diff options
| -rw-r--r-- | libnetfs/file-set-translator.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/libnetfs/file-set-translator.c b/libnetfs/file-set-translator.c new file mode 100644 index 00000000..c617d0d3 --- /dev/null +++ b/libnetfs/file-set-translator.c @@ -0,0 +1,187 @@ +/* + Copyright (C) 1996 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" + +error_t +netfs_S_file_set_translator (struct protid *user, + int pflags, int aflags, + int gflags, char *passive, + mach_msg_type_number_t passivelen, + mach_port_t active) +{ + struct node *np; + error_t err; + uid_t *uids, *gids; + int nuids, ngids; + int i; + mach_port_t control; + + if (!user) + return EOPNOTSUPP; + + if (!(passive_flags & FS_TRANS_SET) && !(active_flags & FS_TRANS_SET)) + return 0; + + if (passive && passive[passivelen - 1]) + return EINVAL; + + np = user->po->np; + mutex_lock (&np->lock); + + if (active_flags & FS_TRANS_SET) + { + /* Validate--user must be owner */ + err = netfs_interpret_credential (user->credential, &uids, &nuids, + &gids, &ngids); + if (err) + goto out; + err = netfs_validate_stat (np, user->credential); + if (err) + goto out; + + for (i = 0; i < nuids; i++) + if (uids[i] == 0 || uids[i] == np->nn_stat.st_uid) + break; + if (i == uids) + { + mutex_unlock (&np->lock); + return EBUSY; + } + + err = fshelp_fetch_control (&np->transbox, &control); + if (err) + goto out; + + if (control != MACH_PORT_NULL + && (active_flags & FS_TRANS_EXCL) == 0) + { + mutex_unlock (&np->lock); + err = fsys_goaway (control, killtrans_flags); + if (err && err != MIG_SERVER_DIED && err != MACH_SEND_INVALID_DEST) + return err; + err = 0; + mutex_lock (&np->lock); + } + } + + if ((passive_flags & FS_TRANS_SET) + && (passive_flags & FS_TRANS_EXCL) + && np->istranslated) + { + mutex_unlock (&np->lock); + return EBUSY; + } + + if (active_flags & FS_TRANS_SET) + { + err = fshelp_set_active (&np->transbox, active, + active_flags & FS_TRANS_EXCL); + if (err) + goto out; + } + + if (passive_flags & FS_TRANS_SET) + { + mode_t newmode = 0; + if (!(passive_flags & FS_TRANS_FORCE)) + { + /* Short circuited translators */ + + if (netfs_shortcut_symlink && !strcmp (passive, _HURD_SYMLINK)) + newmode = S_IFLNK; + else if (netfs_shortcut_chrdev && !(strcmp (passive, _HURD_CHRDEV))) + newmode = S_IFCHR; + else if (netfs_shortcut_blkdev && !strcmp (passive, _HURD_BLKDEV)) + newmode = S_IFBLK; + else if (netfs_shortcut_fifo && !strcmp (passive, _HURD_FIFO)) + newmode = S_IFIFO; + else if (netfs_shortcut_ifsock && !strcmp (passive, _HURD_IFSOCK)) + newmode = S_IFSOCK; + } + + switch (newmode) + { + int major, minor; + char *arg; + + case S_IFBLK: + case S_IFCHR: + /* Find the device number from the arguments + of the translator. */ + arg = passive + strlen (passive) + 1; + assert (arg <= passive + passivelen); + if (arg == passive + passivelen) + { + mutex_unlock (&np->lock); + return EINVAL; + } + major = strtol (arg, 0, 0); + + arg = arg + strlen (arg) + 1; + assert (arg < passive + passivelen); + if (arg == passive + passivelen) + { + mutex_unlock (&np->lock); + return EINVAL; + } + minor = strtol (arg, 0, 0); + + err = netfs_attempt_mkdev (user->credential, np, + newmode, major, minor); + if (err == EOPNOTSUPP) + goto fallback; + break; + + case S_IFLNK: + arg = passive + strlen (passive) + 1; + assert (arg <= passive + passivelen); + if (arg == passive + passivelen) + { + mutex_unlock (&np->lock); + return EINVAL; + } + + err = netfs_attempt_mksymlink (user->credential, np, arg); + if (err == EOPNOTSUPP) + goto fallback; + break; + + default: + err = netfs_validate_stat (np, user->credential); + if (!err) + err = netfs_attempt_chmod (user->credential, np, + ((np->nn_stat.st_mode & ~S_IFMT) + | newmode)); + if (err == EOPNOTSUPP) + goto fallback; + break; + + case 0: + fallback: + error = netfs_set_translator (np, passive, passivelen, cred); + break; + } + } + + out: + mutex_unlock (&np->lock); + return err; +} |