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
main(int argc,char ** argv)73 main(int argc, char **argv)
74 {
75 char *altpath, *altwd, **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 altwd = NULL;
87 login_class = NULL;
88 login_name = NULL;
89 pw = NULL;
90 lc = NULL;
91 login_as_user = false;
92 want_clear = 0;
93 term = '\n';
94 while ((ch = getopt(argc, argv, "-0C:iL:P:S:U:u:v")) != -1)
95 switch(ch) {
96 case '-':
97 case 'i':
98 want_clear = 1;
99 break;
100 case '0':
101 term = '\0';
102 break;
103 case 'C':
104 altwd = optarg;
105 break;
106 case 'U':
107 login_as_user = true;
108 /* FALLTHROUGH */
109 case 'L':
110 login_name = optarg;
111 break;
112 case 'P':
113 altpath = optarg;
114 break;
115 case 'S':
116 /*
117 * The -S option, for "split string on spaces, with
118 * support for some simple substitutions"...
119 */
120 split_spaces(optarg, &optind, &argc, &argv);
121 break;
122 case 'u':
123 if (env_verbosity)
124 fprintf(stderr, "#env unset:\t%s\n", optarg);
125 rtrn = unsetenv(optarg);
126 if (rtrn == -1)
127 err(EXIT_FAILURE, "unsetenv %s", optarg);
128 break;
129 case 'v':
130 env_verbosity++;
131 if (env_verbosity > 1)
132 fprintf(stderr, "#env verbosity now at %d\n",
133 env_verbosity);
134 break;
135 case '?':
136 default:
137 usage();
138 }
139 if (want_clear) {
140 environ = cleanenv;
141 cleanenv[0] = NULL;
142 if (env_verbosity)
143 fprintf(stderr, "#env clearing environ\n");
144 }
145 if (login_name != NULL) {
146 login_class = strchr(login_name, '/');
147 if (login_class)
148 *login_class++ = '\0';
149 if (*login_name != '\0' && strcmp(login_name, "-") != 0) {
150 pw = getpwnam(login_name);
151 if (pw == NULL) {
152 char *endp = NULL;
153 errno = 0;
154 uid = strtoul(login_name, &endp, 10);
155 if (errno == 0 && *endp == '\0')
156 pw = getpwuid(uid);
157 }
158 if (pw == NULL)
159 errx(EXIT_FAILURE, "no such user: %s", login_name);
160 }
161 /*
162 * Note that it is safe for pw to be null here; the libutil
163 * code handles that, bypassing substitution of $ and using
164 * the class "default" if no class name is given either.
165 */
166 if (login_class != NULL) {
167 lc = login_getclass(login_class);
168 if (lc == NULL)
169 errx(EXIT_FAILURE, "no such login class: %s",
170 login_class);
171 } else {
172 lc = login_getpwclass(pw);
173 if (lc == NULL)
174 errx(EXIT_FAILURE, "login_getpwclass failed");
175 }
176
177 /*
178 * This is not done with setusercontext() because that will
179 * try and use ~/.login_conf even when we don't want it to.
180 */
181 setclassenvironment(lc, pw, 1);
182 setclassenvironment(lc, pw, 0);
183 if (login_as_user) {
184 login_close(lc);
185 if ((lc = login_getuserclass(pw)) != NULL) {
186 setclassenvironment(lc, pw, 1);
187 setclassenvironment(lc, pw, 0);
188 }
189 }
190 endpwent();
191 if (lc != NULL)
192 login_close(lc);
193 }
194 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) {
195 if (env_verbosity)
196 fprintf(stderr, "#env setenv:\t%s\n", *argv);
197 *p = '\0';
198 rtrn = setenv(*argv, p + 1, 1);
199 *p = '=';
200 if (rtrn == -1)
201 err(EXIT_FAILURE, "setenv %s", *argv);
202 }
203 if (*argv) {
204 if (term == '\0')
205 errx(EXIT_CANCELED, "cannot specify command with -0");
206 if (altwd && chdir(altwd) != 0)
207 err(EXIT_CANCELED, "cannot change directory to '%s'",
208 altwd);
209 if (altpath)
210 search_paths(altpath, argv);
211 if (env_verbosity) {
212 fprintf(stderr, "#env executing:\t%s\n", *argv);
213 for (parg = argv, argc = 0; *parg; parg++, argc++)
214 fprintf(stderr, "#env arg[%d]=\t'%s'\n",
215 argc, *parg);
216 if (env_verbosity > 1)
217 sleep(1);
218 }
219 execvp(*argv, argv);
220 err(errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE,
221 "%s", *argv);
222 } else {
223 if (altwd)
224 errx(EXIT_CANCELED, "must specify command with -C");
225 if (altpath)
226 errx(EXIT_CANCELED, "must specify command with -P");
227 }
228 for (ep = environ; *ep; ep++)
229 (void)printf("%s%c", *ep, term);
230 if (fflush(stdout) != 0)
231 err(1, "stdout");
232 exit(0);
233 }
234
235 static void
usage(void)236 usage(void)
237 {
238 (void)fprintf(stderr,
239 "usage: env [-0iv] [-C workdir] [-L|-U user[/class]] [-P utilpath] [-S string]\n"
240 " [-u name] [name=value ...] [utility [argument ...]]\n");
241 exit(1);
242 }
243