com32/samples/resolv.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2004 H. Peter Anvin - All Rights Reserved
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
   8  *   Boston MA 02111-1307, USA; either version 2 of the License, or
   9  *   (at your option) any later version; incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12
  13 /*
  14  * resolv.c
  15  *
  16  * Resolve an IP address
  17  */
  18
  19 #include <string.h>
  20 #include <stdio.h>
  21 #include <console.h>
  22 #include <stdlib.h>
  23 #include <com32.h>
  24
  25 uint32_t resolv(const char *name)
  26 {
  27   com32sys_t reg;
  28
  29   strcpy((char *)__com32.cs_bounce, name);
  30
  31   memset(&reg, 0, sizeof reg);
  32   reg.eax.w[0] = 0x0010;
  33   reg.ebx.w[0] = OFFS(__com32.cs_bounce);
  34   reg.es       = SEG(__com32.cs_bounce);
  35
  36   __intcall(0x22, &reg, &reg);
  37
  38   if ( reg.eflags.l & EFLAGS_CF )
  39     return 0;
  40   else
  41     return reg.eax.l;
  42 }
  43
  44 int main(int argc, char *argv[])
  45 {
  46   uint32_t ip;
  47
  48   openconsole(&dev_null_r, &dev_stdcon_w);
  49
  50   if ( argc < 2 ) {
  51     fputs("Usage: resolv hostname\n", stderr);
  52     exit(1);
  53   }
  54
  55   ip = resolv(argv[1]);
  56
  57   if ( ip ) {
  58     printf("%s = %u.%u.%u.%u\n", argv[1],
  59            (ip & 0xff), (ip >> 8) & 0xff,
  60            (ip >> 16) & 0xff, (ip >> 24) & 0xff);
  61   } else {
  62     printf("%s not found\n", argv[1]);
  63   }
  64
  65   return 0;
  66 }