Wireshark · Wireshark-dev: [Wireshark-dev] Profiles and Configurations

Wireshark-dev: [Wireshark-dev] Profiles and Configurations

From: Fred Marshall <fred@xxxxxxxxxxxxxxxxxxxxxxx>

Date: Fri, 09 Apr 2010 09:41:09 -0700

Chris Maynard's post sure pointed me to the right place it appears! Thanks for that.

But, after going through it carefully and trying things, I'm still confused about profiles and configurations and/or configuration profiles. It doesn't seem to be working very smoothly for me and that's surprising. I'll try to be as clear as possible:

1) I would like to establish, name and Save "sets of settings" (I presume that is a "profile"): interface to be used, filename, ring buffer, promiscuous, capture filter, etc. etc. (I see mention of a Configuration File but don't find such files anywhere - perhaps that's not important).

2) I would like to invoke one of these Saved sets to start a capture.

3) I would like to invoke one of these, make some changes and Save to a new one.

My perspective on a likely process would be:

1) Get Wireshark in a "state" of settings so that it's ready to capture in the manner desired.
Getting there would start by invoking a Saved state, or not, and making manual entries, etc.

2) Save the new "state" with a name so it can be recalled.

3) Invoke a saved state at any time except during a capture.

I'm not trying to reinvent the wheel here and much of what I've said above is likely "obvious" to more experienced users. But, my confusion is exactly about these kinds of steps.

- What is the recommended way to Save a Configuration Profile? How do you start? How do you end?
- What is the recommended way to invoke a Saved Configuration Profile?
- What is the relationship with Interfaces? It seems I can specify an interface and then pull up a profile so that the profile shows up in the status bar but it doesn't change the interface that matches the profile?????

Note that I'm using multiple interfaces and rather expect the interface to be part of the profile. But, maybe I'm wrong on this?

It's the proper sequence of events that seems to be eluding me or just understanding the intent of the design so I can make efficient use of it.
If I figure this out I'd likely contribute to the Wiki and/or Wishlist.

Thanks for your patience,

Fred

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Today's Topics:

   1. Profiles and Configurations (Fred Marshall)
   2. Re: Profiles and Configurations (Maynard, Chris)
   3. time question (Brian Oleksa)
   4. USB URB hex bytes not shown (Maynard, Chris)
   5. Re: USB URB hex bytes not shown (Guy Harris)
   6. Re: time question (Anders Broman)
   7. Re: USB URB hex bytes not shown (Maynard, Chris)


----------------------------------------------------------------------

Message: 1
Date: Wed, 07 Apr 2010 18:00:17 -0700
From: Fred Marshall <fmarshall@xxxxxxx>
Subject: [Wireshark-dev] Profiles and Configurations
To: wireshark-dev@xxxxxxxxxxxxx
Message-ID: <4BBD2AA1.7060106@xxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I'm posting here because it was suggested prior to adding to the wish list.

I'm using multiple interfaces simultaneously and it would be really good 
if I could use a profile or configuration that was predefined and named. 
Now, this capability seems to be there already but I'll be darned if I 
can figure out how to use it reliably.
There appear to be no instructions in this regard.

Is this a reasonable thing to add to the wish list?

Thanks,

fred



------------------------------

Message: 2
Date: Thu, 8 Apr 2010 10:26:49 -0400
From: "Maynard, Chris" <Christopher.Maynard@xxxxxxxxx>
Subject: Re: [Wireshark-dev] Profiles and Configurations
To: 'Developer support list for Wireshark'
	<wireshark-dev@xxxxxxxxxxxxx>
Message-ID:
	<FEA7253CE01175418CE6A9BE162A9155014773A5@xxxxxxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"

Does this help?
http://www.wireshark.org/docs/wsug_html_chunked/ChCustConfigProfilesSection.html
- Chris

-----Original Message-----
From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Fred Marshall
Sent: Wednesday, April 07, 2010 9:00 PM
To: wireshark-dev@xxxxxxxxxxxxx
Subject: [Wireshark-dev] Profiles and Configurations

I'm posting here because it was suggested prior to adding to the wish list.

I'm using multiple interfaces simultaneously and it would be really good 
if I could use a profile or configuration that was predefined and named. 
Now, this capability seems to be there already but I'll be darned if I 
can figure out how to use it reliably.
There appear to be no instructions in this regard.

Is this a reasonable thing to add to the wish list?

