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         if (NT_STATUS_IS_ERR(status)) {
  69                 return status;
  70         }
  71         if (!NT_STATUS_IS_OK(status)) {
  72                 /* w2k just ignores invalid packets, so we do */
  73                 DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n"));
  74                 TALLOC_FREE(call);
  75                 *_call = NULL;
  76                 return NT_STATUS_OK;
  77         }
  78
  79         /* and now encode the reply */
  80         packet_out_wrap.packet = call->rep_packet;
  81         ndr_err = ndr_push_struct_blob(&call->out, call,
  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;
 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         rc = tstream_bsd_existing_socket(wrepl_conn,
 128                                          socket_get_fd(conn->socket),
 129                                          &wrepl_conn->tstream);
 130         if (rc < 0) {
 131                 stream_terminate_connection(conn,
 132                                             "wrepl_accept: out of memory");
 133                 return;
 134         }
 135         socket_set_flags(conn->socket, SOCKET_FLAG_NOCLOSE);
 136
 137         wrepl_conn->conn = conn;
 138         wrepl_conn->service = service;
 139
 140         peer_addr = conn->remote_address;
 141
 142         if (!tsocket_address_is_inet(peer_addr, "ipv4")) {
 143                 DEBUG(0,("wreplsrv_accept: non ipv4 peer addr '%s'\n",
 144                         tsocket_address_string(peer_addr, wrepl_conn)));
 145                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: "
 146                                 "invalid peer IP");
 147                 return;
 148         }
 149
 150         peer_ip = tsocket_address_inet_addr_string(peer_addr, wrepl_conn);
 151         if (peer_ip == NULL) {
 152                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_accept: "
 153                                 "could not convert peer IP into a string");
 154                 return;
 155         }
 156
 157         wrepl_conn->partner = wreplsrv_find_partner(service, peer_ip);
 158         irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
 159
 160         /*
 161          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 162          * packet_full_request_u32 provides the pdu length then.
 163          */
 164         subreq = tstream_read_pdu_blob_send(wrepl_conn,
 165                                             wrepl_conn->conn->event.ctx,
 166                                             wrepl_conn->tstream,
 167                                             4, /* initial_read_size */
 168                                             packet_full_request_u32,
 169                                             wrepl_conn);
 170         if (subreq == NULL) {
 171                 wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_accept: "
 172                                 "no memory for tstream_read_pdu_blob_send");
 173                 return;
 174         }
 175         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn);
 176 }
 177
 178 static void wreplsrv_call_writev_done(struct tevent_req *subreq);
 179
 180 static void wreplsrv_call_loop(struct tevent_req *subreq)
 181 {
 182         struct wreplsrv_in_connection *wrepl_conn = tevent_req_callback_data(subreq,
 183                                       struct wreplsrv_in_connection);
 184         struct wreplsrv_in_call *call;
 185         NTSTATUS status;
 186
 187         call = talloc_zero(wrepl_conn, struct wreplsrv_in_call);
 188         if (call == NULL) {
 189                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 190                                 "no memory for wrepl_samba3_call");
 191                 return;
 192         }
 193         call->wreplconn = wrepl_conn;
 194
 195         status = tstream_read_pdu_blob_recv(subreq,
 196                                             call,
 197                                             &call->in);
 198         TALLOC_FREE(subreq);
 199         if (!NT_STATUS_IS_OK(status)) {
 200                 const char *reason;
 201
 202                 reason = talloc_asprintf(call, "wreplsrv_call_loop: "
 203                                          "tstream_read_pdu_blob_recv() - %s",
 204                                          nt_errstr(status));
 205                 if (!reason) {
 206                         reason = nt_errstr(status);
 207                 }
 208
 209                 wreplsrv_terminate_in_connection(wrepl_conn, reason);
 210                 return;
 211         }
 212
 213         DEBUG(10,("Received wrepl packet of length %lu from %s\n",
 214                  (long) call->in.length,
 215                  tsocket_address_string(wrepl_conn->conn->remote_address, call)));
 216
 217         /* skip length header */
 218         call->in.data += 4;
 219         call->in.length -= 4;
 220
 221         status = wreplsrv_process(wrepl_conn, &call);
 222         if (!NT_STATUS_IS_OK(status)) {
 223                 const char *reason;
 224
 225                 reason = talloc_asprintf(call, "wreplsrv_call_loop: "
 226                                          "tstream_read_pdu_blob_recv() - %s",
 227                                          nt_errstr(status));
 228                 if (reason == NULL) {
 229                         reason = nt_errstr(status);
 230                 }
 231
 232                 wreplsrv_terminate_in_connection(wrepl_conn, reason);
 233                 return;
 234         }
 235
 236         /* We handed over the connection so we're done here */
 237         if (wrepl_conn->tstream == NULL) {
 238             return;
 239         }
 240
 241         /* Invalid WINS-Replication packet, we just ignore it */
 242         if (call == NULL) {
 243                 goto noreply;
 244         }
 245
 246         call->out_iov[0].iov_base = (char *) call->out.data;
 247         call->out_iov[0].iov_len = call->out.length;
 248
 249         subreq = tstream_writev_queue_send(call,
 250                                            wrepl_conn->conn->event.ctx,
 251                                            wrepl_conn->tstream,
 252                                            wrepl_conn->send_queue,
 253                                            call->out_iov, 1);
 254         if (subreq == NULL) {
 255                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 256                                 "no memory for tstream_writev_queue_send");
 257                 return;
 258         }
 259         tevent_req_set_callback(subreq, wreplsrv_call_writev_done, call);
 260
 261 noreply:
 262         /*
 263          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 264          *  provides the pdu length then.
