uv_loop_t *loop;
uv_udp_t send_socket;
uv_udp_t recv_socket;

int main() {
    loop = uv_default_loop();

    uv_udp_init(loop, &recv_socket);
    struct sockaddr_in recv_addr = uv_ip4_addr("0.0.0.0", 68);
    uv_udp_bind(&recv_socket, recv_addr, 0);
    uv_udp_recv_start(&recv_socket, alloc_buffer, on_read);

    uv_udp_init(loop, &send_socket);
    uv_udp_bind(&send_socket, uv_ip4_addr("0.0.0.0", 0), 0);
    uv_udp_set_broadcast(&send_socket, 1);

    uv_udp_send_t send_req;
    uv_buf_t discover_msg = make_discover_msg(&send_req);

    struct sockaddr_in send_addr = uv_ip4_addr("255.255.255.255", 67);
    uv_udp_send(&send_req, &send_socket, &discover_msg, 1, send_addr, on_send);

    return uv_run(loop, UV_RUN_DEFAULT);
}

void on_read(uv_udp_t *req, ssize_t nread, uv_buf_t buf, struct sockaddr *addr, unsigned flags) {
    if (nread == -1) {
        fprintf(stderr, "Read error %s\n", uv_err_name(uv_last_error(loop)));
        uv_close((uv_handle_t*) req, NULL);
        free(buf.base);
        return;
    }

    char sender[17] = { 0 };
    uv_ip4_name((struct sockaddr_in*) addr, sender, 16);
    fprintf(stderr, "Recv from %s\n", sender);

    // ... DHCP specific code

    free(buf.base);
    uv_udp_recv_stop(req);
}

int main() {
    loop = uv_default_loop();

    struct addrinfo hints;
    hints.ai_family = PF_INET;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;
    hints.ai_flags = 0;

    uv_getaddrinfo_t resolver;
    fprintf(stderr, "irc.freenode.net is... ");
    int r = uv_getaddrinfo(loop, &resolver, on_resolved, "irc.freenode.net", "6667", &hints);

    if (r) {
        fprintf(stderr, "getaddrinfo call error %s\n", uv_err_name(uv_last_error(loop)));
        return 1;
    }
    return uv_run(loop, UV_RUN_DEFAULT);
}

void on_resolved(uv_getaddrinfo_t *resolver, int status, struct addrinfo *res) {
    if (status == -1) {
        fprintf(stderr, "getaddrinfo callback error %s\n", uv_err_name(uv_last_error(loop)));
        return;
    }

    char addr[17] = {'\0'};
    uv_ip4_name((struct sockaddr_in*) res->ai_addr, addr, 16);
    fprintf(stderr, "%s\n", addr);

    uv_connect_t *connect_req = (uv_connect_t*) malloc(sizeof(uv_connect_t));
    uv_tcp_t *socket = (uv_tcp_t*) malloc(sizeof(uv_tcp_t));
    uv_tcp_init(loop, socket);

    connect_req->data = (void*) socket;
    uv_tcp_connect(connect_req, socket, *(struct sockaddr_in*) res->ai_addr, on_connect);

    uv_freeaddrinfo(res);
}

#include <stdio.h>
#include <uv.h>

int main() {
    char buf[512];
    uv_interface_address_t *info;
    int count, i;

    uv_interface_addresses(&info, &count);
    i = count;

    printf("Number of interfaces: %d\n", count);
    while (i--) {
        uv_interface_address_t interface = info[i];

        printf("Name: %s\n", interface.name);
        printf("Internal? %s\n", interface.is_internal ? "Yes" : "No");
        
        if (interface.address.address4.sin_family == AF_INET) {
            uv_ip4_name(&interface.address.address4, buf, sizeof(buf));
            printf("IPv4 address: %s\n", buf);
        }
        else if (interface.address.address4.sin_family == AF_INET6) {
            uv_ip6_name(&interface.address.address6, buf, sizeof(buf));
            printf("IPv6 address: %s\n", buf);
        }

        printf("\n");
    }

    uv_free_interface_addresses(info, count);
    return 0;
}