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-rw-r--r--ftpfs/netfs.c441
1 files changed, 441 insertions, 0 deletions
diff --git a/ftpfs/netfs.c b/ftpfs/netfs.c
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--- /dev/null
+++ b/ftpfs/netfs.c
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+/* ftpfs interface to libnetfs
+
+ Copyright (C) 1997 Free Software Foundation, Inc.
+ Written by Miles Bader <miles@gnu.ai.mit.edu>
+ 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 <stddef.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include <hurd/netfs.h>
+
+#include "ftpfs.h"
+#include "ccache.h"
+
+/* Attempt to create a file named NAME in DIR for USER with MODE. Set *NODE
+ to the new node upon return. On any error, clear *NODE. *NODE should be
+ locked on success; no matter what, unlock DIR before returning. */
+error_t
+netfs_attempt_create_file (struct iouser *user, struct node *dir,
+ char *name, mode_t mode, struct node **node)
+{
+ *node = 0;
+ mutex_unlock (&dir->lock);
+ return EOPNOTSUPP;
+}
+
+/* Node NODE is being opened by USER, with FLAGS. NEWNODE is nonzero if we
+ just created this node. Return an error if we should not permit the open
+ to complete because of a permission restriction. */
+error_t
+netfs_check_open_permissions (struct iouser *user, struct node *node,
+ int flags, int newnode)
+{
+ error_t err = ftpfs_refresh_node (node);
+ if (!err && (flags & O_READ))
+ err = fshelp_access (&node->nn_stat, S_IREAD, user);
+ if (!err && (flags & O_WRITE))
+ err = fshelp_access (&node->nn_stat, S_IWRITE, user);
+ if (!err && (flags & O_EXEC))
+ err = fshelp_access (&node->nn_stat, S_IEXEC, user);
+ return err;
+}
+
+/* This should attempt a utimes call for the user specified by CRED on node
+ NODE, to change the atime to ATIME and the mtime to MTIME. */
+error_t
+netfs_attempt_utimes (struct iouser *cred, struct node *node,
+ struct timespec *atime, struct timespec *mtime)
+{
+ error_t err = ftpfs_refresh_node (node);
+
+ if (! err)
+ err = fshelp_isowner (&node->nn_stat, cred);
+
+ if (! err)
+ {
+ node->nn_stat.st_mtime = mtime->tv_sec;
+ node->nn_stat.st_mtime_usec = mtime->tv_nsec / 1000;
+ node->nn_stat.st_atime = atime->tv_sec;
+ node->nn_stat.st_atime_usec = atime->tv_nsec / 1000;
+ fshelp_touch (&node->nn_stat, TOUCH_CTIME, ftpfs_maptime);
+ }
+
+ return err;
+}
+
+/* Return the valid access types (bitwise OR of O_READ, O_WRITE, and O_EXEC)
+ in *TYPES for file NODE and user CRED. */
+error_t
+netfs_report_access (struct iouser *cred, struct node *node, int *types)
+{
+ error_t err = ftpfs_refresh_node (node);
+
+ if (! err)
+ {
+ *types = 0;
+ if (fshelp_access (&node->nn_stat, S_IREAD, cred) == 0)
+ *types |= O_READ;
+ if (fshelp_access (&node->nn_stat, S_IWRITE, cred) == 0)
+ *types |= O_WRITE;
+ if (fshelp_access (&node->nn_stat, S_IEXEC, cred) == 0)
+ *types |= O_EXEC;
+ }
+
+ return err;
+}
+
+/* Trivial definitions. */
+
+/* Make sure that NP->nn_stat is filled with current information. CRED
+ identifies the user responsible for the operation. */
+error_t
+netfs_validate_stat (struct node *node, struct iouser *cred)
+{
+ return ftpfs_refresh_node (node);
+}
+
+/* This should sync the file NODE completely to disk, for the user CRED. If
+ WAIT is set, return only after sync is completely finished. */
+error_t
+netfs_attempt_sync (struct iouser *cred, struct node *node, int wait)
+{
+ return 0;
+}
+
+/* The granularity with which we allocate space to return our result. */
+#define DIRENTS_CHUNK_SIZE (8*1024)
+
+/* Returned directory entries are aligned to blocks this many bytes long.
