Wireshark-dev: Re: [Wireshark-dev] TCP dissect issue when app-level message spans multiple TCP
From: "Fernandez, Rafael" <[email protected]>
Date: Thu, 5 May 2011 14:33:04 -0500
Correct. Please look at the message I sent about an hour ago for a detailed explanation of the issue.

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Guy Harris
Sent: Thursday, May 05, 2011 2:26 PM
To: Developer support list for Wireshark
Subject: Re: [Wireshark-dev] TCP dissect issue when app-level message spans multiple TCP packets


On May 5, 2011, at 8:59 AM, Fernandez, Rafael wrote:

> guint get_message_tcpmessage_len(packet_info *pinfo, tvbuff_t *tvb, int offset)
> {
>        guint remaining  = tvb_length_remaining(tvb, offset);
>        guint last_size = tvb_get_letohl(tvb, offset)+MESSAGE_HEADER_SIZE;

So, in your protocol:

        all messages start with a fixed-length header MESSAGE_HEADER_SIZE bytes long, and may have zero or more bytes after that header;

        the first 4 bytes of a message (i.e., the first 4 bytes of the header) are a little-endian value that is the length of the part of the message after the fixed-length header?
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