source3/rpc_client/rpc_transport_smbd.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC client transport over named pipes to a child smbd
   4  *  Copyright (C) Volker Lendecke 2009
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21
  22 #undef DBGC_CLASS
  23 #define DBGC_CLASS DBGC_RPC_CLI
  24
  25 /**
  26  * struct rpc_cli_smbd_conn represents a forked smbd. This structure should
  27  * exist only once per process which does the rpc calls.
  28  *
  29  * RPC pipe handles can be attached to this smbd connection with
  30  * rpc_pipe_open_local().
  31  *
  32  * For this to work right, we can not use rpc_transport_np directly, because
  33  * the child smbd wants to write its DEBUG output somewhere. We redirect the
  34  * child's output to rpc_cli_smbd_conn->stdout_fd. While the RPC calls are
  35  * active, we have an event context available and attach a fd event to the
  36  * stdout_df.
  37  */
  38
  39 struct rpc_cli_smbd_conn {
  40         /**
  41          * The smb connection to handle the named pipe traffic over
  42          */
  43         struct cli_state *cli;
  44
  45         /**
  46          * Attached to stdout in the forked smbd, this is where smbd will
  47          * print its DEBUG.
  48          */
  49         int stdout_fd;
  50
  51         /**
  52          * Custom callback provided by the owner of the
  53          * rpc_cli_smbd_conn. Here we send the smbd DEBUG output. Can be NULL.
  54          */
  55         struct {
  56                 void (*fn)(char *buf, size_t len, void *priv);
  57                 void *priv;
  58         } stdout_callback ;
  59 };
  60
  61 /**
  62  * Event handler to be called whenever the forked smbd prints debugging
  63  * output.
  64  */
  65
  66 static void rpc_cli_smbd_stdout_reader(struct event_context *ev,
  67                                        struct fd_event *fde,
  68                                        uint16_t flags, void *priv)
  69 {
  70         struct rpc_cli_smbd_conn *conn = talloc_get_type_abort(
  71                 priv, struct rpc_cli_smbd_conn);
  72         char buf[1024];
  73         ssize_t nread;
  74
  75         if ((flags & EVENT_FD_READ) == 0) {
  76                 return;
  77         }
  78
  79         nread = read(conn->stdout_fd, buf, sizeof(buf)-1);
  80         if (nread < 0) {
  81                 DEBUG(0, ("Could not read from smbd stdout: %s\n",
  82                           strerror(errno)));
  83                 TALLOC_FREE(fde);
  84                 return;
  85         }
  86         if (nread == 0) {
  87                 DEBUG(0, ("EOF from smbd stdout\n"));
  88                 TALLOC_FREE(fde);
  89                 return;
  90         }
  91         buf[nread] = '\0';
  92
  93         if (conn->stdout_callback.fn != NULL) {
  94                 conn->stdout_callback.fn(buf, nread,
  95                                          conn->stdout_callback.priv);
  96         }
  97 }
  98
  99 /**
 100  * struct rpc_transport_smbd_state is the link from a struct rpc_pipe_client
 101  * to the rpc_cli_smbd_conn. We use a named pipe transport as a subtransport.
