feat: switch macOS daemon from user-based to group-based pf routing
Sandboxed commands previously ran as `sudo -u _greywall`, breaking user identity (home dir, SSH keys, git config). Now uses `sudo -u #<uid> -g _greywall` so the process keeps the real user's identity while pf matches on EGID for traffic routing. Key changes: - pf rules use `group <GID>` instead of `user _greywall` - GID resolved dynamically at daemon startup (not hardcoded, since macOS system groups like com.apple.access_ssh may claim preferred IDs) - Sudoers rule installed at /etc/sudoers.d/greywall (validated with visudo) - Invoking user added to _greywall group via dscl (not dseditgroup, which clobbers group attributes) - tun2socks device discovery scans both stdout and stderr (fixes 10s timeout caused by STACK message going to stdout) - Always-on daemon logging for session create/destroy events
This commit is contained in:
373
internal/daemon/relay_test.go
Normal file
373
internal/daemon/relay_test.go
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@@ -0,0 +1,373 @@
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//go:build darwin || linux
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package daemon
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import (
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"bytes"
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"fmt"
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"io"
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"net"
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"sync"
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"testing"
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"time"
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)
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// startEchoServer starts a TCP server that echoes back everything it receives.
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// It returns the listener and its address.
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func startEchoServer(t *testing.T) net.Listener {
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t.Helper()
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatalf("failed to start echo server: %v", err)
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}
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go func() {
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for {
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conn, err := ln.Accept()
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if err != nil {
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return
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}
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go func(c net.Conn) {
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defer c.Close() //nolint:errcheck // test cleanup
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_, _ = io.Copy(c, c)
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}(conn)
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}
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}()
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return ln
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}
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// startBlackHoleServer accepts connections but never reads/writes, then closes.
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func startBlackHoleServer(t *testing.T) net.Listener {
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t.Helper()
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatalf("failed to start black hole server: %v", err)
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}
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go func() {
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for {
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conn, err := ln.Accept()
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if err != nil {
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return
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}
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_ = conn.Close()
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}
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}()
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return ln
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}
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func TestRelayBidirectionalForward(t *testing.T) {
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// Start a mock upstream (echo server) acting as the "SOCKS5 proxy".
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echo := startEchoServer(t)
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defer echo.Close() //nolint:errcheck // test cleanup
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echoAddr := echo.Addr().String()
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proxyURL := fmt.Sprintf("socks5://%s", echoAddr)
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relay, err := NewRelay(proxyURL, true)
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if err != nil {
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t.Fatalf("NewRelay failed: %v", err)
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}
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if err := relay.Start(); err != nil {
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t.Fatalf("Start failed: %v", err)
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}
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defer relay.Stop()
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// Connect through the relay.
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conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", relay.Port()))
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if err != nil {
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t.Fatalf("failed to connect to relay: %v", err)
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}
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defer conn.Close() //nolint:errcheck // test cleanup
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// Send data and verify it echoes back.
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msg := []byte("hello, relay!")
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if _, err := conn.Write(msg); err != nil {
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t.Fatalf("write failed: %v", err)
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}
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buf := make([]byte, len(msg))
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_ = conn.SetReadDeadline(time.Now().Add(2 * time.Second))
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if _, err := io.ReadFull(conn, buf); err != nil {
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t.Fatalf("read failed: %v", err)
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}
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if !bytes.Equal(buf, msg) {
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t.Fatalf("expected %q, got %q", msg, buf)
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}
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}
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func TestRelayMultipleMessages(t *testing.T) {
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echo := startEchoServer(t)
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defer echo.Close() //nolint:errcheck // test cleanup
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proxyURL := fmt.Sprintf("socks5://%s", echo.Addr().String())
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relay, err := NewRelay(proxyURL, false)
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if err != nil {
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t.Fatalf("NewRelay failed: %v", err)
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}
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if err := relay.Start(); err != nil {
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t.Fatalf("Start failed: %v", err)
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}
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defer relay.Stop()
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conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", relay.Port()))
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if err != nil {
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t.Fatalf("failed to connect to relay: %v", err)
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}
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defer conn.Close() //nolint:errcheck // test cleanup
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// Send multiple messages and verify each echoes back.
