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#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
unsigned short in_cksum(unsigned short *addr, int len)
{
register int sum = 0;
u_short answer = 0;
register u_short *w = addr;
register int nleft = len;
while (nleft > 1)
{
sum += *w++;
nleft -= 2;
}
if (nleft == 1)
{
*(u_char *) (&answer) = *(u_char *) w;
sum += answer;
}
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
answer = ~sum;
return (answer);
}
int main(){
int sock, optval,test;
int i;
char *packet, *buffer;
struct ip *hip;
struct icmp * hicmp;
struct sockaddr_in peer;
struct sockaddr_in mine;
packet = (char *) malloc(sizeof(struct ip) + sizeof(struct icmp)
);
buffer = (char *) malloc(sizeof(struct ip) + sizeof(struct icmp)
);
hip = (struct ip *) packet;
hicmp = (struct icmp *) (packet + sizeof(struct ip));
peer.sin_family = AF_INET;
peer.sin_addr.s_addr = inet_addr("19.54.154.14");
mine.sin_family=AF_INET;
mine.sin_addr.s_addr = inet_addr(GetMyIp());
hip->ip_hl = 5;
hip->ip_v = 4;
hip->ip_tos = 0;
hip->ip_len = sizeof(struct ip) + sizeof(struct icmp);
hip->ip_id = htons(getuid());
hip->ip_ttl = 255;
hip->ip_src = peer.sin_addr;
hip->ip_dst = mine.sin_addr;
printf("len : %d\n",hip->ip_len);
sock = socket(AF_INET,SOCK_RAW,IPPROTO_ICMP);
setsockopt(sock,IPPROTO_IP,IP_HDRINCL,&optval,sizeof(int));
hicmp->icmp_type = ICMP_ECHO;
hicmp->icmp_code = 0;
hicmp->icmp_cksum = 0;
hicmp->icmp_cksum = in_cksum((unsigned short *)hicmp,sizeof(struct icmp)
);
hip->ip_sum = in_cksum((unsigned short *)hip, sizeof(struct ip));
for ( i=0; i < hip->ip_len;i++)
printf("%.2X ",*(packet+i));
test=sendto(sock,packet,hip->ip_len,0,(struct sockaddr *)&peer,sizeof(struct sockaddr));
if (test != hip->ip_len)
printf("A envoyé %d octets au lieu de %d octects
\n",test,hip->ip_len);
if (test <= 0)
perror("Erreur sendto()");
test= recvfrom(sock,buffer,sizeof(struct ip)+sizeof(struct icmp),0,(struct sockaddr *)&peer,sizeof(struct sockaddr));
if (test == (sizeof(struct ip)+sizeof(struct icmp)))
printf("Received the ECHO REPLY\n");
for (i = 0; i <= (sizeof(struct ip)+sizeof(struct icmp));i++)
printf("%.2X ",*(packet+i));
printf("\n");
close(sock);
free(packet);
free(buffer);
return 0;
}
ZUL |
