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setup_environment.c 2.8 KB

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  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. void FAST_FUNC setup_environment(const char *shell, int flags, const struct passwd *pw)
  32. {
  33. if (!shell || !shell[0])
  34. shell = DEFAULT_SHELL;
  35. /* Change the current working directory to be the home directory
  36. * of the user */
  37. if (!(flags & SETUP_ENV_NO_CHDIR)) {
  38. if (chdir(pw->pw_dir) != 0) {
  39. bb_error_msg("can't change directory to '%s'", pw->pw_dir);
  40. xchdir((flags & SETUP_ENV_TO_TMP) ? "/tmp" : "/");
  41. }
  42. }
  43. if (flags & SETUP_ENV_CLEARENV) {
  44. const char *term;
  45. /* Leave TERM unchanged. Set HOME, SHELL, USER, LOGNAME, PATH.
  46. * Unset all other environment variables. */
  47. term = getenv("TERM");
  48. clearenv();
  49. if (term)
  50. xsetenv("TERM", term);
  51. xsetenv("PATH", (pw->pw_uid ? bb_default_path : bb_default_root_path));
  52. goto shortcut;
  53. // No, gcc (4.2.1) is not clever enougn to do it itself.
  54. //xsetenv("USER", pw->pw_name);
  55. //xsetenv("LOGNAME", pw->pw_name);
  56. //xsetenv("HOME", pw->pw_dir);
  57. //xsetenv("SHELL", shell);
  58. } else if (flags & SETUP_ENV_CHANGEENV) {
  59. /* Set HOME, SHELL, and if not becoming a super-user,
  60. * USER and LOGNAME. */
  61. if (pw->pw_uid) {
  62. shortcut:
  63. xsetenv("USER", pw->pw_name);
  64. xsetenv("LOGNAME", pw->pw_name);
  65. }
  66. xsetenv("HOME", pw->pw_dir);
  67. xsetenv("SHELL", shell);
  68. }
  69. }