1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
#!/usr/bin/env python3
import socket
import sys
import time
import argparse
# action can be reflect or drop
action = "drop"
test = 0
def test_data(data, n_rcvd):
n_read = len(data)
for i in range(n_read):
expected = (n_rcvd + i) & 0xFF
byte_got = ord(data[i])
if byte_got != expected:
print(
"Difference at byte {}. Expected {} got {}".format(
n_rcvd + i, expected, byte_got
)
)
return n_read
def handle_connection(connection, client_address):
print("Received connection from {}".format(repr(client_address)))
n_rcvd = 0
try:
while True:
data = connection.recv(4096)
if not data:
break
if test == 1:
n_rcvd += test_data(data, n_rcvd)
if action != "drop":
connection.sendall(data)
finally:
connection.close()
def run_tcp_server(ip, port):
print("Starting TCP server {}:{}".format(repr(ip), repr(port)))
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_address = (ip, int(port))
sock.bind(server_address)
sock.listen(1)
while True:
connection, client_address = sock.accept()
handle_connection(connection, client_address)
def run_udp_server(ip, port):
print("Starting UDP server {}:{}".format(repr(ip), repr(port)))
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_address = (ip, int(port))
sock.bind(server_address)
while True:
data, addr = sock.recvfrom(4096)
if action != "drop":
# snd_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.sendto(data, addr)
def run_server(ip, port, proto):
if proto == "tcp":
run_tcp_server(ip, port)
elif proto == "udp":
run_udp_server(ip, port)
def prepare_data(power):
buf = []
for i in range(0, pow(2, power)):
buf.append(i & 0xFF)
return bytearray(buf)
def run_tcp_client(ip, port):
print("Starting TCP client {}:{}".format(repr(ip), repr(port)))
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_address = (ip, int(port))
sock.connect(server_address)
data = prepare_data(16)
n_rcvd = 0
n_sent = len(data)
try:
sock.sendall(data)
timeout = time.time() + 2
while n_rcvd < n_sent and time.time() < timeout:
tmp = sock.recv(1500)
tmp = bytearray(tmp)
n_read = len(tmp)
for i in range(n_read):
if data[n_rcvd + i] != tmp[i]:
print(
"Difference at byte {}. Sent {} got {}".format(
n_rcvd + i, data[n_rcvd + i], tmp[i]
)
)
n_rcvd += n_read
if n_rcvd < n_sent or n_rcvd > n_sent:
print("Sent {} and got back {}".format(n_sent, n_rcvd))
else:
print("Got back what we've sent!!")
finally:
sock.close()
def run_udp_client(ip, port):
print("Starting UDP client {}:{}".format(repr(ip), repr(port)))
n_packets = 100
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server_address = (ip, int(port))
data = prepare_data(10)
try:
for i in range(0, n_packets):
sock.sendto(data, server_address)
finally:
sock.close()
def run_client(ip, port, proto):
if proto == "tcp":
run_tcp_client(ip, port)
elif proto == "udp":
run_udp_client(ip, port)
def run(mode, ip, port, proto):
if mode == "server":
run_server(ip, port, proto)
elif mode == "client":
run_client(ip, port, proto)
else:
raise Exception("Unknown mode. Only client and server supported")
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("-m", action="store", dest="mode")
parser.add_argument("-i", action="store", dest="ip")
parser.add_argument("-p", action="store", dest="port")
parser.add_argument("-proto", action="store", dest="proto")
parser.add_argument("-a", action="store", dest="action")
parser.add_argument("-t", action="store", dest="test")
results = parser.parse_args()
action = results.action
test = results.test
run(results.mode, results.ip, results.port, results.proto)
# if (len(sys.argv)) < 4:
# raise Exception("Usage: ./dummy_app <mode> <ip> <port> [<action> <test>]")
# if (len(sys.argv) == 6):
# action = sys.argv[4]
# test = int(sys.argv[5])
# run (sys.argv[1], sys.argv[2], int(sys.argv[3]))
|
