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
38 static void usage(void);
39 static int kdumpenv(void);
40 static int kgetenv(const char *);
41 static int ksetenv(const char *, char *);
42 static int kunsetenv(const char *);
43
44 static int hflag = 0;
45 static int Nflag = 0;
46 static int qflag = 0;
47 static int uflag = 0;
48 static int vflag = 0;
49
50 static void
usage(void)51 usage(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
60 int
main(int argc,char ** argv)61 main(int argc, char **argv)
62 {
63 char *env, *eq, *val;
64 int ch, error;
65
66 val = NULL;
67 env = NULL;
68 while ((ch = getopt(argc, argv, "hNquv")) != -1) {
69 switch (ch) {
70 case 'h':
71 hflag++;
72 break;
73 case 'N':
74 Nflag++;
75 break;
76 case 'q':
77 qflag++;
78 break;
79 case 'u':
80 uflag++;
81 break;
82 case 'v':
83 vflag++;
84 break;
85 default:
86 usage();
87 }
88 }
89 argc -= optind;
90 argv += optind;
91 if (argc > 0) {
92 env = argv[0];
93 eq = strchr(env, '=');
94 if (eq != NULL) {
95 *eq++ = '\0';
96 val = eq;
97 }
98 argv++;
99 argc--;
100 }
101 if ((hflag || Nflag) && env != NULL)
102 usage();
103 if (argc > 0 || ((uflag || vflag) && env == NULL))
104 usage();
105 if (env == NULL) {
106 error = kdumpenv();
107 if (error && !qflag)
108 warn("kdumpenv");
109 } else if (val == NULL) {
110 if (uflag) {
111 error = kunsetenv(env);
112 if (error && !qflag)
113 warnx("unable to unset %s", env);
114 } else {
115 error = kgetenv(env);
116 if (error && !qflag)
117 warnx("unable to get %s", env);
118 }
119 } else {
120 error = ksetenv(env, val);
121 if (error && !qflag)
122 warnx("unable to set %s to %s", env, val);
123 }
124 return (error);
125 }
126
127 static int
kdumpenv(void)128 kdumpenv(void)
129 {
130 char *buf, *bp, *cp;
131 int buflen, envlen;
132
133 envlen = kenv(KENV_DUMP, NULL, NULL, 0);
134 if (envlen < 0)
135 return (-1);
136 for (;;) {
137 buflen = envlen * 120 / 100;
138 buf = calloc(1, buflen + 1);
139 if (buf == NULL)
140 return (-1);
141 envlen = kenv(KENV_DUMP, NULL, buf, buflen);
142 if (envlen < 0) {
143 free(buf);
144 return (-1);
145 }
146 if (envlen > buflen)
147 free(buf);
148 else
149 break;
150 }
151
152 for (bp = buf; *bp != '\0'; bp += strlen(bp) + 1) {
153 if (hflag) {
154 if (strncmp(bp, "hint.", 5) != 0)
155 continue;
156 }
157 cp = strchr(bp, '=');
158 if (cp == NULL)
159 continue;
160 *cp++ = '\0';
161 if (Nflag)
162 printf("%s\n", bp);
163 else
164 printf("%s=\"%s\"\n", bp, cp);
165 bp = cp;
166 }
167
168 free(buf);
169 return (0);
170 }
171
172 static int
kgetenv(const char * env)173 kgetenv(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
188 static int
ksetenv(const char * env,char * val)189 ksetenv(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
199 static int
kunsetenv(const char * env)200 kunsetenv(const char *env)
201 {
202 int ret;
203
204 ret = kenv(KENV_UNSET, env, NULL, 0);
205 return (ret);
206 }
207