We Keep Coding

Accessing FTP server with Python fails with "getaddrinfo" error

I am trying to access the open DLP Test FTP server as a practice. I keep getting a getaddrinfo error but I am unsure of where I'm going wrong. I am using Python 2 on a Windows 10, and have already checked that I am not behind a proxy.
Code:
from ftplib import FTP
ftp = FTP('ftp://ftp.dlptest.com/')
...
Error:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python27\lib\ftplib.py", line 120, in __init__
self.connect(host)
File "C:\Python27\lib\ftplib.py", line 135, in connect
self.sock = socket.create_connection((self.host, self.port), self.timeout)
File "C:\Python27\lib\socket.py", line 553, in create_connection
for res in getaddrinfo(host, port, 0, SOCK_STREAM):
socket.gaierror: [Errno 11001] getaddrinfo failed
Any help is appreciated!

Use
ftp = FTP('ftp.dlptest.com')
instead.
The first argument of FTP constructor is host – a hostname or an IP address – not a URL.

How i could to make SSl Connection server using username, password by python?

Hello I would ask if i could do connection to extract some data from Tool Server.
so i making this code but i need to modify it to open this tool with username and password and extract data from My tool server.
import socket
import ssl
HOST, PORT = '10.74.159.82', 31039
def handle(conn):
conn.write(b'GET / HTTP/1.1\n')
print(conn.recv() . decode())
def main():
sock = socket.socket(socket.AF_INET)
context = ssl.create_default_context(ssl.Purpose.SERVER_AUTH)
conn = context.wrap_socket(sock, server_hostname=HOST)
try:
conn.connect((HOST, PORT))
handle(conn)
finally:
conn.close()
if __name__ == '__main__':
main()
RESULT
!! C:\Users\Admin\.PyCharmCE2018.1\config\venv\Scripts\python.exe!! C:/Users/Admin/.PyCharmCE2018.1/config/codestyles/Under_Building.py
Traceback (most recent call last):
File "C:/Users/Admin/.PyCharmCE2018.1/config/codestyles/Under_Building.py", line 22, in <module>
main()
File "C:/Users/Admin/.PyCharmCE2018.1/config/codestyles/Under_Building.py", line 16, in main
conn.connect((HOST, PORT))
File "C:\Users\Admin\AppData\Local\Programs\Python\Python37-32\lib\ssl.py", line 1141, in connect
self._real_connect(addr, False)
File "C:\Users\Admin\AppData\Local\Programs\Python\Python37-32\lib\ssl.py", line 1132, in _real_connect
self.do_handshake()
File "C:\Users\Admin\AppData\Local\Programs\Python\Python37-32\lib\ssl.py", line 1108, in do_handshake
self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1045)
Process finished with exit code 1
I'm Beginner so i need to learn and supporting

It's hard to see exactly, but it seems the server you're connecting to (on https://10.74.159.82:31039) is using a self-signed certificate (or its CA is, perhaps).
It's perhaps better to create or buy a proper (non-self-signed) certificate, but assuming this is a test server this is fine.
So with what you have, your best bet is to allow self-signed certs in your SSL Context (and also, not to check the hostname - that will probably fail too as you're using an IP address):
context = ssl.create_default_context()
context.check_hostname=False
context.verify_mode=ssl.CERT_NONE
# etc...

Connecting to Gmail from Python

I've been trying to connect to my Gmail account using python. imap is enabled.
import imaplib
imap_server = imaplib.IMAP4_SSL("imap.gmail.com",993)
# also tried imap_server = imaplib.IMAP4_SSL("imap.gmail.com"), doesnt work.
Traceback is :
Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
imap_server = imaplib.IMAP4_SSL("imap.gmail.com",993)
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/imaplib.py", line 1202, in __init__
IMAP4.__init__(self, host, port)
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/imaplib.py", line 172, in __init__
self.open(host, port)
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/imaplib.py", line 1217, in open
IMAP4.open(self, host, port)
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/imaplib.py", line 248, in open
self.sock = self._create_socket()
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/imaplib.py", line 1205, in _create_socket
sock = IMAP4._create_socket(self)
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/imaplib.py", line 238, in _create_socket
return socket.create_connection((self.host, self.port))
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/socket.py", line 435, in create_connection
raise err
File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/socket.py", line 426, in create_connection
sock.connect(sa)
OSError: [Errno 65] No route to host

