int match_cidr(char *addr, char *cidr)
{
        char ip[16];
        char mask[16];
        unsigned int i, j;
        long mask1;
        long mask2;
        struct in_addr inp1,inp2;

        memset(ip,0,sizeof(ip));
        memset(mask,0,sizeof(mask));
        memset(&inp1,0,sizeof(inp1));
        memset(&inp2,0,sizeof(inp2));

        for(i=0;i<strlen(cidr);i++)
        {
                if(cidr[i]=='/') break;
                ip[i] = cidr[i];
        }

        for(j=i+1;j<strlen(cidr);j++) mask[j-i-1] = cidr[j]; mask1 = atol(mask);

        mask2 = 0xffffffff << (32 - mask1);

        inet_aton(addr, (struct in_addr *)&inp1);
        inet_aton(ip,   (struct in_addr *)&inp2);

        return((inp1.s_addr & mask2) == (inp2.s_addr & mask2));
}