base/native_library_fuchsia.cc

   1 // Copyright 2018 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/native_library.h"
   6
   7 #include <fcntl.h>
   8 #include <fuchsia/io/cpp/fidl.h>
   9 #include <lib/fdio/directory.h>
  10 #include <lib/fdio/io.h>
  11 #include <lib/zx/vmo.h>
  12 #include <stdio.h>
  13 #include <zircon/dlfcn.h>
  14 #include <zircon/status.h>
  15 #include <zircon/syscalls.h>
  16
  17 #include "base/base_paths.h"
  18 #include "base/files/file.h"
  19 #include "base/files/file_path.h"
  20 #include "base/fuchsia/fuchsia_logging.h"
  21 #include "base/notreached.h"
  22 #include "base/path_service.h"
  23 #include "base/posix/safe_strerror.h"
  24 #include "base/strings/strcat.h"
  25 #include "base/strings/string_piece.h"
  26 #include "base/strings/stringprintf.h"
  27 #include "base/strings/utf_string_conversions.h"
  28 #include "base/threading/thread_restrictions.h"
  29 #include "base_paths.h"
  30
  31 namespace base {
  32
  33 std::string NativeLibraryLoadError::ToString() const {
  34   return message;
  35 }
  36
  37 NativeLibrary LoadNativeLibraryWithOptions(const FilePath& library_path,
  38                                            const NativeLibraryOptions& options,
  39                                            NativeLibraryLoadError* error) {
  40   FilePath computed_path;
  41   FilePath library_root_path =
  42       base::PathService::CheckedGet(DIR_ASSETS).Append("lib");
  43   if (library_path.IsAbsolute()) {
  44     // See more info in fxbug.dev/105910.
  45     if (!library_root_path.IsParent(library_path)) {
  46       auto error_message =
  47           base::StringPrintf("Absolute library paths must begin with %s",
  48                              library_root_path.value().c_str());
  49       DLOG(ERROR) << error_message;
  50       if (error) {
  51         error->message = std::move(error_message);
  52       }
  53       return nullptr;
  54     }
  55     computed_path = library_path;
  56   } else {
  57     computed_path = library_root_path.Append(library_path);
  58   }
  59
  60   // Use fdio_open_fd (a Fuchsia-specific API) here so we can pass the
  61   // appropriate FS rights flags to request executability.
  62   // TODO(crbug.com/1018538): Teach base::File about FLAG_WIN_EXECUTE on
  63   // Fuchsia, and then use it here instead of using fdio_open_fd() directly.
  64   base::ScopedFD fd;
  65   zx_status_t status = fdio_open_fd(
  66       computed_path.value().c_str(),
  67       static_cast<uint32_t>(fuchsia::io::OpenFlags::RIGHT_READABLE |
  68                             fuchsia::io::OpenFlags::RIGHT_EXECUTABLE),
  69       base::ScopedFD::Receiver(fd).get());
  70   if (status != ZX_OK) {
  71     if (error) {
  72       error->message =
  73           base::StringPrintf("fdio_open_fd: %s", zx_status_get_string(status));
  74     }
  75     return nullptr;
  76   }
  77
  78   zx::vmo vmo;
  79   status = fdio_get_vmo_exec(fd.get(), vmo.reset_and_get_address());
  80   if (status != ZX_OK) {
  81     if (error) {
  82       error->message = base::StringPrintf("fdio_get_vmo_exec: %s",
  83                                           zx_status_get_string(status));
  84     }
  85     return nullptr;
  86   }
  87
  88   NativeLibrary result = dlopen_vmo(vmo.get(), RTLD_LAZY | RTLD_LOCAL);
  89   return result;
  90 }
  91
  92 void UnloadNativeLibrary(NativeLibrary library) {
  93   // dlclose() is a no-op on Fuchsia, so do nothing here.
  94 }
  95
  96 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
  97                                           const char* name) {
  98   return dlsym(library, name);
  99 }
 100
 101 std::string GetNativeLibraryName(StringPiece name) {
 102   return StrCat({"lib", name, ".so"});
 103 }
 104
 105 std::string GetLoadableModuleName(StringPiece name) {
 106   return GetNativeLibraryName(name);
 107 }
 108
 109 }  // namespace base