source: branches/stable/mindi-busybox/libbb/run_shell.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.3 KB
Line 
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=NULL;
45
46void
47renew_current_security_context(void)
48{
49  if  (current_sid)
50    freecon(current_sid);  /* Release old context  */
51
52  getcon(&current_sid);  /* update */
53
54  return;
55}
56void
57set_current_security_context(security_context_t sid)
58{
59  if  (current_sid)
60    freecon(current_sid);  /* Release old context  */
61
62  current_sid=sid;
63
64  return;
65}
66
67#endif
68
69/* Run SHELL, or DEFAULT_SHELL if SHELL is empty.
70   If COMMAND is nonzero, pass it to the shell with the -c option.
71   If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
72   arguments.  */
73
74void run_shell ( const char *shell, int loginshell, const char *command, const char **additional_args)
75{
76    const char **args;
77    int argno = 1;
78    int additional_args_cnt = 0;
79
80    for ( args = additional_args; args && *args; args++ )
81        additional_args_cnt++;
82
83        args = (const char **) xmalloc (sizeof (char *) * ( 4  + additional_args_cnt ));
84
85    args [0] = bb_get_last_path_component ( bb_xstrdup ( shell ));
86
87    if ( loginshell )
88        args [0] = bb_xasprintf ("-%s", args [0]);
89
90    if ( command ) {
91        args [argno++] = "-c";
92        args [argno++] = command;
93    }
94    if ( additional_args ) {
95        for ( ; *additional_args; ++additional_args )
96            args [argno++] = *additional_args;
97    }
98    args [argno] = 0;
99#ifdef CONFIG_SELINUX
100    if ( (current_sid) && (!setexeccon(current_sid)) ) {
101        freecon(current_sid);
102        execve(shell, (char **) args, environ);
103    } else
104#endif
105      execv ( shell, (char **) args );
106    bb_perror_msg_and_die ( "cannot run %s", shell );
107}
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