Added new module for basic bridge management

1 files changed, 162 insertions, 0 deletions

diff --git a/func/minion/modules/bridge.py b/func/minion/modules/bridge.py
new file mode 100644
index 0000000..84ce499
--- /dev/null
+++ b/func/minion/modules/bridge.py
@@ -0,0 +1,162 @@
+#!/usr/bin/python
+#
+# Copyright 2008, Stone-IT
+# Jasper Capel <capel@stone-it.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301  USA
+
+import func_module
+import os
+
+class Bridge(func_module.FuncModule):
+    version = "0.0.1"
+    api_version = "0.0.1"
+    description = "Func module for Bridge management"
+
+    # A list of bridge names that should be ignored. You can use this if you
+    # have bridges that should never be touched by func.
+    ignorebridges = [ "virbr0" ]
+    brctl = "/usr/sbin/brctl"
+    ip = "/sbin/ip"
+
+    def list(self):
+        # Returns a dictionary. Elements look like this:
+        # key: bridgename, value: [ interface1, interface2, ..., interfacen ]
+
+        retlist = {}
+
+        command = self.brctl + " show"
+
+        fp = os.popen(command)
+
+        # Read output, discard the first line (header):
+        # Example output:
+        # bridge name   bridge id       STP enabled interfaces
+        # mgmtbr        8000.feffffffffff   no      vif12.0
+        #                                           vif11.0
+        # netsbr        8000.feffffffffff   no      pbond1
+        #                                           vif0.2
+
+        lines = fp.readlines()[1:]
+        fp.close()
+
+        curbr = ""
+        for line in lines:
+            elements = line.split()
+
+            if len(elements) > 1:
+                # Line containing a new bridge name + interface
+                curbr = elements[0]
+                if not curbr in self.ignorebridges:
+                    if len(elements) == 3:
+                        # This is a bridge without connected devices
+                        retlist[elements[0]] = [ ]
+                    elif len(elements) == 4:
+                        # This is a bridge with one or more devices attached to
+                        # it.
+                        retlist[elements[0]] = [ elements[3] ]
+
+            elif len(elements) == 1:
+                # Dictionary key containing interface name should already
+                # exist, append the interface.
+                if not curbr in self.ignorebridges:
+                    retlist[curbr].append(elements[0])
+    
+        return retlist
+    
+    def addbr(self, brname):
+        # Creates a bridge
+        if brname not in self.ignorebridges:
+            exitcode = os.spawnv(os.P_WAIT, self.brctl, [ self.brctl, "addbr", brname ] )
+        else:
+            exitcode = -1
+
+        return exitcode
+
+    def addif(self, brname, ifname):
+        # Adds an interface to a bridge
+        if brname not in self.ignorebridges:
+            exitcode = os.spawnv(os.P_WAIT, self.brctl, [ self.brctl, "addif", brname, ifname ] )
+        else:
+            exitcode = -1
+
+        return exitcode
+
+    def delbr(self, brname):
+        # Deletes a bridge
+        if brname not in self.ignorebridges:
+            # This needs some more error checking. :)
+            exitcode = os.spawnv(os.P_WAIT, self.brctl, [ self.brctl, "delbr", brname ] )
+        else:
+            exitcode = -1
+
+        return exitcode
+    
+    def delif(self, brname, ifname):
+        # Deletes an interface from a bridge
+        if brname not in self.ignorebridges:
+            exitcode = os.spawnv(os.P_WAIT, self.brctl, [ self.brctl, "delif", brname, ifname ] )
+        else:
+            exitcode = -1
+
+        return exitcode
+
+    def addxenbr(self, brname, ifname):
+        # Does all the magic required to create a bridge for Xen to use for
+        # DomUs.
+        addbrret = self.addbr(brname)
+        addifret = self.addif(brname,ifname)
+        # Set the MAC address of the interface we're adding to the bridge to
+        # FE:FF:FF:FF:FF:FF. This is consistent with the behaviour of the
+        # Xen network-bridge script.
+        setaddrret = os.spawnv(os.P_WAIT, self.ip, [ self.ip, "link", "set", ifname, "address", "fe:ff:ff:ff:ff:ff" ])
+        if addbrret or addifret or setaddrret:
+            return -1
+        else:
+            return 0
+
+    def updownbr(self, brname, up):
+        # Marks a bridge and all it's connected interfaces up.
+
+        if up:
+            updown = "up"
+        else:
+            updown = "down"
+
+        bridges = self.list()
+        if not brname in bridges:
+            # Bridge doesn't exist, or should be ignored.
+            return -1
+
+        interfaces = [ brname ]
+        for bridgemember in bridges[brname]:
+            interfaces.append(bridgemember)
+
+        exitcode = 0
+
+        for ifname in interfaces:
+            retcode = os.spawnv(os.P_WAIT, self.ip, [self.ip, "link", "set", ifname, updown ] )
+            if retcode != 0:
+                exitcode = retcode
+
+        return exitcode
+
+    def upbr(self, brname):
+        return self.updownbr(brname, 1)
+
+    def downbr(self, brname):
+        return self.updownbr(brname, 0)
+