Re: [Tutor] python sockets
Ok, so after making the changes the code does bind the startingPort variable but that is the only port that gets bound. Also when connecting to the startingPort I receive the following error: Please enter starting port: 65520 listening... ...connected! Traceback (most recent call last): File response.py, line 31, in module thread.start_new_thread(setup(port)) TypeError: start_new_thread expected at least 2 arguments, got 1 On Tue, Jun 10, 2014 at 4:23 PM, Marc Tompkins marc.tompk...@gmail.com wrote: On Tue, Jun 10, 2014 at 9:28 AM, Jon Engle jon.en...@gmail.com wrote: for port in range (startingPort, 65535): thread.start_new_thread(setup, (port,)) startingPort=startingPort+1 #print startingPort I think you just need this: for port in range (startingPort, 65535): thread.start_new_thread(setup(port)) #print port and inside of setup, get rid of this line: PORT = startingPort#arbitrary port not currently in use -- Cheers, Jon S. Engle jon.en...@gmail.com ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python sockets
Ok, so when I run the code it immediately terminates and never 'listens' to
the ports in the loop. I have verified by running netstat -an | grep 65530
and the startingPort is not binding.
***Server***
Jons-Mac:Desktop Jon$ python response.py
Please enter starting port: 65530
Jons-Mac:Desktop Jon$
Jons-Mac:Desktop Jon$ netstat -an | grep 65530
Jons-MacDesktop Jon$
***Code***
#!/usr/bin/python # This is server.py file
from socket import * #import the socket library
import thread #import the thread library
startingPort=input(\nPlease enter starting port: )
startingPort=int(startingPort)
def setup(PORT):
##let's set up some constants
HOST = ''#we are the host
#PORT = startingPort#arbitrary port not currently in use
ADDR = (HOST,PORT)#we need a tuple for the address
BUFSIZE = 4096#reasonably sized buffer for data
## now we create a new socket object (serv)
## see the python docs for more information on the socket types/flags
serv = socket( AF_INET,SOCK_STREAM)
##bind our socket to the address
serv.bind((ADDR))#the double parens are to create a tuple with one
element
serv.listen(5)#5 is the maximum number of queued connections we'll allow
print 'listening...'
conn,addr = serv.accept() #accept the connection
print '...connected!'
conn.send('TEST')
conn.close()
for port in range (startingPort, 65535):
thread.start_new_thread(setup, (port,))
startingPort=startingPort+1
#print startingPort
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Re: [Tutor] python sockets
On 11/06/14 00:08, Jon Engle wrote: Ok, so when I run the code it immediately terminates and never 'listens' This has nothing to do with your immediate problem but... ***Code*** #!/usr/bin/python # This is server.py file from socket import * #import the socket library import thread#import the thread library startingPort=input(\nPlease enter starting port: ) startingPort=int(startingPort) You said you were using Python 2.7. Do not use input() in Python v2 use raw_input() instead. Especially since you are using int() to convert the data anyway. v2 input() evaluates whatever the user types which could be damaging code (whether deliberate or inadvertent). v2 input() is so dangerous it was removed from v3 and raw_input renamed as input. (Which has just created lots of confusion IMHO!) def setup(PORT): ##let's set up some constants HOST = ''#we are the host BTW I'm still losing nearly all indentation on your posts. Are you posting in plain text? Nobody else is complaining so it might just be my reader that's barfing on it... -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.flickr.com/photos/alangauldphotos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python sockets
On Tue, Jun 10, 2014 at 4:08 PM, Jon Engle jon.en...@gmail.com wrote:
Ok, so when I run the code it immediately terminates and never 'listens' to
the ports in the loop. I have verified by running netstat -an | grep 65530
and the startingPort is not binding.
The problem is that all threads started by a program terminate when
the program terminates - and you haven't told your program to stick
around when it's done setting up.So it's setting up and then
immediately exiting - and by the time you run netstat a few seconds
later you find nothing. (Also, by leaving HOST = '', you're listening
at address 0.0.0.0, so good luck catching any traffic...)
Try something like this:
#!/usr/bin/python # This is server.py file
from socket import * #import the socket library
import thread #import the thread library
def setup(PORT):
HOST = '127.0.0.1'#we are the host
ADDR = (HOST,PORT)#we need a tuple for the address
BUFSIZE = 4096#reasonably sized buffer for data
serv = socket( AF_INET,SOCK_STREAM)
serv.bind((ADDR))#the double parens are to create a tuple with
one element
serv.listen(5)#5 is the maximum number of queued connections we'll allow
print '\nlistening on port %i...' % PORT
conn,addr = serv.accept() #accept the connection
print '\n...port %i connected!' % PORT
conn.send('TEST')
conn.close()
def main():
startingPort=int(raw_input(\nPlease enter starting port: ))
for port in range (startingPort, 65535):
thread.start_new_thread(setup, (port,))
quitNow = ''
while quitNow not in ('Q', 'q'):
quitNow = raw_input('Enter Q to quit.')
if __name__ == '__main__':
main()
This will stick around until you enter 'Q', and if you run netstat in
another window you'll see that it's LISTENING on all the ports you
asked for. (All of those print statements will show up in a
surprising order!)
