source3/rpc_server/srv_pipe_hnd.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC Pipe client / server routines
   4  *  Copyright (C) Andrew Tridgell              1992-1998,
   5  *  Largely re-written : 2005
   6  *  Copyright (C) Jeremy Allison                1998 - 2005
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "includes.h"
  23 #include "rpc_server.h"
  24 #include "fake_file.h"
  25 #include "rpc_dce.h"
  26 #include "ntdomain.h"
  27 #include "rpc_server/rpc_ncacn_np.h"
  28 #include "rpc_server/srv_pipe_hnd.h"
  29 #include "rpc_server/srv_pipe.h"
  30 #include "../lib/tsocket/tsocket.h"
  31 #include "../lib/util/tevent_ntstatus.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_RPC_SRV
  35
  36 /****************************************************************************
  37  Ensures we have at least RPC_HEADER_LEN amount of data in the incoming buffer.
  38 ****************************************************************************/
  39
  40 static ssize_t fill_rpc_header(struct pipes_struct *p, const char *data, size_t data_to_copy)
  41 {
  42         size_t len_needed_to_complete_hdr =
  43                 MIN(data_to_copy, RPC_HEADER_LEN - p->in_data.pdu.length);
  44
  45         DEBUG(10, ("fill_rpc_header: data_to_copy = %u, "
  46                    "len_needed_to_complete_hdr = %u, "
  47                    "receive_len = %u\n",
  48                    (unsigned int)data_to_copy,
  49                    (unsigned int)len_needed_to_complete_hdr,
  50                    (unsigned int)p->in_data.pdu.length ));
  51
  52         if (p->in_data.pdu.data == NULL) {
  53                 p->in_data.pdu.data = talloc_array(p, uint8_t, RPC_HEADER_LEN);
  54         }
  55         if (p->in_data.pdu.data == NULL) {
  56                 DEBUG(0, ("talloc failed\n"));
  57                 return -1;
  58         }
  59
  60         memcpy((char *)&p->in_data.pdu.data[p->in_data.pdu.length],
  61                 data, len_needed_to_complete_hdr);
  62         p->in_data.pdu.length += len_needed_to_complete_hdr;
  63
  64         return (ssize_t)len_needed_to_complete_hdr;
  65 }
  66
  67 static bool get_pdu_size(struct pipes_struct *p)
  68 {
  69         uint16_t frag_len;
  70         /* the fill_rpc_header() call insures we copy only
  71          * RPC_HEADER_LEN bytes. If this doesn't match then
  72          * somethign is very wrong and we can only abort */
  73         if (p->in_data.pdu.length != RPC_HEADER_LEN) {
  74                 DEBUG(0, ("Unexpected RPC Header size! "
  75                           "got %d, expected %d)\n",
  76                           (int)p->in_data.pdu.length,
  77                           RPC_HEADER_LEN));
  78                 set_incoming_fault(p);
  79                 return false;
  80         }
  81
  82         frag_len = dcerpc_get_frag_length(&p->in_data.pdu);
  83
  84         /* verify it is a reasonable value */
  85         if ((frag_len < RPC_HEADER_LEN) ||
  86             (frag_len > RPC_MAX_PDU_FRAG_LEN)) {
  87                 DEBUG(0, ("Unexpected RPC Fragment size! (%d)\n",
  88                           frag_len));
  89                 set_incoming_fault(p);
  90                 return false;
  91         }
  92
  93         p->in_data.pdu_needed_len = frag_len - RPC_HEADER_LEN;
  94
  95         /* allocate the space needed to fill the pdu */
  96         p->in_data.pdu.data = talloc_realloc(p, p->in_data.pdu.data,
  97                                                 uint8_t, frag_len);
  98         if (p->in_data.pdu.data == NULL) {
  99                 DEBUG(0, ("talloc_realloc failed\n"));
 100                 set_incoming_fault(p);
 101                 return false;
 102         }
 103
 104         return true;
 105 }
 106
 107 /****************************************************************************
