LXR busybox/libbb/run

   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 "libbb.h"
  32#if ENABLE_SELINUX
  33#include <selinux/selinux.h>  /* for setexeccon  */
  34#endif
  35
  36#if ENABLE_SELINUX
  37static security_context_t current_sid;
  38
  39void FAST_FUNC renew_current_security_context(void)
  40{
  41        freecon(current_sid);  /* Release old context  */
  42        getcon(&current_sid);  /* update */
  43}
  44void FAST_FUNC set_current_security_context(security_context_t sid)
  45{
  46        freecon(current_sid);  /* Release old context  */
  47        current_sid = sid;
  48}
  49
  50#endif
  51
  52/* Run SHELL, or DEFAULT_SHELL if SHELL is "" or NULL.
  53 * If COMMAND is nonzero, pass it to the shell with the -c option.
  54 * If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
  55 * arguments.  */
  56void FAST_FUNC run_shell(const char *shell, int loginshell, const char *command, const char **additional_args)
  57{
  58        const char **args;
  59        int argno;
  60        int additional_args_cnt = 0;
  61
  62        for (args = additional_args; args && *args; args++)
  63                additional_args_cnt++;
  64
  65        args = xmalloc(sizeof(char*) * (4 + additional_args_cnt));
  66
  67        if (!shell || !shell[0])
  68                shell = DEFAULT_SHELL;
  69
  70        args[0] = bb_get_last_path_component_nostrip(shell);
  71        if (loginshell)
  72                args[0] = xasprintf("-%s", args[0]);
  73        argno = 1;
  74        if (command) {
  75                args[argno++] = "-c";
  76                args[argno++] = command;
  77        }
  78        if (additional_args) {
  79                for (; *additional_args; ++additional_args)
  80                        args[argno++] = *additional_args;
  81        }
  82        args[argno] = NULL;
  83
  84#if ENABLE_SELINUX
  85        if (current_sid)
  86                setexeccon(current_sid);
  87        if (ENABLE_FEATURE_CLEAN_UP)
  88                freecon(current_sid);
  89#endif
  90        execv(shell, (char **) args);
  91        bb_perror_msg_and_die("can't execute '%s'", shell);
  92}
  93