internal/checker+gui: remove voice-srv test (Discord doesn't expose regional voice servers via public DNS)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/superpowers/specs/2026-05-01-checker-design.md

@@ -56,11 +56,6 @@ type Config struct {
     // voice-quality burst tuning
     VoiceBurstCount    int           // default 30
     VoiceBurstInterval time.Duration // default 20ms
-
-    // voice-srv probe — empty list means "use the built-in default
-    // (russia/russia2/frankfurt/europe/singapore/japan/us-east/us-west/
-    // brazil/india/hongkong/southkorea/sydney/southafrica/dubai/atlanta).discord.media"
-    VoiceServerHostnames []string
 }
 
 // StatusWarn is a "soft pass" — the test technically succeeded but
@@ -93,7 +88,6 @@ Sequential. Each test reuses sockets opened by previous tests when sensible.
 | `connect` | SOCKS5 CONNECT to `gateway.discord.gg:443` (ATYP=03 domain). Reads 10 bytes. Pass = REP=0x00. | REP != 0 (0x05 = connection refused, etc) / timeout | skipped if `greet`/`auth` failed |
 | `udp` | UDP ASSOCIATE: opens **second** TCP control channel, redoes greeting+auth there, sends `05 03 00 01 00000000 0000`, reads 10-byte reply. Pass = REP=0x00 + valid relay endpoint in BND.ADDR/BND.PORT. | REP=0x07 (cmd unsupported), other REP, short read | skipped if `greet` failed |
 | `voice-quality` | Through the relay: send `VoiceBurstCount` (default 30) STUN binding requests to `cfg.StunServer`, spaced `VoiceBurstInterval` (default 20ms). Listen until `last_send + 1.5*PerTestTimeout`. Compute `loss%`, `jitter` (mean abs delta of inter-arrival deltas, à la RFC 3550 simplified), `p50 RTT`. Metric = `"loss=2% jitter=14ms p50=42ms"`. **Pass** = loss ≤ 5% AND jitter ≤ 30ms AND p50 ≤ 250ms. **Warn-pass** (status=passed but Hint set) = loss ≤ 15% AND jitter ≤ 60ms — voice will work with audible glitches. **Fail** = anything worse. | loss > 15% OR jitter > 60ms OR p50 > 400ms OR no replies at all | skipped if `udp` failed |
-| `voice-srv` | Probe Discord voice servers. Concurrently DNS-resolve a hardcoded list of `<region>.discord.media` hostnames (`russia`, `russia2`, `frankfurt`, `europe`, `singapore`, `japan`, `us-east`, `us-west`, `brazil`, `india`, `hongkong`, `southkorea`, `sydney`, `southafrica`, `dubai`, `atlanta`) using OS resolver, 2s budget. For every resolved hostname: SOCKS5 CONNECT through proxy to `host:443` with 1s dial timeout, run them concurrently with a small worker pool (8). Metric = `"<N> regions reachable: russia, frankfurt, europe"` (top 3). **Pass** = ≥ 1 region reachable. **Warn-pass** = 0 reachable but ≥ 1 resolved (proxy filters Discord media IPs even though DNS works) — Hint will warn that voice may not work despite checks 1-5 passing. **Fail** = 0 hostnames resolved at all (DNS broken or Discord changed naming) | 0 hostnames resolved at all | skipped if `connect` failed |
 | `api` | TCP CONNECT through the proxy to `discord.com:443`, do a tiny HTTPS GET `/api/v9/gateway`. Pass = HTTP 200 or 401 (Discord returns 401 unauthenticated, that still proves reachability). | non-200/401 / TLS handshake failed / connect refused | skipped if `connect` failed |
 
 For each fail, the `Hint` field carries a Russian explanation (the GUI is

internal/checker/checker.go

@@ -8,7 +8,6 @@ import (
 	"net/http"
 	"regexp"
 	"strconv"
-	"strings"
 	"time"
 )
 
@@ -63,13 +62,6 @@ type Config struct {
 	// packets, 20ms between sends.
 	VoiceBurstCount    int
 	VoiceBurstInterval time.Duration
-
-	// VoiceServerHostnames is the list of Discord voice-domain hostnames
-	// probed in the voice-srv test. Empty means "use the built-in 16-region
-	// default" (russia, russia2, frankfurt, europe, singapore, japan,
-	// us-east, us-west, brazil, india, hongkong, southkorea, sydney,
-	// southafrica, dubai, atlanta — all under .discord.media).
-	VoiceServerHostnames []string
 }
 
