xref: /freebsd/usr.bin/uname/uname.c (revision b3e7694832e81d7a904a10f525f8797b753bf0d3)
1 /*-
2  * SPDX-License-Identifier: BSD-4-Clause
3  *
4  * Copyright (c) 2002 Juli Mallett.
5  * Copyright (c) 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. All advertising materials mentioning features or use of this software
17  *    must display the following acknowledgement:
18  *	This product includes software developed by the University of
19  *	California, Berkeley and its contributors.
20  * 4. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  */
36 
37 #include <sys/cdefs.h>
38 
39 __FBSDID("$FreeBSD$");
40 
41 #ifndef lint
42 static const char copyright[] =
43 "@(#) Copyright (c) 1993\n\
44 	The Regents of the University of California.  All rights reserved.\n";
45 #endif
46 
47 #ifndef lint
48 static const char sccsid[] = "@(#)uname.c	8.2 (Berkeley) 5/4/95";
49 #endif
50 
51 #include <sys/param.h>
52 #include <sys/sysctl.h>
53 
54 #include <err.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <unistd.h>
58 
59 #include <osreldate.h>
60 
61 #define	MFLAG	0x01
62 #define	NFLAG	0x02
63 #define	PFLAG	0x04
64 #define	RFLAG	0x08
65 #define	SFLAG	0x10
66 #define	VFLAG	0x20
67 #define	IFLAG	0x40
68 #define	UFLAG	0x80
69 #define	KFLAG	0x100
70 #define	BFLAG	0x200
71 
72 typedef void (*get_t)(void);
73 static get_t get_buildid, get_ident, get_platform, get_hostname, get_arch,
74     get_release, get_sysname, get_kernvers, get_uservers, get_version;
75 
76 static void native_ident(void);
77 static void native_platform(void);
78 static void native_hostname(void);
79 static void native_arch(void);
80 static void native_release(void);
81 static void native_sysname(void);
82 static void native_version(void);
83 static void native_kernvers(void);
84 static void native_uservers(void);
85 static void native_buildid(void);
86 static void print_uname(u_int);
87 static void setup_get(void);
88 static void usage(void) __dead2;
89 
90 static char *buildid, *ident, *platform, *hostname, *arch, *release, *sysname,
91     *version, *kernvers, *uservers;
92 static int space;
93 
94 int
95 main(int argc, char *argv[])
96 {
97 	u_int flags;
98 	int ch;
99 
100 	setup_get();
101 	flags = 0;
102 
103 	while ((ch = getopt(argc, argv, "abiKmnoprsUv")) != -1)
104 		switch(ch) {
105 		case 'a':
106 			flags |= (MFLAG | NFLAG | RFLAG | SFLAG | VFLAG);
107 			break;
108 		case 'b':
109 			flags |= BFLAG;
110 			break;
111 		case 'i':
112 			flags |= IFLAG;
113 			break;
114 		case 'K':
115 			flags |= KFLAG;
116 			break;
117 		case 'm':
118 			flags |= MFLAG;
119 			break;
120 		case 'n':
121 			flags |= NFLAG;
122 			break;
123 		case 'p':
124 			flags |= PFLAG;
125 			break;
126 		case 'r':
127 			flags |= RFLAG;
128 			break;
129 		case 's':
130 		case 'o':
131 			flags |= SFLAG;
132 			break;
133 		case 'U':
134 			flags |= UFLAG;
135 			break;
136 		case 'v':
137 			flags |= VFLAG;
138 			break;
139 		case '?':
140 		default:
141 			usage();
142 		}
143 
144 	argc -= optind;
145 	argv += optind;
146 
147 	if (argc)
148 		usage();
149 
150 	if (!flags)
151 		flags |= SFLAG;
152 
153 	print_uname(flags);
154 	exit(0);
155 }
156 
157 #define	CHECK_ENV(opt,var)				\
158 do {							\
159 	if ((var = getenv("UNAME_" opt)) == NULL) {	\
160 		get_##var = native_##var;		\
161 	} else {					\
