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A pure python ping implementation using raw socket.
#!/usr/bin/env python
"""
A pure python ping implementation using raw socket.
Note that ICMP messages can only be sent from processes running as root.
Derived from ping.c distributed in Linux's netkit. That code is
copyright (c) 1989 by The Regents of the University of California.
That code is in turn derived from code written by Mike Muuss of the
US Army Ballistic Research Laboratory in December, 1983 and
placed in the public domain. They have my thanks.
Bugs are naturally mine. I'd be glad to hear about them. There are
certainly word - size dependenceies here.
Copyright (c) Matthew Dixon Cowles, <http://www.visi.com/~mdc/>.
Distributable under the terms of the GNU General Public License
version 2. Provided with no warranties of any sort.
Original Version from Matthew Dixon Cowles:
-> ftp://ftp.visi.com/users/mdc/ping.py
Rewrite by Jens Diemer:
-> http://www.python-forum.de/post-69122.html#69122
Revision history
~~~~~~~~~~~~~~~~
May 30, 2007
little rewrite by Jens Diemer:
- change socket asterisk import to a normal import
- replace time.time() with time.clock()
- delete "return None" (or change to "return" only)
- in checksum() rename "str" to "source_string"
November 22, 1997
Initial hack. Doesn't do much, but rather than try to guess
what features I (or others) will want in the future, I've only
put in what I need now.
December 16, 1997
For some reason, the checksum bytes are in the wrong order when
this is run under Solaris 2.X for SPARC but it works right under
Linux x86. Since I don't know just what's wrong, I'll swap the
bytes always and then do an htons().
December 4, 2000
Changed the struct.pack() calls to pack the checksum and ID as
unsigned. My thanks to Jerome Poincheval for the fix.
Last commit info:
~~~~~~~~~~~~~~~~~
$LastChangedDate: $
$Rev: $
$Author: $
"""
import os, sys, socket, struct, select, time
# From /usr/include/linux/icmp.h; your milage may vary.
ICMP_ECHO_REQUEST = 8 # Seems to be the same on Solaris.
def checksum(source_string):
"""
I'm not too confident that this is right but testing seems
to suggest that it gives the same answers as in_cksum in ping.c
"""
sum = 0
countTo = (len(source_string)/2)*2
count = 0
while count<countTo:
thisVal = ord(source_string[count + 1])*256 + ord(source_string[count])
sum = sum + thisVal
sum = sum & 0xffffffff # Necessary?
count = count + 2
if countTo<len(source_string):
sum = sum + ord(source_string[len(source_string) - 1])
sum = sum & 0xffffffff # Necessary?
sum = (sum >> 16) + (sum & 0xffff)
sum = sum + (sum >> 16)
answer = ~sum
answer = answer & 0xffff
# Swap bytes. Bugger me if I know why.
answer = answer >> 8 | (answer << 8 & 0xff00)
return answer
def receive_one_ping(my_socket, ID, timeout):
"""
receive the ping from the socket.
"""
timeLeft = timeout
while True:
startedSelect = time.clock()
whatReady = select.select([my_socket], [], [], timeLeft)
howLongInSelect = (time.clock() - startedSelect)
if whatReady[0] == []: # Timeout
return
timeReceived = time.clock()
recPacket, addr = my_socket.recvfrom(1024)
icmpHeader = recPacket[20:28]
type, code, checksum, packetID, sequence = struct.unpack(
"bbHHh", icmpHeader
)
if packetID == ID:
bytesInDouble = struct.calcsize("d")
timeSent = struct.unpack("d", recPacket[28:28 + bytesInDouble])[0]
return timeReceived - timeSent
timeLeft = timeLeft - howLongInSelect
if timeLeft <= 0:
return
def send_one_ping(my_socket, dest_addr, ID):
"""
Send one ping to the given >dest_addr<.
"""
dest_addr = socket.gethostbyname(dest_addr)
# Header is type (8), code (8), checksum (16), id (16), sequence (16)
my_checksum = 0
# Make a dummy heder with a 0 checksum.
header = struct.pack("bbHHh", ICMP_ECHO_REQUEST, 0, my_checksum, ID, 1)
bytesInDouble = struct.calcsize("d")
data = (192 - bytesInDouble) * "Q"
data = struct.pack("d", time.clock()) + data
# Calculate the checksum on the data and the dummy header.
my_checksum = checksum(header + data)
# Now that we have the right checksum, we put that in. It's just easier
# to make up a new header than to stuff it into the dummy.
header = struct.pack(
"bbHHh", ICMP_ECHO_REQUEST, 0, socket.htons(my_checksum), ID, 1
)
packet = header + data
my_socket.sendto(packet, (dest_addr, 1)) # Don't know about the 1
def do_one(dest_addr, timeout):
"""
Returns either the delay (in seconds) or none on timeout.
"""
icmp = socket.getprotobyname("icmp")
try:
my_socket = socket.socket(socket.AF_INET, socket.SOCK_RAW, icmp)
except socket.error, (errno, msg):
if errno == 1:
# Operation not permitted
msg = msg + (
" - Note that ICMP messages can only be sent from processes"
" running as root."
)
raise socket.error(msg)
raise # raise the original error
my_ID = os.getpid() & 0xFFFF
send_one_ping(my_socket, dest_addr, my_ID)
delay = receive_one_ping(my_socket, my_ID, timeout)
my_socket.close()
return delay
def verbose_ping(dest_addr, timeout = 2, count = 4):
"""
Send >count< ping to >dest_addr< with the given >timeout< and display
the result.
"""
for i in xrange(count):
print "ping %s..." % dest_addr,
try:
delay = do_one(dest_addr, timeout)
except socket.gaierror, e:
print "failed. (socket error: '%s')" % e[1]
break
if delay == None:
print "failed. (timeout within %ssec.)" % timeout
else:
delay = delay * 1000
print "get ping in %0.4fms" % delay
print
if __name__ == '__main__':
verbose_ping("heise.de")
verbose_ping("google.com")
verbose_ping("a-test-url-taht-is-not-available.com")
verbose_ping("192.168.1.1")
@gopiballava
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gopiballava commented May 17, 2012

