WARNING: tcpblast is really crude and measures the throuput by sending as much
data as possible. USE CAREFULLY. For much more subtle bandwidth measurements
use Van Jacobson's pathchar if it is available for your system (he promised to
show the sources in May 1997, looks like somewhat delayed...)

New version of tcpblast is based on several versions floating around, mostly on
FreeBSD version (signed: Daniel Karrenberg <dfk@nic.eu.net>). Can be compiled
on Linux with

cc -o tcpblast tcpclast.c

or

make tcpblast

or

make <system>

(try just make to see the list).

Can be (sym)linked to udpblast to make sending UDP data default.


usage: tcpblast [options] destination nblocks

tcpblast/udpblast is a simple tool for probing network and estimating its
throughoutput. It sends nblocks of 1024 B blocks of data to specified
destination host

Options:
-b nnn         socket buf size (default: -1, don't change)
-c             display speed continuously
-d nnn         print dot every nnn blocks, 0 disables (default 1)
-e             add experimental way of calculating throuput
-h, --help     this help
-p nnn         use port # nnn instead of default 9
-r             send random data
-s nnn         block size (default 1024 bytes)
-t             use TCP (default)
-u             use UDP (default if named udpblast)
-V, --version  version
destination    host name or address
nblocks        number of blocks (1..9999)


Changes:

- setting TCP/UDP
- setting block size
- setting buffer size
- sending random data
19960224 version released
19960926 setting port # 
         uploaded to sunsite.unc.edu
19961001 option for setting # of dots per block sent 
         some cleanup
19961002 better description of -b in usage()
         corrected bug in setsockopt (buffer wasn't set)
         for -r buffer still wasn't filled with random data (Pratip K. Banerji <pbanerji@bbn.com>)
         version 961002a
19961003 usage_small() used in same cases instead of usage()
         some help/error messages rearangement
19961028 getopt from GNU libc 961017 included
         #include <errno.h>
         compiles+links on Solaris 0.5
         more files, Makefiles and such
19970119 -c option for continuous speed display
         either port # or name can be used with -p
         SunOS (4.1.3) compile target works
19981108 included DEC OSF/1 changes from Arun Moorthy <moorthy@cs.iitm.ernet.in> (sent Feb 97,  sorry..)
         getsockopt() should know how much space can it use for returned parameter, so size must be 4
         output shows data/time and (data-bufsize)/time. far from perfect, take a look
         y2k problem in version number (:
         install target
19981109 printresult in a loop arguments corrected
         -e(xperimental) option
         default port now properly printed
19981112 dist Makefile target
         changed . into - in the package name

TODO:
- port to other unices (it may compile out of the box on some, especially
  GNUish ones - any information welcome)
  Solaris 0.5 done, linked with GNU getopt
  SunOS 4.1.3 done, linked with GNU getopt, +1 dirty hack - how to make it nicer?
  OSF/1 - maybe works
- add even more options
  - sending file contents - -f
- learn more theory and think how to improve accuracy of bandwidth
  measurement (maybe it could be corrected for the buffer size.. - doesn't help much 19981108)
  (-b 1024 gives more reasonable results)
- summarize on ^C (anyway, not needed when -c option used)
- after making it really portable and complicated use autoconf; learn autoconf, it is your chance! (:
- constant display of the averaged speed _of_last_NN_KB_
- man page?
- integrate tcpblast-dfk.tar.gz functionality - two way stream via echo port


BUGS: (send to the address below if found)
- I'm a perfectly bad and careless maintainer


rzm@icm.edu.pl