Jay McGavren's Journal

2009-07-18

DevHouse, low-tech...

Wanted something to run on the projector during Phoenix DevHouse that would give everyone a shared playground. It had to be simple enough to not interfere with people, though, and I didn’t want people to have to download clients or a bunch of other software…

I’d heard about netcat before, but it was only a few days ago that I stumbled across another article on it, including setting it up as a server/listener. Thought it would be perfect for the job, and it was - as a client. The listener didn’t let people connect concurrently in either TCP or UDP modes, so I simply grabbed a socket example from the Programming Ruby book and fired it up, then posted directions on connecting. Here’s the result…

jay@dandelion:~/Projects
$ echo "Agh, even a ruby UDP listener is blocking the port." | nc localhost 12345
^C punt!
jay@dandelion:~/Projects
$ echo "And though I tried to install MacPorts netcat, it's like there's a conflict with the Apple version." | nc localhost 12345
^C punt!
jay@dandelion:~/Projects
$ nc localhost 12345
Want your text to appear up here? "nc 172.16.1.61 12345"
^C punt!
jay@dandelion:~/Projects
$ nc localhost 12345
But uh, don't forget to ctrl-C to clear the socket.
^C punt!
jay@dandelion:~/Projects
$ ruby udp.rb
add^Cudp.rb:7:in `recvfrom': Interrupt
        from udp.rb:7
        from udp.rb:6:in `loop'
        from udp.rb:6

jay@dandelion:~/Projects
$ ruby udp.rb
adfskh
dfskjh
fdajfads
adsfkj
dfskj
lfkdjsh
tab 1
tab 2
OK, this one doesn't seem to block...
dsafkh
fdksha
#Want your text to appear up here? "nc -u localhost 12121"
adfskj
^Cudp.rb:7:in `recvfrom': Interrupt
        from udp.rb:7
        from udp.rb:6:in `loop'
        from udp.rb:6

jay@dandelion:~/Projects
$ ruby udp.rb
adfshk
afds;kj
nc -u 172.16.1.61 12121
nc -u 172.16.1.61 12121
Want your text to appear up here? "nc -u 172.16.1.61 12121"


Howdy
hi :)
Here's the server code:
require 'socket'
socket = UDPSocket.new
socket.bind("172.16.1.61", 12121)
loop do
  msg, sender = socket.recvfrom(10000)
  host = sender[3]
  print msg
  STDOUT.flush
end
When I bound to '127.0.0.1' I could only connect from localhost, hence the hardcoded IP.
Want your text to appear up here? "nc -u 172.16.1.61 12121"
If you have trouble, ask the nerd with the MacBook.
MCHung in da haus!
Oh, wait, I mean the guy in the GitHub shirt. :)
all weezer, all the time <-- nice


testing
Ok how I do this on a windows machine amrt ass mac users?
like that?
uh, just don't try
 __________________________

 --------------------------
           ^__^
           (oo)_______
            (__)       )/
                ||----w |
                ||     ||
with lasers attached to it's friggin head!
Want your text to appear up here? "nc -u 172.16.1.61 12121"


                                                     )/_
                                           _.--..---"-,--c_
                                      L..'           ._O__)_
                              ,-.     _.+  _  ..--( /           a:f
                                `.-''__.-'  (     _
                                  `'''       `__   /
                                              ')

     ___          ___          ___          ___
    /  /        /  /        /  /        /  /
   /  /::      /  /::      /  /::      /  /:/
  /  /:/:    /  /:/:    /  /:/:    /  /:/
 /  /:/  :  /  /:/  :  /  /:/  :  /  /:/
/__/:/   :/__/:/ __:/__/:/ __:/__/:/
  :  __/  : /  /:/  : /  /:/  :
   :         :  /:/    :  /:/    :
    :         :/:/      :/:/      :
     :         ::/        ::/        :
    __/        __/        __/        __/
       |
  |
  + 
  \.G_.*=.
   `( '/.|
    .>' (_--.
 _=/d   ,^
~~ )-'   '
   / |
smaller fonts
  '  '   a:f
Want your text to appear up here? "nc -u 172.16.1.61 12121"
 _ _ _  _____  _____  _____  _____   ____
| | | || ___ || ___ |(___  )| ___ | / ___)
| | | || ____|| ____| / __/ | ____|| |
 ___/ |_____)|_____)(_____)|_____)|_|
Better? Or too small?

