I'm trying to connect to my server using SSH with port 2022 (not 22) in Python. So I wrote the following code that uses Paramiko package:
import sys
import paramiko
try:
client = paramiko.SSHClient()
client.load_system_host_keys()
client.set_missing_host_key_policy(paramiko.WarningPolicy)
client.connect('ccap#10.40.2.222', '2022', '', 'ccap')
finally:
client.close()
But when I'm running it in my IDE (PyCharm) I get the following error:
/usr/local/lib/python3.5/dist-packages/paramiko/ecdsakey.py:164: CryptographyDeprecationWarning: Support for unsafe construction of public numbers from encoded data will be removed in a future version. Please use EllipticCurvePublicKey.from_encoded_point
self.ecdsa_curve.curve_class(), pointinfo
Traceback (most recent call last):
File "/home/mshapirs/PycharmProjects/OnlineTest.py/OnlineTest.py", line 9, in
client.connect('ccap#10.40.2.222', '2022', '', 'ccap')
File "/usr/local/lib/python3.5/dist-packages/paramiko/client.py", line 334, in connect
to_try = list(self._families_and_addresses(hostname, port))
File "/usr/local/lib/python3.5/dist-packages/paramiko/client.py", line 204, in _families_and_addresses
hostname, port, socket.AF_UNSPEC, socket.SOCK_STREAM
File "/usr/lib/python3.5/socket.py", line 733, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known
You should provide username as a separate parameter, not prepended to the host address.
Look at the docs for .connect. It has username and hostnamelisted separately.
Related
I am trying to connect to SFTP server but it returns error:
[Errno 11001] getaddrinfo failed
I am using Python 3.7.3 and Paramiko version is 2.6.0
import paramiko
host_name = "sftp://81.149.151.143"
user_name = "******"
password = "******"
ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_client.connect(hostname=host_name, port=220, username=user_name, password=password)
ftp_client=ssh_client.open_sftp()
ftp_client.put('***/issue_1.docx', '/issue_1.docx')
ftp_client.close()
This is the full error:
Traceback (most recent call last):
File "/sftp/paramiko_bot.py", line 10, in <module>
ssh_client.connect(hostname=host_name, port=22, username=user_name, password=password)
File "\Local\Programs\Python\Python37\lib\site-packages\paramiko\client.py", line 340, in connect
to_try = list(self._families_and_addresses(hostname, port))
File "\Local\Programs\Python\Python37\lib\site-packages\paramiko\client.py", line 204, in _families_and_addresses
hostname, port, socket.AF_UNSPEC, socket.SOCK_STREAM
File "\AppData\Local\Programs\Python\Python37\lib\socket.py", line 748, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno 11001] getaddrinfo failed
The hostname parameter of SSHClient.connect should contain a hostname only (or in your case an IP address) – not any kind of URL.
ssh_client.connect(hostname="81.149.151.143", port=220, username=..., password=...)
Obligatory warning: Do not use AutoAddPolicy this way – You are losing a protection against MITM attacks by doing so. For a correct solution, see Paramiko "Unknown Server".
I'm trying to use a Beaglebone Black (BBB) to send email notifications, but I'm getting caught up on this getaddrinfo error that reads as follows;
socket.gaierror: [Errno -2] Name or service not known
I've been working on this for a while and can't find why this isn't working.
The nano file I"m trying to run:
import smtplib
#import time
smtpObj = smtplib.SMTP('smtp.gmail.com', 587)
#time.sleep(1000)
print("SMTP object created...")
smtpObj.ehlo()
#time.sleep(1000)
print("EHLO...")
smtpObj.starttls()
#time.sleep(1000)
print("Starting TLS...")
smtpObj.login('EXAMPLEACCOUNT#gmail.com', 'EXAMPLEPASSWORD')
#time.sleep(1000)
print("Logged into EXAMPLEACCOUNT#gmail.com...")
smtpObj.sendmail('EXAMPLEACCOUNT#gmail.com', 'EXAMPLERECIPIENT', '''Subject:test subject \ntest body
Auto Alert System.''')
