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                                        lp_iconv_convenience(wrepl_conn->service->task->lp_ctx),
  56                                        &call->req_packet,
  57                                        (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
  58         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  59                 return ndr_map_error2ntstatus(ndr_err);
  60         }
  61
  62         if (DEBUGLVL(10)) {
  63                 DEBUG(10,("Received WINS-Replication packet of length %u\n",
  64                           (unsigned int) call->in.length + 4));
  65                 NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet);
  66         }
  67
  68         status = wreplsrv_in_call(call);
  69         NT_STATUS_IS_ERR_RETURN(status);
  70         if (!NT_STATUS_IS_OK(status)) {
  71                 /* w2k just ignores invalid packets, so we do */
  72                 DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n"));
  73                 TALLOC_FREE(call);
  74                 *_call = NULL;
  75                 return NT_STATUS_OK;
  76         }
  77
  78         /* and now encode the reply */
  79         packet_out_wrap.packet = call->rep_packet;
  80         ndr_err = ndr_push_struct_blob(&call->out, call,
  81                                        lp_iconv_convenience(wrepl_conn->service->task->lp_ctx),
  82                                        &packet_out_wrap,
  83                                        (ndr_push_flags_fn_t) ndr_push_wrepl_wrap);
  84         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  85                 return ndr_map_error2ntstatus(ndr_err);
  86         }
  87
  88         if (DEBUGLVL(10)) {
  89                 DEBUG(10,("Sending WINS-Replication packet of length %u\n",
  90                          (unsigned int) call->out.length));
  91                 NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet);
  92         }
  93
  94         return NT_STATUS_OK;
  95 }
  96
  97 static void wreplsrv_call_loop(struct tevent_req *subreq);
  98
  99 /*
 100   called when we get a new connection
 101 */
 102 static void wreplsrv_accept(struct stream_connection *conn)
 103 {
 104         struct wreplsrv_service *service = talloc_get_type(conn->private_data, struct wreplsrv_service);
 105         struct wreplsrv_in_connection *wrepl_conn;
 106         struct tsocket_address *peer_addr;
 107         char *peer_ip;
 108         struct tevent_req *subreq;
 109         int rc, fd;
 110
 111         wrepl_conn = talloc_zero(conn, struct wreplsrv_in_connection);
 112         if (wrepl_conn == NULL) {
 113                 stream_terminate_connection(conn,
 114                                             "wreplsrv_accept: out of memory");
 115                 return;
 116         }
 117
 118         wrepl_conn->send_queue = tevent_queue_create(conn, "wrepl_accept");
 119         if (wrepl_conn->send_queue == NULL) {
 120                 stream_terminate_connection(conn,
 121                                             "wrepl_accept: out of memory");
 122                 return;
 123         }
 124
 125         TALLOC_FREE(conn->event.fde);
 126
 127         /*
 128          * Clone the fd that the connection isn't closed if we create a client
 129          * connection.
 130          */
 131         fd = dup(socket_get_fd(conn->socket));
 132         if (fd == -1) {
 133                 char *reason;
 134
 135                 reason = talloc_asprintf(conn,
 136                                          "wrepl_accept: failed to duplicate the file descriptor - %s",
 137                                          strerror(errno));
 138                 if (reason == NULL) {
 139                         reason = strerror(errno);
 140                 }
 141                 stream_terminate_connection(conn, reason);
 142         }
 143         rc = tstream_bsd_existing_socket(wrepl_conn,
 144                                          fd,
 145                                          &wrepl_conn->tstream);
 146         if (rc < 0) {
 147                 stream_terminate_connection(conn,
 148                                             "wrepl_accept: out of memory");
 149                 return;
 150         }
 151
 152         wrepl_conn->conn = conn;
 153         wrepl_conn->service = service;
 154
 155         peer_addr = conn->remote_address;
 156
 157         if (!tsocket_address_is_inet(peer_addr, "ipv4")) {
 158                 DEBUG(0,("wreplsrv_accept: non ipv4 peer addr '%s'\n",
 159                         tsocket_address_string(peer_addr, wrepl_conn)));
 160                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: "
 161                                 "invalid peer IP");
 162                 return;
 163         }
 164
 165         peer_ip = tsocket_address_inet_addr_string(peer_addr, wrepl_conn);
 166         if (peer_ip == NULL) {
 167                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: "
 168                                 "could not convert peer IP into a string");
 169                 return;
 170         }
 171
 172         wrepl_conn->partner = wreplsrv_find_partner(service, peer_ip);
 173         irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
 174
 175         /*
 176          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 177          * packet_full_request_u32 provides the pdu length then.
