source/smbd/error.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    error packet handling
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 /* From lib/error.c */
  24 extern struct unix_error_map unix_dos_nt_errmap[];
  25
  26 extern uint32 global_client_caps;
  27
  28 /****************************************************************************
  29  Create an error packet from a cached error.
  30 ****************************************************************************/
  31
  32 int cached_error_packet(char *outbuf,files_struct *fsp,int line,const char *file)
  33 {
  34         write_bmpx_struct *wbmpx = fsp->wbmpx_ptr;
  35         int32 eclass = wbmpx->wr_errclass;
  36         int32 err = wbmpx->wr_error;
  37         NTSTATUS ntstatus = wbmpx->wr_status;
  38
  39         /* We can now delete the auxiliary struct */
  40         SAFE_FREE(fsp->wbmpx_ptr);
  41         return error_packet(outbuf,eclass,err,ntstatus,line,file);
  42 }
  43
  44 /****************************************************************************
  45  Create an error packet from errno.
  46 ****************************************************************************/
  47
  48 int unix_error_packet(char *outbuf,int def_class,uint32 def_code, NTSTATUS def_status, int line, const char *file)
  49 {
  50         int eclass=def_class;
  51         int ecode=def_code;
  52         NTSTATUS ntstatus = def_status;
  53         int i=0;
  54
  55         if (errno != 0) {
  56                 DEBUG(3,("unix_error_packet: error string = %s\n",strerror(errno)));
  57
  58                 while (unix_dos_nt_errmap[i].dos_class != 0) {
  59                         if (unix_dos_nt_errmap[i].unix_error == errno) {
  60                                 eclass = unix_dos_nt_errmap[i].dos_class;
  61                                 ecode = unix_dos_nt_errmap[i].dos_code;
  62                                 ntstatus = unix_dos_nt_errmap[i].nt_error;
  63                                 break;
  64                         }
  65                         i++;
  66                 }
  67         }
  68
  69         return error_packet(outbuf,eclass,ecode,ntstatus,line,file);
  70 }
  71
  72 BOOL use_nt_status(void)
  73 {
  74         return lp_nt_status_support() && (global_client_caps & CAP_STATUS32);
  75 }
  76
  77 /****************************************************************************
  78  Create an error packet. Normally called using the ERROR() macro.
  79  Setting eclass and ecode only and status to NT_STATUS_OK forces DOS errors.
  80  Setting status only and eclass and ecode to zero forces NT errors.
  81  If the override errors are set they take precedence over any passed in values.
  82 ****************************************************************************/
  83
  84 void error_packet_set(char *outbuf, uint8 eclass, uint32 ecode, NTSTATUS ntstatus, int line, const char *file)
  85 {
  86         BOOL force_nt_status = False;
  87         BOOL force_dos_status = False;
  88
  89         if (eclass == (uint8)-1) {
  90                 force_nt_status = True;
  91         } else if (NT_STATUS_IS_DOS(ntstatus)) {
  92                 force_dos_status = True;
  93         }
  94
  95         if (force_nt_status || (!force_dos_status && lp_nt_status_support() && (global_client_caps & CAP_STATUS32))) {
  96                 /* We're returning an NT error. */
  97                 if (NT_STATUS_V(ntstatus) == 0 && eclass) {
  98                         ntstatus = dos_to_ntstatus(eclass, ecode);
  99                 }
 100                 SIVAL(outbuf,smb_rcls,NT_STATUS_V(ntstatus));
 101                 SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)|FLAGS2_32_BIT_ERROR_CODES);
 102                 DEBUG(3,("error packet at %s(%d) cmd=%d (%s) %s\n",
 103                          file, line,
 104                          (int)CVAL(outbuf,smb_com),
 105                          smb_fn_name(CVAL(outbuf,smb_com)),
 106                          nt_errstr(ntstatus)));
 107         } else {
 108                 /* We're returning a DOS error only. */
 109                 if (NT_STATUS_IS_DOS(ntstatus)) {
 110                         eclass = NT_STATUS_DOS_CLASS(ntstatus);
 111                         ecode = NT_STATUS_DOS_CODE(ntstatus);
 112                 } else  if (eclass == 0 && NT_STATUS_V(ntstatus)) {
 113                         ntstatus_to_dos(ntstatus, &eclass, &ecode);
 114                 }
 115
 116                 SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)&~FLAGS2_32_BIT_ERROR_CODES);
 117                 SSVAL(outbuf,smb_rcls,eclass);
 118                 SSVAL(outbuf,smb_err,ecode);
 119
 120                 DEBUG(3,("error packet at %s(%d) cmd=%d (%s) eclass=%d ecode=%d\n",
 121                           file, line,
 122                           (int)CVAL(outbuf,smb_com),
 123                           smb_fn_name(CVAL(outbuf,smb_com)),
 124                           eclass,
 125                           ecode));
 126         }
 127 }
 128
 129 int error_packet(char *outbuf, uint8 eclass, uint32 ecode, NTSTATUS ntstatus, int line, const char *file)
 130 {
 131         int outsize = set_message(outbuf,0,0,True);
 132         error_packet_set(outbuf, eclass, ecode, ntstatus, line, file);
 133         return outsize;
 134 }
 135
 136 /*******************************************************************************
 137  Special error map processing needed for returning DOS errors on open calls.
 138 *******************************************************************************/
 139
 140 int error_open(char *outbuf, NTSTATUS status, int line, const char *file)
 141 {
 142         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_COLLISION)) {
 143                 /*
 144                  * We hit an existing file, and if we're returning DOS
 145                  * error codes OBJECT_NAME_COLLISION would map to
 146                  * ERRDOS/183, we need to return ERRDOS/80, see bug
 147                  * 4852.
 148                  */
 149                 return error_packet(outbuf, ERRDOS, ERRfilexists,
 150                                 NT_STATUS_OBJECT_NAME_COLLISION, line, file);
 151         }
 152         return error_packet(outbuf,0,0,status,line,file);
 153 }