 102  */
 103
 104 struct rpc_transport_smbd_state {
 105         struct rpc_cli_smbd_conn *conn;
 106         struct rpc_cli_transport *sub_transp;
 107 };
 108
 109 static int rpc_cli_smbd_conn_destructor(struct rpc_cli_smbd_conn *conn)
 110 {
 111         if (conn->cli != NULL) {
 112                 cli_shutdown(conn->cli);
 113                 conn->cli = NULL;
 114         }
 115         if (conn->stdout_fd != -1) {
 116                 close(conn->stdout_fd);
 117                 conn->stdout_fd = -1;
 118         }
 119         return 0;
 120 }
 121
 122 /*
 123  * Do the negprot/sesssetup/tcon to an anonymous ipc$ connection
 124  */
 125
 126 struct get_anon_ipc_state {
 127         struct event_context *ev;
 128         struct cli_state *cli;
 129 };
 130
 131 static void get_anon_ipc_negprot_done(struct tevent_req *subreq);
 132 static void get_anon_ipc_sesssetup_done(struct tevent_req *subreq);
 133 static void get_anon_ipc_tcon_done(struct tevent_req *subreq);
 134
 135 static struct tevent_req *get_anon_ipc_send(TALLOC_CTX *mem_ctx,
 136                                             struct event_context *ev,
 137                                             struct cli_state *cli)
 138 {
 139         struct tevent_req *req, *subreq;
 140         struct get_anon_ipc_state *state;
 141
 142         req = tevent_req_create(mem_ctx, &state, struct get_anon_ipc_state);
 143         if (req == NULL) {
 144                 return NULL;
 145         }
 146         state->ev = ev;
 147         state->cli = cli;
 148
 149         subreq = cli_negprot_send(state, ev, cli);
 150         if (tevent_req_nomem(subreq, req)) {
 151                 return tevent_req_post(req, ev);
 152         }
 153         tevent_req_set_callback(subreq, get_anon_ipc_negprot_done, req);
 154         return req;
 155 }
 156
 157 static void get_anon_ipc_negprot_done(struct tevent_req *subreq)
 158 {
 159         struct tevent_req *req = tevent_req_callback_data(
 160                 subreq, struct tevent_req);
 161         struct get_anon_ipc_state *state = tevent_req_data(
 162                 req, struct get_anon_ipc_state);
 163         NTSTATUS status;
 164
 165         status = cli_negprot_recv(subreq);
 166         TALLOC_FREE(subreq);
 167         if (!NT_STATUS_IS_OK(status)) {
 168                 tevent_req_nterror(req, status);
 169                 return;
 170         }
 171
 172         subreq = cli_session_setup_guest_send(state, state->ev, state->cli);
 173         if (tevent_req_nomem(subreq, req)) {
 174                 return;
 175         }
 176         tevent_req_set_callback(subreq, get_anon_ipc_sesssetup_done, req);
 177 }
 178
 179 static void get_anon_ipc_sesssetup_done(struct tevent_req *subreq)
 180 {
 181         struct tevent_req *req = tevent_req_callback_data(
 182                 subreq, struct tevent_req);
 183         struct get_anon_ipc_state *state = tevent_req_data(
 184                 req, struct get_anon_ipc_state);
 185         NTSTATUS status;
 186
 187         status = cli_session_setup_guest_recv(subreq);
 188         TALLOC_FREE(subreq);
 189         if (!NT_STATUS_IS_OK(status)) {
 190                 tevent_req_nterror(req, status);
 191                 return;
 192         }
 193
 194         subreq = cli_tcon_andx_send(state, state->ev, state->cli,
 195                                     "IPC$", "IPC", NULL, 0);
 196         if (tevent_req_nomem(subreq, req)) {
 197                 return;
 198         }
 199         tevent_req_set_callback(subreq, get_anon_ipc_tcon_done, req);
 200 }
 201
 202 static void get_anon_ipc_tcon_done(struct tevent_req *subreq)
 203 {
 204         struct tevent_req *req = tevent_req_callback_data(
 205                 subreq, struct tevent_req);
 206         NTSTATUS status;
 207
 208         status = cli_tcon_andx_recv(subreq);
 209         TALLOC_FREE(subreq);
 210         if (!NT_STATUS_IS_OK(status)) {
 211                 tevent_req_nterror(req, status);
 212                 return;
 213         }
 214         tevent_req_done(req);
 215 }
 216
 217 static NTSTATUS get_anon_ipc_recv(struct tevent_req *req)
 218 {
 219         return tevent_req_simple_recv_ntstatus(req);
 220 }
 221
 222 struct rpc_cli_smbd_conn_init_state {
 223         struct event_context *ev;
 224         struct rpc_cli_smbd_conn *conn;
 225 };
 226
 227 static void rpc_cli_smbd_conn_init_done(struct tevent_req *subreq);
