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 "libsmb/cli_np_tstream.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_cli_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_cli_np(transp->stream)) {
  77                 transp->timeout = timeout;
  78                 return tstream_cli_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         size_t remaining;
  93 };
  94
  95 static void rpc_tstream_next_vector_init(
  96                                 struct rpc_tstream_next_vector_state *s,
  97                                 uint8_t *buf, size_t len)
  98 {
  99         ZERO_STRUCTP(s);
 100
 101         s->buf = buf;
 102         s->len = MIN(len, UINT16_MAX);
 103 }
 104
 105 static int rpc_tstream_next_vector(struct tstream_context *stream,
 106                                    void *private_data,
 107                                    TALLOC_CTX *mem_ctx,
 108                                    struct iovec **_vector,
 109                                    size_t *count)
 110 {
 111         struct rpc_tstream_next_vector_state *state =
 112                 (struct rpc_tstream_next_vector_state *)private_data;
 113         struct iovec *vector;
 114         ssize_t pending;
 115         size_t wanted;
 116
 117         if (state->ofs == state->len) {
 118                 *_vector = NULL;
 119                 *count = 0;
 120                 return 0;
 121         }
 122
 123         pending = tstream_pending_bytes(stream);
 124         if (pending == -1) {
 125                 return -1;
 126         }
 127
 128         if (pending == 0 && state->ofs != 0) {
 129                 /* return a short read */
 130                 *_vector = NULL;
 131                 *count = 0;
 132                 return 0;
 133         }
 134
 135         if (pending == 0) {
 136                 /* we want at least one byte and recheck again */
 137                 wanted = 1;
 138         } else {
 139                 size_t missing = state->len - state->ofs;
 140                 if (pending > missing) {
 141                         /* there's more available */
 142                         state->remaining = pending - missing;
 143                         wanted = missing;
 144                 } else {
 145                         /* read what we can get and recheck in the next cycle */
 146                         wanted = pending;
 147                 }
 148         }
 149
 150         vector = talloc_array(mem_ctx, struct iovec, 1);
 151         if (!vector) {
 152                 return -1;
 153         }
 154
 155         vector[0].iov_base = state->buf + state->ofs;
 156         vector[0].iov_len = wanted;
 157
 158         state->ofs += wanted;
 159
 160         *_vector = vector;
 161         *count = 1;
 162         return 0;
 163 }
 164
 165 struct rpc_tstream_read_state {
 166         struct rpc_tstream_state *transp;
 167         struct rpc_tstream_next_vector_state next_vector;
 168         ssize_t nread;
 169 };
 170
 171 static void rpc_tstream_read_done(struct tevent_req *subreq);
 172
 173 static struct tevent_req *rpc_tstream_read_send(TALLOC_CTX *mem_ctx,
 174                                              struct event_context *ev,
 175                                              uint8_t *data, size_t size,
 176                                              void *priv)
 177 {
 178         struct rpc_tstream_state *transp =
 179                 talloc_get_type_abort(priv, struct rpc_tstream_state);
 180         struct tevent_req *req, *subreq;
 181         struct rpc_tstream_read_state *state;
 182         struct timeval endtime;
 183
 184         req = tevent_req_create(mem_ctx, &state, struct rpc_tstream_read_state);
 185         if (req == NULL) {
 186                 return NULL;
 187         }
 188         if (!rpc_tstream_is_connected(transp)) {
 189                 tevent_req_nterror(req, NT_STATUS_CONNECTION_INVALID);
 190                 return tevent_req_post(req, ev);
 191         }
 192         state->transp = transp;
 193         rpc_tstream_next_vector_init(&state->next_vector, data, size);
 194
 195         subreq = tstream_readv_pdu_queue_send(state, ev,
 196                                               transp->stream,
 197                                               transp->read_queue,
 198                                               rpc_tstream_next_vector,
 199                                               &state->next_vector);
 200         if (subreq == NULL) {
 201                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 202                 return tevent_req_post(req, ev);
 203         }
 204
 205         endtime = timeval_current_ofs_msec(transp->timeout);
 206         if (!tevent_req_set_endtime(subreq, ev, endtime)) {
 207                 goto fail;
 208         }
 209
