blob: e91eddb5c8b4015b0827df7f44ffad3f0af500ef
| 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" |
| 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 | //config: |
| 34 | //config:config FEATURE_ENV_LONG_OPTIONS |
| 35 | //config: bool "Enable long options" |
| 36 | //config: default y |
| 37 | //config: depends on ENV && LONG_OPTS |
| 38 | //config: help |
| 39 | //config: Support long options for the env applet. |
| 40 | |
| 41 | //applet:IF_ENV(APPLET_NOEXEC(env, env, BB_DIR_USR_BIN, BB_SUID_DROP, env)) |
| 42 | |
| 43 | //kbuild:lib-$(CONFIG_ENV) += env.o |
| 44 | |
| 45 | /* BB_AUDIT SUSv3 compliant */ |
| 46 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */ |
| 47 | |
| 48 | //usage:#define env_trivial_usage |
| 49 | //usage: "[-iu] [-] [name=value]... [PROG ARGS]" |
| 50 | //usage:#define env_full_usage "\n\n" |
| 51 | //usage: "Print the current environment or run PROG after setting up\n" |
| 52 | //usage: "the specified environment\n" |
| 53 | //usage: "\n -, -i Start with an empty environment" |
| 54 | //usage: "\n -u Remove variable from the environment" |
| 55 | |
| 56 | #include "libbb.h" |
| 57 | |
| 58 | #if ENABLE_FEATURE_ENV_LONG_OPTIONS |
| 59 | static const char env_longopts[] ALIGN1 = |
| 60 | "ignore-environment\0" No_argument "i" |
| 61 | "unset\0" Required_argument "u" |
| 62 | ; |
| 63 | #endif |
| 64 | |
| 65 | int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 66 | int env_main(int argc UNUSED_PARAM, char **argv) |
| 67 | { |
| 68 | unsigned opts; |
| 69 | llist_t *unset_env = NULL; |
| 70 | |
| 71 | #if ENABLE_FEATURE_ENV_LONG_OPTIONS |
| 72 | applet_long_options = env_longopts; |
| 73 | #endif |
| 74 | opts = getopt32(argv, "+iu:+", &unset_env); |
| 75 | argv += optind; |
| 76 | if (argv[0] && LONE_DASH(argv[0])) { |
| 77 | opts |= 1; |
| 78 | ++argv; |
| 79 | } |
| 80 | if (opts & 1) { |
| 81 | clearenv(); |
| 82 | } |
| 83 | while (unset_env) { |
| 84 | char *var = llist_pop(&unset_env); |
| 85 | /* This does not handle -uVAR=VAL |
| 86 | * (coreutils _sets_ the variable in that case): */ |
| 87 | /*unsetenv(var);*/ |
| 88 | /* This does, but uses somewhan undocumented feature that |
| 89 | * putenv("name_without_equal_sign") unsets the variable: */ |
| 90 | putenv(var); |
| 91 | } |
| 92 | |
| 93 | while (*argv && (strchr(*argv, '=') != NULL)) { |
| 94 | if (putenv(*argv) < 0) { |
| 95 | bb_perror_msg_and_die("putenv"); |
| 96 | } |
| 97 | ++argv; |
| 98 | } |
| 99 | |
| 100 | if (argv[0]) { |
| 101 | BB_EXECVP_or_die(argv); |
| 102 | } |
| 103 | |
| 104 | if (environ) { /* clearenv() may set environ == NULL! */ |
| 105 | char **ep; |
| 106 | for (ep = environ; *ep; ep++) { |
| 107 | puts(*ep); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | fflush_stdout_and_exit(EXIT_SUCCESS); |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * Copyright (c) 1988, 1993, 1994 |
| 116 | * The Regents of the University of California. All rights reserved. |
| 117 | * |
| 118 | * Redistribution and use in source and binary forms, with or without |
| 119 | * modification, are permitted provided that the following conditions |
| 120 | * are met: |
| 121 | * 1. Redistributions of source code must retain the above copyright |
| 122 | * notice, this list of conditions and the following disclaimer. |
| 123 | * 2. Redistributions in binary form must reproduce the above copyright |
| 124 | * notice, this list of conditions and the following disclaimer in the |
| 125 | * documentation and/or other materials provided with the distribution. |
| 126 | * |
| 127 | * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change |
| 128 | * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change |
| 129 | * |
| 130 | * 4. Neither the name of the University nor the names of its contributors |
| 131 | * may be used to endorse or promote products derived from this software |
| 132 | * without specific prior written permission. |
| 133 | * |
| 134 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 135 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 136 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 137 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 138 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 139 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 140 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 141 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 142 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 143 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 144 | * SUCH DAMAGE. |
| 145 | */ |
| 146 |