 // applyDefaults returns a copy of cfg with zero-valued knobs filled in.
@@ -107,9 +99,6 @@ func applyDefaults(cfg Config) Config {
 	if cfg.VoiceBurstInterval <= 0 {
 		cfg.VoiceBurstInterval = 20 * time.Millisecond
 	}
-	if len(cfg.VoiceServerHostnames) == 0 {
-		cfg.VoiceServerHostnames = defaultVoiceHostnames
-	}
 	return cfg
 }
 
@@ -135,7 +124,6 @@ func Run(ctx context.Context, cfg Config) <-chan Result {
 		e.runConnect()
 		e.runUDP()
 		e.runVoiceQuality()
-		e.runVoiceSrv()
 		e.runAPI()
 	}()
 
@@ -165,7 +153,7 @@ type executor struct {
 	udpClient net.PacketConn
 
 	// Step gating: each xOK is set true on success (or "soft pass"
-	// warn for voice-quality / voice-srv).
+	// warn for voice-quality).
 	tcpOK, greetOK, authOK, connectOK, udpOK, voiceQualityOK bool
 
 	// Cancellation latch. Once any test emits a "cancelled" failure,
@@ -761,97 +749,6 @@ func (e *executor) runVoiceQuality() {
 	}
 }
 
-// runVoiceSrv — Test 7: probe Discord voice-domain reachability through
-// the SOCKS5 proxy. Single attempt (DNS+connect bursts are slow and
-// idempotent — retry budget better spent on transient handshake steps).
-func (e *executor) runVoiceSrv() {
-	if e.shouldSkip("voice-srv", e.connectOK) {
-		return
-	}
-
-	attempt := 1
-	e.emit(Result{ID: "voice-srv", Status: StatusRunning, Attempt: attempt})
-	attemptCtx, cancel := context.WithTimeout(e.ctx, e.cfg.PerTestTimeout)
-	defer cancel()
-	start := time.Now()
-
-	// Per-host dial timeout — fits inside PerTestTimeout but isn't the
-	// whole budget (we run 8 in parallel, so total wall-clock is roughly
-	// ceil(N/8) * dialTimeout + DNS).
-	dialTimeout := e.cfg.PerTestTimeout / 4
-	if dialTimeout < 500*time.Millisecond {
-		dialTimeout = 500 * time.Millisecond
-	}
-
-	res, err := runVoiceServerProbe(
-		attemptCtx, e.cfg.VoiceServerHostnames, e.proxyAddr(),
-		e.cfg.UseAuth, e.cfg.ProxyLogin, e.cfg.ProxyPassword, dialTimeout,
-	)
-	dur := time.Since(start)
-
-	if err != nil {
-		if e.ctx.Err() != nil {
-			e.emitCancelled("voice-srv", attempt, dur)
-			return
-		}
-		e.emit(Result{
-			ID:       "voice-srv",
-			Status:   StatusFailed,
-			Error:    err.Error(),
-			Hint:     hintFor("voice-srv", err),
-			Attempt:  attempt,
-			Duration: dur,
-		})
-		return
-	}
-
-	if len(res.Resolved) == 0 {
-		e.emit(Result{
-			ID:       "voice-srv",
-			Status:   StatusFailed,
-			Error:    "no Discord voice domain resolved",
-			Hint:     "DNS не возвращает A-записи для *.discord.media — проверь системный DNS.",
-			Attempt:  attempt,
-			Duration: dur,
-		})
-		return
-	}
-
-	if len(res.Reachable) == 0 {
-		e.emit(Result{
-			ID:       "voice-srv",
-			Status:   StatusWarn,
-			Metric:   fmt.Sprintf("0/%d regions reachable", len(res.Resolved)),
-			Hint:     "Discord voice-домены резолвятся, но прокси не пропускает к ним TCP — голос с большой вероятностью не заработает.",
-			Attempt:  attempt,
-			Duration: dur,
-		})
-		return
-	}
-
-	// Top-3 region prefixes for the metric line.
-	top := res.Reachable
-	if len(top) > 3 {
-		top = top[:3]
-	}
-	prefixes := make([]string, 0, len(top))
-	for _, h := range top {
-		prefix := h
-		if i := strings.Index(h, ".discord.media"); i > 0 {
-			prefix = h[:i]
-		}
-		prefixes = append(prefixes, prefix)
-	}
-	metric := fmt.Sprintf("%d/%d regions: %s", len(res.Reachable), len(res.Resolved), strings.Join(prefixes, ", "))
-	e.emit(Result{
-		ID:       "voice-srv",
-		Status:   StatusPassed,
-		Metric:   metric,
-		Attempt:  attempt,
-		Duration: dur,
-	})
-}
-
 // runAPI — Test 7: HTTP GET Discord API gateway URL through the proxy.
 func (e *executor) runAPI() {
 	if e.shouldSkip("api", e.connectOK) {

internal/checker/checker_test.go

@@ -48,11 +48,6 @@ type fakeProxy struct {
 	apiTargetPort uint16
 	apiTargetAddr string
 
