NAME¶
trafshow - full screen show network traffic
SYNOPSIS¶
trafshow [
-vpnb] [
-a len] [
-c conf]
[
-i name] [
-s str] [
-u port] [
-R refresh] [
-P purge] [
-F file |
expr]
DESCRIPTION¶
TrafShow is a simple interactive program that gather the
network
traffic from all libpcap-capable interfaces to accumulate it in memory
cache, and then separately display it on appropriated curses window in
line-narrowed manner as a list of network flows sorted by throughput. Display
updates occurs nearly in real time, asynchronously from the data collecting.
It look like a
live show of traffic flows. Any kind of network traffic
are mixed together in the one live-show screen, an Ethernet, IP, etc.
Hint: Please press `
H' key inside a show to get brief help!
The IP traffic can be
aggregated by netmask prefix bits and service ports
to reorganize a heap of trivial flows into the treelike hierarchies suitable
for human perception. The user can glance over the list of resulting flows and
select at their to browse detail. So you can deepen into the traffic
inheritance hierarchy and inspect the packets of each trivial flow in variety
of presentations: raw-hex, ascii, time-stamp.
The program make aggregation automatically when number of flows will exceed some
reasonable amount. Just a few seconds after launch may be required for
adaptation to your volume of traffic. Use
-a len option (see
below) to overwrite the default behaviour.
TrafShow also listens on UDP port (9995 by default) for diverse feeders
of
Cisco Netflow and then separately display the collected data
in the same manner as described above. The following versions of Netflow are
currently supported: V1, V5, V7. Use
-u port option (see below)
to overwrite the default behaviour.
This program may be found wonderful at lest to locate suspicious traffic on the
net very quickly on demand, or to evaluate real time traffic bandwidth
utilization, in a simplest and convenient environment. But it is not intended
for collecting and analysis of the network traffic for a long period of time,
nor for billing!
The program pretend to be IPv6 compatible and ready to using, but it is not
tested enough. You can define INET6 to do so.
OPTIONS¶
- -v
- Print detailed version information and exit.
- -p
- Do not put interface(s) into promiscuous mode.
- -n
- Do not convert numeric values to names (host addresses, port numbers,
etc.). The mode can be toggled On/Off during a show by pressing the `
N' key.
- -b
- To place a backflow entries near to the main streams in the sorted list of
traffic flows.
Note: this mode can raise the system load dangerously high because
it take a lot of CPU cycles!
- -a len
- To aggregate traffic flows using IP netmask prefix len. This option
also turn on service ports aggregation. The len expected as number
of bits in the network portion of IP addresses (like CIDR). The
aggragation len can be changed during a show by pressing the `
A' key, and turned Off by empty string.
Hint: Please use 0 to reduce output just for network
services.
- -c conf
- Use alternate color config file instead of default
/etc/trafshow.
- -i name
- Listen on the specified network interface name. If unspecified,
TrafShow collect data from all network interfaces,
configured UP in the system. In the last case the system must
supply enough number of packet capture devices (like /dev/bpf#).
- -s str
- To search and follow for list item matched by string, moving
the cursor bar. The found item try to stay highlighted. The mode
can be turned Off by ` Ctrl-/' key press or [re]entered
again by ` /' key directly in the live show.
- -u port
- Listen on the specified UDP port number for the Cisco
Netflow feed. The default port number is 9995.
Hint: Please use 0 to disable this functionality.
- -R refresh
- Set the refresh period of data show to seconds, 2
seconds by default. This option can be changed during a show by pressing
the ` R' key.
- -P purge
- Set the expired data purge period to seconds, 10
seconds by default. This option can be changed during a show by pressing
the ` P' key.
- -F file
- Use file as input for the filter expression.
- expr
- Select which packets will be displayed. If no expression is given,
all packets on the net will be displayed. Otherwise, only packets for
which expression is `true' will be displayed.
The filter expression can be changed during a show by pressing the `
F' key, and turned Off by empty string.
Please see tcpdump(1) man page for syntax of filter
expression.
FILES¶
- /etc/trafshow
- The default colors configuration file if any.
- $HOME/.trafshow
- The personal file with the user defined colors.
COLORS¶
If
TrafShow has been compiled with modern curses libraries such as
Slang or
Ncurses it been able to show colored traffic on the
color-capable terminal. Hopefully, no special actions required to install them
because your system has it by default (leastwise last years).
The syntax of
TrafShow color configuration file as follow:
- default fcolor:bcolor
- Set the default screen background color-pair
- port[/proto] fcolor:bcolor
- Set color pattern by service port
- [proto] src[/mask][,port]
dst[ /mask][,port]
fcolor:bcolor
- Set color pattern by pair of source and destination addresses
The tokens
*,
any, or
all matchs
ANY in the pattern.
Where
fcolor is foreground color and
bcolor is background color.
The fcolor and bcolor may be one of the following:
- black red green yellow blue magenta cyan white
- It posible to indicate color as number from 0 to 7.
The upper-case
Fcolor mean
bright on. The upper-case
Bcolor
mean
blink on.
SEE ALSO¶
pcap(3), tcpdump(1),
bpf(4)
ACKNOWLEDGEMENTS¶
Thanks to Van Jacobson <van(at)helios.ee.lbl.gov> and Steven McCanne
<mccanne(at)helios.ee.lbl.gov>, all of Lawrence Berkeley Laboratory,
University of California, Berkeley. Special thank to Jun-ichiro itojun Hagino
<itojun(at)iijlab.net> for IPv6 patches.
AUTHOR¶
Vladimir Vorobyev <bob(at)turbo.nsk.su>.
BUGS¶
Depending of traffic volume,
TrafShow can take a lot of CPU cycles and
memory.
It is impossible to use packet matching
expressions in the NetFlow mode.