ifconfig.cpp

#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/String.h>
#include <AK/Types.h>
#include <LibCore/CFile.h>
#include <net/if.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/socket.h>

String si_bytes(unsigned bytes)
{
    if (bytes >= GB)
        return String::format("%fGiB", (double)bytes / (double)GB);
    if (bytes >= MB)
        return String::format("%fMiB", (double)bytes / (double)MB);
    if (bytes >= KB)
        return String::format("%fKiB", (double)bytes / (double)KB);
    return String::format("%dB", bytes);
}

int main(int argc, char** argv)
{
    if (argc == 3) {
        String ifname = argv[1];
        auto address = IPv4Address::from_string(argv[2]);

        if (!address.has_value()) {
            fprintf(stderr, "Invalid IPv4 address: '%s'\n", argv[2]);
            return 1;
        }

        int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
        if (fd < 0) {
            perror("socket");
            return 1;
        }

        struct ifreq ifr;
        memset(&ifr, 0, sizeof(ifr));

        strncpy(ifr.ifr_name, ifname.characters(), IFNAMSIZ);
        ifr.ifr_addr.sa_family = AF_INET;
        ((sockaddr_in&)ifr.ifr_addr).sin_addr.s_addr = address.value().to_in_addr_t();

        int rc = ioctl(fd, SIOCSIFADDR, &ifr);
        if (rc < 0) {
            perror("ioctl(SIOCSIFADDR)");
            return 1;
        }
        return 0;
    }

    auto file = CFile::construct("/proc/net/adapters");
    if (!file->open(CIODevice::ReadOnly)) {
        fprintf(stderr, "Error: %s\n", file->error_string());
        return 1;
    }

    auto file_contents = file->read_all();
    auto json = JsonValue::from_string(file_contents).as_array();
    json.for_each([](auto& value) {
        auto if_object = value.as_object();

        auto name = if_object.get("name").to_string();
        auto class_name = if_object.get("class_name").to_string();
        auto mac_address = if_object.get("mac_address").to_string();
        auto ipv4_address = if_object.get("ipv4_address").to_string();
        auto packets_in = if_object.get("packets_in").to_u32();
        auto bytes_in = if_object.get("bytes_in").to_u32();
        auto packets_out = if_object.get("packets_out").to_u32();
        auto bytes_out = if_object.get("bytes_out").to_u32();
        auto mtu = if_object.get("mtu").to_u32();

        printf("%s:\n", name.characters());
        printf("     mac: %s\n", mac_address.characters());
        printf("    ipv4: %s\n", ipv4_address.characters());
        printf("   class: %s\n", class_name.characters());
        printf("      RX: %u packets %u bytes (%s)\n", packets_in, bytes_in, si_bytes(bytes_in).characters());
        printf("      TX: %u packets %u bytes (%s)\n", packets_out, bytes_out, si_bytes(bytes_out).characters());
        printf("     MTU: %u\n", mtu);
        printf("\n");
    });

    return 0;
}