source4/wrepl_server/wrepl_in_connection.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    WINS Replication server
   5
   6    Copyright (C) Stefan Metzmacher      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 "lib/socket/socket.h"
  24 #include "lib/stream/packet.h"
  25 #include "smbd/service_task.h"
  26 #include "smbd/service_stream.h"
  27 #include "smbd/service.h"
  28 #include "lib/messaging/irpc.h"
  29 #include "librpc/gen_ndr/ndr_winsrepl.h"
  30 #include "wrepl_server/wrepl_server.h"
  31 #include "smbd/process_model.h"
  32 #include "system/network.h"
  33 #include "lib/socket/netif.h"
  34 #include "lib/tsocket/tsocket.h"
  35 #include "libcli/util/tstream.h"
  36 #include "param/param.h"
  37
  38 void wreplsrv_terminate_in_connection(struct wreplsrv_in_connection *wreplconn, const char *reason)
  39 {
  40         stream_terminate_connection(wreplconn->conn, reason);
  41 }
  42
  43 /*
  44   receive some data on a WREPL connection
  45 */
  46 static NTSTATUS wreplsrv_process(struct wreplsrv_in_connection *wrepl_conn,
  47                                  struct wreplsrv_in_call **_call)
  48 {
  49         struct wrepl_wrap packet_out_wrap;
  50         NTSTATUS status;
  51         enum ndr_err_code ndr_err;
  52         struct wreplsrv_in_call *call = *_call;
  53
  54         ndr_err = ndr_pull_struct_blob(&call->in, call,
  55                                        &call->req_packet,
  56                                        (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
  57         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  58                 return ndr_map_error2ntstatus(ndr_err);
  59         }
  60
  61         if (DEBUGLVL(10)) {
  62                 DEBUG(10,("Received WINS-Replication packet of length %u\n",
  63                           (unsigned int) call->in.length + 4));
  64                 NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet);
  65         }
  66
  67         status = wreplsrv_in_call(call);
  68         NT_STATUS_IS_ERR_RETURN(status);
  69         if (!NT_STATUS_IS_OK(status)) {
  70                 /* w2k just ignores invalid packets, so we do */
  71                 DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n"));
  72                 TALLOC_FREE(call);
  73                 *_call = NULL;
  74                 return NT_STATUS_OK;
  75         }
  76
  77         /* and now encode the reply */
  78         packet_out_wrap.packet = call->rep_packet;
  79         ndr_err = ndr_push_struct_blob(&call->out, call,
  80                                        &packet_out_wrap,
  81                                        (ndr_push_flags_fn_t) ndr_push_wrepl_wrap);
  82         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  83                 return ndr_map_error2ntstatus(ndr_err);
  84         }
  85
  86         if (DEBUGLVL(10)) {
  87                 DEBUG(10,("Sending WINS-Replication packet of length %u\n",
  88                          (unsigned int) call->out.length));
  89                 NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet);
  90         }
  91
  92         return NT_STATUS_OK;
  93 }
  94
  95 static void wreplsrv_call_loop(struct tevent_req *subreq);
  96
  97 /*
  98   called when we get a new connection
  99 */
 100 static void wreplsrv_accept(struct stream_connection *conn)
 101 {
 102         struct wreplsrv_service *service = talloc_get_type(conn->private_data, struct wreplsrv_service);
 103         struct wreplsrv_in_connection *wrepl_conn;
 104         struct tsocket_address *peer_addr;
 105         char *peer_ip;
 106         struct tevent_req *subreq;
 107         int rc, fd;
 108
 109         wrepl_conn = talloc_zero(conn, struct wreplsrv_in_connection);
 110         if (wrepl_conn == NULL) {
 111                 stream_terminate_connection(conn,
 112                                             "wreplsrv_accept: out of memory");
 113                 return;
 114         }
 115
 116         wrepl_conn->send_queue = tevent_queue_create(conn, "wrepl_accept");
 117         if (wrepl_conn->send_queue == NULL) {
 118                 stream_terminate_connection(conn,
 119                                             "wrepl_accept: out of memory");
 120                 return;
 121         }
 122
 123         TALLOC_FREE(conn->event.fde);
 124
 125         /*
 126          * Clone the fd that the connection isn't closed if we create a client
 127          * connection.
