--- /dev/null
+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ VFS initialisation and support functions
+ Copyright (C) Tim Potter 1999
+ Copyright (C) Alexander Bokovoy 2002
+
+ This program 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 of the License, or
+ (at your option) any later version.
+
+ This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ This work was sponsored by Optifacio Software Services, Inc.
+*/
+
+#include "includes.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+struct vfs_init_function_entry {
+ char *name;
+ vfs_op_tuple *vfs_op_tuples;
+ struct vfs_init_function_entry *prev, *next;
+};
+
+static struct vfs_init_function_entry *backends = NULL;
+
+/* Some structures to help us initialise the vfs operations table */
+
+struct vfs_syminfo {
+ char *name;
+ void *fptr;
+};
+
+/* Default vfs hooks. WARNING: The order of these initialisers is
+ very important. They must be in the same order as defined in
+ vfs.h. Change at your own peril. */
+
+static struct vfs_ops default_vfs = {
+
+ {
+ /* Disk operations */
+
+ vfswrap_dummy_connect,
+ vfswrap_dummy_disconnect,
+ vfswrap_disk_free,
+ vfswrap_get_quota,
+ vfswrap_set_quota,
+ vfswrap_get_shadow_copy_data,
+ vfswrap_statvfs,
+
+ /* Directory operations */
+
+ vfswrap_opendir,
+ vfswrap_readdir,
+ vfswrap_seekdir,
+ vfswrap_telldir,
+ vfswrap_rewinddir,
+ vfswrap_mkdir,
+ vfswrap_rmdir,
+ vfswrap_closedir,
+
+ /* File operations */
+
+ vfswrap_open,
+ vfswrap_close,
+ vfswrap_read,
+ vfswrap_pread,
+ vfswrap_write,
+ vfswrap_pwrite,
+ vfswrap_lseek,
+ vfswrap_sendfile,
+ vfswrap_rename,
+ vfswrap_fsync,
+ vfswrap_stat,
+ vfswrap_fstat,
+ vfswrap_lstat,
+ vfswrap_unlink,
+ vfswrap_chmod,
+ vfswrap_fchmod,
+ vfswrap_chown,
+ vfswrap_fchown,
+ vfswrap_chdir,
+ vfswrap_getwd,
+ vfswrap_utime,
+ vfswrap_ftruncate,
+ vfswrap_lock,
+ vfswrap_symlink,
+ vfswrap_readlink,
+ vfswrap_link,
+ vfswrap_mknod,
+ vfswrap_realpath,
+
+ /* Windows ACL operations. */
+ vfswrap_fget_nt_acl,
+ vfswrap_get_nt_acl,
+ vfswrap_fset_nt_acl,
+ vfswrap_set_nt_acl,
+
+ /* POSIX ACL operations. */
+ vfswrap_chmod_acl,
+ vfswrap_fchmod_acl,
+
+ vfswrap_sys_acl_get_entry,
+ vfswrap_sys_acl_get_tag_type,
+ vfswrap_sys_acl_get_permset,
+ vfswrap_sys_acl_get_qualifier,
+ vfswrap_sys_acl_get_file,
+ vfswrap_sys_acl_get_fd,
+ vfswrap_sys_acl_clear_perms,
+ vfswrap_sys_acl_add_perm,
+ vfswrap_sys_acl_to_text,
+ vfswrap_sys_acl_init,
+ vfswrap_sys_acl_create_entry,
+ vfswrap_sys_acl_set_tag_type,
+ vfswrap_sys_acl_set_qualifier,
+ vfswrap_sys_acl_set_permset,
+ vfswrap_sys_acl_valid,
+ vfswrap_sys_acl_set_file,
+ vfswrap_sys_acl_set_fd,
+ vfswrap_sys_acl_delete_def_file,
+ vfswrap_sys_acl_get_perm,
+ vfswrap_sys_acl_free_text,
+ vfswrap_sys_acl_free_acl,
+ vfswrap_sys_acl_free_qualifier,
+
+ /* EA operations. */
+ vfswrap_getxattr,
+ vfswrap_lgetxattr,
+ vfswrap_fgetxattr,
+ vfswrap_listxattr,
+ vfswrap_llistxattr,
+ vfswrap_flistxattr,
+ vfswrap_removexattr,
+ vfswrap_lremovexattr,
+ vfswrap_fremovexattr,
+ vfswrap_setxattr,
+ vfswrap_lsetxattr,
+ vfswrap_fsetxattr,
+
+ /* AIO operations. */
+ vfswrap_aio_read,
+ vfswrap_aio_write,
+ vfswrap_aio_return,
+ vfswrap_aio_cancel,
+ vfswrap_aio_error,
+ vfswrap_aio_fsync,
+ vfswrap_aio_suspend
+ }
+};
+
+/****************************************************************************
+ maintain the list of available backends
