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 33 static 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 40 static 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 61 extern char **environ; 62 63 int env_verbosity; 64 65 static 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 74 int 75 main(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 pw = getpwnam(login_name); 148 if (pw == NULL) { 149 char *endp = NULL; 150 errno = 0; 151 uid = strtoul(login_name, &endp, 10); 152 if (errno == 0 && *endp == '\0') 153 pw = getpwuid(uid); 154 } 155 if (pw == NULL) 156 errx(EXIT_FAILURE, "no such user: %s", login_name); 157 if (login_class != NULL) { 158 lc = login_getclass(login_class); 159 if (lc == NULL) 160 errx(EXIT_FAILURE, "no such login class: %s", 161 login_class); 162 } else { 163 lc = login_getpwclass(pw); 164 if (lc == NULL) 165 errx(EXIT_FAILURE, "login_getpwclass failed"); 166 } 167 168 /* 169 * This is not done with setusercontext() because that will 170 * try and use ~/.login_conf even when we don't want it to. 171 */ 172 setclassenvironment(lc, pw, 1); 173 setclassenvironment(lc, pw, 0); 174 if (login_as_user) { 175 login_close(lc); 176 if ((lc = login_getuserclass(pw)) != NULL) { 177 setclassenvironment(lc, pw, 1); 178 setclassenvironment(lc, pw, 0); 179 } 180 } 181 endpwent(); 182 if (lc != NULL) 183 login_close(lc); 184 } 185 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) { 186 if (env_verbosity) 187 fprintf(stderr, "#env setenv:\t%s\n", *argv); 188 *p = '\0'; 189 rtrn = setenv(*argv, p + 1, 1); 190 *p = '='; 191 if (rtrn == -1) 192 err(EXIT_FAILURE, "setenv %s", *argv); 193 } 194 if (*argv) { 195 if (term == '\0') 196 errx(EXIT_CANCELED, "cannot specify command with -0"); 197 if (altpath) 198 search_paths(altpath, argv); 199 if (env_verbosity) { 200 fprintf(stderr, "#env executing:\t%s\n", *argv); 201 for (parg = argv, argc = 0; *parg; parg++, argc++) 202 fprintf(stderr, "#env arg[%d]=\t'%s'\n", 203 argc, *parg); 204 if (env_verbosity > 1) 205 sleep(1); 206 } 207 execvp(*argv, argv); 208 err(errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE, 209 "%s", *argv); 210 } 211 for (ep = environ; *ep; ep++) 212 (void)printf("%s%c", *ep, term); 213 exit(0); 214 } 215 216 static void 217 usage(void) 218 { 219 (void)fprintf(stderr, 220 "usage: env [-0iv] [-L|-U user[/class]] [-P utilpath] [-S string] [-u name]\n" 221 " [name=value ...] [utility [argument ...]]\n"); 222 exit(1); 223 } 224