1 /* $OpenBSD: getnetnamadr.c,v 1.2 2018/12/15 15:16:12 eric Exp $ */
2 /*
3 * Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17 #include <sys/types.h>
18 #include <sys/socket.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
21
22 #include <err.h>
23 #include <errno.h>
24 #include <getopt.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28
29 #include "common.h"
30
31 static void
usage(void)32 usage(void)
33 {
34 extern const char * __progname;
35
36 fprintf(stderr, "usage: %s [-aen] [host...]\n", __progname);
37 exit(1);
38 }
39
40 int
main(int argc,char * argv[])41 main(int argc, char *argv[])
42 {
43 int i, ch, nflag = 0;
44 struct netent *n;
45 char *host;
46
47 while((ch = getopt(argc, argv, "R:en")) != -1) {
48 switch(ch) {
49 case 'R':
50 parseresopt(optarg);
51 break;
52 case 'e':
53 long_err += 1;
54 break;
55 case 'n':
56 nflag = 1;
57 break;
58 default:
59 usage();
60 /* NOTREACHED */
61 }
62 }
63 argc -= optind;
64 argv += optind;
65
66 for(i = 0; i < argc; i++) {
67
68 if (i)
69 printf("\n");
70 printf("===> \"%s\"\n", argv[i]);
71 host = gethostarg(argv[i]);
72
73 errno = 0;
74 h_errno = 0;
75 gai_errno = 0;
76 rrset_errno = 0;
77
78 if (nflag)
79 n = getnetbyname(host);
80 else
81 n = getnetbyaddr(inet_network(host), AF_INET);
82 if (n)
83 print_netent(n);
84 print_errors();
85 }
86
87 return (0);
88 }
89