source/libsmb/clitrans.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    client transaction calls
   5    Copyright (C) Andrew Tridgell 1994-1998
   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 #define NO_SYSLOG
  23
  24 #include "includes.h"
  25
  26
  27 /****************************************************************************
  28   send a SMB trans or trans2 request
  29   ****************************************************************************/
  30 BOOL cli_send_trans(struct cli_state *cli, int trans,
  31                     char *name, int pipe_name_len,
  32                     int fid, int flags,
  33                     uint16 *setup, int lsetup, int msetup,
  34                     char *param, int lparam, int mparam,
  35                     char *data, int ldata, int mdata)
  36 {
  37         int i;
  38         int this_ldata,this_lparam;
  39         int tot_data=0,tot_param=0;
  40         char *outdata,*outparam;
  41         char *p;
  42
  43         this_lparam = MIN(lparam,cli->max_xmit - (500+lsetup*2)); /* hack */
  44         this_ldata = MIN(ldata,cli->max_xmit - (500+lsetup*2+this_lparam));
  45
  46         memset(cli->outbuf,'\0',smb_size);
  47         set_message(cli->outbuf,14+lsetup,0,True);
  48         CVAL(cli->outbuf,smb_com) = trans;
  49         SSVAL(cli->outbuf,smb_tid, cli->cnum);
  50         cli_setup_packet(cli);
  51
  52         outparam = smb_buf(cli->outbuf)+(trans==SMBtrans ? pipe_name_len+1 : 3);
  53         outdata = outparam+this_lparam;
  54
  55         /* primary request */
  56         SSVAL(cli->outbuf,smb_tpscnt,lparam);   /* tpscnt */
  57         SSVAL(cli->outbuf,smb_tdscnt,ldata);    /* tdscnt */
  58         SSVAL(cli->outbuf,smb_mprcnt,mparam);   /* mprcnt */
  59         SSVAL(cli->outbuf,smb_mdrcnt,mdata);    /* mdrcnt */
  60         SCVAL(cli->outbuf,smb_msrcnt,msetup);   /* msrcnt */
  61         SSVAL(cli->outbuf,smb_flags,flags);     /* flags */
  62         SIVAL(cli->outbuf,smb_timeout,0);               /* timeout */
  63         SSVAL(cli->outbuf,smb_pscnt,this_lparam);       /* pscnt */
  64         SSVAL(cli->outbuf,smb_psoff,smb_offset(outparam,cli->outbuf)); /* psoff */
  65         SSVAL(cli->outbuf,smb_dscnt,this_ldata);        /* dscnt */
  66         SSVAL(cli->outbuf,smb_dsoff,smb_offset(outdata,cli->outbuf)); /* dsoff */
  67         SCVAL(cli->outbuf,smb_suwcnt,lsetup);   /* suwcnt */
  68         for (i=0;i<lsetup;i++)          /* setup[] */
  69                 SSVAL(cli->outbuf,smb_setup+i*2,setup[i]);
  70         p = smb_buf(cli->outbuf);
  71         if (trans==SMBtrans) {
  72                 memcpy(p,name, pipe_name_len + 1);  /* name[] */
  73         } else {
  74                 *p++ = 0;  /* put in a null smb_name */
  75                 *p++ = 'D'; *p++ = ' '; /* observed in OS/2 */
  76         }
  77         if (this_lparam)                        /* param[] */
  78                 memcpy(outparam,param,this_lparam);
  79         if (this_ldata)                 /* data[] */
  80                 memcpy(outdata,data,this_ldata);
  81         set_message(cli->outbuf,14+lsetup,              /* wcnt, bcc */
  82                     PTR_DIFF(outdata+this_ldata,smb_buf(cli->outbuf)),False);
  83
  84         show_msg(cli->outbuf);
  85         cli_send_smb(cli);
  86
  87         if (this_ldata < ldata || this_lparam < lparam) {
  88                 /* receive interim response */
  89                 if (!cli_receive_smb(cli) ||
  90                     CVAL(cli->inbuf,smb_rcls) != 0) {
  91                         return(False);
  92                 }
  93
  94                 tot_data = this_ldata;
  95                 tot_param = this_lparam;
  96
  97                 while (tot_data < ldata || tot_param < lparam)  {
  98                         this_lparam = MIN(lparam-tot_param,cli->max_xmit - 500); /* hack */
  99                         this_ldata = MIN(ldata-tot_data,cli->max_xmit - (500+this_lparam));
 100
 101                         set_message(cli->outbuf,trans==SMBtrans?8:9,0,True);
 102                         CVAL(cli->outbuf,smb_com) = trans==SMBtrans ? SMBtranss : SMBtranss2;
 103
 104                         outparam = smb_buf(cli->outbuf);
 105                         outdata = outparam+this_lparam;
 106
 107                         /* secondary request */
 108                         SSVAL(cli->outbuf,smb_tpscnt,lparam);   /* tpscnt */
 109                         SSVAL(cli->outbuf,smb_tdscnt,ldata);    /* tdscnt */
 110                         SSVAL(cli->outbuf,smb_spscnt,this_lparam);      /* pscnt */
 111                         SSVAL(cli->outbuf,smb_spsoff,smb_offset(outparam,cli->outbuf)); /* psoff */
 112                         SSVAL(cli->outbuf,smb_spsdisp,tot_param);       /* psdisp */
 113                         SSVAL(cli->outbuf,smb_sdscnt,this_ldata);       /* dscnt */
 114                         SSVAL(cli->outbuf,smb_sdsoff,smb_offset(outdata,cli->outbuf)); /* dsoff */
