Hi all! Is there any kind of limitation when it comes to filters (also color filters)? Thanks to MS I currently have a filter with more than 18k chars. Wireshark is not complaining but I'd like to make sure nothing get's lost.... Cheers Andreas
A "vintage" answer from 2012.
There is the dftest command for testing display filters.
Shell script to make a long test filter.
#!/bin/sh
# chuckc - Fri Apr 24 14:53:58 CDT 2020
# Make a very long display filter
echo -n "(ip or tcp or udp or "
INDEX=0
while [ $INDEX -lt 1000 ]
do
echo -n "frame contains \"$INDEX data: 123456789abcdefghijklmnopqrstuvwxyz\" or "
INDEX=`expr $INDEX + 1`
done
echo "frame contains \"$INDEX EOF: 123456789abcdefghijklmnopqrstuvwxyz\")"
Save output to a file then read into dftest:
$ ./make_dfilter_long > dfilter.long
$ dftest `cat ./dfilter.long` | tail -10
04000 ANY_CONTAINS reg#0 contains reg#999
04001 IF-TRUE-GOTO 4009
04002 READ_TREE frame -> reg#0
04003 IF-FALSE-GOTO 4009
04004 ANY_CONTAINS reg#0 contains reg#1000
04005 IF-TRUE-GOTO 4009
04006 READ_TREE frame -> reg#0
04007 IF-FALSE-GOTO 4009
04008 ANY_CONTAINS reg#0 contains reg#1001
04009 RETURN
$
Hi Bubba, thnx for the answer but it refers to an 8y old version and there have been some more in the meanwhile and I don't want to guess if this is still true or not.
Is there anyone from the Devel side who could let me know about the STRG-VAR-Side?
I'm also coding but not C(++) so I don't know anything about the Size of the Var used and how this is handled in WS.
As mentioned before I do not see any complains from WS but I need to to be sure that the whole String get's evaluated.
Not being on the safe side means not knowing anything - and guessing is unacceptable, especially when it comes to deep dives.
Many Thanks!
Cheers Andreas
Doesn't seem to be a fixed array length - grow buffer if not big enough.
ui/filter_files.c
-------------------------
if (filt_expr_index >= filt_expr_len) {
/* Filter expressioin buffer isn't long enough; double its length. */
filt_expr_len *= 2;
filt_expr = (char *)g_realloc(filt_expr, filt_expr_len + 1)
}
Asked: 2020-04-24 16:50:29 +0000
Seen: 300 times
Last updated: Apr 24 '20
