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Userland: Teach the file utility more about ELF files

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It now shows some useful at-a-glance information about ELF files, like
it does on other *nix systems.
This commit is contained in:
Valtteri Koskivuori 2021-10-18 02:21:44 +03:00 • committed by Andreas Kling
parent efbcfe0498
commit a3b3800cd4
1 changed files with 37 additions and 0 deletions
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37
Userland/Utilities/file.cpp
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@ -10,6 +10,8 @@
#include <LibCore/ArgsParser.h>
#include <LibCore/FileStream.h>
#include <LibCore/MimeData.h>
#include <LibELF/Image.h>
#include <LibELF/Validation.h>
#include <LibGfx/ImageDecoder.h>
#include <stdio.h>
#include <sys/stat.h>
@ -52,6 +54,40 @@ static Optional<String> gzip_details(String description, const String& path)
return String::formatted("{}, {}", description, gzip_details.value());
}
static Optional<String> elf_details(String description, const String& path)
{
auto file_or_error = MappedFile::map(path);
if (file_or_error.is_error())
return {};
auto& mapped_file = *file_or_error.value();
auto elf_data = mapped_file.bytes();
ELF::Image elf_image(elf_data);
if (!elf_image.is_valid())
return {};
String interpreter_path;
if (!ELF::validate_program_headers(*(const ElfW(Ehdr)*)elf_data.data(), elf_data.size(), (const u8*)elf_data.data(), elf_data.size(), &interpreter_path))
return {};
auto& header = *reinterpret_cast<const ElfW(Ehdr)*>(elf_data.data());
auto bitness = header.e_ident[EI_CLASS] == ELFCLASS64 ? "64" : "32";
auto byteorder = header.e_ident[EI_DATA] == ELFDATA2LSB ? "LSB" : "MSB";
bool is_dynamically_linked = !interpreter_path.is_empty();
String dynamic_section = String::formatted(", dynamically linked, interpreter {}", interpreter_path);
return String::formatted("{} {}-bit {} {}, {}, version {} ({}){}",
description,
bitness,
byteorder,
ELF::Image::object_file_type_to_string(header.e_type).value_or("(?)"),
ELF::Image::object_machine_type_to_string(header.e_machine).value_or("(?)"),
header.e_ident[EI_ABIVERSION],
ELF::Image::object_abi_type_to_string(header.e_ident[EI_OSABI]).value_or("(?)"),
is_dynamically_linked ? dynamic_section : "");
}
#define ENUMERATE_MIME_TYPE_DESCRIPTIONS \
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/gzip", "gzip compressed data", gzip_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/javascript", "JavaScript source", description_only) \
@ -63,6 +99,7 @@ static Optional<String> gzip_details(String description, const String& path)
__ENUMERATE_MIME_TYPE_DESCRIPTION("application/x-7z-compressed", "7-Zip archive", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("audio/midi", "MIDI sound", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/blender", "Blender project file", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/elf", "ELF", elf_details) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/ext", "ext filesystem", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/flac", "FLAC audio", description_only) \
__ENUMERATE_MIME_TYPE_DESCRIPTION("extra/iso-9660", "ISO 9660 CD/DVD image", description_only) \