# Copyright (C) 2013-2014 Canonical Ltd. # # Author: Scott Moser # Author: Blake Rouse # # This file is part of cloud-init. See LICENSE file for license information. import base64 import glob import gzip import io from . import get_devicelist from . import read_sys_net_safe from cloudinit import util def _klibc_to_config_entry(content, mac_addrs=None): """Convert a klibc written shell content file to a 'config' entry When ip= is seen on the kernel command line in debian initramfs and networking is brought up, ipconfig will populate /run/net-.cfg. The files are shell style syntax, and examples are in the tests provided here. There is no good documentation on this unfortunately. DEVICE= is expected/required and PROTO should indicate if this is 'static' or 'dhcp' or 'dhcp6' (LP: #1621507). note that IPV6PROTO is also written by newer code to address the possibility of both ipv4 and ipv6 getting addresses. """ if mac_addrs is None: mac_addrs = {} data = util.load_shell_content(content) try: name = data['DEVICE'] if 'DEVICE' in data else data['DEVICE6'] except KeyError: raise ValueError("no 'DEVICE' or 'DEVICE6' entry in data") # ipconfig on precise does not write PROTO # IPv6 config gives us IPV6PROTO, not PROTO. proto = data.get('PROTO', data.get('IPV6PROTO')) if not proto: if data.get('filename'): proto = 'dhcp' else: proto = 'static' if proto not in ('static', 'dhcp', 'dhcp6'): raise ValueError("Unexpected value for PROTO: %s" % proto) iface = { 'type': 'physical', 'name': name, 'subnets': [], } if name in mac_addrs: iface['mac_address'] = mac_addrs[name] # Handle both IPv4 and IPv6 values for v, pre in (('ipv4', 'IPV4'), ('ipv6', 'IPV6')): # if no IPV4ADDR or IPV6ADDR, then go on. if pre + "ADDR" not in data: continue # PROTO for ipv4, IPV6PROTO for ipv6 cur_proto = data.get(pre + 'PROTO', proto) subnet = {'type': cur_proto, 'control': 'manual'} # only populate address for static types. While the rendered config # may have an address for dhcp, that is not really expected. if cur_proto == 'static': subnet['address'] = data[pre + 'ADDR'] # these fields go right on the subnet for key in ('NETMASK', 'BROADCAST', 'GATEWAY'): if pre + key in data: subnet[key.lower()] = data[pre + key] dns = [] # handle IPV4DNS0 or IPV6DNS0 for nskey in ('DNS0', 'DNS1'): ns = data.get(pre + nskey) # verify it has something other than 0.0.0.0 (or ipv6) if ns and len(ns.strip(":.0")): dns.append(data[pre + nskey]) if dns: subnet['dns_nameservers'] = dns # add search to both ipv4 and ipv6, as it has no namespace search = data.get('DOMAINSEARCH') if search: if ',' in search: subnet['dns_search'] = search.split(",") else: subnet['dns_search'] = search.split() iface['subnets'].append(subnet) return name, iface def config_from_klibc_net_cfg(files=None, mac_addrs=None): if files is None: files = glob.glob('/run/net-*.conf') + glob.glob('/run/net6-*.conf') entries = [] names = {} for cfg_file in files: name, entry = _klibc_to_config_entry(util.load_file(cfg_file), mac_addrs=mac_addrs) if name in names: prev = names[name]['entry'] if prev.get('mac_address') != entry.get('mac_address'): raise ValueError( "device '%s' was defined multiple times (%s)" " but had differing mac addresses: %s -> %s.", (name, ' '.join(names[name]['files']), prev.get('mac_address'), entry.get('mac_address'))) prev['subnets'].extend(entry['subnets']) names[name]['files'].append(cfg_file) else: names[name] = {'files': [cfg_file], 'entry': entry} entries.append(entry) return {'config': entries, 'version': 1} def _decomp_gzip(blob, strict=True): # decompress blob. raise exception if not compressed unless strict=False. with io.BytesIO(blob) as iobuf: gzfp = None try: gzfp = gzip.GzipFile(mode="rb", fileobj=iobuf) return gzfp.read() except IOError: if strict: raise return blob finally: if gzfp: gzfp.close() def _b64dgz(b64str, gzipped="try"): # decode a base64 string. If gzipped is true, transparently uncompresss # if gzipped is 'try', then try gunzip, returning the original on fail. try: blob = base64.b64decode(b64str) except TypeError: raise ValueError("Invalid base64 text: %s" % b64str) if not gzipped: return blob return _decomp_gzip(blob, strict=gzipped != "try") def read_kernel_cmdline_config(files=None, mac_addrs=None, cmdline=None): if cmdline is None: cmdline = util.get_cmdline() if 'network-config=' in cmdline: data64 = None for tok in cmdline.split(): if tok.startswith("network-config="): data64 = tok.split("=", 1)[1] if data64: return util.load_yaml(_b64dgz(data64)) if 'ip=' not in cmdline and 'ip6=' not in cmdline: return None if mac_addrs is None: mac_addrs = {} for k in get_devicelist(): mac_addr = read_sys_net_safe(k, 'address') if mac_addr: mac_addrs[k] = mac_addr return config_from_klibc_net_cfg(files=files, mac_addrs=mac_addrs) # vi: ts=4 expandtab