+****************************************************************************/
+
+static struct vfs_init_function_entry *vfs_find_backend_entry(const char *name)
+{
+ struct vfs_init_function_entry *entry = backends;
+
+ while(entry) {
+ if (strcmp(entry->name, name)==0) return entry;
+ entry = entry->next;
+ }
+
+ return NULL;
+}
+
+NTSTATUS smb_register_vfs(int version, const char *name, vfs_op_tuple *vfs_op_tuples)
+{
+ struct vfs_init_function_entry *entry = backends;
+
+ if ((version != SMB_VFS_INTERFACE_VERSION)) {
+ DEBUG(0, ("Failed to register vfs module.\n"
+ "The module was compiled against SMB_VFS_INTERFACE_VERSION %d,\n"
+ "current SMB_VFS_INTERFACE_VERSION is %d.\n"
+ "Please recompile against the current Samba Version!\n",
+ version, SMB_VFS_INTERFACE_VERSION));
+ return NT_STATUS_OBJECT_TYPE_MISMATCH;
+ }
+
+ if (!name || !name[0] || !vfs_op_tuples) {
+ DEBUG(0,("smb_register_vfs() called with NULL pointer or empty name!\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ if (vfs_find_backend_entry(name)) {
+ DEBUG(0,("VFS module %s already loaded!\n", name));
+ return NT_STATUS_OBJECT_NAME_COLLISION;
+ }
+
+ entry = SMB_XMALLOC_P(struct vfs_init_function_entry);
+ entry->name = smb_xstrdup(name);
+ entry->vfs_op_tuples = vfs_op_tuples;
+
+ DLIST_ADD(backends, entry);
+ DEBUG(5, ("Successfully added vfs backend '%s'\n", name));
+ return NT_STATUS_OK;
+}
+
+/****************************************************************************
+ initialise default vfs hooks
+****************************************************************************/
+
+static void vfs_init_default(connection_struct *conn)
+{
+ DEBUG(3, ("Initialising default vfs hooks\n"));
+
+ memcpy(&conn->vfs.ops, &default_vfs.ops, sizeof(default_vfs.ops));
+ memcpy(&conn->vfs_opaque.ops, &default_vfs.ops, sizeof(default_vfs.ops));
+}
+
+/****************************************************************************
+ initialise custom vfs hooks
+ ****************************************************************************/
+
+BOOL vfs_init_custom(connection_struct *conn, const char *vfs_object)
+{
+ vfs_op_tuple *ops;
+ char *module_name = NULL;
+ char *module_param = NULL, *p;
+ int i;
+ vfs_handle_struct *handle;
+ struct vfs_init_function_entry *entry;
+
+ if (!conn||!vfs_object||!vfs_object[0]) {
+ DEBUG(0,("vfs_init_custon() called with NULL pointer or emtpy vfs_object!\n"));
+ return False;
+ }
+
+ if(!backends) {
+ static_init_vfs;
+ }
+
+ DEBUG(3, ("Initialising custom vfs hooks from [%s]\n", vfs_object));
+
+ module_name = smb_xstrdup(vfs_object);
+
+ p = strchr_m(module_name, ':');
+
+ if (p) {
+ *p = 0;
+ module_param = p+1;
+ trim_char(module_param, ' ', ' ');
+ }
+
+ trim_char(module_name, ' ', ' ');
+
+ /* First, try to load the module with the new module system */
+ if((entry = vfs_find_backend_entry(module_name)) ||
+ (NT_STATUS_IS_OK(smb_probe_module("vfs", module_name)) &&
+ (entry = vfs_find_backend_entry(module_name)))) {
+
+ DEBUGADD(5,("Successfully loaded vfs module [%s] with the new modules system\n", vfs_object));
+
+ if ((ops = entry->vfs_op_tuples) == NULL) {
+ DEBUG(0, ("entry->vfs_op_tuples==NULL for [%s] failed\n", vfs_object));
+ SAFE_FREE(module_name);
+ return False;
+ }
+ } else {
+ DEBUG(0,("Can't find a vfs module [%s]\n",vfs_object));
+ SAFE_FREE(module_name);
+ return False;
+ }
+
