source3/rpc_client/rpc_transport_tstream.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC client transport over tstream
   4  *  Copyright (C) Simo Sorce 2010
   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 #include "../lib/util/tevent_ntstatus.h"
  22 #include "rpc_client/rpc_transport.h"
  23 #include "lib/tsocket/tsocket.h"
  24 #include "libcli/smb/tstream_smbXcli_np.h"
  25 #include "cli_pipe.h"
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_RPC_CLI
  29
  30 struct rpc_tstream_state {
  31         struct tstream_context *stream;
  32         struct tevent_queue *read_queue;
  33         struct tevent_queue *write_queue;
  34         unsigned int timeout;
  35 };
  36
  37 static void rpc_tstream_disconnect(struct rpc_tstream_state *s)
  38 {
  39         TALLOC_FREE(s->stream);
  40 }
  41
  42 static bool rpc_tstream_is_connected(void *priv)
  43 {
  44         struct rpc_tstream_state *transp =
  45                 talloc_get_type_abort(priv, struct rpc_tstream_state);
  46         ssize_t ret;
  47
  48         if (!transp->stream) {
  49                 return false;
  50         }
  51
  52         if (!tstream_is_smbXcli_np(transp->stream)) {
  53                 return true;
  54         }
  55
  56         ret = tstream_pending_bytes(transp->stream);
  57         if (ret == -1) {
  58                 return false;
  59         }
  60
  61         return true;
  62 }
  63
  64 static unsigned int rpc_tstream_set_timeout(void *priv, unsigned int timeout)
  65 {
  66         struct rpc_tstream_state *transp =
  67                 talloc_get_type_abort(priv, struct rpc_tstream_state);
  68         int orig_timeout;
  69         bool ok;
  70
  71         ok = rpc_tstream_is_connected(transp);
  72         if (!ok) {
  73                 return 0;
  74         }
  75
  76         if (tstream_is_smbXcli_np(transp->stream)) {
  77                 transp->timeout = timeout;
  78                 return tstream_smbXcli_np_set_timeout(transp->stream, timeout);
  79         }
  80
  81         orig_timeout = transp->timeout;
  82
  83         transp->timeout = timeout;
  84
  85         return orig_timeout;
  86 }
  87
  88 struct rpc_tstream_next_vector_state {
  89         uint8_t *buf;
  90         size_t len;
  91         off_t ofs;
  92 };
  93
  94 static void rpc_tstream_next_vector_init(
  95                                 struct rpc_tstream_next_vector_state *s,
  96                                 uint8_t *buf, size_t len)
  97 {
  98         *s = (struct rpc_tstream_next_vector_state) {
  99                 .buf = buf, .len = MIN(len, UINT16_MAX),
 100         };
 101 }
 102
 103 static int rpc_tstream_next_vector(struct tstream_context *stream,
 104                                    void *private_data,
 105                                    TALLOC_CTX *mem_ctx,
 106                                    struct iovec **_vector,
 107                                    size_t *count)
 108 {
 109         struct rpc_tstream_next_vector_state *state =
 110                 (struct rpc_tstream_next_vector_state *)private_data;
 111         struct iovec *vector;
 112
 113         if (state->ofs == state->len) {
 114                 *_vector = NULL;
 115                 *count = 0;
 116                 return 0;
 117         }
 118
 119         vector = talloc_array(mem_ctx, struct iovec, 1);
 120         if (!vector) {
 121                 return -1;
 122         }
 123
 124         vector[0].iov_base = state->buf;
 125         vector[0].iov_len = state->len;
 126
 127         state->ofs = state->len;
 128
 129         *_vector = vector;
 130         *count = 1;
 131         return 0;
 132 }
 133
 134 struct rpc_tstream_read_state {
 135         struct rpc_tstream_state *transp;
 136         struct rpc_tstream_next_vector_state next_vector;
 137         ssize_t nread;
 138 };
 139
 140 static void rpc_tstream_read_done(struct tevent_req *subreq);
 141
 142 static struct tevent_req *rpc_tstream_read_send(TALLOC_CTX *mem_ctx,
 143                                              struct tevent_context *ev,
 144                                              uint8_t *data, size_t size,