 115                         SSVAL(cli->outbuf,smb_sdsdisp,tot_data);        /* dsdisp */
 116                         if (trans==SMBtrans2)
 117                                 SSVALS(cli->outbuf,smb_sfid,fid);               /* fid */
 118                         if (this_lparam)                        /* param[] */
 119                                 memcpy(outparam,param+tot_param,this_lparam);
 120                         if (this_ldata)                 /* data[] */
 121                                 memcpy(outdata,data+tot_data,this_ldata);
 122                         set_message(cli->outbuf,trans==SMBtrans?8:9, /* wcnt, bcc */
 123                                     PTR_DIFF(outdata+this_ldata,smb_buf(cli->outbuf)),False);
 124
 125                         show_msg(cli->outbuf);
 126                         cli_send_smb(cli);
 127
 128                         tot_data += this_ldata;
 129                         tot_param += this_lparam;
 130                 }
 131         }
 132
 133         return(True);
 134 }
 135
 136
 137 /****************************************************************************
 138   receive a SMB trans or trans2 response allocating the necessary memory
 139   ****************************************************************************/
 140 BOOL cli_receive_trans(struct cli_state *cli,int trans,
 141                               char **param, int *param_len,
 142                               char **data, int *data_len)
 143 {
 144         int total_data=0;
 145         int total_param=0;
 146         int this_data,this_param;
 147         uint8 eclass;
 148         uint32 ecode;
 149
 150         *data_len = *param_len = 0;
 151
 152         if (!cli_receive_smb(cli))
 153                 return False;
 154
 155         show_msg(cli->inbuf);
 156
 157         /* sanity check */
 158         if (CVAL(cli->inbuf,smb_com) != trans) {
 159                 DEBUG(0,("Expected %s response, got command 0x%02x\n",
 160                          trans==SMBtrans?"SMBtrans":"SMBtrans2",
 161                          CVAL(cli->inbuf,smb_com)));
 162                 return(False);
 163         }
 164
 165         /*
 166          * An NT RPC pipe call can return ERRDOS, ERRmoredata
 167          * to a trans call. This is not an error and should not
 168          * be treated as such.
 169          */
 170
 171         if (cli_error(cli, &eclass, &ecode, NULL))
 172         {
 173         if(cli->nt_pipe_fnum == 0 || !(eclass == ERRDOS && ecode == ERRmoredata))
 174                         return(False);
 175         }
 176
 177         /* parse out the lengths */
 178         total_data = SVAL(cli->inbuf,smb_tdrcnt);
 179         total_param = SVAL(cli->inbuf,smb_tprcnt);
 180
 181         /* allocate it */
 182         *data = Realloc(*data,total_data);
 183         *param = Realloc(*param,total_param);
 184
 185         while (1)  {
 186                 this_data = SVAL(cli->inbuf,smb_drcnt);
 187                 this_param = SVAL(cli->inbuf,smb_prcnt);
 188
 189                 if (this_data + *data_len > total_data ||
 190                     this_param + *param_len > total_param) {
 191                         DEBUG(1,("Data overflow in cli_receive_trans\n"));
 192                         return False;
 193                 }
 194
 195                 if (this_data)
 196                         memcpy(*data + SVAL(cli->inbuf,smb_drdisp),
 197                                smb_base(cli->inbuf) + SVAL(cli->inbuf,smb_droff),
 198                                this_data);
 199                 if (this_param)
 200                         memcpy(*param + SVAL(cli->inbuf,smb_prdisp),
 201                                smb_base(cli->inbuf) + SVAL(cli->inbuf,smb_proff),
 202                                this_param);
 203                 *data_len += this_data;
 204                 *param_len += this_param;
 205
 206                 /* parse out the total lengths again - they can shrink! */
 207                 total_data = SVAL(cli->inbuf,smb_tdrcnt);
 208                 total_param = SVAL(cli->inbuf,smb_tprcnt);
 209
 210                 if (total_data <= *data_len && total_param <= *param_len)
 211                         break;
 212
 213                 if (!cli_receive_smb(cli))
 214                         return False;
 215
 216                 show_msg(cli->inbuf);
 217
 218                 /* sanity check */
 219                 if (CVAL(cli->inbuf,smb_com) != trans) {
 220                         DEBUG(0,("Expected %s response, got command 0x%02x\n",
 221                                  trans==SMBtrans?"SMBtrans":"SMBtrans2",
 222                                  CVAL(cli->inbuf,smb_com)));
 223                         return(False);
 224                 }
 225                 if (cli_error(cli, &eclass, &ecode, NULL))
 226                 {
 227                 if(cli->nt_pipe_fnum == 0 || !(eclass == ERRDOS && ecode == ERRmoredata))
 228                                 return(False);
 229                 }
 230         }
 231
 232         return(True);
 233 }