+ handle = TALLOC_ZERO_P(conn->mem_ctx,vfs_handle_struct);
+ if (!handle) {
+ DEBUG(0,("talloc_zero() failed!\n"));
+ SAFE_FREE(module_name);
+ return False;
+ }
+ memcpy(&handle->vfs_next, &conn->vfs, sizeof(struct vfs_ops));
+ handle->conn = conn;
+ if (module_param) {
+ handle->param = talloc_strdup(conn->mem_ctx, module_param);
+ }
+ DLIST_ADD(conn->vfs_handles, handle);
+
+ for(i=0; ops[i].op != NULL; i++) {
+ DEBUG(5, ("Checking operation #%d (type %d, layer %d)\n", i, ops[i].type, ops[i].layer));
+ if(ops[i].layer == SMB_VFS_LAYER_OPAQUE) {
+ /* Check whether this operation was already made opaque by different module */
+ if(((void**)&conn->vfs_opaque.ops)[ops[i].type] == ((void**)&default_vfs.ops)[ops[i].type]) {
+ /* No, it isn't overloaded yet. Overload. */
+ DEBUGADD(5, ("Making operation type %d opaque [module %s]\n", ops[i].type, vfs_object));
+ ((void**)&conn->vfs_opaque.ops)[ops[i].type] = ops[i].op;
+ ((vfs_handle_struct **)&conn->vfs_opaque.handles)[ops[i].type] = handle;
+ }
+ }
+ /* Change current VFS disposition*/
+ DEBUGADD(5, ("Accepting operation type %d from module %s\n", ops[i].type, vfs_object));
+ ((void**)&conn->vfs.ops)[ops[i].type] = ops[i].op;
+ ((vfs_handle_struct **)&conn->vfs.handles)[ops[i].type] = handle;
+ }
+
+ SAFE_FREE(module_name);
+ return True;
+}
+
+/*****************************************************************
+ Generic VFS init.
+******************************************************************/
+
+BOOL smbd_vfs_init(connection_struct *conn)
+{
+ const char **vfs_objects;
+ unsigned int i = 0;
+ int j = 0;
+
+ /* Normal share - initialise with disk access functions */
+ vfs_init_default(conn);
+ vfs_objects = lp_vfs_objects(SNUM(conn));
+
+ /* Override VFS functions if 'vfs object' was not specified*/
+ if (!vfs_objects || !vfs_objects[0])
+ return True;
+
+ for (i=0; vfs_objects[i] ;) {
+ i++;
+ }
+
+ for (j=i-1; j >= 0; j--) {
+ if (!vfs_init_custom(conn, vfs_objects[j])) {
+ DEBUG(0, ("smbd_vfs_init: vfs_init_custom failed for %s\n", vfs_objects[j]));
+ return False;
+ }
+ }
+ return True;
+}
+
+/*******************************************************************
+ Check if directory exists.
+********************************************************************/
+
+BOOL vfs_directory_exist(connection_struct *conn, const char *dname, SMB_STRUCT_STAT *st)
+{
+ SMB_STRUCT_STAT st2;
+ BOOL ret;
+
+ if (!st)
+ st = &st2;
+
+ if (SMB_VFS_STAT(conn,dname,st) != 0)
+ return(False);
+
+ ret = S_ISDIR(st->st_mode);
+ if(!ret)
+ errno = ENOTDIR;
+
+ return ret;
+}
+
+/*******************************************************************
+ vfs mkdir wrapper
+********************************************************************/
+
+int vfs_MkDir(connection_struct *conn, const char *name, mode_t mode)
+{
+ int ret;
+ SMB_STRUCT_STAT sbuf;
+
+ if(!(ret=SMB_VFS_MKDIR(conn, name, mode))) {
+
+ inherit_access_acl(conn, name, mode);
+
+ /*
+ * Check if high bits should have been set,
+ * then (if bits are missing): add them.
+ * Consider bits automagically set by UNIX, i.e. SGID bit from parent dir.
+ */
+ if(mode & ~(S_IRWXU|S_IRWXG|S_IRWXO) &&
+ !SMB_VFS_STAT(conn,name,&sbuf) && (mode & ~sbuf.st_mode))
+ SMB_VFS_CHMOD(conn,name,sbuf.st_mode | (mode & ~sbuf.st_mode));
+ }
+ return ret;
+}
+
+/*******************************************************************
+ Check if an object exists in the vfs.
