source/smbd/ipc.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Inter-process communication and named pipe handling
   5    Copyright (C) Andrew Tridgell 1992-1998
   6
   7    SMB Version handling
   8    Copyright (C) John H Terpstra 1995-1998
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23    */
  24 /*
  25    This file handles the named pipe and mailslot calls
  26    in the SMBtrans protocol
  27    */
  28
  29 #include "includes.h"
  30
  31 extern int DEBUGLEVEL;
  32 extern int max_send;
  33
  34 extern fstring local_machine;
  35
  36 #define NERR_notsupported 50
  37
  38 extern int smb_read_error;
  39 extern uint32 global_client_caps;
  40
  41 /*******************************************************************
  42  copies parameters and data, as needed, into the smb buffer
  43
  44  *both* the data and params sections should be aligned.  this
  45  is fudged in the rpc pipes by
  46  at present, only the data section is.  this may be a possible
  47  cause of some of the ipc problems being experienced.  lkcl26dec97
  48
  49  ******************************************************************/
  50
  51 static void copy_trans_params_and_data(char *outbuf, int align,
  52                                 char *rparam, int param_offset, int param_len,
  53                                 char *rdata, int data_offset, int data_len)
  54 {
  55         char *copy_into = smb_buf(outbuf)+1;
  56
  57         if(param_len < 0)
  58                 param_len = 0;
  59
  60         if(data_len < 0)
  61                 data_len = 0;
  62
  63         DEBUG(5,("copy_trans_params_and_data: params[%d..%d] data[%d..%d]\n",
  64                         param_offset, param_offset + param_len,
  65                         data_offset , data_offset  + data_len));
  66
  67         if (param_len)
  68                 memcpy(copy_into, &rparam[param_offset], param_len);
  69
  70         copy_into += param_len + align;
  71
  72         if (data_len )
  73                 memcpy(copy_into, &rdata[data_offset], data_len);
  74 }
  75
  76 /****************************************************************************
  77  Send a trans reply.
  78  ****************************************************************************/
  79
  80 void send_trans_reply(char *outbuf,
  81                                 char *rparam, int rparam_len,
  82                                 char *rdata, int rdata_len,
  83                                 BOOL buffer_too_large)
  84 {
  85         int this_ldata,this_lparam;
  86         int tot_data_sent = 0;
  87         int tot_param_sent = 0;
  88         int align;
  89
  90         int ldata  = rdata  ? rdata_len : 0;
  91         int lparam = rparam ? rparam_len : 0;
  92
  93         if (buffer_too_large)
  94                 DEBUG(5,("send_trans_reply: buffer %d too large\n", ldata ));
  95
  96         this_lparam = MIN(lparam,max_send - 500); /* hack */
  97         this_ldata  = MIN(ldata,max_send - (500+this_lparam));
  98
  99         align = ((this_lparam)%4);
 100
 101         set_message(outbuf,10,1+align+this_ldata+this_lparam,True);
 102
 103         if (buffer_too_large)
 104         {
 105                 /* issue a buffer size warning.  on a DCE/RPC pipe, expect an SMBreadX... */
 106                 if (!(global_client_caps & (CAP_NT_SMBS | CAP_STATUS32 ))) {
 107                         /* Win9x version. */
 108                         SSVAL(outbuf, smb_err, ERRmoredata);
 109                         SCVAL(outbuf, smb_rcls, ERRDOS);
 110                 } else {
 111                         SIVAL(outbuf, smb_flg2, SVAL(outbuf, smb_flg2) | FLAGS2_32_BIT_ERROR_CODES);
 112                         SIVAL(outbuf, smb_rcls, 0x80000000 | STATUS_BUFFER_OVERFLOW);
 113                 }
 114         }
 115
 116         copy_trans_params_and_data(outbuf, align,
 117                                                                 rparam, tot_param_sent, this_lparam,
 118                                                                 rdata, tot_data_sent, this_ldata);
 119
 120         SSVAL(outbuf,smb_vwv0,lparam);
 121         SSVAL(outbuf,smb_vwv1,ldata);
 122         SSVAL(outbuf,smb_vwv3,this_lparam);
 123         SSVAL(outbuf,smb_vwv4,smb_offset(smb_buf(outbuf)+1,outbuf));
 124         SSVAL(outbuf,smb_vwv5,0);
 125         SSVAL(outbuf,smb_vwv6,this_ldata);
 126         SSVAL(outbuf,smb_vwv7,smb_offset(smb_buf(outbuf)+1+this_lparam+align,outbuf));
 127         SSVAL(outbuf,smb_vwv8,0);
