231 lines
6.1 KiB
C
231 lines
6.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1988, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)env.c 8.3 (Berkeley) 4/2/94";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <login_cap.h>
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#include <pwd.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "envopts.h"
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extern char **environ;
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int env_verbosity;
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static void usage(void);
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/*
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* Exit codes.
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*/
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#define EXIT_CANCELED 125 /* Internal error prior to exec attempt. */
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#define EXIT_CANNOT_INVOKE 126 /* Program located, but not usable. */
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#define EXIT_ENOENT 127 /* Could not find program to exec. */
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int
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main(int argc, char **argv)
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{
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char *altpath, **ep, *p, **parg, term;
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char *cleanenv[1];
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char *login_class, *login_name;
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struct passwd *pw;
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login_cap_t *lc;
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bool login_as_user;
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uid_t uid;
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int ch, want_clear;
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int rtrn;
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altpath = NULL;
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login_class = NULL;
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login_name = NULL;
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pw = NULL;
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lc = NULL;
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login_as_user = false;
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want_clear = 0;
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term = '\n';
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while ((ch = getopt(argc, argv, "-0iL:P:S:U:u:v")) != -1)
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switch(ch) {
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case '-':
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case 'i':
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want_clear = 1;
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break;
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case '0':
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term = '\0';
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break;
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case 'U':
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login_as_user = true;
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/* FALLTHROUGH */
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case 'L':
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login_name = optarg;
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break;
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case 'P':
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altpath = strdup(optarg);
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break;
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case 'S':
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/*
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* The -S option, for "split string on spaces, with
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* support for some simple substitutions"...
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*/
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split_spaces(optarg, &optind, &argc, &argv);
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break;
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case 'u':
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if (env_verbosity)
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fprintf(stderr, "#env unset:\t%s\n", optarg);
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rtrn = unsetenv(optarg);
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if (rtrn == -1)
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err(EXIT_FAILURE, "unsetenv %s", optarg);
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break;
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case 'v':
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env_verbosity++;
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if (env_verbosity > 1)
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fprintf(stderr, "#env verbosity now at %d\n",
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env_verbosity);
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break;
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case '?':
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default:
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usage();
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}
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if (want_clear) {
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environ = cleanenv;
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cleanenv[0] = NULL;
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if (env_verbosity)
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fprintf(stderr, "#env clearing environ\n");
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}
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if (login_name != NULL) {
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login_class = strchr(login_name, '/');
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if (login_class)
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*login_class++ = '\0';
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if (*login_name != '\0' && strcmp(login_name, "-") != 0) {
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pw = getpwnam(login_name);
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if (pw == NULL) {
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char *endp = NULL;
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errno = 0;
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uid = strtoul(login_name, &endp, 10);
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if (errno == 0 && *endp == '\0')
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pw = getpwuid(uid);
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}
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if (pw == NULL)
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errx(EXIT_FAILURE, "no such user: %s", login_name);
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}
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/*
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* Note that it is safe for pw to be null here; the libutil
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* code handles that, bypassing substitution of $ and using
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* the class "default" if no class name is given either.
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*/
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if (login_class != NULL) {
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lc = login_getclass(login_class);
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if (lc == NULL)
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errx(EXIT_FAILURE, "no such login class: %s",
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login_class);
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} else {
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lc = login_getpwclass(pw);
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if (lc == NULL)
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errx(EXIT_FAILURE, "login_getpwclass failed");
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}
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/*
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* This is not done with setusercontext() because that will
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* try and use ~/.login_conf even when we don't want it to.
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*/
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setclassenvironment(lc, pw, 1);
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setclassenvironment(lc, pw, 0);
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if (login_as_user) {
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login_close(lc);
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if ((lc = login_getuserclass(pw)) != NULL) {
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setclassenvironment(lc, pw, 1);
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setclassenvironment(lc, pw, 0);
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}
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}
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endpwent();
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if (lc != NULL)
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login_close(lc);
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}
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for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) {
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if (env_verbosity)
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fprintf(stderr, "#env setenv:\t%s\n", *argv);
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*p = '\0';
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rtrn = setenv(*argv, p + 1, 1);
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*p = '=';
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if (rtrn == -1)
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err(EXIT_FAILURE, "setenv %s", *argv);
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}
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if (*argv) {
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if (term == '\0')
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errx(EXIT_CANCELED, "cannot specify command with -0");
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if (altpath)
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search_paths(altpath, argv);
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if (env_verbosity) {
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fprintf(stderr, "#env executing:\t%s\n", *argv);
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for (parg = argv, argc = 0; *parg; parg++, argc++)
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fprintf(stderr, "#env arg[%d]=\t'%s'\n",
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argc, *parg);
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if (env_verbosity > 1)
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sleep(1);
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}
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execvp(*argv, argv);
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err(errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE,
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"%s", *argv);
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}
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for (ep = environ; *ep; ep++)
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(void)printf("%s%c", *ep, term);
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exit(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: env [-0iv] [-L|-U user[/class]] [-P utilpath] [-S string] [-u name]\n"
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" [name=value ...] [utility [argument ...]]\n");
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exit(1);
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}
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