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;
 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         rc = tstream_bsd_existing_socket(wrepl_conn,
 126                                          socket_get_fd(conn->socket),
 127                                          &wrepl_conn->tstream);
 128         if (rc < 0) {
 129                 stream_terminate_connection(conn,
 130                                             "wrepl_accept: out of memory");
 131                 return;
 132         }
 133         socket_set_flags(conn->socket, SOCKET_FLAG_NOCLOSE);
 134
 135         wrepl_conn->conn = conn;
 136         wrepl_conn->service = service;
 137
 138         peer_addr = conn->remote_address;
 139
 140         if (!tsocket_address_is_inet(peer_addr, "ipv4")) {
 141                 DEBUG(0,("wreplsrv_accept: non ipv4 peer addr '%s'\n",
 142                         tsocket_address_string(peer_addr, wrepl_conn)));
 143                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: "
 144                                 "invalid peer IP");
 145                 return;
 146         }
 147
 148         peer_ip = tsocket_address_inet_addr_string(peer_addr, wrepl_conn);
 149         if (peer_ip == NULL) {
 150                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: "
 151                                 "could not convert peer IP into a string");
 152                 return;
 153         }
 154
 155         wrepl_conn->partner = wreplsrv_find_partner(service, peer_ip);
 156         irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
 157
 158         /*
 159          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 160          * packet_full_request_u32 provides the pdu length then.
 161          */
 162         subreq = tstream_read_pdu_blob_send(wrepl_conn,
 163                                             wrepl_conn->conn->event.ctx,
 164                                             wrepl_conn->tstream,
 165                                             4, /* initial_read_size */
 166                                             packet_full_request_u32,
 167                                             wrepl_conn);
 168         if (subreq == NULL) {
 169                 wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_accept: "
 170                                 "no memory for tstream_read_pdu_blob_send");
 171                 return;
 172         }
 173         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn);
 174 }
 175
 176 static void wreplsrv_call_writev_done(struct tevent_req *subreq);
 177
 178 static void wreplsrv_call_loop(struct tevent_req *subreq)
 179 {
 180         struct wreplsrv_in_connection *wrepl_conn = tevent_req_callback_data(subreq,
 181                                       struct wreplsrv_in_connection);
 182         struct wreplsrv_in_call *call;
 183         NTSTATUS status;
 184
 185         call = talloc_zero(wrepl_conn, struct wreplsrv_in_call);
 186         if (call == NULL) {
 187                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 188                                 "no memory for wrepl_samba3_call");
 189                 return;
 190         }
 191         call->wreplconn = wrepl_conn;
 192
 193         status = tstream_read_pdu_blob_recv(subreq,
 194                                             call,
 195                                             &call->in);
 196         TALLOC_FREE(subreq);
 197         if (!NT_STATUS_IS_OK(status)) {
 198                 const char *reason;
 199
 200                 reason = talloc_asprintf(call, "wreplsrv_call_loop: "
 201                                          "tstream_read_pdu_blob_recv() - %s",
 202                                          nt_errstr(status));
 203                 if (!reason) {
 204                         reason = nt_errstr(status);
 205                 }
 206
 207                 wreplsrv_terminate_in_connection(wrepl_conn, reason);
 208                 return;
 209         }
 210
 211         DEBUG(10,("Received wrepl packet of length %lu from %s\n",
 212                  (long) call->in.length,
 213                  tsocket_address_string(wrepl_conn->conn->remote_address, call)));
 214
 215         /* skip length header */
 216         call->in.data += 4;
 217         call->in.length -= 4;
 218
 219         status = wreplsrv_process(wrepl_conn, &call);
 220         if (!NT_STATUS_IS_OK(status)) {
 221                 const char *reason;
 222
 223                 reason = talloc_asprintf(call, "wreplsrv_call_loop: "
 224                                          "tstream_read_pdu_blob_recv() - %s",
 225                                          nt_errstr(status));
 226                 if (reason == NULL) {
 227                         reason = nt_errstr(status);
 228                 }
 229
 230                 wreplsrv_terminate_in_connection(wrepl_conn, reason);
 231                 return;
 232         }
 233
 234         /* We handed over the connection so we're done here */
 235         if (wrepl_conn->tstream == NULL) {
 236             return;
 237         }
 238
 239         /* Invalid WINS-Replication packet, we just ignore it */
 240         if (call == NULL) {
 241                 goto noreply;
 242         }
 243
 244         call->out_iov[0].iov_base = (char *) call->out.data;
 245         call->out_iov[0].iov_len = call->out.length;
 246
 247         subreq = tstream_writev_queue_send(call,
 248                                            wrepl_conn->conn->event.ctx,
 249                                            wrepl_conn->tstream,
 250                                            wrepl_conn->send_queue,
 251                                            call->out_iov, 1);
 252         if (subreq == NULL) {
 253                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 254                                 "no memory for tstream_writev_queue_send");
 255                 return;
 256         }
 257         tevent_req_set_callback(subreq, wreplsrv_call_writev_done, call);
 258
 259 noreply:
 260         /*
 261          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 262          *  provides the pdu length then.
