src/src/directory.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2009 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 #include "exim.h"
   9
  10
  11 /*************************************************
  12 *           Attempt to create a directory        *
  13 *************************************************/
  14
  15 /* All the directories that Exim ever creates for itself are within the spool
  16 directory as defined by spool_directory. We are prepared to create as many as
  17 necessary from that directory downwards, inclusive. However, directory creation
  18 can also be required in appendfile and sieve filters. The making function
  19 therefore has a parent argument, below which the new directories are to go. It
  20 can be NULL if the name is absolute.
  21
  22 If a non-root uid has been specified for exim, and we are currently running as
  23 root, ensure the directory is owned by the non-root id if the parent is the
  24 spool directory.
  25
  26 Arguments:
  27   parent    parent directory name; if NULL the name must be absolute
  28   name      directory name within the parent that we want
  29   mode      mode for the new directory
  30   panic     if TRUE, panic on failure
  31
  32 Returns:    panic on failure if panic is set; otherwise return FALSE;
  33             TRUE on success.
  34 */
  35
  36 BOOL
  37 directory_make(const uschar *parent, const uschar *name,
  38                int mode, BOOL panic)
  39 {
  40 BOOL use_chown = parent == spool_directory && geteuid() == root_uid;
  41 uschar *p;
  42 const uschar *slash;
  43 int c = 1;
  44 struct stat statbuf;
  45 uschar buffer[256];
  46
  47 if (parent == NULL)
  48   {
  49   p = buffer + 1;
  50   slash = parent = CUS"";
  51   }
  52 else
  53   {
  54   p = buffer + Ustrlen(parent);
  55   slash = US"/";
  56   }
  57
  58 if (!string_format(buffer, sizeof(buffer), "%s%s%s", parent, slash, name))
  59   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "name too long in directory_make");
  60
  61 while (c != 0 && *p != 0)
  62   {
  63   while (*p != 0 && *p != '/') p++;
  64   c = *p;
  65   *p = 0;
  66   if (Ustat(buffer, &statbuf) != 0)
  67     {
  68     if (mkdir(CS buffer, mode) < 0 && errno != EEXIST)
  69       {
  70       if (!panic) return FALSE;
  71       log_write(0, LOG_MAIN|LOG_PANIC_DIE,
  72         "Failed to create directory \"%s\": %s\n", buffer, strerror(errno));
  73       }
  74
  75     /* Set the ownership if necessary. */
  76
  77     if (use_chown && Uchown(buffer, exim_uid, exim_gid))
  78       {
  79       if (!panic) return FALSE;
  80       log_write(0, LOG_MAIN|LOG_PANIC_DIE,
  81         "Failed to set owner on directory \"%s\": %s\n", buffer, strerror(errno));
  82       }
  83
  84     /* It appears that any mode bits greater than 0777 are ignored by
  85     mkdir(), at least on some operating systems. Therefore, if the mode
  86     contains any such bits, do an explicit mode setting. */
  87
  88     if ((mode & 0777000) != 0) (void)Uchmod(buffer, mode);
  89     }
  90   *p++ = c;
  91   }
  92
  93 return TRUE;
  94 }
  95
  96 /* End of directory.c */