Formerly fsys-getroot.c.~2~

1 files changed, 69 insertions, 3 deletions

diff --git a/libnetfs/fsys-getroot.c b/libnetfs/fsys-getroot.c
index d70a42e5..ef870857 100644
--- a/libnetfs/fsys-getroot.c
+++ b/libnetfs/fsys-getroot.c
@@ -20,6 +20,8 @@
 
 #include "netfs.h"
 #include "fsys_S.h"
+#include "misc.h"
+#include <fcntl.h>
 
 error_t
 netfs_S_fsys_getroot (mach_port_t cntl,
@@ -35,14 +37,78 @@ netfs_S_fsys_getroot (mach_port_t cntl,
   struct port_info *pt = ports_lookup_port (netfs_port_bucket, cntl,
 					    netfs_control_class);
   struct netcred *cred;
-  
+  error_t err;
+  struct protid *newpi;
+  mode_t type;
+
   if (!pt)
     return EOPNOTSUPP;
+  ports_port_deref (pt);
 
   cred = netfs_make_credential (uids, nuids, gids, ngids);
   
   flags &= O_HURD;
   
   mutex_lock (&netfs_root_node->lock);
-  netfs_validate_stat (netfs_root_node);
-  type = 
+  err = netfs_validate_stat (netfs_root_node, cred);
+  if (err)
+    goto out;
+  
+  type = netfs_root_node->nn_stat.st_mode & S_IFMT;
+  
+  if (type == S_IFLNK && !(flags & (O_NOLINK | O_NOTRANS)))
+    {
+      char pathbuf[netfs_root_node->nn_stat.st_size + 1];
+      
+      err = netfs_attempt_readlink (cred, netfs_root_node, pathbuf);
+
+      mutex_unlock (&netfs_root_node->lock);
+      if (err)
+	goto out;
+      
+      if (pathbuf[0] == '/')
+	{
+	  *do_retry = FS_RETRY_MAGICAL;
+	  *retry_port = MACH_PORT_NULL;
+	  *retry_port_type = MACH_MSG_TYPE_COPY_SEND;
+	  strcpy (retry_name, pathbuf);
+	  mach_port_deallocate (mach_task_self (), dotdot);
+	  return 0;
+	}
+      else
+	{
+	  *do_retry = FS_RETRY_REAUTH;
+	  *retry_port = dotdot;
+	  *retry_port_type = MACH_MSG_TYPE_MOVE_SEND;
+	  strcpy (retry_name, pathbuf);
+	  return 0;
+	}
+    }
+  
+  if ((type == S_IFSOCK || type == S_IFBLK || type == S_IFCHR 
+      || type == S_IFIFO) && (flags & (O_READ|O_WRITE|O_EXEC)))
+    return EOPNOTSUPP;
+  
+  err = netfs_check_open_permissions (cred, netfs_root_node, flags, 0);
+  if (err)
+    goto out;
+  
+  flags &= ~OPENONLY_STATE_MODES;
+  
+  newpi = netfs_make_protid (netfs_make_peropen (netfs_root_node, flags,
+						 dotdot),
+			     cred);
+  mach_port_deallocate (mach_task_self (), dotdot);
+  *do_retry = FS_RETRY_NORMAL;
+  *retry_port = ports_get_right (newpi);
+  *retry_port_type = MACH_MSG_TYPE_MAKE_SEND;
+  retry_name[0] = '\0';
+  ports_port_deref (newpi);
+  
+ out:
+  mutex_unlock (&netfs_root_node->lock);
+  return err;
+}
+
+  
+