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iputil.get_local_ip_for: tolerate running on a disconnected host

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This commit is contained in:
Brian Warner 2007-06-07 19:23:33 -07:00
parent e04ff3adac
commit 2db17df833
1 changed files with 19 additions and 6 deletions
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25
src/allmydata/util/iputil.py
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@ -25,7 +25,9 @@ def get_local_addresses_async(target='A.ROOT-SERVERS.NET'):
reachable to.
"""
addresses = []
addresses.append(get_local_ip_for(target))
local_ip = get_local_ip_for(target)
if local_ip:
addresses.append(local_ip)
if sys.platform == "cygwin":
d = _cygwin_hack_find_addresses(target)
@ -44,14 +46,25 @@ def get_local_addresses_async(target='A.ROOT-SERVERS.NET'):
def get_local_ip_for(target):
"""Find out what our IP address is for use by a given target.
@returns: the IP address as a dotted-quad string which could be used by
'target' to connect to us. It might work for them, it might not
@returns:the IP address as a dotted-quad string which could be used by
to connect to us. It might work for them, it might not. If
there is no suitable address (perhaps we don't currently have an
externally-visible interface), this will return None.
"""
target_ipaddr = socket.gethostbyname(target)
try:
target_ipaddr = socket.gethostbyname(target)
except socket.gaierror:
# DNS isn't running
return None
udpprot = DatagramProtocol()
port = reactor.listenUDP(0, udpprot)
udpprot.transport.connect(target_ipaddr, 7)
localip = udpprot.transport.getHost().host
try:
udpprot.transport.connect(target_ipaddr, 7)
localip = udpprot.transport.getHost().host
except socket.error:
# no route to that host
localip = None
port.stopListening() # note, this returns a Deferred
return localip