diplodocus.org Git - nmh/blob - sbr/makedir.c

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