Annotation of /trunk/mkinitrd-magellan/busybox/libbb/run_shell.c
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Revision 532 -
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 3292 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | niro | 532 | /* 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 | ||
44 | static security_context_t current_sid; | ||
45 | |||
46 | void | ||
47 | renew_current_security_context(void) | ||
48 | { | ||
49 | if (current_sid) | ||
50 | freecon(current_sid); /* Release old context */ | ||
51 | getcon(¤t_sid); /* update */ | ||
52 | } | ||
53 | void | ||
54 | set_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 | |||
68 | void 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 | } |