all: fix system hosts file path

internal/cmd/paths.go

@@ -0,0 +1,6 @@
+package cmd
+
+// DefaultHostsPaths returns the slice of default paths to system hosts files.
+func DefaultHostsPaths() (paths []string, err error) {
+	return defaultHostsPaths()
+}

internal/cmd/paths_darwin.go

@@ -0,0 +1,8 @@
+//go:build darwin
+
+package cmd
+
+// defaultHostsPaths returns default paths to hosts files for macOS.
+func defaultHostsPaths() (paths []string, err error) {
+	return []string{"/private/etc/hosts"}, nil
+}

internal/cmd/paths_others.go

@@ -0,0 +1,8 @@
+//go:build !windows && !darwin
+
+package cmd
+
+// defaultHostsPaths returns default paths to hosts files for UNIX.
+func defaultHostsPaths() (paths []string, err error) {
+	return []string{"/etc/hosts"}, nil
+}

internal/cmd/paths_windows.go

@@ -0,0 +1,22 @@
+//go:build windows
+
+package cmd
+
+import (
+	"fmt"
+	"path"
+
+	"golang.org/x/sys/windows"
+)
+
+// defaultHostsPaths returns default paths to hosts files for Windows.
+func defaultHostsPaths() (paths []string, err error) {
+	sysDir, err := windows.GetSystemDirectory()
+	if err != nil {
+		return []string{}, fmt.Errorf("getting system directory: %w", err)
+	}
+
+	p := path.Join(sysDir, "drivers", "etc", "hosts")
+
+	return []string{p}, nil
+}

internal/cmd/proxy.go

@@ -18,7 +18,6 @@ import (
 	"github.com/AdguardTeam/dnsproxy/proxy"
 	"github.com/AdguardTeam/dnsproxy/upstream"
 	"github.com/AdguardTeam/golibs/errors"
-	"github.com/AdguardTeam/golibs/hostsfile"
 	"github.com/AdguardTeam/golibs/logutil/slogutil"
 	"github.com/AdguardTeam/golibs/netutil"
 	"github.com/AdguardTeam/golibs/osutil"
@@ -518,7 +517,7 @@ func (conf *configuration) hostsFiles(ctx context.Context, l *slog.Logger) (path
 		return conf.HostsFiles, nil
 	}
 
-	paths, err = hostsfile.DefaultHostsPaths()
+	paths, err = DefaultHostsPaths()
 	if err != nil {
 		return nil, fmt.Errorf("getting default hosts files: %w", err)
 	}