+********************************************************************/
+
+BOOL vfs_object_exist(connection_struct *conn,const char *fname,SMB_STRUCT_STAT *sbuf)
+{
+ SMB_STRUCT_STAT st;
+
+ if (!sbuf)
+ sbuf = &st;
+
+ ZERO_STRUCTP(sbuf);
+
+ if (SMB_VFS_STAT(conn,fname,sbuf) == -1)
+ return(False);
+ return True;
+}
+
+/*******************************************************************
+ Check if a file exists in the vfs.
+********************************************************************/
+
+BOOL vfs_file_exist(connection_struct *conn, const char *fname,SMB_STRUCT_STAT *sbuf)
+{
+ SMB_STRUCT_STAT st;
+
+ if (!sbuf)
+ sbuf = &st;
+
+ ZERO_STRUCTP(sbuf);
+
+ if (SMB_VFS_STAT(conn,fname,sbuf) == -1)
+ return False;
+ return(S_ISREG(sbuf->st_mode));
+}
+
+/****************************************************************************
+ Read data from fsp on the vfs. (note: EINTR re-read differs from vfs_write_data)
+****************************************************************************/
+
+ssize_t vfs_read_data(files_struct *fsp, char *buf, size_t byte_count)
+{
+ size_t total=0;
+
+ while (total < byte_count)
+ {
+ ssize_t ret = SMB_VFS_READ(fsp, fsp->fh->fd, buf + total,
+ byte_count - total);
+
+ if (ret == 0) return total;
+ if (ret == -1) {
+ if (errno == EINTR)
+ continue;
+ else
+ return -1;
+ }
+ total += ret;
+ }
+ return (ssize_t)total;
+}
+
+ssize_t vfs_pread_data(files_struct *fsp, char *buf,
+ size_t byte_count, SMB_OFF_T offset)
+{
+ size_t total=0;
+
+ while (total < byte_count)
+ {
+ ssize_t ret = SMB_VFS_PREAD(fsp, fsp->fh->fd, buf + total,
+ byte_count - total, offset + total);
+
+ if (ret == 0) return total;
+ if (ret == -1) {
+ if (errno == EINTR)
+ continue;
+ else
+ return -1;
+ }
+ total += ret;
+ }
+ return (ssize_t)total;
+}
+
+/****************************************************************************
+ Write data to a fd on the vfs.
+****************************************************************************/
+
+ssize_t vfs_write_data(files_struct *fsp,const char *buffer,size_t N)
+{
+ size_t total=0;
+ ssize_t ret;
+
+ while (total < N) {
+ ret = SMB_VFS_WRITE(fsp,fsp->fh->fd,buffer + total,N - total);
+
+ if (ret == -1)
+ return -1;
+ if (ret == 0)
+ return total;
+
+ total += ret;
+ }
+ return (ssize_t)total;
+}
+
+ssize_t vfs_pwrite_data(files_struct *fsp,const char *buffer,
+ size_t N, SMB_OFF_T offset)
+{
+ size_t total=0;
+ ssize_t ret;
+
+ while (total < N) {
+ ret = SMB_VFS_PWRITE(fsp, fsp->fh->fd, buffer + total,
+ N - total, offset + total);
+
+ if (ret == -1)
+ return -1;
+ if (ret == 0)
+ return total;
+
+ total += ret;
+ }
+ return (ssize_t)total;
+}
+/****************************************************************************
+ An allocate file space call using the vfs interface.
+ Allocates space for a file from a filedescriptor.
+ Returns 0 on success, -1 on failure.
+****************************************************************************/
+
+int vfs_allocate_file_space(files_struct *fsp, SMB_BIG_UINT len)
+{
+ int ret;
+ SMB_STRUCT_STAT st;
+ connection_struct *conn = fsp->conn;
+ SMB_BIG_UINT space_avail;
+ SMB_BIG_UINT bsize,dfree,dsize;
+
+ release_level_2_oplocks_on_change(fsp);
+
+ /*
+ * Actually try and commit the space on disk....