 178          */
 179         subreq = tstream_read_pdu_blob_send(wrepl_conn,
 180                                             wrepl_conn->conn->event.ctx,
 181                                             wrepl_conn->tstream,
 182                                             4, /* initial_read_size */
 183                                             packet_full_request_u32,
 184                                             wrepl_conn);
 185         if (subreq == NULL) {
 186                 wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_accept: "
 187                                 "no memory for tstream_read_pdu_blob_send");
 188                 return;
 189         }
 190         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn);
 191 }
 192
 193 static void wreplsrv_call_writev_done(struct tevent_req *subreq);
 194
 195 static void wreplsrv_call_loop(struct tevent_req *subreq)
 196 {
 197         struct wreplsrv_in_connection *wrepl_conn = tevent_req_callback_data(subreq,
 198                                       struct wreplsrv_in_connection);
 199         struct wreplsrv_in_call *call;
 200         NTSTATUS status;
 201
 202         call = talloc_zero(wrepl_conn, struct wreplsrv_in_call);
 203         if (call == NULL) {
 204                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 205                                 "no memory for wrepl_samba3_call");
 206                 return;
 207         }
 208         call->wreplconn = wrepl_conn;
 209
 210         status = tstream_read_pdu_blob_recv(subreq,
 211                                             call,
 212                                             &call->in);
 213         TALLOC_FREE(subreq);
 214         if (!NT_STATUS_IS_OK(status)) {
 215                 const char *reason;
 216
 217                 reason = talloc_asprintf(call, "wreplsrv_call_loop: "
 218                                          "tstream_read_pdu_blob_recv() - %s",
 219                                          nt_errstr(status));
 220                 if (!reason) {
 221                         reason = nt_errstr(status);
 222                 }
 223
 224                 wreplsrv_terminate_in_connection(wrepl_conn, reason);
 225                 return;
 226         }
 227
 228         DEBUG(10,("Received wrepl packet of length %lu from %s\n",
 229                  (long) call->in.length,
 230                  tsocket_address_string(wrepl_conn->conn->remote_address, call)));
 231
 232         /* skip length header */
 233         call->in.data += 4;
 234         call->in.length -= 4;
 235
 236         status = wreplsrv_process(wrepl_conn, &call);
 237         if (!NT_STATUS_IS_OK(status)) {
 238                 const char *reason;
 239
 240                 reason = talloc_asprintf(call, "wreplsrv_call_loop: "
 241                                          "tstream_read_pdu_blob_recv() - %s",
 242                                          nt_errstr(status));
 243                 if (reason == NULL) {
 244                         reason = nt_errstr(status);
 245                 }
 246
 247                 wreplsrv_terminate_in_connection(wrepl_conn, reason);
 248                 return;
 249         }
 250
 251         /* We handed over the connection so we're done here */
 252         if (wrepl_conn->tstream == NULL) {
 253             return;
 254         }
 255
 256         /* Invalid WINS-Replication packet, we just ignore it */
 257         if (call == NULL) {
 258                 goto noreply;
 259         }
 260
 261         call->out_iov[0].iov_base = call->out.data;
 262         call->out_iov[0].iov_len = call->out.length;
 263
 264         subreq = tstream_writev_queue_send(call,
 265                                            wrepl_conn->conn->event.ctx,
 266                                            wrepl_conn->tstream,
 267                                            wrepl_conn->send_queue,
 268                                            call->out_iov, 1);
 269         if (subreq == NULL) {
 270                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 271                                 "no memory for tstream_writev_queue_send");
 272                 return;
 273         }
 274         tevent_req_set_callback(subreq, wreplsrv_call_writev_done, call);
 275
 276 noreply:
 277         /*
 278          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 279          *  provides the pdu length then.
