file_id.cc | Explore in Territory

// Copyright 2006 Google LLC
//
// 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 LLC 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.
//
// file_id.cc: Return a unique identifier for a file
//
// See file_id.h for documentation
//

#ifdef HAVE_CONFIG_H
#include <config.h>  // Must come first
#endif

#include "common/linux/file_id.h"

#include <arpa/inet.h>
#include <assert.h>
#include <string.h>

#include <algorithm>
#include <string>

#include "common/linux/elf_gnu_compat.h"
#include "common/linux/elfutils.h"
#include "common/linux/linux_libc_support.h"
#include "common/linux/memory_mapped_file.h"
#include "common/using_std_string.h"
#include "third_party/lss/linux_syscall_support.h"

namespace google_breakpad {
namespace elf {

// Used in a few places for backwards-compatibility.
const size_t kMDGUIDSize = …;

FileID::FileID(const char* path) : … { … }

// ELF note name and desc are 32-bits word padded.
#define NOTE_PADDING(a) …

// These functions are also used inside the crashed process, so be safe
// and use the syscall/libc wrappers instead of direct syscalls or libc.

static bool ElfClassBuildIDNoteIdentifier(const void* section, size_t length,
                                          wasteful_vector<uint8_t>& identifier) { … }

// Attempt to locate a .note.gnu.build-id section in an ELF binary
// and copy it into |identifier|.
static bool FindElfBuildIDNote(const void* elf_mapped_base,
                               wasteful_vector<uint8_t>& identifier) { … }

// Attempt to locate the .text section of an ELF binary and generate
// a simple hash by XORing the first page worth of bytes into |identifier|.
static bool HashElfTextSection(const void* elf_mapped_base,
                               wasteful_vector<uint8_t>& identifier) { … }

// static
bool FileID::ElfFileIdentifierFromMappedFile(const void* base,
                                             wasteful_vector<uint8_t>& identifier) { … }

bool FileID::ElfFileIdentifier(wasteful_vector<uint8_t>& identifier) { … }

// These three functions are not ever called in an unsafe context, so it's OK
// to allocate memory and use libc.
static string bytes_to_hex_string(const uint8_t* bytes, size_t count) { … }

// static
string FileID::ConvertIdentifierToUUIDString(
    const wasteful_vector<uint8_t>& identifier) { … }

// static
string FileID::ConvertIdentifierToString(
    const wasteful_vector<uint8_t>& identifier) { … }

}  // elf
}  // namespace google_breakpad
chromium/third_party/breakpad/breakpad/src/common/linux/file_id.cc
