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 | * This program is free software; you can redistribute it and/or modify
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9 | * it under the terms of the GNU General Public License as published by
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10 | * the Free Software Foundation; either version 2 of the License, or
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11 | * (at your option) any later version.
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12 | *
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13 | * This program is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 | * General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with this program; if not, write to the Free Software
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20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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21 | *
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22 | * Original copyright notice is retained at the end of this file.
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23 | *
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24 | * Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
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25 | */
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26 |
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27 | /* BB_AUDIT SUSv3 compliant */
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28 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
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29 |
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30 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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31 | *
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32 | * Fixed bug involving exit return codes if execvp fails. Also added
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33 | * output error checking.
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34 | */
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35 |
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36 | /*
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37 | * Modified by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
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38 | * - correct "-" option usage
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39 | * - multiple "-u unsetenv" support
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40 | * - GNU long option support
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41 | * - use bb_default_error_retval
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42 | */
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43 |
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44 |
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45 | #include <stdio.h>
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46 | #include <string.h>
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47 | #include <stdlib.h>
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48 | #include <errno.h>
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49 | #include <unistd.h>
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50 | #include <getopt.h> /* struct option */
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51 | #include "busybox.h"
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52 |
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53 | #if ENABLE_FEATURE_ENV_LONG_OPTIONS
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54 | static const struct option env_long_options[] = {
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55 | { "ignore-environment", 0, NULL, 'i' },
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56 | { "unset", 1, NULL, 'u' },
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57 | { 0, 0, 0, 0 }
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58 | };
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59 | #endif
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60 |
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61 | int env_main(int argc, char** argv)
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62 | {
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63 | static char *cleanenv[1] = { NULL };
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64 |
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65 | char **ep, *p;
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66 | unsigned long opt;
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67 | llist_t *unset_env = NULL;
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68 | extern char **environ;
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69 |
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70 | bb_opt_complementally = "u::";
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71 | #if ENABLE_FEATURE_ENV_LONG_OPTIONS
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72 | bb_applet_long_options = env_long_options;
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73 | #endif
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74 |
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75 | opt = bb_getopt_ulflags(argc, argv, "+iu:", &unset_env);
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76 |
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77 | argv += optind;
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78 | if (*argv && (argv[0][0] == '-') && !argv[0][1]) {
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79 | opt |= 1;
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80 | ++argv;
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81 | }
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82 |
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83 | if(opt & 1)
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84 | environ = cleanenv;
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85 | else if(opt & 2) {
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86 | while(unset_env) {
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87 | unsetenv(unset_env->data);
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88 | unset_env = unset_env->link;
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89 | }
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90 | }
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91 |
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92 | while (*argv && ((p = strchr(*argv, '=')) != NULL)) {
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93 | if (putenv(*argv) < 0) {
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94 | bb_perror_msg_and_die("putenv");
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95 | }
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96 | ++argv;
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97 | }
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98 |
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99 | if (*argv) {
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100 | execvp(*argv, argv);
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101 | /* SUSv3-mandated exit codes. */
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102 | bb_default_error_retval = (errno == ENOENT) ? 127 : 126;
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103 | bb_perror_msg_and_die("%s", *argv);
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104 | }
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105 |
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106 | for (ep = environ; *ep; ep++) {
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107 | puts(*ep);
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108 | }
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109 |
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110 | bb_fflush_stdout_and_exit(0);
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111 | }
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112 |
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113 | /*
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114 | * Copyright (c) 1988, 1993, 1994
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115 | * The Regents of the University of California. All rights reserved.
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116 | *
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117 | * Redistribution and use in source and binary forms, with or without
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118 | * modification, are permitted provided that the following conditions
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119 | * are met:
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120 | * 1. Redistributions of source code must retain the above copyright
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121 | * notice, this list of conditions and the following disclaimer.
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122 | * 2. Redistributions in binary form must reproduce the above copyright
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123 | * notice, this list of conditions and the following disclaimer in the
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124 | * documentation and/or other materials provided with the distribution.
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125 | *
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126 | * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
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127 | * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
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128 | *
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129 | * 4. Neither the name of the University nor the names of its contributors
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130 | * may be used to endorse or promote products derived from this software
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131 | * without specific prior written permission.
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132 | *
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133 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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134 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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135 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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136 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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137 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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138 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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139 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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140 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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141 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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142 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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143 | * SUCH DAMAGE.
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144 | */
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145 |
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146 |
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