Nmap Development: Re: Help: fd_set porting to Win32?

[Kris Katterjohn <katterjohn () gmail com>]

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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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