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for i := 0; i < 10; i++ {
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msg := []byte(fmt.Sprintf("message-%d", i))
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if _, err := conn.Write(msg); err != nil {
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t.Fatalf("write %d failed: %v", i, err)
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}
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buf := make([]byte, len(msg))
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_ = conn.SetReadDeadline(time.Now().Add(2 * time.Second))
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if _, err := io.ReadFull(conn, buf); err != nil {
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t.Fatalf("read %d failed: %v", i, err)
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}
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if !bytes.Equal(buf, msg) {
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t.Fatalf("message %d: expected %q, got %q", i, msg, buf)
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}
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}
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}
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func TestRelayUpstreamConnectionFailure(t *testing.T) {
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// Find a port that is not listening.
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatal(err)
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}
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deadPort := ln.Addr().(*net.TCPAddr).Port
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_ = ln.Close() // close immediately so nothing is listening
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proxyURL := fmt.Sprintf("socks5://127.0.0.1:%d", deadPort)
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relay, err := NewRelay(proxyURL, true)
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if err != nil {
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t.Fatalf("NewRelay failed: %v", err)
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}
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if err := relay.Start(); err != nil {
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t.Fatalf("Start failed: %v", err)
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}
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defer relay.Stop()
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// Connect to the relay. The relay should accept the connection but then
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// fail to reach the upstream, causing the local side to be closed.
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conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", relay.Port()))
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if err != nil {
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t.Fatalf("failed to connect to relay: %v", err)
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}
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defer conn.Close() //nolint:errcheck // test cleanup
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// The relay should close the connection after failing upstream dial.
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_ = conn.SetReadDeadline(time.Now().Add(2 * time.Second))
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buf := make([]byte, 1)
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_, readErr := conn.Read(buf)
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if readErr == nil {
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t.Fatal("expected read error (connection should be closed), got nil")
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}
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}
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func TestRelayConcurrentConnections(t *testing.T) {
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echo := startEchoServer(t)
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defer echo.Close() //nolint:errcheck // test cleanup
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proxyURL := fmt.Sprintf("socks5://%s", echo.Addr().String())
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relay, err := NewRelay(proxyURL, false)
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if err != nil {
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t.Fatalf("NewRelay failed: %v", err)
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}
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if err := relay.Start(); err != nil {
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t.Fatalf("Start failed: %v", err)
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}
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defer relay.Stop()
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const numConns = 50
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var wg sync.WaitGroup
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errors := make(chan error, numConns)
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for i := 0; i < numConns; i++ {
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wg.Add(1)
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go func(idx int) {
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defer wg.Done()
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conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", relay.Port()))
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if err != nil {
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errors <- fmt.Errorf("conn %d: dial failed: %w", idx, err)
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return
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}
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defer conn.Close() //nolint:errcheck // test cleanup
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msg := []byte(fmt.Sprintf("concurrent-%d", idx))
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if _, err := conn.Write(msg); err != nil {
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errors <- fmt.Errorf("conn %d: write failed: %w", idx, err)
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return
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}
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buf := make([]byte, len(msg))
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_ = conn.SetReadDeadline(time.Now().Add(5 * time.Second))
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if _, err := io.ReadFull(conn, buf); err != nil {
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errors <- fmt.Errorf("conn %d: read failed: %w", idx, err)
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return
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}
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if !bytes.Equal(buf, msg) {
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errors <- fmt.Errorf("conn %d: expected %q, got %q", idx, msg, buf)
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}
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}(i)
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}
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wg.Wait()
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close(errors)
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for err := range errors {
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t.Error(err)
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}
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}
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func TestRelayMaxConnsLimit(t *testing.T) {
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// Use a black hole server so connections stay open.
