aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/protoc/src/google/protobuf/compiler/importer.cc
blob: 2fdbf5ce1fd2b0a8cdcd7a3a630d6bd1e7a03b5a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#ifdef _MSC_VER
#include <direct.h>
#else
#include <unistd.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>

#include <algorithm>
#include <memory>

#include <google/protobuf/compiler/importer.h>
#include <google/protobuf/compiler/parser.h>
#include <google/protobuf/io/tokenizer.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <google/protobuf/stubs/strutil.h>
#include <google/protobuf/io/io_win32.h>

#ifdef _WIN32
#include <ctype.h>
#endif

namespace google {
namespace protobuf {
namespace compiler {

#ifdef _WIN32
// DO NOT include <io.h>, instead create functions in io_win32.{h,cc} and import
// them like we do below.
using google::protobuf::io::win32::access;
using google::protobuf::io::win32::open;
#endif

// Returns true if the text looks like a Windows-style absolute path, starting
// with a drive letter.  Example:  "C:\foo".  TODO(kenton):  Share this with
// copy in command_line_interface.cc?
static bool IsWindowsAbsolutePath(const TProtoStringType& text) {
#if defined(_WIN32) || defined(__CYGWIN__)
  return text.size() >= 3 && text[1] == ':' && isalpha(text[0]) &&
         (text[2] == '/' || text[2] == '\\') && text.find_last_of(':') == 1;
#else
  return false;
#endif
}

MultiFileErrorCollector::~MultiFileErrorCollector() {}

// This class serves two purposes:
// - It implements the ErrorCollector interface (used by Tokenizer and Parser)
//   in terms of MultiFileErrorCollector, using a particular filename.
// - It lets us check if any errors have occurred.
class SourceTreeDescriptorDatabase::SingleFileErrorCollector
    : public io::ErrorCollector {
 public:
  SingleFileErrorCollector(const TProtoStringType& filename,
                           MultiFileErrorCollector* multi_file_error_collector)
      : filename_(filename),
        multi_file_error_collector_(multi_file_error_collector),
        had_errors_(false) {}
  ~SingleFileErrorCollector() {}

  bool had_errors() { return had_errors_; }

  // implements ErrorCollector ---------------------------------------
  void AddError(int line, int column, const TProtoStringType& message) override {
    if (multi_file_error_collector_ != NULL) {
      multi_file_error_collector_->AddError(filename_, line, column, message);
    }
    had_errors_ = true;
  }

 private:
  TProtoStringType filename_;
  MultiFileErrorCollector* multi_file_error_collector_;
  bool had_errors_;
};

// ===================================================================

SourceTreeDescriptorDatabase::SourceTreeDescriptorDatabase(
    SourceTree* source_tree)
    : source_tree_(source_tree),
      fallback_database_(nullptr),
      error_collector_(nullptr),
      using_validation_error_collector_(false),
      validation_error_collector_(this) {}

SourceTreeDescriptorDatabase::SourceTreeDescriptorDatabase(
    SourceTree* source_tree, DescriptorDatabase* fallback_database)
    : source_tree_(source_tree),
      fallback_database_(fallback_database),
      error_collector_(nullptr),
      using_validation_error_collector_(false),
      validation_error_collector_(this) {}

SourceTreeDescriptorDatabase::~SourceTreeDescriptorDatabase() {}

bool SourceTreeDescriptorDatabase::FindFileByName(const TProtoStringType& filename,
                                                  FileDescriptorProto* output) {
  std::unique_ptr<io::ZeroCopyInputStream> input(source_tree_->Open(filename));
  if (input == NULL) {
    if (fallback_database_ != nullptr &&
        fallback_database_->FindFileByName(filename, output)) {
      return true;
    }
    if (error_collector_ != NULL) {
      error_collector_->AddError(filename, -1, 0,
                                 source_tree_->GetLastErrorMessage());
    }
    return false;
  }

  // Set up the tokenizer and parser.
  SingleFileErrorCollector file_error_collector(filename, error_collector_);
  io::Tokenizer tokenizer(input.get(), &file_error_collector);

  Parser parser;
  if (error_collector_ != NULL) {
    parser.RecordErrorsTo(&file_error_collector);
  }
  if (using_validation_error_collector_) {
    parser.RecordSourceLocationsTo(&source_locations_);
  }

