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-rw-r--r--libbb/run_shell.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/libbb/run_shell.c b/libbb/run_shell.c
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1/* vi: set sw=4 ts=4: */
2/*
3 * Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <stdio.h>
32#include <errno.h>
33#include <unistd.h>
34#include <string.h>
35#include <stdlib.h>
36#include <syslog.h>
37#include <ctype.h>
38#include "libbb.h"
39#ifdef CONFIG_SELINUX
40#include <selinux/selinux.h> /* for setexeccon */
41#endif
42
43#ifdef CONFIG_SELINUX
44static security_context_t current_sid;
45
46void
47renew_current_security_context(void)
48{
49 if (current_sid)
50 freecon(current_sid); /* Release old context */
51 getcon(&current_sid); /* update */
52}
53void
54set_current_security_context(security_context_t sid)
55{
56 if (current_sid)
57 freecon(current_sid); /* Release old context */
58 current_sid = sid;
59}
60
61#endif
62
63/* Run SHELL, or DEFAULT_SHELL if SHELL is empty.
64 If COMMAND is nonzero, pass it to the shell with the -c option.
65 If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
66 arguments. */
67
68void run_shell(const char *shell, int loginshell, const char *command, const char **additional_args)
69{
70 const char **args;
71 int argno = 1;
72 int additional_args_cnt = 0;
73
74 for (args = additional_args; args && *args; args++)
75 additional_args_cnt++;
76
77 args = xmalloc(sizeof(char*) * (4 + additional_args_cnt));
78
79 args[0] = bb_get_last_path_component(xstrdup(shell));
80
81 if (loginshell)
82 args[0] = xasprintf("-%s", args[0]);
83
84 if (command) {
85 args[argno++] = "-c";
86 args[argno++] = command;
87 }
88 if (additional_args) {
89 for (; *additional_args; ++additional_args)
90 args[argno++] = *additional_args;
91 }
92 args[argno] = NULL;
93#ifdef CONFIG_SELINUX
94 if (current_sid && !setexeccon(current_sid)) {
95 freecon(current_sid);
96 execve(shell, (char **) args, environ);
97 } else
98#endif
99 execv(shell, (char **) args);
100 bb_perror_msg_and_die("cannot run %s", shell);
101}