 128          */
 129         fd = dup(socket_get_fd(conn->socket));
 130         if (fd == -1) {
 131                 char *reason;
 132
 133                 reason = talloc_asprintf(conn,
 134                                          "wrepl_accept: failed to duplicate the file descriptor - %s",
 135                                          strerror(errno));
 136                 if (reason == NULL) {
 137                         reason = strerror(errno);
 138                 }
 139                 stream_terminate_connection(conn, reason);
 140         }
 141         rc = tstream_bsd_existing_socket(wrepl_conn,
 142                                          fd,
 143                                          &wrepl_conn->tstream);
 144         if (rc < 0) {
 145                 stream_terminate_connection(conn,
 146                                             "wrepl_accept: out of memory");
 147                 return;
 148         }
 149
 150         wrepl_conn->conn = conn;
 151         wrepl_conn->service = service;
 152
 153         peer_addr = conn->remote_address;
 154
 155         if (!tsocket_address_is_inet(peer_addr, "ipv4")) {
 156                 DEBUG(0,("wreplsrv_accept: non ipv4 peer addr '%s'\n",
 157                         tsocket_address_string(peer_addr, wrepl_conn)));
 158                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: "
 159                                 "invalid peer IP");
 160                 return;
 161         }
 162
 163         peer_ip = tsocket_address_inet_addr_string(peer_addr, wrepl_conn);
 164         if (peer_ip == NULL) {
 165                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: "
 166                                 "could not convert peer IP into a string");
 167                 return;
 168         }
 169
 170         wrepl_conn->partner = wreplsrv_find_partner(service, peer_ip);
 171         irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
 172
 173         /*
 174          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 175          * packet_full_request_u32 provides the pdu length then.
 176          */
 177         subreq = tstream_read_pdu_blob_send(wrepl_conn,
 178                                             wrepl_conn->conn->event.ctx,
 179                                             wrepl_conn->tstream,
 180                                             4, /* initial_read_size */
 181                                             packet_full_request_u32,
 182                                             wrepl_conn);
 183         if (subreq == NULL) {
 184                 wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_accept: "
 185                                 "no memory for tstream_read_pdu_blob_send");
 186                 return;
 187         }
 188         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn);
 189 }
 190
 191 static void wreplsrv_call_writev_done(struct tevent_req *subreq);
 192
 193 static void wreplsrv_call_loop(struct tevent_req *subreq)
 194 {
 195         struct wreplsrv_in_connection *wrepl_conn = tevent_req_callback_data(subreq,
 196                                       struct wreplsrv_in_connection);
 197         struct wreplsrv_in_call *call;
 198         NTSTATUS status;
 199
 200         call = talloc_zero(wrepl_conn, struct wreplsrv_in_call);
 201         if (call == NULL) {
 202                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 203                                 "no memory for wrepl_samba3_call");
 204                 return;
 205         }
 206         call->wreplconn = wrepl_conn;
 207
 208         status = tstream_read_pdu_blob_recv(subreq,
 209                                             call,
 210                                             &call->in);
 211         TALLOC_FREE(subreq);
 212         if (!NT_STATUS_IS_OK(status)) {
 213                 const char *reason;
 214
 215                 reason = talloc_asprintf(call, "wreplsrv_call_loop: "
 216                                          "tstream_read_pdu_blob_recv() - %s",
 217                                          nt_errstr(status));
 218                 if (!reason) {
 219                         reason = nt_errstr(status);
 220                 }
 221
 222                 wreplsrv_terminate_in_connection(wrepl_conn, reason);
 223                 return;
 224         }
 225
 226         DEBUG(10,("Received wrepl packet of length %lu from %s\n",
 227                  (long) call->in.length,
 228                  tsocket_address_string(wrepl_conn->conn->remote_address, call)));
 229
 230         /* skip length header */
 231         call->in.data += 4;
 232         call->in.length -= 4;
 233
 234         status = wreplsrv_process(wrepl_conn, &call);
 235         if (!NT_STATUS_IS_OK(status)) {
 236                 const char *reason;
 237
 238                 reason = talloc_asprintf(call, "wreplsrv_call_loop: "
 239                                          "tstream_read_pdu_blob_recv() - %s",
 240                                          nt_errstr(status));
 241                 if (reason == NULL) {
 242                         reason = nt_errstr(status);
 243                 }
 244
 245                 wreplsrv_terminate_in_connection(wrepl_conn, reason);
 246                 return;
 247         }
 248
 249         /* We handed over the connection so we're done here */
 250         if (wrepl_conn->tstream == NULL) {
 251             return;
 252         }
 253
 254         /* Invalid WINS-Replication packet, we just ignore it */
 255         if (call == NULL) {
 256                 goto noreply;
 257         }
 258
 259         call->out_iov[0].iov_base = call->out.data;
 260         call->out_iov[0].iov_len = call->out.length;
 261
 262         subreq = tstream_writev_queue_send(call,
 263                                            wrepl_conn->conn->event.ctx,
 264                                            wrepl_conn->tstream,
 265                                            wrepl_conn->send_queue,
 266                                            call->out_iov, 1);
 267         if (subreq == NULL) {
 268                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 269                                 "no memory for tstream_writev_queue_send");
 270                 return;
 271         }
 272         tevent_req_set_callback(subreq, wreplsrv_call_writev_done, call);
 273
 274 noreply:
 275         /*
 276          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 277          *  provides the pdu length then.
