def test_l2_recvfrom (self):
#addr = ''
#frame_queue = Queue.Queue()
#external_address_queue = Queue.Queue()
# To use receive from, we go like this:
# frame, external_address = LinkLayer.l2
node = Node.Node(1, 'localhost', 5555)
node.SetMTU(1500)
node.AddLink((2, 'localhost', 1))
node.AddLink((3, 'localhost', 1))
client_address, client_socket = LinkLayer.InitializeSocket(node)
#print(client_address, client_socket.getsockname())
some_frame = LinkLayer.Frame()
some_frame.SetPayload('This is a payload.')
#node.PrintContents()
#some_frame.PrintContents()
LinkLayer.l2_sendto(client_socket, 'localhost', some_frame, node)
#frame_queue.put(result)
#external_address_queue.put(addr)
#thread_id = thread.start_new_thread(LinkLayer.l2_recvfrom, (client_socket, node))
#frame = frame_queue.get()
#external_address = external_address_queue.get()
frame, external_address = LinkLayer.l2_recvfrom(client_socket, node)
frame.PrintContents()
#LinkLayer.l2_sendto(client_socket, 'localhost', some_frame, node)
client_socket.close()
pass
def test_l2_sendto (self):
node = Node.Node(1, 'localhost', 5556)
node.SetMTU(1500)
node.AddLink((2, 'localhost', 1))
node.AddLink((3, 'localhost', 1))
client_address, client_socket = LinkLayer.InitializeSocket(node)
some_frame = LinkLayer.Frame()
some_frame.SetPayload('This is a payload.')
LinkLayer.l2_sendto(client_socket, 'localhost', some_frame, node)
client_socket.close()
def test_l2_sendto (self):
# To use l2_sendto, we go like this:
# <will add this tomorrow, April 02, 2010>
node = Node.Node(1, 'localhost', 5556)
node.SetMTU(1500)
node.AddLink((2, 'localhost', 1))
node.AddLink((3, 'localhost', 1))
client_address, client_socket = LinkLayer.InitializeSocket(node)
some_frame = LinkLayer.Frame()
some_frame.SetPayload('This is a payload.')
LinkLayer.l2_sendto(client_socket, 'localhost', some_frame, node)
client_socket.close()
def l3_sendto(client_socket, destination_nid, destination_port, DVRP=None, segment=None, node=None):
"""
This function will be used in Layer 4, the Transport layer. Nowhere in this Layer 3
is this function used--rather, this layer purely uses l2_sendto from
the LinkLayer module.
"""
# next_hop = DVRP.GetRoutingTable()[destination_nid]
mtu = node.GetMTU()
sequence_number = 1
total_sequence_numbers = 1
dest_hostname = ResolveNID(destination_nid, node)
# dest_hostname = socket.gethostbyname(dest_hostname)
while len(segment) > mtu:
temp_segment = segment[: mtu - 1]
datagram = Datagram(
sequence_number,
total_sequence_numbers,
mtu,
10,
node.GetNID(),
node.GetPort(),
destination_nid,
destination_port,
temp_segment,
)
what_was_sent = LinkLayer.l2_sendto(client_socket, dest_hostname, datagram, node)
segment = segment[mtu:]
sequence_number += 1
total_sequence_numbers += 1
if len(segment) > 0:
datagram = Datagram(
sequence_number,
total_sequence_numbers,
mtu,
10,
node.GetNID(),
node.GetPort(),
destination_nid,
destination_port,
len(segment),
segment,
)
what_was_sent = LinkLayer.l2_sendto(client_socket, dest_hostname, datagram, node)
return datagram
def test_communications (self):
#node = Node.Node(1, 'localhost', 5555)
#node.SetMTU(1500)
#node.AddLink((2, 'localhost', 1))
#node.AddLink((3, 'localhost', 1))
node = Node.ConfigInitialNetworkTopology(sys.argv[3], int(sys.argv[1]))
client_address, client_socket = LinkLayer.InitializeSocket(node)
datagram = NetworkLayer.Datagram()
datagram.SetMTU(node.GetMTU())
itc_script = open('itc_test.txt')
a_list = itc_script.readlines()
itc_script.close()
for entry in a_list:
temp = entry.split(' ')
if sys.argv[1] == temp[0]:
datagram.SetSourcePort(int(temp[2]))
if sys.argv[2] in temp[0]:
datagram.SetDestPort(int(temp[2]))
