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Add mdns package and Client implementation (#55)

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* add mdns

* define mdns.Client

* fix some mdns stuff

* refine dns package for use with mdns

* remove Querier and Responder and replace with Client

* add record setting methods on dns.record to reuse record buffer

* protect against unbounded client answer growth

* round off sharp mdns edges; reduce allocs

* add mutlicast to stacks; add xnet tests for mdns

* fix documentation on acceptmulticast field

* mdns working
This commit is contained in:
Pat Whittingslow
2026-03-16 19:48:17 +01:00
committed by GitHub
parent 376e1a0b4f
commit bd645b5e1e
14 changed files with 1402 additions and 67 deletions
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x/xnet/stack-async.go
+32 -5
View File
@@ -46,6 +46,8 @@ type StackAsync struct {
ntpUDP internet.StackUDPPort
ntp ntp.Client
userUDPs []internet.StackUDPPort
sysprec int8 // NTP system precision.
prng uint32
@@ -60,12 +62,16 @@ type StackConfig struct {
StaticAddress netip.Addr
DNSServer netip.Addr
NTPServer netip.Addr
RandSeed int64
Hostname string
MaxTCPConns int
RandSeed int64
HardwareAddress [6]byte
MTU uint16
MaxUDPConns int
EthernetTxCRC32Update func(crc uint32, b []byte) uint32
HardwareAddress [6]byte
MTU uint16
// Accept multicast ethernet and IP packets. Needed for MDNS.
AcceptMulticast bool
}
func (s *StackAsync) Hostname() string {
@@ -120,18 +126,24 @@ func (s *StackAsync) Reset(cfg StackConfig) error {
if err != nil {
return err
}
s.link.SetAcceptMulticast(cfg.AcceptMulticast)
const ipNodes = 2 // UDP, TCP ports.
err = s.ip.Reset(addr, ipNodes)
if err != nil {
return err
}
s.ip.SetAcceptMulticast(cfg.AcceptMulticast)
//
err = s.resetARP()
if err != nil {
return err
}
const udpMaintenanceConns = 3 // DHCP, DNS, NTP.
err = s.udps.ResetUDP(udpMaintenanceConns)
udpConns := 3 + cfg.MaxUDPConns // DHCP, DNS, NTP + user-registered.
err = s.udps.ResetUDP(udpConns)
if err != nil {
return err
}
internal.SliceReuse(&s.userUDPs, cfg.MaxUDPConns)
if err != nil {
return err
}
@@ -322,6 +334,21 @@ func (s *StackAsync) RegisterListener(listener *tcp.Listener) (err error) {
return s.tcps.Register(listener, nil)
}
// RegisterUDP registers a StackNode on a UDP port with the given remote address and port.
// The StackUDPPort wrapping is handled internally. The number of user-registered UDP ports
// is limited by [StackConfig.MaxUDPConns].
func (s *StackAsync) RegisterUDP(node internet.StackNode, remoteAddr []byte, remotePort uint16) error {
s.mu.Lock()
defer s.mu.Unlock()
idx := len(s.userUDPs)
if idx >= cap(s.userUDPs) {
return lneto.ErrBufferFull
}
s.userUDPs = s.userUDPs[:idx+1]
s.userUDPs[idx].SetStackNode(node, remoteAddr, remotePort)
return s.udps.Register(&s.userUDPs[idx])
}
var errNoDNSServer = errors.New("no DNS server- did DHCP complete? You can set a predetermined DNS server in Stack configuration")
func (s *StackAsync) StartLookupIP(host string) error {