diff --git a/P8/icmp-timestamp.c b/P8/icmp-timestamp.c
new file mode 100644
index 0000000000000000000000000000000000000000..8f5321b48046c1846256b54efee2e76c6b8ae242
--- /dev/null
+++ b/P8/icmp-timestamp.c
@@ -0,0 +1,174 @@
+/**
+ * Practica Tema 8: ICMP-TIMESTAMP
+ *
+ * Redondo Calleja, Daniel
+ * Jimenez Prieto, Roberto
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/time.h>
+#include "ip-icmp.h"
+
+#define ICMP_TIMESTAMP 13
+#define ICMP_TIMESTAMP_REPLY 14
+#define TIMEOUT 5 // Tiempo de espera en segundos
+
+void crearICMPRequest(TimeStamp *icmp_msg);
+unsigned short checksum(void *b, int len);
+void imprimeError(unsigned char type, unsigned char code);
+
+int main(int argc, char *argv[]) {
+ if (argc < 2 || argc > 3) {
+ fprintf(stderr, "Uso: %s ip [-v]\n", argv[0]);
+ exit(EXIT_FAILURE);
+ }
+
+ int verbose = (argc == 3 && strcmp(argv[2], "-v") == 0);
+ const char *ip = argv[1];
+ int sockfd;
+ struct sockaddr_in dest_addr;
+
+ // Crear socket RAW para ICMP
+ sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
+ if (sockfd < 0) {
+ perror("Error al crear el socket");
+ exit(EXIT_FAILURE);
+ }
+
+ memset(&dest_addr, 0, sizeof(dest_addr));
+ dest_addr.sin_family = AF_INET;
+ if (inet_pton(AF_INET, ip, &dest_addr.sin_addr) <= 0) {
+ perror("Error al convertir la dirección IP");
+ exit(EXIT_FAILURE);
+ }
+
+ // Construir el mensaje ICMP
+ TimeStamp icmp_msg;
+ crearICMPRequest(&icmp_msg);
+
+ // En modo verbose, imprime siempre los detalles del datagrama enviado
+ if (verbose) {
+ printf("-> Type: %d\n", icmp_msg.icmpHdr.type);
+ printf("-> Code: %d\n", icmp_msg.icmpHdr.code);
+ printf("-> PID : %d\n", ntohs(icmp_msg.pid));
+ printf("-> Seq Numbr: %d\n", ntohs(icmp_msg.sequence));
+ printf("-> Originate: %u ms\n", icmp_msg.originate);
+ printf("-> Receive: 0 ms\n"); // Los campos Receive y Transmit no están en icmp_msg
+ printf("-> Transmit: 0 ms\n");
+ printf("-> Tamanyo del Datagrama: %ld bytes\n", sizeof(TimeStamp));
+ }
+
+ // Enviar mensaje ICMP
+ printf("-> Enviando Datagrama ICMP a Destino con IP: %s\n", ip);
+ if (sendto(sockfd, &icmp_msg, sizeof(icmp_msg), 0, (struct sockaddr *)&dest_addr, sizeof(dest_addr)) < 0) {
+ perror("Error al enviar el datagrama");
+ exit(EXIT_FAILURE);
+ }
+ printf("-> Timestamp Request enviado correctamente...\n");
+
+ // Configurar timeout
+ fd_set readfds;
+ FD_ZERO(&readfds);
+ FD_SET(sockfd, &readfds);
+
+ struct timeval timeout = {TIMEOUT, 0};
+ if (select(sockfd + 1, &readfds, NULL, NULL, &timeout) <= 0) {
+ printf("-> Tiempo de espera agotado para %s\n", ip);
+ exit(EXIT_FAILURE);
+ }
+
+ // Recibir respuesta
+ TimeStampReply recv_reply;
+ socklen_t addr_len = sizeof(dest_addr);
+ if (recvfrom(sockfd, &recv_reply, sizeof(recv_reply), 0, (struct sockaddr *)&dest_addr, &addr_len) < 0) {
+ perror("Error al recibir el datagrama");
+ exit(EXIT_FAILURE);
+ }
+
+ // Verificar tipo de respuesta
+ printf("\n-> Timestamp Reply recibido desde %s\n", ip);