 280          */
 281         subreq = tstream_read_pdu_blob_send(wrepl_conn,
 282                                             wrepl_conn->conn->event.ctx,
 283                                             wrepl_conn->tstream,
 284                                             4, /* initial_read_size */
 285                                             packet_full_request_u32,
 286                                             wrepl_conn);
 287         if (subreq == NULL) {
 288                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 289                                 "no memory for tstream_read_pdu_blob_send");
 290                 return;
 291         }
 292         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn);
 293 }
 294
 295 static void wreplsrv_call_writev_done(struct tevent_req *subreq)
 296 {
 297         struct wreplsrv_in_call *call = tevent_req_callback_data(subreq,
 298                         struct wreplsrv_in_call);
 299         int sys_errno;
 300         int rc;
 301
 302         rc = tstream_writev_queue_recv(subreq, &sys_errno);
 303         TALLOC_FREE(subreq);
 304         if (rc == -1) {
 305                 const char *reason;
 306
 307                 reason = talloc_asprintf(call, "wreplsrv_call_writev_done: "
 308                                          "tstream_writev_queue_recv() - %d:%s",
 309                                          sys_errno, strerror(sys_errno));
 310                 if (reason == NULL) {
 311                         reason = "wreplsrv_call_writev_done: "
 312                                  "tstream_writev_queue_recv() failed";
 313                 }
 314
 315                 wreplsrv_terminate_in_connection(call->wreplconn, reason);
 316                 return;
 317         }
 318
 319         if (call->terminate_after_send) {
 320                 wreplsrv_terminate_in_connection(call->wreplconn,
 321                                 "wreplsrv_in_connection: terminate_after_send");
 322                 return;
 323         }
 324
 325         talloc_free(call);
 326 }
 327
 328 /*
 329   called on a tcp recv
 330 */
 331 static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags)
 332 {
 333         struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data,
 334                                                         struct wreplsrv_in_connection);
 335         /* this should never be triggered! */
 336         DEBUG(0,("Terminating connection - '%s'\n", "wrepl_recv: called"));
 337         wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_recv: called");
 338 }
 339
 340 /*
 341   called when we can write to a connection
 342 */
 343 static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
 344 {
 345         struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data,
 346                                                         struct wreplsrv_in_connection);
 347         /* this should never be triggered! */
 348         DEBUG(0,("Terminating connection - '%s'\n", "wrepl_send: called"));
 349         wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_send: called");
 350 }
 351
 352 static const struct stream_server_ops wreplsrv_stream_ops = {
 353         .name                   = "wreplsrv",
 354         .accept_connection      = wreplsrv_accept,
 355         .recv_handler           = wreplsrv_recv,
 356         .send_handler           = wreplsrv_send,
 357 };
 358
 359 /*
 360   called when we get a new connection
 361 */
 362 NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
 363                                       uint32_t peer_assoc_ctx,
 364                                       struct tstream_context **stream,
 365                                       struct wreplsrv_in_connection **_wrepl_in)
 366 {
 367         struct wreplsrv_service *service = partner->service;
 368         struct wreplsrv_in_connection *wrepl_in;
 369         const struct model_ops *model_ops;
 370         struct stream_connection *conn;
 371         struct tevent_req *subreq;
 372         NTSTATUS status;
 373
 374         /* within the wrepl task we want to be a single process, so
 375            ask for the single process model ops and pass these to the
 376            stream_setup_socket() call. */
 377         model_ops = process_model_startup(service->task->event_ctx, "single");
 378         if (!model_ops) {
 379                 DEBUG(0,("Can't find 'single' process model_ops"));
 380                 return NT_STATUS_INTERNAL_ERROR;
 381         }
 382
 383         wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
 384         NT_STATUS_HAVE_NO_MEMORY(wrepl_in);
 385
 386         wrepl_in->service       = service;
 387         wrepl_in->partner       = partner;
 388         wrepl_in->tstream       = talloc_move(wrepl_in, stream);
 389         wrepl_in->assoc_ctx.peer_ctx = peer_assoc_ctx;
 390
 391         status = stream_new_connection_merge(service->task->event_ctx,
 392                                              service->task->lp_ctx,
 393                                              model_ops,
 394                                              &wreplsrv_stream_ops,
 395                                              service->task->msg_ctx,
 396                                              wrepl_in,
 397                                              &conn);
 398         NT_STATUS_NOT_OK_RETURN(status);
 399
 400         /*
 401          * make the wreplsrv_in_connection structure a child of the
 402          * stream_connection, to match the hierarchy of wreplsrv_accept
 403          */
 404         wrepl_in->conn          = conn;
 405         talloc_steal(conn, wrepl_in);
 406
 407         wrepl_in->send_queue = tevent_queue_create(wrepl_in, "wreplsrv_in_connection_merge");
 408         if (wrepl_in->send_queue == NULL) {
 409                 stream_terminate_connection(conn,
 410                                             "wreplsrv_in_connection_merge: out of memory");
 411                 return NT_STATUS_NO_MEMORY;
 412         }
 413
 414         /*
 415          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 416          * packet_full_request_u32 provides the pdu length then.