-	// blockVoiceCONNECT, when true, makes any CONNECT to a hostname
-	// not equal to apiTargetHost return REP=05. Used by voice-srv
-	// negative scenarios.
-	blockVoiceCONNECT atomic.Bool
-
 	// timeoutFirstAttempt stalls the first connection on greet to
 	// drive a timeout. Subsequent connections behave normally.
 	timeoutFirstAttempt atomic.Int32
@@ -96,7 +91,7 @@ func newFakeProxy(t *testing.T, scenario string) *fakeProxy {
 func needsUDPRelay(scenario string) bool {
 	switch scenario {
 	case "happy_no_auth", "happy_with_auth", "udp_unsupported", "connect_refused", "timeout_then_ok",
-		"voice_quality_warn", "voice_quality_fail", "voice_srv_blocked":
+		"voice_quality_warn", "voice_quality_fail":
 		return true
 	default:
 		return false
@@ -196,23 +191,6 @@ func (fp *fakeProxy) handle(conn net.Conn) {
 
 	switch cmdReq.cmd {
 	case 0x01: // CONNECT
-		// voice-srv block: refuse CONNECT to anything that isn't the
-		// gateway/api passthrough target. Only checked when the test
-		// explicitly sets blockVoiceCONNECT — keeps gateway+api happy.
-		if fp.blockVoiceCONNECT.Load() {
-			isAPITarget := fp.apiTargetHost != "" && cmdReq.host == fp.apiTargetHost && cmdReq.port == fp.apiTargetPort
-			isGatewayTarget := cmdReq.port == 443 && (cmdReq.host == "127.0.0.1" || cmdReq.host == "localhost") && fp.apiTargetHost == ""
-			_ = isGatewayTarget
-			if !isAPITarget {
-				// Refuse only :443 voice probes; allow gateway probe
-				// (which has its own configured port from stubGatewayAddr,
-				// not 443). Logic: target port == 443 → voice probe → refuse.
-				if cmdReq.port == 443 {
-					_, _ = conn.Write([]byte{0x05, 0x05, 0x00, 0x01, 0, 0, 0, 0, 0, 0})
-					return
-				}
-			}
-		}
 		switch fp.scenario {
 		case "connect_refused":
 			_, _ = conn.Write([]byte{0x05, 0x05, 0x00, 0x01, 0, 0, 0, 0, 0, 0})
@@ -517,13 +495,6 @@ func hostPort(addr string) (string, int) {
 
 // proxyConfig builds a Config pointed at the given fakeProxy with sane
 // short timeouts for tests.
-//
-// Note on voice-srv: the default Config.VoiceServerHostnames would hit
-// real Discord DNS during go test — we don't want that. Override with a
-// single local hostname ("localhost") so DNS always resolves to 127.0.0.1
-// and the SOCKS5 CONNECT goes back to the fake proxy itself, which
-// returns REP=00 on a happy CONNECT or REP=05 when blockVoiceCONNECT is
-// flipped.
 func proxyConfig(fp *fakeProxy, useAuth bool) Config {
 	host, port := hostPort(fp.addr)
 	cfg := Config{
@@ -535,7 +506,6 @@ func proxyConfig(fp *fakeProxy, useAuth bool) Config {
 		RetryBackoff:       30 * time.Millisecond,
 		VoiceBurstCount:    10,
 		VoiceBurstInterval: 5 * time.Millisecond,
-		VoiceServerHostnames: []string{"localhost"},
 	}
 	if useAuth {
 		cfg.ProxyLogin = "u"
@@ -609,7 +579,7 @@ func TestRun_HappyNoAuth(t *testing.T) {
 	ch := Run(context.Background(), cfg)
 	results := drainResults(t, ch, 10*time.Second)
 