+ */
+
+ DEBUG(10,("vfs_allocate_file_space: file %s, len %.0f\n", fsp->fsp_name, (double)len ));
+
+ if (((SMB_OFF_T)len) < 0) {
+ DEBUG(0,("vfs_allocate_file_space: %s negative len requested.\n", fsp->fsp_name ));
+ return -1;
+ }
+
+ ret = SMB_VFS_FSTAT(fsp,fsp->fh->fd,&st);
+ if (ret == -1)
+ return ret;
+
+ if (len == (SMB_BIG_UINT)st.st_size)
+ return 0;
+
+ if (len < (SMB_BIG_UINT)st.st_size) {
+ /* Shrink - use ftruncate. */
+
+ DEBUG(10,("vfs_allocate_file_space: file %s, shrink. Current size %.0f\n",
+ fsp->fsp_name, (double)st.st_size ));
+
+ flush_write_cache(fsp, SIZECHANGE_FLUSH);
+ if ((ret = SMB_VFS_FTRUNCATE(fsp, fsp->fh->fd, (SMB_OFF_T)len)) != -1) {
+ set_filelen_write_cache(fsp, len);
+ }
+ return ret;
+ }
+
+ /* Grow - we need to test if we have enough space. */
+
+ if (!lp_strict_allocate(SNUM(fsp->conn)))
+ return 0;
+
+ len -= st.st_size;
+ len /= 1024; /* Len is now number of 1k blocks needed. */
+ space_avail = get_dfree_info(conn,fsp->fsp_name,False,&bsize,&dfree,&dsize);
+ if (space_avail == (SMB_BIG_UINT)-1) {
+ return -1;
+ }
+
+ DEBUG(10,("vfs_allocate_file_space: file %s, grow. Current size %.0f, needed blocks = %.0f, space avail = %.0f\n",
+ fsp->fsp_name, (double)st.st_size, (double)len, (double)space_avail ));
+
+ if (len > space_avail) {
+ errno = ENOSPC;
+ return -1;
+ }
+
+ return 0;
+}
+
+/****************************************************************************
+ A vfs set_filelen call.
+ set the length of a file from a filedescriptor.
+ Returns 0 on success, -1 on failure.
+****************************************************************************/
+
+int vfs_set_filelen(files_struct *fsp, SMB_OFF_T len)
+{
+ int ret;
+
+ release_level_2_oplocks_on_change(fsp);
+ DEBUG(10,("vfs_set_filelen: ftruncate %s to len %.0f\n", fsp->fsp_name, (double)len));
+ flush_write_cache(fsp, SIZECHANGE_FLUSH);
+ if ((ret = SMB_VFS_FTRUNCATE(fsp, fsp->fh->fd, len)) != -1)
+ set_filelen_write_cache(fsp, len);
+
+ return ret;
+}
+
+/****************************************************************************
+ A vfs fill sparse call.
+ Writes zeros from the end of file to len, if len is greater than EOF.
+ Used only by strict_sync.
+ Returns 0 on success, -1 on failure.
+****************************************************************************/
+
+static char *sparse_buf;
+#define SPARSE_BUF_WRITE_SIZE (32*1024)
+
+int vfs_fill_sparse(files_struct *fsp, SMB_OFF_T len)
+{
+ int ret;
+ SMB_STRUCT_STAT st;
+ SMB_OFF_T offset;
+ size_t total;
+ size_t num_to_write;
+ ssize_t pwrite_ret;
+
+ release_level_2_oplocks_on_change(fsp);
+ ret = SMB_VFS_FSTAT(fsp,fsp->fh->fd,&st);
+ if (ret == -1) {
+ return ret;
+ }
+
+ if (len <= st.st_size) {
+ return 0;
+ }
+
+ DEBUG(10,("vfs_fill_sparse: write zeros in file %s from len %.0f to len %.0f (%.0f bytes)\n",
+ fsp->fsp_name, (double)st.st_size, (double)len, (double)(len - st.st_size)));
+
+ flush_write_cache(fsp, SIZECHANGE_FLUSH);
+
+ if (!sparse_buf) {
+ sparse_buf = SMB_CALLOC_ARRAY(char, SPARSE_BUF_WRITE_SIZE);
+ if (!sparse_buf) {
+ errno = ENOMEM;
+ return -1;
+ }
+ }
+
+ offset = st.st_size;
+ num_to_write = len - st.st_size;
+ total = 0;
+
+ while (total < num_to_write) {
+ size_t curr_write_size = MIN(SPARSE_BUF_WRITE_SIZE, (num_to_write - total));
+
+ pwrite_ret = SMB_VFS_PWRITE(fsp, fsp->fh->fd, sparse_buf, curr_write_size, offset + total);
+ if (pwrite_ret == -1) {
+ DEBUG(10,("vfs_fill_sparse: SMB_VFS_PWRITE for file %s failed with error %s\n",
+ fsp->fsp_name, strerror(errno) ));
+ return -1;
+ }
+ if (pwrite_ret == 0) {
+ return 0;
+ }
+
+ total += pwrite_ret;
+ }
+
+ set_filelen_write_cache(fsp, len);
+ return 0;
+}
+
+/****************************************************************************
+ Transfer some data (n bytes) between two file_struct's.
