/* Copyright (c) 2000, 2023, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

/* Resolves IP's to hostname and hostnames to IP's */

#define RESOLVE_VERSION "2.3"

#include <my_global.h>
#include <m_ctype.h>
#include <my_sys.h>
#include <m_string.h>
#include <my_getopt.h>

#ifndef WIN32
#  include <sys/types.h>
#  include <netdb.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#  include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#  include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#  include <arpa/inet.h>
#endif

#if !defined(h_errno)
extern int h_errno;
#endif

typedef uint32 in_addr_t;

static my_bool silent;

static struct my_option my_long_options[] =
{
  {"help", '?', "Displays this help and exits.",
   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"info", 'I', "Synonym for --help.",
   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"silent", 's', "Be more silent.", &silent, &silent,
   0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"version", 'V', "Displays version information and exits.",
   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
  { 0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}
};


static void print_version(void)
{
  printf("%s Ver %s, for %s (%s)\n",my_progname,RESOLVE_VERSION,
	 SYSTEM_TYPE,MACHINE_TYPE);
}


static void usage(void)
{
  print_version();
  puts("This software comes with ABSOLUTELY NO WARRANTY. This is free software,\nand you are welcome to modify and redistribute it under the GPL license\n");
  puts("Get hostname based on IP-address or IP-address based on hostname.\n");
  printf("Usage: %s [OPTIONS] hostname or IP-address\n",my_progname);
  my_print_help(my_long_options);
  my_print_variables(my_long_options);
}


static my_bool
get_one_option(int optid, const struct my_option *opt MY_ATTRIBUTE((unused)),
	       char *argument MY_ATTRIBUTE((unused)))
{
  switch (optid) {
  case 'V': print_version(); exit(0);
  case 'I':
  case '?':
    usage();
    exit(0);
  }
  return 0;
}

/*static char * load_default_groups[]= { "resolveip","client",0 }; */

static int get_options(int *argc,char ***argv)
{
  int ho_error;

  if ((ho_error=handle_options(argc, argv, my_long_options, get_one_option)))
    exit(ho_error);

  if (*argc == 0)
  {
    usage();
    return 1;
  }
  return 0;
} /* get_options */



int main(int argc, char **argv)
{
  struct hostent *hpaddr;
  in_addr_t taddr;
  char *ip,**q;
  int error=0;

  fprintf(stderr, "Warning: resolveip is deprecated and will be removed in a future "
	           "version.\n");

  MY_INIT(argv[0]);

  if (get_options(&argc,&argv))
    exit(1);

  while (argc--)
  {
#ifndef WIN32
    struct in_addr addr;
#endif
    ip = *argv++;    

    /* Not compatible with IPv6!  Probably should use getnameinfo(). */
#ifdef WIN32
    taddr = inet_addr(ip);
    if(taddr != INADDR_NONE)
    {
#else
    if (inet_aton(ip, &addr) != 0)
    {
      taddr= addr.s_addr;
#endif
      if (taddr == htonl(INADDR_BROADCAST))
      {	
	puts("Broadcast");
	continue;
      }
      if (taddr == htonl(INADDR_ANY)) 
      {
	if (!taddr) 
	  puts("Null-IP-Addr");
	else
	  puts("Old-Bcast");
	continue;
      }

      hpaddr = gethostbyaddr((char*) &(taddr), sizeof(struct in_addr),AF_INET);
      if (hpaddr) 
      {
	if (silent)
	  puts(hpaddr->h_name);
	else
	{
	  printf ("Host name of %s is %s", ip,hpaddr->h_name);
	  for (q = hpaddr->h_aliases; *q != 0; q++)
	    (void) printf(", %s", *q);
	  puts("");
	}
      }
      else
      {
	error=2;
	fprintf(stderr,"%s: Unable to find hostname for '%s'\n",my_progname,
		ip);
      }
    }
    else
    {
      hpaddr = gethostbyname(ip);
      if (!hpaddr)
      {
	const char *err;
	fprintf(stderr,"%s: Unable to find hostid for '%s'",my_progname,ip);
	switch (h_errno) {
	case HOST_NOT_FOUND: err="host not found"; break;
	case TRY_AGAIN: err="try again"; break;
	case NO_RECOVERY: err="no recovery"; break;
	case NO_DATA: err="no_data"; break;
	default: err=0;
	}
	if (err)
	  fprintf(stderr,": %s\n",err);
	else
	  fprintf(stderr,"\n");
	error=2;
      }
      else if (silent)
      {
	struct in_addr in;
	memcpy((char*) &in.s_addr, (char*) *hpaddr->h_addr_list,
	       sizeof (in.s_addr));
	puts(inet_ntoa(in));
      }
      else
      {
	char **p;
	for (p = hpaddr->h_addr_list; *p != 0; p++)
	{
	  struct in_addr in;
	  memcpy(&in.s_addr, *p, sizeof (in.s_addr));
	  printf ("IP address of %s is %s\n",ip,inet_ntoa(in));
	}
      }
    }
  }
  exit(error);
}
