Tuesday, 23 July 2013

Simulation of ARP/RARP using client&server


//ARP SERVER
#include<stdio.h>
#include<sys/types.h>
#include<sys/shm.h>
#include<string.h>
main()
{
int shmid, a, i;
char *ptr, *shmptr;
shmid=shmget(3000,10,IPC_CREAT | 0666);
shmptr=shmat(shmid,NULL,0);
ptr=shmptr;
for(i=0;i<3;i++)
{
puts("enter the mac");
scanf("%s",ptr);
a=strlen(ptr);
printf("string length:%d",a);
ptr[a]= ' ' ;
puts("enter ip");
ptr=ptr+a+1;
scanf("%s",ptr);
ptr[a]='\n' ;
ptr= ptr+a+1;
}
ptr[strlen(ptr)]= '\0';
printf("\n ARP table at serverside is=\n%s", shmptr);
shmdt(shmptr);
}

ARP table at serverside is
a.b.c.d 1.2.3.4
e.f.g.h 5.6.7.8
i.j.k.l 9.1.2.3

//ARP CLIENT
#include<stdio.h>
#include<string.h>
#include<sys/types.h>
#include<sys/shm.h>
main()
{
int shmid,a;
char *ptr, *shmptr;
char ptr2[51], ip[12], mac[26];
shmid=shmget(3000,10,0666);
shmptr=shmat(shmid,NULL,0);
puts("the arp table is");
printf("%s",shmptr);
printf("\n1.ARP\n 2.RARP\n 3.EXIT\n");
scanf("%d",&a);
switch(a)
{
case 1:
puts("enter ip address");
scanf("%s",ip);
ptr=strstr(shmptr, ip);
ptr-=8;
sscanf(ptr,"%s%*s",ptr2);
printf("mac addr is %s",ptr2);
break;
case 2:
puts("enter mac addr");
scanf("%s",mac);
ptr=strstr(shmptr, mac);
sscanf(ptr,"%*s%s",ptr2);
printf("%s",ptr2);
break;
case 3:
exit(1);
}
}



SAMPLE INPUT OUTPUT:

the arp table is
a.b.c.d  1.2.3.4
e.f.g.h   5.6.7.8
i.j.k.l     9.1.2.3
1.ARP
2.RARP
3.EXIT
enter your choice: 1
enter ip address: 1.2.3.4
mac addr is a.b.c.d
enter your choice:2
enter mac address: e.f.g.h
ip addr is 5.6.7.8

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