 278          */
 279         subreq = tstream_read_pdu_blob_send(wrepl_conn,
 280                                             wrepl_conn->conn->event.ctx,
 281                                             wrepl_conn->tstream,
 282                                             4, /* initial_read_size */
 283                                             packet_full_request_u32,
 284                                             wrepl_conn);
 285         if (subreq == NULL) {
 286                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 287                                 "no memory for tstream_read_pdu_blob_send");
 288                 return;
 289         }
 290         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn);
 291 }
 292
 293 static void wreplsrv_call_writev_done(struct tevent_req *subreq)
 294 {
 295         struct wreplsrv_in_call *call = tevent_req_callback_data(subreq,
 296                         struct wreplsrv_in_call);
 297         int sys_errno;
 298         int rc;
 299
 300         rc = tstream_writev_queue_recv(subreq, &sys_errno);
 301         TALLOC_FREE(subreq);
 302         if (rc == -1) {
 303                 const char *reason;
 304
 305                 reason = talloc_asprintf(call, "wreplsrv_call_writev_done: "
 306                                          "tstream_writev_queue_recv() - %d:%s",
 307                                          sys_errno, strerror(sys_errno));
 308                 if (reason == NULL) {
 309                         reason = "wreplsrv_call_writev_done: "
 310                                  "tstream_writev_queue_recv() failed";
 311                 }
 312
 313                 wreplsrv_terminate_in_connection(call->wreplconn, reason);
 314                 return;
 315         }
 316
 317         if (call->terminate_after_send) {
 318                 wreplsrv_terminate_in_connection(call->wreplconn,
 319                                 "wreplsrv_in_connection: terminate_after_send");
 320                 return;
 321         }
 322
 323         talloc_free(call);
 324 }
 325
 326 /*
 327   called on a tcp recv
 328 */
 329 static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags)
 330 {
 331         struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data,
 332                                                         struct wreplsrv_in_connection);
 333         /* this should never be triggered! */
 334         DEBUG(0,("Terminating connection - '%s'\n", "wrepl_recv: called"));
 335         wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_recv: called");
 336 }
 337
 338 /*
 339   called when we can write to a connection
 340 */
 341 static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
 342 {
 343         struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data,
 344                                                         struct wreplsrv_in_connection);
 345         /* this should never be triggered! */
 346         DEBUG(0,("Terminating connection - '%s'\n", "wrepl_send: called"));
 347         wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_send: called");
 348 }
 349
 350 static const struct stream_server_ops wreplsrv_stream_ops = {
 351         .name                   = "wreplsrv",
 352         .accept_connection      = wreplsrv_accept,
 353         .recv_handler           = wreplsrv_recv,
 354         .send_handler           = wreplsrv_send,
 355 };
 356
 357 /*
 358   called when we get a new connection
 359 */
 360 NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
 361                                       uint32_t peer_assoc_ctx,
 362                                       struct tstream_context **stream,
 363                                       struct wreplsrv_in_connection **_wrepl_in)
 364 {
 365         struct wreplsrv_service *service = partner->service;
 366         struct wreplsrv_in_connection *wrepl_in;
 367         const struct model_ops *model_ops;
 368         struct stream_connection *conn;
 369         struct tevent_req *subreq;
 370         NTSTATUS status;
 371
 372         /* within the wrepl task we want to be a single process, so
 373            ask for the single process model ops and pass these to the
 374            stream_setup_socket() call. */
 375         model_ops = process_model_startup(service->task->event_ctx, "single");
 376         if (!model_ops) {
 377                 DEBUG(0,("Can't find 'single' process model_ops"));
 378                 return NT_STATUS_INTERNAL_ERROR;
 379         }
 380
 381         wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
 382         NT_STATUS_HAVE_NO_MEMORY(wrepl_in);
 383
 384         wrepl_in->service       = service;
 385         wrepl_in->partner       = partner;
 386         wrepl_in->tstream       = talloc_move(wrepl_in, stream);
 387         wrepl_in->assoc_ctx.peer_ctx = peer_assoc_ctx;
 388
 389         status = stream_new_connection_merge(service->task->event_ctx,
 390                                              service->task->lp_ctx,
 391                                              model_ops,
 392                                              &wreplsrv_stream_ops,
 393                                              service->task->msg_ctx,
 394                                              wrepl_in,
 395                                              &conn);
 396         NT_STATUS_NOT_OK_RETURN(status);
 397
 398         /*
 399          * make the wreplsrv_in_connection structure a child of the
 400          * stream_connection, to match the hierarchy of wreplsrv_accept
 401          */
 402         wrepl_in->conn          = conn;
 403         talloc_steal(conn, wrepl_in);
 404
 405         wrepl_in->send_queue = tevent_queue_create(wrepl_in, "wreplsrv_in_connection_merge");
 406         if (wrepl_in->send_queue == NULL) {
 407                 stream_terminate_connection(conn,
 408                                             "wreplsrv_in_connection_merge: out of memory");
 409                 return NT_STATUS_NO_MEMORY;
 410         }
 411
 412         /*
 413          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 414          * packet_full_request_u32 provides the pdu length then.
