freebsd-dev/usr.bin/env/env.c
Kyle Evans 85c8521e67 env(1): grow -L user/class and -U user/class options
This allows one to set the environment of the specified user either from
login.conf alone (-L) or both login.conf and ~/.login_conf if present (-U).

This is a supporting feature to allow service(8) to pull in the environment
of the "daemon" class before invoking the rc script.

This is a part of D21481.

Submitted by:	Andrew Gierth < andrew_tao173.riddles.org.uk>
2020-02-05 04:29:55 +00:00

224 lines
5.9 KiB
C

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