[Tutor] Localhost client-server simple ssl socket test program problems
George Nyoro
geonyoro at gmail.com
Fri Dec 16 06:31:34 CET 2011
>You're trying to connect to the same port on
>localhost as a client and a
>server? I don't know for certain but I don't
>think that should work.
>Two computers?
--
>Alexander
it should work. I did short tutorial on this like a month ago and it
worked. The only difference is that in mine it didn't have the part
below which is the source of the problem. Also, in mine, I used "send"
and "recv" though I doubt this makes any difference.
> ssl_sock = ssl.wrap_socket(s,
> ca_certs="/home/ckyang/PHA/testsslsocket/
myCA.crt",
> cert_reqs=ssl.CERT_REQUIRED)
> ssl_sock.connect(("127.0.0.1", 1234))
On 15/12/2011, tutor-request at python.org <tutor-request at python.org> wrote:
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> Today's Topics:
>
> 1. Re: Localhost client-server simple ssl socket test program
> problems (Alexander)
> 2. timeit() help (Robert Sjoblom)
> 3. [TUTOR]Code Deciphering (Calle)
> 4. Re: [TUTOR]Code Deciphering (Robert Sjoblom)
> 5. modify values for object derived from datetime.datetime
> (rail shafigulin)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 15 Dec 2011 14:24:37 -0500
> From: Alexander <rhettnaxel at gmail.com>
> To: Yang Chun-Kai <waitmeforever at hotmail.com>
> Cc: python-list at python.org, tutor at python.org
> Subject: Re: [Tutor] Localhost client-server simple ssl socket test
> program problems
> Message-ID:
> <CANS6qmBmSVefw=2-TbTZt472nR86DDOO3JUbyTm4OTTPXGQ4zQ at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> 2011/12/15 Yang Chun-Kai <waitmeforever at hotmail.com>
>
>> Hello,everyone!!
>>
>> I am writing a simple ssl client-server test program on my personal
>> laptop.
>>
>> And I encounter some problems with my simple programs.
>>
>> Please give me some helps.
>>
>> --------------------------------------------------------------------------------------------------------------------------------------------------------
>>
>> My server code:
>>
>> import socket
>> import ssl
>> bindsocket = socket.socket()
>> bindsocket.bind(('127.0.0.1', 1234))
>> bindsocket.listen(5)
>> print 'server is waiting for connection...'
>> newsocket, fromaddr = bindsocket.accept()
>> print 'start ssl socket...'
>> connstream = ssl.wrap_socket(newsocket, server_side=True,
>> certfile="/etc/home/ckyang/PHA/testsslsocket/mypha.crt",
>> keyfile="/etc/home/ckyang/PHA/testsslsocket/mypha.key",
>> ssl_version=ssl.PROTOCOL_SSLv23)
>> data = connstream.read()
>> print 'connected from address', fromaddr
>> print 'received data as', repr(data)
>> connstream.close()
>>
>> My client code:
>>
>> import socket
>> import ssl
>> s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
>> ssl_sock = ssl.wrap_socket(s,
>> ca_certs="/home/ckyang/PHA/testsslsocket/myCA.crt",
>> cert_reqs=ssl.CERT_REQUIRED)
>> ssl_sock.connect(("127.0.0.1", 1234))
>> ssl_sock.write("hello")
>> ssl_sock.close()
>>
>>
>> -----------------------------------------------------------------------------------------------------------------------------------------------------------
>> Server side error:
>>
>> File "views.py", line 17, in & lt;module>
>> connstream = ssl.wrap_socket(newsocket, server_side=True,
>> certfile="/etc/home/ckyang/PHA/testsslsocket/mypha.crt",
>> keyfile="/etc/home/ckyang/PHA/testsslsocket/mypha.key",
>> ssl_version=ssl.PROTOCOL_SSLv23)
>> File "/usr/lib/python2.7/ssl.py", line 344, in wrap_socket
>> ciphers=ciphers)
>> File "/usr/lib/python2.7/ssl.py", line 119, in __init__
>> ciphers)
>> ssl.SSLError: [Errno 336265218] _ssl.c:347: error:140B0002:SSL
>> routines:SSL_CTX_use_PrivateKey_file:system lib
>>
>> Client side error:
>>
>> File "client.py", line 10, in <module>
>> ssl_sock.connect(("127.0.0.1", 1234))
>> File "/usr/lib/python2.7/ssl.py", line 299, in connect**
>> self.do_handshake()
>> File "/usr/lib/python2.7/ssl.py", line 283, in do_handshake
>> self._sslobj.do_handshake()
>> socket.error: [Errno 104] Connection reset by peer
>>
>>
>> ------------------------------------------------------------------------------------------------------------------------------------------------------------
>> So what is wrong with my code?
