[flow-tools] Repost of flowtools 0.63 core dump in ftstat.c

[S Dawalt]

  I got this while running flow-report.  It's a divide-by-zero in ftstat.c.
The STD_CALC macro is dividing by zero because rpt->t_recs is zero.  The
divide-by-zero patches noted in a December 3 posting are already applied
to the 0.63 distribution I have.  Below is GDB output with a print of the
rpt struct.

  Thanks.

----------------------- snip ------------------------

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This GDB was configured as "alphaev56-dec-osf4.0e"...
Core was generated by `flow-report'.
Program terminated with signal 8, Arithmetic exception.
Reading symbols from /usr/shlib/libc.so...done.
Loaded symbols for /usr/shlib/libc.so
#0 0x12001fef8 in ftstat_rpt_1_calc (rpt=0x14000e800) at ftstat.c:4876

4876 STD_CALC;
(gdb) bt
#0 0x12001fef8 in ftstat_rpt_1_calc (rpt=0x14000e800) at ftstat.c:4876
#1 0x12001a05c in ftstat_def_calc (active_def=0x140011060) at ftstat.c:3150
#2 0x12000ec90 in main (argc=5, argv=0x11ffff188) at flow-report.c:184
(gdb) print *rpt
$1 = {chain = {sle_next = 0x0}, outs = {stqh_first = 0x14000e140,
stqh_last = 0x14000e140}, out = 0x0, format = FT_STAT_FMT_ASCII,
name = 0x14000e100 "t1", format_name = 0x140003a78 "summary-detail",
scale = 0, tag_mask_src = 0, tag_mask_dst = 0, options = 0,
allowed_options = 255, allowed_fields = 16384, all_fields = 16384,
ftfd = 0x0, xfields = 483, data = 0x14000db60,
f_new = 0x12001e870 <ftstat_rpt_1_new>,
f_accum = 0x12001e908 <ftstat_rpt_1_accum>,
f_calc = 0x12001fe5c <ftstat_rpt_1_calc>,
f_free = 0x120024d0c <ftstat_rpt_1_free>,
f_dump = 0x120020374 <ftstat_rpt_1_dump>, t_ignores = 0, t_recs = 0,
t_flows = 33498, t_octets = 317670881, t_packets = 1646469,
t_duration = 156056728, t_count = 0, avg_pps = 0, min_pps = 0, max_pps = 0,
avg_bps = 0, min_bps = 0, max_bps = 0, time_start = 1042835359,
time_end = 1042865978, recs = 0, idx = 0}
(gdb)


Shane A. Dawalt
********************************************
Network Engineer
Wright State University
Dayton,  OH   45435    USA
Phone:  937-775-4089
Email:  shane.dawalt@wright.edu