1/*
2 * Copyright 2000 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission.  M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose.  It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#include <sys/types.h>
34
35#include <err.h>
36#include <errno.h>
37#include <stdbool.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <sysexits.h>
41#include <unistd.h>
42
43#include "getconf.h"
44
45static void	do_allsys(void);
46static void	do_allpath(const char *path);
47static void	do_confstr(const char *name, int key);
48static void	do_sysconf(const char *name, int key);
49static void	do_pathconf(const char *name, int key, const char *path);
50
51static void
52usage(void)
53{
54	fprintf(stderr,
55"usage: getconf -a [pathname]\n"
56"       getconf [-v prog_env] system_var\n"
57"       getconf [-v prog_env] path_var pathname\n");
58	exit(EX_USAGE);
59}
60
61int
62main(int argc, char **argv)
63{
64	bool aflag;
65	int c, key, valid;
66	const char *name, *vflag, *alt_path;
67	intmax_t limitval;
68	uintmax_t ulimitval;
69
70	aflag = false;
71	vflag = NULL;
72	while ((c = getopt(argc, argv, "av:")) != -1) {
73		switch (c) {
74		case 'a':
75			aflag = true;
76			break;
77		case 'v':
78			vflag = optarg;
79			break;
80
81		default:
82			usage();
83		}
84	}
85
86	if (aflag) {
87		if (vflag != NULL)
88			usage();
89		if (argv[optind] == NULL)
90			do_allsys();
91		else
92			do_allpath(argv[optind]);
93		return (0);
94	}
95
96	if ((name = argv[optind]) == NULL)
97		usage();
98
99	if (vflag != NULL) {
100		if ((valid = find_progenv(vflag, &alt_path)) == 0)
101			errx(EX_USAGE, "invalid programming environment %s",
102			     vflag);
103		if (valid > 0 && alt_path != NULL) {
104			if (argv[optind + 1] == NULL)
105				execl(alt_path, "getconf", argv[optind],
106				      (char *)NULL);
107			else
108				execl(alt_path, "getconf", argv[optind],
109				      argv[optind + 1], (char *)NULL);
110
111			err(EX_OSERR, "execl: %s", alt_path);
112		}
113		if (valid < 0)
114			errx(EX_UNAVAILABLE, "environment %s is not available",
115			     vflag);
116	}
117
118	if (argv[optind + 1] == NULL) { /* confstr or sysconf */
119		if ((valid = find_unsigned_limit(name, &ulimitval)) != 0) {
120			if (valid > 0)
121				printf("%" PRIuMAX "\n", ulimitval);
122			else
123				printf("undefined\n");
124			return 0;
125		}
126		if ((valid = find_limit(name, &limitval)) != 0) {
127			if (valid > 0)
128				printf("%" PRIdMAX "\n", limitval);
129			else
130				printf("undefined\n");
131
132			return 0;
133		}
134		if ((valid = find_confstr(name, &key)) != 0) {
135			if (valid > 0)
136				do_confstr(name, key);
137			else
138				printf("undefined\n");
139		} else {
140			valid = find_sysconf(name, &key);
141			if (valid > 0) {
142				do_sysconf(name, key);
143			} else if (valid < 0) {
144				printf("undefined\n");
145			} else
146				errx(EX_USAGE,
147				     "no such configuration parameter `%s'",
148				     name);
149		}
150	} else {
151		valid = find_pathconf(name, &key);
152		if (valid != 0) {
153			if (valid > 0)
154				do_pathconf(name, key, argv[optind + 1]);
155			else
156				printf("undefined\n");
157		} else
158			errx(EX_USAGE,
159			     "no such path configuration parameter `%s'",
160			     name);
161	}
162	return 0;
163}
164
165static void
166do_onestr(const char *name, int key)
167{
168	size_t len;
169
170	errno = 0;
171	len = confstr(key, 0, 0);
172	if (len == 0 && errno != 0) {
173		warn("confstr: %s", name);
174		return;
175	}
176	printf("%s: ", name);
177	if (len == 0)
178		printf("undefined\n");
179	else {
180		char buf[len + 1];
181
182		confstr(key, buf, len);
183		printf("%s\n", buf);
184	}
185}
186
187static void
188do_onesys(const char *name, int key)
189{
190	long value;
191
192	errno = 0;
193	value = sysconf(key);
194	if (value == -1 && errno != 0) {
195		warn("sysconf: %s", name);
196		return;
197	}
198	printf("%s: ", name);
199	if (value == -1)
200		printf("undefined\n");
201	else
202		printf("%ld\n", value);
203}
204
205static void
206do_allsys(void)
207{
208
209	foreach_confstr(do_onestr);
210	foreach_sysconf(do_onesys);
211}
212
213static void
214do_onepath(const char *name, int key, const char *path)
215{
216	long value;
217
218	errno = 0;
219	value = pathconf(path, key);
220	if (value == -1 && errno != EINVAL && errno != 0)
221		warn("pathconf: %s", name);
222	printf("%s: ", name);
223	if (value == -1)
224		printf("undefined\n");
225	else
226		printf("%ld\n", value);
227}
228
229static void
230do_allpath(const char *path)
231{
232
233	foreach_pathconf(do_onepath, path);
234}
235
236static void
237do_confstr(const char *name, int key)
238{
239	size_t len;
240	int savederr;
241
242	savederr = errno;
243	errno = 0;
244	len = confstr(key, 0, 0);
245	if (len == 0) {
246		if (errno)
247			err(EX_OSERR, "confstr: %s", name);
248		else
249			printf("undefined\n");
250	} else {
251		char buf[len + 1];
252
253		confstr(key, buf, len);
254		printf("%s\n", buf);
255	}
256	errno = savederr;
257}
258
259static void
260do_sysconf(const char *name, int key)
261{
262	long value;
263
264	errno = 0;
265	value = sysconf(key);
266	if (value == -1 && errno != 0)
267		err(EX_OSERR, "sysconf: %s", name);
268	else if (value == -1)
269		printf("undefined\n");
270	else
271		printf("%ld\n", value);
272}
273
274static void
275do_pathconf(const char *name, int key, const char *path)
276{
277	long value;
278
279	errno = 0;
280	value = pathconf(path, key);
281	if (value == -1 && errno != 0)
282		err(EX_OSERR, "pathconf: %s", name);
283	else if (value == -1)
284		printf("undefined\n");
285	else
286		printf("%ld\n", value);
287}
288
289