 108   Call this to free any talloc'ed memory. Do this after processing
 109   a complete incoming and outgoing request (multiple incoming/outgoing
 110   PDU's).
 111 ****************************************************************************/
 112
 113 static void free_pipe_context(struct pipes_struct *p)
 114 {
 115         data_blob_free(&p->out_data.frag);
 116         data_blob_free(&p->out_data.rdata);
 117         data_blob_free(&p->in_data.data);
 118
 119         DEBUG(3, ("free_pipe_context: "
 120                 "destroying talloc pool of size %lu\n",
 121                 (unsigned long)talloc_total_size(p->mem_ctx)));
 122         talloc_free_children(p->mem_ctx);
 123 }
 124
 125 /****************************************************************************
 126  Accepts incoming data on an rpc pipe. Processes the data in pdu sized units.
 127 ****************************************************************************/
 128
 129 ssize_t process_incoming_data(struct pipes_struct *p, const char *data, size_t n)
 130 {
 131         size_t data_to_copy = MIN(n, RPC_MAX_PDU_FRAG_LEN
 132                                         - p->in_data.pdu.length);
 133
 134         DEBUG(10, ("process_incoming_data: Start: pdu.length = %u, "
 135                    "pdu_needed_len = %u, incoming data = %u\n",
 136                    (unsigned int)p->in_data.pdu.length,
 137                    (unsigned int)p->in_data.pdu_needed_len,
 138                    (unsigned int)n ));
 139
 140         if(data_to_copy == 0) {
 141                 /*
 142                  * This is an error - data is being received and there is no
 143                  * space in the PDU. Free the received data and go into the
 144                  * fault state.
 145                  */
 146                 DEBUG(0, ("process_incoming_data: "
 147                           "No space in incoming pdu buffer. "
 148                           "Current size = %u incoming data size = %u\n",
 149                           (unsigned int)p->in_data.pdu.length,
 150                           (unsigned int)n));
 151                 set_incoming_fault(p);
 152                 return -1;
 153         }
 154
 155         /*
 156          * If we have no data already, wait until we get at least
 157          * a RPC_HEADER_LEN * number of bytes before we can do anything.
 158          */
 159
 160         if ((p->in_data.pdu_needed_len == 0) &&
 161             (p->in_data.pdu.length < RPC_HEADER_LEN)) {
 162                 /*
 163                  * Always return here. If we have more data then the RPC_HEADER
 164                  * will be processed the next time around the loop.
 165                  */
 166                 return fill_rpc_header(p, data, data_to_copy);
 167         }
 168
 169         /*
 170          * At this point we know we have at least an RPC_HEADER_LEN amount of
 171          * data stored in p->in_data.pdu.
 172          */
 173
 174         /*
 175          * If pdu_needed_len is zero this is a new pdu.
 176          * Check how much more data we need, then loop again.
 177          */
 178         if (p->in_data.pdu_needed_len == 0) {
 179
 180                 bool ok = get_pdu_size(p);
 181                 if (!ok) {
 182                         return -1;
 183                 }
 184                 if (p->in_data.pdu_needed_len > 0) {
 185                         return 0;
 186                 }
 187
 188                 /* If rret == 0 and pdu_needed_len == 0 here we have a PDU
 189                  * that consists of an RPC_HEADER only. This is a
 190                  * DCERPC_PKT_SHUTDOWN, DCERPC_PKT_CO_CANCEL or
 191                  * DCERPC_PKT_ORPHANED pdu type.
 192                  * Deal with this in process_complete_pdu(). */
 193         }
 194
 195         /*
 196          * Ok - at this point we have a valid RPC_HEADER.
 197          * Keep reading until we have a full pdu.
 198          */
 199
 200         data_to_copy = MIN(data_to_copy, p->in_data.pdu_needed_len);
 201
 202         /*
 203          * Copy as much of the data as we need into the p->in_data.pdu buffer.
 204          * pdu_needed_len becomes zero when we have a complete pdu.
 205          */
 206
 207         memcpy((char *)&p->in_data.pdu.data[p->in_data.pdu.length],
 208                 data, data_to_copy);
 209         p->in_data.pdu.length += data_to_copy;
 210         p->in_data.pdu_needed_len -= data_to_copy;
 211
 212         /*
 213          * Do we have a complete PDU ?