 415          */
 416         subreq = tstream_read_pdu_blob_send(wrepl_in,
 417                                             wrepl_in->conn->event.ctx,
 418                                             wrepl_in->tstream,
 419                                             4, /* initial_read_size */
 420                                             packet_full_request_u32,
 421                                             wrepl_in);
 422         if (subreq == NULL) {
 423                 wreplsrv_terminate_in_connection(wrepl_in, "wreplsrv_in_connection_merge: "
 424                                 "no memory for tstream_read_pdu_blob_send");
 425                 return NT_STATUS_NO_MEMORY;
 426         }
 427         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_in);
 428
 429         *_wrepl_in = wrepl_in;
 430
 431         return NT_STATUS_OK;
 432 }
 433
 434 /*
 435   startup the wrepl port 42 server sockets
 436 */
 437 NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service, struct loadparm_context *lp_ctx)
 438 {
 439         NTSTATUS status;
 440         struct task_server *task = service->task;
 441         const struct model_ops *model_ops;
 442         const char *address;
 443         uint16_t port = WINS_REPLICATION_PORT;
 444
 445         /* within the wrepl task we want to be a single process, so
 446            ask for the single process model ops and pass these to the
 447            stream_setup_socket() call. */
 448         model_ops = process_model_startup(task->event_ctx, "single");
 449         if (!model_ops) {
 450                 DEBUG(0,("Can't find 'single' process model_ops"));
 451                 return NT_STATUS_INTERNAL_ERROR;
 452         }
 453
 454         if (lp_interfaces(lp_ctx) && lp_bind_interfaces_only(lp_ctx)) {
 455                 int num_interfaces;
 456                 int i;
 457                 struct interface *ifaces;
 458
 459                 load_interfaces(task, lp_interfaces(lp_ctx), &ifaces);
 460
 461                 num_interfaces = iface_count(ifaces);
 462
 463                 /* We have been given an interfaces line, and been
 464                    told to only bind to those interfaces. Create a
 465                    socket per interface and bind to only these.
 466                 */
 467                 for(i = 0; i < num_interfaces; i++) {
 468                         address = iface_n_ip(ifaces, i);
 469                         status = stream_setup_socket(task->event_ctx,
 470                                                      task->lp_ctx, model_ops,
 471                                                      &wreplsrv_stream_ops,
 472                                                      "ipv4", address, &port,
 473                                                       lp_socket_options(task->lp_ctx),
 474                                                      service);
 475                         if (!NT_STATUS_IS_OK(status)) {
 476                                 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 477                                          address, port, nt_errstr(status)));
 478                                 return status;
 479                         }
 480                 }
 481         } else {
 482                 address = lp_socket_address(lp_ctx);
 483                 status = stream_setup_socket(task->event_ctx, task->lp_ctx,
 484                                              model_ops, &wreplsrv_stream_ops,
 485                                              "ipv4", address, &port, lp_socket_options(task->lp_ctx),
 486                                              service);
 487                 if (!NT_STATUS_IS_OK(status)) {
 488                         DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 489                                  address, port, nt_errstr(status)));
 490                         return status;
 491                 }
 492         }
 493
 494         return NT_STATUS_OK;
 495 }