 228
 229 struct tevent_req *rpc_cli_smbd_conn_init_send(TALLOC_CTX *mem_ctx,
 230                                                struct event_context *ev,
 231                                                void (*stdout_callback)(char *buf,
 232                                                                        size_t len,
 233                                                                        void *priv),
 234                                                void *priv)
 235 {
 236         struct tevent_req *req, *subreq;
 237         struct rpc_cli_smbd_conn_init_state *state;
 238         int smb_sock[2];
 239         int stdout_pipe[2];
 240         NTSTATUS status;
 241         pid_t pid;
 242         int ret;
 243
 244         smb_sock[0] = smb_sock[1] = stdout_pipe[0] = stdout_pipe[1] = -1;
 245
 246         req = tevent_req_create(mem_ctx, &state,
 247                                 struct rpc_cli_smbd_conn_init_state);
 248         if (req == NULL) {
 249                 return NULL;
 250         }
 251         state->ev = ev;
 252
 253         state->conn = talloc(state, struct rpc_cli_smbd_conn);
 254         if (tevent_req_nomem(state->conn, req)) {
 255                 return tevent_req_post(req, ev);
 256         }
 257
 258         state->conn->cli = cli_initialise();
 259         if (tevent_req_nomem(state->conn->cli, req)) {
 260                 return tevent_req_post(req, ev);
 261         }
 262         state->conn->stdout_fd = -1;
 263         state->conn->stdout_callback.fn = stdout_callback;
 264         state->conn->stdout_callback.priv = priv;
 265         talloc_set_destructor(state->conn, rpc_cli_smbd_conn_destructor);
 266
 267         ret = socketpair(AF_UNIX, SOCK_STREAM, 0, smb_sock);
 268         if (ret == -1) {
 269                 status = map_nt_error_from_unix(errno);
 270                 goto post_status;
 271         }
 272         ret = pipe(stdout_pipe);
 273         if (ret == -1) {
 274                 status = map_nt_error_from_unix(errno);
 275                 goto post_status;
 276         }
 277
 278         pid = sys_fork();
 279         if (pid == -1) {
 280                 status = map_nt_error_from_unix(errno);
 281                 goto post_status;
 282         }
 283         if (pid == 0) {
 284                 char *smbd_cmd;
 285
 286                 close(smb_sock[0]);
 287                 close(stdout_pipe[0]);
 288                 close(0);
 289                 if (dup(smb_sock[1]) == -1) {
 290                         exit(1);
 291                 }
 292                 close(smb_sock[1]);
 293                 close(1);
 294                 if (dup(stdout_pipe[1]) == -1) {
 295                         exit(1);
 296                 }
 297                 close(stdout_pipe[1]);
 298
 299                 smbd_cmd = getenv("SMB_PATH");
 300
 301                 if ((smbd_cmd == NULL)
 302                     && (asprintf(&smbd_cmd, "%s/smbd", get_dyn_SBINDIR())
 303                         == -1)) {
 304                         printf("no memory");
 305                         exit(1);
 306                 }
 307                 if (asprintf(&smbd_cmd, "%s -F -S -d %d", smbd_cmd,
 308                              DEBUGLEVEL) == -1) {
 309                         printf("no memory");
 310                         exit(1);
 311                 }
 312
 313                 exit(system(smbd_cmd));
 314         }
 315
 316         state->conn->cli->fd = smb_sock[0];
 317         smb_sock[0] = -1;
 318         close(smb_sock[1]);
 319         smb_sock[1] = -1;
 320
 321         state->conn->stdout_fd = stdout_pipe[0];
 322         stdout_pipe[0] = -1;
 323         close(stdout_pipe[1]);
 324         stdout_pipe[1] = -1;
 325
 326         subreq = get_anon_ipc_send(state, ev, state->conn->cli);
 327         if (tevent_req_nomem(subreq, req)) {
 328                 return tevent_req_post(req, ev);
 329         }
 330
 331         if (event_add_fd(ev, state, state->conn->stdout_fd, EVENT_FD_READ,
 332                          rpc_cli_smbd_stdout_reader, state->conn) == NULL) {
 333                 status = NT_STATUS_NO_MEMORY;
 334                 goto post_status;
 335         }
 336
 337         tevent_req_set_callback(subreq, rpc_cli_smbd_conn_init_done, req);
 338         return req;
 339
 340  post_status:
 341         if (smb_sock[0] != -1) {
