find ramnit seed

find_seed.c

#include <stdio.h>
#include <string.h>

unsigned long int rand_int_modulus(unsigned long int *ix, unsigned long int modulus) {
    unsigned long int k1;
    k1 = *ix / 127773;
    *ix = 16807 * (*ix - k1 * 127773) - k1 * 2836;
    return *ix % modulus;
}

void next_domain(unsigned long int seed, char* url) {
    unsigned long int domain_len = rand_int_modulus(&seed, 12) + 8;
    unsigned long int i;
    for(i = 0; i < domain_len; i++) {
        url[i] = rand_int_modulus(&seed, 25) + 97;
    }
    url[domain_len] = 0;
}

long int find(char* wanted) {
    char url[21];
    printf("searching %s\n", wanted);
    unsigned long int seed;
    unsigned long int maximum = (unsigned long int)0xFFFFFFFF;
    for(seed = 0; seed < maximum; seed++) {
        next_domain(seed, url);
        if(strcmp(url, wanted) == 0)
            printf("\r-> found key %x\n", (unsigned int)seed); 
        if(seed % (2 << 22) == 0)
            printf("\r%.3f %%", (seed)/(double)maximum);
    }
    printf("\n");
}

long int main (long int argc, char *argv[])
{
    if ( argc != 2 ) 
        printf( "usage: %s hostname (without tld)\n", argv[0] );
    else 
        find(argv[1]);
}