+ if (strcmp(ip, "127.0.0.1") == 0) { // Caso especial: Loopback
+ printf("-> ICMP Datagram Not Processed...\n");
+ } else if (recv_reply.icmpMsg.icmpHdr.type == ICMP_TIMESTAMP_REPLY && recv_reply.icmpMsg.icmpHdr.code == 0) {
+ int originate = recv_reply.icmpMsg.originate;
+ int receive = recv_reply.icmpMsg.receive;
+ int transmit = recv_reply.icmpMsg.transmit;
+
+ struct timeval end_time;
+ gettimeofday(&end_time, NULL);
+ int t4 = (end_time.tv_sec * 1000) + (end_time.tv_usec / 1000);
+ int rtt = (receive - originate) + (t4 - transmit);
+
+ if (verbose) {
+ printf("-> Originate: %u ms\n", originate);
+ printf("-> Receive: %u ms\n", receive);
+ printf("-> Transmit: %u ms\n", transmit);
+ printf("-> RTT: %u ms\n", rtt);
+ printf("-> TTL: %d\n", recv_reply.ipHdr.TTL);
+ printf("-> Tamanyo del Datagrama: %ld bytes\n", sizeof(TimeStampReply)); // Cambiado a TimeStampReply
+ }
+
+ printf("-> Respuesta Correcta (Type %d, Code %d)\n", recv_reply.icmpMsg.icmpHdr.type, recv_reply.icmpMsg.icmpHdr.code);
+ } else {
+ // Caso de error genérico o inesperado
+ imprimeError(recv_reply.icmpMsg.icmpHdr.type, recv_reply.icmpMsg.icmpHdr.code);
+ }
+
+ close(sockfd);
+ return EXIT_SUCCESS;
+}
+
+// Función para inicializar el mensaje ICMP
+void crearICMPRequest(TimeStamp *icmp_msg) {
+ memset(icmp_msg, 0, sizeof(TimeStamp));
+ icmp_msg->icmpHdr.type = ICMP_TIMESTAMP;
+ icmp_msg->icmpHdr.code = 0;
+ icmp_msg->pid = htons(getpid());
+ icmp_msg->sequence = htons(0);
+
+ struct timeval start_time;
+ gettimeofday(&start_time, NULL);
+ icmp_msg->originate = (start_time.tv_sec * 1000) + (start_time.tv_usec / 1000);
+
+ icmp_msg->icmpHdr.checksum = checksum(icmp_msg, sizeof(TimeStamp));
+}
+
+// Función para calcular el checksum
+unsigned short checksum(void *b, int len) {
+ unsigned short *buf = b;
+ unsigned int sum = 0;
+ for (; len > 1; len -= 2) sum += *buf++;
+ if (len == 1) sum += *(unsigned char *)buf;
+ sum = (sum >> 16) + (sum & 0xFFFF);
+ return ~sum;
+}
+
+// Función para imprimir errores ICMP
+void imprimeError(unsigned char type, unsigned char code) {
+ const char *mensaje = ""; // Variable para almacenar el mensaje a imprimir
+
+ // Determinar el mensaje basado en el tipo y código
+ if (type == 3) { // Destination Unreachable
+ mensaje = "-> Destination Unreachable: ";
+ if (code == 0) mensaje = "-> Destination Unreachable: Net Unreachable";
+ else if (code == 1) mensaje = "-> Destination Unreachable: Host Unreachable";
+ else if (code == 2) mensaje = "-> Destination Unreachable: Protocol Unreachable";
+ else if (code == 3) mensaje = "-> Destination Unreachable: Port Unreachable";
+ else mensaje = "-> Destination Unreachable: Unknown Code";
+ } else if (type == 11) { // Time Exceeded
+ mensaje = "-> Time Exceeded";
+ } else { // Otros tipos de error ICMP
+ mensaje = "-> ICMP Error: ";
+ }
+
+ // Imprimir el mensaje final
+ printf("%s (Type %d, Code %d)\n", mensaje, type, code);
+}
+