I'm not running the other side of this experiment, so I haven't tested
a successful connection... good luck.
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Re: [Tutor] python sockets
Jon Engle wrote:
Ok, so when I run the code it immediately terminates and never 'listens'
to the ports in the loop. I have verified by running netstat -an | grep
65530 and the startingPort is not binding.
As I've already hinted the easiest way to keep your listening threads alive
is to use the threading instead of the thread module:
$ cat bind_ports.py
#!/usr/bin/python
import socket
import threading
import sys
HOST = ''
STARTPORT = int(sys.argv[1])
ENDPORT = int(sys.argv[2])
def setup(port):
print 'setting up port', port
addr = (HOST, port)
serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
serv.bind(addr)
serv.listen(1)
conn, addr = serv.accept()
print 'port', port, '...connected!'
conn.sendall('TEST')
conn.close()
print 'port', port, '...CLOSED!'
if __name__ == __main__:
for port in range(STARTPORT, ENDPORT):
threading.Thread(target=setup, args=(port,)).start()
$ python bind_ports.py 0 3
[1] 9214
$ setting up port 0
setting up port 1
setting up port 2
netstat -an | grep
tcp0 0 0.0.0.0:0 0.0.0.0:* LISTEN
tcp0 0 0.0.0.0:1 0.0.0.0:* LISTEN
tcp0 0 0.0.0.0:2 0.0.0.0:* LISTEN
To test it I've applied a minor modification to the client of the echoserver
example in https://docs.python.org/2/library/socket.html#example
$ cat read_socket.py
import socket
import sys
HOST = 'localhost'
PORT = int(sys.argv[1])
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
s.sendall('Hello, world')
data = s.recv(1024)
s.close()
print 'Received', repr(data)
$ python read_socket.py 0
port 0 ...connected!
port 0 ...CLOSED!
Received 'TEST'
$ python read_socket.py 2
port 2 ...connected!
port 2 ...CLOSED!
Received 'TEST'
$ python read_socket.py 1
port 1 ...connected!
port 1 ...CLOSED!
Received 'TEST'
$ fg
bash: fg: Programm ist beendet.
[1]+ Fertig python bind_ports.py 0 3
$
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Re: [Tutor] python sockets
Alan Gauld wrote: On 11/06/14 00:08, Jon Engle wrote: Ok, so when I run the code it immediately terminates and never 'listens' This has nothing to do with your immediate problem but... ***Code*** #!/usr/bin/python # This is server.py file from socket import * #import the socket library import thread#import the thread library startingPort=input(\nPlease enter starting port: ) startingPort=int(startingPort) You said you were using Python 2.7. Do not use input() in Python v2 use raw_input() instead. Especially since you are using int() to convert the data anyway. v2 input() evaluates whatever the user types which could be damaging code (whether deliberate or inadvertent). v2 input() is so dangerous it was removed from v3 and raw_input renamed as input. (Which has just created lots of confusion IMHO!) def setup(PORT): ##let's set up some constants HOST = ''#we are the host BTW I'm still losing nearly all indentation on your posts. Are you posting in plain text? Nobody else is complaining so it might just be my reader that's barfing on it... No, it's not just you, I don't see any indentation either. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python sockets
Thank you for your help, this definitely gets me going in the right
direction!
On Wed, Jun 11, 2014 at 4:16 AM, Marc Tompkins marc.tompk...@gmail.com
wrote:
On Tue, Jun 10, 2014 at 4:08 PM, Jon Engle jon.en...@gmail.com wrote:
Ok, so when I run the code it immediately terminates and never 'listens'
to
the ports in the loop. I have verified by running netstat -an | grep
65530
and the startingPort is not binding.
The problem is that all threads started by a program terminate when
the program terminates - and you haven't told your program to stick
around when it's done setting up.So it's setting up and then
immediately exiting - and by the time you run netstat a few seconds
later you find nothing. (Also, by leaving HOST = '', you're listening
at address 0.0.0.0, so good luck catching any traffic...)
