diff options
Diffstat (limited to 'libnetfs/fsys-getroot.c')
| -rw-r--r-- | libnetfs/fsys-getroot.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/libnetfs/fsys-getroot.c b/libnetfs/fsys-getroot.c new file mode 100644 index 00000000..1ee12f41 --- /dev/null +++ b/libnetfs/fsys-getroot.c @@ -0,0 +1,151 @@ +/* + Copyright (C) 1996, 1997 Free Software Foundation, Inc. + Written by Michael I. Bushnell, p/BSG. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ + +#include "netfs.h" +#include "fsys_S.h" +#include "misc.h" +#include "callbacks.h" +#include <fcntl.h> + +error_t +netfs_S_fsys_getroot (mach_port_t cntl, + mach_port_t dotdot, + uid_t *uids, mach_msg_type_number_t nuids, + uid_t *gids, mach_msg_type_number_t ngids, + int flags, + retry_type *do_retry, + char *retry_name, + mach_port_t *retry_port, + mach_port_t *retry_port_type) +{ + struct port_info *pt = ports_lookup_port (netfs_port_bucket, cntl, + netfs_control_class); + struct iouser *cred; + error_t err; + struct protid *newpi; + mode_t type; + struct idvec *uvec, *gvec; + struct peropen peropen_context = { root_parent: dotdot }; + + if (!pt) + return EOPNOTSUPP; + ports_port_deref (pt); + + uvec = make_idvec (); + gvec = make_idvec (); + idvec_set_ids (uvec, uids, nuids); + idvec_set_ids (gvec, gids, ngids); + + cred = iohelp_create_iouser (uvec, gvec); + + flags &= O_HURD; + + mutex_lock (&netfs_root_node->lock); + err = netfs_validate_stat (netfs_root_node, cred); + if (err) + goto out; + + type = netfs_root_node->nn_stat.st_mode & S_IFMT; + + if (((netfs_root_node->nn_stat.st_mode & S_IPTRANS) + || fshelp_translated (&netfs_root_node->transbox)) + && !(flags & O_NOTRANS)) + { + err = fshelp_fetch_root (&netfs_root_node->transbox, + &peropen_context, dotdot, cred, flags, + _netfs_translator_callback1, + _netfs_translator_callback2, + do_retry, retry_name, retry_port); + if (err != ENOENT) + { + mutex_unlock (&netfs_root_node->lock); + iohelp_free_iouser (cred); + if (!err) + *retry_port_type = MACH_MSG_TYPE_MOVE_SEND; + return err; + } + /* ENOENT means translator has vanished inside fshelp_fetch_root. */ + err = 0; + } + + 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); + + if (err) + goto out; + + mutex_unlock (&netfs_root_node->lock); + iohelp_free_iouser (cred); + + 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))) + { + err = EOPNOTSUPP; + goto out; + } + + 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, + &peropen_context), + 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: + if (err) + iohelp_free_iouser (cred); + mutex_unlock (&netfs_root_node->lock); + return err; +} + + + |