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Bob Halley
1999-03-26 23:15:26 +00:00
parent 2488942fbb
commit 88f1e866aa
1 changed files with 17 additions and 13 deletions
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doc/design/search
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@@ -31,6 +31,7 @@ desired name. In a zone, it's either a delegation out of authoritative
data, or it's the top of the zone.
ZC == "zone cut", a node not at the zone top which has an active NS
rdataset, or a node (including the zone top) with an active DNAME
rdataset.
@@ -144,7 +145,7 @@ Zone Search Algorithm
query, any active rdataset.
If we're beneath a zone cut
cname ok = no
cname_ok = no
If the caller wants us to validate glue, then see if the
current name is a valid glue name for the ZC.
If not,
@@ -154,6 +155,9 @@ Zone Search Algorithm
rdataset = NS
return
If the desired type is KEY, SIG, or NXT, then
cname_ok = no
foundname = current node name
*nodep = current node;
@@ -162,11 +166,6 @@ Zone Search Algorithm
is if there is *some* active rdataset at this node. While searching,
remember the active NXT rdataset if we come across it.
If type is ANY and there's at least one active rdataset
result = DNS_R_SUCCESS
rdataset = <unbound>
return
If we didn't find the type we were looking for (including a failed
ANY search)
If (search_must_succeed), then
@@ -174,9 +173,6 @@ Zone Search Algorithm
result = DNS_R_BADDB
*nodep = NULL
foundname = <empty>
Else If we did find a CNAME, then
result = DNS_R_CNAME
rdataset = CNAME
Else if we're beneath a zone cut
result = DNS_R_DELEGATION
foundname = ZC name
@@ -195,13 +191,21 @@ Zone Search Algorithm
rdataset = <unbound>
return
Amazingly, we have found the type we were looking for!
We have found the type we were looking for or we've found a CNAME.
If we're beneath a zone cut
If we're not doing any ANY query, didn't find the type we were looking
for, but did find a CNAME
result = DNS_R_CNAME
rdataset = CNAME
Else If we're beneath a zone cut
result = DNS_R_GLUE
else
Else
result = DNS_R_SUCCESS
rdataset = the type we were looking for
If type is ANY
rdataset = <unbound>
else
rdataset = the type we were looking for