 342                 close(smb_sock[0]);
 343         }
 344         if (smb_sock[1] != -1) {
 345                 close(smb_sock[1]);
 346         }
 347         if (stdout_pipe[0] != -1) {
 348                 close(stdout_pipe[0]);
 349         }
 350         if (stdout_pipe[1] != -1) {
 351                 close(stdout_pipe[1]);
 352         }
 353         tevent_req_nterror(req, status);
 354         return tevent_req_post(req, ev);
 355 }
 356
 357 static void rpc_cli_smbd_conn_init_done(struct tevent_req *subreq)
 358 {
 359         struct tevent_req *req = tevent_req_callback_data(
 360                 subreq, struct tevent_req);
 361         NTSTATUS status;
 362
 363         status = get_anon_ipc_recv(subreq);
 364         TALLOC_FREE(subreq);
 365         if (!NT_STATUS_IS_OK(status)) {
 366                 tevent_req_nterror(req, status);
 367                 return;
 368         }
 369         tevent_req_done(req);
 370 }
 371
 372 NTSTATUS rpc_cli_smbd_conn_init_recv(struct tevent_req *req,
 373                                      TALLOC_CTX *mem_ctx,
 374                                      struct rpc_cli_smbd_conn **pconn)
 375 {
 376         struct rpc_cli_smbd_conn_init_state *state = tevent_req_data(
 377                 req, struct rpc_cli_smbd_conn_init_state);
 378         NTSTATUS status;
 379
 380         if (tevent_req_is_nterror(req, &status)) {
 381                 return status;
 382         }
 383         *pconn = talloc_move(mem_ctx, &state->conn);
 384         return NT_STATUS_OK;
 385 }
 386
 387 NTSTATUS rpc_cli_smbd_conn_init(TALLOC_CTX *mem_ctx,
 388                                 struct rpc_cli_smbd_conn **pconn,
 389                                 void (*stdout_callback)(char *buf,
 390                                                         size_t len,
 391                                                         void *priv),
 392                                 void *priv)
 393 {
 394         TALLOC_CTX *frame = talloc_stackframe();
 395         struct event_context *ev;
 396         struct tevent_req *req;
 397         NTSTATUS status;
 398
 399         ev = event_context_init(frame);
 400         if (ev == NULL) {
 401                 status = NT_STATUS_NO_MEMORY;
 402                 goto fail;
 403         }
 404
 405         req = rpc_cli_smbd_conn_init_send(frame, ev, stdout_callback, priv);
 406         if (req == NULL) {
 407                 status = NT_STATUS_NO_MEMORY;
 408                 goto fail;
 409         }
 410
 411         if (!tevent_req_poll(req, ev)) {
 412                 status = map_nt_error_from_unix(errno);
 413                 goto fail;
 414         }
 415
 416         status = rpc_cli_smbd_conn_init_recv(req, mem_ctx, pconn);
 417  fail:
 418         TALLOC_FREE(frame);
 419         return status;
 420 }
 421
 422 struct rpc_smbd_write_state {
 423         struct rpc_cli_transport *sub_transp;
 424         ssize_t written;
 425 };
 426
 427 static void rpc_smbd_write_done(struct tevent_req *subreq);
 428
 429 static struct tevent_req *rpc_smbd_write_send(TALLOC_CTX *mem_ctx,
 430                                               struct event_context *ev,
 431                                               const uint8_t *data, size_t size,
 432                                               void *priv)
 433 {
 434         struct rpc_transport_smbd_state *transp = talloc_get_type_abort(
 435                 priv, struct rpc_transport_smbd_state);
 436         struct tevent_req *req, *subreq;
 437         struct rpc_smbd_write_state *state;
 438
 439         req = tevent_req_create(mem_ctx, &state, struct rpc_smbd_write_state);
 440         if (req == NULL) {
 441                 return NULL;
 442         }
 443         state->sub_transp = transp->sub_transp;
 444
 445         subreq = transp->sub_transp->write_send(state, ev, data, size,
 446                                                 transp->sub_transp->priv);
 447         if (subreq == NULL) {
 448                 goto fail;
 449         }
 450
 451         if (event_add_fd(ev, state, transp->conn->stdout_fd, EVENT_FD_READ,
 452                          rpc_cli_smbd_stdout_reader, transp->conn) == NULL) {
 453                 goto fail;
 454         }
 455         tevent_req_set_callback(subreq, rpc_smbd_write_done, req);
 456         return req;
 457
 458  fail:
 459         TALLOC_FREE(req);
 460         return NULL;
 461 }
 462