      ----------.................._____________  _  .-.
                                      _____.. . .   | |
                   _____....------""""             uuuuu
 ____....------""""                                |===|
                                                   |===|
                                                   |===|
                                                   |===|
 _a:f____________________________________________ .[__N]. _______


                                             (
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                      .___.            ,-.  __)      NC + a:f
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                                                                                                         GlassGiant.com
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888 888 888888888 88 88 88
88 88 88 88 88 8888888
dammit i came here to code
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MMMMMMMMMMMNmmhyyyyyssssooo++++++++++++/////////++++oosssssyhdmmMMMMMMMMMMMMM
MMMMMMMMMMNNmdhhyyssssooo++////////////:::////+oossssssyyyhyyhdmNMMMMMMMMMMMM
MMMMMMMMMMNNmdhyyysssyssso++/::::::::::--::://++ooooooooosyyhddmmMMMMMMMMMMMM
MMMMMMMMMNNNmdhhyyyyyssoo+++///::--:-----://++oooo++/////+osyhddmNMMMMMMMMMMM
MMMMMMMMNNNNdhhhyssooossoooo+++/::------:://+++++ooooooosssyhhdmmmNMMMMMMMMMM
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http://www.text-image.com/convert/ascii.html
shp sez moo.
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You put your WEED in there!
now how will you smoke it?
Want your text to appear up here? "nc -u 172.16.1.61 12121"
Want your text to appear up here? "nc -u 172.16.1.61 12121"
Save keystrokes: alias ncu='nc -u 172.16.1.61 12121'
                         /__                       /___    --Unknown




                                     _-~~~~-
                                    -   @  @
"I love you                        '         
 You love me                       |      .. |         |    /|
 We're one big                    ' `. '___/` .`.     | ,,/_/
 happy family                |_  /    `-____--//    __/ /    
 With a nick knack             /    .\     /  _--/     (D)  
 paddy wack                        .'  \     |   -/    (_      
 give the dog                   `.     /'     |   /       _ / ==
 a bone                   __------   |       .'_/         / _ O o)
 this old man            /        _|  /`-__-'/             /   ==/
 went rolling home      /        |                       /
 with a great big      ||         __/                 _/
 hug and a kiss        ||         /              _      /  |
 from me to you        | |      /--______      ___    /  :
 won't you say you     | /   __-  - _/   ------    |  |    
 love me too."          |   -  -   /                | |      )
                        |  |   -  |                 | )     | |
                         | |    | |                 | |    | |
                         | |    < |                 | |   |_/
                         < |    /__                 M  .MMMM**""
             ""**MMMMhx/.h/ .=*"
                      .3P"%....
                    nP"     "*MMnx                DaFreakyG
Want your text to appear up here? "nc -u 172.16.1.61 12121"
I want my text to appear up here
I need my text to appear up here
Plear appear up here
PLEEEEASE
Plear = Please + appear (i'm an idiot)
 |                                                |
 '-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-='
MY ASCII art didn't work :-(





      ___
     //  7
    (_,_/
         
          
      _    __
     (        )
      ______/

kids these days...
Meow
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    |    ||  /     eee------------_/        /               /      /
   _|_______|______________       || /          /|  | |    /      /
   _|_______|______________       || /          /|  | |    /      /
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|:   ===                -||:  )     `        e-__    __.-e     /'
 .____________________/_||../        `  /   /   eeee |        /'
                                        `-._     |  ||     _.-'
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Want your text to show up here? Type "rm -rf.... JK
                       ______
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                  /            
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  _     ) _________|IIIIII|__/__________________________
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        )_/                  /
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/______    /______    /______

         ______
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                           /     /   `.__/  | ||
                                /           | ||
                                            | ||
Want your text to appear up here? "nc -u 172.16.1.61 12121"
bye :)
Gotta bail in a few minutes...
Gonna post all this at http://jay.mcgavren.com
Will try and have something cooler at a future hacknight.
(Collaborative SVG, maybe?)
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