162 		get_##var = (get_t)NULL;		\
163 	}						\
164 } while (0)
165 
166 static void
167 setup_get(void)
168 {
169 	CHECK_ENV("s", sysname);
170 	CHECK_ENV("n", hostname);
171 	CHECK_ENV("r", release);
172 	CHECK_ENV("v", version);
173 	CHECK_ENV("m", platform);
174 	CHECK_ENV("p", arch);
175 	CHECK_ENV("i", ident);
176 	CHECK_ENV("K", kernvers);
177 	CHECK_ENV("U", uservers);
178 	CHECK_ENV("b", buildid);
179 }
180 
181 #define	PRINT_FLAG(flags,flag,var)		\
182 	if ((flags & flag) == flag) {		\
183 		if (space)			\
184 			printf(" ");		\
185 		else				\
186 			space++;		\
187 		if (get_##var != NULL)		\
188 			(*get_##var)();		\
189 		printf("%s", var);		\
190 	}
191 
192 static void
193 print_uname(u_int flags)
194 {
195 	PRINT_FLAG(flags, SFLAG, sysname);
196 	PRINT_FLAG(flags, NFLAG, hostname);
197 	PRINT_FLAG(flags, RFLAG, release);
198 	PRINT_FLAG(flags, VFLAG, version);
199 	PRINT_FLAG(flags, MFLAG, platform);
200 	PRINT_FLAG(flags, PFLAG, arch);
201 	PRINT_FLAG(flags, IFLAG, ident);
202 	PRINT_FLAG(flags, KFLAG, kernvers);
203 	PRINT_FLAG(flags, UFLAG, uservers);
204 	PRINT_FLAG(flags, BFLAG, buildid);
205 	printf("\n");
206 }
207 
208 #define	NATIVE_SYSCTL2_GET(var,mib0,mib1)	\
209 static void					\
210 native_##var(void)				\
211 {						\
212 	int mib[] = { (mib0), (mib1) };		\
213 	size_t len;				\
214 	static char buf[1024];			\
215 	char **varp = &(var);			\
216 						\
217 	len = sizeof buf;			\
218 	if (sysctl(mib, sizeof mib / sizeof mib[0],	\
219 	   &buf, &len, NULL, 0) == -1)		\
220 		err(1, "sysctl");
221 
222 #define	NATIVE_SYSCTLNAME_GET(var,name)		\
223 static void					\
224 native_##var(void)				\
225 {						\
226 	size_t len;				\
227 	static char buf[1024];			\
228 	char **varp = &(var);			\
229 						\
230 	len = sizeof buf;			\
231 	if (sysctlbyname(name, &buf, &len, NULL,\
232 	    0) == -1)				\
233 		err(1, "sysctlbyname");
234 
235 #define	NATIVE_SET				\
236 	*varp = buf;				\
237 	return;					\
238 }	struct __hack
239 
240 #define	NATIVE_BUFFER	(buf)
241 #define	NATIVE_LENGTH	(len)
242 
243 NATIVE_SYSCTL2_GET(sysname, CTL_KERN, KERN_OSTYPE) {
244 } NATIVE_SET;
245 
246 NATIVE_SYSCTL2_GET(hostname, CTL_KERN, KERN_HOSTNAME) {
247 } NATIVE_SET;
248 
249 NATIVE_SYSCTL2_GET(release, CTL_KERN, KERN_OSRELEASE) {
250 } NATIVE_SET;
251 
252 NATIVE_SYSCTL2_GET(version, CTL_KERN, KERN_VERSION) {
253 	size_t n;
254 	char *p;
255 
256 	p = NATIVE_BUFFER;
257 	n = NATIVE_LENGTH;
258 	for (; n--; ++p)
259 		if (*p == '\n' || *p == '\t') {
260 			if (n > 1)
261 				*p = ' ';
262 			else
263 				*p = '\0';
264 		}
265 } NATIVE_SET;
266 
267 NATIVE_SYSCTL2_GET(platform, CTL_HW, HW_MACHINE) {
268 } NATIVE_SET;
269 
270 NATIVE_SYSCTL2_GET(arch, CTL_HW, HW_MACHINE_ARCH) {
271 } NATIVE_SET;
272 
273 NATIVE_SYSCTLNAME_GET(ident, "kern.ident") {
274 } NATIVE_SET;
275 
276 NATIVE_SYSCTLNAME_GET(buildid, "kern.build_id") {
277 } NATIVE_SET;
278 
279 static void
280 native_uservers(void)
281 {
282 	static char buf[128];
283 
284 	snprintf(buf, sizeof(buf), "%d", __FreeBSD_version);
285 	uservers = buf;
286 }
287 
288 static void
289 native_kernvers(void)
290 {
291 	static char buf[128];
292 
293 	snprintf(buf, sizeof(buf), "%d", getosreldate());
294 	kernvers = buf;
295 }
296 
297 static void
298 usage(void)
299 {
300 	fprintf(stderr, "usage: uname [-abiKmnoprsUv]\n");
301 	exit(1);
302 }
303