{}
#time.sleep(1000)
print("Sending email...")
smtpObj.quit()
#time.sleep(1000)
print("Destorying object.")
The output of invoking the test_email2.py function is as follows:
root#beaglebone:~/Desktop/email_project# python test_email2.py
Traceback (most recent call last):
File "test_email2.py", line 4, in <module>
smtpObj = smtplib.SMTP('smtp.gmail.com', 587)
File "/usr/lib/python2.7/smtplib.py", line 249, in __init__
(code, msg) = self.connect(host, port)
File "/usr/lib/python2.7/smtplib.py", line 309, in connect
self.sock = self._get_socket(host, port, self.timeout)
File "/usr/lib/python2.7/smtplib.py", line 284, in _get_socket
return socket.create_connection((port, host), timeout)
File "/usr/lib/python2.7/socket.py", line 553, in create_connection
for res in getaddrinfo(host, port, 0, SOCK_STREAM):
socket.gaierror: [Errno -2] Name or service not known
The format I've been following is based on that provided by https://automatetheboringstuff.com/chapter16/
socket.gaierror means that (underlying in libc) getaddrinfo function failed to get IP addresses for domain names you provided. It explains why it failed: [Errno -2] Name or service not known, so it doesn't know about a domain with such a name, smtp.gmail.com. This domain name obviously exists, so you should look into DNS system settings in your BBB system (and it's actually more of a SuperUser community question).
What DNS servers are used in configuration? If you're using a local caching DNS server at loopback, is it up and running? Is it configured properly to allow recursive requests? This particular problem most likely has nothing to do with Python or your code; it's your BBB system cannot resolve at least some, if not all, domain names.
Name resolution may fail because there is no ip associated with the hostname, or because the DNS server cannot be reached. Unfortunately, Python's socket.create_connection and socket.gethostbyname functions seem to raise the same error in both situations:
$ python3 -c 'import socket; socket.create_connection(("www.google.com_bar", 80))'
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python3.4/socket.py", line 491, in create_connection
for res in getaddrinfo(host, port, 0, SOCK_STREAM):
File "/usr/lib/python3.4/socket.py", line 530, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known
$ python3 -c 'import socket; socket.gethostbyname("www.google_bar.com")'
Traceback (most recent call last):
File "<string>", line 1, in <module>
socket.gaierror: [Errno -5] No address associated with hostname
$ sudo vim /etc/resolv.conf # point to non-existing nameserver
$ python3 -c 'import socket; socket.create_connection(("www.google.com", 80))'
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python3.4/socket.py", line 491, in create_connection
for res in getaddrinfo(host, port, 0, SOCK_STREAM):
File "/usr/lib/python3.4/socket.py", line 530, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known
$ python3 -c 'import socket; socket.gethostbyname("www.google.com")'
Traceback (most recent call last):
File "<string>", line 1, in <module>
socket.gaierror: [Errno -5] No address associated with hostname
Is there any way to distinguish these two cases that does not require me to perform a second lookup for a "known-good" hostname?
The solution should work under Linux.
You can use the dnslib library client to make the DNS request yourself. The client provides dig like functionality that can indicate if an address fails to resolve (NXDOMAIN) compared to just failing to resolve (which unfortunately just blocks - see patch below).
You use it like so:
from dnslib import DNSRecord, RCODE
# I have dnsmasq running locally, so I can make requests to localhost.
# You need to find the address of the DNS server.
# The /etc/resolv.conf file is quite easily parsed, so you can just do that.
DNS_SERVER = "127.0.0.1"
query = DNSRecord.question("google.com")
response = DNSRecord.parse(query.send(DNS_SERVER, 53, False))
print RCODE[response.header.rcode] # prints 'NOERROR'
query = DNSRecord.question("google.com_bar")
response = DNSRecord.parse(query.send(DNS_SERVER, 53, False))
print RCODE[response.header.rcode] # prints 'NXDOMAIN'
# To avoid making the DNS request again when using the socket
# you can get the resolved IP address from the response.
The problem comes when making a connection to a non existant DNS Server. Every time I have tried this the request just hangs. (When I make the same requests on the command line, using something like netcat, the request also just hangs. I may be picking random IPs poorly and suffering from firewalls that just drop the packets)
Anyway you can alter the source code to add a timeout. You can view the relevant method in the source here (also mirrored on github). What I changed was:
--- a/dns.py
+++ b/dns.py
## -357,6 +357,7 ##
response = response[2:]
else:
sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
+ sock.settimeout(10)
sock.sendto(self.pack(),(dest,port))
response,server = sock.recvfrom(8192)
sock.close()
After doing this the DNS request timed out.