+****************************************************************************/
+
+static files_struct *in_fsp;
+static files_struct *out_fsp;
+
+static ssize_t read_fn(int fd, void *buf, size_t len)
+{
+ return SMB_VFS_READ(in_fsp, fd, buf, len);
+}
+
+static ssize_t write_fn(int fd, const void *buf, size_t len)
+{
+ return SMB_VFS_WRITE(out_fsp, fd, buf, len);
+}
+
+SMB_OFF_T vfs_transfer_file(files_struct *in, files_struct *out, SMB_OFF_T n)
+{
+ in_fsp = in;
+ out_fsp = out;
+
+ return transfer_file_internal(in_fsp->fh->fd, out_fsp->fh->fd, n, read_fn, write_fn);
+}
+
+/*******************************************************************
+ A vfs_readdir wrapper which just returns the file name.
+********************************************************************/
+
+char *vfs_readdirname(connection_struct *conn, void *p)
+{
+ SMB_STRUCT_DIRENT *ptr= NULL;
+ char *dname;
+
+ if (!p)
+ return(NULL);
+
+ ptr = SMB_VFS_READDIR(conn,p);
+ if (!ptr)
+ return(NULL);
+
+ dname = ptr->d_name;
+
+#ifdef NEXT2
+ if (telldir(p) < 0)
+ return(NULL);
+#endif
+
+#ifdef HAVE_BROKEN_READDIR
+ /* using /usr/ucb/cc is BAD */
+ dname = dname - 2;
+#endif
+
+ return(dname);
+}
+
+/*******************************************************************
+ A wrapper for vfs_chdir().
+********************************************************************/
+
+int vfs_ChDir(connection_struct *conn, const char *path)
+{
+ int res;
+ static pstring LastDir="";
+
+ if (strcsequal(path,"."))
+ return(0);
+
+ if (*path == '/' && strcsequal(LastDir,path))
+ return(0);
+
+ DEBUG(4,("vfs_ChDir to %s\n",path));
+
+ res = SMB_VFS_CHDIR(conn,path);
+ if (!res)
+ pstrcpy(LastDir,path);
+ return(res);
+}
+
+/* number of list structures for a caching GetWd function. */
+#define MAX_GETWDCACHE (50)
+
+static struct {
+ SMB_DEV_T dev; /* These *must* be compatible with the types returned in a stat() call. */
+ SMB_INO_T inode; /* These *must* be compatible with the types returned in a stat() call. */
+ char *dos_path; /* The pathname in DOS format. */
+ BOOL valid;
+} ino_list[MAX_GETWDCACHE];
+
+extern BOOL use_getwd_cache;
+
+/****************************************************************************
+ Prompte a ptr (to make it recently used)
+****************************************************************************/
+
+static void array_promote(char *array,int elsize,int element)
+{
+ char *p;
+ if (element == 0)
+ return;
+
+ p = (char *)SMB_MALLOC(elsize);
+
+ if (!p) {
+ DEBUG(5,("array_promote: malloc fail\n"));
+ return;
+ }
+
+ memcpy(p,array + element * elsize, elsize);
+ memmove(array + elsize,array,elsize*element);
+ memcpy(array,p,elsize);
+ SAFE_FREE(p);
+}
+
+/*******************************************************************
+ Return the absolute current directory path - given a UNIX pathname.
+ Note that this path is returned in DOS format, not UNIX
+ format. Note this can be called with conn == NULL.
