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Re: [1.7] IPv6 accept() fails if address_len is < sizeof(sockaddr_in6) [was Re: PATCH /usr/include/X11/Xtrans/Xtranssock.c [WAS: Re: xhost package not compiled for IPv6]]

On 12/08/2009 14:59, Corinna Vinschen wrote:
On Aug 12 14:48, Jon TURNEY wrote:
On 12/08/2009 13:54, Jon TURNEY wrote:
Hmmm... but if it's really the size of the sockname argument which is
causing the accept() to fail, this would be a bug in cygwin's accept()
implementation, as it's supposed to truncate the data written to the
sockname, rather than fail if it won't fit [1]. If that actually is the
case, since we don't actually use the peer address here, the code as
stands is correct (if a little odd).

I suppose I need to write a small test case to look at this...


A couple of small programs which hopefully demonstrate this problem.

(As is, the connection fails, but uncommenting the alternate definition
of cliaddr in listener.c allows it to work)

I'd hazard a guess that perhaps this is because the underlying winsock
accept() doesn't have this truncate behaviour and considers a too-small
address_len an error.

Thanks for the testcase!

Oh, I meant to say "A couple of small programs shamelessly copied from UNIX Network Programming". So don't thank me, thank W. Richard Stevens :-)

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