 128         SSVAL(outbuf,smb_vwv9,0);
 129
 130         show_msg(outbuf);
 131         if (!send_smb(smbd_server_fd(),outbuf))
 132                 exit_server("send_trans_reply: send_smb failed.\n");
 133
 134         tot_data_sent = this_ldata;
 135         tot_param_sent = this_lparam;
 136
 137         while (tot_data_sent < ldata || tot_param_sent < lparam)
 138         {
 139                 this_lparam = MIN(lparam-tot_param_sent, max_send - 500); /* hack */
 140                 this_ldata  = MIN(ldata -tot_data_sent, max_send - (500+this_lparam));
 141
 142                 if(this_lparam < 0)
 143                         this_lparam = 0;
 144
 145                 if(this_ldata < 0)
 146                         this_ldata = 0;
 147
 148                 align = (this_lparam%4);
 149
 150                 set_message(outbuf,10,1+this_ldata+this_lparam+align,False);
 151
 152                 copy_trans_params_and_data(outbuf, align,
 153                                                                         rparam, tot_param_sent, this_lparam,
 154                                                                         rdata, tot_data_sent, this_ldata);
 155
 156                 SSVAL(outbuf,smb_vwv3,this_lparam);
 157                 SSVAL(outbuf,smb_vwv4,smb_offset(smb_buf(outbuf)+1,outbuf));
 158                 SSVAL(outbuf,smb_vwv5,tot_param_sent);
 159                 SSVAL(outbuf,smb_vwv6,this_ldata);
 160                 SSVAL(outbuf,smb_vwv7,smb_offset(smb_buf(outbuf)+1+this_lparam+align,outbuf));
 161                 SSVAL(outbuf,smb_vwv8,tot_data_sent);
 162                 SSVAL(outbuf,smb_vwv9,0);
 163
 164                 show_msg(outbuf);
 165                 if (!send_smb(smbd_server_fd(),outbuf))
 166                         exit_server("send_trans_reply: send_smb failed.\n");
 167
 168                 tot_data_sent  += this_ldata;
 169                 tot_param_sent += this_lparam;
 170         }
 171 }
 172
 173 /****************************************************************************
 174  Start the first part of an RPC reply which began with an SMBtrans request.
 175 ****************************************************************************/
 176
 177 static BOOL api_rpc_trans_reply(char *outbuf, pipes_struct *p)
 178 {
 179         char *rdata = malloc(p->max_trans_reply);
 180         int data_len;
 181
 182         if(rdata == NULL) {
 183                 DEBUG(0,("api_rpc_trans_reply: malloc fail.\n"));
 184                 return False;
 185         }
 186
 187         if((data_len = read_from_pipe( p, rdata, p->max_trans_reply)) < 0) {
 188                 free(rdata);
 189                 return False;
 190         }
 191
 192         send_trans_reply(outbuf, NULL, 0, rdata, data_len, p->out_data.current_pdu_len > data_len);
 193
 194         free(rdata);
 195         return True;
 196 }
 197
 198 /****************************************************************************
 199  WaitNamedPipeHandleState
 200 ****************************************************************************/
 201
 202 static BOOL api_WNPHS(char *outbuf, pipes_struct *p, char *param, int param_len)
 203 {
 204         uint16 priority;
 205
 206         if (!param || param_len < 2)
 207                 return False;
 208
 209         priority = SVAL(param,0);
 210         DEBUG(4,("WaitNamedPipeHandleState priority %x\n", priority));
 211
 212         if (wait_rpc_pipe_hnd_state(p, priority)) {
 213                 /* now send the reply */
 214                 send_trans_reply(outbuf, NULL, 0, NULL, 0, False);
 215                 return True;
 216         }
 217         return False;
 218 }
 219
 220
 221 /****************************************************************************
 222  SetNamedPipeHandleState
 223 ****************************************************************************/
 224
 225 static BOOL api_SNPHS(char *outbuf, pipes_struct *p, char *param, int param_len)
 226 {
 227         uint16 id;
 228
 229         if (!param || param_len < 2)
 230                 return False;
 231
 232         id = SVAL(param,0);
 233         DEBUG(4,("SetNamedPipeHandleState to code %x\n", id));
 234
 235         if (set_rpc_pipe_hnd_state(p, id)) {
 236                 /* now send the reply */
 237                 send_trans_reply(outbuf, NULL, 0, NULL, 0, False);
 238                 return True;
 239         }
 240         return False;
 241 }
 242
 243
 244 /****************************************************************************
