rhumba: Add Ouroboros commands and SSH helpers

This adds initial support for Ouroboros. It installs and sets up the
stack, and binds ap names to names. It also moves the SSH helper
functions to common ground, so that every file can use them.

1 files changed, 156 insertions, 0 deletions

diff --git a/ssh_support.py b/ssh_support.py
new file mode 100644
index 0000000..6bc892f
--- /dev/null
+++ b/ssh_support.py
@@ -0,0 +1,156 @@
+#
+# 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)