Whoops. Lines 160 and 248 should be %65535 not /65535.

@pklaus
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Author

pklaus commented May 17, 2012

Thanks, corrected. ;-)

@fly123
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fly123 commented Sep 25, 2012

good job, thanks.

@luizberti
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luizberti commented Oct 13, 2013

I've rewritten this script, removing unnecessary functions and variable declarations, also cleaned it up quite a lot, optimised the code and renamed some poorly named functions. It's here in case anyone is interested.

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ghost commented Oct 29, 2013

Tanács ellen az "kattints ide"

@kushalkadaba
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kushalkadaba commented Apr 20, 2014

I copied the checksum function and got the following error:
thisVal = ord(string[count+1]) * 256 + ord(string[count])
TypeError: ord() expected string of length 1, but int found

So i changed the code to: thisVal = ord(str(string[count+1])) * 256 + ord(str(string[count]))
Now I am getting an error TypeError: ord() expected a character, but string of length 2 found.

Did anybody face this?
PS: I am using Python 3 (Don't know how this would affect it unless ord has become stricter in type checking)

@soneedu
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soneedu commented Jun 17, 2014

how to use this script to ping 1500 bytes size ? this is useful to check the network

@trainman419
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trainman419 commented Aug 23, 2014

You have to swap the checksum bytes on line 124 because you're not packing and unpacking the packet in network byte order. This also causes the id and sequence numbers on the wire to be swapped.

@Aimage
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Aimage commented Aug 9, 2017

I see that if the socket is not ready the ping return None in line 183(function receive_ping) like if we have a timeout.
Normaly we must recheck if the socket is ready after that not return None.
But I've try to recheck by replacing the return with continue. The problem is that it produce an infinite loop, like the socket is never ready.
Why it is never ready? How to recheck it properly?
Anyone have better solution?

@yhojann-cl
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yhojann-cl commented Jun 30, 2019

What is self.set_socket()?

@incognitojam
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incognitojam commented Jan 15, 2020

203 gang

@Hell-Boy345
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Hell-Boy345 commented Feb 18, 2021

Wait, is this supposed to work only on Linux ?

@noobprogammier
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noobprogammier commented Jul 2, 2021

Who ever wants the fix, please contact me at my discord: Pentagon#0353

@kyxaxa
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kyxaxa commented Nov 4, 2021

How is it possible to check ping with the proxy?

@yhojann-cl
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yhojann-cl commented Nov 4, 2021

How is it possible to check ping with the proxy?

Proxies protocols does not support ICMP packet, only TCP. You need a VPN.

@tenaciouspete
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tenaciouspete commented Sep 30, 2022

I copied the checksum function and got the following error: thisVal = ord(string[count+1]) * 256 + ord(string[count]) TypeError: ord() expected string of length 1, but int found

So i changed the code to: thisVal = ord(str(string[count+1])) * 256 + ord(str(string[count])) Now I am getting an error TypeError: ord() expected a character, but string of length 2 found.

Did anybody face this? PS: I am using Python 3 (Don't know how this would affect it unless ord has become stricter in type checking)

I had this issue also, removing the "ord" keywords seems to work.

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