summaryrefslogtreecommitdiff
path: root/source3/smbd/error.c
blob: 6655a6fb082a2368a3781bc36eeb85f880f8f155 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/* 
   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/smbd.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 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);

 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.
****************************************************************************/

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);
}

/****************************************************************************
 Forces a DOS error on the wire.
****************************************************************************/

void reply_force_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_DOS(eclass, ecode),
			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_force_doserror(req, ERRDOS, ERRnofids);
	} else {
		reply_nterror(req, status);
	}
}