Networking Protocol Header

Various protocols like TCP, UDP, IP, IPSec, HTTPs etc have their own header. Following program can be extended to create full protocol header.

Write a C program to generate protocol header with following set of parameters into it:

•  First parameter is Source IP Address
•  Second parameter is Destination IP Address
•  Third parameter is total number of characters present in input.txt file.

#include<stdio.h>

#include<conio.h>

int main()
{

FILE *input,*out;
int c,counter=0;
//Source Add
char source[]="192.168.1.1";
//Destination Add
char dest[]="192.168.1.20";

input= fopen("input.txt","r");
out=fopen("output.txt","w");

if(input==NULL){
printf("Input File Not found");
}
else if(out==NULL){
printf("Output file not Created");
}
else{
//Counting No of charecter in files
do{
c=getc(input);
counter++;
}while(c!=EOF);

counter= counter-1;
//Generatting Headers

fprintf(out,"%s,%s,%d",source,dest,counter);
printf("Header generated Successfully.\nCheck output.txt file.");

fclose(input);
fclose(out);

return 0;
}
}


Output of program:

Header generated Successfully.
Check output.txt file.