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/*
Copyright (c) 2000, 2010, 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 as published by
the Free Software Foundation; version 2 of the License.
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 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 02110-1335 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>
#ifndef WIN32
# include <sys/types.h>
# include <sys/socket.h>
# include <netinet/in.h>
# include <arpa/inet.h>
# include <netdb.h>
#endif
#include <my_net.h>
#include <my_getopt.h>
#if !defined(_AIX) && !defined(h_errno)
extern int h_errno;
#endif
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 __attribute__((unused)),
char *argument __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;
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);
}
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