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# Copyright 2021 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
import os
import sys
import tempfile
from ftplib import FTP
import urllib.parse
import urllib.request
from vyos.util import cmd
from paramiko import SSHClient
def upload_ftp(local_path, hostname, remote_path,\
username='anonymous', password='', port=21):
with open(local_path, 'rb') as file:
with FTP() as conn:
conn.connect(hostname, port)
conn.login(username, password)
conn.storbinary(f'STOR {remote_path}', file)
def download_ftp(local_path, hostname, remote_path,\
username='anonymous', password='', port=21):
with open(local_path, 'wb') as file:
with FTP() as conn:
conn.connect(hostname, port)
conn.login(username, password)
conn.retrbinary(f'RETR {remote_path}', file.write)
def upload_sftp(local_path, hostname, remote_path,\
username=None, password=None, port=22):
with SSHClient() as ssh:
ssh.load_system_host_keys()
ssh.connect(hostname, port, username, password)
with ssh.open_sftp() as sftp:
sftp.put(local_path, remote_path)
def download_sftp(local_path, hostname, remote_path,\
username=None, password=None, port=22):
with SSHClient() as ssh:
ssh.load_system_host_keys()
ssh.connect(hostname, port, username, password)
with ssh.open_sftp() as sftp:
sftp.get(remote_path, local_path)
def upload_tftp(local_path, hostname, remote_path, port=69):
with open(local_path, 'rb') as file:
cmd(f'curl -s -T - tftp://{hostname}:{port}/{remote_path}', stderr=None, input=file.read())
def download_tftp(local_path, hostname, remote_path, port=69):
with open(local_path, 'wb') as file:
file.write(cmd(f'curl -s tftp://{hostname}:{port}/{remote_path}', stderr=None))
def download_http(urlstring, local_path):
with open(local_path, 'wb') as file:
with urllib.request.urlopen(urlstring) as response:
file.write(response.read())
def download(local_path, urlstring):
"""
Dispatch the appropriate download function for the given URL and save to local path.
"""
url = urllib.parse.urlparse(urlstring)
if url.scheme == 'http' or url.scheme == 'https':
download_http(urlstring, local_path)
elif url.scheme == 'ftp':
username = url.username if url.username else 'anonymous'
download_ftp(local_path, url.hostname, url.path, username, url.password)
elif url.scheme == 'sftp' or url.scheme == 'scp':
# None means we don't want to use password authentication.
# An empty string (what urlparse returns when a password doesn't
# exist in the URL) means the password is an empty string.
password = url.password if url.password else None
download_sftp(local_path, url.hostname, url.path, url.username, password)
elif url.scheme == 'tftp':
download_tftp(local_path, url.hostname, url.path)
else:
ValueError(f'Unsupported URL scheme: {url.scheme}')
def upload(local_path, urlstring):
"""
Dispatch the appropriate upload function for the given URL and upload from local path.
"""
url = urllib.parse.urlparse(urlstring)
if url.scheme == 'ftp':
username = url.username if url.username else 'anonymous'
upload_ftp(local_path, url.hostname, url.path, username, url.password)
elif url.scheme == 'sftp' or url.scheme == 'scp':
password = url.password if url.password else None
upload_sftp(local_path, url.hostname, url.path, url.username, password)
elif url.scheme == 'tftp':
upload_tftp(local_path, url.hostname, url.path)
else:
ValueError(f'Unsupported URL scheme: {url.scheme}')
def get_remote_config(urlstring):
"""
Download remote (config) file and return the contents.
Args:
remote file URI:
scp://<user>[:<passwd>]@<host>/<file>
sftp://<user>[:<passwd>]@<host>/<file>
http://<host>/<file>
https://<host>/<file>
ftp://[<user>[:<passwd>]@]<host>/<file>
tftp://<host>/<file>
"""
url = urllib.parse.urlparse(urlstring)
temp = tempfile.NamedTemporaryFile(delete=False).name
try:
download(temp, urlstring)
with open(temp, 'r') as file:
return file.read()
finally:
os.remove(temp)
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