-	expected := []string{"tcp", "greet", "connect", "udp", "voice-quality", "voice-srv", "api"}
+	expected := []string{"tcp", "greet", "connect", "udp", "voice-quality", "api"}
 	finals := map[string]Result{}
 	for _, id := range expected {
 		r, ok := finalByID(results, id)
@@ -629,7 +599,6 @@ func TestRun_HappyNoAuth(t *testing.T) {
 	assert.Contains(t, finals["greet"].Metric, "no auth")
 	assert.Equal(t, "REP=00", finals["connect"].Metric)
 	assert.Contains(t, finals["voice-quality"].Metric, "loss=")
-	assert.Contains(t, finals["voice-srv"].Metric, "1/1 regions")
 	assert.Equal(t, "HTTP 200", finals["api"].Metric)
 }
 
@@ -643,7 +612,7 @@ func TestRun_HappyWithAuth(t *testing.T) {
 	ch := Run(context.Background(), cfg)
 	results := drainResults(t, ch, 10*time.Second)
 
-	expected := []string{"tcp", "greet", "auth", "connect", "udp", "voice-quality", "voice-srv", "api"}
+	expected := []string{"tcp", "greet", "auth", "connect", "udp", "voice-quality", "api"}
 	for _, id := range expected {
 		r, ok := finalByID(results, id)
 		require.True(t, ok, "missing %s; results=%+v", id, results)
@@ -674,7 +643,7 @@ func TestRun_AuthRejected(t *testing.T) {
 	assert.Equal(t, StatusFailed, rA.Status)
 	assert.NotEmpty(t, rA.Hint)
 
-	for _, id := range []string{"connect", "udp", "voice-quality", "voice-srv", "api"} {
+	for _, id := range []string{"connect", "udp", "voice-quality", "api"} {
 		r, ok := finalByID(results, id)
 		require.True(t, ok, "missing %s", id)
 		assert.Equal(t, StatusSkipped, r.Status, "id=%s", id)
@@ -699,7 +668,7 @@ func TestRun_AllMethodsRejected(t *testing.T) {
 	assert.Equal(t, StatusFailed, rG.Status)
 	assert.NotEmpty(t, rG.Hint)
 
-	for _, id := range []string{"connect", "udp", "voice-quality", "voice-srv", "api"} {
+	for _, id := range []string{"connect", "udp", "voice-quality", "api"} {
 		r, ok := finalByID(results, id)
 		require.True(t, ok, "missing %s", id)
 		assert.Equal(t, StatusSkipped, r.Status, "id=%s", id)
@@ -735,10 +704,6 @@ func TestRun_ConnectRefused(t *testing.T) {
 	rVQ, _ := finalByID(results, "voice-quality")
 	assert.Equal(t, StatusPassed, rVQ.Status)
 
-	// voice-srv depends on connect → skipped.
-	rVS, _ := finalByID(results, "voice-srv")
-	assert.Equal(t, StatusSkipped, rVS.Status)
-
 	// api depends on connect → skipped.
 	rA, _ := finalByID(results, "api")
 	assert.Equal(t, StatusSkipped, rA.Status)
@@ -767,10 +732,6 @@ func TestRun_UDPUnsupported(t *testing.T) {
 	rVQ, _ := finalByID(results, "voice-quality")
 	assert.Equal(t, StatusSkipped, rVQ.Status)
 
-	// voice-srv depends on connect (passed) → runs and passes.
-	rVS, _ := finalByID(results, "voice-srv")
-	assert.Equal(t, StatusPassed, rVS.Status)
-
 	rA, _ := finalByID(results, "api")
 	assert.Equal(t, StatusPassed, rA.Status)
 }
@@ -806,8 +767,8 @@ func TestRun_TimeoutThenOK(t *testing.T) {
 	assert.Equal(t, StatusPassed, greetEvents[3].Status)
 	assert.Equal(t, 2, greetEvents[3].Attempt)
 