 463 static void rpc_smbd_write_done(struct tevent_req *subreq)
 464 {
 465         struct tevent_req *req = tevent_req_callback_data(
 466                 subreq, struct tevent_req);
 467         struct rpc_smbd_write_state *state = tevent_req_data(
 468                 req, struct rpc_smbd_write_state);
 469         NTSTATUS status;
 470
 471         status = state->sub_transp->write_recv(subreq, &state->written);
 472         TALLOC_FREE(subreq);
 473         if (!NT_STATUS_IS_OK(status)) {
 474                 tevent_req_nterror(req, status);
 475                 return;
 476         }
 477         tevent_req_done(req);
 478 }
 479
 480 static NTSTATUS rpc_smbd_write_recv(struct tevent_req *req, ssize_t *pwritten)
 481 {
 482         struct rpc_smbd_write_state *state = tevent_req_data(
 483                 req, struct rpc_smbd_write_state);
 484         NTSTATUS status;
 485
 486         if (tevent_req_is_nterror(req, &status)) {
 487                 return status;
 488         }
 489         *pwritten = state->written;
 490         return NT_STATUS_OK;
 491 }
 492
 493 struct rpc_smbd_read_state {
 494         struct rpc_cli_transport *sub_transp;
 495         ssize_t received;
 496 };
 497
 498 static void rpc_smbd_read_done(struct tevent_req *subreq);
 499
 500 static struct tevent_req *rpc_smbd_read_send(TALLOC_CTX *mem_ctx,
 501                                              struct event_context *ev,
 502                                              uint8_t *data, size_t size,
 503                                              void *priv)
 504 {
 505         struct rpc_transport_smbd_state *transp = talloc_get_type_abort(
 506                 priv, struct rpc_transport_smbd_state);
 507         struct tevent_req *req, *subreq;
 508         struct rpc_smbd_read_state *state;
 509
 510         req = tevent_req_create(mem_ctx, &state, struct rpc_smbd_read_state);
 511         if (req == NULL) {
 512                 return NULL;
 513         }
 514         state->sub_transp = transp->sub_transp;
 515
 516         subreq = transp->sub_transp->read_send(state, ev, data, size,
 517                                                 transp->sub_transp->priv);
 518         if (subreq == NULL) {
 519                 goto fail;
 520         }
 521
 522         if (event_add_fd(ev, state, transp->conn->stdout_fd, EVENT_FD_READ,
 523                          rpc_cli_smbd_stdout_reader, transp->conn) == NULL) {
 524                 goto fail;
 525         }
 526         tevent_req_set_callback(subreq, rpc_smbd_read_done, req);
 527         return req;
 528  fail:
 529         TALLOC_FREE(req);
 530         return NULL;
 531 }
 532
 533 static void rpc_smbd_read_done(struct tevent_req *subreq)
 534 {
 535         struct tevent_req *req = tevent_req_callback_data(
 536                 subreq, struct tevent_req);
 537         struct rpc_smbd_read_state *state = tevent_req_data(
 538                 req, struct rpc_smbd_read_state);
 539         NTSTATUS status;
 540
 541         status = state->sub_transp->read_recv(subreq, &state->received);
 542         TALLOC_FREE(subreq);
 543         if (!NT_STATUS_IS_OK(status)) {
 544                 tevent_req_nterror(req, status);
 545                 return;
 546         }
 547         tevent_req_done(req);
 548 }
 549
 550 static NTSTATUS rpc_smbd_read_recv(struct tevent_req *req, ssize_t *preceived)
 551 {
 552         struct rpc_smbd_read_state *state = tevent_req_data(
 553                 req, struct rpc_smbd_read_state);
 554         NTSTATUS status;
 555
 556         if (tevent_req_is_nterror(req, &status)) {
 557                 return status;
 558         }
 559         *preceived = state->received;
 560         return NT_STATUS_OK;
 561 }
 562
 563 struct rpc_transport_smbd_init_state {
 564         struct rpc_cli_transport *transport;
 565         struct rpc_transport_smbd_state *transport_smbd;
 566 };
 567
 568 static void rpc_transport_smbd_init_done(struct tevent_req *subreq);
 569
 570 struct tevent_req *rpc_transport_smbd_init_send(TALLOC_CTX *mem_ctx,
 571                                                 struct event_context *ev,
 572                                                 struct rpc_cli_smbd_conn *conn,
 573                                                 const struct ndr_syntax_id *abstract_syntax)
 574 {
 575         struct tevent_req *req, *subreq;
