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[caclmgrd] Get first VLAN host IP address via next() (#4685)

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I found that with IPv4Network types, calling list(ip_ntwrk.hosts()) is reliable. However, when doing the same with an IPv6Network, I found that the conversion to a list can hang indefinitely. This appears to me to be a bug in the ipaddress.IPv6Network implementation. However, I could not find any other reports on the web.

This patch changes the behavior to call next() on the ip_ntwrk.hosts() generator instead, which returns the IP address of the first host.
This commit is contained in:
Joe LeVeque 2020-06-02 02:11:21 -07:00 committed by Ying Xie
parent c587f3c4d5
commit 7ae30d7898
1 changed files with 3 additions and 2 deletions
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files/image_config/caclmgrd/caclmgrd
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@ -180,10 +180,11 @@ class ControlPlaneAclManager(object):
continue
iface_name, iface_cidr = key
ip_ntwrk = ipaddress.ip_network(iface_cidr, strict=False)
first_host = next(ip_ntwrk.hosts())
if isinstance(ip_ntwrk, ipaddress.IPv4Network):
block_ip2me_cmds.append("iptables -A INPUT -d {}/{} -j DROP".format(list(ip_ntwrk.hosts())[0], ip_ntwrk.max_prefixlen))
block_ip2me_cmds.append("iptables -A INPUT -d {}/{} -j DROP".format(first_host, ip_ntwrk.max_prefixlen))
elif isinstance(ip_ntwrk, ipaddress.IPv6Network):
block_ip2me_cmds.append("ip6tables -A INPUT -d {}/{} -j DROP".format(list(ip_ntwrk.hosts())[0], ip_ntwrk.max_prefixlen))
block_ip2me_cmds.append("ip6tables -A INPUT -d {}/{} -j DROP".format(first_host, ip_ntwrk.max_prefixlen))
else:
log_warning("Unrecognized IP address type on interface '{}': {}".format(iface_name, ip_ntwrk))