package/network/iproute2/ipnm2nwbc.c

   1 // --- T2-COPYRIGHT-NOTE-BEGIN ---
   2 // T2 SDE: package/*/iproute2/ipnm2nwbc.c
   3 // Copyright (C) 2004 - 2023 The T2 SDE Project
   4 // Copyright (C) 1998 - 2003 ROCK Linux Project
   5 //
   6 // This Copyright note is generated by scripts/Create-CopyPatch,
   7 // more information can be found in the files COPYING and README.
   8 //
   9 // This program is free software; you can redistribute it and/or modify
  10 // it under the terms of the GNU General Public License version 2.
  11 // --- T2-COPYRIGHT-NOTE-END ---
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15
  16 int getbits(int n) {
  17         int rc=0;
  18         while (n) {
  19                 if (n&1) rc++;
  20                 n = n >> 1;
  21         }
  22         return rc;
  23 }
  24
  25 int setbits(int n) {
  26         int rc=0;
  27         while (n--) {
  28                 rc = (rc>>1)|(1<<7);
  29         }
  30         return rc;
  31 }
  32
  33 int main(int argc, char ** argv) {
  34         int ip[4],nm[4],nw[4],bc[4],c;
  35         int verbose=0,nmbits=0,n;
  36
  37         if ( argc > 1 && !strcmp(argv[1],"-v") ) verbose=1;
  38
  39         if ( argc == 3+verbose &&
  40              sscanf(argv[1+verbose],"%d.%d.%d.%d",ip,ip+1,ip+2,ip+3) == 4 &&
  41              sscanf(argv[2+verbose],"%d.%d.%d.%d",nm,nm+1,nm+2,nm+3) == 4 ) {
  42                 nmbits=getbits(nm[0])+getbits(nm[1])+
  43                        getbits(nm[2])+getbits(nm[3]);
  44         } else if ( argc == 2+verbose && sscanf(argv[1+verbose],
  45                     "%d.%d.%d.%d/%d",ip,ip+1,ip+2,ip+3,&nmbits) == 5 ) {
  46                 n=nmbits;
  47                 if (n>0) { nm[0]=setbits(n>8?8:n); n-=8; } else nm[0]=0;
  48                 if (n>0) { nm[1]=setbits(n>8?8:n); n-=8; } else nm[1]=0;
  49                 if (n>0) { nm[2]=setbits(n>8?8:n); n-=8; } else nm[2]=0;
  50                 if (n>0) { nm[3]=setbits(n>8?8:n); n-=8; } else nm[3]=0;
  51         } else {
  52                 fprintf(stderr,"\n"
  53                     "IP and Netmask  to  Network and Broadcast  converter.\n"
  54                     "(C) under GPL, 1999 Clifford Wolf\n\n"
  55                     "Usage: %s [-v] <IP> <Netmask>\n"
  56                     "       %s [-v] <IP>/<Mask>\n\n"
  57                     "Examples: %s -v 195.170.70.72/25\n"
  58                     "          %s 195.170.70.72 255.255.255.128\n\n",
  59                     argv[0],argv[0],argv[0],argv[0]);
  60                 return 1;
  61         }
  62
  63         for (c=0; c<4; c++) {
  64                 nw[c]=ip[c]&nm[c];
  65                 bc[c]=nw[c]|(255&~nm[c]);
  66         }
  67
  68         if ( verbose ) {
  69                 printf("Network:   %d.%d.%d.%d / %d\n",
  70                         nw[0],nw[1],nw[2],nw[3],nmbits);
  71                 printf("Netmask:   %d.%d.%d.%d\n",
  72                         nm[0],nm[1],nm[2],nm[3]);
  73                 printf("Broadcast: %d.%d.%d.%d\n",
  74                         bc[0],bc[1],bc[2],bc[3]);
  75         } else {
  76                 printf("%d.%d.%d.%d %d.%d.%d.%d\n",nw[0],nw[1],
  77                        nw[2],nw[3],bc[0],bc[1],bc[2],bc[3]);
  78         }
  79         return 0;
  80 }