git.marmaro.de Git - mmh/blob - sbr/makedir.c

   1 /*
   2 ** makedir.c -- make a directory
   3 **
   4 ** This code is Copyright (c) 2002, by the authors of nmh.  See the
   5 ** COPYRIGHT file in the root directory of the nmh distribution for
   6 ** complete copyright information.
   7 */
   8
   9 /*
  10 ** Modified to try recursive create.
  11 */
  12
  13 #include <h/mh.h>
  14 #include <errno.h>
  15 #include <sys/param.h>
  16 #include <sys/file.h>
  17
  18 int
  19 makedir(char *dir)
  20 {
  21         char path[PATH_MAX];
  22         char* folder_perms_ASCII;
  23         int had_an_error = 0;
  24         mode_t folder_perms, saved_umask;
  25         pid_t pid;
  26         register char* c;
  27
  28         context_save();  /* save the context file */
  29         fflush(stdout);
  30
  31         if (!(folder_perms_ASCII = context_find("folder-protect")))
  32                 folder_perms_ASCII = foldprot;  /* defaults to "700" */
  33
  34         /*
  35         ** Because mh-profile.man documents "Folder-Protect:" as an octal
  36         ** constant, and we don't want to force the user to remember to
  37         ** include a leading zero, we call atooi(folder_perms_ASCII) here
  38         ** rather than strtoul(folder_perms_ASCII, NULL, 0).  Therefore,
  39         ** if anyone ever tries to specify a mode in say, hex, they'll
  40         ** get garbage.  (I guess nmh uses its atooi() function rather
  41         ** than calling strtoul() with a radix of 8 because some ancient
  42         ** platforms are missing that functionality.
  43         */
  44         folder_perms = atooi(folder_perms_ASCII);
  45
  46         /*
  47         ** Folders have definite desired permissions that are set -- we
  48         ** don't want to interact with the umask.  Clear it temporarily.
  49         */
  50         saved_umask = umask(0);
  51
  52         if (getuid() == geteuid()) {
  53                 c = strncpy(path, dir, sizeof(path));
  54
  55                 while (!had_an_error && (c = strchr((c + 1), '/')) != NULL) {
  56                         *c = (char)0;
  57                         if (access(path, X_OK)) {
  58                                 if (errno != ENOENT){
  59                                         advise(dir, "unable to create directory");
  60                                         had_an_error = 1;
  61                                 }
  62                                 /* Create an outer directory. */
  63                                 if (mkdir(path, folder_perms)) {
  64                                         advise(dir, "unable to create directory");
  65                                         had_an_error = 1;
  66                                 }
  67                         }
  68                         *c = '/';
  69                 }
  70
  71                 /*
  72                 ** Create the innermost nested subdirectory of the
  73                 ** path we're being asked to create.
  74                 */
  75                 if (!had_an_error && mkdir(dir, folder_perms)==-1) {
  76                         advise(dir, "unable to create directory");
  77                         had_an_error = 1;
  78                 }
  79         } else {
  80                 /*
  81                 ** Ummm, why do we want to avoid creating directories
  82                 ** with the effective user ID?  None of the nmh tools are
  83                 ** installed such that the effective should be different
  84                 ** from the real, and if some parent process made the two
  85                 ** be different, I don't see why it should be our job to
  86                 ** enforce the real UID.  Also, why the heck do we call
  87                 ** the mkdir executable rather than the library function in
  88                 ** this case??  If we do want to call the mkdir executable,
  89                 ** we should at least be giving it -p (and change the single
  90                 ** chmod() call below) so it can successfully create nested
  91                 ** directories like the above code can.
  92                 ** -- Dan Harkless <dan-nmh@dilvish.speed.net>
  93                 */
  94                 switch (pid = fork()) {
  95                 case -1:
  96                         advise("fork", "unable to");
  97                         return 0;
  98
  99                 case 0:
 100                         setgid(getgid());
 101                         setuid(getuid());
 102
 103                         execl("/bin/mkdir", "mkdir", dir, NULL);
 104                         execl("/usr/bin/mkdir", "mkdir", dir, NULL);
 105                         fprintf(stderr, "unable to exec ");
 106                         perror("mkdir");
 107                         _exit(-1);
 108
 109                 default:
 110                         if (pidXwait(pid, "mkdir"))
 111                                 return 0;
 112                         break;
 113                 }
 114
 115                 chmod(dir, folder_perms);
 116         }
 117
 118         umask(saved_umask);  /* put the user's umask back */
 119
 120         return (had_an_error) ? 0 : 1;
 121 }