Try something like this:
#!/usr/bin/python # This is server.py file
from socket import * #import the socket library
import thread #import the thread library
def setup(PORT):
HOST = '127.0.0.1'#we are the host
ADDR = (HOST,PORT)#we need a tuple for the address
BUFSIZE = 4096#reasonably sized buffer for data
serv = socket( AF_INET,SOCK_STREAM)
serv.bind((ADDR))#the double parens are to create a tuple with
one element
serv.listen(5)#5 is the maximum number of queued connections we'll
allow
print '\nlistening on port %i...' % PORT
conn,addr = serv.accept() #accept the connection
print '\n...port %i connected!' % PORT
conn.send('TEST')
conn.close()
def main():
startingPort=int(raw_input(\nPlease enter starting port: ))
for port in range (startingPort, 65535):
thread.start_new_thread(setup, (port,))
quitNow = ''
while quitNow not in ('Q', 'q'):
quitNow = raw_input('Enter Q to quit.')
if __name__ == '__main__':
main()
This will stick around until you enter 'Q', and if you run netstat in
another window you'll see that it's LISTENING on all the ports you
asked for. (All of those print statements will show up in a
surprising order!)
I'm not running the other side of this experiment, so I haven't tested
a successful connection... good luck.
--
Cheers,
Jon S. Engle
jon.en...@gmail.com
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[Tutor] python sockets
I am trying to open ports 1025-65535 with the following code (Mostly found
online with small modifications). I am unable to bind anything other than
the one port which is selected as input. What am I missing and how do I
bind all the ports simultaneously?
#!/usr/bin/python # This is server.py file
from socket import * #import the socket library
import thread #import the thread library
startingPort=input(\nPlease enter starting port: )
startingPort=int(startingPort)
def setup():
##let's set up some constants
HOST = ''#we are the host
PORT = startingPort#arbitrary port not currently in use
ADDR = (HOST,PORT)#we need a tuple for the address
BUFSIZE = 4096#reasonably sized buffer for data
## now we create a new socket object (serv)
## see the python docs for more information on the socket types/flags
serv = socket( AF_INET,SOCK_STREAM)
##bind our socket to the address
serv.bind((ADDR))#the double parens are to create a tuple with one
element
serv.listen(5)#5 is the maximum number of queued connections we'll allow
serv = socket( AF_INET,SOCK_STREAM)
##bind our socket to the address
serv.bind((ADDR))#the double parens are to create a tuple with one
element
serv.listen(5)#5 is the maximum number of queued connections we'll allow
print 'listening...'
PORT=PORT+1
conn,addr = serv.accept() #accept the connection
print '...connected!'
conn.send('TEST')
conn.close()
while startingPort65535:
thread.start_new_thread(setup())
startingPort=startingPort+1
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Re: [Tutor] python sockets
Hi,
fist - are you really triyng to have open 64 000 ports? ok, i suppose
you have your reasons, but this is not a good idea - you'll block most
applications that use these ports ..
The problem is with your main function -
you have PORT defined, but it is not global, it is only local, and when
you add +1 to it, next spawned process will have PORT with previous value.
either use global PORT, or have it as a parameter for the function:
main(port):
..
PORT = port
while startingPort65535:
thread.start_new_thread(setup(startingPort))
startingPort=startingPort+1
Lukas
On 06/10/2014 01:33 AM, Jon Engle wrote:
I am trying to open ports 1025-65535 with the following code (Mostly
found online with small modifications). I am unable to bind anything
other than the one port which is selected as input. What am I missing
and how do I bind all the ports simultaneously?
#!/usr/bin/python # This is server.py file
from socket import * #import the socket library
import thread #import the thread library
startingPort=input(\nPlease enter starting port: )
startingPort=int(startingPort)
def setup():
##let's set up some constants
HOST = ''#we are the host
PORT = startingPort#arbitrary port not currently in use
ADDR = (HOST,PORT)#we need a tuple for the address
BUFSIZE = 4096#reasonably sized buffer for data
## now we create a new socket object (serv)
## see the python docs for more information on the socket types/flags
serv = socket( AF_INET,SOCK_STREAM)
##bind our socket to the address
serv.bind((ADDR))#the double parens are to create a tuple with one
element
serv.listen(5)#5 is the maximum number of queued connections we'll
allow
serv = socket( AF_INET,SOCK_STREAM)
##bind our socket to the address
serv.bind((ADDR))#the double parens are to create a tuple with one
element
serv.listen(5)#5 is the maximum number of queued connections we'll
allow
print 'listening...'
PORT=PORT+1
conn,addr = serv.accept() #accept the connection
print '...connected!'
conn.send('TEST')
conn.close()
while startingPort65535:
thread.start_new_thread(setup())
startingPort=startingPort+1
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Re: [Tutor] python sockets
On 10/06/14 00:33, Jon Engle wrote:
I am trying to open ports 1025-65535 with the following code
Why would you want to do that?
