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Utilities: Introduce the ldd utility
This utility lets a user to figure out what are the dependency libraries for an ELF dynamic object, whether it's a dynamically loaded executable or dynamically loaded library.
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Userland/Utilities/ldd.cpp
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151
Userland/Utilities/ldd.cpp
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/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/DeprecatedString.h>
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#include <AK/LexicalPath.h>
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibCore/MappedFile.h>
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#include <LibCore/System.h>
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#include <LibELF/DynamicLinker.h>
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#include <LibELF/DynamicLoader.h>
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#include <LibELF/DynamicObject.h>
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#include <LibELF/Image.h>
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#include <LibELF/Validation.h>
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#include <LibMain/Main.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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static Vector<DeprecatedString> found_libraries;
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static ErrorOr<void> recusively_resolve_all_necessary_libraries(StringView interpreter_path, size_t recursive_iteration_max, size_t recursive_iteration, ELF::DynamicObject& object)
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{
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if (recursive_iteration > recursive_iteration_max)
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return ELOOP;
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Vector<DeprecatedString> libraries;
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object.for_each_needed_library([&libraries](StringView entry) {
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libraries.append(DeprecatedString::formatted("{}", entry));
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});
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for (auto& library_name : libraries) {
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auto possible_library_path = ELF::DynamicLinker::resolve_library(library_name, object);
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if (!possible_library_path.has_value())
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continue;
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auto library_path = LexicalPath::absolute_path(TRY(Core::System::getcwd()), possible_library_path.value());
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if (found_libraries.contains_slow(library_path))
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continue;
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auto file = TRY(Core::MappedFile::map(library_path));
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auto elf_image_data = file->bytes();
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ELF::Image elf_image(elf_image_data);
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if (!elf_image.is_valid()) {
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outln("Shared library is not valid ELF: {}", library_path);
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continue;
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}
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if (!elf_image.is_dynamic()) {
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outln("Shared library is not dynamic loaded object: {}", library_path);
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continue;
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}
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int fd = TRY(Core::System::open(library_path, O_RDONLY));
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auto result = ELF::DynamicLoader::try_create(fd, library_path);
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if (result.is_error()) {
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outln("{}", result.error().text);
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continue;
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}
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auto& loader = result.value();
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if (!loader->is_valid()) {
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outln("{} is not a valid ELF dynamic shared object!", library_path);
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continue;
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}
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RefPtr<ELF::DynamicObject> library_object = loader->map();
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if (!library_object) {
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outln("Failed to map dynamic ELF object {}", library_path);
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continue;
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}
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outln("{} => {}", library_name, library_path);
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recursive_iteration++;
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found_libraries.append(library_path);
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TRY(recusively_resolve_all_necessary_libraries(interpreter_path, recursive_iteration_max, recursive_iteration, *library_object));
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}
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return {};
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio rpath"));
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DeprecatedString path {};
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Optional<size_t> recursive_iteration_max;
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bool force_without_valid_interpreter = false;
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Core::ArgsParser args_parser;
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args_parser.add_option(recursive_iteration_max, "Max library resolving recursion", "max-recursion", 'r', "max recursion-level");
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args_parser.add_option(force_without_valid_interpreter, "Force library resolving on ELF object without valid interpreter", "force-without-valid-interpreter", 'f');
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args_parser.add_positional_argument(path, "ELF path", "path");
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args_parser.parse(arguments);
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path = LexicalPath::absolute_path(TRY(Core::System::getcwd()), path);
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auto file_or_error = Core::MappedFile::map(path);
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if (file_or_error.is_error()) {
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warnln("Unable to map file {}: {}", path, file_or_error.error());
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return -1;
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}
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auto elf_image_data = file_or_error.value()->bytes();
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ELF::Image elf_image(elf_image_data);
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if (!elf_image.is_valid()) {
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warnln("File is not a valid ELF object");
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return -1;
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}
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StringBuilder interpreter_path_builder;
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auto result_or_error = ELF::validate_program_headers(*(const ElfW(Ehdr)*)elf_image_data.data(), elf_image_data.size(), elf_image_data, &interpreter_path_builder);
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if (result_or_error.is_error() || !result_or_error.value()) {
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warnln("Invalid ELF headers");
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return -1;
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}
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auto interpreter_path = interpreter_path_builder.string_view();
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RefPtr<ELF::DynamicObject> object = nullptr;
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if (elf_image.is_dynamic()) {
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if (interpreter_path != "/usr/lib/Loader.so"sv && !force_without_valid_interpreter) {
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warnln("ELF interpreter image is invalid");
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return 1;
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}
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int fd = TRY(Core::System::open(path, O_RDONLY));
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auto result = ELF::DynamicLoader::try_create(fd, path);
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if (result.is_error()) {
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outln("{}", result.error().text);
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return 1;
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}
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auto& loader = result.value();
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if (!loader->is_valid()) {
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outln("{} is not a valid ELF dynamic shared object!", path);
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return 1;
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}
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object = loader->map();
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if (!object) {
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outln("Failed to map dynamic ELF object {}", path);
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return 1;
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}
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TRY(recusively_resolve_all_necessary_libraries(interpreter_path, recursive_iteration_max.value_or(10), 0, *object));
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} else {
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outln("ELF program is not dynamic loaded!");
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return 1;
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}
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return 0;
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}
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