 145                                              void *priv)
 146 {
 147         struct rpc_tstream_state *transp =
 148                 talloc_get_type_abort(priv, struct rpc_tstream_state);
 149         struct tevent_req *req, *subreq;
 150         struct rpc_tstream_read_state *state;
 151         struct timeval endtime;
 152
 153         req = tevent_req_create(mem_ctx, &state, struct rpc_tstream_read_state);
 154         if (req == NULL) {
 155                 return NULL;
 156         }
 157         if (!rpc_tstream_is_connected(transp)) {
 158                 NTSTATUS status = NT_STATUS_CONNECTION_DISCONNECTED;
 159                 if (tstream_is_smbXcli_np(transp->stream)) {
 160                         status = NT_STATUS_PIPE_DISCONNECTED;
 161                 }
 162                 tevent_req_nterror(req, status);
 163                 return tevent_req_post(req, ev);
 164         }
 165         state->transp = transp;
 166         rpc_tstream_next_vector_init(&state->next_vector, data, size);
 167
 168         subreq = tstream_readv_pdu_queue_send(state, ev,
 169                                               transp->stream,
 170                                               transp->read_queue,
 171                                               rpc_tstream_next_vector,
 172                                               &state->next_vector);
 173         if (subreq == NULL) {
 174                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 175                 return tevent_req_post(req, ev);
 176         }
 177
 178         endtime = timeval_current_ofs_msec(transp->timeout);
 179         if (!tevent_req_set_endtime(subreq, ev, endtime)) {
 180                 goto fail;
 181         }
 182
 183         tevent_req_set_callback(subreq, rpc_tstream_read_done, req);
 184         return req;
 185  fail:
 186         TALLOC_FREE(req);
 187         return NULL;
 188 }
 189
 190 static void rpc_tstream_read_done(struct tevent_req *subreq)
 191 {
 192         struct tevent_req *req =
 193                 tevent_req_callback_data(subreq, struct tevent_req);
 194         struct rpc_tstream_read_state *state =
 195                 tevent_req_data(req, struct rpc_tstream_read_state);
 196         int err;
 197
 198         state->nread = tstream_readv_pdu_queue_recv(subreq, &err);
 199         TALLOC_FREE(subreq);
 200         if (state->nread < 0) {
 201                 rpc_tstream_disconnect(state->transp);
 202                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 203                 return;
 204         }
 205         tevent_req_done(req);
 206 }
 207
 208 static NTSTATUS rpc_tstream_read_recv(struct tevent_req *req, ssize_t *size)
 209 {
 210         struct rpc_tstream_read_state *state = tevent_req_data(
 211                 req, struct rpc_tstream_read_state);
 212         NTSTATUS status;
 213
 214         if (tevent_req_is_nterror(req, &status)) {
 215                 return status;
 216         }
 217         *size = state->nread;
 218         return NT_STATUS_OK;
 219 }
 220
 221 struct rpc_tstream_write_state {
 222         struct tevent_context *ev;
 223         struct rpc_tstream_state *transp;
 224         struct iovec iov;
 225         ssize_t nwritten;
 226 };
 227
 228 static void rpc_tstream_write_done(struct tevent_req *subreq);
 229
 230 static struct tevent_req *rpc_tstream_write_send(TALLOC_CTX *mem_ctx,
 231                                               struct tevent_context *ev,
 232                                               const uint8_t *data, size_t size,
 233                                               void *priv)
 234 {
 235         struct rpc_tstream_state *transp =
 236                 talloc_get_type_abort(priv, struct rpc_tstream_state);
 237         struct tevent_req *req, *subreq;
 238         struct rpc_tstream_write_state *state;
 239         struct timeval endtime;
 240
 241         req = tevent_req_create(mem_ctx, &state, struct rpc_tstream_write_state);
 242         if (req == NULL) {
 243                 return NULL;
 244         }
 245         if (!rpc_tstream_is_connected(transp)) {
