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#
# SSH support for Rhumba
#
# Sander Vrijders <sander.vrijders@intec.ugent.be>
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA
import paramiko
def get_ssh_client():
ssh_client = paramiko.SSHClient()
ssh_client.load_system_host_keys()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
return ssh_client
def execute_commands(testbed, hostname, commands, time_out = 3):
'''
Remote execution of a list of shell command on hostname. By
default this function will exit (timeout) after 3 seconds.
@param testbed: testbed info
@param hostname: host name or ip address of the node
@param command: *nix shell command
@param time_out: time_out value in seconds, error will be generated if
no result received in given number of seconds, the value None can
be used when no timeout is needed
'''
ssh_client = get_ssh_client()
try:
ssh_client.connect(hostname, 22,
testbed.username, testbed.password,
look_for_keys = True, timeout = time_out)
for command in commands:
stdin, stdout, stderr = ssh_client.exec_command(command)
err = str(stderr.read()).strip('b\'\"\\n')
if err != "":
err_array = err.split('\\n')
for erra in err_array:
print(erra)
ssh_client.close()
except Exception as e:
print(str(e))
return
def execute_command(testbed, hostname, command, time_out = 3):
'''
Remote execution of a list of shell command on hostname. By
default this function will exit (timeout) after 3 seconds.
@param testbed: testbed info
@param hostname: host name or ip address of the node
@param command: *nix shell command
@param time_out: time_out value in seconds, error will be generated if
no result received in given number of seconds, the value None can
be used when no timeout is needed
@return: stdout resulting from the command
'''
ssh_client = get_ssh_client()
try:
ssh_client.connect(hostname, 22,
testbed.username, testbed.password,
look_for_keys = True, timeout = time_out)
stdin, stdout, stderr = ssh_client.exec_command(command)
err = str(stderr.read()).strip('b\'\"\\n')
if err != "":
print(err)
output = str(stdout.read()).strip('b\'\"\\n')
ssh_client.close()
return output
except Exception as e:
print(str(e))
return
def copy_file_to_testbed(testbed, hostname, text, file_name):
'''
Write a string to a given remote file.
Overwrite the complete file if it already exists!
@param testbed: testbed info
@param hostname: host name or ip address of the node
@param text: string to be written in file
@param file_name: file name (including full path) on the host
'''
ssh_client = get_ssh_client()
try:
ssh_client.connect(hostname, 22,
testbed.username,
testbed.password,
look_for_keys=True)
cmd = "touch " + file_name + \
"; chmod a+rwx " + file_name
stdin, stdout, stderr = ssh_client.exec_command(cmd)
err = str(stderr.read()).strip('b\'\"\\n')
if err != "":
print(err)
sftp_client = ssh_client.open_sftp()
remote_file = sftp_client.open(file_name, 'w')
remote_file.write(text)
remote_file.close()
except Exception as e:
print(str(e))
def setup_vlan(testbed, node_name, vlan_id, int_name):
'''
Gets the interface (ethx) to link mapping
@param testbed: testbed info
@param node_name: the node to create the VLAN on
@param vlan_id: the VLAN id
@param int_name: the name of the interface
'''
print("Setting up VLAN on node " + node_name)
node_full_name = full_name(node_name, testbed)
cmd = "sudo ip link add link " + \
str(int_name) + \
" name " + str(int_name) + \
"." + str(vlan_id) + \
" type vlan id " + str(vlan_id)
execute_command(testbed, node_full_name, cmd)
cmd = "sudo ifconfig " + \
str(int_name) + "." + \
str(vlan_id) + " up"
execute_command(node_full_name, cmd, testbed)
cmd = "sudo ethtool -K " + \
str(int_name) + " rxvlan off"
execute_command(node_full_name, cmd, testbed)
cmd = "sudo ethtool -K " + \
str(int_name) + " txvlan off"
execute_command(node_full_name, cmd, testbed)
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