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| #include "ping.h"
struct hostent * resolve_addr(char * name, unsigned long * p_addr)
{
struct hostent * h = gethostbyname(name);
if (h != NULL)
memcpy(p_addr, h->h_addr_list[0], sizeof(unsigned long));
return h;
}
struct hostent * resolve_computer_addr(unsigned long * p_addr)
{
struct hostent * h = NULL;
char computer_name[100];
if (gethostname(computer_name, sizeof(computer_name)) == 0)
h = resolve_addr(computer_name, p_addr);
return h;
}
unsigned short csum(unsigned short *buf, int nwords)
{
unsigned long sum;
for(sum=0; nwords>0; nwords--)
sum += *buf++;
sum = (sum >> 16) + (sum &0xffff);
sum += (sum >> 16);
return (unsigned short)(~sum);
}
int main(int argc, char **argv)
{
SOCKET s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
if(s == INVALID_SOCKET)
{
perror("socket()");
exit(-1);
}
int sockopt=1;
if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, &sockopt, sizeof(sockopt))==SOCKET_ERROR)
{
perror("setsockopt() IPPROTO_IP:");
exit(-1);
}
struct timeval sockopt2={0};
sockopt2.tv_sec=10;
if(setsockopt(s, SOL_SOCKET, SO_RCVTIMEO,(char*) &sockopt2, sizeof(sockopt2))==SOCKET_ERROR)
{
perror("setsockopt() SOL_SOQUET:");
exit(-1);
}
char *buf;
unsigned int len = sizeof(IPHEADER)+sizeof(ICMPPINGMESSAGE);
buf=malloc(len);
if(buf==NULL)
{
perror("malloc(): ");
exit(-1);
}
unsigned long ip_source;
unsigned char tmp[4]={78, 122, 225, 103};
unsigned char tmp2[4]={192., 168, 1, 42};
if(resolve_computer_addr(&ip_source)==NULL)
{
perror("resolve_computer_addr(): ");
ip_source=(unsigned long) tmp;
}
unsigned long ip_dest;
if(resolve_addr(REMOTE, &ip_dest)==NULL)
{
perror("resolve_addr(): ");
ip_dest=(unsigned long) tmp2;
}
SOCKADDR_IN remote={0};
int remote_len = (int)sizeof(remote);
IPHEADER ip;
ICMPPINGMESSAGE icmp;
ip.iph_ver=4;
ip.iph_ihl=5;
ip.iph_tos=0;
ip.iph_len=htons(len);
ip.iph_ident=htons(1);
ip.iph_flag=0;
ip.iph_offset=0;
ip.iph_ttl=200;
ip.iph_protocol=IPPROTO_ICMP;
ip.iph_chksum=0;
ip.iph_sourceip=ip_source;
ip.iph_destip=ip_dest;
ip.iph_chksum=csum((unsigned short*)&ip, sizeof(ip)+1);
struct timeval tv;
icmp.type=ICMP_ECHO_REQ;
icmp.code=0;
icmp.somme=0;
icmp.id=(char)getpid();
icmp.timestamp=gettimeofday(&tv, NULL);
icmp.somme=csum((unsigned short*)&icmp, sizeof(icmp));
memcpy(buf, &ip, sizeof(ip));
memcpy(buf+sizeof(ip), &icmp, sizeof(icmp));
remote.sin_family=AF_INET;
remote.sin_addr.s_addr=ip_dest;
printf("Envoie de la requete a : %s avec %hu octet\n", inet_ntoa(remote.sin_addr), len);
int n=0;
if(n=sendto(s, buf, len, 0, (SOCKADDR*)&remote, sizeof(remote))==SOCKET_ERROR)
{
perror("sendto(): ");
exit(-1);
}
printf("taille ,n=%d\n", n);perror("error");
printf("Attente de réponse\n");
if(recvfrom(s, buf, len, 0, (SOCKADDR*)&remote, &remote_len)==SOCKET_ERROR)
{
perror("timeout ou recvfrom(): ");
exit(-1);
}
struct timeval tv2;
int ping = gettimeofday(&tv, NULL) - icmp.timestamp;
memset(&ip, 0, sizeof(ip));
memset(&icmp, 0, sizeof(icmp));
memcpy(&ip, buf, sizeof(ip));
memcpy(&icmp, buf+(ip.iph_ihl*4), sizeof(icmp));
if(icmp.id!=getpid())
{
printf("Paquet different\n");
exit(-1);
}
if(icmp.type==ICMP_ECHO_REQ)
printf("Réponse recu en %lu ms\n",ping );
else
printf("Réponse inatendue !\n");
free(buf);
closesocket(s);
return 0;
} |
