serenity/Userland/Utilities/lsusb.cpp

/*
 * Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <AK/ByteBuffer.h>
#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/LexicalPath.h>
#include <AK/String.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/DirIterator.h>
#include <LibCore/File.h>
#include <stdio.h>
#include <unistd.h>

int main(int argc, char** argv)
{
    if (pledge("stdio rpath", nullptr) < 0) {
        perror("pledge");
        return 1;
    }

    if (unveil("/proc/bus/usb", "r") < 0) {
        perror("unveil");
        return 1;
    }

    if (unveil(nullptr, nullptr) < 0) {
        perror("unveil");
        return 1;
    }

    Core::ArgsParser args;
    args.set_general_help("List USB devices.");
    args.parse(argc, argv);

    Core::DirIterator usb_devices("/proc/bus/usb", Core::DirIterator::SkipDots);

    while (usb_devices.has_next()) {
        auto full_path = LexicalPath(usb_devices.next_full_path());

        auto proc_usb_device = Core::File::construct(full_path.string());
        auto bus_id = proc_usb_device->filename().split('/').last();
        if (!proc_usb_device->open(Core::OpenMode::ReadOnly)) {
            warnln("Failed to open {}: {}", proc_usb_device->name(), proc_usb_device->error_string());
            continue;
        }

        auto contents = proc_usb_device->read_all();
        auto json = JsonValue::from_string(contents);
        VERIFY(json.has_value());

        json.value().as_array().for_each([bus_id](auto& value) {
            auto& device_descriptor = value.as_object();

            auto vendor_id = device_descriptor.get("vendor_id").to_u32();
            auto product_id = device_descriptor.get("product_id").to_u32();

            outln("Device {}: ID {:04x}:{:04x}", bus_id, vendor_id, product_id);
        });
    }

    return 0;
}