 214          * (return the number of bytes handled in the call)
 215          */
 216
 217         if(p->in_data.pdu_needed_len == 0) {
 218                 process_complete_pdu(p);
 219                 return data_to_copy;
 220         }
 221
 222         DEBUG(10, ("process_incoming_data: not a complete PDU yet. "
 223                    "pdu.length = %u, pdu_needed_len = %u\n",
 224                    (unsigned int)p->in_data.pdu.length,
 225                    (unsigned int)p->in_data.pdu_needed_len));
 226
 227         return (ssize_t)data_to_copy;
 228 }
 229
 230 /****************************************************************************
 231  Accepts incoming data on an internal rpc pipe.
 232 ****************************************************************************/
 233
 234 static ssize_t write_to_internal_pipe(struct pipes_struct *p, const char *data, size_t n)
 235 {
 236         size_t data_left = n;
 237
 238         while(data_left) {
 239                 ssize_t data_used;
 240
 241                 DEBUG(10, ("write_to_pipe: data_left = %u\n",
 242                           (unsigned int)data_left));
 243
 244                 data_used = process_incoming_data(p, data, data_left);
 245
 246                 DEBUG(10, ("write_to_pipe: data_used = %d\n",
 247                            (int)data_used));
 248
 249                 if(data_used < 0) {
 250                         return -1;
 251                 }
 252
 253                 data_left -= data_used;
 254                 data += data_used;
 255         }
 256
 257         return n;
 258 }
 259
 260 /****************************************************************************
 261  Replies to a request to read data from a pipe.
 262
 263  Headers are interspersed with the data at PDU intervals. By the time
 264  this function is called, the start of the data could possibly have been
 265  read by an SMBtrans (file_offset != 0).
 266
 267  Calling create_rpc_reply() here is a hack. The data should already
 268  have been prepared into arrays of headers + data stream sections.
 269 ****************************************************************************/
 270
 271 static ssize_t read_from_internal_pipe(struct pipes_struct *p, char *data,
 272                                        size_t n, bool *is_data_outstanding)
 273 {
 274         uint32 pdu_remaining = 0;
 275         ssize_t data_returned = 0;
 276
 277         if (!p) {
 278                 DEBUG(0,("read_from_pipe: pipe not open\n"));
 279                 return -1;
 280         }
 281
 282         DEBUG(6,(" name: %s len: %u\n",
 283                  get_pipe_name_from_syntax(talloc_tos(), &p->syntax),
 284                  (unsigned int)n));
 285
 286         /*
 287          * We cannot return more than one PDU length per
 288          * read request.
 289          */
 290
 291         /*
 292          * This condition should result in the connection being closed.
 293          * Netapp filers seem to set it to 0xffff which results in domain
 294          * authentications failing.  Just ignore it so things work.
 295          */
 296
 297         if(n > RPC_MAX_PDU_FRAG_LEN) {
 298                 DEBUG(5,("read_from_pipe: too large read (%u) requested on "
 299                          "pipe %s. We can only service %d sized reads.\n",
 300                          (unsigned int)n,
 301                          get_pipe_name_from_syntax(talloc_tos(), &p->syntax),
 302                          RPC_MAX_PDU_FRAG_LEN ));
 303                 n = RPC_MAX_PDU_FRAG_LEN;
 304         }
 305
 306         /*
 307          * Determine if there is still data to send in the
 308          * pipe PDU buffer. Always send this first. Never
 309          * send more than is left in the current PDU. The
 310          * client should send a new read request for a new
 311          * PDU.