 210         tevent_req_set_callback(subreq, rpc_tstream_read_done, req);
 211         return req;
 212  fail:
 213         TALLOC_FREE(req);
 214         return NULL;
 215 }
 216
 217 static void rpc_tstream_read_done(struct tevent_req *subreq)
 218 {
 219         struct tevent_req *req =
 220                 tevent_req_callback_data(subreq, struct tevent_req);
 221         struct rpc_tstream_read_state *state =
 222                 tevent_req_data(req, struct rpc_tstream_read_state);
 223         int err;
 224
 225         state->nread = tstream_readv_pdu_queue_recv(subreq, &err);
 226         TALLOC_FREE(subreq);
 227         if (state->nread < 0) {
 228                 rpc_tstream_disconnect(state->transp);
 229                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 230                 return;
 231         }
 232         tevent_req_done(req);
 233 }
 234
 235 static NTSTATUS rpc_tstream_read_recv(struct tevent_req *req, ssize_t *size)
 236 {
 237         struct rpc_tstream_read_state *state = tevent_req_data(
 238                 req, struct rpc_tstream_read_state);
 239         NTSTATUS status;
 240
 241         if (tevent_req_is_nterror(req, &status)) {
 242                 return status;
 243         }
 244         *size = state->nread;
 245         return NT_STATUS_OK;
 246 }
 247
 248 struct rpc_tstream_write_state {
 249         struct event_context *ev;
 250         struct rpc_tstream_state *transp;
 251         struct iovec iov;
 252         ssize_t nwritten;
 253 };
 254
 255 static void rpc_tstream_write_done(struct tevent_req *subreq);
 256
 257 static struct tevent_req *rpc_tstream_write_send(TALLOC_CTX *mem_ctx,
 258                                               struct event_context *ev,
 259                                               const uint8_t *data, size_t size,
 260                                               void *priv)
 261 {
 262         struct rpc_tstream_state *transp =
 263                 talloc_get_type_abort(priv, struct rpc_tstream_state);
 264         struct tevent_req *req, *subreq;
 265         struct rpc_tstream_write_state *state;
 266         struct timeval endtime;
 267
 268         req = tevent_req_create(mem_ctx, &state, struct rpc_tstream_write_state);
 269         if (req == NULL) {
 270                 return NULL;
 271         }
 272         if (!rpc_tstream_is_connected(transp)) {
 273                 tevent_req_nterror(req, NT_STATUS_CONNECTION_INVALID);
 274                 return tevent_req_post(req, ev);
 275         }
 276         state->ev = ev;
 277         state->transp = transp;
 278         state->iov.iov_base = discard_const_p(void *, data);
 279         state->iov.iov_len = size;
 280
 281         subreq = tstream_writev_queue_send(state, ev,
 282                                            transp->stream,
 283                                            transp->write_queue,
 284                                            &state->iov, 1);
 285         if (subreq == NULL) {
 286                 goto fail;
 287         }
 288
 289         endtime = timeval_current_ofs_msec(transp->timeout);
 290         if (!tevent_req_set_endtime(subreq, ev, endtime)) {
 291                 goto fail;
 292         }
 293
 294         tevent_req_set_callback(subreq, rpc_tstream_write_done, req);
 295         return req;
 296  fail:
 297         TALLOC_FREE(req);
 298         return NULL;
 299 }
 300
 301 static void rpc_tstream_write_done(struct tevent_req *subreq)
 302 {
 303         struct tevent_req *req =
 304                 tevent_req_callback_data(subreq, struct tevent_req);
 305         struct rpc_tstream_write_state *state =
 306                 tevent_req_data(req, struct rpc_tstream_write_state);
 307         int err;
 308
 309         state->nwritten = tstream_writev_queue_recv(subreq, &err);
 310         TALLOC_FREE(subreq);
 311         if (state->nwritten < 0) {
 312                 rpc_tstream_disconnect(state->transp);
 313                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 314                 return;
 315         }
 316         tevent_req_done(req);
 317 }
 318
 319 static NTSTATUS rpc_tstream_write_recv(struct tevent_req *req, ssize_t *sent)
 320 {
 321         struct rpc_tstream_write_state *state =
 322                 tevent_req_data(req, struct rpc_tstream_write_state);
 323         NTSTATUS status;
 324
 325         if (tevent_req_is_nterror(req, &status)) {
 326                 return status;
 327         }
 328         *sent = state->nwritten;
 329         return NT_STATUS_OK;
 330 }
 331
 332 struct rpc_tstream_trans_state {
 333         struct tevent_context *ev;
 334         struct rpc_tstream_state *transp;
 335         struct iovec req;
 336         uint32_t max_rdata_len;
 337         struct iovec rep;
 338 };
 339
 340 static void rpc_tstream_trans_writev(struct tevent_req *subreq);
