hi,
our names are Guillermo Spiller and Martin Irazoqui, we are working in
Uruguay with the OLPC proyect. In a few days we are going to start a
pilot in a school wishing to spread the internet all over the town. In
order to accomplish this we needed to make the mpp configuration
automatically (making each portal "intelligent" so it will be awared of
the network changes).As for now the ip is given by a DHCP server, we
configured some XO as dhcp servers (in differents ranges) so the ips
won't collide. We also stopped the dhcp in every "normal" computer. We
think that this script might help and it would be nice to receive some
comments about it. We did a script (attached) so every minute the XO
will check its status (am I a portal or not?), if it's a portal it will
reconfirm its connectivity with the AP and if it's still good will
sleep for an extra minute. If it's not, it will stop of being a portal.
In case of not being a portal, and having a gateway in eth0, after
checking the connectivity with this gateway will start the mpp
services. If you want to see this with more details you can always read
the script, we tried to comment it as well as possible.
This script saves the status of the computer in the file
/var/log/portal and explain his behaviour.
It would be better if this "thinking" would be done in the network
manager, so when a kid clicks in the circle you know that you have to
stop the mpp, and if he clicks in the triangle you might be a portal.
We tried to do this but we didn?t find the code of this buttons.
We also would like to know if there is a table where the computers
write the possible dhcp servers, or portals because when we try to
connect an XO as a client for the first time we have to click in the
circle several times, but if we want to re-connect it?s very easy..
#! /usr/bin/python
#
import os, sys, time
archivo = file('/var/log/portal','w') # File where every message is gonig to be
saved
archivo.write('')
archivo.close()
archivo = file('/var/log/portal','a')
def autoportal():
portal=0
contador = 5
i = 1
archivo.write(str(time.localtime())+'Starting...'+"\n")
archivo.flush()
while (i == 1):
if (contador >= 10): # scanning every ten minutes
os.popen("iwlist eth0 scan")
archivo.write(str(time.localtime())+'Scanning
interfaces, refreshing UI \n')
archivo.flush()
contador = 0
contador = contador + 1
archivo.write(str(time.localtime())+"Am I a Portal? \n")
archivo.flush()
if (portal == 0):
archivo.write(str(time.localtime())+"No, I´m not \n")
archivo.flush()
info=os.popen("route | grep eth0 | grep default")
temp=info.readline().split()
if (len(temp) != 0): #Im not a MPP but I have a gw in
eth0
ip=temp[1]
check=os.popen("ping -c 5 "+str(ip)) # Checking
if gw answers...
os.popen("sleep 5")
check.readline()
temp = check.readline().split()
if (len(temp) != 0):
temp=temp[0]
if (temp != "From"): # gw answered.
# We should check if the AP has
Internet
TengoIpMesh()
info = os.popen("ifconfig msh0")
info.readline()
temp =
info.readline().split()[1]
if (temp != "addr:"): # I´m in
the mesh?
os.popen("service mpp
start") # yes
archivo.write(str(time.localtime())+"Starting MPP \n")
archivo.flush()
portal = 1
else: # no
archivo.write(str(time.localtime())+"DHCP didn´t give me an IP \n")
archivo.flush()
else:
os.popen("service mpp stop")
archivo.write(str(time.localtime())+"stopping MPP, I can´t reach the AP. \n")
archivo.flush()
else:
os.popen("service mpp stop")
archivo.write(str(time.localtime())+"Stoppiing MPP, AP didn´t respond. \n")
archivo.flush()
else: # I don´t have a default gw in eth0
archivo.write(str(time.localtime())+"Am I a
client? \n")
archivo.flush()
info=os.popen("route | grep msh0 | grep
default")
temp=info.readline().split()
if (len(temp) != 0):
archivo.write(str(time.localtime())+"Yes, yupi! \n")
archivo.flush()
else:
archivo.write(str(time.localtime())+"I´m not a portal or client, pff \n")
archivo.flush()
else: # I´m already a portal, checking my connection
TengoIpMesh() # Just checking
contador = contador + 1
info=os.popen("route | grep eth0 | grep default") #
Looking for my default route
temp=info.readline().split()
if (len(temp) != 0):
ip=temp[1] # IP of my default route
check=os.popen("ping -c 5 "+str(ip)) #
...pinging...
os.popen("sleep 5")
check.readline()
temp=check.readline().split()
if (len(temp) != 0):
temp=temp[0]
if (temp == "From"): # I lost my
connection
os.popen("service mpp stop") #
:(
portal = 0
archivo.write(str(time.localtime())+"Stopping MPP, I can´t reach my AP \n")
archivo.flush()
else:
os.popen("service mpp start")
archivo.write(str(time.localtime())+"I'm a MPP \n")
archivo.flush()
os.popen("sleep 60") # Waiting
an extra minute
contador = contador + 1
else:
os.popen("service mpp stop")
portal = 0
archivo.write(str(time.localtime())+"Sopping MPP, AP didn´t responde \n")
archivo.flush()
else:
# Just for checking, special case. We shouldn´t
be here
archivo.write(str(time.localtime())+"Stopping
MPP, special case \n")
archivo.flush()
os.popen("service mpp stop") # :(
portal = 0
os.popen("sleep 60") # waitting for a minute
def TengoIpMesh(): #configurating Mesh
info = os.popen("ifconfig msh0")
info.readline()
temp = info.readline().split()[1]
if (temp == "addr:"): # Is not already configurated
os.popen("dhclient msh0") # getting an IP
os.popen("killall dhclient")
os.popen("iwlist eth0 scan") # scanning, circle sometimes kills
eth0
archivo.write(str(time.localtime())+"Refreshing graphic
interface \n")
archivo.flush()
contador = 0
autoportal()
# Yoruguas
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