[Dovecot] symbolic links to root node

[Adam Tilghman]

> In some cases users have a symbolic link like "z: -> /" in their
> mail directory. As a result there are log entries like
> 
> stat(/home/xyz/.wine/dosdevices/c:/windows/profiles/xyz/.../z:/proc/28381/root/proc/28381/.../root/proc/28381/Player/#SharedObje
> Jan 25 13:30:31 imap1 dovecot: [ID 107833 mail.error] IMAP(xyz): x) failed: 
> File name too long

Like you, our users store mail in their home directories*
and sometimes they make symlinks to strange places like -> /usr.

I patched dovecot to simply ignore symlinks; maybe you can, too.

diff -c -r dovecot-1.0.0-pristine/src/lib-storage/index/mbox/mbox-list.c dovecot-1.0.0/src/lib-storage/index/mbox/mbox-list.c
*** dovecot-1.0.0-pristine/src/lib-storage/index/mbox/mbox-list.c       Mon Feb  5 05:57:32 2007
--- dovecot-1.0.0/src/lib-storage/index/mbox/mbox-list.c        Thu Apr 26 09:56:22 2007
***************
*** 69,74 ****
--- 69,85 ----
  static int list_opendir(struct mail_storage *storage,
                        const char *path, bool root, DIR **dirp)
  {
+ /* ACS local modification */
+       struct stat st;
+       if (lstat(*path == '\0' ? "/" : path, &st) < 0) {
+               mail_storage_set_error(storage, "lstat failed!");
+               return -1;
+       }
+       if (st.st_mode & S_IFLNK) {
+               return 0; /*ignore*/
+       }
+ /* end ACS local modification */
+ 
        *dirp = opendir(*path == '\0' ? "/" : path);
        if (*dirp != NULL)
                return 1;

-- Adam

* although we're finally starting to convert our 30k users
  over to dedicated maildirs+NFS.  I'll share my experiences 
  with the list once we're done (early March I hope).

-- 
Adam Tilghman  |  Systems Support / Academic Computing  |     +1 858 822 0711
 agt at ucsd.edu  |  University of California, San Diego   | fax +1 858 534 7018