Re: wiretap function wtap_open_offline fails with SIGSEGV

[Martin Sehnoutka <msehnout () redhat com>]

On 05/03/2018 10:52 AM, Guy Harris wrote:
> You must initialize libwiretap before you use it.
>
> Call
>
>       wtap_init(TRUE);
>
> first.
>
> Note also that the libwiretap API is subject to change, so don't rely on it not changing out from under you in future 
> Wireshark releases.

It does work, but only with wtap_init(FALSE). In case of TRUE it fails
again, this time with this bt:
#0  0x0000000000000000 in ?? ()
#1  0x00007ffff71cf60a in report_failure (
    msg_format=msg_format@entry=0x7ffff71df960 "Couldn't load plugin
'%s': %s") at report_message.c:52
#2  0x00007ffff71d48b9 in scan_plugins_dir
(plugins_module=plugins_module@entry=0x604060 = {...},
    dirpath=<optimized out>, type=type@entry=WS_PLUGIN_WIRETAP,
append_type=append_type@entry=1)
    at plugins.c:142
#3  0x00007ffff71d49ee in plugins_init
(type=type@entry=WS_PLUGIN_WIRETAP) at plugins.c:267
#4  0x00007ffff7b6d822 in wtap_init (load_wiretap_plugins=1) at wtap.c:1442
#5  0x0000000000400dc1 in main (argc=2, argv=0x7fffffffe4c8) at
../main.cpp:38

Anyway, I would like to read the drop count value from a pcapng record,
but it is not present.

    ...
    gboolean ok = wtap_read(wth, &err, &errinfo, &data_offset);
    wtap_rec *rec = wtap_get_rec(wth);
    cout << "\ndrop count: ";
    if (rec->presence_flags & WTAP_HAS_DROP_COUNT)
    ...

Is it implemented?

Regards,
-- 
Martin Sehnoutka | Associate Software Engineer
PGP: 5FD64AF5
UTC+1 (CET)
RED HAT | TRIED. TESTED. TRUSTED.

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