1 /* $OpenBSD: gethostnamadr.c,v 1.3 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 [-46e] <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, aflag, family = AF_INET;
44 struct hostent *h;
45 char *host;
46 char addr[16];
47 int addrlen;
48
49 aflag = 0;
50 while((ch = getopt(argc, argv, "46R:ae")) != -1) {
51 switch(ch) {
52 case '4':
53 family = AF_INET;
54 break;
55 case '6':
56 family = AF_INET6;
57 break;
58 case 'R':
59 parseresopt(optarg);
60 break;
61 case 'a':
62 aflag = 1;
63 break;
64 case 'e':
65 long_err += 1;
66 break;
67 default:
68 usage();
69 /* NOTREACHED */
70 }
71 }
72 argc -= optind;
73 argv += optind;
74
75 for(i = 0; i < argc; i++) {
76
77 if (i)
78 printf("\n");
79 printf("===> \"%s\"\n", argv[i]);
80 host = gethostarg(argv[i]);
81
82 if (aflag && addr_from_str(addr, &family, &addrlen, host) == -1)
83 errx(1, "bad address");
84
85 errno = 0;
86 h_errno = 0;
87 gai_errno = 0;
88 rrset_errno = 0;
89
90 if (aflag == 0)
91 h = gethostbyname2(host, family);
92 else
93 h = gethostbyaddr(addr, addrlen, family);
94 if (h)
95 print_hostent(h);
96 print_errors();
97 }
98
99 return (0);
100 }
101
102 int
addr_from_str(char * addr,int * family,int * len,const char * src)103 addr_from_str(char *addr, int *family, int *len, const char *src)
104 {
105 if (inet_pton(AF_INET6, src, addr) == 1) {
106 *family = AF_INET6;
107 *len = 16;
108 return (0);
109 }
110 if (inet_pton(AF_INET, src, addr) == 1) {
111 *family = AF_INET;
112 *len = 4;
113 return (0);
114 }
115 return (-1);
116 }
117