a lan or link that is running a linkdelay on a linux node.

shaping in dummynet.

some details can be found in the advanced tutorial that I wrote up.
See this link:

http://www.emulab.net/tutorial/docwrapper.php3?docname=advanced.html#Tracing

The basic idea is that each virt_lan entry gets a couple of new slots
describing the type of tracing that is desired.

  traced tinyint(1) default '0',
  trace_type enum('header','packet','monitor') NOT NULL default 'header',
  trace_expr tinytext,
  trace_snaplen int(11) NOT NULL default '0',
  trace_endnode tinyint(1) NOT NULL default '0',

There is a new physical table called "traces" that is a little bit
like the current delays table. A new tmcd command returns the trace
configuration to the client nodes (tmcd/common/config/rc.trace).

The delays table got a new boolean called "noshaping" that tells the
delay node to bridge, but not set up any pipes. This allows us to
capture traffic at the delay node, but without much less overhead on
the packets.

The pcapper got bloated up t...

I fixed a couple of minor problems, but mostly this worked fine. Note that
I have tested this with the installed perl, *NOT* perl 5.8. I am just
making sure this stuff gets committed before too much more bitrot sets in.

state machine (state). All of the stuff that was previously handled by
using batchstate is now embedded into the one state machine. Of
course, these mostly overlapped, so its not that much of a change,
except that we also redid the machine, adding more states (for
example, modify phases are now explicit. To get a picture of the
actual state machine, on boss:

		stategraph -o newstates EXPTSTATE
		gv newstates.ps

Things to note:

* The "batchstate" slot of the experiments table is now used solely to
  provide a lock for batch daemon. A secondary change will be to
  change the slot name to something more appropriate, but it can
  happen anytime after this new stuff is installed.

* I have left expt_locked for now, but another later change will be to remove
  expt_locked, and change it to active_busy or some such new state name in
  the state machine. I have removed most uses of expt_locked, except those
  that were necessary until there is a new state to replace it.

* These new changes are an implementation of the new state machine,
  but I have not done anything fancy. Most of the code is the same as
  it was before.

* I suspect that there are races with the batch daemon now, but they
  are going to be rare, and the end result is probably that a
  cancelation is delayed a little bit.

Allow base experiment to be changed when the experiment is swapped
out. That is, change virt_lans only. Eventually use this from the web
interface so that we can present a page to edit the traffic shaping
parameters on non-active experiments as well as active experiments.

using the new assign, and captures Leigh's linkdelays work.

(the base experiment). Also do the proper calculation when inserting
into virt_lans for delay and plr, which is different then when
updating the delays table directly. Change from using ssh to using the
event system to make the change on the node.

The DB will now hold Kbs.

Make sure they specify at least one of -d, -b, or -l, so we don't get that stupid db error from the missing query parts!

hold separate values for each of the two pipes. This allows us to
treat the links asymmetrically with respect to the delay node
configuration. Changes to tmcd to return the expanded info, and rework
(completely) delay_config to allow user to change the duplex
characteristics (just like before), or just simplex characteristics by
specifying the pipe number. By convention (I invented) pipe 0 is
traffic coming in on iface0. Of course, none of the front end stuff
has been changed, so the changing a single pipe does not cause
anything in virt_lans to be changed, so those changes will be lost at
swapout. Also get rid of all the ssh'ed pipe config stuff in
delay_config. Instead, add a client side script called update_delays
to /etc/testbed on the experiment nodes. After updating the delays
table, just ssh over and run that script, which calls the existing
code. Less distribution of knowledge.

Lots of small changes for turning our 'require lib*' lines into 'use lib*' lines. Proper modules declare themselves as a package, and use Exporter to export the names of the subroutines that should be visible from the outside world. Many of ours didn't do that, it was just a file with a bunch of subs in it. So now I've fixed many of them to be proper, and removed the requires and 'push(@INC,...)' hacks and changed it to the proper 'use lib @prefix@/lib/;' and use lib*.

Updated to use ifaces instead of cards in delays table, since something stopped filling in card fields...

Fixed delay config, and had to add it to configure since it needs to know the path to its libdb.pm and needs the database.