source/smbd/error.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    error packet handling
   5    Copyright (C) Andrew Tridgell 1992-1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 /* these can be set by some functions to override the error codes */
  25 int unix_ERR_class=SMB_SUCCESS;
  26 int unix_ERR_code=0;
  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         SAFE_FREE(wbmpx);
  44         return error_packet(outbuf,NT_STATUS_OK,eclass,err,line,file);
  45 }
  46
  47 /****************************************************************************
  48  Create an error packet from errno.
  49 ****************************************************************************/
  50
  51 int unix_error_packet(char *outbuf,int def_class,uint32 def_code,
  52                       int line, const char *file)
  53 {
  54         int eclass=def_class;
  55         int ecode=def_code;
  56         NTSTATUS ntstatus = NT_STATUS_OK;
  57         int i=0;
  58
  59         if (unix_ERR_class != SMB_SUCCESS) {
  60                 eclass = unix_ERR_class;
  61                 ecode = unix_ERR_code;
  62                 unix_ERR_class = SMB_SUCCESS;
  63                 unix_ERR_code = 0;
  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         /*
  94          * We can explicitly force 32 bit error codes even when the
  95          * parameter "nt status" is set to no by pre-setting the
  96          * FLAGS2_32_BIT_ERROR_CODES bit in the smb_flg2 outbuf.
  97          * This is to allow work arounds for client bugs that are needed
  98          * when talking with clients that normally expect nt status codes. JRA.
  99          */
 100
 101         if ((lp_nt_status_support() || (SVAL(outbuf,smb_flg2) & FLAGS2_32_BIT_ERROR_CODES)) && (global_client_caps & CAP_STATUS32)) {
 102                 if (NT_STATUS_V(ntstatus) == 0 && eclass)
 103                         ntstatus = dos_to_ntstatus(eclass, ecode);
 104                 SIVAL(outbuf,smb_rcls,NT_STATUS_V(ntstatus));
 105                 SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)|FLAGS2_32_BIT_ERROR_CODES);
 106                 DEBUG(3,("error packet at %s(%d) cmd=%d (%s) %s\n",
 107                          file, line,
 108                          (int)CVAL(outbuf,smb_com),
 109                          smb_fn_name(CVAL(outbuf,smb_com)),
 110                          get_nt_error_msg(ntstatus)));
 111                 return outsize;
 112         }
 113
 114         if (eclass == 0 && NT_STATUS_V(ntstatus))
 115                 ntstatus_to_dos(ntstatus, &eclass, &ecode);
 116
 117         SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)&~FLAGS2_32_BIT_ERROR_CODES);
 118         SSVAL(outbuf,smb_rcls,eclass);
 119         SSVAL(outbuf,smb_err,ecode);
 120
 121         DEBUG(3,("error packet at %s(%d) cmd=%d (%s) eclass=%d ecode=%d\n",
 122                   file, line,
 123                   (int)CVAL(outbuf,smb_com),
 124                   smb_fn_name(CVAL(outbuf,smb_com)),
 125                   eclass,
 126                   ecode));
 127
 128         return outsize;
 129 }