 265          */
 266         subreq = tstream_read_pdu_blob_send(wrepl_conn,
 267                                             wrepl_conn->conn->event.ctx,
 268                                             wrepl_conn->tstream,
 269                                             4, /* initial_read_size */
 270                                             packet_full_request_u32,
 271                                             wrepl_conn);
 272         if (subreq == NULL) {
 273                 wreplsrv_terminate_in_connection(wrepl_conn, "wreplsrv_call_loop: "
 274                                 "no memory for tstream_read_pdu_blob_send");
 275                 return;
 276         }
 277         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_conn);
 278 }
 279
 280 static void wreplsrv_call_writev_done(struct tevent_req *subreq)
 281 {
 282         struct wreplsrv_in_call *call = tevent_req_callback_data(subreq,
 283                         struct wreplsrv_in_call);
 284         int sys_errno;
 285         int rc;
 286
 287         rc = tstream_writev_queue_recv(subreq, &sys_errno);
 288         TALLOC_FREE(subreq);
 289         if (rc == -1) {
 290                 const char *reason;
 291
 292                 reason = talloc_asprintf(call, "wreplsrv_call_writev_done: "
 293                                          "tstream_writev_queue_recv() - %d:%s",
 294                                          sys_errno, strerror(sys_errno));
 295                 if (reason == NULL) {
 296                         reason = "wreplsrv_call_writev_done: "
 297                                  "tstream_writev_queue_recv() failed";
 298                 }
 299
 300                 wreplsrv_terminate_in_connection(call->wreplconn, reason);
 301                 return;
 302         }
 303
 304         if (call->terminate_after_send) {
 305                 wreplsrv_terminate_in_connection(call->wreplconn,
 306                                 "wreplsrv_in_connection: terminate_after_send");
 307                 return;
 308         }
 309
 310         talloc_free(call);
 311 }
 312
 313 /*
 314   called on a tcp recv
 315 */
 316 static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags)
 317 {
 318         struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data,
 319                                                         struct wreplsrv_in_connection);
 320         /* this should never be triggered! */
 321         DEBUG(0,("Terminating connection - '%s'\n", "wrepl_recv: called"));
 322         wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_recv: called");
 323 }
 324
 325 /*
 326   called when we can write to a connection
 327 */
 328 static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
 329 {
 330         struct wreplsrv_in_connection *wrepl_conn = talloc_get_type(conn->private_data,
 331                                                         struct wreplsrv_in_connection);
 332         /* this should never be triggered! */
 333         DEBUG(0,("Terminating connection - '%s'\n", "wrepl_send: called"));
 334         wreplsrv_terminate_in_connection(wrepl_conn, "wrepl_send: called");
 335 }
 336
 337 static const struct stream_server_ops wreplsrv_stream_ops = {
 338         .name                   = "wreplsrv",
 339         .accept_connection      = wreplsrv_accept,
 340         .recv_handler           = wreplsrv_recv,
 341         .send_handler           = wreplsrv_send,
 342 };
 343
 344 /*
 345   called when we get a new connection
 346 */
 347 NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
 348                                       uint32_t peer_assoc_ctx,
 349                                       struct tstream_context **stream,
 350                                       struct wreplsrv_in_connection **_wrepl_in)
 351 {
 352         struct wreplsrv_service *service = partner->service;
 353         struct wreplsrv_in_connection *wrepl_in;
 354         const struct model_ops *model_ops;
 355         struct stream_connection *conn;
 356         struct tevent_req *subreq;
 357         NTSTATUS status;
 358
 359         /* within the wrepl task we want to be a single process, so
 360            ask for the single process model ops and pass these to the
 361            stream_setup_socket() call. */
 362         model_ops = process_model_startup("single");
 363         if (!model_ops) {
 364                 DEBUG(0,("Can't find 'single' process model_ops"));
 365                 return NT_STATUS_INTERNAL_ERROR;
 366         }
 367
 368         wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
 369         NT_STATUS_HAVE_NO_MEMORY(wrepl_in);
 370
 371         wrepl_in->service       = service;
 372         wrepl_in->partner       = partner;
 373         wrepl_in->tstream       = talloc_move(wrepl_in, stream);
 374         wrepl_in->assoc_ctx.peer_ctx = peer_assoc_ctx;
 375
 376         status = stream_new_connection_merge(service->task->event_ctx,
 377                                              service->task->lp_ctx,