 312          */
 313
 314         pdu_remaining = p->out_data.frag.length
 315                 - p->out_data.current_pdu_sent;
 316
 317         if (pdu_remaining > 0) {
 318                 data_returned = (ssize_t)MIN(n, pdu_remaining);
 319
 320                 DEBUG(10,("read_from_pipe: %s: current_pdu_len = %u, "
 321                           "current_pdu_sent = %u returning %d bytes.\n",
 322                           get_pipe_name_from_syntax(talloc_tos(), &p->syntax),
 323                           (unsigned int)p->out_data.frag.length,
 324                           (unsigned int)p->out_data.current_pdu_sent,
 325                           (int)data_returned));
 326
 327                 memcpy(data,
 328                        p->out_data.frag.data
 329                        + p->out_data.current_pdu_sent,
 330                        data_returned);
 331
 332                 p->out_data.current_pdu_sent += (uint32)data_returned;
 333                 goto out;
 334         }
 335
 336         /*
 337          * At this point p->current_pdu_len == p->current_pdu_sent (which
 338          * may of course be zero if this is the first return fragment.
 339          */
 340
 341         DEBUG(10,("read_from_pipe: %s: fault_state = %d : data_sent_length "
 342                   "= %u, p->out_data.rdata.length = %u.\n",
 343                   get_pipe_name_from_syntax(talloc_tos(), &p->syntax),
 344                   (int)p->fault_state,
 345                   (unsigned int)p->out_data.data_sent_length,
 346                   (unsigned int)p->out_data.rdata.length));
 347
 348         if (p->out_data.data_sent_length >= p->out_data.rdata.length) {
 349                 /*
 350                  * We have sent all possible data, return 0.
 351                  */
 352                 data_returned = 0;
 353                 goto out;
 354         }
 355
 356         /*
 357          * We need to create a new PDU from the data left in p->rdata.
 358          * Create the header/data/footers. This also sets up the fields
 359          * p->current_pdu_len, p->current_pdu_sent, p->data_sent_length
 360          * and stores the outgoing PDU in p->current_pdu.
 361          */
 362
 363         if(!create_next_pdu(p)) {
 364                 DEBUG(0,("read_from_pipe: %s: create_next_pdu failed.\n",
 365                          get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
 366                 return -1;
 367         }
 368
 369         data_returned = MIN(n, p->out_data.frag.length);
 370
 371         memcpy(data, p->out_data.frag.data, (size_t)data_returned);
 372         p->out_data.current_pdu_sent += (uint32)data_returned;
 373
 374   out:
 375         (*is_data_outstanding) = p->out_data.frag.length > n;
 376
 377         if (p->out_data.current_pdu_sent == p->out_data.frag.length) {
 378                 /* We've returned everything in the out_data.frag
 379                  * so we're done with this pdu. Free it and reset
 380                  * current_pdu_sent. */
 381                 p->out_data.current_pdu_sent = 0;
 382                 data_blob_free(&p->out_data.frag);
 383
 384                 if (p->out_data.data_sent_length >= p->out_data.rdata.length) {
 385                         /*
 386                          * We're completely finished with both outgoing and
 387                          * incoming data streams. It's safe to free all
 388                          * temporary data from this request.
 389                          */
 390                         free_pipe_context(p);
 391                 }
 392         }
 393
 394         return data_returned;
 395 }
 396
 397 bool fsp_is_np(struct files_struct *fsp)
 398 {
 399         enum FAKE_FILE_TYPE type;
 400
 401         if ((fsp == NULL) || (fsp->fake_file_handle == NULL)) {
 402                 return false;
 403         }
 404
 405         type = fsp->fake_file_handle->type;
 406
 407         return ((type == FAKE_FILE_TYPE_NAMED_PIPE)
 408                 || (type == FAKE_FILE_TYPE_NAMED_PIPE_PROXY));
 409 }
 410
 411 NTSTATUS np_open(TALLOC_CTX *mem_ctx, const char *name,
 412                  const struct tsocket_address *local_address,
 413                  const struct tsocket_address *remote_address,
 414                  struct client_address *client_id,
 415                  struct auth_serversupplied_info *session_info,
 416                  struct messaging_context *msg_ctx,
 417                  struct fake_file_handle **phandle)
 418 {
 419         const char *rpcsrv_type;
 420         const char **proxy_list;
 421         struct fake_file_handle *handle;
 422         bool external = false;
 423
 424         proxy_list = lp_parm_string_list(-1, "np", "proxy", NULL);
 425
 426         handle = talloc(mem_ctx, struct fake_file_handle);
 427         if (handle == NULL) {
 428                 return NT_STATUS_NO_MEMORY;
 429         }
 430
 431         /* Check what is the server type for this pipe.