 245  When no reply is generated, indicate unsupported.
 246  ****************************************************************************/
 247
 248 static BOOL api_no_reply(char *outbuf, int max_rdata_len)
 249 {
 250         char rparam[4];
 251
 252         /* unsupported */
 253         SSVAL(rparam,0,NERR_notsupported);
 254         SSVAL(rparam,2,0); /* converter word */
 255
 256         DEBUG(3,("Unsupported API fd command\n"));
 257
 258         /* now send the reply */
 259         send_trans_reply(outbuf, rparam, 4, NULL, 0, False);
 260
 261         return -1;
 262 }
 263
 264 /****************************************************************************
 265  Handle remote api calls delivered to a named pipe already opened.
 266  ****************************************************************************/
 267
 268 static int api_fd_reply(connection_struct *conn,uint16 vuid,char *outbuf,
 269                         uint16 *setup,char *data,char *params,
 270                         int suwcnt,int tdscnt,int tpscnt,int mdrcnt,int mprcnt)
 271 {
 272         BOOL reply = False;
 273         pipes_struct *p = NULL;
 274         int pnum;
 275         int subcommand;
 276
 277         DEBUG(5,("api_fd_reply\n"));
 278
 279         /* First find out the name of this file. */
 280         if (suwcnt != 2) {
 281                 DEBUG(0,("Unexpected named pipe transaction.\n"));
 282                 return(-1);
 283         }
 284
 285         /* Get the file handle and hence the file name. */
 286         /*
 287          * NB. The setup array has already been transformed
 288          * via SVAL and so is in gost byte order.
 289          */
 290         pnum = ((int)setup[1]) & 0xFFFF;
 291         subcommand = ((int)setup[0]) & 0xFFFF;
 292
 293         if(!(p = get_rpc_pipe(pnum))) {
 294                 DEBUG(1,("api_fd_reply: INVALID PIPE HANDLE: %x\n", pnum));
 295                 return api_no_reply(outbuf, mdrcnt);
 296         }
 297
 298         DEBUG(3,("Got API command 0x%x on pipe \"%s\" (pnum %x)", subcommand, p->name, pnum));
 299
 300         /* record maximum data length that can be transmitted in an SMBtrans */
 301         p->max_trans_reply = mdrcnt;
 302
 303         DEBUG(10,("api_fd_reply: p:%p max_trans_reply: %d\n", p, p->max_trans_reply));
 304
 305         switch (subcommand) {
 306         case 0x26:
 307                 /* dce/rpc command */
 308                 reply = write_to_pipe(p, data, tdscnt);
 309                 if (reply)
 310                         reply = api_rpc_trans_reply(outbuf, p);
 311                 break;
 312         case 0x53:
 313                 /* Wait Named Pipe Handle state */
 314                 reply = api_WNPHS(outbuf, p, params, tpscnt);
 315                 break;
 316         case 0x01:
 317                 /* Set Named Pipe Handle state */
 318                 reply = api_SNPHS(outbuf, p, params, tpscnt);
 319                 break;
 320         }
 321
 322         if (!reply)
 323                 return api_no_reply(outbuf, mdrcnt);
 324
 325         return -1;
 326 }
 327
 328 /****************************************************************************
 329   handle named pipe commands
 330   ****************************************************************************/
 331 static int named_pipe(connection_struct *conn,uint16 vuid, char *outbuf,char *name,
 332                       uint16 *setup,char *data,char *params,
 333                       int suwcnt,int tdscnt,int tpscnt,
 334                       int msrcnt,int mdrcnt,int mprcnt)
 335 {
 336         DEBUG(3,("named pipe command on <%s> name\n", name));
 337
 338         if (strequal(name,"LANMAN"))
 339                 return api_reply(conn,vuid,outbuf,data,params,tdscnt,tpscnt,mdrcnt,mprcnt);
 340
 341         if (strequal(name,"WKSSVC") ||
 342             strequal(name,"SRVSVC") ||
 343             strequal(name,"WINREG") ||
 344             strequal(name,"SAMR") ||
 345             strequal(name,"LSARPC"))
 346         {
 347                 DEBUG(4,("named pipe command from Win95 (wow!)\n"));
 348                 return api_fd_reply(conn,vuid,outbuf,setup,data,params,suwcnt,tdscnt,tpscnt,mdrcnt,mprcnt);
 349         }
 350
 351         if (strlen(name) < 1)
 352                 return api_fd_reply(conn,vuid,outbuf,setup,data,params,suwcnt,tdscnt,tpscnt,mdrcnt,mprcnt);
 353
 354         if (setup)
 355                 DEBUG(3,("unknown named pipe: setup 0x%X setup1=%d\n", (int)setup[0],(int)setup[1]));
 356
 357         return 0;
 358 }
 359
 360
 361 /****************************************************************************