>>
>> The codes are so simple and so much like python official site sample
>> demonstration, but I still cant get it work, so frustrating.
>>
>> Seems the problem happened on server side then cause client side cant
>> connect well, is that right?
>>
>> **
>> My platform is ubuntu, with openssl 0.9.8 and python 2.7.
>>
>> All certificates and keys self-signed by openssl for test convenience.
>>
>> This is the site for referrence :
>> http://andyjeffries.co.uk/articles/x509-encrypted-authenticated-socket-ruby-client
>>
>> Or should I need a real certificate issued by a real CA to let things
>> work?
>>
>> Any tips or suggestions welcomed, thank you very much~
>>
>> Good day.
>>
>> Kay
>>
>> **
>>
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>>
> You're trying to connect to the same port on localhost as a client and a
> server? I don't know for certain but I don't think that should work.
> Two computers?
>
>
> --
> Alexander
> 7D9C597B
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> ------------------------------
>
> Message: 2
> Date: Thu, 15 Dec 2011 20:59:29 +0100
> From: Robert Sjoblom <robert.sjoblom at gmail.com>
> To: Tutor - python List <tutor at python.org>
> Subject: [Tutor] timeit() help
> Message-ID:
> <CAJKU7g2w8RJp83RNnc+5pZqH5WBqtZpAAiQnOwS-fUapwjmynw at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> So, it turns out that my ISP blocked Project Euler, so instead of
> working on my next problem, I polished Problem 4 a bit:
>
>>A palindromic number reads the same both ways. The largest palindrome made
>> from the product of two 2-digit numbers is 9009 = 91 ? 99.
>>Find the largest palindrome made from the product of two 3-digit numbers.
>
> Those who don't want spoilers should look away.
>
> While it's perfectly fine to brute-force this (what I initially did)
> with two for-loops, I wanted to make a better version. Here's the
> code:
>
> First something to check whether a number is a palindrome:
> def is_palindrome(number):
> number = str(number)
> return number == number[::-1]
>
> Then the crunching part:
>
> def biggest():
> big_x, big_y, max_seen = 0, 0, 0
> for x in range(999, 99, -1):
> for y in range(x, 99, -1): #so we don't double count
> if x*y < max_seen: continue #since we're decreasing
> if is_palindrome(x*y):
> big_x, big_y, max_seen = x, y, x*y
> return big_x, big_y, max_seen
>
> However, I got to thinking... If we assume that the palindrome starts
> with 9, it must end with 9 (I think that's a fair assumption, really
> -- but it could come back and bite me I suppose). That means that the
> only values for the third digit in each of the two factors would have
> to be 1, 3, 7 or 9 (1 * 9, 3 * 3, 7 * 7 or 9 * 1). If we check for
> this condition before checking whether a number is palindromic, we
> ought to cut down on the numbers checked by, oh, I don't know... half,
> at least? (it turns out that it's more: 405450 values, only 64980 have
> 1, 3, 7 or 9 in the end), so in order to avoid checking some 340,000
> numbers, I wrote a third function:
>
> def check_value(number1, number2):
> number1, number2 = str(number1), str(number2)
> return number1[-1] in "1379" and number2[-1] in "1379"
>
> Putting this one inside the biggest() function, the final biggest()
> function looks like this:
>
> def biggest():
> big_x, big_y, max_seen = 0, 0, 0
> for x in range(999, 99, -1):
> for y in range(x, 99, -1): #so we don't double count
> if check_value(x, y): #we ignore all numbers that
> doesn't end in 1379
> if x*y < max_seen: continue #since we're decreasing
> if is_palindrome(x*y):
> big_x, big_y, max_seen = x, y, x*y
> return big_x, big_y, max_seen
>
> My biggest problem now is that I don't know how to measure any changes
> in efficiency. I know that the functions are working perfectly fine
> as-is, and I shouldn't really optimize without a need to, but I'm
> mostly curious as to whether the check_value() function is worth it or
> not. To this I thought I'd use timeit(), but I can't for the life of
> me work out how it works. At all. I've tried using it from the command
> prompt, from the interpreter and in the code itself and it just
> doesn't work. Or, it might very well work but it doesn't actually time
> anything for me. It's very frustrating, but I feel like I'm too stupid
> to read the official documentation for it (that is, I might understand
> the words in the documentation, but I can't get it to work). Please
> help?
