3
0

run_shell.c 3.1 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192
  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. #include "libbb.h"
  31. #if ENABLE_SELINUX
  32. #include <selinux/selinux.h> /* for setexeccon */
  33. #endif
  34. #if ENABLE_SELINUX
  35. static security_context_t current_sid;
  36. void FAST_FUNC renew_current_security_context(void)
  37. {
  38. freecon(current_sid); /* Release old context */
  39. getcon(&current_sid); /* update */
  40. }
  41. void FAST_FUNC set_current_security_context(security_context_t sid)
  42. {
  43. freecon(current_sid); /* Release old context */
  44. current_sid = sid;
  45. }
  46. #endif
  47. /* Run SHELL, or DEFAULT_SHELL if SHELL is "" or NULL.
  48. * If COMMAND is nonzero, pass it to the shell with the -c option.
  49. * If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
  50. * arguments. */
  51. void FAST_FUNC run_shell(const char *shell, int loginshell, const char *command, const char **additional_args)
  52. {
  53. const char **args;
  54. int argno;
  55. int additional_args_cnt = 0;
  56. for (args = additional_args; args && *args; args++)
  57. additional_args_cnt++;
  58. args = xmalloc(sizeof(char*) * (4 + additional_args_cnt));
  59. if (!shell || !shell[0])
  60. shell = DEFAULT_SHELL;
  61. args[0] = bb_get_last_path_component_nostrip(shell);
  62. if (loginshell)
  63. args[0] = xasprintf("-%s", args[0]);
  64. argno = 1;
  65. if (command) {
  66. args[argno++] = "-c";
  67. args[argno++] = command;
  68. }
  69. if (additional_args) {
  70. for (; *additional_args; ++additional_args)
  71. args[argno++] = *additional_args;
  72. }
  73. args[argno] = NULL;
  74. #if ENABLE_SELINUX
  75. if (current_sid)
  76. setexeccon(current_sid);
  77. if (ENABLE_FEATURE_CLEAN_UP)
  78. freecon(current_sid);
  79. #endif
  80. execv(shell, (char **) args);
  81. bb_perror_msg_and_die("can't execute '%s'", shell);
  82. }