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/*
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 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/globals.h"
/* From lib/error.c */
extern struct unix_error_map unix_dos_nt_errmap[];
bool use_nt_status(void)
{
return lp_nt_status_support() && (global_client_caps & CAP_STATUS32);
}
/****************************************************************************
Create an error packet. Normally called using the ERROR() macro.
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).
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 is the path taken by calling reply_doserror(req, eclass, ecode).
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);
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_nterror(req, NT_STATUS_DOS(eclass, ecode)).
This is *very* unintuitive and the code should be changed so all
current callers of reply_doserror() which don't care if they return NTSTATUS
or DOS errors are changed to call reply_nterror() instead.
reply_doserror() should then be changed to return DOS errors only and
replace all current callers of reply_nterror(req, NT_STATUS_DOS(eclass, ecode)).
I'll update this comment once the conversion is done. JRA.
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.
****************************************************************************/
void error_packet_set(char *outbuf, uint8 eclass, uint32 ecode, NTSTATUS ntstatus, int line, const char *file)
{
bool force_nt_status = False;
bool force_dos_status = False;
if (eclass == (uint8)-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",
file, line,
(int)CVAL(outbuf,smb_com),
smb_fn_name(CVAL(outbuf,smb_com)),
nt_errstr(ntstatus)));
} else {
/* We're returning a DOS error only. */
if (NT_STATUS_IS_DOS(ntstatus)) {
eclass = NT_STATUS_DOS_CLASS(ntstatus);
ecode = NT_STATUS_DOS_CODE(ntstatus);
} else 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);
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));
}
}
int error_packet(char *outbuf, uint8 eclass, uint32 ecode, NTSTATUS ntstatus, int line, const char *file)
{
int outsize = srv_set_message(outbuf,0,0,True);
error_packet_set(outbuf, eclass, ecode, ntstatus, line, file);
return outsize;
}
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);
}
/****************************************************************************
NB. This DOES NOT FORCE A DOS ERROR on the wire (although it
probably should, I'm moving the rest of the Samba code towards that
meaning. JRA.
****************************************************************************/
void reply_dos_error(struct smb_request *req, uint8 eclass, uint32 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_OK,
line,
file);
}
void reply_both_error(struct smb_request *req, uint8 eclass, uint32 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_nterror(req, NT_STATUS_DOS(ERRDOS, ERRnofids));
} else {
reply_nterror(req, status);
}
}
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