Clementine-audio-player-Mac.../3rdparty/google-breakpad/common/linux/file_id.cc

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// Copyright (c) 2006, Google Inc.
// All rights reserved.
//
// 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.
//
// file_id.cc: Return a unique identifier for a file
//
// See file_id.h for documentation
//
#include "common/linux/file_id.h"
#include <arpa/inet.h>
#include <assert.h>
#include <elf.h>
#include <fcntl.h>
#if defined(__ANDROID__)
#include "client/linux/android_link.h"
#else
#include <link.h>
#endif
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include <algorithm>
#include "common/linux/linux_libc_support.h"
#include "third_party/lss/linux_syscall_support.h"
namespace google_breakpad {
FileID::FileID(const char* path) {
strncpy(path_, path, sizeof(path_));
}
struct ElfClass32 {
typedef Elf32_Ehdr Ehdr;
typedef Elf32_Shdr Shdr;
static const int kClass = ELFCLASS32;
};
struct ElfClass64 {
typedef Elf64_Ehdr Ehdr;
typedef Elf64_Shdr Shdr;
static const int kClass = ELFCLASS64;
};
// These three functions are also used inside the crashed process, so be safe
// and use the syscall/libc wrappers instead of direct syscalls or libc.
template<typename ElfClass>
static void FindElfClassTextSection(const char *elf_base,
const void **text_start,
int *text_size) {
typedef typename ElfClass::Ehdr Ehdr;
typedef typename ElfClass::Shdr Shdr;
assert(elf_base);
assert(text_start);
assert(text_size);
assert(my_strncmp(elf_base, ELFMAG, SELFMAG) == 0);
const char* text_section_name = ".text";
int name_len = my_strlen(text_section_name);
const Ehdr* elf_header = reinterpret_cast<const Ehdr*>(elf_base);
assert(elf_header->e_ident[EI_CLASS] == ElfClass::kClass);
const Shdr* sections =
reinterpret_cast<const Shdr*>(elf_base + elf_header->e_shoff);
const Shdr* string_section = sections + elf_header->e_shstrndx;
const Shdr* text_section = NULL;
for (int i = 0; i < elf_header->e_shnum; ++i) {
if (sections[i].sh_type == SHT_PROGBITS) {
const char* section_name = (char*)(elf_base +
string_section->sh_offset +
sections[i].sh_name);
if (!my_strncmp(section_name, text_section_name, name_len)) {
text_section = &sections[i];
break;
}
}
}
if (text_section != NULL && text_section->sh_size > 0) {
*text_start = elf_base + text_section->sh_offset;
*text_size = text_section->sh_size;
}
}
static bool FindElfTextSection(const void *elf_mapped_base,
const void **text_start,
int *text_size) {
assert(elf_mapped_base);
assert(text_start);
assert(text_size);
const char* elf_base =
static_cast<const char*>(elf_mapped_base);
const ElfW(Ehdr)* elf_header =
reinterpret_cast<const ElfW(Ehdr)*>(elf_base);
if (my_strncmp(elf_base, ELFMAG, SELFMAG) != 0)
return false;
if (elf_header->e_ident[EI_CLASS] == ELFCLASS32) {
FindElfClassTextSection<ElfClass32>(elf_base, text_start, text_size);
} else if (elf_header->e_ident[EI_CLASS] == ELFCLASS64) {
FindElfClassTextSection<ElfClass64>(elf_base, text_start, text_size);
} else {
return false;
}
return true;
}
// static
bool FileID::ElfFileIdentifierFromMappedFile(void* base,
uint8_t identifier[kMDGUIDSize])
{
const void* text_section = NULL;
int text_size = 0;
bool success = false;
if (FindElfTextSection(base, &text_section, &text_size) && (text_size > 0)) {
my_memset(identifier, 0, kMDGUIDSize);
const uint8_t* ptr = reinterpret_cast<const uint8_t*>(text_section);
const uint8_t* ptr_end = ptr + std::min(text_size, 4096);
while (ptr < ptr_end) {
for (unsigned i = 0; i < kMDGUIDSize; i++)
identifier[i] ^= ptr[i];
ptr += kMDGUIDSize;
}
success = true;
}
return success;
}
bool FileID::ElfFileIdentifier(uint8_t identifier[kMDGUIDSize]) {
int fd = open(path_, O_RDONLY);
if (fd < 0)
return false;
struct stat st;
if (fstat(fd, &st) != 0) {
close(fd);
return false;
}
void* base = mmap(NULL, st.st_size,
PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
close(fd);
if (base == MAP_FAILED)
return false;
bool success = ElfFileIdentifierFromMappedFile(base, identifier);
munmap(base, st.st_size);
return success;
}
// static
void FileID::ConvertIdentifierToString(const uint8_t identifier[kMDGUIDSize],
char* buffer, int buffer_length) {
uint8_t identifier_swapped[kMDGUIDSize];
// Endian-ness swap to match dump processor expectation.
memcpy(identifier_swapped, identifier, kMDGUIDSize);
uint32_t* data1 = reinterpret_cast<uint32_t*>(identifier_swapped);
*data1 = htonl(*data1);
uint16_t* data2 = reinterpret_cast<uint16_t*>(identifier_swapped + 4);
*data2 = htons(*data2);
uint16_t* data3 = reinterpret_cast<uint16_t*>(identifier_swapped + 6);
*data3 = htons(*data3);
int buffer_idx = 0;
for (unsigned int idx = 0;
(buffer_idx < buffer_length) && (idx < kMDGUIDSize);
++idx) {
int hi = (identifier_swapped[idx] >> 4) & 0x0F;
int lo = (identifier_swapped[idx]) & 0x0F;
if (idx == 4 || idx == 6 || idx == 8 || idx == 10)
buffer[buffer_idx++] = '-';
buffer[buffer_idx++] = (hi >= 10) ? 'A' + hi - 10 : '0' + hi;
buffer[buffer_idx++] = (lo >= 10) ? 'A' + lo - 10 : '0' + lo;
}
// NULL terminate
buffer[(buffer_idx < buffer_length) ? buffer_idx : buffer_idx - 1] = 0;
}
} // namespace google_breakpad