Contents of /trunk/mkinitrd-magellan/busybox/libbb/run_shell.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 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 | /* 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 | } |