 341 static void rpc_tstream_trans_readv_pdu(struct tevent_req *subreq);
 342
 343 static int rpc_tstream_trans_next_vector(struct tstream_context *stream,
 344                                          void *private_data,
 345                                          TALLOC_CTX *mem_ctx,
 346                                          struct iovec **_vector,
 347                                          size_t *count);
 348
 349 static struct tevent_req *rpc_tstream_trans_send(TALLOC_CTX *mem_ctx,
 350                                                  struct tevent_context *ev,
 351                                                  uint8_t *data, size_t data_len,
 352                                                  uint32_t max_rdata_len,
 353                                                  void *priv)
 354 {
 355         struct rpc_tstream_state *transp =
 356                 talloc_get_type_abort(priv, struct rpc_tstream_state);
 357         struct tevent_req *req, *subreq;
 358         struct rpc_tstream_trans_state *state;
 359         struct timeval endtime;
 360
 361         req = tevent_req_create(mem_ctx, &state,
 362                                 struct rpc_tstream_trans_state);
 363         if (req == NULL) {
 364                 return NULL;
 365         }
 366
 367         if (!rpc_tstream_is_connected(transp)) {
 368                 tevent_req_nterror(req, NT_STATUS_CONNECTION_INVALID);
 369                 return tevent_req_post(req, ev);
 370         }
 371         state->ev = ev;
 372         state->transp = transp;
 373         state->req.iov_len = data_len;
 374         state->req.iov_base = discard_const_p(void *, data);
 375         state->max_rdata_len = max_rdata_len;
 376
 377         endtime = timeval_current_ofs_msec(transp->timeout);
 378
 379         subreq = tstream_writev_queue_send(state, ev,
 380                                            transp->stream,
 381                                            transp->write_queue,
 382                                            &state->req, 1);
 383         if (tevent_req_nomem(subreq, req)) {
 384                 return tevent_req_post(req, ev);
 385         }
 386         if (!tevent_req_set_endtime(subreq, ev, endtime)) {
 387                 return tevent_req_post(req, ev);
 388         }
 389         tevent_req_set_callback(subreq, rpc_tstream_trans_writev, req);
 390
 391         if (tstream_is_cli_np(transp->stream)) {
 392                 tstream_cli_np_use_trans(transp->stream);
 393         }
 394
 395         subreq = tstream_readv_pdu_queue_send(state, ev,
 396                                               transp->stream,
 397                                               transp->read_queue,
 398                                               rpc_tstream_trans_next_vector,
 399                                               state);
 400         if (tevent_req_nomem(subreq, req)) {
 401                 return tevent_req_post(req, ev);
 402         }
 403         if (!tevent_req_set_endtime(subreq, ev, endtime)) {
 404                 return tevent_req_post(req, ev);
 405         }
 406         tevent_req_set_callback(subreq, rpc_tstream_trans_readv_pdu, req);
 407
 408         return req;
 409 }
 410
 411 static void rpc_tstream_trans_writev(struct tevent_req *subreq)
 412 {
 413         struct tevent_req *req =
 414                 tevent_req_callback_data(subreq,
 415                 struct tevent_req);
 416         struct rpc_tstream_trans_state *state =
 417                 tevent_req_data(req,
 418                 struct rpc_tstream_trans_state);
 419         int ret;
 420         int err;
 421
 422         ret = tstream_writev_queue_recv(subreq, &err);
 423         TALLOC_FREE(subreq);
 424         if (ret == -1) {
 425                 rpc_tstream_disconnect(state->transp);
 426                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 427                 return;
 428         }
 429 }
 430
 431 static int rpc_tstream_trans_next_vector(struct tstream_context *stream,
 432                                          void *private_data,
 433                                          TALLOC_CTX *mem_ctx,
 434                                          struct iovec **_vector,
 435                                          size_t *count)
 436 {
 437         struct rpc_tstream_trans_state *state =
 438                 talloc_get_type_abort(private_data,
 439                 struct rpc_tstream_trans_state);
 440         struct iovec *vector;
 441
 442         if (state->max_rdata_len == state->rep.iov_len) {
 443                 *_vector = NULL;
 444                 *count = 0;
 445                 return 0;
 446         }
 447
 448         state->rep.iov_base = talloc_array(state, uint8_t,
 449                                            state->max_rdata_len);
