PIM_Config.c

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/************************************************************************************
* Copyright (C) 2020                                                               *
* TETCOS, Bangalore. India                                                         *
*                                                                                  *
* Tetcos owns the intellectual property rights in the Product and its content.     *
* The copying, redistribution, reselling or publication of any or all of the       *
* Product or its content without express prior written consent of Tetcos is        *
* prohibited. Ownership and / or any other right relating to the software and all  *
* intellectual property rights therein shall remain at all times with Tetcos.      *
*                                                                                  *
* Author:    Shashi Kant Suman                                                     *
*                                                                                  *
* ---------------------------------------------------------------------------------*/
 
#include "main.h"
#include "List.h"
#include "IP.h"
#include "PIM_SM.h"
#include "NetSim_utility.h"
 
static void create_multicast_group_for_all(NETSIM_IPAddress g, NETSIM_IPAddress r)
{
    NETSIM_ID i;
    for (i = 0; i < NETWORK->nDeviceCount; i++)
    {
        if (isRouter(i + 1) &&
            GET_IP_DEVVAR(i + 1)->isPIMConfigured)
        {
            create_group(i + 1, g, r);
        }
    }
}
 
void configure_PIM()
{
    FILE* fp;
    char p[BUFSIZ];
    sprintf(p, "%s%s%s", pszIOPath, pathSeperator, "PIM_Config.txt");
    fp = fopen(p, "r");
    if (!fp)
    {
        perror(p);
        return;
    }
    char buf[BUFSIZ];
    while (fgets(buf, BUFSIZ, fp))
    {
        char* s = buf;
        s = lskip(s);
 
        if (*s == '#')
            continue; //Comment line
        if (*s == 0 || *s == '\n')
            continue; //Empty line
 
        rstrip(s);
 
        char* g = NULL;
        char* r = NULL;
        g = s;
        while (s)
        {
            if (*s == ',')
            {
                *s = 0;
                r = s + 1;
                s++;
                break;
            }
            s++;
        }
        r = s;
        while (s)
        {
            if (*s == ',')
            {
                *s = 0;
                //Ignore extra
                break;
            }
            s++;
        }
        if (!g || !r)
        {
            fnNetSimError("Format of PIM_Config file is not correct. It must be \"GROUP_ADDR,RP_ADDR,\"");
            continue;
        }
 
        NETSIM_IPAddress gip = STR_TO_IP4(g);
        NETSIM_IPAddress rip = STR_TO_IP4(r);
 
        create_multicast_group_for_all(gip, rip);
    }
}