+********************************************************************/
+
+char *vfs_GetWd(connection_struct *conn, char *path)
+{
+ pstring s;
+ static BOOL getwd_cache_init = False;
+ SMB_STRUCT_STAT st, st2;
+ int i;
+
+ *s = 0;
+
+ if (!use_getwd_cache)
+ return(SMB_VFS_GETWD(conn,path));
+
+ /* init the cache */
+ if (!getwd_cache_init) {
+ getwd_cache_init = True;
+ for (i=0;i<MAX_GETWDCACHE;i++) {
+ string_set(&ino_list[i].dos_path,"");
+ ino_list[i].valid = False;
+ }
+ }
+
+ /* Get the inode of the current directory, if this doesn't work we're
+ in trouble :-) */
+
+ if (SMB_VFS_STAT(conn, ".",&st) == -1) {
+ /* Known to fail for root: the directory may be
+ * NFS-mounted and exported with root_squash (so has no root access). */
+ DEBUG(1,("vfs_GetWd: couldn't stat \".\" path=%s error %s (NFS problem ?)\n", path, strerror(errno) ));
+ return(SMB_VFS_GETWD(conn,path));
+ }
+
+
+ for (i=0; i<MAX_GETWDCACHE; i++) {
+ if (ino_list[i].valid) {
+
+ /* If we have found an entry with a matching inode and dev number
+ then find the inode number for the directory in the cached string.
+ If this agrees with that returned by the stat for the current
+ directory then all is o.k. (but make sure it is a directory all
+ the same...) */
+
+ if (st.st_ino == ino_list[i].inode && st.st_dev == ino_list[i].dev) {
+ if (SMB_VFS_STAT(conn,ino_list[i].dos_path,&st2) == 0) {
+ if (st.st_ino == st2.st_ino && st.st_dev == st2.st_dev &&
+ (st2.st_mode & S_IFMT) == S_IFDIR) {
+ pstrcpy (path, ino_list[i].dos_path);
+
+ /* promote it for future use */
+ array_promote((char *)&ino_list[0],sizeof(ino_list[0]),i);
+ return (path);
+ } else {
+ /* If the inode is different then something's changed,
+ scrub the entry and start from scratch. */
+ ino_list[i].valid = False;
+ }
+ }
+ }
+ }
+ }
+
+ /* We don't have the information to hand so rely on traditional methods.
+ The very slow getcwd, which spawns a process on some systems, or the
+ not quite so bad getwd. */
+
+ if (!SMB_VFS_GETWD(conn,s)) {
+ DEBUG(0,("vfs_GetWd: SMB_VFS_GETWD call failed, errno %s\n",strerror(errno)));
+ return (NULL);
+ }
+
+ pstrcpy(path,s);
+
+ DEBUG(5,("vfs_GetWd %s, inode %.0f, dev %.0f\n",s,(double)st.st_ino,(double)st.st_dev));
+
+ /* add it to the cache */
+ i = MAX_GETWDCACHE - 1;
+ string_set(&ino_list[i].dos_path,s);
+ ino_list[i].dev = st.st_dev;
+ ino_list[i].inode = st.st_ino;
+ ino_list[i].valid = True;
+
+ /* put it at the top of the list */
+ array_promote((char *)&ino_list[0],sizeof(ino_list[0]),i);
+
+ return (path);
+}
+
+BOOL canonicalize_path(connection_struct *conn, pstring path)
+{
+#ifdef REALPATH_TAKES_NULL
+ char *resolved_name = SMB_VFS_REALPATH(conn,path,NULL);
+ if (!resolved_name) {
+ return False;
+ }
+ pstrcpy(path, resolved_name);
+ SAFE_FREE(resolved_name);
+ return True;
+#else
+#ifdef PATH_MAX
+ char resolved_name_buf[PATH_MAX+1];
+#else
+ pstring resolved_name_buf;
+#endif
+ char *resolved_name = SMB_VFS_REALPATH(conn,path,resolved_name_buf);
+ if (!resolved_name) {
+ return False;
+ }
+ pstrcpy(path, resolved_name);
+ return True;
+#endif /* REALPATH_TAKES_NULL */
+}
+
+/*******************************************************************
+ Reduce a file name, removing .. elements and checking that
+ it is below dir in the heirachy. This uses realpath.