  // Parse it.
  output->set_name(filename);
  return parser.Parse(&tokenizer, output) && !file_error_collector.had_errors();
}

bool SourceTreeDescriptorDatabase::FindFileContainingSymbol(
    const TProtoStringType& symbol_name, FileDescriptorProto* output) {
  return false;
}

bool SourceTreeDescriptorDatabase::FindFileContainingExtension(
    const TProtoStringType& containing_type, int field_number,
    FileDescriptorProto* output) {
  return false;
}

// -------------------------------------------------------------------

SourceTreeDescriptorDatabase::ValidationErrorCollector::
    ValidationErrorCollector(SourceTreeDescriptorDatabase* owner)
    : owner_(owner) {}

SourceTreeDescriptorDatabase::ValidationErrorCollector::
    ~ValidationErrorCollector() {}

void SourceTreeDescriptorDatabase::ValidationErrorCollector::AddError(
    const TProtoStringType& filename, const TProtoStringType& element_name,
    const Message* descriptor, ErrorLocation location,
    const TProtoStringType& message) {
  if (owner_->error_collector_ == NULL) return;

  int line, column;
  if (location == DescriptorPool::ErrorCollector::IMPORT) {
    owner_->source_locations_.FindImport(descriptor, element_name, &line,
                                         &column);
  } else {
    owner_->source_locations_.Find(descriptor, location, &line, &column);
  }
  owner_->error_collector_->AddError(filename, line, column, message);
}

void SourceTreeDescriptorDatabase::ValidationErrorCollector::AddWarning(
    const TProtoStringType& filename, const TProtoStringType& element_name,
    const Message* descriptor, ErrorLocation location,
    const TProtoStringType& message) {
  if (owner_->error_collector_ == NULL) return;

  int line, column;
  if (location == DescriptorPool::ErrorCollector::IMPORT) {
    owner_->source_locations_.FindImport(descriptor, element_name, &line,
                                         &column);
  } else {
    owner_->source_locations_.Find(descriptor, location, &line, &column);
  }
  owner_->error_collector_->AddWarning(filename, line, column, message);
}

// ===================================================================

Importer::Importer(SourceTree* source_tree,
                   MultiFileErrorCollector* error_collector)
    : database_(source_tree),
      pool_(&database_, database_.GetValidationErrorCollector()) {
  pool_.EnforceWeakDependencies(true);
  database_.RecordErrorsTo(error_collector);
}

Importer::~Importer() {}

const FileDescriptor* Importer::Import(const TProtoStringType& filename) {
  return pool_.FindFileByName(filename);
}

void Importer::AddUnusedImportTrackFile(const TProtoStringType& file_name,
                                        bool is_error) {
  pool_.AddUnusedImportTrackFile(file_name, is_error);
}

void Importer::ClearUnusedImportTrackFiles() {
  pool_.ClearUnusedImportTrackFiles();
}


// ===================================================================

SourceTree::~SourceTree() {}

TProtoStringType SourceTree::GetLastErrorMessage() { return "File not found."; }

DiskSourceTree::DiskSourceTree() {}

DiskSourceTree::~DiskSourceTree() {}

static inline char LastChar(const TProtoStringType& str) {
  return str[str.size() - 1];
}

// Given a path, returns an equivalent path with these changes:
// - On Windows, any backslashes are replaced with forward slashes.
// - Any instances of the directory "." are removed.
// - Any consecutive '/'s are collapsed into a single slash.
// Note that the resulting string may be empty.
//
// TODO(kenton):  It would be nice to handle "..", e.g. so that we can figure
//   out that "foo/bar.proto" is inside "baz/../foo".  However, if baz is a
//   symlink or doesn't exist, then things get complicated, and we can't
//   actually determine this without investigating the filesystem, probably
//   in non-portable ways.  So, we punt.
//
// TODO(kenton):  It would be nice to use realpath() here except that it
//   resolves symbolic links.  This could cause problems if people place
//   symbolic links in their source tree.  For example, if you executed:
//     protoc --proto_path=foo foo/bar/baz.proto
//   then if foo/bar is a symbolic link, foo/bar/baz.proto will canonicalize
//   to a path which does not appear to be under foo, and thus the compiler
//   will complain that baz.proto is not inside the --proto_path.
static TProtoStringType CanonicalizePath(TProtoStringType path) {
#ifdef _WIN32
  // The Win32 API accepts forward slashes as a path delimiter even though
  // backslashes are standard.  Let's avoid confusion and use only forward
  // slashes.
  if (HasPrefixString(path, "\\\\")) {
    // Avoid converting two leading backslashes.
    path = "\\\\" + StringReplace(path.substr(2), "\\", "/", true);
  } else {
    path = StringReplace(path, "\\", "/", true);
  }
#endif

