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Re: Help: fd_set porting to Win32?
From: Kris Katterjohn <katterjohn () gmail com>
Date: Sat, 31 May 2008 12:29:49 -0500

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Hey Mixter,

 mixter () gmail com wrote:
Help is appreciated with any clues on the following
porting fun to MSVC++. "Winsock2.h" defines fd_set as follows:

typedef struct fd_set {
        u_int fd_count;
        SOCKET  fd_array[FD_SETSIZE];
} fd_set;

This typedef struct <name> { ... } <name>; is strange in itself,
but nothing I can possibly change. Now, I have to change some
occurrences of instantiation in Ncat, as follows:

struct fdset_set {
        ...
      typedef struct fd_set master;
      typedef struct fd_set read_fds;
} set[SET_SIZE];

This, in turn, is accepted but won't let me access the "set" members:

                              FD_ZERO(&set[i].read_fds);
                              if(FD_ISSET(set[i].socks4_client, &set[i].read_fds)){

Gives me the following errors:

1>\documents\svn-insecure\ncat\ncat_proxy.c(316) : error C2274:
'function-style cast' : illegal as right side of '.' operator
1>\documents\svn-insecure\ncat\ncat_proxy.c(316) : error C2227: left
of '->fd_count' must point to class/struct/union/generic type
1>\documents\svn-insecure\ncat\ncat_proxy.c(317) : error C2273:
'function-style cast' : illegal as right side of '->' operator


You have a typedef in the struct (which I'm surprised works), so that seems to
 be why you're getting the C2274 error[1].

Please, is there any sane way to deal with fd_set on windows?

Already tried to find out why this does work in nmap, with no luck. I cannot
see what is included differently, plus sys/select.h just isn't there on Win32,
so I have to include winsock2.h which doesn't let me instantiate
fd_set as it was.


nbase_winunix.h defines these before it includes the Windows headers:

#define _WINSOCKAPI_
#define WIN32_LEAN_AND_MEAN

Have you tried defining these, or including nbase.h (which includes
nbase_winunix.h on Windows)?

nsock_internal.h includes nbase.h and also uses fd_set without problem, so
there is hope :)

Thanks!


Thanks,
Kris Katterjohn

[1] http://msdn.microsoft.com/en-us/library/kst1dcx0(VS.80).aspx

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