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dns: auto-delete incorrect SRV entries for our hostname

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This commit is contained in:
Andrew Tridgell 2010-02-26 13:58:32 +11:00
parent ab4f170216
commit 721bcfa01c
1 changed files with 15 additions and 8 deletions
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23
source4/scripting/bin/samba_dnsupdate
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@ -94,6 +94,8 @@ class dnsobj(object):
self.dest = None
self.port = None
self.ip = None
self.existing_port = None
self.existing_weight = None
def __str__(self):
if d.type == "A": return "%s:%s:%s" % (self.type, self.name, self.ip)
if d.type == "SRV": return "%s:%s:%s:%s" % (self.type, self.name, self.dest, self.port)
@ -131,10 +133,11 @@ def hostname_match(h1, h2):
############################################
# check that a DNS entry exists
def check_dns_name(d):
normalised_name = d.name.rstrip('.') + '.'
if opts.verbose:
print "Looking for DNS entry %s" % d
print "Looking for DNS entry %s as %s" % (d, normalised_name)
try:
ans = dns.resolver.query(d.name, d.type)
ans = dns.resolver.query(normalised_name, d.type)
except dns.resolver.NXDOMAIN:
return False
if d.type == 'A':
@ -147,14 +150,15 @@ def check_dns_name(d):
if hostname_match(ans[i].target, d.dest):
return True
if d.type == 'SRV':
if opts.verbose:
print "Got %u replies in SRV lookup for %s" % (len(ans), d.name)
for i in range(len(ans)):
rdata = ans[i]
for rdata in ans:
if opts.verbose:
print "Checking %s against %s" % (rdata, d)
if str(rdata.port) == str(d.port) and hostname_match(rdata.target, d.dest):
return True
if hostname_match(rdata.target, d.dest):
if str(rdata.port) == str(d.port):
return True
else:
d.existing_port = str(rdata.port)
d.existing_weight = str(rdata.weight)
if opts.verbose:
print "Failed to find DNS entry %s" % d
return False
@ -190,6 +194,9 @@ def call_nsupdate(d):
if d.type == "A":
f.write("update add %s %u A %s\n" % (d.name, default_ttl, d.ip))
if d.type == "SRV":
if d.existing_port is not None:
f.write("update delete %s SRV 0 %s %s %s\n" % (d.name, d.existing_weight,
d.existing_port, d.dest))
f.write("update add %s %u SRV 0 100 %s %s\n" % (d.name, default_ttl, d.port, d.dest))
if d.type == "CNAME":
f.write("update add %s %u SRV %s\n" % (d.name, default_ttl, d.dest))