1/*
2 Copyright (c) 2000, 2010, Oracle and/or its affiliates
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; version 2 of the License.
7
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
12
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
16
17/* Resolves IP's to hostname and hostnames to IP's */
18
19#define RESOLVE_VERSION "2.3"
20
21#include <my_global.h>
22#include <m_ctype.h>
23#include <my_sys.h>
24#include <m_string.h>
25#ifndef WIN32
26# include <sys/types.h>
27# include <sys/socket.h>
28# include <netinet/in.h>
29# include <arpa/inet.h>
30# include <netdb.h>
31#endif
32#include <my_net.h>
33#include <my_getopt.h>
34
35#if !defined(_AIX) && !defined(h_errno)
36extern int h_errno;
37#endif
38
39static my_bool silent;
40
41static struct my_option my_long_options[] =
42{
43 {"help", '?', "Displays this help and exits.",
44 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
45 {"info", 'I', "Synonym for --help.",
46 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
47 {"silent", 's', "Be more silent.", &silent, &silent,
48 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
49 {"version", 'V', "Displays version information and exits.",
50 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
51 { 0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}
52};
53
54
55static void print_version(void)
56{
57 printf("%s Ver %s, for %s (%s)\n",my_progname,RESOLVE_VERSION,
58 SYSTEM_TYPE,MACHINE_TYPE);
59}
60
61
62static void usage(void)
63{
64 print_version();
65 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");
66 puts("Get hostname based on IP-address or IP-address based on hostname.\n");
67 printf("Usage: %s [OPTIONS] hostname or IP-address\n",my_progname);
68 my_print_help(my_long_options);
69 my_print_variables(my_long_options);
70}
71
72
73static my_bool
74get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
75 char *argument __attribute__((unused)))
76{
77 switch (optid) {
78 case 'V': print_version(); exit(0);
79 case 'I':
80 case '?':
81 usage();
82 exit(0);
83 }
84 return 0;
85}
86
87/*static char * load_default_groups[]= { "resolveip","client",0 }; */
88
89static int get_options(int *argc,char ***argv)
90{
91 int ho_error;
92
93 if ((ho_error=handle_options(argc, argv, my_long_options, get_one_option)))
94 exit(ho_error);
95
96 if (*argc == 0)
97 {
98 usage();
99 return 1;
100 }
101 return 0;
102} /* get_options */
103
104
105
106int main(int argc, char **argv)
107{
108 struct hostent *hpaddr;
109 in_addr_t taddr;
110 char *ip,**q;
111 int error=0;
112
113 MY_INIT(argv[0]);
114
115 if (get_options(&argc,&argv))
116 exit(1);
117
118 while (argc--)
119 {
120#ifndef WIN32
121 struct in_addr addr;
122#endif
123 ip = *argv++;
124
125 /* Not compatible with IPv6! Probably should use getnameinfo(). */
126#ifdef WIN32
127 taddr = inet_addr(ip);
128 if(taddr != INADDR_NONE)
129 {
130#else
131 if (inet_aton(ip, &addr) != 0)
132 {
133 taddr= addr.s_addr;
134#endif
135 if (taddr == htonl(INADDR_BROADCAST))
136 {
137 puts("Broadcast");
138 continue;
139 }
140 if (taddr == htonl(INADDR_ANY))
141 {
142 if (!taddr)
143 puts("Null-IP-Addr");
144 else
145 puts("Old-Bcast");
146 continue;
147 }
148
149 hpaddr = gethostbyaddr((char*) &(taddr), sizeof(struct in_addr),AF_INET);
150 if (hpaddr)
151 {
152 if (silent)
153 puts(hpaddr->h_name);
154 else
155 {
156 printf ("Host name of %s is %s", ip,hpaddr->h_name);
157 for (q = hpaddr->h_aliases; *q != 0; q++)
158 (void) printf(", %s", *q);
159 puts("");
160 }
161 }
162 else
163 {
164 error=2;
165 fprintf(stderr,"%s: Unable to find hostname for '%s'\n",my_progname,
166 ip);
167 }
168 }
169 else
170 {
171 hpaddr = gethostbyname(ip);
172 if (!hpaddr)
173 {
174 const char *err;
175 fprintf(stderr,"%s: Unable to find hostid for '%s'",my_progname,ip);
176 switch (h_errno) {
177 case HOST_NOT_FOUND: err="host not found"; break;
178 case TRY_AGAIN: err="try again"; break;
179 case NO_RECOVERY: err="no recovery"; break;
180 case NO_DATA: err="no_data"; break;
181 default: err=0;
182 }
183 if (err)
184 fprintf(stderr,": %s\n",err);
185 else
186 fprintf(stderr,"\n");
187 error=2;
188 }
189 else if (silent)
190 {
191 struct in_addr in;
192 memcpy((char*) &in.s_addr, (char*) *hpaddr->h_addr_list,
193 sizeof (in.s_addr));
194 puts(inet_ntoa(in));
195 }
196 else
197 {
198 char **p;
199 for (p = hpaddr->h_addr_list; *p != 0; p++)
200 {
201 struct in_addr in;
202 memcpy(&in.s_addr, *p, sizeof (in.s_addr));
203 printf ("IP address of %s is %s\n",ip,inet_ntoa(in));
204 }
205 }
206 }
207 }
208 exit(error);
209}
210