 417          */
 418         subreq = tstream_read_pdu_blob_send(wrepl_in,
 419                                             wrepl_in->conn->event.ctx,
 420                                             wrepl_in->tstream,
 421                                             4, /* initial_read_size */
 422                                             packet_full_request_u32,
 423                                             wrepl_in);
 424         if (subreq == NULL) {
 425                 wreplsrv_terminate_in_connection(wrepl_in, "wreplsrv_in_connection_merge: "
 426                                 "no memory for tstream_read_pdu_blob_send");
 427                 return NT_STATUS_NO_MEMORY;
 428         }
 429         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_in);
 430
 431         *_wrepl_in = wrepl_in;
 432
 433         return NT_STATUS_OK;
 434 }
 435
 436 /*
 437   startup the wrepl port 42 server sockets
 438 */
 439 NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service, struct loadparm_context *lp_ctx)
 440 {
 441         NTSTATUS status;
 442         struct task_server *task = service->task;
 443         const struct model_ops *model_ops;
 444         const char *address;
 445         uint16_t port = WINS_REPLICATION_PORT;
 446
 447         /* within the wrepl task we want to be a single process, so
 448            ask for the single process model ops and pass these to the
 449            stream_setup_socket() call. */
 450         model_ops = process_model_startup(task->event_ctx, "single");
 451         if (!model_ops) {
 452                 DEBUG(0,("Can't find 'single' process model_ops"));
 453                 return NT_STATUS_INTERNAL_ERROR;
 454         }
 455
 456         if (lp_interfaces(lp_ctx) && lp_bind_interfaces_only(lp_ctx)) {
 457                 int num_interfaces;
 458                 int i;
 459                 struct interface *ifaces;
 460
 461                 load_interfaces(task, lp_interfaces(lp_ctx), &ifaces);
 462
 463                 num_interfaces = iface_count(ifaces);
 464
 465                 /* We have been given an interfaces line, and been
 466                    told to only bind to those interfaces. Create a
 467                    socket per interface and bind to only these.
 468                 */
 469                 for(i = 0; i < num_interfaces; i++) {
 470                         address = iface_n_ip(ifaces, i);
 471                         status = stream_setup_socket(task->event_ctx,
 472                                                      task->lp_ctx, model_ops,
 473                                                      &wreplsrv_stream_ops,
 474                                                      "ipv4", address, &port,
 475                                                       lp_socket_options(task->lp_ctx),
 476                                                      service);
 477                         if (!NT_STATUS_IS_OK(status)) {
 478                                 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 479                                          address, port, nt_errstr(status)));
 480                                 return status;
 481                         }
 482                 }
 483         } else {
 484                 address = lp_socket_address(lp_ctx);
 485                 status = stream_setup_socket(task->event_ctx, task->lp_ctx,
 486                                              model_ops, &wreplsrv_stream_ops,
 487                                              "ipv4", address, &port, lp_socket_options(task->lp_ctx),
 488                                              service);
 489                 if (!NT_STATUS_IS_OK(status)) {
 490                         DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 491                                  address, port, nt_errstr(status)));
 492                         return status;
 493                 }
 494         }
 495
 496         return NT_STATUS_OK;
 497 }