It sounds like a great way to cripple your PC as it runs 64000 threads
monitoring each of those ports. And it assumes that nothing else is
using those ports already... And if you did find something trying to
connect, what port is the server going to allocate? You've already
grabbed them all?
Can you explain your rationale for trying to do this? Unless you are
trying a brute force technique to prevent anything from connecting to
your computer?
found online with small modifications). I am unable to bind anything
other than the one port which is selected as input. What am I missing
and how do I bind all the ports simultaneously?
I think you are missing the basic concepts of server computing. You
should never need to bind all the ports at once.
However as to your code... its hard to critique because you lost the
indentation - presumably through posting in HTML? Try using plain text
for posting code.
#!/usr/bin/python # This is server.py file
from socket import * #import the socket library
import thread #import the thread library
startingPort=input(\nPlease enter starting port: )
startingPort=int(startingPort)
def setup():
...
## now we create a new socket object (serv)
## see the python docs for more information on the socket types/flags
serv = socket( AF_INET,SOCK_STREAM)
serv.bind((ADDR))
serv.listen(5)#5 is the maximum number of queued connections we'll allow
serv = socket( AF_INET,SOCK_STREAM)
serv.bind((ADDR))
serv.listen(5)#5 is the maximum number of queued connections we'll allow
Why do you do it twice?
print 'listening...'
Is this Python 2 or 3? Your input lines above suggest its Python 3 but
this print line suggests its Python 2. Which are you using?
PORT=PORT+1
conn,addr = serv.accept() #accept the connection
print '...connected!'
conn.send('TEST')
conn.close()
You normally put the listening code inside a loop, waiting for a
connection, processing it and then going back to listen some more
while startingPort65535:
thread.start_new_thread(setup())
startingPort=startingPort+1
Minor niggle, if you must do this use a for loop. Its tidier.
As a minimum you need some error handling to deal with
unsuccessful attempts to bind. And you need a better way
of processing connections.
But fundamentally, I suspect that whatever you are trying to
do there is a better approach!
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.flickr.com/photos/alangauldphotos
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Re: [Tutor] python sockets
Lukas Nemec wrote: Hi, fist - are you really triyng to have open 64 000 ports? ok, i suppose you have your reasons, but this is not a good idea - you'll block most applications that use these ports .. The problem is with your main function - you have PORT defined, but it is not global, it is only local, and when you add +1 to it, next spawned process will have PORT with previous value. either use global PORT, or have it as a parameter for the function: main(port): .. PORT = port while startingPort65535: thread.start_new_thread(setup(startingPort)) startingPort=startingPort+1 setup() is still called in the main thread, likely listens forever which is why thread.start_new_thread() is never called and therefore doesn't complain about the missing argument... Try def setup(PORT): ... # don't reassign port inside the function for port in range(startingPort, 65535): thread.start_new_thread(setup, (port,)) Note that some_func(setup(port)) passes the result of the setup() call to some_func while some_func(setup, (port,)) passes the setup function and a 1-tuple with the port as its only item. The comma is necessary to create a tuple, parentheses alone have no effect: (1) 1 (1,) (1,) PS: You should also consider using the (higlevel) threading module instead of the thread module. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python sockets
On Tue, Jun 10, 2014 at 5:28 PM, Jon Engle jon.en...@gmail.com wrote: startingPort=input(\nPlease enter starting port: ) startingPort=int(startingPort) def setup(PORT): PORT = startingPort#arbitrary port not currently in use There's a conflict with this PORT variable. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python sockets
On Tue, Jun 10, 2014 at 9:28 AM, Jon Engle jon.en...@gmail.com wrote: for port in range (startingPort, 65535): thread.start_new_thread(setup, (port,)) startingPort=startingPort+1 #print startingPort I think you just need this: for port in range (startingPort, 65535): thread.start_new_thread(setup(port)) #print port and inside of setup, get rid of this line: PORT = startingPort#arbitrary port not currently in use ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python sockets
On Tue, Jun 10, 2014 at 2:00 PM, Jon Engle jon.en...@gmail.com wrote: Ok, so after making the changes the code does bind the startingPort variable but that is the only port that gets bound. Also when connecting to the startingPort I receive the following error: Please enter starting port: 65520 listening... ...connected! Traceback (most recent call last): File response.py, line 31, in module thread.start_new_thread(setup(port)) TypeError: start_new_thread expected at least 2 arguments, got 1 Sorry about that! I should have read the docs (https://docs.python.org/2/library/thread.html) for thread.start_new_thread(); you had it right in the code you posted (it was the rest of your loop that was a problem.) So, change it back to: for port in range (startingPort, 65535): thread.start_new_thread(setup, (port,)) #print port My apologies for the bum steer. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