I am using Python's paramiko package to connect to a remote Unix machine. I have written this code:
import paramiko
import sys
import os
import os.path
passwd = "XXX"
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect("173.15.13.28", "root", password=passwd)
stdin, stdout, stderr = ssh.exec_command('ls')
x = stdout.readlines()
print x
for line in x:
print line
ssh.close()
after executing I am getting this error:
Traceback (most recent call last):
File "<pyshell#9>", line 1, in <module>
ssh.connect("173.15.13.28", "root", password="--------")
File "C:\Python27\lib\site-packages\paramiko\client.py", line 282, in connect
for (family, socktype, proto, canonname, sockaddr) in socket.getaddrinfo(hostname, port,socket.AF_UNSPEC, socket.SOCK_STREAM):
gaierror: [Errno 10109] getaddrinfo failed
I don't know what the problem is.
The second argument of the connect() method is the port number, which defaults to 22. You are putting "root" there, which won't work. Use the keyword argument username="root". That is, try this:
ssh.connect("173.15.13.28", username="root", password=passwd)
See also: python paramiko, getaddrinfo error when trying to establish an SSH connection
i get the following error when trying a script thaat sends mail
import urllib.request
import re
import smtplib
from email.mime.text import MIMEText
from bs4 import BeautifulSoup
page=urllib.request.urlopen("http://www.crummy.com/")
soup=BeautifulSoup(page)
v=soup.findAll('a',href=re.compile('http://www.crummy.com/2012/07/24/0'))
for link in v:
w=link.get('href')
server = smtplib.SMTP( "smtp.gmail.com", 587 )
server.starttls()
server.login( 'xxxxxxxxxxx', 'xxxxxxx' )
server.sendmail( 'xxxxxxxxx', 'xxxxxxxxx', "bonus question is up" )
Traceback (most recent call last): File "C:\Python32\bonus", line 14,
in server = smtplib.SMTP( "smtp.gmail.com", 587 ) File
"C:\Python32\lib\smtplib.py", line 259, in init File
"C:\Python32\lib\smtplib.py", line 319, in connect
self.sock = self._get_socket(host, port, self.timeout) File "C:\Python32 \lib\smtplib.py", line 294, in _get_socket
return socket.create_connection((host, port), timeout) File "C:\Python32\lib\socket.py", line 386, in create_connection
for res in getaddrinfo(host, port, 0, SOCK_STREAM): socket.gaierror: [Errno 11004] getaddrinfo failed plse advice on the
best way to go round it
The getaddrinfo function has this purpose:
The getaddrinfo function provides protocol-independent translation from an ANSI host name to an address.
If it fails it means that it cannot translate your given hostname to it's respective address. It's essentially doing a DNS query.
Your error number returned "11004" by getaddrinfo has this message associated with it:
Valid name, no data record of requested type. The requested name is
valid and was found in the database, but it does not have the correct
associated data being resolved for. The usual example for this is a
host name-to-address translation attempt (using gethostbyname or
WSAAsyncGetHostByName) which uses the DNS (Domain Name Server). An MX
record is returned but no A record—indicating the host itself exists,
but is not directly reachable.
It seems the name you're looking up has no correct data associated with it.
Are you sure your URL's are correct?
Links:
getaddrinfo: http://msdn.microsoft.com/en-us/library/windows/desktop/ms738520(v=vs.85).aspx
WinSock Error Codes: http://msdn.microsoft.com/en-us/library/windows/desktop/ms740668(v=vs.85).aspx