package/network/iproute2/ipnm2nwbc.c

   1 // --- T2-COPYRIGHT-NOTE-BEGIN ---
   2 // This copyright note is auto-generated by ./scripts/Create-CopyPatch.
   3 //
   4 // T2 SDE: package/.../iproute2/ipnm2nwbc.c
   5 // Copyright (C) 2004 - 2005 The T2 SDE Project
   6 // Copyright (C) 1998 - 2003 ROCK Linux Project
   7 //
   8 // More information can be found in the files COPYING and README.
   9 //
  10 // This program is free software; you can redistribute it and/or modify
  11 // it under the terms of the GNU General Public License as published by
  12 // the Free Software Foundation; version 2 of the License. A copy of the
  13 // GNU General Public License can be found in the file COPYING.
  14 // --- T2-COPYRIGHT-NOTE-END ---
  15
  16 #include <stdio.h>
  17
  18 int getbits(int n) {
  19         int rc=0;
  20         while (n) {
  21                 if (n&1) rc++;
  22                 n = n >> 1;
  23         }
  24         return rc;
  25 }
  26
  27 int setbits(int n) {
  28         int rc=0;
  29         while (n--) {
  30                 rc = (rc>>1)|(1<<7);
  31         }
  32         return rc;
  33 }
  34
  35 int main(int argc, char ** argv) {
  36         int ip[4],nm[4],nw[4],bc[4],c;
  37         int verbose=0,nmbits=0,n;
  38
  39         if ( argc > 1 && !strcmp(argv[1],"-v") ) verbose=1;
  40
  41         if ( argc == 3+verbose &&
  42              sscanf(argv[1+verbose],"%d.%d.%d.%d",ip,ip+1,ip+2,ip+3) == 4 &&
  43              sscanf(argv[2+verbose],"%d.%d.%d.%d",nm,nm+1,nm+2,nm+3) == 4 ) {
  44                 nmbits=getbits(nm[0])+getbits(nm[1])+
  45                        getbits(nm[2])+getbits(nm[3]);
  46         } else if ( argc == 2+verbose && sscanf(argv[1+verbose],
  47                     "%d.%d.%d.%d/%d",ip,ip+1,ip+2,ip+3,&nmbits) == 5 ) {
  48                 n=nmbits;
  49                 if (n>0) { nm[0]=setbits(n>8?8:n); n-=8; } else nm[0]=0;
  50                 if (n>0) { nm[1]=setbits(n>8?8:n); n-=8; } else nm[1]=0;
  51                 if (n>0) { nm[2]=setbits(n>8?8:n); n-=8; } else nm[2]=0;
  52                 if (n>0) { nm[3]=setbits(n>8?8:n); n-=8; } else nm[3]=0;
  53         } else {
  54                 fprintf(stderr,"\n"
  55                     "IP and Netmask  to  Network and Broadcast  converter.\n"
  56                     "(C) under GPL, 1999 Clifford Wolf\n\n"
  57                     "Usage: %s [-v] <IP> <Netmask>\n"
  58                     "       %s [-v] <IP>/<Mask>\n\n"
  59                     "Examples: %s -v 195.170.70.72/25\n"
  60                     "          %s 195.170.70.72 255.255.255.128\n\n",
  61                     argv[0],argv[0],argv[0],argv[0]);
  62                 return 1;
  63         }
  64
  65         for (c=0; c<4; c++) {
  66                 nw[c]=ip[c]&nm[c];
  67                 bc[c]=nw[c]|(255&~nm[c]);
  68         }
  69
  70         if ( verbose ) {
  71                 printf("Network:   %d.%d.%d.%d / %d\n",
  72                         nw[0],nw[1],nw[2],nw[3],nmbits);
  73                 printf("Netmask:   %d.%d.%d.%d\n",
  74                         nm[0],nm[1],nm[2],nm[3]);
  75                 printf("Broadcast: %d.%d.%d.%d\n",
  76                         bc[0],bc[1],bc[2],bc[3]);
  77         } else {
  78                 printf("%d.%d.%d.%d %d.%d.%d.%d\n",nw[0],nw[1],
  79                        nw[2],nw[3],bc[0],bc[1],bc[2],bc[3]);
  80         }
  81         return 0;
  82 }