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Re: Next issue (Re: Help: fd_set porting to Win32?)
From: bensonk () acm wwu edu
Date: Sun, 1 Jun 2008 10:39:22 -0700

Just as a warning, I don't use windows, and I haven't tested this,
but...

I found a page that talks about winsock vs bsd sockets a bit.  (Keeping
in mind that winsock actually has bsd code under the covers.)  It might
help you out, here's the URL:
http://tangentsoft.net/wskfaq/articles/bsd-compatibility.html

The section about fcntl() says the following:
The Unix fcntl() call has no direct equivalent under Winsock. Where
necessary, similar functionality exists in Winsock's ioctlsocket() call.
For example, the equivalent of using Unix's fcntl() to set a socket's
O_NONBLOCK flag is setting the FIONBIO flag with Winsock's
ioctlsocket().

Grepping through the nmap source code, I found fcntl was used a number
of places.  I picked one at random, it happened to be tcpip.cc.  Here's
the section fcntl appears in:

#ifdef WIN32
u_long one = 1;
if(sd != 501) // Hack related to WinIP Raw Socket support
  ioctlsocket (sd, FIONBIO, &one);
#else
int options;
/*Unblock our socket to prevent recvfrom from blocking forever
  on certain target ports. */
options = O_NONBLOCK | fcntl(sd, F_GETFL);
fcntl(sd, F_SETFL, options);
#endif //WIN32


So, it looks to me like you will have to rewrite ncat with a bunch of
conditional blocks to get around the fact that Microsoft decided to
change the sockets API on their platform.  

Hope this helps. 
Benson


On Sun, Jun 01, 2008 at 11:55:24AM +0200,  mixter () gmail com wrote:
Next issue, fcntl() and gethostbyname() and
several related definitions cannot be found on windows. :(

Even though I already include nbase/nbase.h in the file
in question (ncat_connect.c), and verified that this
includes win32 compatibility code and with it, fcntl.h.

Directly including fcntl.h doesn't work either.

How can this be, i.e. if I already, specifically
#include "nbase/nbase.h"
from that file, and it still doesn't know fcntl,
which seems working in nmap?

Including any other nbase, or nsock, header,
does not work either...

Thanks for any insight.

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