Thanks,

fred

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------------------------------

Message: 3
Date: Thu, 08 Apr 2010 10:41:47 -0400
From: Brian Oleksa <oleksab@xxxxxxxxxxxxxxxxxxxxxx>
Subject: [Wireshark-dev] time question
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Message-ID: <4BBDEB2B.80100@xxxxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed


Wiresharkers

I am trying to dissect the time in a particular packet. Here is it's format:

"The time is the source computer's system time in Greenwich Mean Time 
(GMT)." The size is 32 bits or 4 bytes.

What is the best method to use to dissect this time..?? I tired 
this...but did not have any luck:

                        nstime_t t;
                        guint64 msecs_since_the_epoch;
                        struct tm *tmp;
                        msecs_since_the_epoch = tvb_get_ntoh64(tvb, offset);
                        t.secs = msecs_since_the_epoch / 1000;
                        t.nsecs = (msecs_since_the_epoch % 
1000)*1000000; /* milliseconds to nanoseconds */
                        tmp = gmtime(&t.secs);

                    if (tmp != NULL)
                        {
                        proto_tree_add_time_format(time_sub_tree, 
hf_helen_time, tvb, offset, 4, &t,
                                "Date: %s %2d, %d %02d:%02d:%02d UTC", 
mon_names[tmp->tm_mon], tmp->tm_mday,
                                tmp->tm_year + 1900, tmp->tm_hour, 
tmp->tm_min, tmp->tm_sec);
                        }
                        offset += 4




Also...I am trying to dissect longitude, latitude and altitude. Here is 
it's format. The size is also 32 bits or 4 bytes.

The <latitude>, <longitude>, and <altitude> fields contain values 
corresponding to GPS information for the MGEN source if it was 
available. The <latitude> and <longitude> fields are encoded as follows:

<fieldValue> = (unsigned long)((<actualValue>+180.0)*60000.0)

The <altitude> field is the direct representation of the altitude value 
available from the source's GPS system.

I tried this but had no luck:

            longitude = tvb_get_ntoh64(tvb, offset);
            longitude = (longitude+180)*60000;
            proto_tree_add_uint_format(mgen_sub_tree, hf_helen_length, 
tvb, offset, 4, 0,
                  "Longitude: %f", longitude);
            offset += 4;



Thanks,
Brian








------------------------------

Message: 4
Date: Thu, 8 Apr 2010 14:28:36 -0400
From: "Maynard, Chris" <Christopher.Maynard@xxxxxxxxx>
Subject: [Wireshark-dev] USB URB hex bytes not shown
To: 'Developer support list for Wireshark'
	<wireshark-dev@xxxxxxxxxxxxx>
Message-ID:
	<FEA7253CE01175418CE6A9BE162A9155014773AD@xxxxxxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"

For DLT_USB_LINUX, is there any good reason why the pcap_usb_header information (from libpcap's pcap/usb.h file) is only displayed in the "packet details" pane, but the hex bytes don't appear in the "packet bytes" pane?  (See attached sample capture file containing a single frame depicting this.)

Using SVN 32429 on Windows XP SP3 (32-bit).
- Chris


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Message: 5
Date: Thu, 8 Apr 2010 11:34:29 -0700
From: Guy Harris <guy@xxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] USB URB hex bytes not shown
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Message-ID: <07886FFF-BDD9-4DBA-9B75-512126119FAC@xxxxxxxxxxxx>
Content-Type: text/plain; charset=windows-1252


On Apr 8, 2010, at 11:28 AM, Maynard, Chris wrote:

For DLT_USB_LINUX, is there any good reason why the pcap_usb_header information (from libpcap?s pcap/usb.h file) is only displayed in the ?packet details? pane, but the hex bytes don?t appear in the ?packet bytes? pane?  (See attached sample capture file containing a single frame depicting this.)

The reason is that, for better or worse, that's treated by the Wiretap library code that reads it as a "pseudo-header".

Whether that's a *good* reason is another matter.

Note that the data in question is in the host byte order of the machine on which the capture was done, so if the data were to be fetched from a tvbuff, it would have to be fetched in that byte order.  That information is available (although it gets more complicated with pcap-ng, as the byte order is per-section, *not* per-interface, so, for example, if multiple pcap-ng captures, including one or more USB interfaces, were to be merged, the pcap_usb_header information would have to be put into the appropriate byte order when writing the capture).


------------------------------

Message: 6
Date: Thu, 08 Apr 2010 20:37:18 +0200
From: Anders Broman <a.broman@xxxxxxxxx>
Subject: Re: [Wireshark-dev] time question
To: wireshark-dev@xxxxxxxxxxxxx
Message-ID: <4BBE225E.1070409@xxxxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Brian Oleksa skrev 2010-04-08 16:41:

Wiresharkers

I am trying to dissect the time in a particular packet. Here is it's format:

"The time is the source computer's system time in Greenwich Mean Time
(GMT)." The size is 32 bits or 4 bytes.

