def handle_read(self):
logging.root.debug("Handling Read")
finishtime = int(round(time.time() * 1000))
data, addr = self.sock.recvfrom(4096)
recvIP = IP.disassemble(data)
recvICMP = ICMPHeader.disassemble(recvIP.data)
retnIP = IP.disassemble(recvICMP.data)
if retnIP.ident in self.eventloop.probes:
self.eventloop.probes[retnIP.ident](recvICMP, retnIP.ident, finishtime)
def binary_search(self, icmp, ident, finishtime):
"""Binary Search takes raw packet data, and searches for the proper number
of hops to a particular router.
data = the raw ip packet
"""
if self.ident == ident:
if icmp.type == 3:
ip = IP.disassemble(icmp.data)
ttl = self.current_ttl - ip.ttl + 1
rtt = finishtime - self.starttime
log_str = '%s: HOPS=%d, RTT=%d' % (self.destaddr[0], ttl, rtt)
logging.root.info(log_str)
if self.output:
self.output.write('%s, %d, %d\n' % (self.destaddr[0], ttl, rtt))
self.handle_close()
elif icmp.type == 11:
logging.root.debug('TTL Estimate Too Low')
self.current_ttl = self.current_ttl*2
self.create_packet()
log_str = 'Changing TTL: %s' % self.current_ttl
logging.root.info(log_str)
else:
log_str = 'Unknown ICMP Type=%d, Code=%d' % (icmp.type, icmp.code)
logging.root.info(log_str)
self.current_ttl = self.current_ttl*2
self.create_packet()
log_str = 'Changing TTL: %s' % self.current_ttl
logging.root.info(log_str)
