> From: owner-openssl-us...@openssl.org On Behalf Of Charles Mills
> Sent: Monday, 13 August, 2012 11:32

> Found some things on the Web that led me to believe some 
> programs choke when
> they get IPv6 addresses back from gethostbyname(), so I tried 
> disabling IPv6
> on Windows -- but no improvement.
> 
> I have tried coding a server program more or less following 
> the example in
> the O'Reilly OpenSSL book and the first BIO_do_accept() fails with
> 
> 8276:error:02003AFC:system
> library:getservbyname:reason(2812):.\crypto\bio\b_sock.c:224:s
> ervice='&d'
> 
> which I am going to guess is the same problem.
> 
No, that's not the same problem. That says &d is not a valid 
"service" (which in TCP means port). And it isn't. It looks like 
some calling code was supposed to replace &d with a real value, 
probably a decimal number, but didn't.

> From: owner-openssl-us...@openssl.org
> [mailto:owner-openssl-us...@openssl.org] On Behalf Of CharlesTSR
> Sent: Monday, August 13, 2012 9:15 AM

> I have exactly the same problem as
> http://old.nabble.com/s_server-and-gethostbyname-failure-error
> -td14675962.ht
> ml
> http://old.nabble.com/s_server-and-gethostbyname-failure-error
> -td14675962.ht
> ml
> . I have searched and don't find any replies.
> 
> I run the following command:
> openssl s_server -accept 6514 -cert servercacert.pem -key 
> servercakey.pem
> -state -debug -no_dhe
> 
> OpenSSL responds
> 
> Enter pass phrase for servercakey.pem:
> Loading 'screen' into random state - done Using default temp 
> ECDH parameters
> ACCEPT
> 
> When my client issues BIO_do_connect(conn) then openssl 
> s_server fails with
> 
> gethostbyname failure
> 
According to apps/s_socket.c that occurs if the address from which 
the client connected succeeds in gethostbyaddr (nominally reverse-DNS)
but the resulting name fails in gethostbyname (nominally normal DNS).
In my experience Windows often "enhances" DNS with data it decides 
would be helpful, and its decision isn't always perfect.

> There is nothing particularly unusual about the Windows 7 
> 64-bit system on
> which openssl is running. I have used gethostbyaddr frequently with no
> unexpected errors. I'm using a pre-built Windows distribution 
> of OpenSSL
> 1.0.1c. 
> 
Try a simple test program that does gethostbyaddr on the address 
your client is coming from and gethostbyname on the result, and 
see how they compare to what is correct for your network. Try 
running either your client code or s_client on other machine(s).



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