Wireshark · Wireshark-dev: Re: [Wireshark-dev] Extract bytes from a tvbuff_t

[Rion Carter <rion@xxxxxxxxxx>]

Thank you! I've been in C# for too many years. I'll try that when I get back to my desk.

Rion

Sent from my BlackBerry 10 smartphone.

From: ronnie sahlberg

Sent: Saturday, May 25, 2013 15:12 PM

To: Developer support list for Wireshark

Reply To: Developer support list for Wireshark

Subject: Re: [Wireshark-dev] Extract bytes from a tvbuff_t

fwrite(extracted, sizeof(extracted), 1, file)

extracted is a pointer so sizeof(extracted) is the size of pointers on
your platform. Often 4 on 32-bit platforms and 8 on 64-bit.

You need something like this :
fwrite(extracted, tvb_get_length(tvb, 0), 1, file)

On Sat, May 25, 2013 at 1:42 PM, Rion Carter <rion@xxxxxxxxxx> wrote:
> Hi,
>
> I'm trying to extract raw bytes from a tvbuff_t and am not having much luck.
> As a simple test I have code which tries to extract the bytes and write it
> to a file. When I compile and run I get an output file with only 4 bytes in
> it when I know there is more (extracting certificates).
>
> Here is what I've got. Any help is appreciated:
>
> guint8* extracted = (guint8*)ep_tvb_memdup(tvb, 0, -1);
> fwrite(extracted, size of extracted), 1, file);
>
> It's been awhile since I used c file io, and I'm pretty new to Wireshark
> dev. I may be missing obvious or going about this in the wrong fashion.
>
> Rion
>
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