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plugin/view: Advanced routing interface and new 'view' plugin (#5538)

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* introduce new interface "dnsserver.Viewer", that allows a plugin implementing it to decide if a query should be routed into its server block.
* add new plugin "view", that uses the new interface to enable a user to define expression based conditions that must be met for a query to be routed to its server block.

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
This commit is contained in:
Chris O'Haver
2022-09-08 14:56:27 -04:00
committed by GitHub
parent 1f0a41a665
commit b56b080a7c
36 changed files with 880 additions and 114 deletions
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23
core/dnsserver/address.go
View File

@@ -49,11 +49,23 @@ func newOverlapZone() *zoneOverlap {
// registerAndCheck adds a new zoneAddr for validation, it returns information about existing or overlapping with already registered
// we consider that an unbound address is overlapping all bound addresses for same zone, same port
func (zo *zoneOverlap) registerAndCheck(z zoneAddr) (existingZone *zoneAddr, overlappingZone *zoneAddr) {
existingZone, overlappingZone = zo.check(z)
if existingZone != nil || overlappingZone != nil {
return existingZone, overlappingZone
}
// there is no overlap, keep the current zoneAddr for future checks
zo.registeredAddr[z] = z
zo.unboundOverlap[z.unbound()] = z
return nil, nil
}
// check validates a zoneAddr for overlap without registering it
func (zo *zoneOverlap) check(z zoneAddr) (existingZone *zoneAddr, overlappingZone *zoneAddr) {
if exist, ok := zo.registeredAddr[z]; ok {
// exact same zone already registered
return &exist, nil
}
uz := zoneAddr{Zone: z.Zone, Address: "", Port: z.Port, Transport: z.Transport}
uz := z.unbound()
if already, ok := zo.unboundOverlap[uz]; ok {
if z.Address == "" {
// current is not bound to an address, but there is already another zone with a bind address registered
@@ -64,8 +76,11 @@ func (zo *zoneOverlap) registerAndCheck(z zoneAddr) (existingZone *zoneAddr, ove
return nil, &uz
}
}
// there is no overlap, keep the current zoneAddr for future checks
zo.registeredAddr[z] = z
zo.unboundOverlap[uz] = z
// there is no overlap
return nil, nil
}
// unbound returns an unbound version of the zoneAddr
func (z zoneAddr) unbound() zoneAddr {
return zoneAddr{Zone: z.Zone, Address: "", Port: z.Port, Transport: z.Transport}
}