-	// All seven non-auth tests should ultimately pass.
-	for _, id := range []string{"tcp", "greet", "connect", "udp", "voice-quality", "voice-srv", "api"} {
+	// All non-auth tests should ultimately pass.
+	for _, id := range []string{"tcp", "greet", "connect", "udp", "voice-quality", "api"} {
 		r, ok := finalByID(results, id)
 		require.True(t, ok, "missing %s", id)
 		assert.Equal(t, StatusPassed, r.Status, "id=%s, got %+v", id, r)
@@ -873,10 +834,10 @@ func TestRun_CancelledMidFlight(t *testing.T) {
 	// Either: one cancelled-failed + rest cancelled-skipped, OR all
 	// cancelled-skipped (if cancellation hit before next test even
 	// started). Both are acceptable.
-	// Without auth, 6 tests remain after tcp (greet/connect/udp/
-	// voice-quality/voice-srv/api). Cancel may race with greet
-	// completing successfully, so accept ≥4.
-	assert.GreaterOrEqual(t, failed+skipped, 4, "expected at least 4 cancellation-marked results, got failed=%d skipped=%d all=%+v", failed, skipped, results)
+	// Without auth, 5 tests remain after tcp (greet/connect/udp/
+	// voice-quality/api). Cancel may race with greet
+	// completing successfully, so accept ≥3.
+	assert.GreaterOrEqual(t, failed+skipped, 3, "expected at least 3 cancellation-marked results, got failed=%d skipped=%d all=%+v", failed, skipped, results)
 }
 
 func TestRun_AppliesDefaults(t *testing.T) {
@@ -979,27 +940,6 @@ func TestRun_VoiceQualityFail(t *testing.T) {
 	assert.NotEmpty(t, rVQ.Hint)
 }
 
-// TestRun_VoiceSrvAllResolvedNoneReachable: DNS resolves localhost but
-// the proxy refuses CONNECT to :443. Expect StatusWarn with "0/1 regions
-// reachable" metric.
-func TestRun_VoiceSrvAllResolvedNoneReachable(t *testing.T) {
-	fp := newFakeProxy(t, "voice_srv_blocked")
-	cfg := proxyConfig(fp, false)
-	cfg.DiscordGateway = stubGatewayAddr(t)
-	cfg.DiscordAPI = stubAPIServer(t, fp, 200)
-	cfg.StunServer = "127.0.0.1:65000"
-	fp.blockVoiceCONNECT.Store(true)
-
-	ch := Run(context.Background(), cfg)
-	results := drainResults(t, ch, 15*time.Second)
-
-	rVS, ok := finalByID(results, "voice-srv")
-	require.True(t, ok)
-	assert.Equal(t, StatusWarn, rVS.Status, "got %+v", rVS)
-	assert.Equal(t, "0/1 regions reachable", rVS.Metric)
-	assert.NotEmpty(t, rVS.Hint)
-}
-
 func TestExtractRawHex(t *testing.T) {
 	cases := []struct {
 		in, want string

internal/checker/hints.go

@@ -38,8 +38,6 @@ func tcpFriendlyName(testID string) string {
 		return "UDP ASSOCIATE"
 	case "voice-quality":
 		return "качество UDP-канала"
-	case "voice-srv":
-		return "доступность voice-серверов Discord"
 	case "api":
 		return "Discord API"
 	default:
@@ -147,16 +145,6 @@ func hintFor(testID string, err error) string {
 		}
 		return genericFallback(testID, err)
 
-	case "voice-srv":
-		var dnsErr *net.DNSError
-		if errors.As(err, &dnsErr) {
-			return "DNS не резолвит voice-домены Discord."
-		}
-		if isTimeout {
-			return "Не удалось проверить voice-серверы Discord вовремя — таймаут."
-		}
-		return fmt.Sprintf("Не удалось проверить доступность Discord voice-серверов: %s.", err.Error())
-
 	case "api":
 		switch {
 		case isTimeout:

internal/checker/hints_test.go

@@ -18,7 +18,7 @@ func TestHintFor(t *testing.T) {
 	t.Run("context_canceled_uniform", func(t *testing.T) {
 		// Cancellation is always reported as «Проверка отменена.» across
 		// all testIDs.
-		for _, id := range []string{"tcp", "greet", "auth", "connect", "udp", "voice-quality", "voice-srv", "api", "unknown"} {
+		for _, id := range []string{"tcp", "greet", "auth", "connect", "udp", "voice-quality", "api", "unknown"} {
 			assert.Equal(t, "Проверка отменена.", hintFor(id, context.Canceled), "id=%s", id)
 			assert.Equal(t, "Проверка отменена.", hintFor(id, context.DeadlineExceeded), "id=%s", id)
 		}
@@ -121,10 +121,6 @@ func TestHintFor_PerStepBranches(t *testing.T) {
 		{"voice_quality_unsupported_family", "voice-quality", ErrSTUNUnsupportedFamily, "мусор"},
 		{"voice_quality_fallback", "voice-quality", errors.New("weird"), "качество"},
 
