#!/usr/bin/env python
"""
Tells whether the internet is available using the SystemConfiguration
framework.

Usage:
    python internetison [address]
"""
from SystemConfiguration import *
import socket, sys

def resultAvailable(target, flags, info):
    print "got network reachability status for %s:"%(info,)

    if flags & kSCNetworkFlagsTransientConnection:
        print "- transient connection"

    if flags &  kSCNetworkFlagsReachable:
        print "- reachable"

    if flags &  kSCNetworkFlagsConnectionRequired:
        print "- connection required"

    if flags &  kSCNetworkFlagsConnectionAutomatic:
        print "- connection automatic"

    if flags &  kSCNetworkFlagsInterventionRequired:
        print "- user intervention required"

    if flags &  kSCNetworkFlagsIsLocalAddress:
        print "- local interface"

    if flags &  kSCNetworkFlagsIsDirect:
        print "- directly attached network"


    # And stop the program:
    loop = CFRunLoopGetCurrent()
    CFRunLoopStop(loop)


def main():
    if len(sys.argv) >= 2:
        addr = socket.gethostbyname(sys.argv[1])
    else:
        addr = '82.94.237.218' # www.python.org

    loop = CFRunLoopGetCurrent()
    
    target = SCNetworkReachabilityCreateWithAddress(None, (addr, 80))
    SCNetworkReachabilitySetCallback(target, resultAvailable, addr)

    ok, flags = SCNetworkReachabilityGetFlags(target, None)
    if ok:
        resultAvailable(target, flags, addr)

    else:
        ok = SCNetworkReachabilityScheduleWithRunLoop(target, 
                loop, kCFRunLoopCommonModes)

        CFRunLoopRun()

if __name__ == "__main__":
    main()