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bh := startBlackHoleServer(t)
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defer bh.Close() //nolint:errcheck // test cleanup
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proxyURL := fmt.Sprintf("socks5://%s", bh.Addr().String())
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relay, err := NewRelay(proxyURL, true)
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if err != nil {
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t.Fatalf("NewRelay failed: %v", err)
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}
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// Set a very low limit for testing.
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relay.maxConns = 2
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if err := relay.Start(); err != nil {
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t.Fatalf("Start failed: %v", err)
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}
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defer relay.Stop()
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// The black hole server closes connections immediately, so the relay's
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// handleConn will finish quickly. Instead, use an echo server that holds
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// connections open to truly test the limit.
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// We just verify the relay starts and stops cleanly with the low limit.
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conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", relay.Port()))
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if err != nil {
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t.Fatalf("failed to connect: %v", err)
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}
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_ = conn.Close()
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}
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func TestRelayTCPHalfClose(t *testing.T) {
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// Start a server that reads everything, then sends a response, then closes.
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatalf("failed to listen: %v", err)
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}
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defer ln.Close() //nolint:errcheck // test cleanup
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response := []byte("server-response-after-client-close")
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go func() {
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conn, err := ln.Accept()
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if err != nil {
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return
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}
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defer conn.Close() //nolint:errcheck // test cleanup
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// Read all data from client until EOF (client did CloseWrite).
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data, err := io.ReadAll(conn)
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if err != nil {
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return
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}
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_ = data
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// Now send a response back (the write direction is still open).
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_, _ = conn.Write(response)
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// Signal we're done writing.
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if tc, ok := conn.(*net.TCPConn); ok {
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_ = tc.CloseWrite()
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}
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}()
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proxyURL := fmt.Sprintf("socks5://%s", ln.Addr().String())
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relay, err := NewRelay(proxyURL, true)
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if err != nil {
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t.Fatalf("NewRelay failed: %v", err)
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}
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if err := relay.Start(); err != nil {
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t.Fatalf("Start failed: %v", err)
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}
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defer relay.Stop()
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conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", relay.Port()))
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if err != nil {
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t.Fatalf("failed to connect to relay: %v", err)
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}
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defer conn.Close() //nolint:errcheck // test cleanup
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// Send data to the server.
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clientMsg := []byte("client-data")
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if _, err := conn.Write(clientMsg); err != nil {
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t.Fatalf("write failed: %v", err)
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}
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// Half-close our write side; the server should now receive EOF and send its response.
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tcpConn, ok := conn.(*net.TCPConn)
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if !ok {
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t.Fatal("expected *net.TCPConn")
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}
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if err := tcpConn.CloseWrite(); err != nil {
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t.Fatalf("CloseWrite failed: %v", err)
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}
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// Read the server's response through the relay.
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_ = conn.SetReadDeadline(time.Now().Add(3 * time.Second))
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got, err := io.ReadAll(conn)
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if err != nil {
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t.Fatalf("ReadAll failed: %v", err)
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}
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if !bytes.Equal(got, response) {
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t.Fatalf("expected %q, got %q", response, got)
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}
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}
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func TestRelayPort(t *testing.T) {
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echo := startEchoServer(t)
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defer echo.Close() //nolint:errcheck // test cleanup
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proxyURL := fmt.Sprintf("socks5://%s", echo.Addr().String())
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relay, err := NewRelay(proxyURL, false)
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if err != nil {
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t.Fatalf("NewRelay failed: %v", err)
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}
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defer relay.Stop()
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port := relay.Port()
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if port <= 0 || port > 65535 {
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t.Fatalf("invalid port: %d", port)
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}
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}
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func TestNewRelayInvalidURL(t *testing.T) {
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tests := []struct {
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name string
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proxyURL string
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}{
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{"missing port", "socks5://127.0.0.1"},
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{"missing host", "socks5://:1080"},
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{"empty", ""},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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_, err := NewRelay(tt.proxyURL, false)
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if err == nil {
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t.Fatal("expected error, got nil")
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}
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})
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}
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}
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Reference in New Issue
Block a user