-		// voice-srv: DNS error, timeout, generic
-		{"voice_srv_timeout", "voice-srv", &timeoutOnlyError{}, "таймаут"},
-		{"voice_srv_generic", "voice-srv", errors.New("boom"), "boom"},
-
 		// api: timeout vs generic
 		{"api_timeout", "api", &timeoutOnlyError{}, "таймаут"},
 		{"api_generic", "api", errors.New("tls boom"), "TLS"},
@@ -158,7 +154,6 @@ func TestTcpFriendlyName(t *testing.T) {
 		"connect":       "TCP-туннель к Discord",
 		"udp":           "UDP ASSOCIATE",
 		"voice-quality": "качество UDP-канала",
-		"voice-srv":     "доступность voice-серверов Discord",
 		"api":           "Discord API",
 		"weirdo":        "weirdo",
 	}

internal/checker/voice.go

@@ -2,20 +2,11 @@ package checker
 
 // voice.go — predictive voice diagnostics.
 //
-// Two primitives sit on top of the SOCKS5/STUN building blocks already
-// in this package:
-//
-//   - runVoiceQualityBurst: fire a burst of STUN binding requests through
-//     an open SOCKS5 UDP relay, then derive packet-loss / jitter /
+// runVoiceQualityBurst fires a burst of STUN binding requests through
+// an open SOCKS5 UDP relay, then derives packet-loss / jitter /
 // percentile-RTT from the replies. A single round-trip says the relay
 // accepts UDP; a 30-packet burst tells you whether voice will actually
 // hold together.
-//
-//   - runVoiceServerProbe: parallel-DNS a list of <region>.discord.media
-//     hostnames, then SOCKS5 CONNECT to :443 on each, recording which
-//     regions are reachable through the proxy. DNS-resolves-but-CONNECT-fails
-//     is a very common Russian-DPI failure mode that all five preceding
-//     SOCKS5 sanity checks miss.
 
 import (
 	"context"
@@ -283,156 +274,3 @@ sendLoop:
 
