Add NT quota support. Patch from Stefan (metze) Metzemacher

1. Allows to change quota settings for shared mount points from Win2K and WinXP from Explorer properties tab
2. Disabled by default and when requested, will be probed and enabled only on Linux where it works
3. Was tested for approx. two weeks now on Linux by two independent QA teams, have not found any bugs so far
Documentation to follow
(This used to be commit 4bf022ce9e45be85609426762ba2644ac2031326)

1 files changed, 166 insertions, 0 deletions

diff --git a/source3/smbd/fake_file.c b/source3/smbd/fake_file.c
new file mode 100644
index 0000000000..86d78e039a
--- /dev/null
+++ b/source3/smbd/fake_file.c
@@ -0,0 +1,166 @@
+/* 
+   Unix SMB/CIFS implementation.
+   FAKE FILE suppport, for faking up special files windows want access to
+   Copyright (C) Stefan (metze) Metzmacher	2003
+   
+   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.
+*/
+
+#include "includes.h"
+
+/****************************************************************************
+ Open a file with a share mode.
+****************************************************************************/
+files_struct *open_fake_file_shared1(enum FAKE_FILE_TYPE fake_file_type, connection_struct *conn,char *fname,
+				SMB_STRUCT_STAT *psbuf, 
+				uint32 desired_access, 
+				int share_mode,int ofun, mode_t mode,int oplock_request, 
+				int *Access,int *action)
+{
+	extern struct current_user current_user;
+	int flags=0;
+	files_struct *fsp = NULL;
+
+	if (fake_file_type == 0) {
+		return open_file_shared1(conn,fname,psbuf,desired_access,
+					share_mode,ofun,mode,
+					oplock_request,Access,action);	
+	}
+
+	/* access check */
+	if (conn->admin_user != True) {
+		DEBUG(1,("access_denied to service[%s] file[%s] user[%s]\n",
+			lp_servicename(SNUM(conn)),fname,conn->user));
+		errno = EACCES;
+		return NULL;
+	}
+
+	fsp = file_new(conn);
+	if(!fsp)
+		return NULL;
+
+	DEBUG(5,("open_fake_file_shared1: fname = %s, FID = %d, share_mode = %x, ofun = %x, mode = %o, oplock request = %d\n",
+		fname, fsp->fnum, share_mode, ofun, (int)mode,  oplock_request ));
+
+	if (!check_name(fname,conn)) {
+		file_free(fsp);
+		return NULL;
+	} 
+
+	fsp->fd = -1;
+	fsp->mode = psbuf->st_mode;
+	fsp->inode = psbuf->st_ino;
+	fsp->dev = psbuf->st_dev;
+	fsp->vuid = current_user.vuid;
+	fsp->size = psbuf->st_size;
+	fsp->pos = -1;
+	fsp->can_lock = True;
+	fsp->can_read = ((flags & O_WRONLY)==0);
+	fsp->can_write = ((flags & (O_WRONLY|O_RDWR))!=0);
+	fsp->share_mode = 0;
+	fsp->desired_access = desired_access;
+	fsp->print_file = False;
+	fsp->modified = False;
+	fsp->oplock_type = NO_OPLOCK;
+	fsp->sent_oplock_break = NO_BREAK_SENT;
+	fsp->is_directory = False;
+	fsp->is_stat = False;
+	fsp->directory_delete_on_close = False;
+	fsp->conn = conn;
+	string_set(&fsp->fsp_name,fname);
+	fsp->wcp = NULL; /* Write cache pointer. */
+	
+	fsp->fake_file_handle = init_fake_file_handle(fake_file_type);
+	
+	if (fsp->fake_file_handle==NULL) {
+		file_free(fsp);
+		return NULL;
+	}
+
+	conn->num_files_open++;
+	return fsp;
+}
+
+static FAKE_FILE fake_files[] = {
+#ifdef WITH_QUOTAS
+	{FAKE_FILE_NAME_QUOTA,	FAKE_FILE_TYPE_QUOTA,	init_quota_handle,	destroy_quota_handle},
+#endif /* WITH_QUOTAS */
+	{NULL,			FAKE_FILE_TYPE_NONE,	NULL,			NULL }
+};
+
+int is_fake_file(char *fname)
+{
+	int i;
+
+	if (!fname)
+		return 0;
+
+	for (i=0;fake_files[i].name!=NULL;i++) {
+		if (strncmp(fname,fake_files[i].name,strlen(fake_files[i].name))==0) {
+			DEBUG(5,("is_fake_file: [%s] is a fake file\n",fname));
+			return fake_files[i].type;
+		}
+	}
+
+	return FAKE_FILE_TYPE_NONE;
+}
+
+struct _FAKE_FILE_HANDLE *init_fake_file_handle(enum FAKE_FILE_TYPE type)
+{
+	TALLOC_CTX *mem_ctx = NULL;
+	FAKE_FILE_HANDLE *fh = NULL;
+	int i;
+
+	for (i=0;fake_files[i].name!=NULL;i++) {
+		if (fake_files[i].type==type) {
+			DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));
+
+			if ((mem_ctx=talloc_init("fake_file_handle"))==NULL) {
+				DEBUG(0,("talloc_init(fake_file_handle) failed.\n"));
+				return NULL;	
+			}
+
+			if ((fh =(FAKE_FILE_HANDLE *)talloc_zero(mem_ctx, sizeof(FAKE_FILE_HANDLE)))==NULL) {
+				DEBUG(0,("talloc_zero() failed.\n"));
+				talloc_destroy(mem_ctx);
+				return NULL;
+			}
+
+			fh->type = type;
+			fh->mem_ctx = mem_ctx;
+
+			if (fake_files[i].init_pd)
+				fh->pd = fake_files[i].init_pd(fh->mem_ctx);
+
+			fh->free_pd = fake_files[i].free_pd;
+
+			return fh;
+		}
+	}
+
+	return NULL;	
+}
+
+void destroy_fake_file_handle(FAKE_FILE_HANDLE **fh)
+{
+	if (!fh||!(*fh))
+		return ;
+
+	if ((*fh)->free_pd)
+		(*fh)->free_pd(&(*fh)->pd);		
+
+	talloc_destroy((*fh)->mem_ctx);
+	(*fh) = NULL;
+}