| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * env implementation for busybox
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| 4 | *
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| 5 | * Copyright (c) 1988, 1993, 1994
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| 6 | * The Regents of the University of California. All rights reserved.
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| 7 | *
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| 8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 9 | *
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| 10 | * Original copyright notice is retained at the end of this file.
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| 11 | *
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| 12 | * Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
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| 13 | */
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| 14 |
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| 15 | /* BB_AUDIT SUSv3 compliant */
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| 16 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
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| 17 |
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| 18 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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| 19 | *
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| 20 | * Fixed bug involving exit return codes if execvp fails. Also added
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| 21 | * output error checking.
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| 22 | */
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| 23 |
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| 24 | /*
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| 25 | * Modified by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
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| 26 | * - correct "-" option usage
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| 27 | * - multiple "-u unsetenv" support
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| 28 | * - GNU long option support
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| 29 | * - use xfunc_error_retval
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| 30 | */
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| 31 |
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| 32 | /* This is a NOEXEC applet. Be very careful! */
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| 33 |
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| 34 | //usage:#define env_trivial_usage
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| 35 | //usage: "[-iu] [-] [name=value]... [PROG ARGS]"
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| 36 | //usage:#define env_full_usage "\n\n"
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| 37 | //usage: "Print the current environment or run PROG after setting up\n"
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| 38 | //usage: "the specified environment\n"
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| 39 | //usage: "\n -, -i Start with an empty environment"
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| 40 | //usage: "\n -u Remove variable from the environment"
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| 41 |
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| 42 | #include "libbb.h"
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| 43 |
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| 44 | #if ENABLE_FEATURE_ENV_LONG_OPTIONS
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| 45 | static const char env_longopts[] ALIGN1 =
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| 46 | "ignore-environment\0" No_argument "i"
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| 47 | "unset\0" Required_argument "u"
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| 48 | ;
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| 49 | #endif
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| 50 |
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| 51 | int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 52 | int env_main(int argc UNUSED_PARAM, char **argv)
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| 53 | {
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| 54 | unsigned opts;
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| 55 | llist_t *unset_env = NULL;
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| 56 |
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| 57 | opt_complementary = "u::";
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| 58 | #if ENABLE_FEATURE_ENV_LONG_OPTIONS
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| 59 | applet_long_options = env_longopts;
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| 60 | #endif
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| 61 | opts = getopt32(argv, "+iu:", &unset_env);
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| 62 | argv += optind;
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| 63 | if (argv[0] && LONE_DASH(argv[0])) {
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| 64 | opts |= 1;
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| 65 | ++argv;
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| 66 | }
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| 67 | if (opts & 1) {
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| 68 | clearenv();
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| 69 | }
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| 70 | while (unset_env) {
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| 71 | char *var = llist_pop(&unset_env);
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| 72 | /* This does not handle -uVAR=VAL
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| 73 | * (coreutils _sets_ the variable in that case): */
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| 74 | /*unsetenv(var);*/
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| 75 | /* This does, but uses somewhan undocumented feature that
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| 76 | * putenv("name_without_equal_sign") unsets the variable: */
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| 77 | putenv(var);
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| 78 | }
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| 79 |
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| 80 | while (*argv && (strchr(*argv, '=') != NULL)) {
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| 81 | if (putenv(*argv) < 0) {
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| 82 | bb_perror_msg_and_die("putenv");
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| 83 | }
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| 84 | ++argv;
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| 85 | }
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| 86 |
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| 87 | if (argv[0]) {
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| 88 | BB_EXECVP_or_die(argv);
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| 89 | }
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| 90 |
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| 91 | if (environ) { /* clearenv() may set environ == NULL! */
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| 92 | char **ep;
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| 93 | for (ep = environ; *ep; ep++) {
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| 94 | puts(*ep);
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| 95 | }
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| 96 | }
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| 97 |
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| 98 | fflush_stdout_and_exit(EXIT_SUCCESS);
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| 99 | }
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| 100 |
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| 101 | /*
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| 102 | * Copyright (c) 1988, 1993, 1994
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| 103 | * The Regents of the University of California. All rights reserved.
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| 104 | *
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| 105 | * Redistribution and use in source and binary forms, with or without
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| 106 | * modification, are permitted provided that the following conditions
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| 107 | * are met:
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| 108 | * 1. Redistributions of source code must retain the above copyright
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| 109 | * notice, this list of conditions and the following disclaimer.
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| 110 | * 2. Redistributions in binary form must reproduce the above copyright
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| 111 | * notice, this list of conditions and the following disclaimer in the
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| 112 | * documentation and/or other materials provided with the distribution.
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| 113 | *
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| 114 | * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
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| 115 | * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
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| 116 | *
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| 117 | * 4. Neither the name of the University nor the names of its contributors
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| 118 | * may be used to endorse or promote products derived from this software
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| 119 | * without specific prior written permission.
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| 120 | *
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| 121 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 122 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 123 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 124 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 125 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 126 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 127 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 128 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 129 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 130 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 131 | * SUCH DAMAGE.
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| 132 | */
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