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