 432            Defaults to "embedded" */
 433         rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
 434                                            "rpc_server", name,
 435                                            "embedded");
 436         if (StrCaseCmp(rpcsrv_type, "embedded") != 0) {
 437                 external = true;
 438         }
 439
 440         /* Still support the old method for defining external servers */
 441         if ((proxy_list != NULL) && str_list_check_ci(proxy_list, name)) {
 442                 external = true;
 443         }
 444
 445         if (external) {
 446                 struct np_proxy_state *p;
 447
 448                 p = make_external_rpc_pipe_p(handle, name,
 449                                              local_address,
 450                                              remote_address,
 451                                              session_info);
 452
 453                 handle->type = FAKE_FILE_TYPE_NAMED_PIPE_PROXY;
 454                 handle->private_data = p;
 455         } else {
 456                 struct pipes_struct *p;
 457                 struct ndr_syntax_id syntax;
 458
 459                 if (!is_known_pipename(name, &syntax)) {
 460                         TALLOC_FREE(handle);
 461                         return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 462                 }
 463
 464                 p = make_internal_rpc_pipe_p(handle, &syntax, client_id,
 465                                              session_info, msg_ctx);
 466
 467                 handle->type = FAKE_FILE_TYPE_NAMED_PIPE;
 468                 handle->private_data = p;
 469         }
 470
 471         if (handle->private_data == NULL) {
 472                 TALLOC_FREE(handle);
 473                 return NT_STATUS_PIPE_NOT_AVAILABLE;
 474         }
 475
 476         *phandle = handle;
 477
 478         return NT_STATUS_OK;
 479 }
 480
 481 bool np_read_in_progress(struct fake_file_handle *handle)
 482 {
 483         if (handle->type == FAKE_FILE_TYPE_NAMED_PIPE) {
 484                 return false;
 485         }
 486
 487         if (handle->type == FAKE_FILE_TYPE_NAMED_PIPE_PROXY) {
 488                 struct np_proxy_state *p = talloc_get_type_abort(
 489                         handle->private_data, struct np_proxy_state);
 490                 size_t read_count;
 491
 492                 read_count = tevent_queue_length(p->read_queue);
 493                 if (read_count > 0) {
 494                         return true;
 495                 }
 496
 497                 return false;
 498         }
 499
 500         return false;
 501 }
 502
 503 struct np_write_state {
 504         struct event_context *ev;
 505         struct np_proxy_state *p;
 506         struct iovec iov;
 507         ssize_t nwritten;
 508 };
 509
 510 static void np_write_done(struct tevent_req *subreq);
 511
 512 struct tevent_req *np_write_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 513                                  struct fake_file_handle *handle,
 514                                  const uint8_t *data, size_t len)
 515 {
 516         struct tevent_req *req;
 517         struct np_write_state *state;
 518         NTSTATUS status;
 519
 520         DEBUG(6, ("np_write_send: len: %d\n", (int)len));
 521         dump_data(50, data, len);
 522
 523         req = tevent_req_create(mem_ctx, &state, struct np_write_state);
 524         if (req == NULL) {
 525                 return NULL;
 526         }
 527
 528         if (len == 0) {
 529                 state->nwritten = 0;
 530                 status = NT_STATUS_OK;
 531                 goto post_status;
 532         }
 533
 534         if (handle->type == FAKE_FILE_TYPE_NAMED_PIPE) {
 535                 struct pipes_struct *p = talloc_get_type_abort(
 536                         handle->private_data, struct pipes_struct);
 537
 538                 state->nwritten = write_to_internal_pipe(p, (const char *)data, len);
 539
 540                 status = (state->nwritten >= 0)
 541                         ? NT_STATUS_OK : NT_STATUS_UNEXPECTED_IO_ERROR;
 542                 goto post_status;
 543         }
 544
 545         if (handle->type == FAKE_FILE_TYPE_NAMED_PIPE_PROXY) {
 546                 struct np_proxy_state *p = talloc_get_type_abort(
 547                         handle->private_data, struct np_proxy_state);
 548                 struct tevent_req *subreq;
 549
