source3/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  Create an error packet from a cached error.
  33 ****************************************************************************/
  34
  35 int cached_error_packet(char *outbuf,files_struct *fsp,int line,const char *file)
  36 {
  37         write_bmpx_struct *wbmpx = fsp->wbmpx_ptr;
  38
  39         int32 eclass = wbmpx->wr_errclass;
  40         int32 err = wbmpx->wr_error;
  41
  42         /* We can now delete the auxiliary struct */
  43         free((char *)wbmpx);
  44         fsp->wbmpx_ptr = NULL;
  45         return error_packet(outbuf,NT_STATUS_OK,eclass,err,line,file);
  46 }
  47
  48 /****************************************************************************
  49  Create an error packet from errno.
  50 ****************************************************************************/
  51
  52 int unix_error_packet(char *outbuf,int def_class,uint32 def_code,
  53                       int line, const char *file)
  54 {
  55         int eclass=def_class;
  56         int ecode=def_code;
  57         NTSTATUS ntstatus = NT_STATUS_OK;
  58         int i=0;
  59
  60         if (unix_ERR_class != SMB_SUCCESS) {
  61                 eclass = unix_ERR_class;
  62                 ecode = unix_ERR_code;
  63                 ntstatus = unix_ERR_ntstatus;
  64         } else {
  65                 while (unix_dos_nt_errmap[i].dos_class != 0) {
  66                         if (unix_dos_nt_errmap[i].unix_error == errno) {
  67                                 eclass = unix_dos_nt_errmap[i].dos_class;
  68                                 ecode = unix_dos_nt_errmap[i].dos_code;
  69                                 ntstatus = unix_dos_nt_errmap[i].nt_error;
  70                                 break;
  71                         }
  72                         i++;
  73                 }
  74         }
  75
  76         return error_packet(outbuf,ntstatus,eclass,ecode,line,file);
  77 }
  78
  79
  80 /****************************************************************************
  81  Create an error packet. Normally called using the ERROR() macro.
  82 ****************************************************************************/
  83
  84 int error_packet(char *outbuf,NTSTATUS ntstatus,
  85                  uint8 eclass,uint32 ecode,int line, const char *file)
  86 {
  87         int outsize = set_message(outbuf,0,0,True);
  88         extern uint32 global_client_caps;
  89
  90         if (errno != 0)
  91                 DEBUG(3,("error string = %s\n",strerror(errno)));
  92
  93         unix_ERR_class = SMB_SUCCESS;
  94         unix_ERR_code = 0;
  95         unix_ERR_ntstatus = NT_STATUS_OK;
  96
  97         /*
  98          * We can explicitly force 32 bit error codes even when the
  99          * parameter "nt status" is set to no by pre-setting the
 100          * FLAGS2_32_BIT_ERROR_CODES bit in the smb_flg2 outbuf.
 101          * This is to allow work arounds for client bugs that are needed
 102          * when talking with clients that normally expect nt status codes. JRA.
 103          */
 104
 105         if ((lp_nt_status_support() || (SVAL(outbuf,smb_flg2) & FLAGS2_32_BIT_ERROR_CODES)) && (global_client_caps & CAP_STATUS32)) {
 106                 if (NT_STATUS_V(ntstatus) == 0 && eclass)
 107                         ntstatus = dos_to_ntstatus(eclass, ecode);
 108                 SIVAL(outbuf,smb_rcls,NT_STATUS_V(ntstatus));
 109                 SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)|FLAGS2_32_BIT_ERROR_CODES);
 110                 DEBUG(3,("error packet at %s(%d) cmd=%d (%s) %s\n",
 111                          file, line,
 112                          (int)CVAL(outbuf,smb_com),
 113                          smb_fn_name(CVAL(outbuf,smb_com)),
 114                          nt_errstr(ntstatus)));
 115                 return outsize;
 116         }
 117
 118         if (eclass == 0 && NT_STATUS_V(ntstatus))
 119                 ntstatus_to_dos(ntstatus, &eclass, &ecode);
 120
 121         SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)&~FLAGS2_32_BIT_ERROR_CODES);
 122         SSVAL(outbuf,smb_rcls,eclass);
 123         SSVAL(outbuf,smb_err,ecode);
 124
 125         DEBUG(3,("error packet at %s(%d) cmd=%d (%s) eclass=%d ecode=%d\n",
 126                   file, line,
 127                   (int)CVAL(outbuf,smb_com),
 128                   smb_fn_name(CVAL(outbuf,smb_com)),
 129                   eclass,
 130                   ecode));
 131
 132         return outsize;
 133 }