  std::vector<TProtoStringType> canonical_parts;
  std::vector<TProtoStringType> parts = Split(
      path, "/", true);  // Note:  Removes empty parts.
  for (int i = 0; i < parts.size(); i++) {
    if (parts[i] == ".") {
      // Ignore.
    } else {
      canonical_parts.push_back(parts[i]);
    }
  }
  TProtoStringType result = Join(canonical_parts, "/");
  if (!path.empty() && path[0] == '/') {
    // Restore leading slash.
    result = '/' + result;
  }
  if (!path.empty() && LastChar(path) == '/' && !result.empty() &&
      LastChar(result) != '/') {
    // Restore trailing slash.
    result += '/';
  }
  return result;
}

static inline bool ContainsParentReference(const TProtoStringType& path) {
  return path == ".." || HasPrefixString(path, "../") ||
         HasSuffixString(path, "/..") || path.find("/../") != TProtoStringType::npos;
}

// Maps a file from an old location to a new one.  Typically, old_prefix is
// a virtual path and new_prefix is its corresponding disk path.  Returns
// false if the filename did not start with old_prefix, otherwise replaces
// old_prefix with new_prefix and stores the result in *result.  Examples:
//   string result;
//   assert(ApplyMapping("foo/bar", "", "baz", &result));
//   assert(result == "baz/foo/bar");
//
//   assert(ApplyMapping("foo/bar", "foo", "baz", &result));
//   assert(result == "baz/bar");
//
//   assert(ApplyMapping("foo", "foo", "bar", &result));
//   assert(result == "bar");
//
//   assert(!ApplyMapping("foo/bar", "baz", "qux", &result));
//   assert(!ApplyMapping("foo/bar", "baz", "qux", &result));
//   assert(!ApplyMapping("foobar", "foo", "baz", &result));
static bool ApplyMapping(const TProtoStringType& filename,
                         const TProtoStringType& old_prefix,
                         const TProtoStringType& new_prefix, TProtoStringType* result) {
  if (old_prefix.empty()) {
    // old_prefix matches any relative path.
    if (ContainsParentReference(filename)) {
      // We do not allow the file name to use "..".
      return false;
    }
    if (HasPrefixString(filename, "/") || IsWindowsAbsolutePath(filename)) {
      // This is an absolute path, so it isn't matched by the empty string.
      return false;
    }
    result->assign(new_prefix);
    if (!result->empty()) result->push_back('/');
    result->append(filename);
    return true;
  } else if (HasPrefixString(filename, old_prefix)) {
    // old_prefix is a prefix of the filename.  Is it the whole filename?
    if (filename.size() == old_prefix.size()) {
      // Yep, it's an exact match.
      *result = new_prefix;
      return true;
    } else {
      // Not an exact match.  Is the next character a '/'?  Otherwise,
      // this isn't actually a match at all.  E.g. the prefix "foo/bar"
      // does not match the filename "foo/barbaz".
      int after_prefix_start = -1;
      if (filename[old_prefix.size()] == '/') {
        after_prefix_start = old_prefix.size() + 1;
      } else if (filename[old_prefix.size() - 1] == '/') {
        // old_prefix is never empty, and canonicalized paths never have
        // consecutive '/' characters.
        after_prefix_start = old_prefix.size();
      }
      if (after_prefix_start != -1) {
        // Yep.  So the prefixes are directories and the filename is a file
        // inside them.
        TProtoStringType after_prefix = filename.substr(after_prefix_start);
        if (ContainsParentReference(after_prefix)) {
          // We do not allow the file name to use "..".
          return false;
        }
        result->assign(new_prefix);
        if (!result->empty()) result->push_back('/');
        result->append(after_prefix);
        return true;
      }
    }
  }

  return false;
}

void DiskSourceTree::MapPath(const TProtoStringType& virtual_path,
                             const TProtoStringType& disk_path) {
  mappings_.push_back(Mapping(virtual_path, CanonicalizePath(disk_path)));
}

