Add vfs_readonly module which allows to enforce periodic read-only limit on a share based on a specified start and end dates according to date(1) format

(This used to be commit 8b263c2fda89ff6aa2dc3a60460c5d46cf0814c6)

source3/Makefile.in

@@ -300,6 +300,7 @@ VFS_FAKE_PERMS_OBJ = modules/vfs_fake_perms.o
 VFS_RECYCLE_OBJ = modules/vfs_recycle.o
 VFS_NETATALK_OBJ = modules/vfs_netatalk.o
 VFS_DEFAULT_QUOTA_OBJ = modules/vfs_default_quota.o
+VFS_READONLY_OBJ = modules/vfs_readonly.o modules/getdate.o
 
 PLAINTEXT_AUTH_OBJ = auth/pampass.o auth/pass_check.o
 
@@ -1065,6 +1066,11 @@ bin/default_quota.@SHLIBEXT@: $(VFS_DEFAULT_QUOTA_OBJ:.o=.po)
 	@$(SHLD) $(LDSHFLAGS) -o $@ $(VFS_DEFAULT_QUOTA_OBJ:.o=.po) \
 		@SONAMEFLAG@`basename $@`
 
+bin/readonly.@SHLIBEXT@: $(VFS_READONLY_OBJ:.o=.po)
+	@echo "Building plugin $@"
+	@$(SHLD) $(LDSHFLAGS) -o $@ $(VFS_READONLY_OBJ:.o=.po) \
+		@SONAMEFLAG@`basename $@`
+
 bin/wbinfo@EXEEXT@: $(WBINFO_OBJ) @BUILD_POPT@ bin/.dummy
 	@echo Linking $@
 	@$(LINK) -o $@ $(WBINFO_OBJ) $(LIBS) @POPTLIBS@

source3/configure.in

@@ -287,7 +287,7 @@ dnl These have to be built static:
 default_static_modules="pdb_smbpasswd pdb_tdbsam rpc_lsa rpc_samr rpc_reg rpc_wks rpc_net rpc_dfs rpc_srv rpc_spoolss auth_rhosts auth_sam auth_unix auth_winbind auth_server auth_domain auth_builtin"
 
 dnl These are preferably build shared, and static if dlopen() is not available
-default_shared_modules="vfs_recycle vfs_audit vfs_extd_audit vfs_netatalk vfs_fake_perms vfs_default_quota"
+default_shared_modules="vfs_recycle vfs_audit vfs_extd_audit vfs_netatalk vfs_fake_perms vfs_default_quota vfs_readonly"
 
 if test "x$developer" = xyes; then
    default_static_modules="$default_static_modules rpc_echo"
@@ -3957,6 +3957,7 @@ SMB_MODULE(vfs_extd_audit, \$(VFS_EXTD_AUDIT_OBJ), "bin/extd_audit.$SHLIBEXT", V
 SMB_MODULE(vfs_netatalk, \$(VFS_NETATALK_OBJ), "bin/netatalk.$SHLIBEXT", VFS)
 SMB_MODULE(vfs_fake_perms, \$(VFS_FAKE_PERMS_OBJ), "bin/fake_perms.$SHLIBEXT", VFS)
 SMB_MODULE(vfs_default_quota, \$(VFS_DEFAULT_QUOTA_OBJ), "bin/default_quota.$SHLIBEXT", VFS)
+SMB_MODULE(vfs_readonly, \$(VFS_READONLY_OBJ), "bin/readonly.$SHLIBEXT", VFS)
 SMB_SUBSYSTEM(VFS)
 
 AC_DEFINE_UNQUOTED(STRING_STATIC_MODULES, "$string_static_modules", [String list of builtin modules])

source3/modules/getdate.h

@@ -0,0 +1,46 @@
+/*  Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc.
+
+   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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#ifndef PARAMS
+# if defined PROTOTYPES || (defined __STDC__ && __STDC__)
+#  define PARAMS(Args) Args
+# else
+#  define PARAMS(Args) ()
+# endif
+#endif
+
+#ifdef vms
+# include <types.h>
+# include <time.h>
+#else
+# include <sys/types.h>
+# if TIME_WITH_SYS_TIME
+#  include <sys/time.h>
+#  include <time.h>
+# else
+#  if HAVE_SYS_TIME_H
+#   include <sys/time.h>
+#  else
+#   include <time.h>
+#  endif
+# endif
+#endif /* defined (vms) */
+
+time_t get_date PARAMS ((const char *p, const time_t *now));

source3/modules/vfs_readonly.c

@@ -0,0 +1,98 @@
+/*
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   VFS module to perform read-only limitation based on a time period
+   Copyright (C) Alexander Bokovoy 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.
+
+   This work was sponsored by Optifacio Software Services, Inc.
+*/
+
+#include "includes.h"
+#include "getdate.h"
+
+/*
+  This module performs a read-only limitation for specified share 
+  (or all of them if it is loaded in a [global] section) based on period
+  definition in smb.conf. You can stack this module multiple times under 
+  different names to get multiple limit intervals.
+
+  The module uses get_date() function from coreutils' date utility to parse
+  specified dates according to date(1) rules. Look into info page for date(1)
+  to understand the syntax.
+
+  The module accepts one parameter: 
+
+  readonly: period = "begin date","end date"
+
+  where "begin date" and "end date" are mandatory and should comply with date(1) 
+  syntax for date strings.
+
+  Example:
+
+  readonly: period = "today 14:00","today 15:00"
+
+  Default:
+
+  readonly: period = "today 0:0:0","tomorrow 0:0:0"
+
+  The default covers whole day thus making the share readonly
+
+ */
+
+#define MODULE_NAME "readonly"
+static int readonly_connect(vfs_handle_struct *handle, 
+			    connection_struct *conn, 
+			    const char *service, 
+			    const char *user)    
+{
+  const char *period_def[] = {"today 0:0:0", "tomorrow 0:0:0"};
+
+  const char **period = lp_parm_string_list(SNUM(handle->conn),
+					     (handle->param ? handle->param : MODULE_NAME),
+					     "period", period_def); 
+
+  if (period && period[0] && period[1]) {
+    time_t current_time = time(NULL);
+    time_t begin_period = get_date(period[0], &current_time);
+    time_t end_period   = get_date(period[1], &current_time);
+
+    if ((current_time >= begin_period) && (current_time <= end_period)) {
+      conn->read_only = True;
+    }
+
+    return SMB_VFS_NEXT_CONNECT(handle, conn, service, user);
+
+  } else {
+    
+    return 1;
+    
+  }
+}
+
+
+/* VFS operations structure */
+
+static vfs_op_tuple readonly_op_tuples[] = {
+	/* Disk operations */
+  {SMB_VFS_OP(readonly_connect),	SMB_VFS_OP_CONNECT, SMB_VFS_LAYER_OPAQUE},
+  {SMB_VFS_OP(NULL),   		SMB_VFS_OP_NOOP,    SMB_VFS_LAYER_NOOP}
+};
+
+NTSTATUS init_module(void)
+{
+  return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, MODULE_NAME, readonly_op_tuples);
+}