 246                 NTSTATUS status = NT_STATUS_CONNECTION_DISCONNECTED;
 247                 if (tstream_is_smbXcli_np(transp->stream)) {
 248                         status = NT_STATUS_PIPE_DISCONNECTED;
 249                 }
 250                 tevent_req_nterror(req, status);
 251                 return tevent_req_post(req, ev);
 252         }
 253         state->ev = ev;
 254         state->transp = transp;
 255         state->iov.iov_base = discard_const_p(void *, data);
 256         state->iov.iov_len = size;
 257
 258         subreq = tstream_writev_queue_send(state, ev,
 259                                            transp->stream,
 260                                            transp->write_queue,
 261                                            &state->iov, 1);
 262         if (subreq == NULL) {
 263                 goto fail;
 264         }
 265
 266         endtime = timeval_current_ofs_msec(transp->timeout);
 267         if (!tevent_req_set_endtime(subreq, ev, endtime)) {
 268                 goto fail;
 269         }
 270
 271         tevent_req_set_callback(subreq, rpc_tstream_write_done, req);
 272         return req;
 273  fail:
 274         TALLOC_FREE(req);
 275         return NULL;
 276 }
 277
 278 static void rpc_tstream_write_done(struct tevent_req *subreq)
 279 {
 280         struct tevent_req *req =
 281                 tevent_req_callback_data(subreq, struct tevent_req);
 282         struct rpc_tstream_write_state *state =
 283                 tevent_req_data(req, struct rpc_tstream_write_state);
 284         int err;
 285
 286         state->nwritten = tstream_writev_queue_recv(subreq, &err);
 287         TALLOC_FREE(subreq);
 288         if (state->nwritten < 0) {
 289                 rpc_tstream_disconnect(state->transp);
 290                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 291                 return;
 292         }
 293         tevent_req_done(req);
 294 }
 295
 296 static NTSTATUS rpc_tstream_write_recv(struct tevent_req *req, ssize_t *sent)
 297 {
 298         struct rpc_tstream_write_state *state =
 299                 tevent_req_data(req, struct rpc_tstream_write_state);
 300         NTSTATUS status;
 301
 302         if (tevent_req_is_nterror(req, &status)) {
 303                 return status;
 304         }
 305         *sent = state->nwritten;
 306         return NT_STATUS_OK;
 307 }
 308
 309 struct rpc_tstream_trans_state {
 310         struct tevent_context *ev;
 311         struct rpc_tstream_state *transp;
 312         struct iovec req;
 313         uint32_t max_rdata_len;
 314         struct iovec rep;
 315 };
 316
 317 static void rpc_tstream_trans_writev(struct tevent_req *subreq);
 318 static void rpc_tstream_trans_readv_pdu(struct tevent_req *subreq);
 319
 320 static int rpc_tstream_trans_next_vector(struct tstream_context *stream,
 321                                          void *private_data,
 322                                          TALLOC_CTX *mem_ctx,
 323                                          struct iovec **_vector,
 324                                          size_t *count);
 325
 326 static struct tevent_req *rpc_tstream_trans_send(TALLOC_CTX *mem_ctx,
 327                                                  struct tevent_context *ev,
 328                                                  const uint8_t *data, size_t data_len,
 329                                                  uint32_t max_rdata_len,
 330                                                  void *priv)
 331 {
 332         struct rpc_tstream_state *transp =
 333                 talloc_get_type_abort(priv, struct rpc_tstream_state);
 334         struct tevent_req *req, *subreq;
 335         struct rpc_tstream_trans_state *state;
 336         struct timeval endtime;
 337         bool use_trans = false;
 338
 339         req = tevent_req_create(mem_ctx, &state,
 340                                 struct rpc_tstream_trans_state);
 341         if (req == NULL) {
 342                 return NULL;
 343         }
 344
 345         if (!rpc_tstream_is_connected(transp)) {
