/
icmp_ping_tool.py
152 lines (122 loc) · 4.65 KB
/
icmp_ping_tool.py
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
# -*- coding: utf-8 -*-
# A simple icmp ping tools.
# Get more info http://www.s0nnet.com/archives/python-icmp
# by s0nnet.
import os
import argparse
import socket
import struct
import select
import time
ICMP_ECHO_REQUEST = 8 # Platform specific
DEFAULT_TIMEOUT = 2
DEFAULT_COUNT = 4
class Pinger(object):
""" Pings to a host -- the Pythonic way"""
def __init__(self, target_host, count=DEFAULT_COUNT, timeout=DEFAULT_TIMEOUT):
self.target_host = target_host
self.count = count
self.timeout = timeout
def do_checksum(self, source_string):
""" Verify the packet integritity """
sum = 0
max_count = (len(source_string)/2)*2
count = 0
while count < max_count:
val = ord(source_string[count + 1])*256 + ord(source_string[count])
sum = sum + val
sum = sum & 0xffffffff
count = count + 2
if max_count<len(source_string):
sum = sum + ord(source_string[len(source_string) - 1])
sum = sum & 0xffffffff
sum = (sum >> 16) + (sum & 0xffff)
sum = sum + (sum >> 16)
answer = ~sum
answer = answer & 0xffff
answer = answer >> 8 | (answer << 8 & 0xff00)
return answer
def receive_pong(self, sock, ID, timeout):
"""
Receive ping from the socket.
"""
time_remaining = timeout
while True:
start_time = time.time()
readable = select.select([sock], [], [], time_remaining)
time_spent = (time.time() - start_time)
if readable[0] == []: # Timeout
return
time_received = time.time()
recv_packet, addr = sock.recvfrom(1024)
icmp_header = recv_packet[20:28]
type, code, checksum, packet_ID, sequence = struct.unpack(
"bbHHh", icmp_header
)
if packet_ID == ID:
bytes_In_double = struct.calcsize("d")
time_sent = struct.unpack("d", recv_packet[28:28 + bytes_In_double])[0]
return time_received - time_sent
time_remaining = time_remaining - time_spent
if time_remaining <= 0:
return
def send_ping(self, sock, ID):
"""
Send ping to the target host
"""
target_addr = socket.gethostbyname(self.target_host)
my_checksum = 0
# Create a dummy heder with a 0 checksum.
header = struct.pack("bbHHh", ICMP_ECHO_REQUEST, 0, my_checksum, ID, 1)
bytes_In_double = struct.calcsize("d")
data = (192 - bytes_In_double) * "Q"
data = struct.pack("d", time.time()) + data
# Get the checksum on the data and the dummy header.
my_checksum = self.do_checksum(header + data)
header = struct.pack(
"bbHHh", ICMP_ECHO_REQUEST, 0, socket.htons(my_checksum), ID, 1
)
packet = header + data
sock.sendto(packet, (target_addr, 1))
def ping_once(self):
"""
Returns the delay (in seconds) or none on timeout.
"""
icmp = socket.getprotobyname("icmp")
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, icmp)
except socket.error, (errno, msg):
if errno == 1:
# Not superuser, so operation not permitted
msg += "ICMP messages can only be sent from root user processes"
raise socket.error(msg)
except Exception, e:
print "Exception: %s" %(e)
my_ID = os.getpid() & 0xFFFF
self.send_ping(sock, my_ID)
delay = self.receive_pong(sock, my_ID, self.timeout)
sock.close()
return delay
def ping(self):
"""
Run the ping process
"""
for i in xrange(self.count):
print "Ping to %s..." % self.target_host,
try:
delay = self.ping_once()
except socket.gaierror, e:
print "Ping failed. (socket error: '%s')" % e[1]
break
if delay == None:
print "Ping failed. (timeout within %ssec.)" % self.timeout
else:
delay = delay * 1000
print "Get pong in %0.4fms" % delay
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Python ping')
parser.add_argument('--target-host', action="store", dest="target_host", required=True)
given_args = parser.parse_args()
target_host = given_args.target_host
pinger = Pinger(target_host=target_host)
pinger.ping()