1 /* vi: set sw=4 ts=4: */
2 /*
3 * env implementation for busybox
4 *
5 * Copyright (c) 1988, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
9 *
10 * Original copyright notice is retained at the end of this file.
11 *
12 * Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
13 */
14 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
15 *
16 * Fixed bug involving exit return codes if execvp fails. Also added
17 * output error checking.
18 */
19 /*
20 * Modified by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
21 * - correct "-" option usage
22 * - multiple "-u unsetenv" support
23 * - GNU long option support
24 * - use xfunc_error_retval
25 */
26 //config:config ENV
27 //config: bool "env (4 kb)"
28 //config: default y
29 //config: help
30 //config: env is used to set an environment variable and run
31 //config: a command; without options it displays the current
32 //config: environment.
33
34 //applet:IF_ENV(APPLET_NOEXEC(env, env, BB_DIR_USR_BIN, BB_SUID_DROP, env))
35
36 //kbuild:lib-$(CONFIG_ENV) += env.o
37
38 /* BB_AUDIT SUSv3 compliant */
39 /* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
40
41 //usage:#define env_trivial_usage
42 //usage: "[-i0] [-u NAME]... [-] [NAME=VALUE]... [PROG ARGS]"
43 // The "-" can occur only once (unlike, say, -i): it terminates option processing,
44 // so if it is followed by another "-" arg (or any option-looking arg),
45 // that arg will be taken as PROG (or even as NAME=VALUE, example: "-z=QWE").
46 //usage:#define env_full_usage "\n\n"
47 //usage: "Print current environment or run PROG after setting up environment\n"
48 //usage: "\n -, -i Start with empty environment"
49 //usage: "\n -0 NUL terminated output"
50 //usage: "\n -u NAME Remove variable from environment"
51
52 #include "libbb.h"
53
54 int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
env_main(int argc UNUSED_PARAM,char ** argv)55 int env_main(int argc UNUSED_PARAM, char **argv)
56 {
57 unsigned opts;
58 llist_t *unset_env = NULL;
59
60 opts = getopt32long(argv, "+i0u:*",
61 "ignore-environment\0" No_argument "i"
62 "null\0" No_argument "0"
63 "unset\0" Required_argument "u"
64 , &unset_env
65 );
66 argv += optind;
67 if (argv[0] && LONE_DASH(argv[0])) {
68 opts |= 1;
69 ++argv;
70 }
71 if (opts & 1) {
72 clearenv();
73 }
74 while (unset_env) {
75 char *var = llist_pop(&unset_env);
76 /* This does not handle -uVAR=VAL
77 * (coreutils _sets_ the variable in that case): */
78 /*unsetenv(var);*/
79 /* This does, but uses somewhan undocumented feature that
80 * putenv("name_without_equal_sign") unsets the variable: */
81 putenv(var);
82 }
83
84 while (*argv && (strchr(*argv, '=') != NULL)) {
85 if (putenv(*argv) < 0) {
86 bb_simple_perror_msg_and_die("putenv");
87 }
88 ++argv;
89 }
90
91 if (argv[0]) {
92 BB_EXECVP_or_die(argv);
93 }
94
95 if (environ) { /* clearenv() may set environ == NULL! */
96 char **ep;
97 opts = (opts & 2) ? 0 : '\n';
98 for (ep = environ; *ep; ep++) {
99 printf("%s%c", *ep, opts);
100 }
101 }
102
103 fflush_stdout_and_exit(EXIT_SUCCESS);
104 }
105
106 /*
107 * Copyright (c) 1988, 1993, 1994
108 * The Regents of the University of California. All rights reserved.
109 *
110 * Redistribution and use in source and binary forms, with or without
111 * modification, are permitted provided that the following conditions
112 * are met:
113 * 1. Redistributions of source code must retain the above copyright
114 * notice, this list of conditions and the following disclaimer.
115 * 2. Redistributions in binary form must reproduce the above copyright
116 * notice, this list of conditions and the following disclaimer in the
117 * documentation and/or other materials provided with the distribution.
118 *
119 * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
120 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
121 *
122 * 4. Neither the name of the University nor the names of its contributors
123 * may be used to endorse or promote products derived from this software
124 * without specific prior written permission.
125 *
126 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND
127 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
128 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
129 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
130 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
131 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
132 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
133 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
134 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
135 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
136 * SUCH DAMAGE.
137 */
138