22-alliance-power-and-light-streetsmarts-gis-database

22: Alliance Power and Light (Streetsmarts GIS Database)

Instructions

Locate the two hosts with the specified hostnames (file 300), which correspond to the target power grid substations. When you've found them, cut the power by writing a value of 0 to #POWR.

For more information see "Network Exploration: Geographic Information Systems" in the second issue of the zine.

Solution

XA (global)

GRAB 300
COPY F X
DROP

LINK 800

LINK 800
LINK 800


MARK DUPE
REPL CHECK
LINK 802
JUMP DUPE


MARK CUT_POWER
COPY M #POWR
HALT

MARK WALK
LINK 801

MARK CHECK
HOST T
TEST X = T
TJMP CUT_POWER
JUMP WALK

XB (global)

NOOP
NOOP
NOOP

GRAB 300
SEEK 1
COPY F X
DROP

LINK 800

LINK 800
LINK 800


MARK DUPE
REPL CHECK
LINK 802
JUMP DUPE


MARK CUT_POWER
COPY 0 M
COPY 0 #POWR
HALT


MARK WALK
LINK 801

MARK CHECK
HOST T
TEST X = T
TJMP CUT_POWER
JUMP WALK

Results

Cycles	Size	Activity
44	45	44