+ Must be a power of two. */
+#define DIRENT_ALIGN 4
+#define DIRENT_NAME_OFFS offsetof (struct dirent, d_name)
+
+/* Length is structure before the name + the name + '\0', all
+ padded to a four-byte alignment. */
+#define DIRENT_LEN(name_len) \
+ ((DIRENT_NAME_OFFS + (name_len) + 1 + (DIRENT_ALIGN - 1)) \
+ & ~(DIRENT_ALIGN - 1))
+
+/* Fetch a directory, as for netfs_get_dirents. */
+static error_t
+get_dirents (struct ftpfs_dir *dir,
+ int first_entry, int max_entries, char **data,
+ mach_msg_type_number_t *data_len,
+ vm_size_t max_data_len, int *data_entries)
+{
+ struct ftpfs_dir_entry *e;
+ error_t err = 0;
+
+ if (! dir)
+ return ENOTDIR;
+
+ e = dir->ordered;
+
+ /* Find the first entry. */
+ while (first_entry-- > 0)
+ if (! e)
+ {
+ max_entries = 0;
+ break;
+ }
+ else
+ e = e->ordered_next;
+
+ if (max_entries != 0)
+ {
+ size_t size =
+ (max_data_len == 0 || max_data_len > DIRENTS_CHUNK_SIZE
+ ? DIRENTS_CHUNK_SIZE
+ : max_data_len);
+
+ err = vm_allocate (mach_task_self (), (vm_address_t *) data, size, 1);
+
+ if (! err)
+ {
+ char *p = *data;
+ int count = 0;
+
+ /* See how much space we need for the result. */
+ while ((max_entries == -1 || count < max_entries) && e)
+ {
+ struct dirent hdr;
+ size_t name_len = strlen (e->name);
+ size_t sz = DIRENT_LEN (name_len);
+ int entry_type =
+ e->stat_timestamp ? IFTODT (e->stat.st_mode) : DT_UNKNOWN;
+
+ if ((p - *data) + sz > size)
+ if (max_data_len > 0)
+ break;
+ else
+ /* Try to grow our return buffer. */
+ {
+ vm_address_t extension = (vm_address_t)(*data + size);
+ err = vm_allocate (mach_task_self (), &extension,
+ DIRENTS_CHUNK_SIZE, 0);
+ if (err)
+ break;
+ size += DIRENTS_CHUNK_SIZE;
+ }
+
+ hdr.d_namlen = name_len;
+ hdr.d_fileno = e->stat.st_ino;
+ hdr.d_reclen = sz;
+ hdr.d_type = entry_type;
+
+ memcpy (p, &hdr, DIRENT_NAME_OFFS);
+ strcpy (p + DIRENT_NAME_OFFS, e->name);
+ p += sz;
+
+ count++;
+ e = e->ordered_next;
+ }
+
+ if (err)
+ vm_deallocate (mach_task_self (), (vm_address_t)*data, size);
+ else
+ {
+ vm_address_t alloc_end = (vm_address_t)(*data + size);
+ vm_address_t real_end = round_page (p);
+ if (alloc_end > real_end)
+ vm_deallocate (mach_task_self (),
+ real_end, alloc_end - real_end);
+ *data_len = p - *data;
+ *data_entries = count;
+ }
+ }
+ }
+ else
+ {
+ *data_len = 0;
+ *data_entries = 0;
+ }
+
+ return err;
+}
+
+error_t
+netfs_get_dirents (struct iouser *cred, struct node *dir,
+ int first_entry, int max_entries, char **data,
+ mach_msg_type_number_t *data_len,
+ vm_size_t max_data_len, int *data_entries)
+{
+ error_t err = ftpfs_refresh_node (dir);
+
+ if (! err)
+ if (dir->nn->dir)
+ {
+ err = ftpfs_dir_refresh (dir->nn->dir);
+ if (! err)
+ err = get_dirents (dir->nn->dir, first_entry, max_entries,
+ data, data_len, max_entries, data_entries);
+ }
+ else
+ err = ENOTDIR;
+
+ return err;
+}
+
+/* Lookup NAME in DIR for USER; set *NODE to the found name upon return. If
+ the name was not found, then return ENOENT. On any error, clear *NODE.
