1/*-
2 * Copyright (c) 2000  Peter Wemm <peter@freebsd.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD$");
28
29#include <sys/types.h>
30#include <sys/sysctl.h>
31#include <err.h>
32#include <kenv.h>
33#include <stdio.h>
34#include <stdlib.h>
35#include <string.h>
36#include <unistd.h>
37
38static void	usage(void);
39static int	kdumpenv(void);
40static int	kgetenv(const char *);
41static int	ksetenv(const char *, char *);
42static int	kunsetenv(const char *);
43
44static int hflag = 0;
45static int Nflag = 0;
46static int qflag = 0;
47static int uflag = 0;
48static int vflag = 0;
49
50static void
51usage(void)
52{
53	(void)fprintf(stderr, "%s\n%s\n%s\n",
54	    "usage: kenv [-hNq]",
55	    "       kenv [-qv] variable[=value]",
56	    "       kenv [-q] -u variable");
57	exit(1);
58}
59
60int
61main(int argc, char **argv)
62{
63	char *env, *eq, *val;
64	int ch, error;
65
66	error = 0;
67	val = NULL;
68	env = NULL;
69	while ((ch = getopt(argc, argv, "hNquv")) != -1) {
70		switch (ch) {
71		case 'h':
72			hflag++;
73			break;
74		case 'N':
75			Nflag++;
76			break;
77		case 'q':
78			qflag++;
79			break;
80		case 'u':
81			uflag++;
82			break;
83		case 'v':
84			vflag++;
85			break;
86		default:
87			usage();
88		}
89	}
90	argc -= optind;
91	argv += optind;
92	if (argc > 0) {
93		env = argv[0];
94		eq = strchr(env, '=');
95		if (eq != NULL) {
96			*eq++ = '\0';
97			val = eq;
98		}
99		argv++;
100		argc--;
101	}
102	if ((hflag || Nflag) && env != NULL)
103		usage();
104	if (argc > 0 || ((uflag || vflag) && env == NULL))
105		usage();
106	if (env == NULL) {
107		error = kdumpenv();
108		if (error && !qflag)
109			warn("kdumpenv");
110	} else if (val == NULL) {
111		if (uflag) {
112			error = kunsetenv(env);
113			if (error && !qflag)
114				warnx("unable to unset %s", env);
115		} else {
116			error = kgetenv(env);
117			if (error && !qflag)
118				warnx("unable to get %s", env);
119		}
120	} else {
121		error = ksetenv(env, val);
122		if (error && !qflag)
123			warnx("unable to set %s to %s", env, val);
124	}
125	return (error);
126}
127
128static int
129kdumpenv(void)
130{
131	char *buf, *cp;
132	int buflen, envlen;
133
134	envlen = kenv(KENV_DUMP, NULL, NULL, 0);
135	if (envlen < 0)
136		return (-1);
137	for (;;) {
138		buflen = envlen * 120 / 100;
139		buf = malloc(buflen + 1);
140		if (buf == NULL)
141			return (-1);
142		memset(buf, 0, buflen + 1);	/* Be defensive */
143		envlen = kenv(KENV_DUMP, NULL, buf, buflen);
144		if (envlen < 0) {
145			free(buf);
146			return (-1);
147		}
148		if (envlen > buflen)
149			free(buf);
150		else
151			break;
152	}
153
154	for (; *buf != '\0'; buf += strlen(buf) + 1) {
155		if (hflag) {
156			if (strncmp(buf, "hint.", 5) != 0)
157				continue;
158		}
159		cp = strchr(buf, '=');
160		if (cp == NULL)
161			continue;
162		*cp++ = '\0';
163		if (Nflag)
164			printf("%s\n", buf);
165		else
166			printf("%s=\"%s\"\n", buf, cp);
167		buf = cp;
168	}
169	return (0);
170}
171
172static int
173kgetenv(const char *env)
174{
175	char buf[1024];
176	int ret;
177
178	ret = kenv(KENV_GET, env, buf, sizeof(buf));
179	if (ret == -1)
180		return (ret);
181	if (vflag)
182		printf("%s=\"%s\"\n", env, buf);
183	else
184		printf("%s\n", buf);
185	return (0);
186}
187
188static int
189ksetenv(const char *env, char *val)
190{
191	int ret;
192
193	ret = kenv(KENV_SET, env, val, strlen(val)+1);
194	if (ret == 0)
195		printf("%s=\"%s\"\n", env, val);
196	return (ret);
197}
198
199static int
200kunsetenv(const char *env)
201{
202	int ret;
203
204	ret = kenv(KENV_UNSET, env, NULL, 0);
205	return (ret);
206}
207