 346                 NTSTATUS status = NT_STATUS_CONNECTION_DISCONNECTED;
 347                 if (tstream_is_smbXcli_np(transp->stream)) {
 348                         status = NT_STATUS_PIPE_DISCONNECTED;
 349                 }
 350                 tevent_req_nterror(req, status);
 351                 return tevent_req_post(req, ev);
 352         }
 353         state->ev = ev;
 354         state->transp = transp;
 355         state->req.iov_len = data_len;
 356         state->req.iov_base = discard_const_p(void *, data);
 357         state->max_rdata_len = max_rdata_len;
 358
 359         endtime = timeval_current_ofs_msec(transp->timeout);
 360
 361         if (tstream_is_smbXcli_np(transp->stream)) {
 362                 use_trans = true;
 363         }
 364         if (tevent_queue_length(transp->write_queue) > 0) {
 365                 use_trans = false;
 366         }
 367         if (tevent_queue_length(transp->read_queue) > 0) {
 368                 use_trans = false;
 369         }
 370
 371         if (use_trans) {
 372                 tstream_smbXcli_np_use_trans(transp->stream);
 373         }
 374
 375         subreq = tstream_writev_queue_send(state, ev,
 376                                            transp->stream,
 377                                            transp->write_queue,
 378                                            &state->req, 1);
 379         if (tevent_req_nomem(subreq, req)) {
 380                 return tevent_req_post(req, ev);
 381         }
 382         if (!tevent_req_set_endtime(subreq, ev, endtime)) {
 383                 return tevent_req_post(req, ev);
 384         }
 385         tevent_req_set_callback(subreq, rpc_tstream_trans_writev, req);
 386
 387         subreq = tstream_readv_pdu_queue_send(state, ev,
 388                                               transp->stream,
 389                                               transp->read_queue,
 390                                               rpc_tstream_trans_next_vector,
 391                                               state);
 392         if (tevent_req_nomem(subreq, req)) {
 393                 return tevent_req_post(req, ev);
 394         }
 395         if (!tevent_req_set_endtime(subreq, ev, endtime)) {
 396                 return tevent_req_post(req, ev);
 397         }
 398         tevent_req_set_callback(subreq, rpc_tstream_trans_readv_pdu, req);
 399
 400         return req;
 401 }
 402
 403 static void rpc_tstream_trans_writev(struct tevent_req *subreq)
 404 {
 405         struct tevent_req *req =
 406                 tevent_req_callback_data(subreq,
 407                 struct tevent_req);
 408         struct rpc_tstream_trans_state *state =
 409                 tevent_req_data(req,
 410                 struct rpc_tstream_trans_state);
 411         int ret;
 412         int err;
 413
 414         ret = tstream_writev_queue_recv(subreq, &err);
 415         TALLOC_FREE(subreq);
 416         if (ret == -1) {
 417                 rpc_tstream_disconnect(state->transp);
 418                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 419                 return;
 420         }
 421 }
 422
 423 static int rpc_tstream_trans_next_vector(struct tstream_context *stream,
 424                                          void *private_data,
 425                                          TALLOC_CTX *mem_ctx,
 426                                          struct iovec **_vector,
 427                                          size_t *count)
 428 {
 429         struct rpc_tstream_trans_state *state =
 430                 talloc_get_type_abort(private_data,
 431                 struct rpc_tstream_trans_state);
 432         struct iovec *vector;
 433
 434         if (state->max_rdata_len == state->rep.iov_len) {
 435                 *_vector = NULL;
 436                 *count = 0;
 437                 return 0;
 438         }
 439
 440         state->rep.iov_base = talloc_array(state, uint8_t,
 441                                            state->max_rdata_len);
 442         if (state->rep.iov_base == NULL) {
 443                 return -1;
 444         }
 445         state->rep.iov_len = state->max_rdata_len;
