gilles/Strix
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Switch mDNS probe to multicast, use mDNS for reachability

Browse Source 
Unicast mDNS queries (direct to IP:5353) are ignored by some HomeKit
devices. Switch to multicast (224.0.0.251:5353) and filter responses
by sender IP. Also consider mDNS response as reachability signal.

Split probe timeouts: 100ms for ports/DNS/HTTP, 120ms total to give
mDNS extra time. HomeKit responds in ~0.2ms via multicast.
This commit is contained in:
eduard256
2026-04-05 12:06:11 +00:00
parent f084135701
commit e2e24c7578
2 changed files with 34 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files
internal/probe/probe.go
+9 -5
View File
@@ -16,7 +16,7 @@ import (
_ "modernc.org/sqlite"
)
const probeTimeout = 100 * time.Millisecond
const probeTimeout = 120 * time.Millisecond
var log zerolog.Logger
var db *sql.DB
@@ -78,14 +78,17 @@ func runProbe(parent context.Context, ip string) *probe.Response {
}()
}
fastCtx, fastCancel := context.WithTimeout(ctx, 100*time.Millisecond)
defer fastCancel()
run(func() {
r, _ := probe.ScanPorts(ctx, ip, ports)
r, _ := probe.ScanPorts(fastCtx, ip, ports)
mu.Lock()
resp.Probes.Ports = r
mu.Unlock()
})
run(func() {
r, _ := probe.ReverseDNS(ctx, ip)
r, _ := probe.ReverseDNS(fastCtx, ip)
mu.Lock()
resp.Probes.DNS = r
mu.Unlock()
@@ -107,7 +110,7 @@ func runProbe(parent context.Context, ip string) *probe.Response {
mu.Unlock()
})
run(func() {
r, _ := probe.ProbeHTTP(ctx, ip, nil)
r, _ := probe.ProbeHTTP(fastCtx, ip, nil)
mu.Lock()
resp.Probes.HTTP = r
mu.Unlock()
@@ -116,7 +119,8 @@ func runProbe(parent context.Context, ip string) *probe.Response {
wg.Wait()
// determine reachable
resp.Reachable = resp.Probes.Ports != nil && len(resp.Probes.Ports.Open) > 0
resp.Reachable = (resp.Probes.Ports != nil && len(resp.Probes.Ports.Open) > 0) ||
resp.Probes.MDNS != nil
// determine type
resp.Type = "standard"