 550                 state->ev = ev;
 551                 state->p = p;
 552                 state->iov.iov_base = discard_const_p(void, data);
 553                 state->iov.iov_len = len;
 554
 555                 subreq = tstream_writev_queue_send(state, ev,
 556                                                    p->npipe,
 557                                                    p->write_queue,
 558                                                    &state->iov, 1);
 559                 if (subreq == NULL) {
 560                         goto fail;
 561                 }
 562                 tevent_req_set_callback(subreq, np_write_done, req);
 563                 return req;
 564         }
 565
 566         status = NT_STATUS_INVALID_HANDLE;
 567  post_status:
 568         if (NT_STATUS_IS_OK(status)) {
 569                 tevent_req_done(req);
 570         } else {
 571                 tevent_req_nterror(req, status);
 572         }
 573         return tevent_req_post(req, ev);
 574  fail:
 575         TALLOC_FREE(req);
 576         return NULL;
 577 }
 578
 579 static void np_write_done(struct tevent_req *subreq)
 580 {
 581         struct tevent_req *req = tevent_req_callback_data(
 582                 subreq, struct tevent_req);
 583         struct np_write_state *state = tevent_req_data(
 584                 req, struct np_write_state);
 585         ssize_t received;
 586         int err;
 587
 588         received = tstream_writev_queue_recv(subreq, &err);
 589         if (received < 0) {
 590                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 591                 return;
 592         }
 593         state->nwritten = received;
 594         tevent_req_done(req);
 595 }
 596
 597 NTSTATUS np_write_recv(struct tevent_req *req, ssize_t *pnwritten)
 598 {
 599         struct np_write_state *state = tevent_req_data(
 600                 req, struct np_write_state);
 601         NTSTATUS status;
 602
 603         if (tevent_req_is_nterror(req, &status)) {
 604                 return status;
 605         }
 606         *pnwritten = state->nwritten;
 607         return NT_STATUS_OK;
 608 }
 609
 610 struct np_ipc_readv_next_vector_state {
 611         uint8_t *buf;
 612         size_t len;
 613         off_t ofs;
 614         size_t remaining;
 615 };
 616
 617 static void np_ipc_readv_next_vector_init(struct np_ipc_readv_next_vector_state *s,
 618                                           uint8_t *buf, size_t len)
 619 {
 620         ZERO_STRUCTP(s);
 621
 622         s->buf = buf;
 623         s->len = MIN(len, UINT16_MAX);
 624 }
 625
 626 static int np_ipc_readv_next_vector(struct tstream_context *stream,
 627                                     void *private_data,
 628                                     TALLOC_CTX *mem_ctx,
 629                                     struct iovec **_vector,
 630                                     size_t *count)
 631 {
 632         struct np_ipc_readv_next_vector_state *state =
 633                 (struct np_ipc_readv_next_vector_state *)private_data;
 634         struct iovec *vector;
 635         ssize_t pending;
 636         size_t wanted;
 637
 638         if (state->ofs == state->len) {
 639                 *_vector = NULL;
 640                 *count = 0;
 641                 return 0;
 642         }
 643
 644         pending = tstream_pending_bytes(stream);
 645         if (pending == -1) {
 646                 return -1;
 647         }
 648
 649         if (pending == 0 && state->ofs != 0) {
 650                 /* return a short read */
 651                 *_vector = NULL;
 652                 *count = 0;
 653                 return 0;
 654         }
 655
 656         if (pending == 0) {
 657                 /* we want at least one byte and recheck again */
 658                 wanted = 1;
 659         } else {
 660                 size_t missing = state->len - state->ofs;
 661                 if (pending > missing) {
 662                         /* there's more available */
 663                         state->remaining = pending - missing;
 664                         wanted = missing;
 665                 } else {
 666                         /* read what we can get and recheck in the next cycle */
 667                         wanted = pending;
 668                 }
 669         }
 670
 671         vector = talloc_array(mem_ctx, struct iovec, 1);
 672         if (!vector) {
 673                 return -1;
 674         }
 675
