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[ragd]

Hi there,

this is a quick implementation of a small turtle botnet for (at the moment) digging tunnels
The way this works:

• Build a turtle grid, facing the direction in which you want to dig
  
• Start the server on one of the turtles
  
• Start the client on the other turtles
  
• The clients will register with the server one by one (There is a small handshake process going on, so each client takes a small while).
  
• If no new clients answer within a time limit, the client detection will stop and the server command console will open
  
• Enter the command an hit enter. While moving, the server turtle will move slightly earlier than the rest
  
• The client turtles will be locked until the server sends a shutdown.

Currently available commands:

• digger, will ask for a number. the net will then dig the number of blocks
  
• dig, will dig front block
  
• forward, will move the net one block forward
  
• shutdown, will shutdown the software on all registered clients

Please note that this is a very basic implementation, and more of an example than a usable program. Have fun and do whatever you like with it.

Server:

function receiveFrom( nSender, nTimeout )
endTime = os.clock() + nTimeout
while ( os.clock() <= endTime ) do
  senderID, text = rednet.receive( 1 )
  if(senderID == nSender) then
   return text
  end
end
return nil
end
function botnet_send (message)
for number, bot in pairs(clientTable) do
  rednet.send(bot, message)
end
end
rednet.open('right')
clients = 0
clientTable = {}
trys = 0
while true do
print(os.clock(),' botnet_detect')
rednet.broadcast('botnet_detect')
print(os.clock(),' waiting for response')
senderID, text = rednet.receive(10)
if senderID ~= nil and text == "botnet_iamhere" then
  print(os.clock(),' potential client ', senderID, ', acknowledge...')
  os.sleep(1)
  rednet.send(senderID, "botnet_ack")
  ackText = receiveFrom(senderID, 5)
  if( ackText == "botnet_complete" ) then
   print(os.clock(),' acknowledged client ', senderID)
   clients = clients + 1
   clientTable[clients] = senderID
   trys = 0
  end
elseif senderID == nil then
  print(os.clock(),' no answer')
  trys = trys + 1
end

if trys > 1 then
  print(os.clock(),' timeout, no more clients')
  break
end

senderID, text = nil, nil
end
if clients > 0 then
print(os.clock(),' got clients registered, count: ', clients)
while true do
  write('botnet[')
  write(clients)
  write(']: ')
  input = read()
  if input == "shutdown" then
   botnet_send('botnet_shutdown')
   print('bye.')
   error()
  elseif input == "dig" then
   botnet_send('botnet_dig')
  elseif input == "forward" then
   botnet_send('botnet_forward')
  elseif input == "digger" then
   write('Number of Digs: ')
   tempinput = tonumber(read())
   num = 0
   while num < tempinput do
	turtle.dig()
	botnet_send('botnet_dig')
	os.sleep(1)
	turtle.forward()
	botnet_send('botnet_foward')
	os.sleep(1)
	num = num + 1
   end
   print('done.')
  else
   print('unrecognized command')
  end
end

else
print(os.clock(),' got no client registered')
end

Client:

function receiveFrom( nSender, nTimeout )
endTime = os.clock() + nTimeout
while ( os.clock() <= endTime ) do
  senderID, text = rednet.receive( 1 )
  if(senderID == nSender) then
   return text
  end
end
return nil
end
function botnet_receive()
text = receiveFrom(server, 5)
if( text == 'botnet_detect') then
  os.sleep(1)
elseif( text ~= nil ) then
  --[[while true do
   rednet.send(server, "botnet_messageack")
   senderID, ack = rednet.receive(5)
   if( senderID == server and ack == "botnet_ack" ) then
	return true
   end
  end]]
  return text
else
  return nil
end
end
rednet.open('right')
server = -1
trys = 0
while trys < 20 and server == -1 do
senderID, text = rednet.receive(5)

if (text == "botnet_detect") then
  server = senderID
  print(os.clock(),' hello server ', server)
  rednet.send(server, "botnet_iamhere")
  text = receiveFrom(server, 5)
  if( text == "botnet_ack" ) then
   os.sleep(1)
   rednet.send(server, "botnet_complete")
   print(os.clock(),' server acknowledged me!')
   break
  else
   print(os.clock(),' server failed to acknowledge, busy or offline?')
   server = -1
  end
end

if (server == -1) then
  trys = trys + 1
  print(os.clock(),' no server found, try ', trys, ' of 20')
end
end
if server == -1 then
print(os.clock(),' no server, quitting')
error()
end
--mainloop
while true do
text = botnet_receive()
if( text == "botnet_shutdown" ) then
  print(os.clock(), ' botnet shuts down, so do i')
  error()
elseif( text == "botnet_dig") then
  print(os.clock(), ' botnet dig front')
  turtle.dig()
elseif( text == "botnet_forward") then
  print(os.clock(), ' botnet forward')
  turtle.forward()
elseif( text == "botnet_backwards") then
  print(os.clock(), ' botnet backwards')
  turtle.back()
end
end