handle possibly missing IPv6 support

2 files changed, 12 insertions, 1 deletions

diff --git a/pysnmp/carrier/asyncore/base.py b/pysnmp/carrier/asyncore/base.py
index 144e9769..36e1008a 100644
--- a/pysnmp/carrier/asyncore/base.py
+++ b/pysnmp/carrier/asyncore/base.py
@@ -12,6 +12,14 @@ class AbstractSocketTransport(asyncore.dispatcher):
     retryCount = 0; retryInterval = 0
     def __init__(self, sock=None, sockMap=None):
         if sock is None:
+            if self.sockFamily is None:
+                raise error.CarrierError(
+                    'Address family %s not supported' % self.__class__.__name__
+                    )
+            if self.sockType is None:
+                raise error.CarrierError(
+                    'Socket type %s not supported' % self.__class__.__name__
+                    )
             try:
                 sock = socket.socket(self.sockFamily, self.sockType)
             except socket.error, why:
diff --git a/pysnmp/carrier/asyncore/dgram/udp6.py b/pysnmp/carrier/asyncore/dgram/udp6.py
index b0b3f9b6..e9b0315c 100644
--- a/pysnmp/carrier/asyncore/dgram/udp6.py
+++ b/pysnmp/carrier/asyncore/dgram/udp6.py
@@ -1,5 +1,8 @@
 """Implements asyncore-based UDP6 transport domain"""
-from socket import AF_INET6
+try:
+    from socket import AF_INET6
+except:
+    AF_INET6 = None
 from pysnmp.carrier.asynsock.dgram.base import DgramSocketTransport
 
 domainName = snmpUDP6Domain = (1, 3, 6, 1, 2, 1, 100, 1, 2)