arp.cpp

/*
 * Copyright (c) 2020, the SerenityOS developers.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 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 HOLDER 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.
 */

#include <AK/JsonObject.h>
#include <AK/String.h>
#include <LibCore/File.h>
#include <stdio.h>

int main()
{
    auto file = Core::File::construct("/proc/net/arp");
    if (!file->open(Core::IODevice::ReadOnly)) {
        fprintf(stderr, "Error: %s\n", file->error_string());
        return 1;
    }

    printf("Address          HWaddress\n");
    auto file_contents = file->read_all();
    auto json = JsonValue::from_string(file_contents);
    ASSERT(json.has_value());
    json.value().as_array().for_each([](auto& value) {
        auto if_object = value.as_object();

        auto ip_address = if_object.get("ip_address").to_string();
        auto mac_address = if_object.get("mac_address").to_string();

        printf("%-15s  ", ip_address.characters());
        printf("%-17s  ", mac_address.characters());
        printf("\n");
    });

    return 0;
}