 362  Reply to a SMBtrans.
 363  ****************************************************************************/
 364
 365 int reply_trans(connection_struct *conn, char *inbuf,char *outbuf, int size, int bufsize)
 366 {
 367         fstring name;
 368         int name_offset = 0;
 369         char *data=NULL,*params=NULL;
 370         uint16 *setup=NULL;
 371         int outsize = 0;
 372         uint16 vuid = SVAL(inbuf,smb_uid);
 373         int tpscnt = SVAL(inbuf,smb_vwv0);
 374         int tdscnt = SVAL(inbuf,smb_vwv1);
 375         int mprcnt = SVAL(inbuf,smb_vwv2);
 376         int mdrcnt = SVAL(inbuf,smb_vwv3);
 377         int msrcnt = CVAL(inbuf,smb_vwv4);
 378         BOOL close_on_completion = BITSETW(inbuf+smb_vwv5,0);
 379         BOOL one_way = BITSETW(inbuf+smb_vwv5,1);
 380         int pscnt = SVAL(inbuf,smb_vwv9);
 381         int psoff = SVAL(inbuf,smb_vwv10);
 382         int dscnt = SVAL(inbuf,smb_vwv11);
 383         int dsoff = SVAL(inbuf,smb_vwv12);
 384         int suwcnt = CVAL(inbuf,smb_vwv13);
 385         START_PROFILE(SMBtrans);
 386
 387         memset(name, '\0',sizeof(name));
 388         srvstr_pull(inbuf, name, smb_buf(inbuf), sizeof(name), -1, STR_TERMINATE|STR_CONVERT);
 389
 390         if (dscnt > tdscnt || pscnt > tpscnt) {
 391                 exit_server("invalid trans parameters\n");
 392         }
 393
 394         if (tdscnt)  {
 395                 if((data = (char *)malloc(tdscnt)) == NULL) {
 396                         DEBUG(0,("reply_trans: data malloc fail for %d bytes !\n", tdscnt));
 397                         END_PROFILE(SMBtrans);
 398                         return(ERROR(ERRDOS,ERRnomem));
 399                 }
 400                 memcpy(data,smb_base(inbuf)+dsoff,dscnt);
 401         }
 402
 403         if (tpscnt) {
 404                 if((params = (char *)malloc(tpscnt)) == NULL) {
 405                         DEBUG(0,("reply_trans: param malloc fail for %d bytes !\n", tpscnt));
 406                         END_PROFILE(SMBtrans);
 407                         return(ERROR(ERRDOS,ERRnomem));
 408                 }
 409                 memcpy(params,smb_base(inbuf)+psoff,pscnt);
 410         }
 411
 412         if (suwcnt) {
 413                 int i;
 414                 if((setup = (uint16 *)malloc(suwcnt*sizeof(uint16))) == NULL) {
 415           DEBUG(0,("reply_trans: setup malloc fail for %d bytes !\n", (int)(suwcnt * sizeof(uint16))));
 416                   END_PROFILE(SMBtrans);
 417                   return(ERROR(ERRDOS,ERRnomem));
 418         }
 419                 for (i=0;i<suwcnt;i++)
 420                         setup[i] = SVAL(inbuf,smb_vwv14+i*SIZEOFWORD);
 421         }
 422
 423
 424         if (pscnt < tpscnt || dscnt < tdscnt) {
 425                 /* We need to send an interim response then receive the rest
 426                    of the parameter/data bytes */
 427                 outsize = set_message(outbuf,0,0,True);
 428                 show_msg(outbuf);
 429                 if (!send_smb(smbd_server_fd(),outbuf))
 430                         exit_server("reply_trans: send_smb failed.\n");
 431         }
 432
 433         /* receive the rest of the trans packet */
 434         while (pscnt < tpscnt || dscnt < tdscnt) {
 435                 BOOL ret;
 436                 int pcnt,poff,dcnt,doff,pdisp,ddisp;
 437
 438                 ret = receive_next_smb(inbuf,bufsize,SMB_SECONDARY_WAIT);
 439
 440                 if ((ret && (CVAL(inbuf, smb_com) != SMBtranss)) || !ret) {
 441                         if(ret) {