What OSError: [Errno 65] No route to host means is what it say: you can't get to that machine from your machine.
You can test that from outside of Python by opening up a terminal/DOS prompt and typing this:
ping imap.gmail.com
It's possible that this is actually a name lookup error, and you're somehow getting a bad address for imap.gmail.com. So, just to be sure, check by IP address too:
ping 74.125.129.108
ping 74.125.129.109
If ping works, you can check whether your router is for some reason just blocking TCP access to the host, e.g., with:
telnet imap.gmail.com
If it's working, this should either hang for a long time, or give you a connection-refused error; if it gives you a no-route-to-host error, it's the same problem you're seeing.
It's also possible that your router is specifically blocking port 993. You can test this too:
telnet imap.gmail.com 993
If it doesn't come back with something like "Connected to gmail-imap.l.google.com", same problem here too.
At any rate, once you've verified that this is a system or network configuration problem, not a programming problem, go ask for help with your system on the appropriate site.

demo python server client interaction

I'm really new to networking in general and I'm trying to set up a simple exchange between a python server and client.
This is the code for the server
import socket, ssl
def do_something(connstream, data):
print "HALLO"
def deal_with_client(connstream):
data = connstream.read()
# null data means the client is finished with us
while data:
if not do_something(connstream, data):
# we'll assume do_something returns False
# when we're finished with client
break
data = connstream.read()
# finished with client
bindsocket = socket.socket()
bindsocket.bind(('127.0.0.1', 10024))
bindsocket.listen(5)
while True:
newsocket, fromaddr = bindsocket.accept()
print "Setting up connection"
connstream = ssl.wrap_socket(newsocket,
server_side=True,
ca_certs=None,
certfile="cert.pem",
keyfile="privatekey.pem",
ssl_version=ssl.PROTOCOL_TLSv1)
try:
deal_with_client(connstream)
finally:
connstream.shutdown(socket.SHUT_RDWR)
connstream.close()
Here is the code for the client.py
import socket, ssl
clientsocket = socket.socket()
ssl_sock = ssl.wrap_socket(clientsocket,
certfile="cert.pem",
cert_reqs=ssl.CERT_REQUIRED)
ssl_sock.connect(('127.0.0.1', 10024))
print ssl_sock.getpeername()
print ssl_sock.getpeercert()
data = ssl_sock.recv(1024)
ssl_sock.close()
print 'Received', repr(data)
I generated the "cert.pem" and the "privatekey.pem" using openssl.
Traceback (most recent call last):
File "server.py", line 30, in <module>
ssl_version=ssl.PROTOCOL_TLSv1)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 344, in wrap_socket
ciphers=ciphers)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 121, in __init__
self.do_handshake()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 283, in do_handshake
self._sslobj.do_handshake()
ssl.SSLError: [Errno 8] _ssl.c:499: EOF occurred in violation of protocol
I was wondering if somehow who knows more could point me in the right direction. I really want to do this using SSL btw, but I would be willing to switch to TLS if that is the better approach.

It could be that the sockets are not running with a compatible ssl version, you should put a "ssl.PROTOCOL_TLSv1" compatible version in your client too (or removing it from server and use the default value too).
Googling you can find many examples of socket comunication

Python FTP (from ftplib module) fails on login to SFTP server

I am doing the following
>> from ftplib import FTP
>> s = FTP('host','user','password') # Connect
and it fails giving the following
Traceback (most recent call last): File "<stdin>", line 1, in <module>
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ftplib.py", line 117, in __init__
self.connect(host)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ftplib.py", line 132, in connect
self.sock = socket.create_connection((self.host, self.port), self.timeout)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 571, in create_connection
raise err socket.error: [Errno 60] Operation timed out
I know that host, user, passwd are correct
How do I debug/fix this error?

WinSCP (which you've otherwise been using to connect to the same server) supports SFTP and SCP, not FTP.
To write a Python program using SFTP, you should be using the Paramiko library.

Try doing it like this:
try:
s = FTP(host)
s.login(user, password)
except Exception, e:
print "The error was:", str(e)