DiskSourceTree::DiskFileToVirtualFileResult
DiskSourceTree::DiskFileToVirtualFile(const TProtoStringType& disk_file,
                                      TProtoStringType* virtual_file,
                                      TProtoStringType* shadowing_disk_file) {
  int mapping_index = -1;
  TProtoStringType canonical_disk_file = CanonicalizePath(disk_file);

  for (int i = 0; i < mappings_.size(); i++) {
    // Apply the mapping in reverse.
    if (ApplyMapping(canonical_disk_file, mappings_[i].disk_path,
                     mappings_[i].virtual_path, virtual_file)) {
      // Success.
      mapping_index = i;
      break;
    }
  }

  if (mapping_index == -1) {
    return NO_MAPPING;
  }

  // Iterate through all mappings with higher precedence and verify that none
  // of them map this file to some other existing file.
  for (int i = 0; i < mapping_index; i++) {
    if (ApplyMapping(*virtual_file, mappings_[i].virtual_path,
                     mappings_[i].disk_path, shadowing_disk_file)) {
      if (access(shadowing_disk_file->c_str(), F_OK) >= 0) {
        // File exists.
        return SHADOWED;
      }
    }
  }
  shadowing_disk_file->clear();

  // Verify that we can open the file.  Note that this also has the side-effect
  // of verifying that we are not canonicalizing away any non-existent
  // directories.
  std::unique_ptr<io::ZeroCopyInputStream> stream(OpenDiskFile(disk_file));
  if (stream == NULL) {
    return CANNOT_OPEN;
  }

  return SUCCESS;
}

bool DiskSourceTree::VirtualFileToDiskFile(const TProtoStringType& virtual_file,
                                           TProtoStringType* disk_file) {
  std::unique_ptr<io::ZeroCopyInputStream> stream(
      OpenVirtualFile(virtual_file, disk_file));
  return stream != NULL;
}

io::ZeroCopyInputStream* DiskSourceTree::Open(const TProtoStringType& filename) {
  return OpenVirtualFile(filename, NULL);
}

TProtoStringType DiskSourceTree::GetLastErrorMessage() {
  return last_error_message_;
}

io::ZeroCopyInputStream* DiskSourceTree::OpenVirtualFile(
    const TProtoStringType& virtual_file, TProtoStringType* disk_file) {
  if (virtual_file != CanonicalizePath(virtual_file) ||
      ContainsParentReference(virtual_file)) {
    // We do not allow importing of paths containing things like ".." or
    // consecutive slashes since the compiler expects files to be uniquely
    // identified by file name.
    last_error_message_ =
        "Backslashes, consecutive slashes, \".\", or \"..\" "
        "are not allowed in the virtual path";
    return NULL;
  }

  for (int i = 0; i < mappings_.size(); i++) {
    TProtoStringType temp_disk_file;
    if (ApplyMapping(virtual_file, mappings_[i].virtual_path,
                     mappings_[i].disk_path, &temp_disk_file)) {
      io::ZeroCopyInputStream* stream = OpenDiskFile(temp_disk_file);
      if (stream != NULL) {
        if (disk_file != NULL) {
          *disk_file = temp_disk_file;
        }
        return stream;
      }

      if (errno == EACCES) {
        // The file exists but is not readable.
        last_error_message_ =
            "Read access is denied for file: " + temp_disk_file;
        return NULL;
      }
    }
  }
  last_error_message_ = "File not found.";
  return NULL;
}

io::ZeroCopyInputStream* DiskSourceTree::OpenDiskFile(
    const TProtoStringType& filename) {
  struct stat sb;
  int ret = 0;
  do {
    ret = stat(filename.c_str(), &sb);
  } while (ret != 0 && errno == EINTR);
#if defined(_WIN32)
  if (ret == 0 && sb.st_mode & S_IFDIR) {
    last_error_message_ = "Input file is a directory.";
    return NULL;
  }
#else
  if (ret == 0 && S_ISDIR(sb.st_mode)) {
    last_error_message_ = "Input file is a directory.";
    return NULL;
  }
#endif
  int file_descriptor;
  do {
    file_descriptor = open(filename.c_str(), O_RDONLY);
  } while (file_descriptor < 0 && errno == EINTR);
  if (file_descriptor >= 0) {
    io::FileInputStream* result = new io::FileInputStream(file_descriptor);
    result->SetCloseOnDelete(true);
    return result;
  } else {
    return NULL;
  }
}

}  // namespace compiler
}  // namespace protobuf
}  // namespace google