What is the best method to use to dissect this time..?? I tired
this...but did not have any luck:

                         nstime_t t;
                         guint64 msecs_since_the_epoch;
                         struct tm *tmp;
                         msecs_since_the_epoch = tvb_get_ntoh64(tvb, offset);

Well you are fetching 8 bytes not four...

                         t.secs = msecs_since_the_epoch / 1000;
                         t.nsecs = (msecs_since_the_epoch %
1000)*1000000; /* milliseconds to nanoseconds */
                         tmp = gmtime(&t.secs);

                     if (tmp != NULL)
                         {
                         proto_tree_add_time_format(time_sub_tree,
hf_helen_time, tvb, offset, 4,&t,
                                 "Date: %s %2d, %d %02d:%02d:%02d UTC",
mon_names[tmp->tm_mon], tmp->tm_mday,
                                 tmp->tm_year + 1900, tmp->tm_hour,
tmp->tm_min, tmp->tm_sec);
                         }
                         offset += 4




Also...I am trying to dissect longitude, latitude and altitude. Here is
it's format. The size is also 32 bits or 4 bytes.

The<latitude>,<longitude>, and<altitude>  fields contain values
corresponding to GPS information for the MGEN source if it was
available. The<latitude>  and<longitude>  fields are encoded as follows:

<fieldValue>  = (unsigned long)((<actualValue>+180.0)*60000.0)

The<altitude>  field is the direct representation of the altitude value
available from the source's GPS system.

I tried this but had no luck:

             longitude = tvb_get_ntoh64(tvb, offset);

Well you are fetching 8 bytes not four...

             longitude = (longitude+180)*60000;

Assuming the field on the wire is encoded as:

<fieldValue>  = (unsigned long)((<actualValue>+180.0)*60000.0)

shouldn't that be (double)actualValue= (longitude/60000.0)-180

             proto_tree_add_uint_format(mgen_sub_tree, hf_helen_length,
tvb, offset, 4, 0,
                   "Longitude: %f", longitude);
             offset += 4;



Thanks,
Brian






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------------------------------

Message: 7
Date: Thu, 8 Apr 2010 14:45:49 -0400
From: "Maynard, Chris" <Christopher.Maynard@xxxxxxxxx>
Subject: Re: [Wireshark-dev] USB URB hex bytes not shown
To: 'Developer support list for Wireshark'
	<wireshark-dev@xxxxxxxxxxxxx>
Message-ID:
	<FEA7253CE01175418CE6A9BE162A9155014773AE@xxxxxxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"

Hmm, I'm still confused.  Byte order aside, the "packet details" pane contains information from the "pseudo-header".  For example, in the example capture file I sent, the URB id filed is displayed as:

	URB id: 0xffff810024eaab40

But nowhere in the "packet bytes" pane do those bytes appear.

Contrast this with the attached example of a Linux cooked capture where the cooked pseudo header is present and the hex bytes are also shown.  Selecting each of the fields within the cooked header highlights the corresponding bytes in the "packet bytes" pane.  I guess I would expect the same behavior for DLT_USB_LINUX as we get for DLT_LINUX_SLL.

- Chris

-----Original Message-----
From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Guy Harris
Sent: Thursday, April 08, 2010 2:34 PM
To: Developer support list for Wireshark
Subject: Re: [Wireshark-dev] USB URB hex bytes not shown

On Apr 8, 2010, at 11:28 AM, Maynard, Chris wrote:

For DLT_USB_LINUX, is there any good reason why the pcap_usb_header information (from libpcap's pcap/usb.h file) is only displayed in the "packet details" pane, but the hex bytes don't appear in the "packet bytes" pane?  (See attached sample capture file containing a single frame depicting this.)

The reason is that, for better or worse, that's treated by the Wiretap library code that reads it as a "pseudo-header".

Whether that's a *good* reason is another matter.

Note that the data in question is in the host byte order of the machine on which the capture was done, so if the data were to be fetched from a tvbuff, it would have to be fetched in that byte order.  That information is available (although it gets more complicated with pcap-ng, as the byte order is per-section, *not* per-interface, so, for example, if multiple pcap-ng captures, including one or more USB interfaces, were to be merged, the pcap_usb_header information would have to be put into the appropriate byte order when writing the capture).
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