An application that only includes openssl/ssl.h from OpenSSL
1.0.0 and doesn't use winsock.h will run into problems on Windows,
since the dtls1.h header file includes the winsock.h header file long
after the ossl_typ.h header file was loaded.
The latter includes a couple of #undefs needed to work around symbol
naming collisions, the most important one being "#undef X509_NAME".
As a result, compiling the application fails with strange errors, e.g.
openssl\src\crypto\x509name.h(28) : error C2059: syntax error : '('
openssl\src\crypto\x509name.h(31) : error C2059: syntax error : '}'
openssl-win32\vc9\inc32\openssl/x509v3.h(192) : error C2059: syntax error : '('
openssl-win32\vc9\inc32\openssl/x509v3.h(200) : error C2059: syntax error :
'type'
openssl-win32\vc9\inc32\openssl/x509v3.h(204) : error C2059: syntax error : '}'
openssl-win32\vc9\inc32\openssl/x509v3.h(205) : error C2059: syntax error : '}'
openssl-win32\vc9\inc32\openssl/x509v3.h(211) : error C2061: syntax error :
identifier 'GENERAL_NAME'
I'm not sure what the right fix would be. Since the dtls1.h header
file is included unconditionally in ssl.h, perhaps moving the winsock.h
import into ossl_typ.h might be a solution. The #undefs would then work
as intended again.
For the application in question (pyOpenSSL, an OpenSSL Python extension),
the work-around is to #include <winsock.h> prior to including
openssl/ssl.h, so that the #undefs can take effect.
Thanks,
--
Marc-Andre Lemburg
eGenix.com
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