 263          */
 264         subreq = tstream_read_pdu_blob_send(wrepl_conn,
 265                                             wrepl_conn->conn->event.ctx,
 266                                             wrepl_conn->tstream,
 267                                             4, /* initial_read_size */
 268                                             packet_full_request_u32,
 269                                             wrepl_conn);
 270         if (subreq == NULL) {
 271                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 272                                 "no memory for tstream_read_pdu_blob_send");
 273                 return;
 274         }
 275         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn);
 276 }
 277
 278 static void wreplsrv_call_writev_done(struct tevent_req *subreq)
 279 {
 280         struct wreplsrv_in_call *call = tevent_req_callback_data(subreq,
 281                         struct wreplsrv_in_call);
 282         int sys_errno;
 283         int rc;
 284
 285         rc = tstream_writev_queue_recv(subreq, &sys_errno);
 286         TALLOC_FREE(subreq);
 287         if (rc == -1) {
 288                 const char *reason;
 289
 290                 reason = talloc_asprintf(call, "wreplsrv_call_writev_done: "
 291                                          "tstream_writev_queue_recv() - %d:%s",
 292                                          sys_errno, strerror(sys_errno));
 293                 if (reason == NULL) {
 294                         reason = "wreplsrv_call_writev_done: "
 295                                  "tstream_writev_queue_recv() failed";
 296                 }
 297
 298                 wreplsrv_terminate_in_connection(call->wreplconn, reason);
 299                 return;
 300         }
 301
 302         if (call->terminate_after_send) {
 303                 wreplsrv_terminate_in_connection(call->wreplconn,
 304                                 "wreplsrv_in_connection: terminate_after_send");
 305                 return;
 306         }
 307
 308         talloc_free(call);
 309 }
 310
 311 /*
 312   called on a tcp recv
 313 */
 314 static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags)
 315 {
 316         struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data,
 317                                                         struct wreplsrv_in_connection);
 318         /* this should never be triggered! */
 319         DEBUG(0,("Terminating connection - '%s'\n", "wrepl_recv: called"));
 320         wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_recv: called");
 321 }
 322
 323 /*
 324   called when we can write to a connection
 325 */
 326 static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
 327 {
 328         struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data,
 329                                                         struct wreplsrv_in_connection);
 330         /* this should never be triggered! */
 331         DEBUG(0,("Terminating connection - '%s'\n", "wrepl_send: called"));
 332         wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_send: called");
 333 }
 334
 335 static const struct stream_server_ops wreplsrv_stream_ops = {
 336         .name                   = "wreplsrv",
 337         .accept_connection      = wreplsrv_accept,
 338         .recv_handler           = wreplsrv_recv,
 339         .send_handler           = wreplsrv_send,
 340 };
 341
 342 /*
 343   called when we get a new connection
 344 */
 345 NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
 346                                       uint32_t peer_assoc_ctx,
 347                                       struct tstream_context **stream,
 348                                       struct wreplsrv_in_connection **_wrepl_in)
 349 {
 350         struct wreplsrv_service *service = partner->service;
 351         struct wreplsrv_in_connection *wrepl_in;
 352         const struct model_ops *model_ops;
 353         struct stream_connection *conn;
 354         struct tevent_req *subreq;
 355         NTSTATUS status;
 356
 357         /* within the wrepl task we want to be a single process, so
 358            ask for the single process model ops and pass these to the
 359            stream_setup_socket() call. */
 360         model_ops = process_model_startup("single");
 361         if (!model_ops) {
 362                 DEBUG(0,("Can't find 'single' process model_ops"));
 363                 return NT_STATUS_INTERNAL_ERROR;
 364         }
 365
 366         wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
 367         NT_STATUS_HAVE_NO_MEMORY(wrepl_in);
 368
 369         wrepl_in->service       = service;
 370         wrepl_in->partner       = partner;
 371         wrepl_in->tstream       = talloc_move(wrepl_in, stream);
 372         wrepl_in->assoc_ctx.peer_ctx = peer_assoc_ctx;
 373
 374         status = stream_new_connection_merge(service->task->event_ctx,
 375                                              service->task->lp_ctx,