 676         vector[0].iov_base = state->buf + state->ofs;
 677         vector[0].iov_len = wanted;
 678
 679         state->ofs += wanted;
 680
 681         *_vector = vector;
 682         *count = 1;
 683         return 0;
 684 }
 685
 686 struct np_read_state {
 687         struct np_proxy_state *p;
 688         struct np_ipc_readv_next_vector_state next_vector;
 689
 690         size_t nread;
 691         bool is_data_outstanding;
 692 };
 693
 694 static void np_read_done(struct tevent_req *subreq);
 695
 696 struct tevent_req *np_read_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 697                                 struct fake_file_handle *handle,
 698                                 uint8_t *data, size_t len)
 699 {
 700         struct tevent_req *req;
 701         struct np_read_state *state;
 702         NTSTATUS status;
 703
 704         req = tevent_req_create(mem_ctx, &state, struct np_read_state);
 705         if (req == NULL) {
 706                 return NULL;
 707         }
 708
 709         if (handle->type == FAKE_FILE_TYPE_NAMED_PIPE) {
 710                 struct pipes_struct *p = talloc_get_type_abort(
 711                         handle->private_data, struct pipes_struct);
 712
 713                 state->nread = read_from_internal_pipe(
 714                         p, (char *)data, len, &state->is_data_outstanding);
 715
 716                 status = (state->nread >= 0)
 717                         ? NT_STATUS_OK : NT_STATUS_UNEXPECTED_IO_ERROR;
 718                 goto post_status;
 719         }
 720
 721         if (handle->type == FAKE_FILE_TYPE_NAMED_PIPE_PROXY) {
 722                 struct np_proxy_state *p = talloc_get_type_abort(
 723                         handle->private_data, struct np_proxy_state);
 724                 struct tevent_req *subreq;
 725
 726                 np_ipc_readv_next_vector_init(&state->next_vector,
 727                                               data, len);
 728
 729                 subreq = tstream_readv_pdu_queue_send(state,
 730                                                       ev,
 731                                                       p->npipe,
 732                                                       p->read_queue,
 733                                                       np_ipc_readv_next_vector,
 734                                                       &state->next_vector);
 735                 if (subreq == NULL) {
 736                         status = NT_STATUS_NO_MEMORY;
 737                         goto post_status;
 738                 }
 739                 tevent_req_set_callback(subreq, np_read_done, req);
 740                 return req;
 741         }
 742
 743         status = NT_STATUS_INVALID_HANDLE;
 744  post_status:
 745         if (NT_STATUS_IS_OK(status)) {
 746                 tevent_req_done(req);
 747         } else {
 748                 tevent_req_nterror(req, status);
 749         }
 750         return tevent_req_post(req, ev);
 751 }
 752
 753 static void np_read_done(struct tevent_req *subreq)
 754 {
 755         struct tevent_req *req = tevent_req_callback_data(
 756                 subreq, struct tevent_req);
 757         struct np_read_state *state = tevent_req_data(
 758                 req, struct np_read_state);
 759         ssize_t ret;
 760         int err;
 761
 762         ret = tstream_readv_pdu_queue_recv(subreq, &err);
 763         TALLOC_FREE(subreq);
 764         if (ret == -1) {
 765                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 766                 return;
 767         }
 768
 769         state->nread = ret;
 770         state->is_data_outstanding = (state->next_vector.remaining > 0);
 771
 772         tevent_req_done(req);
 773         return;
 774 }
 775
 776 NTSTATUS np_read_recv(struct tevent_req *req, ssize_t *nread,
 777                       bool *is_data_outstanding)
 778 {
 779         struct np_read_state *state = tevent_req_data(
 780                 req, struct np_read_state);
 781         NTSTATUS status;
 782
 783         if (tevent_req_is_nterror(req, &status)) {
 784                 return status;
 785         }
 786
 787         DEBUG(10, ("Received %d bytes. There is %smore data outstanding\n",
 788                    (int)state->nread, state->is_data_outstanding?"":"no "));
 789
 790         *nread = state->nread;
 791         *is_data_outstanding = state->is_data_outstanding;
 792         return NT_STATUS_OK;
 793 }