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Packet name is not displaying for few packets under info column

asked 2018-11-27 04:18:56 +0000

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Hi,

we are migrating existing plugin code from wireshark 1x to 2x. when we try to open the collected pcap file using wireshark 2.6.3, it doesnt display packet name under info tab where as it is displaying in 1.12.8,btw this issue is not observed for all packets. btw used code to print column info is:

col_add_fstr(pinfo->cinfo, COL_INFO, "%s", "NRACH_INDICATION");

please help me in understanding the issue.

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answered 2018-11-27 18:20:46 +0000

Jaap gravatar image

You probably have a construct like this:

if (tree)
{
     ....
     col_add_fstr(pinfo->cinfo, COL_INFO, "%s", "<text>");
     ....
}

This prevents the column info to be set, when relevant. Remove the condition and see what happens.

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there is no condition as you mentioned above. it is the first statement under any case statement

case NRACH_INDICATION:
{
    col_add_fstr(pinfo->cinfo, COL_INFO, "%s", "NRACH_INDICATION");
}

...

Kuru4634 gravatar imageKuru4634 ( 2018-11-28 07:36:25 +0000 )edit

As all the other dissectors in Wireshark seem to able to update the info column as required, it looks like the issue is in your code. Without access to the source all we can really say is that you aren't calling the function you show when you should be. You'll have to break out a debugger and see what's happening on the frames that are affected.

grahamb gravatar imagegrahamb ( 2018-11-28 10:23:57 +0000 )edit

@Kuru4634: The fact that it's the first statement under the case statement says nothing. The whole switch-case construct could be wrapped in an 'if (tree)' condition. As @grahamb says, without access to your source we cannot tell.

Jaap gravatar imageJaap ( 2018-11-28 12:14:05 +0000 )edit

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Asked: 2018-11-27 04:18:56 +0000

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Last updated: Nov 27