+********************************************************************/
+
+BOOL reduce_name(connection_struct *conn, const pstring fname)
+{
+#ifdef REALPATH_TAKES_NULL
+ BOOL free_resolved_name = True;
+#else
+#ifdef PATH_MAX
+ char resolved_name_buf[PATH_MAX+1];
+#else
+ pstring resolved_name_buf;
+#endif
+ BOOL free_resolved_name = False;
+#endif
+ char *resolved_name = NULL;
+ size_t con_path_len = strlen(conn->connectpath);
+ char *p = NULL;
+ int saved_errno = errno;
+
+ DEBUG(3,("reduce_name [%s] [%s]\n", fname, conn->connectpath));
+
+#ifdef REALPATH_TAKES_NULL
+ resolved_name = SMB_VFS_REALPATH(conn,fname,NULL);
+#else
+ resolved_name = SMB_VFS_REALPATH(conn,fname,resolved_name_buf);
+#endif
+
+ if (!resolved_name) {
+ switch (errno) {
+ case ENOTDIR:
+ DEBUG(3,("reduce_name: Component not a directory in getting realpath for %s\n", fname));
+ errno = saved_errno;
+ return False;
+ case ENOENT:
+ {
+ pstring tmp_fname;
+ fstring last_component;
+ /* Last component didn't exist. Remove it and try and canonicalise the directory. */
+
+ pstrcpy(tmp_fname, fname);
+ p = strrchr_m(tmp_fname, '/');
+ if (p) {
+ *p++ = '\0';
+ fstrcpy(last_component, p);
+ } else {
+ fstrcpy(last_component, tmp_fname);
+ pstrcpy(tmp_fname, ".");
+ }
+
+#ifdef REALPATH_TAKES_NULL
+ resolved_name = SMB_VFS_REALPATH(conn,tmp_fname,NULL);
+#else
+ resolved_name = SMB_VFS_REALPATH(conn,tmp_fname,resolved_name_buf);
+#endif
+ if (!resolved_name) {
+ DEBUG(3,("reduce_name: couldn't get realpath for %s\n", fname));
+ errno = saved_errno;
+ return False;
+ }
+ pstrcpy(tmp_fname, resolved_name);
+ pstrcat(tmp_fname, "/");
+ pstrcat(tmp_fname, last_component);
+#ifdef REALPATH_TAKES_NULL
+ SAFE_FREE(resolved_name);
+ resolved_name = SMB_STRDUP(tmp_fname);
+ if (!resolved_name) {
+ DEBUG(0,("reduce_name: malloc fail for %s\n", tmp_fname));
+ errno = saved_errno;
+ return False;
+ }
+#else
+#ifdef PATH_MAX
+ safe_strcpy(resolved_name_buf, tmp_fname, PATH_MAX);
+#else
+ pstrcpy(resolved_name_buf, tmp_fname);
+#endif
+ resolved_name = resolved_name_buf;
+#endif
+ break;
+ }
+ default:
+ DEBUG(1,("reduce_name: couldn't get realpath for %s\n", fname));
+ /* Don't restore the saved errno. We need to return the error that
+ realpath caused here as it was not one of the cases we handle. JRA. */
+ return False;
+ }
+ }
+
+ DEBUG(10,("reduce_name realpath [%s] -> [%s]\n", fname, resolved_name));
+
+ if (*resolved_name != '/') {
+ DEBUG(0,("reduce_name: realpath doesn't return absolute paths !\n"));
+ if (free_resolved_name)
+ SAFE_FREE(resolved_name);
+ errno = saved_errno;
+ return False;
+ }
+
+ /* Check for widelinks allowed. */
+ if (!lp_widelinks(SNUM(conn)) && (strncmp(conn->connectpath, resolved_name, con_path_len) != 0)) {
+ DEBUG(2, ("reduce_name: Bad access attempt: %s is a symlink outside the share path", fname));
+ if (free_resolved_name)
+ SAFE_FREE(resolved_name);
+ errno = EACCES;
+ return False;
+ }
+
+ /* Check if we are allowing users to follow symlinks */
+ /* Patch from David Clerc <David.Clerc@cui.unige.ch>
+ University of Geneva */
+
+#ifdef S_ISLNK
+ if (!lp_symlinks(SNUM(conn))) {
+ SMB_STRUCT_STAT statbuf;
+ if ( (SMB_VFS_LSTAT(conn,fname,&statbuf) != -1) &&
+ (S_ISLNK(statbuf.st_mode)) ) {
+ if (free_resolved_name)
+ SAFE_FREE(resolved_name);
+ DEBUG(3,("reduce_name: denied: file path name %s is a symlink\n",resolved_name));
+ errno = EACCES;
+ return False;
+ }
+ }
+#endif
+
+ DEBUG(3,("reduce_name: %s reduced to %s\n", fname, resolved_name));
+ if (free_resolved_name)
+ SAFE_FREE(resolved_name);
+ errno = saved_errno;
+ return(True);
+}
projects / samba / blobdiff