+ (*NODE, if found, should be locked, this call should unlock DIR no matter
+ what.) */
+error_t netfs_attempt_lookup (struct iouser *user, struct node *dir,
+ char *name, struct node **node)
+{
+ error_t err = ftpfs_refresh_node (dir);
+ if (! err)
+ err = ftpfs_dir_lookup (dir->nn->dir, name, node);
+ return err;
+}
+
+/* Delete NAME in DIR for USER. */
+error_t netfs_attempt_unlink (struct iouser *user, struct node *dir,
+ char *name)
+{
+ return EROFS;
+}
+
+/* Note that in this one call, neither of the specific nodes are locked. */
+error_t netfs_attempt_rename (struct iouser *user, struct node *fromdir,
+ char *fromname, struct node *todir,
+ char *toname, int excl)
+{
+ return EROFS;
+}
+
+/* Attempt to create a new directory named NAME in DIR for USER with mode
+ MODE. */
+error_t netfs_attempt_mkdir (struct iouser *user, struct node *dir,
+ char *name, mode_t mode)
+{
+ return EROFS;
+}
+
+/* Attempt to remove directory named NAME in DIR for USER. */
+error_t netfs_attempt_rmdir (struct iouser *user,
+ struct node *dir, char *name)
+{
+ return EROFS;
+}
+
+/* This should attempt a chmod call for the user specified by CRED on node
+ NODE, to change the owner to UID and the group to GID. */
+error_t netfs_attempt_chown (struct iouser *cred, struct node *node,
+ uid_t uid, uid_t gid)
+{
+ return EROFS;
+}
+
+/* This should attempt a chauthor call for the user specified by CRED on node
+ NODE, to change the author to AUTHOR. */
+error_t netfs_attempt_chauthor (struct iouser *cred, struct node *node,
+ uid_t author)
+{
+ return EROFS;
+}
+
+/* This should attempt a chmod call for the user specified by CRED on node
+ NODE, to change the mode to MODE. Unlike the normal Unix and Hurd meaning
+ of chmod, this function is also used to attempt to change files into other
+ types. If such a transition is attempted which is impossible, then return
+ EOPNOTSUPP. */
+error_t netfs_attempt_chmod (struct iouser *cred, struct node *node,
+ mode_t mode)
+{
+ return EROFS;
+}
+
+/* Attempt to turn NODE (user CRED) into a symlink with target NAME. */
+error_t netfs_attempt_mksymlink (struct iouser *cred, struct node *node,
+ char *name)
+{
+ return EROFS;
+}
+
+/* Attempt to turn NODE (user CRED) into a device. TYPE is either S_IFBLK or
+ S_IFCHR. */
+error_t netfs_attempt_mkdev (struct iouser *cred, struct node *node,
+ mode_t type, dev_t indexes)
+{
+ return EROFS;
+}
+
+/* Attempt to set the passive translator record for FILE to ARGZ (of length
+ ARGZLEN) for user CRED. */
+error_t netfs_set_translator (struct iouser *cred, struct node *node,
+ char *argz, size_t argzlen)
+{
+ return EROFS;
+}
+
+/* This should attempt a chflags call for the user specified by CRED on node
+ NODE, to change the flags to FLAGS. */
+error_t netfs_attempt_chflags (struct iouser *cred, struct node *node,
+ int flags)
+{
+ return EROFS;
+}
+
+/* This should attempt to set the size of the file NODE (for user CRED) to
+ SIZE bytes long. */
+error_t netfs_attempt_set_size (struct iouser *cred, struct node *node,
+ off_t size)
+{
+ return EROFS;
+}
+
+/* This should attempt to fetch filesystem status information for the remote
+ filesystem, for the user CRED. */
+error_t netfs_attempt_statfs (struct iouser *cred, struct node *node,
+ struct statfs *st)
+{
+ return EOPNOTSUPP;
+}
+
+/* This should sync the entire remote filesystem. If WAIT is set, return
+ only after sync is completely finished. */
+error_t netfs_attempt_syncfs (struct iouser *cred, int wait)
+{
+ return 0;
+}
+
+/* Create a link in DIR with name NAME to FILE for USER. Note that neither
+ DIR nor FILE are locked. If EXCL is set, do not delete the target, but
+ return EEXIST if NAME is already found in DIR. */
+error_t netfs_attempt_link (struct iouser *user, struct node *dir,
+ struct node *file, char *name, int excl)
+{
+ return EROFS;
+}
+
+/* Attempt to create an anonymous file related to DIR for USER with MODE.
+ Set *NODE to the returned file upon success. No matter what, unlock DIR. */
+error_t netfs_attempt_mkfile (struct iouser *user, struct node *dir,
+ mode_t mode, struct node **node)
+{
+ return EROFS;
+}
+
+/* Read the contents of NODE (a symlink), for USER, into BUF. */
+error_t netfs_attempt_readlink (struct iouser *user, struct node *node, char *buf)
+{
+ error_t err = ftpfs_refresh_node (node);
+ if (! err)
+ {
+ struct ftpfs_dir_entry *e = node->nn->dir_entry;
+ if (e)
+ bcopy (e->symlink_target, buf, node->nn_stat.st_size);
+ else
+ err = EINVAL;
+ }
+ return err;
+}
+
+/* Read from the file NODE for user CRED starting at OFFSET and continuing for
+ up to *LEN bytes. Put the data at DATA. Set *LEN to the amount
+ successfully read upon return. */
+error_t netfs_attempt_read (struct iouser *cred, struct node *node,
+ off_t offset, size_t *len, void *data)
+{
+ error_t err = 0;
+
+ if (! node->nn->contents)
+ err = ccache_create (node, &node->nn->contents);
+ if (! err)
+ {
+ if (*len > node->nn_stat.st_size - offset)
+ *len = node->nn_stat.st_size - offset;
+ if (*len > 0)
+ err = ccache_read (node->nn->contents, offset, *len, data);
+ }
+
+ return err;
+}
+
+/* Write to the file NODE for user CRED starting at OFSET and continuing for up
+ to *LEN bytes from DATA. Set *LEN to the amount seccessfully written upon
+ return. */
+error_t netfs_attempt_write (struct iouser *cred, struct node *node,
+ off_t offset, size_t *len, void *data)
+{
+ return EROFS;
+}
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