1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * University Copyright- Copyright (c) 1982, 1986, 1988
24 * The Regents of the University of California
25 * All Rights Reserved
26 *
27 * University Acknowledgment- Portions of this document are derived from
28 * software developed by the University of California, Berkeley, and its
29 * contributors.
30 */
31
32 /*
33 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
34 * Use is subject to license terms.
35 *
36 * Copyright 2016 RackTop Systems.
37 */
38
39 /* Portions Copyright 2007 Jeremy Teo */
40 /* Portions Copyright 2006 Stephen P. Potter */
41
42 #include <unistd.h>
43 #include <stdio.h>
44 #include <string.h>
45 #include <locale.h>
46 #include <libgen.h>
47 #include <stdlib.h>
48 #include <errno.h>
49 #include <netdb.h>
50 #include <getopt.h>
51
52 #ifndef TEXT_DOMAIN /* should be defined by cc -D */
53 #define TEXT_DOMAIN "SYS_TEST" /* use this only if it wasn't */
54 #endif
55
56 static char *progname;
57
58 static void
59 usage(void)
60 {
61 (void) fprintf(stderr, gettext("usage: %s [-fls|system_name]\n"),
62 basename(progname));
63 exit(1);
64 }
65
66 int
67 main(int argc, char *argv[])
68 {
69 char *nodename = NULL;
70 char c_hostname[MAXHOSTNAMELEN];
71 int optlet, optindex = 0;
72 char *optstring = "fls";
73 int fflag = 0, lflag = 0, sflag = 0;
74 struct option long_options[] = {
75 {"fqdn", no_argument, 0, 'f' },
76 {"long", no_argument, 0, 'l' },
77 {"short", no_argument, 0, 's' },
78 {NULL, 0, 0, 0 }
79 };
80
81 (void) setlocale(LC_ALL, "");
82 (void) textdomain(TEXT_DOMAIN);
83
84 progname = argv[0];
85
86 opterr = 0;
87 while ((optlet = getopt_long(argc, argv, optstring, long_options,
88 &optindex)) != -1) {
89 switch (optlet) {
90 case 'f':
91 fflag++;
92 break;
93 case 'l':
94 lflag++;
95 break;
96 case 's':
97 sflag++;
98 break;
99 case '?':
100 usage();
101 }
102 }
103
104 /* No flag combinations allowed */
105 if (fflag && (lflag || sflag))
106 usage();
107 if (lflag && (fflag || sflag))
108 usage();
109 if (sflag && (lflag || fflag))
110 usage();
111
112 /*
113 * if called with no options, just print out the hostname/nodename
114 */
115 if (argc <= optind) {
116 if (gethostname(c_hostname, sizeof (c_hostname)) < 0) {
117 (void) fprintf(stderr,
118 gettext("%s: unable to obtain hostname\n"),
119 basename(progname));
120 exit(1);
121 }
122 if (fflag || lflag) {
123 struct addrinfo hints, *info;
124 memset(&hints, 0, sizeof (struct addrinfo));
125 hints.ai_socktype = SOCK_DGRAM;
126 hints.ai_flags = AI_CANONNAME;
127 if (getaddrinfo(c_hostname, NULL, &hints, &info) != 0) {
128 (void) fprintf(stderr,
129 gettext("%s: unable to obtain fqdn\n"),
130 basename(progname));
131 exit(1);
132 }
133 (void) fprintf(stdout, "%s\n", info->ai_canonname);
134 } else {
135 if (sflag) {
136 char *p = strchr(c_hostname, '.');
137 if (p != NULL)
138 *p = '\0';
139 }
140 (void) fprintf(stdout, "%s\n", c_hostname);
141 }
142 } else {
143 /*
144 * if called with an argument,
145 * we have to try to set the new hostname/nodename
146 */
147 if (argc > optind + 1)
148 usage(); /* too many arguments */
149 if (fflag || lflag)
150 usage(); /* can't set fqdn this way */
151 if (sflag)
152 usage(); /* can't set short name */
153 nodename = argv[optind];
154 if (sethostname(nodename, strlen(nodename)) < 0) {
155 int err = errno;
156 (void) fprintf(stderr,
157 gettext("%s: error in setting name: %s\n"),
158 basename(progname), strerror(err));
159 exit(1);
160 }
161 }
162 return (0);
163 }