C/Visual C - Conecciones de red

#include <windows.h>

#include <winhttp.h>

void realizarSolicitudHTTP() {

    HINTERNET hSession = WinHttpOpen(L"Ejemplo de cliente HTTP",

                                      WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,

                                      WINHTTP_NO_PROXY_NAME,

                                      WINHTTP_NO_PROXY_BYPASS, 0);

    HINTERNET hConnect = WinHttpConnect(hSession, L"www.ejemplo.com",

                                        INTERNET_DEFAULT_HTTP_PORT, 0);

    HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"GET",

                                            NULL, NULL,

                                            WINHTTP_NO_REFERER,

                                            WINHTTP_NO_ADDITIONAL_HEADERS,

                                            0);

    WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0,

                       WINHTTP_NO_REQUEST_DATA, 0, 0, 0);

    // Manejar la respuesta aquí...

    WinHttpCloseHandle(hRequest);

    WinHttpCloseHandle(hConnect);

    WinHttpCloseHandle(hSession);

}

#include <libnet.h>

void enviarPaqueteTCP() {

    char errbuf[LIBNET_ERRBUF_SIZE];

    libnet_t *l = libnet_init(LIBNET_RAW4, NULL, errbuf);

    if (l == NULL) {

        fprintf(stderr, "Error al inicializar libnet: %s\n", errbuf);

        return;

    }

    // Construir el paquete TCP aquí...

    uint16_t src_port = 12345; // Puerto de origen

    uint16_t dst_port = 80;     // Puerto de destino

    uint32_t src_ip = libnet_name2addr4(l, "192.168.1.1", LIBNET_RESOLVE); // IP de origen

    uint32_t dst_ip = libnet_name2addr4(l, "192.168.1.2", LIBNET_RESOLVE); // IP de destino

    // Crear el paquete TCP

    libnet_build_tcp(src_port, dst_port,

                     12345, 0,

                     TH_SYN,  // Tipo de paquete

                     32767,    // Tamaño de la ventana

                     0,        // Checksum

                     0,        // Opciones

                     LIBNET_PDU_RAW,

                     l,

                     0);

    // Enviar el paquete

    libnet_write(l);

    libnet_destroy(l);

}