 376                                              model_ops,
 377                                              &wreplsrv_stream_ops,
 378                                              service->task->msg_ctx,
 379                                              wrepl_in,
 380                                              &conn);
 381         NT_STATUS_NOT_OK_RETURN(status);
 382
 383         /*
 384          * make the wreplsrv_in_connection structure a child of the
 385          * stream_connection, to match the hierarchy of wreplsrv_accept
 386          */
 387         wrepl_in->conn          = conn;
 388         talloc_steal(conn, wrepl_in);
 389
 390         wrepl_in->send_queue = tevent_queue_create(wrepl_in, "wreplsrv_in_connection_merge");
 391         if (wrepl_in->send_queue == NULL) {
 392                 stream_terminate_connection(conn,
 393                                             "wreplsrv_in_connection_merge: out of memory");
 394                 return NT_STATUS_NO_MEMORY;
 395         }
 396
 397         /*
 398          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 399          * packet_full_request_u32 provides the pdu length then.
 400          */
 401         subreq = tstream_read_pdu_blob_send(wrepl_in,
 402                                             wrepl_in->conn->event.ctx,
 403                                             wrepl_in->tstream,
 404                                             4, /* initial_read_size */
 405                                             packet_full_request_u32,
 406                                             wrepl_in);
 407         if (subreq == NULL) {
 408                 wreplsrv_terminate_in_connection(wrepl_in, "wreplsrv_in_connection_merge: "
 409                                 "no memory for tstream_read_pdu_blob_send");
 410                 return NT_STATUS_NO_MEMORY;
 411         }
 412         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_in);
 413
 414         *_wrepl_in = wrepl_in;
 415
 416         return NT_STATUS_OK;
 417 }
 418
 419 /*
 420   startup the wrepl port 42 server sockets
 421 */
 422 NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service, struct loadparm_context *lp_ctx)
 423 {
 424         NTSTATUS status;
 425         struct task_server *task = service->task;
 426         const struct model_ops *model_ops;
 427         const char *address;
 428         uint16_t port = WINS_REPLICATION_PORT;
 429
 430         /* within the wrepl task we want to be a single process, so
 431            ask for the single process model ops and pass these to the
 432            stream_setup_socket() call. */
 433         model_ops = process_model_startup("single");
 434         if (!model_ops) {
 435                 DEBUG(0,("Can't find 'single' process model_ops"));
 436                 return NT_STATUS_INTERNAL_ERROR;
 437         }
 438
 439         if (lpcfg_interfaces(lp_ctx) && lpcfg_bind_interfaces_only(lp_ctx)) {
 440                 int num_interfaces;
 441                 int i;
 442                 struct interface *ifaces;
 443
 444                 load_interface_list(task, lp_ctx, &ifaces);
 445
 446                 num_interfaces = iface_list_count(ifaces);
 447
 448                 /* We have been given an interfaces line, and been
 449                    told to only bind to those interfaces. Create a
 450                    socket per interface and bind to only these.
 451                 */
 452                 for(i = 0; i < num_interfaces; i++) {
 453                         if (!iface_list_n_is_v4(ifaces, i)) {
 454                                 continue;
 455                         }
 456                         address = iface_list_n_ip(ifaces, i);
 457                         status = stream_setup_socket(task, task->event_ctx,
 458                                                      task->lp_ctx, model_ops,
 459                                                      &wreplsrv_stream_ops,
 460                                                      "ipv4", address, &port,
 461                                                       lpcfg_socket_options(task->lp_ctx),
 462                                                      service);
 463                         if (!NT_STATUS_IS_OK(status)) {
 464                                 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 465                                          address, port, nt_errstr(status)));
 466                                 return status;
 467                         }
 468                 }
 469         } else {
 470                 address = "0.0.0.0";
 471                 status = stream_setup_socket(task, task->event_ctx, task->lp_ctx,
 472                                              model_ops, &wreplsrv_stream_ops,
 473                                              "ipv4", address, &port, lpcfg_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
 482         return NT_STATUS_OK;
 483 }