1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#ifndef lint 33static const char copyright[] = 34"@(#) Copyright (c) 1988, 1993, 1994\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36#endif /* not lint */ 37 38#if 0 39#ifndef lint 40static char sccsid[] = "@(#)env.c 8.3 (Berkeley) 4/2/94"; 41#endif /* not lint */ 42#endif 43 44#include <sys/cdefs.h> 45__FBSDID("$FreeBSD$"); 46 47#include <sys/types.h> 48 49#include <err.h> 50#include <errno.h> 51#include <login_cap.h> 52#include <pwd.h> 53#include <stdbool.h> 54#include <stdio.h> 55#include <stdlib.h> 56#include <string.h> 57#include <unistd.h> 58 59#include "envopts.h" 60 61extern char **environ; 62 63int env_verbosity; 64 65static void usage(void); 66 67/* 68 * Exit codes. 69 */ 70#define EXIT_CANCELED 125 /* Internal error prior to exec attempt. */ 71#define EXIT_CANNOT_INVOKE 126 /* Program located, but not usable. */ 72#define EXIT_ENOENT 127 /* Could not find program to exec. */ 73 74int 75main(int argc, char **argv) 76{ 77 char *altpath, **ep, *p, **parg, term; 78 char *cleanenv[1]; 79 char *login_class, *login_name; 80 struct passwd *pw; 81 login_cap_t *lc; 82 bool login_as_user; 83 uid_t uid; 84 int ch, want_clear; 85 int rtrn; 86 87 altpath = NULL; 88 login_class = NULL; 89 login_name = NULL; 90 pw = NULL; 91 lc = NULL; 92 login_as_user = false; 93 want_clear = 0; 94 term = '\n'; 95 while ((ch = getopt(argc, argv, "-0iL:P:S:U:u:v")) != -1) 96 switch(ch) { 97 case '-': 98 case 'i': 99 want_clear = 1; 100 break; 101 case '0': 102 term = '\0'; 103 break; 104 case 'U': 105 login_as_user = true; 106 /* FALLTHROUGH */ 107 case 'L': 108 login_name = optarg; 109 break; 110 case 'P': 111 altpath = strdup(optarg); 112 break; 113 case 'S': 114 /* 115 * The -S option, for "split string on spaces, with 116 * support for some simple substitutions"... 117 */ 118 split_spaces(optarg, &optind, &argc, &argv); 119 break; 120 case 'u': 121 if (env_verbosity) 122 fprintf(stderr, "#env unset:\t%s\n", optarg); 123 rtrn = unsetenv(optarg); 124 if (rtrn == -1) 125 err(EXIT_FAILURE, "unsetenv %s", optarg); 126 break; 127 case 'v': 128 env_verbosity++; 129 if (env_verbosity > 1) 130 fprintf(stderr, "#env verbosity now at %d\n", 131 env_verbosity); 132 break; 133 case '?': 134 default: 135 usage(); 136 } 137 if (want_clear) { 138 environ = cleanenv; 139 cleanenv[0] = NULL; 140 if (env_verbosity) 141 fprintf(stderr, "#env clearing environ\n"); 142 } 143 if (login_name != NULL) { 144 login_class = strchr(login_name, '/'); 145 if (login_class) 146 *login_class++ = '\0'; 147 if (*login_name != '\0' && strcmp(login_name, "-") != 0) { 148 pw = getpwnam(login_name); 149 if (pw == NULL) { 150 char *endp = NULL; 151 errno = 0; 152 uid = strtoul(login_name, &endp, 10); 153 if (errno == 0 && *endp == '\0') 154 pw = getpwuid(uid); 155 } 156 if (pw == NULL) 157 errx(EXIT_FAILURE, "no such user: %s", login_name); 158 } 159 /* 160 * Note that it is safe for pw to be null here; the libutil 161 * code handles that, bypassing substitution of $ and using 162 * the class "default" if no class name is given either. 163 */ 164 if (login_class != NULL) { 165 lc = login_getclass(login_class); 166 if (lc == NULL) 167 errx(EXIT_FAILURE, "no such login class: %s", 168 login_class); 169 } else { 170 lc = login_getpwclass(pw); 171 if (lc == NULL) 172 errx(EXIT_FAILURE, "login_getpwclass failed"); 173 } 174 175 /* 176 * This is not done with setusercontext() because that will 177 * try and use ~/.login_conf even when we don't want it to. 178 */ 179 setclassenvironment(lc, pw, 1); 180 setclassenvironment(lc, pw, 0); 181 if (login_as_user) { 182 login_close(lc); 183 if ((lc = login_getuserclass(pw)) != NULL) { 184 setclassenvironment(lc, pw, 1); 185 setclassenvironment(lc, pw, 0); 186 } 187 } 188 endpwent(); 189 if (lc != NULL) 190 login_close(lc); 191 } 192 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) { 193 if (env_verbosity) 194 fprintf(stderr, "#env setenv:\t%s\n", *argv); 195 *p = '\0'; 196 rtrn = setenv(*argv, p + 1, 1); 197 *p = '='; 198 if (rtrn == -1) 199 err(EXIT_FAILURE, "setenv %s", *argv); 200 } 201 if (*argv) { 202 if (term == '\0') 203 errx(EXIT_CANCELED, "cannot specify command with -0"); 204 if (altpath) 205 search_paths(altpath, argv); 206 if (env_verbosity) { 207 fprintf(stderr, "#env executing:\t%s\n", *argv); 208 for (parg = argv, argc = 0; *parg; parg++, argc++) 209 fprintf(stderr, "#env arg[%d]=\t'%s'\n", 210 argc, *parg); 211 if (env_verbosity > 1) 212 sleep(1); 213 } 214 execvp(*argv, argv); 215 err(errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE, 216 "%s", *argv); 217 } 218 for (ep = environ; *ep; ep++) 219 (void)printf("%s%c", *ep, term); 220 exit(0); 221} 222 223static void 224usage(void) 225{ 226 (void)fprintf(stderr, 227 "usage: env [-0iv] [-L|-U user[/class]] [-P utilpath] [-S string] [-u name]\n" 228 " [name=value ...] [utility [argument ...]]\n"); 229 exit(1); 230} 231