def tryInterfaces(self, ifaces):
try:
from scapy.all import sr1 ## we want this check to be blocking
except:
log.msg("This test requires scapy: www.secdev.org/projects/scapy")
raise SystemExit
ifup = {}
while ifaces:
for ifname, ifaddr in ifaces:
log.debug("Currently testing network capabilities of interface"
+ "%s by sending a packet to our address %s"
% (ifname, ifaddr))
try:
pkt = IP(dst=ifaddr)/ICMP()
ans, unans = sr(pkt, iface=ifname, timeout=self.timeout)
except Exception, e:
raise PermissionsError if e.find("Errno 1") else log.err(e)
else:
## xxx i think this logic might be wrong
log.debug("Interface test packet\n%s\n\n%s"
% (pkt.summary(), pkt.show2()))
if ans.summary():
log.info("Received answer for test packet on interface"
+"%s :\n%s" % (ifname, ans.summary()))
ifup.update(ifname, ifaddr)
else:
log.info("Our interface test packet was unanswered:\n%s"
% unans.summary())
def setUp(self, *a, **kw):
'''
:ivar ifaces:
Struct returned from getifaddrs(3) and turned into a tuple in the
form (*ifa_name, AF_FAMILY, *ifa_addr)
'''
if self.localOptions:
log.debug("%s: local_options found" % self.name)
for key, value in self.localOptions.items():
log.debug("setting self.%s = %s" % (key, value))
setattr(self, key, value)
## xxx is this now .subOptions?
#self.inputFile = self.localOptions['file']
self.timeout *= 1000 ## convert to milliseconds
if not self.interface:
log.msg("No network interface specified!")
log.debug("OS detected: %s" % sys.platform)
if LINUX or OPENBSD or NETBSD or FREEBSD or DARWIN or SOLARIS:
from twisted.internet.test import _posixifaces
log.msg("Attempting to discover network interfaces...")
ifaces = _posixifaces._interfaces()
elif WINDOWS:
from twisted.internet.test import _win32ifaces
log.msg("Attempting to discover network interfaces...")
ifaces = _win32ifaces._interfaces()
else:
log.debug("Client OS %s not accounted for!" % sys.platform)
log.debug("Unable to discover network interfaces...")
ifaces = [('lo', '')]
## found = {'eth0': '1.1.1.1'}
found = [{i[0]: i[2]} for i in ifaces if i[0] != 'lo']
log.info("Found interfaces:\n%s" % pprint(found))
self.interfaces = self.tryInterfaces(found)
else:
## xxx need a way to check that iface exists, is up, and
## we have permissions on it
log.debug("Our interface has been set to %s" % self.interface)
if self.pcap:
try:
self.pcapfile = open(self.pcap, 'a+')
except:
log.msg("Unable to write to pcap file %s" % self.pcap)
self.pcapfile = None
try:
assert os.path.isfile(self.file)
fp = open(self.file, 'r')
except Exception, e:
hosts = ['8.8.8.8', '38.229.72.14']
log.err(e)