>
> --
> best regards,
> Robert S.
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 15 Dec 2011 22:09:20 +0100
> From: "Calle" <Calle_Python at live.se>
> To: <tutor at python.org>
> Subject: [Tutor] [TUTOR]Code Deciphering
> Message-ID: <DUB109-DS323696802B29051022AA06F8A30 at phx.gbl>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Hi!
>
> I was wondering, how do you use Python to decipher codes? It feels like it
> should be pretty simple, but I haven't found any tutorials about it yet.
>
> Have a nice day!
> //
> Calle
>
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 15 Dec 2011 22:34:41 +0100
> From: Robert Sjoblom <robert.sjoblom at gmail.com>
> To: Calle <Calle_Python at live.se>
> Cc: tutor at python.org
> Subject: Re: [Tutor] [TUTOR]Code Deciphering
> Message-ID:
> <CAJKU7g1fq=sLEDO0GnCJkZoBe30oZJ9v2z4OPNFx3KwbFzGv4Q at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
>> I was wondering, how do you use Python to decipher codes? It feels like it
>> should be pretty simple, but I haven't found any tutorials about it yet.
>
> What kind of codes? Or do you mean ciphers? Generally speaking, a code
> represent letters or numbers in transmitting a message. In other
> words, a code deals with phrases and sentences or whole words. Example
> "steal the cabbage at dawn" could mean "kill the king on wednesday".
>
> A cipher deals with letters. It is a message written in letters in a
> predetermined code. This means that a cipher is a system of
> communication that uses letters instead of phrases. Examples being the
> standard Caesar cipher where "APPLE" might be written "BQQMB" (ie,
> shifted one letter to the right).
> --
> best regards,
> Robert S.
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 15 Dec 2011 17:01:28 -0500
> From: rail shafigulin <rail.shafigulin at gmail.com>
> To: tutor at python.org
> Subject: [Tutor] modify values for object derived from
> datetime.datetime
> Message-ID:
> <CAFAaeRXOeatX9C-gbjgz2ORjaOXFSmX41ef1SoSEU+qPQ0wq1A at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> i writing some code to do device testing at my work. testing is related to
> date and time, so naturally i decided to create a class that inherits from
> datetime.datetime. main reason is that i need to add, subtract and compare
> datetime objects and datetime.datetime allows me to do that. here is the
> code:
>
> class LTime(datetime.datetime):
> TOLERANCE = 10
>
> def __new__(self, year, month, day, *args):
> if year == 0:
> year = 2000
>
> return super().__new__(self, year, month, day, *args)
>
> def modify(self):
> self = self.replace(2012, 12, 12)
> print(self)
>
>
> def main():
> mytime = LTime.now()
> mytime.modify()
> print(mytime)
>
> if __name__ == '__main__':
> main()
>
> the problem that i see is that i'm not able to modify date and time because
> it seems that those attributes are immutable. another problem that i see is
> in the modify() routine. if you print mytime the date and time are still
> old. can anybody explain why this is happening and if it is even possible
> to achieve what i'm trying to achieve, which is to change self.date and
> self.time
>
> any help is appreciated.
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