import os
import time
count = 0
string= ""
interfaces=[]
for dirname, dirnames, filenames in os.walk('/sys/class/net/'):
    iflist =  [(d,os.path.realpath(dirname+d)) for d in os.listdir(dirname) ]
    for (ifname, ifpath) in iflist:
        #avoid checking virtual interfaces
        if ifname != "lo" and 'virtual' not in ifpath:
	    #Here we are assigning an arbitrary IP which could be a different one. This is just to get the interface up
	    interfaces.append(ifname)
	    ip= 100+count
	    string += "auto " + ifname
	    string += "\niface " +  ifname +" inet static"
	    string += "\naddress 10.0.0." + str(ip)
	    if count == 0:
		string += "\ngateway 10.0.0.1"
	    string += "\nnetmask 255.255.255.0\n\n"
	    count=count+1


with open("/etc/network/interfaces", "w") as text_file:
    text_file.write(string)

for item in interfaces:
    os.system("sudo ifup "+ item)
    f= os.popen("sudo ethtool "+ item + " | grep -i \"Link detected\"")
    result = f.read()
    count = 0
    while result.find("yes") == -1:
        time.sleep(5)
        f= os.popen("sudo ethtool "+ item + " | grep -i \"Link detected\"" )
        result = f.read()
        count = count + 1
        print result
        if count > 20:
            break