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/param.h>
38#include <sys/sysctl.h>
39
40#include <err.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <unistd.h>
44
45#include <osreldate.h>
46
47#define	MFLAG	0x01
48#define	NFLAG	0x02
49#define	PFLAG	0x04
50#define	RFLAG	0x08
51#define	SFLAG	0x10
52#define	VFLAG	0x20
53#define	IFLAG	0x40
54#define	UFLAG	0x80
55#define	KFLAG	0x100
56#define	BFLAG	0x200
57
58typedef void (*get_t)(void);
59static get_t get_buildid, get_ident, get_platform, get_hostname, get_arch,
60    get_release, get_sysname, get_kernvers, get_uservers, get_version;
61
62static void native_ident(void);
63static void native_platform(void);
64static void native_hostname(void);
65static void native_arch(void);
66static void native_release(void);
67static void native_sysname(void);
68static void native_version(void);
69static void native_kernvers(void);
70static void native_uservers(void);
71static void native_buildid(void);
72static void print_uname(u_int);
73static void setup_get(void);
74static void usage(void) __dead2;
75
76static char *buildid, *ident, *platform, *hostname, *arch, *release, *sysname,
77    *version, *kernvers, *uservers;
78static int space;
79
80int
81main(int argc, char *argv[])
82{
83	u_int flags;
84	int ch;
85
86	setup_get();
87	flags = 0;
88
89	while ((ch = getopt(argc, argv, "abiKmnoprsUv")) != -1)
90		switch(ch) {
91		case 'a':
92			flags |= (MFLAG | NFLAG | RFLAG | SFLAG | VFLAG);
93			break;
94		case 'b':
95			flags |= BFLAG;
96			break;
97		case 'i':
98			flags |= IFLAG;
99			break;
100		case 'K':
101			flags |= KFLAG;
102			break;
103		case 'm':
104			flags |= MFLAG;
105			break;
106		case 'n':
107			flags |= NFLAG;
108			break;
109		case 'p':
110			flags |= PFLAG;
111			break;
112		case 'r':
113			flags |= RFLAG;
114			break;
115		case 's':
116		case 'o':
117			flags |= SFLAG;
118			break;
119		case 'U':
120			flags |= UFLAG;
121			break;
122		case 'v':
123			flags |= VFLAG;
124			break;
125		case '?':
126		default:
127			usage();
128		}
129
130	argc -= optind;
131	argv += optind;
132
133	if (argc)
134		usage();
135
136	if (!flags)
137		flags |= SFLAG;
138
139	print_uname(flags);
140	exit(0);
141}
142
143#define	CHECK_ENV(opt,var)				\
144do {							\
145	if ((var = getenv("UNAME_" opt)) == NULL) {	\
146		get_##var = native_##var;		\
147	} else {					\
148		get_##var = (get_t)NULL;		\
149	}						\
150} while (0)
151
152static void
153setup_get(void)
154{
155	CHECK_ENV("s", sysname);
156	CHECK_ENV("n", hostname);
157	CHECK_ENV("r", release);
158	CHECK_ENV("v", version);
159	CHECK_ENV("m", platform);
160	CHECK_ENV("p", arch);
161	CHECK_ENV("i", ident);
162	CHECK_ENV("K", kernvers);
163	CHECK_ENV("U", uservers);
164	CHECK_ENV("b", buildid);
165}
166
167#define	PRINT_FLAG(flags,flag,var)		\
168	if ((flags & flag) == flag) {		\
169		if (space)			\
170			printf(" ");		\
171		else				\
172			space++;		\
173		if (get_##var != NULL)		\
174			(*get_##var)();		\
175		printf("%s", var);		\
176	}
177
178static void
179print_uname(u_int flags)
180{
181	PRINT_FLAG(flags, SFLAG, sysname);
182	PRINT_FLAG(flags, NFLAG, hostname);
183	PRINT_FLAG(flags, RFLAG, release);
184	PRINT_FLAG(flags, VFLAG, version);
185	PRINT_FLAG(flags, MFLAG, platform);
186	PRINT_FLAG(flags, PFLAG, arch);
187	PRINT_FLAG(flags, IFLAG, ident);
188	PRINT_FLAG(flags, KFLAG, kernvers);
189	PRINT_FLAG(flags, UFLAG, uservers);
190	PRINT_FLAG(flags, BFLAG, buildid);
191	printf("\n");
192}
193
194#define	NATIVE_SYSCTL2_GET(var,mib0,mib1)	\
195static void					\
196native_##var(void)				\
197{						\
198	int mib[] = { (mib0), (mib1) };		\
199	size_t len;				\
200	static char buf[1024];			\
201	char **varp = &(var);			\
202						\
203	len = sizeof buf;			\
204	if (sysctl(mib, sizeof mib / sizeof mib[0],	\
205	   &buf, &len, NULL, 0) == -1)		\
206		err(1, "sysctl");
207
208#define	NATIVE_SYSCTLNAME_GET(var,name)		\
209static void					\
210native_##var(void)				\
211{						\
212	size_t len;				\
213	static char buf[1024];			\
214	char **varp = &(var);			\
215						\
216	len = sizeof buf;			\
217	if (sysctlbyname(name, &buf, &len, NULL,\
218	    0) == -1)				\
219		err(1, "sysctlbyname");
220
221#define	NATIVE_SET				\
222	*varp = buf;				\
223	return;					\
224}	struct __hack
225
226#define	NATIVE_BUFFER	(buf)
227#define	NATIVE_LENGTH	(len)
228
229NATIVE_SYSCTL2_GET(sysname, CTL_KERN, KERN_OSTYPE) {
230} NATIVE_SET;
231
232NATIVE_SYSCTL2_GET(hostname, CTL_KERN, KERN_HOSTNAME) {
233} NATIVE_SET;
234
235NATIVE_SYSCTL2_GET(release, CTL_KERN, KERN_OSRELEASE) {
236} NATIVE_SET;
237
238NATIVE_SYSCTL2_GET(version, CTL_KERN, KERN_VERSION) {
239	size_t n;
240	char *p;
241
242	p = NATIVE_BUFFER;
243	n = NATIVE_LENGTH;
244	for (; n--; ++p)
245		if (*p == '\n' || *p == '\t') {
246			if (n > 1)
247				*p = ' ';
248			else
249				*p = '\0';
250		}
251} NATIVE_SET;
252
253NATIVE_SYSCTL2_GET(platform, CTL_HW, HW_MACHINE) {
254} NATIVE_SET;
255
256NATIVE_SYSCTL2_GET(arch, CTL_HW, HW_MACHINE_ARCH) {
257} NATIVE_SET;
258
259NATIVE_SYSCTLNAME_GET(ident, "kern.ident") {
260} NATIVE_SET;
261
262NATIVE_SYSCTLNAME_GET(buildid, "kern.build_id") {
263} NATIVE_SET;
264
265static void
266native_uservers(void)
267{
268	static char buf[128];
269
270	snprintf(buf, sizeof(buf), "%d", __FreeBSD_version);
271	uservers = buf;
272}
273
274static void
275native_kernvers(void)
276{
277	static char buf[128];
278
279	snprintf(buf, sizeof(buf), "%d", getosreldate());
280	kernvers = buf;
281}
282
283static void
284usage(void)
285{
286	fprintf(stderr, "usage: uname [-abiKmnoprsUv]\n");
287	exit(1);
288}
289