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Commit 4cd12d35 authored by danredo's avatar danredo
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/**
* 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, local_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;
dest_addr.sin_port = 0; // Inicializar sin_port
if (inet_pton(AF_INET, ip, &dest_addr.sin_addr) <= 0) {
perror("Error al convertir la dirección IP");
close(sockfd);
exit(EXIT_FAILURE);
}
// Asociar socket a la dirección local
memset(&local_addr, 0, sizeof(local_addr));
local_addr.sin_family = AF_INET;
local_addr.sin_addr.s_addr = INADDR_ANY;
local_addr.sin_port = 0;
if (bind(sockfd, (struct sockaddr *)&local_addr, sizeof(local_addr)) < 0) {
perror("Error al asociar el socket a la dirección local");
close(sockfd);
exit(EXIT_FAILURE);
}
// Construir el mensaje ICMP
TimeStamp icmp_msg;
crearICMPRequest(&icmp_msg);
// En modo verbose, imprime 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", icmp_msg.pid);
printf("-> Seq Numbr: %d\n", ntohs(icmp_msg.sequence));
printf("-> Originate: %u ms\n", icmp_msg.originate);
printf("-> Receive: %u ms\n", icmp_msg.receive);
printf("-> Transmit: %u ms\n", icmp_msg.transmit);
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");
close(sockfd);
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};
int sel = select(sockfd + 1, &readfds, NULL, NULL, &timeout);
if (sel < 0) {
perror("Error en select");
close(sockfd);
exit(EXIT_FAILURE);
} else if (sel == 0) {
printf("-> Tiempo de espera agotado para %s\n", ip);
close(sockfd);
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");
close(sockfd);
exit(EXIT_FAILURE);
}
// Verificar tipo de respuesta
printf("\n-> Timestamp Reply recibido desde %s\n", ip);
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));
}
printf("-> Respuesta Correcta (Type %d, Code %d)\n", recv_reply.icmpMsg.icmpHdr.type, recv_reply.icmpMsg.icmpHdr.code);
} else if (recv_reply.icmpMsg.icmpHdr.type == 3){
imprimeError(recv_reply.icmpMsg.icmpHdr.type, recv_reply.icmpMsg.icmpHdr.code);
}else {
printf("-> ICMP Datagram Not Processed...\n");
}
close(sockfd);
return EXIT_SUCCESS;
}
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 = 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 = 0; // Inicializar el campo checksum a 0.
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; // Paso 4: Acumulador inicializado a 0.
// Paso 2: Calcular el número de palabras de 16 bits.
int palabras = len / 2;
// Paso 5: Recorrer el datagrama sumando palabras de 16 bits.
while (palabras > 0) {
sum += *buf++; // Sumar la palabra actual al acumulador.
palabras--; // Reducir el contador de palabras.
}
// Sumar las partes alta y baja del acumulador (1ª vez).
sum = (sum >> 16) + (sum & 0xFFFF);
// Sumar nuevamente las partes alta y baja del acumulador (2ª vez).
sum += (sum >> 16);
// Complemento a uno.
return (unsigned short)(~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
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 if (code == 4) mensaje = "-> Destination Unreachable: Fragmentation Needed";
else if (code == 5) mensaje = "-> Destination Unreachable: Source Route Failed";
else if (code == 6) mensaje = "-> Destination Unreachable: Destination Network Unknown";
else if (code == 7) mensaje = "-> Destination Unreachable: Destination Host Unknown";
else if (code == 8) mensaje = "-> Destination Unreachable: Source Host Isolated";
else if (code == 11) mensaje = "-> Destination Unreachable: Destination Network Unreachable for Type of Service";
else if (code == 12) mensaje = "-> Destination Unreachable: Destination Host Unreachable for Type of Service";
else if (code == 13) mensaje = "-> Destination Unreachable: Communication Administratively Prohibited";
else if (code == 14) mensaje = "-> Destination Unreachable: Host Precedence Violation";
else if (code == 15) mensaje = "-> Destination Unreachable: Precedence Cutoff in Effect";
else mensaje = "-> Destination Unreachable: Unknown Code";
} else if (type == 5) { // Redirect
if (code == 1) mensaje = "-> Redirect: Redirect for Destination Host";
else if (code == 3) mensaje = "-> Redirect: Redirect for Destination Host Based on Type-of-Service";
else mensaje = "-> Redirect: Unknown Code";
} else if (type == 11) { // Time Exceeded
if (code == 0) mensaje = "-> Time Exceeded: Time-to-Live Exceeded in Transit";
else if (code == 1) mensaje = "-> Time Exceeded: Fragment Reassembly Time Exceeded";
else mensaje = "-> Time Exceeded: Unknown Code";
} else if (type == 12) { // Parameter Problem
if (code == 0) mensaje = "-> Parameter Problem: Pointer indicates the error";
else if (code == 1) mensaje = "-> Parameter Problem: Missing a Required Option";
else if (code == 2) mensaje = "-> Parameter Problem: Bad Length";
else mensaje = "-> Parameter Problem: Unknown Code";
} else { // Otros tipos de error ICMP
mensaje = "-> ICMP Error: ";
}
// Imprimir el mensaje final
printf("%s (Type %d, Code %d)\n", mensaje, type, code);
}
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