/* 
   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"

/* From lib/error.c */
extern struct unix_error_map unix_dos_nt_errmap[];

extern uint32 global_client_caps;

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 only and status to NT_STATUS_OK forces DOS errors.
 Setting status only and eclass and ecode to zero forces NT errors.
 If the override errors are set they take precedence over any passed in values.
****************************************************************************/

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);
}

void reply_force_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, -1, -1, ntstatus, line, file);
}

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 {
		reply_nterror(req, status);
	}
}

void reply_unix_error(struct smb_request *req, uint8 defclass, uint32 defcode,
			NTSTATUS defstatus, int line, const char *file)
{
	int eclass=defclass;
	int ecode=defcode;
	NTSTATUS ntstatus = defstatus;
	int i=0;

	TALLOC_FREE(req->outbuf);
	reply_outbuf(req, 0, 0);

	if (errno != 0) {
		DEBUG(3,("unix_error_packet: error string = %s\n",
			strerror(errno)));

		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++;
		}
	}

	error_packet_set((char *)req->outbuf, eclass, ecode, ntstatus,
		line, file);
}