 	return res, nil
 }
-
-// VoiceServerProbeResult lists Discord voice-domain hostnames split by
-// outcome. Resolved is ordered by input position; Reachable is too.
-type VoiceServerProbeResult struct {
-	Resolved               []string // hostnames that got at least one A record
-	Reachable              []string // hostnames that succeeded SOCKS5 CONNECT
-	Unresolved             []string // hostnames that didn't resolve at all
-	UnreachableButResolved []string // resolved but proxy CONNECT failed
-}
-
-// runVoiceServerProbe resolves each hostname and, for those that resolved
-// to ≥ 1 IPv4, performs a SOCKS5 CONNECT to host:443 through proxyAddr.
-// REP=00 is enough — we don't actually do TLS.
-//
-// DNS goes through the OS resolver (not the proxy). For tests, pass
-// hostnames that always resolve locally (e.g. "localhost").
-//
-// Returns an error only when ctx is cancelled.
-func runVoiceServerProbe(
-	ctx context.Context,
-	hostnames []string,
-	proxyAddr string,
-	useAuth bool,
-	login, password string,
-	dialTimeout time.Duration,
-) (VoiceServerProbeResult, error) {
-	if dialTimeout <= 0 {
-		dialTimeout = 1 * time.Second
-	}
-
-	const dnsConcurrency = 16
-	const connectConcurrency = 8
-
-	// Phase 1: parallel DNS.
-	type dnsOut struct {
-		idx      int
-		host     string
-		resolved bool
-	}
-	dnsResults := make([]dnsOut, len(hostnames))
-	var wg sync.WaitGroup
-	dnsSem := make(chan struct{}, dnsConcurrency)
-	for i, h := range hostnames {
-		wg.Add(1)
-		dnsSem <- struct{}{}
-		go func(i int, h string) {
-			defer wg.Done()
-			defer func() { <-dnsSem }()
-			ips, err := net.DefaultResolver.LookupIP(ctx, "ip4", h)
-			ok := err == nil && len(ips) > 0
-			dnsResults[i] = dnsOut{idx: i, host: h, resolved: ok}
-		}(i, h)
-	}
-	wg.Wait()
-
-	if cerr := ctx.Err(); cerr != nil {
-		return VoiceServerProbeResult{}, cerr
-	}
-
-	res := VoiceServerProbeResult{}
-	// Build resolved/unresolved lists in input order.
-	resolvedHosts := make([]string, 0, len(hostnames))
-	for _, dr := range dnsResults {
-		if dr.resolved {
-			res.Resolved = append(res.Resolved, dr.host)
-			resolvedHosts = append(resolvedHosts, dr.host)
-		} else {
-			res.Unresolved = append(res.Unresolved, dr.host)
-		}
-	}
-
-	if len(resolvedHosts) == 0 {
-		return res, nil
-	}
-
-	// Phase 2: parallel SOCKS5 CONNECT.
-	reachable := make([]bool, len(resolvedHosts))
-	connectSem := make(chan struct{}, connectConcurrency)
-	wg = sync.WaitGroup{}
-	for i, h := range resolvedHosts {
-		wg.Add(1)
-		connectSem <- struct{}{}
-		go func(i int, h string) {
-			defer wg.Done()
-			defer func() { <-connectSem }()
-			reachable[i] = probeSocks5Connect(ctx, proxyAddr, useAuth, login, password, h, 443, dialTimeout)
-		}(i, h)
-	}
-	wg.Wait()
-
-	if cerr := ctx.Err(); cerr != nil {
-		return res, cerr
-	}
-	for i, h := range resolvedHosts {
-		if reachable[i] {
-			res.Reachable = append(res.Reachable, h)
-		} else {
-			res.UnreachableButResolved = append(res.UnreachableButResolved, h)
-		}
-	}
-	return res, nil
-}
-
-// probeSocks5Connect opens one fresh TCP connection to proxyAddr, runs
-// the SOCKS5 handshake and CONNECT request to host:port, and returns
-// true iff the proxy replied REP=00. Always closes the conn before
-// returning.
-func probeSocks5Connect(
-	parent context.Context,
-	proxyAddr string,
-	useAuth bool,
-	login, password string,
-	host string,
-	port uint16,
-	dialTimeout time.Duration,
-) bool {
-	ctx, cancel := context.WithTimeout(parent, dialTimeout)
-	defer cancel()
-
-	var d net.Dialer
-	conn, err := d.DialContext(ctx, "tcp", proxyAddr)
-	if err != nil {
-		return false
-	}
-	defer conn.Close()
-
-	if _, _, gerr := socks5Greeting(ctx, conn, useAuth); gerr != nil {
-		return false
-	}
-	if useAuth {
-		if _, aerr := socks5Auth(ctx, conn, login, password); aerr != nil {
-			return false
-		}
-	}
-	if _, cerr := socks5Connect(ctx, conn, host, port); cerr != nil {
-		return false
-	}
-	return true
-}
-
-// defaultVoiceHostnames is the built-in list used when
-// Config.VoiceServerHostnames is empty. Order matters — the GUI shows
-// the first three reachable regions in the metric line.
-var defaultVoiceHostnames = []string{
-	"russia.discord.media", "russia2.discord.media",
-	"frankfurt.discord.media", "europe.discord.media",
-	"singapore.discord.media", "japan.discord.media",
-	"us-east.discord.media", "us-west.discord.media",
-	"brazil.discord.media", "india.discord.media",
-	"hongkong.discord.media", "southkorea.discord.media",
-	"sydney.discord.media", "southafrica.discord.media",
-	"dubai.discord.media", "atlanta.discord.media",
-}

