Unix SMB/CIFS implementation.
error packet handling
Copyright (C) Andrew Tridgell 1992-1998
-
+
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
+ the Free Software Foundation; either version 3 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.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
+#include "smbd/smbd.h"
+#include "smbd/globals.h"
-/* these can be set by some functions to override the error codes */
-int unix_ERR_class=SMB_SUCCESS;
-int unix_ERR_code=0;
-
-/* From lib/error.c */
-extern struct unix_error_map unix_dos_nt_errmap[];
-
-/****************************************************************************
- Create an error packet from a cached error.
-****************************************************************************/
-
-int cached_error_packet(char *outbuf,files_struct *fsp,int line,const char *file)
+bool use_nt_status(void)
{
- write_bmpx_struct *wbmpx = fsp->wbmpx_ptr;
-
- int32 eclass = wbmpx->wr_errclass;
- int32 err = wbmpx->wr_error;
-
- /* We can now delete the auxiliary struct */
- free((char *)wbmpx);
- fsp->wbmpx_ptr = NULL;
- return error_packet(outbuf,NT_STATUS_OK,eclass,err,line,file);
+ return lp_nt_status_support() && (global_client_caps & CAP_STATUS32);
}
/****************************************************************************
- Create an error packet from errno.
-****************************************************************************/
+ Create an error packet. Normally called using the ERROR() macro.
-int unix_error_packet(char *outbuf,int def_class,uint32 def_code,
- int line, const char *file)
-{
- int eclass=def_class;
- int ecode=def_code;
- NTSTATUS ntstatus = NT_STATUS_OK;
- int i=0;
-
- if (unix_ERR_class != SMB_SUCCESS) {
- eclass = unix_ERR_class;
- ecode = unix_ERR_code;
- unix_ERR_class = SMB_SUCCESS;
- unix_ERR_code = 0;
- } else {
- while (unix_dos_nt_errmap[i].dos_class != 0) {
- if (unix_dos_nt_errmap[i].unix_error == errno) {
- eclass = unix_dos_nt_errmap[i].dos_class;
- ecode = unix_dos_nt_errmap[i].dos_code;
- ntstatus = unix_dos_nt_errmap[i].nt_error;
- break;
- }
- i++;
- }
- }
+ Setting eclass and ecode to zero and status to a valid NT error will
+ reply with an NT error if the client supports CAP_STATUS32, otherwise
+ it maps to and returns a DOS error if the client doesn't support CAP_STATUS32.
+ This is the normal mode of calling this function via reply_nterror(req, status).
- return error_packet(outbuf,ntstatus,eclass,ecode,line,file);
-}
+ Setting eclass and ecode to non-zero and status to NT_STATUS_OK (0) will map
+ from a DOS error to an NT error and reply with an NT error if the client
+ supports CAP_STATUS32, otherwise it replies with the given DOS error.
+ This mode is currently not used in the server.
+ Setting both eclass, ecode and status to non-zero values allows a non-default
+ mapping from NT error codes to DOS error codes, and will return one or the
+ other depending on the client supporting CAP_STATUS32 or not. This is the
+ path taken by calling reply_botherror(req, eclass, ecode, status);
-/****************************************************************************
- Create an error packet. Normally called using the ERROR() macro.
+ Setting status to NT_STATUS_DOS(eclass, ecode) forces DOS errors even if the
+ client supports CAP_STATUS32. This is the path taken to force a DOS error
+ reply by calling reply_force_doserror(req, eclass, ecode).
+
+ Setting status only and eclass to -1 forces NT errors even if the client
+ doesn't support CAP_STATUS32. This mode is currently never used in the
+ server.
****************************************************************************/
-int error_packet(char *outbuf,NTSTATUS ntstatus,
- uint8 eclass,uint32 ecode,int line, const char *file)
+void error_packet_set(char *outbuf, uint8_t eclass, uint32_t ecode, NTSTATUS ntstatus, int line, const char *file)
{
- int outsize = set_message(outbuf,0,0,True);
- extern uint32 global_client_caps;
-
- if (errno != 0)
- DEBUG(3,("error string = %s\n",strerror(errno)));
-
- /*
- * We can explicitly force 32 bit error codes even when the
- * parameter "nt status" is set to no by pre-setting the
- * FLAGS2_32_BIT_ERROR_CODES bit in the smb_flg2 outbuf.
- * This is to allow work arounds for client bugs that are needed
- * when talking with clients that normally expect nt status codes. JRA.
