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 #include <sys/types.h> 46 47 #include <err.h> 48 #include <errno.h> 49 #include <login_cap.h> 50 #include <pwd.h> 51 #include <stdbool.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #include "envopts.h" 58 59 extern char **environ; 60 61 int env_verbosity; 62 63 static void usage(void) __dead2; 64 65 /* 66 * Exit codes. 67 */ 68 #define EXIT_CANCELED 125 /* Internal error prior to exec attempt. */ 69 #define EXIT_CANNOT_INVOKE 126 /* Program located, but not usable. */ 70 #define EXIT_ENOENT 127 /* Could not find program to exec. */ 71 72 int 73 main(int argc, char **argv) 74 { 75 char *altpath, **ep, *p, **parg, term; 76 char *cleanenv[1]; 77 char *login_class, *login_name; 78 struct passwd *pw; 79 login_cap_t *lc; 80 bool login_as_user; 81 uid_t uid; 82 int ch, want_clear; 83 int rtrn; 84 85 altpath = NULL; 86 login_class = NULL; 87 login_name = NULL; 88 pw = NULL; 89 lc = NULL; 90 login_as_user = false; 91 want_clear = 0; 92 term = '\n'; 93 while ((ch = getopt(argc, argv, "-0iL:P:S:U:u:v")) != -1) 94 switch(ch) { 95 case '-': 96 case 'i': 97 want_clear = 1; 98 break; 99 case '0': 100 term = '\0'; 101 break; 102 case 'U': 103 login_as_user = true; 104 /* FALLTHROUGH */ 105 case 'L': 106 login_name = optarg; 107 break; 108 case 'P': 109 altpath = strdup(optarg); 110 break; 111 case 'S': 112 /* 113 * The -S option, for "split string on spaces, with 114 * support for some simple substitutions"... 115 */ 116 split_spaces(optarg, &optind, &argc, &argv); 117 break; 118 case 'u': 119 if (env_verbosity) 120 fprintf(stderr, "#env unset:\t%s\n", optarg); 121 rtrn = unsetenv(optarg); 122 if (rtrn == -1) 123 err(EXIT_FAILURE, "unsetenv %s", optarg); 124 break; 125 case 'v': 126 env_verbosity++; 127 if (env_verbosity > 1) 128 fprintf(stderr, "#env verbosity now at %d\n", 129 env_verbosity); 130 break; 131 case '?': 132 default: 133 usage(); 134 } 135 if (want_clear) { 136 environ = cleanenv; 137 cleanenv[0] = NULL; 138 if (env_verbosity) 139 fprintf(stderr, "#env clearing environ\n"); 140 } 141 if (login_name != NULL) { 142 login_class = strchr(login_name, '/'); 143 if (login_class) 144 *login_class++ = '\0'; 145 if (*login_name != '\0' && strcmp(login_name, "-") != 0) { 146 pw = getpwnam(login_name); 147 if (pw == NULL) { 148 char *endp = NULL; 149 errno = 0; 150 uid = strtoul(login_name, &endp, 10); 151 if (errno == 0 && *endp == '\0') 152 pw = getpwuid(uid); 153 } 154 if (pw == NULL) 155 errx(EXIT_FAILURE, "no such user: %s", login_name); 156 } 157 /* 158 * Note that it is safe for pw to be null here; the libutil 159 * code handles that, bypassing substitution of $ and using 160 * the class "default" if no class name is given either. 161 */ 162 if (login_class != NULL) { 163 lc = login_getclass(login_class); 164 if (lc == NULL) 165 errx(EXIT_FAILURE, "no such login class: %s", 166 login_class); 167 } else { 168 lc = login_getpwclass(pw); 169 if (lc == NULL) 170 errx(EXIT_FAILURE, "login_getpwclass failed"); 171 } 172 173 /* 174 * This is not done with setusercontext() because that will 175 * try and use ~/.login_conf even when we don't want it to. 176 */ 177 setclassenvironment(lc, pw, 1); 178 setclassenvironment(lc, pw, 0); 179 if (login_as_user) { 180 login_close(lc); 181 if ((lc = login_getuserclass(pw)) != NULL) { 182 setclassenvironment(lc, pw, 1); 183 setclassenvironment(lc, pw, 0); 184 } 185 } 186 endpwent(); 187 if (lc != NULL) 188 login_close(lc); 189 } 190 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) { 191 if (env_verbosity) 192 fprintf(stderr, "#env setenv:\t%s\n", *argv); 193 *p = '\0'; 194 rtrn = setenv(*argv, p + 1, 1); 195 *p = '='; 196 if (rtrn == -1) 197 err(EXIT_FAILURE, "setenv %s", *argv); 198 } 199 if (*argv) { 200 if (term == '\0') 201 errx(EXIT_CANCELED, "cannot specify command with -0"); 202 if (altpath) 203 search_paths(altpath, argv); 204 if (env_verbosity) { 205 fprintf(stderr, "#env executing:\t%s\n", *argv); 206 for (parg = argv, argc = 0; *parg; parg++, argc++) 207 fprintf(stderr, "#env arg[%d]=\t'%s'\n", 208 argc, *parg); 209 if (env_verbosity > 1) 210 sleep(1); 211 } 212 execvp(*argv, argv); 213 err(errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE, 214 "%s", *argv); 215 } 216 for (ep = environ; *ep; ep++) 217 (void)printf("%s%c", *ep, term); 218 exit(0); 219 } 220 221 static void 222 usage(void) 223 { 224 (void)fprintf(stderr, 225 "usage: env [-0iv] [-L|-U user[/class]] [-P utilpath] [-S string] [-u name]\n" 226 " [name=value ...] [utility [argument ...]]\n"); 227 exit(1); 228 } 229