 576         struct rpc_transport_smbd_init_state *state;
 577
 578         req = tevent_req_create(mem_ctx, &state,
 579                                 struct rpc_transport_smbd_init_state);
 580         if (req == NULL) {
 581                 return NULL;
 582         }
 583
 584         state->transport = talloc(state, struct rpc_cli_transport);
 585         if (tevent_req_nomem(state->transport, req)) {
 586                 return tevent_req_post(req, ev);
 587         }
 588         state->transport_smbd = talloc(state->transport,
 589                                        struct rpc_transport_smbd_state);
 590         if (tevent_req_nomem(state->transport_smbd, req)) {
 591                 return tevent_req_post(req, ev);
 592         }
 593         state->transport_smbd->conn = conn;
 594         state->transport->priv = state->transport_smbd;
 595
 596         if (event_add_fd(ev, state, conn->stdout_fd, EVENT_FD_READ,
 597                          rpc_cli_smbd_stdout_reader, conn) == NULL) {
 598                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 599                 return tevent_req_post(req, ev);
 600         }
 601
 602         subreq = rpc_transport_np_init_send(state, ev, conn->cli,
 603                                             abstract_syntax);
 604         if (tevent_req_nomem(subreq, req)) {
 605                 return tevent_req_post(req, ev);
 606         }
 607         tevent_req_set_callback(subreq, rpc_transport_smbd_init_done, req);
 608         return req;
 609 }
 610
 611 static void rpc_transport_smbd_init_done(struct tevent_req *subreq)
 612 {
 613         struct tevent_req *req = tevent_req_callback_data(
 614                 subreq, struct tevent_req);
 615         struct rpc_transport_smbd_init_state *state = tevent_req_data(
 616                 req, struct rpc_transport_smbd_init_state);
 617         NTSTATUS status;
 618
 619         status = rpc_transport_np_init_recv(
 620                 subreq, state->transport_smbd,
 621                 &state->transport_smbd->sub_transp);
 622         TALLOC_FREE(subreq);
 623         if (!NT_STATUS_IS_OK(status)) {
 624                 tevent_req_nterror(req, status);
 625                 return;
 626         }
 627         tevent_req_done(req);
 628 }
 629
 630 NTSTATUS rpc_transport_smbd_init_recv(struct tevent_req *req,
 631                                       TALLOC_CTX *mem_ctx,
 632                                       struct rpc_cli_transport **presult)
 633 {
 634         struct rpc_transport_smbd_init_state *state = tevent_req_data(
 635                 req, struct rpc_transport_smbd_init_state);
 636         NTSTATUS status;
 637
 638         if (tevent_req_is_nterror(req, &status)) {
 639                 return status;
 640         }
 641
 642         state->transport->write_send = rpc_smbd_write_send;
 643         state->transport->write_recv = rpc_smbd_write_recv;
 644         state->transport->read_send = rpc_smbd_read_send;
 645         state->transport->read_recv = rpc_smbd_read_recv;
 646         state->transport->trans_send = NULL;
 647         state->transport->trans_recv = NULL;
 648
 649         *presult = talloc_move(mem_ctx, &state->transport);
 650         return NT_STATUS_OK;
 651 }
 652
 653 NTSTATUS rpc_transport_smbd_init(TALLOC_CTX *mem_ctx,
 654                                  struct rpc_cli_smbd_conn *conn,
 655                                  const struct ndr_syntax_id *abstract_syntax,
 656                                  struct rpc_cli_transport **presult)
 657 {
 658         TALLOC_CTX *frame = talloc_stackframe();
 659         struct event_context *ev;
 660         struct tevent_req *req;
 661         NTSTATUS status;
 662
 663         ev = event_context_init(frame);
 664         if (ev == NULL) {
 665                 status = NT_STATUS_NO_MEMORY;
 666                 goto fail;
 667         }
 668
 669         req = rpc_transport_smbd_init_send(frame, ev, conn, abstract_syntax);
 670         if (req == NULL) {
 671                 status = NT_STATUS_NO_MEMORY;
 672                 goto fail;
 673         }
 674
 675         if (!tevent_req_poll(req, ev)) {
 676                 status = map_nt_error_from_unix(errno);
 677                 goto fail;
 678         }
 679
 680         status = rpc_transport_smbd_init_recv(req, mem_ctx, presult);
 681  fail:
 682         TALLOC_FREE(frame);
 683         return status;
 684 }