- */
-
- if ((lp_nt_status_support() || (SVAL(outbuf,smb_flg2) & FLAGS2_32_BIT_ERROR_CODES)) && (global_client_caps & CAP_STATUS32)) {
- if (NT_STATUS_V(ntstatus) == 0 && eclass)
+ bool force_nt_status = False;
+ bool force_dos_status = False;
+
+ if (eclass == (uint8_t)-1) {
+ force_nt_status = True;
+ } else if (NT_STATUS_IS_DOS(ntstatus)) {
+ force_dos_status = True;
+ }
+
+ if (force_nt_status || (!force_dos_status && lp_nt_status_support() && (global_client_caps & CAP_STATUS32))) {
+ /* We're returning an NT error. */
+ if (NT_STATUS_V(ntstatus) == 0 && eclass) {
ntstatus = dos_to_ntstatus(eclass, ecode);
+ }
SIVAL(outbuf,smb_rcls,NT_STATUS_V(ntstatus));
SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)|FLAGS2_32_BIT_ERROR_CODES);
- DEBUG(3,("error packet at %s(%d) cmd=%d (%s) %s\n",
+ /* This must not start with the word 'error', as this
+ * is reserved in the subunit stream protocol, causing
+ * false errors to show up when debugging is turned
+ * on */
+ DEBUG(3,("NT error packet at %s(%d) cmd=%d (%s) %s\n",
file, line,
(int)CVAL(outbuf,smb_com),
smb_fn_name(CVAL(outbuf,smb_com)),
- get_nt_error_msg(ntstatus)));
- return outsize;
- }
+ nt_errstr(ntstatus)));
+ } else {
+ /* We're returning a DOS error only,
+ * nt_status_to_dos() pulls DOS error codes out of the
+ * NTSTATUS */
+ if (NT_STATUS_IS_DOS(ntstatus) || (eclass == 0 && NT_STATUS_V(ntstatus))) {
+ ntstatus_to_dos(ntstatus, &eclass, &ecode);
+ }
- if (eclass == 0 && NT_STATUS_V(ntstatus))
- ntstatus_to_dos(ntstatus, &eclass, &ecode);
+ SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)&~FLAGS2_32_BIT_ERROR_CODES);
+ SSVAL(outbuf,smb_rcls,eclass);
+ SSVAL(outbuf,smb_err,ecode);
+
+ /* This must not start with the word 'error', as this
+ * is reserved in the subunit stream protocol, causing
+ * false errors to show up when debugging is turned
+ * on */
+ DEBUG(3,("DOS error packet at %s(%d) cmd=%d (%s) eclass=%d ecode=%d\n",
+ file, line,
+ (int)CVAL(outbuf,smb_com),
+ smb_fn_name(CVAL(outbuf,smb_com)),
+ eclass,
+ ecode));
+ }
+}
- SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)&~FLAGS2_32_BIT_ERROR_CODES);
- SSVAL(outbuf,smb_rcls,eclass);
- SSVAL(outbuf,smb_err,ecode);
+size_t error_packet(char *outbuf, uint8_t eclass, uint32_t ecode, NTSTATUS ntstatus, int line, const char *file)
+{
+ size_t outsize = srv_set_message(outbuf,0,0,True);
+ error_packet_set(outbuf, eclass, ecode, ntstatus, line, file);
+ return outsize;
+}
- DEBUG(3,("error packet at %s(%d) cmd=%d (%s) eclass=%d ecode=%d\n",
- file, line,
- (int)CVAL(outbuf,smb_com),
- smb_fn_name(CVAL(outbuf,smb_com)),
- eclass,
- ecode));
+void reply_nt_error(struct smb_request *req, NTSTATUS ntstatus,
+ int line, const char *file)
+{
+ TALLOC_FREE(req->outbuf);
+ reply_outbuf(req, 0, 0);
+ error_packet_set((char *)req->outbuf, 0, 0, ntstatus, line, file);
+}
- return outsize;
+/****************************************************************************
+ Forces a DOS error on the wire.
+****************************************************************************/
+
+void reply_force_dos_error(struct smb_request *req, uint8_t eclass, uint32_t ecode,
+ int line, const char *file)
+{
+ TALLOC_FREE(req->outbuf);
+ reply_outbuf(req, 0, 0);
+ error_packet_set((char *)req->outbuf,
+ eclass, ecode,
+ NT_STATUS_DOS(eclass, ecode),
+ line,
+ file);
+}
+
+void reply_both_error(struct smb_request *req, uint8_t eclass, uint32_t ecode,
+ NTSTATUS status, int line, const char *file)
+{
+ TALLOC_FREE(req->outbuf);
+ reply_outbuf(req, 0, 0);
+ error_packet_set((char *)req->outbuf, eclass, ecode, status,
+ line, file);
+}
+
+void reply_openerror(struct smb_request *req, NTSTATUS status)
+{
+ if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_COLLISION)) {
+ /*
+ * We hit an existing file, and if we're returning DOS
+ * error codes OBJECT_NAME_COLLISION would map to
+ * ERRDOS/183, we need to return ERRDOS/80, see bug
+ * 4852.
+ */
+ reply_botherror(req, NT_STATUS_OBJECT_NAME_COLLISION,
+ ERRDOS, ERRfilexists);
+ } else if (NT_STATUS_EQUAL(status, NT_STATUS_TOO_MANY_OPENED_FILES)) {
+ /* EMFILE always seems to be returned as a DOS error.
+ * See bug 6837. NOTE this forces a DOS error on the wire
+ * even though it's calling reply_nterror(). */
+ reply_force_doserror(req, ERRDOS, ERRnofids);
+ } else {
+ reply_nterror(req, status);
+ }
}
git.samba.org / metze / samba / wip.git / blobdiff