Split net-parsing into own module

The ubuntu/debian networking file parsing function
really is more generic than just a rhel utility function
and can be used by others that want to use this functionality
for there own purposes (say in writing down a freebsd network
format instead) so moving this to its own module to encourage
its usage outside of rhel.

1 files changed, 110 insertions, 0 deletions

diff --git a/cloudinit/distros/net_util.py b/cloudinit/distros/net_util.py
new file mode 100644
index 00000000..4c9095be
--- /dev/null
+++ b/cloudinit/distros/net_util.py
@@ -0,0 +1,110 @@
+# vi: ts=4 expandtab
+#
+#    Copyright (C) 2012 Canonical Ltd.
+#    Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P.
+#    Copyright (C) 2012 Yahoo! Inc.
+#
+#    Author: Scott Moser <scott.moser@canonical.com>
+#    Author: Juerg Haefliger <juerg.haefliger@hp.com>
+#    Author: Joshua Harlow <harlowja@yahoo-inc.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License version 3, as
+#    published by the Free Software Foundation.
+#
+#    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, see <http://www.gnu.org/licenses/>.
+
+
+# This is a util function to translate debian based distro interface blobs as
+# given in /etc/network/interfaces to an *somewhat* agnostic format for
+# distributions that use other formats.
+#
+# TODO(harlowja) remove when we have python-netcf active...
+def translate_network(settings):
+    # Get the standard cmd, args from the ubuntu format
+    entries = []
+    for line in settings.splitlines():
+        line = line.strip()
+        if not line or line.startswith("#"):
+            continue
+        split_up = line.split(None, 1)
+        if len(split_up) <= 1:
+            continue
+        entries.append(split_up)
+    # Figure out where each iface section is
+    ifaces = []
+    consume = {}
+    for (cmd, args) in entries:
+        if cmd == 'iface':
+            if consume:
+                ifaces.append(consume)
+                consume = {}
+            consume[cmd] = args
+        else:
+            consume[cmd] = args
+    # Check if anything left over to consume
+    absorb = False
+    for (cmd, args) in consume.iteritems():
+        if cmd == 'iface':
+            absorb = True
+    if absorb:
+        ifaces.append(consume)
+    # Now translate
+    real_ifaces = {}
+    for info in ifaces:
+        if 'iface' not in info:
+            continue
+        iface_details = info['iface'].split(None)
+        dev_name = None
+        if len(iface_details) >= 1:
+            dev = iface_details[0].strip().lower()
+            if dev:
+                dev_name = dev
+        if not dev_name:
+            continue
+        iface_info = {}
+        if len(iface_details) >= 3:
+            proto_type = iface_details[2].strip().lower()
+            # Seems like this can be 'loopback' which we don't
+            # really care about
+            if proto_type in ['dhcp', 'static']:
+                iface_info['bootproto'] = proto_type
+        # These can just be copied over
+        for k in ['netmask', 'address', 'gateway', 'broadcast']:
+            if k in info:
+                val = info[k].strip().lower()
+                if val:
+                    iface_info[k] = val
+        # Name server info provided??
+        if 'dns-nameservers' in info:
+            iface_info['dns-nameservers'] = info['dns-nameservers'].split()
+        # Name server search info provided??
+        if 'dns-search' in info:
+            iface_info['dns-search'] = info['dns-search'].split()
+        # Is any mac address spoofing going on??
+        if 'hwaddress' in info:
+            hw_info = info['hwaddress'].lower().strip()
+            hw_split = hw_info.split(None, 1)
+            if len(hw_split) == 2 and hw_split[0].startswith('ether'):
+                hw_addr = hw_split[1]
+                if hw_addr:
+                    iface_info['hwaddress'] = hw_addr
+        real_ifaces[dev_name] = iface_info
+    # Check for those that should be started on boot via 'auto'
+    for (cmd, args) in entries:
+        if cmd == 'auto':
+            # Seems like auto can be like 'auto eth0 eth0:1' so just get the
+            # first part out as the device name
+            args = args.split(None)
+            if not args:
+                continue
+            dev_name = args[0].strip().lower()
+            if dev_name in real_ifaces:
+                real_ifaces[dev_name]['auto'] = True
+    return real_ifaces