 450         if (state->rep.iov_base == NULL) {
 451                 return -1;
 452         }
 453         state->rep.iov_len = state->max_rdata_len;
 454
 455         vector = talloc_array(mem_ctx, struct iovec, 1);
 456         if (!vector) {
 457                 return -1;
 458         }
 459
 460         vector[0] = state->rep;
 461
 462         *_vector = vector;
 463         *count = 1;
 464         return 0;
 465 }
 466
 467 static void rpc_tstream_trans_readv_pdu(struct tevent_req *subreq)
 468 {
 469         struct tevent_req *req =
 470                 tevent_req_callback_data(subreq,
 471                 struct tevent_req);
 472         struct rpc_tstream_trans_state *state =
 473                 tevent_req_data(req,
 474                 struct rpc_tstream_trans_state);
 475         int ret;
 476         int err;
 477
 478         ret = tstream_readv_pdu_queue_recv(subreq, &err);
 479         TALLOC_FREE(subreq);
 480         if (ret == -1) {
 481                 rpc_tstream_disconnect(state->transp);
 482                 tevent_req_nterror(req, map_nt_error_from_unix(err));
 483                 return;
 484         }
 485
 486         tevent_req_done(req);
 487 }
 488
 489 static NTSTATUS rpc_tstream_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 490                                        uint8_t **prdata, uint32_t *prdata_len)
 491 {
 492         struct rpc_tstream_trans_state *state =
 493                 tevent_req_data(req,
 494                 struct rpc_tstream_trans_state);
 495         NTSTATUS status;
 496
 497         if (tevent_req_is_nterror(req, &status)) {
 498                 return status;
 499         }
 500
 501         *prdata = (uint8_t *)talloc_move(mem_ctx, &state->rep.iov_base);
 502         *prdata_len = state->rep.iov_len;
 503         return NT_STATUS_OK;
 504 }
 505
 506 /**
 507 * @brief Initialize a tstream transport facility
 508 *        NOTE: this function will talloc_steal, the stream and the queues.
 509 *
 510 * @param mem_ctx        - memory context used to allocate the transport
 511 * @param stream         - a ready to use tstream
 512 * @param presult        - the transport structure
 513 *
 514 * @return               - a NT Status error code.
 515 */
 516 NTSTATUS rpc_transport_tstream_init(TALLOC_CTX *mem_ctx,
 517                                 struct tstream_context **stream,
 518                                 struct rpc_cli_transport **presult)
 519 {
 520         struct rpc_cli_transport *result;
 521         struct rpc_tstream_state *state;
 522
 523         result = talloc(mem_ctx, struct rpc_cli_transport);
 524         if (result == NULL) {
 525                 return NT_STATUS_NO_MEMORY;
 526         }
 527         state = talloc(result, struct rpc_tstream_state);
 528         if (state == NULL) {
 529                 TALLOC_FREE(result);
 530                 return NT_STATUS_NO_MEMORY;
 531         }
 532         result->priv = state;
 533
 534         state->read_queue = tevent_queue_create(state, "read_queue");
 535         if (state->read_queue == NULL) {
 536                 TALLOC_FREE(result);
 537                 return NT_STATUS_NO_MEMORY;
 538         }
 539         state->write_queue = tevent_queue_create(state, "write_queue");
 540         if (state->write_queue == NULL) {
 541                 TALLOC_FREE(result);
 542                 return NT_STATUS_NO_MEMORY;
 543         }
 544
 545         state->stream = talloc_move(state, stream);
 546         state->timeout = 10000; /* 10 seconds. */
 547
 548         if (tstream_is_cli_np(state->stream)) {
 549                 result->trans_send = rpc_tstream_trans_send;
 550                 result->trans_recv = rpc_tstream_trans_recv;
 551         } else {
 552                 result->trans_send = NULL;
 553                 result->trans_recv = NULL;
 554         }
 555         result->write_send = rpc_tstream_write_send;
 556         result->write_recv = rpc_tstream_write_recv;
 557         result->read_send = rpc_tstream_read_send;
 558         result->read_recv = rpc_tstream_read_recv;
 559         result->is_connected = rpc_tstream_is_connected;
 560         result->set_timeout = rpc_tstream_set_timeout;
 561
 562         *presult = result;
 563         return NT_STATUS_OK;
 564 }
 565
 566 struct cli_state *rpc_pipe_np_smb_conn(struct rpc_pipe_client *p)
 567 {
 568         struct rpc_tstream_state *transp =
 569                 talloc_get_type_abort(p->transport->priv,
 570                 struct rpc_tstream_state);
 571         bool ok;
 572
 573         ok = rpccli_is_connected(p);
 574         if (!ok) {
 575                 return NULL;
 576         }
 577
 578         if (!tstream_is_cli_np(transp->stream)) {
 579                 return NULL;
 580         }
 581
 582         return tstream_cli_np_get_cli_state(transp->stream);
 583 }