/*
         2000 .[.I.m.p.e.r.f.e.c.t.i.o.n.]. 2000

        Imperfection Security Team presents range.
        A tool that outputs every IP per IP range.
        A gift from shake (shake@linuxstart.com)
        Usage: ./range 127.0.0.0 127.2.0.255 >file

        Hellos: unknown, dayve, syntax, tom, blitz,
   justin, vicci, wolf, punish, kindred, alg.

  Can be used with stdin scanners, or other fine tools.

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

void usage(void) {
    fprintf(stderr, "\n.[.I.m.p.e.r.f.e.c.t.i.o.n.].\n");
    fprintf(stderr, "imp-range.c (v1.0) by shake\n");
    fprintf(stderr, "Echos every IP in a specified range.\n\n");
    fprintf(stderr, "Usage:\t./range <LowerIpRange> <HigherIpRange>\n");
    fprintf(stderr, "E.G.:\t./range 3.1.33.7 3.1.35.255 >ipdb.txt\n\n");
    fflush(stderr);
}

int main(int argc, char *argv[])
{
    char *lowhost, *hihost;
    
    /* option parsing */
    unsigned int la, lb, lc, ld, ln;
    unsigned int ha, hb, hc, hd, hn;
    unsigned int laddr[4], haddr[4];

    if (argc != 3) {
        usage();
        return 1;
    }

    lowhost = argv[1];
    hihost  = argv[2];
    
    ln=sscanf(lowhost, "%u.%u.%u.%u", &la, &lb, &lc, &ld);
    hn=sscanf(hihost, "%u.%u.%u.%u", &ha, &hb, &hc, &hd);

    if (ln != 4 || hn != 4) {
        fprintf(stderr, "WTF KIND OF IP ADDRESS IS THAT?!?!? (%s :: %s)", lowhost, hihost);
        return 1;
    }

    laddr[0] = la; haddr[0] = ha;
    laddr[1] = lb; haddr[1] = hb;
    laddr[2] = lc; haddr[2] = hc;
    laddr[3] = ld; haddr[3] = hd;

    while (laddr[0] <= haddr[0]) {
        while (laddr[1] <= haddr[1]) {
            while (laddr[2] <= haddr[2]) {
                if ((const int)haddr[3] == 255) {
                    while ((const int)laddr[3] <= 255) { 
                        /* output class c's .. */
                        printf("%u.%u.%u.%u\n", laddr[0], laddr[1], laddr[2], laddr[3]);
                        ++laddr[3];
                    }
                    fflush(stdout);
                }
                else if (laddr[3] <= haddr[3]) {
                    while (laddr[3] <= haddr[3]) {
                        printf("%u.%u.%u.%u\n", laddr[0], laddr[1], laddr[2], laddr[3]);
                        ++laddr[3];
                    }
                }
                laddr[3]=0;
                ++laddr[2];
            }
            laddr[2]=0;
            ++laddr[1];
        }
        laddr[1]=0;
        ++laddr[0];
    }

    fflush(stdout);
    return 0;
}