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[exim.git] / src / src / directory.c

diff --git a/src/src/directory.c b/src/src/directory.c
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+/* $Cambridge: exim/src/src/directory.c,v 1.1 2004/10/07 10:39:01 ph10 Exp $ */
+
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+#include "exim.h"
+
+
+/*************************************************
+*           Attempt to create a directory        *
+*************************************************/
+
+/* All the directories that Exim ever creates for itself are within the spool
+directory as defined by spool_directory. We are prepared to create as many as
+necessary from that directory downwards, inclusive. However, directory creation
+can also be required in appendfile and sieve filters. The making function
+therefore has a parent argument, below which the new directories are to go. It
+can be NULL if the name is absolute.
+
+If a non-root uid has been specified for exim, and we are currently running as
+root, ensure the directory is owned by the non-root id if the parent is the
+spool directory.
+
+Arguments:
+  parent    parent directory name; if NULL the name must be absolute
+  name      directory name within the parent that we want
+  mode      mode for the new directory
+  panic     if TRUE, panic on failure
+
+Returns:    panic on failure if panic is set; otherwise return FALSE;
+            TRUE on success.
+*/
+
+BOOL
+directory_make(uschar *parent, uschar *name, int mode, BOOL panic)
+{
+BOOL use_chown = parent == spool_directory && geteuid() == root_uid;
+uschar *p, *slash;
+int c = 1;
+struct stat statbuf;
+uschar buffer[256];
+
+if (parent == NULL)
+  {
+  p = buffer + 1;
+  slash = parent = US"";
+  }
+else
+  {
+  p = buffer + Ustrlen(parent);
+  slash = US"/";
+  }
+
+if (!string_format(buffer, sizeof(buffer), "%s%s%s", parent, slash, name))
+  log_write(0, LOG_MAIN|LOG_PANIC_DIE, "name too long in directory_make");
+
+while (c != 0 && *p != 0)
+  {
+  while (*p != 0 && *p != '/') p++;
+  c = *p;
+  *p = 0;
+  if (Ustat(buffer, &statbuf) != 0)
+    {
+    if (mkdir(CS buffer, mode) < 0 && errno != EEXIST)
+      {
+      if (!panic) return FALSE;
+      log_write(0, LOG_MAIN|LOG_PANIC_DIE,
+        "Failed to create directory \"%s\": %s\n", buffer, strerror(errno));
+      }
+
+    /* Set the ownership if necessary. */
+
+    if (use_chown) Uchown(buffer, exim_uid, exim_gid);
+
+    /* It appears that any mode bits greater than 0777 are ignored by
+    mkdir(), at least on some operating systems. Therefore, if the mode
+    contains any such bits, do an explicit mode setting. */
+
+    if ((mode & 0777000) != 0) Uchmod(buffer, mode);
+    }
+  *p++ = c;
+  }
+
+return TRUE;
+}
+
+/* End of directory.c */