 442                                 DEBUG(0,("reply_trans: Invalid secondary trans packet\n"));
 443                         } else {
 444                                 DEBUG(0,("reply_trans: %s in getting secondary trans response.\n",
 445                                          (smb_read_error == READ_ERROR) ? "error" : "timeout" ));
 446                         }
 447                         if (params)
 448                                 free(params);
 449                         if (data)
 450                                 free(data);
 451                         if (setup)
 452                                 free(setup);
 453                         END_PROFILE(SMBtrans);
 454                         return(ERROR(ERRSRV,ERRerror));
 455                 }
 456
 457                 show_msg(inbuf);
 458
 459                 tpscnt = SVAL(inbuf,smb_vwv0);
 460                 tdscnt = SVAL(inbuf,smb_vwv1);
 461
 462                 pcnt = SVAL(inbuf,smb_vwv2);
 463                 poff = SVAL(inbuf,smb_vwv3);
 464                 pdisp = SVAL(inbuf,smb_vwv4);
 465
 466                 dcnt = SVAL(inbuf,smb_vwv5);
 467                 doff = SVAL(inbuf,smb_vwv6);
 468                 ddisp = SVAL(inbuf,smb_vwv7);
 469
 470                 pscnt += pcnt;
 471                 dscnt += dcnt;
 472
 473                 if (dscnt > tdscnt || pscnt > tpscnt) {
 474                         exit_server("invalid trans parameters\n");
 475                 }
 476
 477                 if (pcnt)
 478                         memcpy(params+pdisp,smb_base(inbuf)+poff,pcnt);
 479                 if (dcnt)
 480                         memcpy(data+ddisp,smb_base(inbuf)+doff,dcnt);
 481         }
 482
 483
 484         DEBUG(3,("trans <%s> data=%d params=%d setup=%d\n",
 485                  name,tdscnt,tpscnt,suwcnt));
 486
 487         /*
 488          * WinCE wierdness....
 489          */
 490
 491         if (name[0] == '\\' && (StrnCaseCmp(&name[1],local_machine, strlen(local_machine)) == 0) &&
 492                         (name[strlen(local_machine)+1] == '\\'))
 493                 name_offset = strlen(local_machine)+1;
 494
 495         if (strnequal(&name[name_offset], "\\PIPE", strlen("\\PIPE"))) {
 496                 name_offset += strlen("\\PIPE");
 497
 498                 /* Win9x weirdness.  When talking to a unicode server Win9x
 499                    only sends \PIPE instead of \PIPE\ */
 500
 501                 if (name[name_offset] == '\\')
 502                         name_offset++;
 503
 504                 DEBUG(5,("calling named_pipe\n"));
 505                 outsize = named_pipe(conn,vuid,outbuf,
 506                                      name+name_offset,setup,data,params,
 507                                      suwcnt,tdscnt,tpscnt,msrcnt,mdrcnt,mprcnt);
 508         } else {
 509                 DEBUG(3,("invalid pipe name\n"));
 510                 outsize = 0;
 511         }
 512
 513
 514         if (data)
 515                 free(data);
 516         if (params)
 517                 free(params);
 518         if (setup)
 519                 free(setup);
 520
 521         if (close_on_completion)
 522                 close_cnum(conn,vuid);
 523
 524         if (one_way) {
 525                 END_PROFILE(SMBtrans);
 526                 return(-1);
 527         }
 528
 529         if (outsize == 0) {
 530                 END_PROFILE(SMBtrans);
 531                 return(ERROR(ERRSRV,ERRnosupport));
 532         }
 533
 534         END_PROFILE(SMBtrans);
 535         return(outsize);
 536 }