[Winpcap-users] pcap_fopen_offline not exported?

[Gianluca Varenni]

----- Original Message ----- 
From: "Fish" <fish at infidels.org>
To: <winpcap-users at winpcap.org>
Sent: Thursday, July 24, 2008 9:36 AM
Subject: RE: [Winpcap-users] pcap_fopen_offline not exported?


>
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> Okraszewski,Marcin wrote:
>
> [...]
>> Maybe Winpcap could export an alternative function which
>> would work on file descriptor?
>
> No. Use Win32 HANDLEs instead, not CRT file descriptors.
>
>
>> This shouldn't have the CRT compatibility issues. It
>> could look like this:
>
> Actually it will. :(
>
>
>> pcap_t* pcap_fdopen_offline(int fd, char *errorbuf) {
>>     FILE *file = _fdopen(fd, "rb");
>>     if ( file == NULL ) {
>>         strerror_s(errorbuf, PCAP_ERRBUF_SIZE, errno);
>>         return NULL;
>>     }
>>     return pcap_fopen_offline(file, errorbuf);
>> }
>>
>> Then also it could override pcap_fopen_offline calls with a macro:
>>
>> #define pcap_fopen_offline(file, errorbuf) \
>>     pcap_fdopen_offline(_fileno(file), errorbuf)
>>
>> This together would make it compatible with libpcap.
>
> Actually it won't, but you're on the right track.
>
> Try this instead:
>
>
>  pcap_t* pcap_openw32_offline(HANDLE h, char *errorbuf) {
>    int fd = _open_osfhandle(h);
>    FILE *file = _fdopen(fd, "rb");
>    if ( file == NULL ) {
>      strerror_s(errorbuf, PCAP_ERRBUF_SIZE, errno);
>      return NULL;
>    }
>    return pcap_fopen_offline(file, errorbuf);
>  }
>
>
> (p.s. the're also "_get_osfhandle" too in case you need it)
>

this could work as long as you can get a FILE* handle out of a win32 HANDLE. 
I've never tried myself, it looks a bit scary to me...

Have a nice day
GV

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