def assign_ipv4_link_local(nic=None):
"""Bring up NIC using an address using link-local (ip4LL) IPs. On
DigitalOcean, the link-local domain is per-droplet routed, so there
is no risk of collisions. However, to be more safe, the ip4LL
address is random.
"""
if not nic:
for cdev in sorted(cloudnet.get_devicelist()):
if cloudnet.is_physical(cdev):
nic = cdev
LOG.debug("assigned nic '%s' for link-local discovery", nic)
break
if not nic:
raise RuntimeError("unable to find interfaces to access the"
"meta-data server. This droplet is broken.")
addr = "169.254.{0}.{1}/16".format(random.randint(1, 168),
random.randint(0, 255))
ip_addr_cmd = ['ip', 'addr', 'add', addr, 'dev', nic]
ip_link_cmd = ['ip', 'link', 'set', 'dev', nic, 'up']
if not util.which('ip'):
raise RuntimeError("No 'ip' command available to configure ip4LL "
"address")
try:
(result, _err) = util.subp(ip_addr_cmd)
LOG.debug("assigned ip4LL address '%s' to '%s'", addr, nic)
(result, _err) = util.subp(ip_link_cmd)
LOG.debug("brought device '%s' up", nic)
except Exception:
util.logexc(
LOG, "ip4LL address assignment of '%s' to '%s' failed."
" Droplet networking will be broken", addr, nic)
raise
return nic
def assign_ipv4_link_local(nic=None):
"""Bring up NIC using an address using link-local (ip4LL) IPs. On
DigitalOcean, the link-local domain is per-droplet routed, so there
is no risk of collisions. However, to be more safe, the ip4LL
address is random.
"""
if not nic:
for cdev in sorted(cloudnet.get_devicelist()):
if cloudnet.is_physical(cdev):
nic = cdev
LOG.debug("assigned nic '%s' for link-local discovery", nic)
break
if not nic:
raise RuntimeError("unable to find interfaces to access the"
"meta-data server. This droplet is broken.")
addr = "169.254.{0}.{1}/16".format(random.randint(1, 168),
random.randint(0, 255))
ip_addr_cmd = ['ip', 'addr', 'add', addr, 'dev', nic]
ip_link_cmd = ['ip', 'link', 'set', 'dev', nic, 'up']
if not util.which('ip'):
raise RuntimeError("No 'ip' command available to configure ip4LL "
"address")
try:
(result, _err) = util.subp(ip_addr_cmd)
LOG.debug("assigned ip4LL address '%s' to '%s'", addr, nic)
(result, _err) = util.subp(ip_link_cmd)
LOG.debug("brought device '%s' up", nic)
except Exception:
util.logexc(LOG, "ip4LL address assignment of '%s' to '%s' failed."
" Droplet networking will be broken", addr, nic)
raise
return nic
def test_is_physical(self):
"""is_physical is True when /sys/net/devname/device exists."""
self.assertFalse(net.is_physical('eth0'))
ensure_file(os.path.join(self.sysdir, 'eth0', 'device'))
self.assertTrue(net.is_physical('eth0'))
def get_physical_nics_by_mac():
devs = net.get_interfaces_by_mac()
return dict([(m, n) for m, n in devs.items() if net.is_physical(n)])
def get_link_local_nic():
nics = [f for f in cloudnet.get_devicelist() if cloudnet.is_physical(f)]
if not nics:
return None
return min(nics, key=lambda d: cloudnet.read_sys_net_int(d, 'ifindex'))
def is_physical(self, devname: DeviceName) -> bool:
return net.is_physical(devname)
def test_is_physical(self):
"""is_physical is True when /sys/net/devname/device exists."""
self.assertFalse(net.is_physical('eth0'))
ensure_file(os.path.join(self.sysdir, 'eth0', 'device'))
self.assertTrue(net.is_physical('eth0'))
def get_link_local_nic():
nics = [f for f in cloudnet.get_devicelist() if cloudnet.is_physical(f)]
if not nics:
return None
return min(nics, key=lambda d: cloudnet.read_sys_net_int(d, 'ifindex'))
def get_first_physical_interface():
devs = [f for f in cloudnet.get_devicelist() if cloudnet.is_physical(f)]
if not devs:
raise RuntimeError("No interfaces find to configure link-local address")
return min(devs, key=lambda d: cloudnet.read_sys_net_int(d, 'ifindex'))
