76 lines
2.1 KiB
Python
76 lines
2.1 KiB
Python
# Copyright (C) 2011-2012 OpenStack LLC.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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#
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import socket
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import subprocess
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import time
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import paramiko
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from sshclient import SSHClient
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def iterate_timeout(max_seconds, purpose):
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start = time.time()
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count = 0
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while (time.time() < start + max_seconds):
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count += 1
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yield count
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time.sleep(2)
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raise Exception("Timeout waiting for %s" % purpose)
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def nodescan(ip, port=22, timeout=60):
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"""Scan the IP address for public SSH keys.
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Returns SSH host key
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"""
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key = None
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output = None
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for count in iterate_timeout(
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timeout, "connection to %s on port %s" % (ip, port)):
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try:
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output = subprocess.check_output(
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['ssh-keyscan', '-t', 'ed25519', '-p', str(port), str(ip)])
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if output:
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break
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except Exception as e:
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print("ssh-keyscan failure: %s", e)
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key = output.split()[2].decode('utf8')
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return key
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def ssh_connect(ip, username, connect_kwargs={}, timeout=60):
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# HPcloud may return errno 111 for about 30 seconds after adding the IP
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for count in iterate_timeout(timeout, "ssh access"):
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try:
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client = SSHClient(ip, username, **connect_kwargs)
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break
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except socket.error as e:
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print("While testing ssh access:", e)
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time.sleep(5)
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except paramiko.ssh_exception.AuthenticationException:
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return None
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ret, out = client.ssh("echo access okay")
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if "access okay" in out:
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return client
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return None
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