internal/checker/voice_test.go

@@ -190,111 +190,3 @@ func TestVoiceQualityBurst_ZeroCount(t *testing.T) {
 		"localhost", 19302, 0, 5*time.Millisecond)
 	assert.Error(t, err)
 }
-
-// TestVoiceServerProbe_HappyAndBlocked: against a fake SOCKS5 server, one
-// hostname (localhost) succeeds (REP=00) and another (127.0.0.1) gets
-// blocked (REP=05). Both resolve at the OS level, so Resolved should be
-// {localhost, 127.0.0.1}; Reachable should be {localhost}; Unreachable
-// should be {127.0.0.1}.
-func TestVoiceServerProbe_HappyAndBlocked(t *testing.T) {
-	// Stand up a tiny fake SOCKS5 server that completes greet+CONNECT
-	// only for hostname "localhost"; CONNECT to "127.0.0.1" is refused
-	// with REP=05. We don't need full RFC 1928 — just enough to drive
-	// the probe path.
-	ln, err := net.Listen("tcp", "127.0.0.1:0")
-	require.NoError(t, err)
-	defer ln.Close()
-	go func() {
-		for {
-			c, err := ln.Accept()
-			if err != nil {
-				return
-			}
-			go func(c net.Conn) {
-				defer c.Close()
-				_ = c.SetDeadline(time.Now().Add(2 * time.Second))
-				// Read greeting: VER NMETHODS METHODS...
-				hdr := make([]byte, 2)
-				if _, err := readFull(c, hdr); err != nil {
-					return
-				}
-				if hdr[0] != 0x05 {
-					return
-				}
-				methods := make([]byte, hdr[1])
-				if _, err := readFull(c, methods); err != nil {
-					return
-				}
-				// Reply: no-auth.
-				_, _ = c.Write([]byte{0x05, 0x00})
-				// Read CONNECT request: VER CMD RSV ATYP...
-				h2 := make([]byte, 4)
-				if _, err := readFull(c, h2); err != nil {
-					return
-				}
-				var host string
-				switch h2[3] {
-				case 0x01:
-					ip := make([]byte, 4)
-					_, _ = readFull(c, ip)
-					host = net.IP(ip).String()
-				case 0x03:
-					l := make([]byte, 1)
-					_, _ = readFull(c, l)
-					name := make([]byte, int(l[0]))
-					_, _ = readFull(c, name)
-					host = string(name)
-				}
-				port := make([]byte, 2)
-				_, _ = readFull(c, port)
-				// Reply REP=00 only for hostname "localhost"; refuse otherwise.
-				if host == "localhost" {
-					_, _ = c.Write([]byte{0x05, 0x00, 0x00, 0x01, 0, 0, 0, 0, 0, 0})
-				} else {
-					_, _ = c.Write([]byte{0x05, 0x05, 0x00, 0x01, 0, 0, 0, 0, 0, 0})
-				}
-			}(c)
-		}
-	}()
-
-	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
-	defer cancel()
-
-	res, err := runVoiceServerProbe(ctx,
-		[]string{"localhost", "127.0.0.1"}, ln.Addr().String(),
-		false, "", "", 1*time.Second)
-	require.NoError(t, err)
-
-	assert.ElementsMatch(t, []string{"localhost", "127.0.0.1"}, res.Resolved)
-	assert.Equal(t, []string{"localhost"}, res.Reachable)
-	assert.Equal(t, []string{"127.0.0.1"}, res.UnreachableButResolved)
-	assert.Empty(t, res.Unresolved)
-}
-
-// TestVoiceServerProbe_EmptyHostnameList: zero-length input → zero-length
-// Resolved/Reachable, no error.
-func TestVoiceServerProbe_EmptyHostnameList(t *testing.T) {
-	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
-	defer cancel()
-
-	res, err := runVoiceServerProbe(ctx,
-		[]string{}, "127.0.0.1:1", false, "", "", 100*time.Millisecond)
-	require.NoError(t, err)
-
-	assert.Empty(t, res.Resolved)
-	assert.Empty(t, res.Reachable)
-	assert.Empty(t, res.Unresolved)
-}
-
-// readFull is a tiny helper to avoid importing io just for this.
-func readFull(c net.Conn, buf []byte) (int, error) {
-	got := 0
-	for got < len(buf) {
-		n, err := c.Read(buf[got:])
-		got += n
-		if err != nil {
-			return got, err
-		}
-	}
-	return got, nil
-}

internal/gui/app.go

@@ -68,7 +68,7 @@ type Config struct {
 // for them on the "check:result" event. Mirrors checker.Result but with
 // Duration converted to milliseconds (int) for the JS side.
 type CheckResult struct {
-	ID       string `json:"id"`     // tcp / greet / auth / connect / udp / voice-quality / voice-srv / api
+	ID       string `json:"id"`     // tcp / greet / auth / connect / udp / voice-quality / api
 	Status   string `json:"status"` // running | passed | warn | failed | skipped
 	Metric   string `json:"metric,omitempty"`
 	Error    string `json:"error,omitempty"`

internal/gui/frontend/src/components/shared.jsx

@@ -24,7 +24,6 @@ export const ALL_TESTS = [
   { id: 'connect',       label: 'TCP CONNECT to Discord',   desc: 'Прокси проксирует TCP к gateway' },
   { id: 'udp',           label: 'UDP ASSOCIATE',            desc: 'Прокси выдал UDP-релей' },
   { id: 'voice-quality', label: 'UDP voice quality',        desc: 'Бёрст 30 STUN-пакетов через релей: потери, джиттер, латентность' },
-  { id: 'voice-srv',     label: 'Discord voice servers',    desc: 'Какие регионы Discord media доступны через прокси' },
   { id: 'api',           label: 'Discord API reachable',    desc: 'HTTPS до discord.com через прокси' },
 ];