 446
 447         vector = talloc_array(mem_ctx, struct iovec, 1);
 448         if (!vector) {
 449                 return -1;
 450         }
 451
 452         vector[0] = state->rep;
 453
 454         *_vector = vector;
 455         *count = 1;
 456         return 0;
 457 }
 458
 459 static void rpc_tstream_trans_readv_pdu(struct tevent_req *subreq)
 460 {
 461         struct tevent_req *req =
 462                 tevent_req_callback_data(subreq,
 463                 struct tevent_req);
 464         struct rpc_tstream_trans_state *state =
 465                 tevent_req_data(req,
 466                 struct rpc_tstream_trans_state);
 467         int ret;
 468         int err;
 469
 470         ret = tstream_readv_pdu_queue_recv(subreq, &err);
 471         TALLOC_FREE(subreq);
 472         if (ret == -1) {
 473                 rpc_tstream_disconnect(state->transp);
 474                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 475                 return;
 476         }
 477
 478         tevent_req_done(req);
 479 }
 480
 481 static NTSTATUS rpc_tstream_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 482                                        uint8_t **prdata, uint32_t *prdata_len)
 483 {
 484         struct rpc_tstream_trans_state *state =
 485                 tevent_req_data(req,
 486                 struct rpc_tstream_trans_state);
 487         NTSTATUS status;
 488
 489         if (tevent_req_is_nterror(req, &status)) {
 490                 return status;
 491         }
 492
 493         *prdata = (uint8_t *)talloc_move(mem_ctx, &state->rep.iov_base);
 494         *prdata_len = state->rep.iov_len;
 495         return NT_STATUS_OK;
 496 }
 497
 498 /**
 499 * @brief Initialize a tstream transport facility
 500 *        NOTE: this function will talloc_steal, the stream and the queues.
 501 *
 502 * @param mem_ctx        - memory context used to allocate the transport
 503 * @param stream         - a ready to use tstream
 504 * @param presult        - the transport structure
 505 *
 506 * @return               - a NT Status error code.
 507 */
 508 NTSTATUS rpc_transport_tstream_init(TALLOC_CTX *mem_ctx,
 509                                 struct tstream_context **stream,
 510                                 struct rpc_cli_transport **presult)
 511 {
 512         struct rpc_cli_transport *result;
 513         struct rpc_tstream_state *state;
 514
 515         result = talloc(mem_ctx, struct rpc_cli_transport);
 516         if (result == NULL) {
 517                 return NT_STATUS_NO_MEMORY;
 518         }
 519         state = talloc(result, struct rpc_tstream_state);
 520         if (state == NULL) {
 521                 TALLOC_FREE(result);
 522                 return NT_STATUS_NO_MEMORY;
 523         }
 524         result->priv = state;
 525
 526         state->read_queue = tevent_queue_create(state, "read_queue");
 527         if (state->read_queue == NULL) {
 528                 TALLOC_FREE(result);
 529                 return NT_STATUS_NO_MEMORY;
 530         }
 531         state->write_queue = tevent_queue_create(state, "write_queue");
 532         if (state->write_queue == NULL) {
 533                 TALLOC_FREE(result);
 534                 return NT_STATUS_NO_MEMORY;
 535         }
 536
 537         state->stream = talloc_move(state, stream);
 538         state->timeout = 10000; /* 10 seconds. */
 539
 540         if (tstream_is_smbXcli_np(state->stream)) {
 541                 result->trans_send = rpc_tstream_trans_send;
 542                 result->trans_recv = rpc_tstream_trans_recv;
 543         } else {
 544                 result->trans_send = NULL;
 545                 result->trans_recv = NULL;
 546         }
 547         result->write_send = rpc_tstream_write_send;
 548         result->write_recv = rpc_tstream_write_recv;
 549         result->read_send = rpc_tstream_read_send;
 550         result->read_recv = rpc_tstream_read_recv;
 551         result->is_connected = rpc_tstream_is_connected;
 552         result->set_timeout = rpc_tstream_set_timeout;
 553
 554         *presult = result;
 555         return NT_STATUS_OK;
 556 }