Wireshark-bugs: [Wireshark-bugs] [Bug 11047] New: duration calculation using appflow flow record
| Bug ID |
11047
|
| Summary |
duration calculation using appflow flow record field type 154 and 155 incorrect
|
| Product |
Wireshark
|
| Version |
1.12.3
|
| Hardware |
x86-64
|
| OS |
Windows 7
|
| Status |
UNCONFIRMED
|
| Severity |
Normal
|
| Priority |
Low
|
| Component |
Dissection engine (libwireshark)
|
| Assignee |
bugzilla-admin@wireshark.org
|
| Reporter |
csherrit@yahoo.com
|
Created attachment 13501 [details]
example citrix/netscaler appflow data
Build Information:
Version 1.12.3 (v1.12.3-0-gbb3e9a0 from master-1.12)
Copyright 1998-2015 Gerald Combs <gerald@wireshark.org> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (64-bit) with GTK+ 2.24.23, with Cairo 1.10.2, with Pango 1.34.0, with
GLib 2.38.0, with WinPcap (4_1_3), with libz 1.2.5, with SMI 0.4.8, with c-ares
1.9.1, with Lua 5.2, without Python, with GnuTLS 3.2.15, with Gcrypt 1.6.2,
without Kerberos, with GeoIP, with PortAudio V19-devel (built Jan 7 2015),
with
AirPcap.
Running on 64-bit Windows 7 Service Pack 1, build 7601, with WinPcap version
4.1.3 (packet.dll version 4.1.0.2980), based on libpcap version 1.0 branch
1_0_rel0b (20091008), GnuTLS 3.2.15, Gcrypt 1.6.2, without AirPcap.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, with 8061MB of physical
memory.
Built using Microsoft Visual C++ 10.0 build 40219
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
--
when viewing cflow records in wireshark , a calculation is done to comute
duration of a flow record using field type 154 (flowStartMicroseconds) and
field type 155 (flowEndMicroseconds) . Although whole date and time in seconds
are correct the "microseconds" are miscalculated. The calculation being done is
as if the fields are NTP structures
struct ntp_time_t {
uint32_t second; //seconds have elapsed since Jan 1, 1900
uint32_t fraction; // 2**32 of second
};
however the structure really is something like
struct appflow_microsecond_time_t {
uint32_t second; //seconds have elapsed since Jan 1, 1900
uint32_t fraction; // number of microseconds
};
where the fractional part is already in microseconds not an NTP fraction.
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