/*
* Switch simulator
*/

#define ADDRESS_MAX      5
#define NUM_PACKETS      1000

#include <stdio.h>
#include <stdlib.h>

void create_traffic (void);

int main(int argc, char **argv) {
  FILE *SEG1;
  FILE *HOSTS;
  int i,j,to,from,to_tmp,from_tmp,bridge;
  int (*bridges)[];

  /* generates ficticious traffic */
  create_traffic();
  
  SEG1  = fopen("switch.dat","r");
  HOSTS = fopen("host.conf","r");
  
  for(i=1;i<=NUM_PACKETS;i++) {
    fscanf(SEG1,"%d %d",&to,&from);
    while(fscanf(HOSTS,"%d %d %d",&from_tmp,&to_tmp,&bridge) != EOF) {
      if (to == to_tmp && from == from_tmp) {
        printf("Traffic from %d to %d routed through %d\n",from,to,bridge);
      }
    }
    rewind(HOSTS);
  }
  
  fclose(SEG1);
  fclose(HOSTS);
  
  return 0;
}

void create_traffic (void) {
  FILE *SEG1 = fopen("switch.dat","w");
  int i;
  int num1,num2;
  for (i=0;i<=NUM_PACKETS;i++) {
    srand(rand());
    num1 = 1 + (rand() % ADDRESS_MAX);
    num2 = 1 + (rand() % ADDRESS_MAX);
    while (num2 == num1 || num2 == 0) {
      num2 = 1 + rand() % ADDRESS_MAX;
    }
    (void) fprintf(SEG1,"%d %d\n",num1,num2);
    fflush(SEG1);  
  }
  fclose(SEG1);
}