay32.dll
mod_axis2_iis.dll
neethi.dll

Conclusion: Axis2C Windows distribution depends on OpenSSL DLLs which are not included in binary package which can be downloaded from Apache Axis2/C Releases page. OpenSSL must be installed separately. Unfortunately, this is not mentioned in Axis2/C manual.

Note: upon installing OpenSSL on your system, path to its binaries (e.g. c:\openssl\bin) should be added to PATH environment variable. Make sure you restart machine after changing environment variables as IIS gets them only upon restart - it does not lookup their update values!

Note: If OpenSSL support is not required, download Axis2C source and built it with OpenSSL disabled (--enable-openssl=no)

References and links:
Axis2/C built with SSL support. axis2_http_sender.dll fails to load
problems running default http server
axis2/c depending on openSSL
re-distribute openSSL dlls with AXIS2/c and patent issue

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