# YOU MUST PUT THE \r\n IN HERE OR IT WILL NOT WORK.
#datagram.SetPayload('This is a payload.\r\n')
inputs = [client_socket, sys.stdin]
#print(what_was_sent.PrintContents())
go=1
while(go is 1):
#sys.stdout.write(str(node.GetNID()) + '> ')
inputready,outputready,exceptready = select.select(inputs,[],[])
for s in inputready:
if s == client_socket:
length_of_buffer, received_frame, datagram_to_pass, external_address, received_segment = LinkLayer.l2_recvfrom(client_socket, node) # added node as a parameter 04-06-2010.
print(datagram_to_pass.GetPayload())
# received_segment.PrintContents()
elif s == sys.stdin:
payload = list(sys.stdin.readline())
payload.remove('\n')
payload.append('\r')
payload.append('\n')
payload = ''.join(payload)
if 'exit' in payload:
print('exiting...')
go=0
datagram.SetPayload(payload)
hn = NetworkLayer.ResolveNID(int(sys.argv[2]), node)
what_was_sent = LinkLayer.l2_sendto(client_socket, hn, datagram, node)
#print(length_of_buffer)
#received_frame.PrintContents()
#if received_frame.GetLength() > 0:
# pass # We need to deal with Layer 3 send here.
#datagram_to_pass.PrintContents()
#print(external_address)
client_socket.close()
def test_communications (self): #node = Node.Node(1, 'localhost', 5555) node = Node.Node(1, 'localhost', 5555, [(2, 'localhost', 1), (3, 'u-03.ecc.unr.edu', 1)], 1500, 0) routing_table = RoutingProtocol.DVRP(node) # YOU NEED THE \r\n IN HERE. segment = 'This is a payload.\r\n' #node.SetMTU(1500) #node.AddLink((1, 'localhost', 1)) # A link to itself... #node.AddLink((2, 'localhost', 1)) #node.AddLink((3, 'localhost', 1)) client_address, client_socket = LinkLayer.InitializeSocket(node) what_was_sent = TransportLayer.l4_sendto(client_socket, 2, 5555, routing_table, segment, node) #print(what_was_sent) # Receive it. length_of_buffer, received_frame, datagram_to_pass, external_address, received_segment = \ LinkLayer.l2_recvfrom(client_socket, node) print(received_segment)
def test_communications (self): node = Node.Node(1, 'localhost', 5555) routing_table = RoutingProtocol.DVRP(node) # YOU NEED THE \r\n IN HERE. segment = 'This is a payload.\r\n' node.SetMTU(1500) node.AddLink((1, 'localhost', 1)) # A link to itself... node.AddLink((2, 'localhost', 1)) node.AddLink((3, 'localhost', 1)) client_address, client_socket = LinkLayer.InitializeSocket(node) what_was_sent = NetworkLayer.l3_sendto(client_socket, 2, 5555, routing_table, segment, node) #print(what_was_sent) # Receive it. length_of_buffer, received_frame, datagram_to_pass, external_address, received_segment = \ LinkLayer.l2_recvfrom(client_socket, node) print(received_segment) received_segment.PrintContents()
if forwarding_ip != WAN_ip:
dst_ip = forwarding_ip
else:
dst_ip = network.dst_ip
if dst_ip != forwarding_ip:
print('forwaring to', forwarding_table[network.dst_ip])
dst_mac = util.ip2mac(dst_ip)
linklayer.sendto(dst_mac, frame)
elif (network.dst_ip, transport.dst_port) in NAT_in :
network.dst_ip, transport.dst_port = NAT_in[(network.dst_ip, transport.dst_port)]
frame = pack(network, transport)
IP.push(frame)
else:
ICMP.host_unreachable(WAN_ip, network.src_ip)
linklayer = LinkLayer(callback)
# def is_reachable_host(dst_ip):
# '''
# Private method for check if the current dst_ip is legal
# :param dst_ip: dst_ip
# :return: boolean
# '''
# ip_list = [util.get_local_ipv4_address()]
# for ele in NAT_in.keys():
# ip_list.append(ele[0])
# if dst_ip not in forwarding_table.values() or ip_list:
# return False
# return True