 378                                              model_ops,
 379                                              &wreplsrv_stream_ops,
 380                                              service->task->msg_ctx,
 381                                              wrepl_in,
 382                                              &conn);
 383         NT_STATUS_NOT_OK_RETURN(status);
 384
 385         /*
 386          * make the wreplsrv_in_connection structure a child of the
 387          * stream_connection, to match the hierarchy of wreplsrv_accept
 388          */
 389         wrepl_in->conn          = conn;
 390         talloc_steal(conn, wrepl_in);
 391
 392         wrepl_in->send_queue = tevent_queue_create(wrepl_in, "wreplsrv_in_connection_merge");
 393         if (wrepl_in->send_queue == NULL) {
 394                 stream_terminate_connection(conn,
 395                                             "wreplsrv_in_connection_merge: out of memory");
 396                 return NT_STATUS_NO_MEMORY;
 397         }
 398
 399         /*
 400          * The wrepl pdu's has the length as 4 byte (initial_read_size),
 401          * packet_full_request_u32 provides the pdu length then.
 402          */
 403         subreq = tstream_read_pdu_blob_send(wrepl_in,
 404                                             wrepl_in->conn->event.ctx,
 405                                             wrepl_in->tstream,
 406                                             4, /* initial_read_size */
 407                                             packet_full_request_u32,
 408                                             wrepl_in);
 409         if (subreq == NULL) {
 410                 wreplsrv_terminate_in_connection(wrepl_in, "wreplsrv_in_connection_merge: "
 411                                 "no memory for tstream_read_pdu_blob_send");
 412                 return NT_STATUS_NO_MEMORY;
 413         }
 414         tevent_req_set_callback(subreq, wreplsrv_call_loop, wrepl_in);
 415
 416         *_wrepl_in = wrepl_in;
 417
 418         return NT_STATUS_OK;
 419 }
 420
 421 /*
 422   startup the wrepl port 42 server sockets
 423 */
 424 NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service, struct loadparm_context *lp_ctx)
 425 {
 426         NTSTATUS status;
 427         struct task_server *task = service->task;
 428         const struct model_ops *model_ops;
 429         const char *address;
 430         uint16_t port = WINS_REPLICATION_PORT;
 431
 432         /* within the wrepl task we want to be a single process, so
 433            ask for the single process model ops and pass these to the
 434            stream_setup_socket() call. */
 435         model_ops = process_model_startup("single");
 436         if (!model_ops) {
 437                 DEBUG(0,("Can't find 'single' process model_ops"));
 438                 return NT_STATUS_INTERNAL_ERROR;
 439         }
 440
 441         if (lpcfg_interfaces(lp_ctx) && lpcfg_bind_interfaces_only(lp_ctx)) {
 442                 int num_interfaces;
 443                 int i;
 444                 struct interface *ifaces;
 445
 446                 load_interface_list(task, lp_ctx, &ifaces);
 447
 448                 num_interfaces = iface_list_count(ifaces);
 449
 450                 /* We have been given an interfaces line, and been
 451                    told to only bind to those interfaces. Create a
 452                    socket per interface and bind to only these.
 453                 */
 454                 for(i = 0; i < num_interfaces; i++) {
 455                         if (!iface_list_n_is_v4(ifaces, i)) {
 456                                 continue;
 457                         }
 458                         address = iface_list_n_ip(ifaces, i);
 459                         status = stream_setup_socket(task, task->event_ctx,
 460                                                      task->lp_ctx, model_ops,
 461                                                      &wreplsrv_stream_ops,
 462                                                      "ipv4", address, &port,
 463                                                       lpcfg_socket_options(task->lp_ctx),
 464                                                      service);
 465                         if (!NT_STATUS_IS_OK(status)) {
 466                                 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 467                                          address, port, nt_errstr(status)));
 468                                 return status;
 469                         }
 470                 }
 471         } else {
 472                 address = "0.0.0.0";
 473                 status = stream_setup_socket(task, task->event_ctx, task->lp_ctx,
 474                                              model_ops, &wreplsrv_stream_ops,
 475                                              "ipv4", address, &port, lpcfg_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
 484         return NT_STATUS_OK;
 485 }