source/smbd/ipc.c

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