Delete icmp-timestamp.c

P8/icmp-timestamp.c

-/**
- * 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);
-}
-