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 /* these can be set by some functions to override the error codes */
  24 int unix_ERR_class=SMB_SUCCESS;
  25 int unix_ERR_code=0;
  26 NTSTATUS unix_ERR_ntstatus = NT_STATUS_OK;
  27
  28 /* From lib/error.c */
  29 extern struct unix_error_map unix_dos_nt_errmap[];
  30
  31 /****************************************************************************
  32  Ensure we don't have any errors cached.
  33 ****************************************************************************/
  34
  35 void clear_cached_errors(void)
  36 {
  37         unix_ERR_class = SMB_SUCCESS;
  38         unix_ERR_code = 0;
  39         unix_ERR_ntstatus = NT_STATUS_OK;
  40 }
  41
  42 /****************************************************************************
  43  Create an error packet from a cached error.
  44 ****************************************************************************/
  45
  46 int cached_error_packet(char *outbuf,files_struct *fsp,int line,const char *file)
  47 {
  48         write_bmpx_struct *wbmpx = fsp->wbmpx_ptr;
  49
  50         int32 eclass = wbmpx->wr_errclass;
  51         int32 err = wbmpx->wr_error;
  52
  53         /* We can now delete the auxiliary struct */
  54         free((char *)wbmpx);
  55         fsp->wbmpx_ptr = NULL;
  56         return error_packet(outbuf,NT_STATUS_OK,eclass,err,False,line,file);
  57 }
  58
  59 /****************************************************************************
  60  Create an error packet from errno.
  61 ****************************************************************************/
  62
  63 int unix_error_packet(char *outbuf,int def_class,uint32 def_code,
  64                       int line, const char *file)
  65 {
  66         int eclass=def_class;
  67         int ecode=def_code;
  68         NTSTATUS ntstatus = NT_STATUS_OK;
  69         int i=0;
  70
  71         if (unix_ERR_class != SMB_SUCCESS) {
  72                 eclass = unix_ERR_class;
  73                 ecode = unix_ERR_code;
  74                 ntstatus = unix_ERR_ntstatus;
  75                 unix_ERR_class = SMB_SUCCESS;
  76                 unix_ERR_code = 0;
  77                 unix_ERR_ntstatus = NT_STATUS_OK;
  78         } else {
  79                 while (unix_dos_nt_errmap[i].dos_class != 0) {
  80                         if (unix_dos_nt_errmap[i].unix_error == errno) {
  81                                 eclass = unix_dos_nt_errmap[i].dos_class;
  82                                 ecode = unix_dos_nt_errmap[i].dos_code;
  83                                 ntstatus = unix_dos_nt_errmap[i].nt_error;
  84                                 break;
  85                         }
  86                         i++;
  87                 }
  88         }
  89
  90         return error_packet(outbuf,ntstatus,eclass,ecode,False,line,file);
  91 }
  92
  93
  94 /****************************************************************************
  95  Create an error packet. Normally called using the ERROR() macro.
  96 ****************************************************************************/
  97
  98 int error_packet(char *outbuf,NTSTATUS ntstatus,
  99                  uint8 eclass,uint32 ecode,BOOL force_dos, int line, const char *file)
 100 {
 101         int outsize = set_message(outbuf,0,0,True);
 102         extern uint32 global_client_caps;
 103
 104         if (errno != 0)
 105                 DEBUG(3,("error string = %s\n",strerror(errno)));
 106
 107 #if defined(DEVELOPER)
 108         if (unix_ERR_class != SMB_SUCCESS || unix_ERR_code != 0 || !NT_STATUS_IS_OK(unix_ERR_ntstatus))
 109                 smb_panic("logic error in error processing");
 110 #endif
 111
 112         /*
 113          * We can explicitly force 32 bit error codes even when the
 114          * parameter "nt status" is set to no by pre-setting the
 115          * FLAGS2_32_BIT_ERROR_CODES bit in the smb_flg2 outbuf.
 116          * This is to allow work arounds for client bugs that are needed
 117          * when talking with clients that normally expect nt status codes. JRA.
 118          */
 119
 120         if ((lp_nt_status_support() || (SVAL(outbuf,smb_flg2) & FLAGS2_32_BIT_ERROR_CODES)) && (global_client_caps & CAP_STATUS32) && (!force_dos)) {
 121                 if (NT_STATUS_V(ntstatus) == 0 && eclass)
 122                         ntstatus = dos_to_ntstatus(eclass, ecode);
 123                 SIVAL(outbuf,smb_rcls,NT_STATUS_V(ntstatus));
 124                 SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)|FLAGS2_32_BIT_ERROR_CODES);
 125                 DEBUG(3,("error packet at %s(%d) cmd=%d (%s) %s\n",
 126                          file, line,
 127                          (int)CVAL(outbuf,smb_com),
 128                          smb_fn_name(CVAL(outbuf,smb_com)),
 129                          nt_errstr(ntstatus)));
 130                 return outsize;
 131         }
 132
 133         if (eclass == 0 && NT_STATUS_V(ntstatus))
 134                 ntstatus_to_dos(ntstatus, &eclass, &ecode);
 135
 136         SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)&~FLAGS2_32_BIT_ERROR_CODES);
 137         SSVAL(outbuf,smb_rcls,eclass);
 138         SSVAL(outbuf,smb_err,ecode);
 139
 140         DEBUG(3,("error packet at %s(%d) cmd=%d (%s) eclass=%d ecode=%d\n",
 141                   file, line,
 142                   (int)CVAL(outbuf,smb_com),
 143                   smb_fn_name(CVAL(outbuf,smb_com)),
 144                   eclass,
 145                   ecode));
 146
 147         return outsize;
 148 }