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Make sure the netlink socket closes on the way out

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This commit is contained in:
Jarrod Johnson 2021-08-30 09:01:42 -04:00
parent 3d4462d788
commit aaea5bcaeb
1 changed files with 31 additions and 30 deletions
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61
confluent_server/confluent/neighutil.py
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@ -15,8 +15,6 @@
# limitations under the License.
# A consolidated manage of neighbor table information management.
# Ultimately, this should use AF_NETLINK, but in the interest of time,
# use ip neigh for the moment
import confluent.util as util
import os
@ -42,34 +40,37 @@ def _update_neigh():
ndmsg= b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
s.sendall(nlhdr + ndmsg)
neightable = {}
while True:
pdata = s.recv(65536)
v = memoryview(pdata)
if struct.unpack('H', v[4:6])[0] == 3:
break
while len(v):
length, typ = struct.unpack('IH', v[:6])
if typ == 28:
hlen = struct.calcsize('BIHBB')
_, idx, state, flags, typ = struct.unpack('BIHBB', v[16:16+hlen])
if typ == 1: # only handle unicast entries
curraddr = None
currip = None
rta = v[16+hlen:length]
while len(rta):
rtalen, rtatyp = struct.unpack('HH', rta[:4])
if rtatyp == 2: # hwaddr
curraddr = rta[4:rtalen].tobytes()
if len(curraddr) == 20:
curraddr = curraddr[12:]
elif rtatyp == 1: # ip address
currip = rta[4:rtalen].tobytes()
rta = rta[rtalen:]
if not rtalen:
break
if curraddr and currip:
neightable[currip] = curraddr
v = v[length:]
try:
while True:
pdata = s.recv(65536)
v = memoryview(pdata)
if struct.unpack('H', v[4:6])[0] == 3:
break
while len(v):
length, typ = struct.unpack('IH', v[:6])
if typ == 28:
hlen = struct.calcsize('BIHBB')
_, idx, state, flags, typ = struct.unpack('BIHBB', v[16:16+hlen])
if typ == 1: # only handle unicast entries
curraddr = None
currip = None
rta = v[16+hlen:length]
while len(rta):
rtalen, rtatyp = struct.unpack('HH', rta[:4])
if rtatyp == 2: # hwaddr
curraddr = rta[4:rtalen].tobytes()
if len(curraddr) == 20:
curraddr = curraddr[12:]
elif rtatyp == 1: # ip address
currip = rta[4:rtalen].tobytes()
rta = rta[rtalen:]
if not rtalen:
break
if curraddr and currip:
neightable[currip] = curraddr
v = v[length:]
finally:
s.close()
def get_hwaddr(ipaddr):