source/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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "lib/socket/socket.h"
  25 #include "lib/stream/packet.h"
  26 #include "smbd/service_task.h"
  27 #include "smbd/service_stream.h"
  28 #include "lib/messaging/irpc.h"
  29 #include "librpc/gen_ndr/ndr_winsrepl.h"
  30 #include "wrepl_server/wrepl_server.h"
  31
  32 void wreplsrv_terminate_in_connection(struct wreplsrv_in_connection *wreplconn, const char *reason)
  33 {
  34         stream_terminate_connection(wreplconn->conn, reason);
  35 }
  36
  37 static int terminate_after_send_destructor(void *ptr)
  38 {
  39         struct wreplsrv_in_connection **tas = talloc_get_type(ptr, struct wreplsrv_in_connection *);
  40         wreplsrv_terminate_in_connection(*tas, "wreplsrv_in_connection: terminate_after_send");
  41         return 0;
  42 }
  43
  44 /*
  45   receive some data on a WREPL connection
  46 */
  47 static NTSTATUS wreplsrv_recv_request(void *private, DATA_BLOB blob)
  48 {
  49         struct wreplsrv_in_connection *wreplconn = talloc_get_type(private, struct wreplsrv_in_connection);
  50         struct wreplsrv_in_call *call;
  51         DATA_BLOB packet_in_blob;
  52         DATA_BLOB packet_out_blob;
  53         struct wrepl_wrap packet_out_wrap;
  54         NTSTATUS status;
  55
  56         call = talloc_zero(wreplconn, struct wreplsrv_in_call);
  57         NT_STATUS_HAVE_NO_MEMORY(call);
  58         call->wreplconn = wreplconn;
  59         talloc_steal(call, blob.data);
  60
  61         packet_in_blob.data = blob.data + 4;
  62         packet_in_blob.length = blob.length - 4;
  63
  64         status = ndr_pull_struct_blob(&packet_in_blob, call, &call->req_packet,
  65                                       (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
  66         NT_STATUS_NOT_OK_RETURN(status);
  67
  68         if (DEBUGLVL(10)) {
  69                 DEBUG(10,("Received WINS-Replication packet of length %u\n", packet_in_blob.length + 4));
  70                 NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet);
  71         }
  72
  73         status = wreplsrv_in_call(call);
  74         NT_STATUS_IS_ERR_RETURN(status);
  75         if (!NT_STATUS_IS_OK(status)) {
  76                 /* w2k just ignores invalid packets, so we do */
  77                 DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n"));
  78                 talloc_free(call);
  79                 return NT_STATUS_OK;
  80         }
  81
  82         /* and now encode the reply */
  83         packet_out_wrap.packet = call->rep_packet;
  84         status = ndr_push_struct_blob(&packet_out_blob, call, &packet_out_wrap,
  85                                       (ndr_push_flags_fn_t)ndr_push_wrepl_wrap);
  86         NT_STATUS_NOT_OK_RETURN(status);
  87
  88         if (DEBUGLVL(10)) {
  89                 DEBUG(10,("Sending WINS-Replication packet of length %d\n", (int)packet_out_blob.length));
  90                 NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet);
  91         }
  92
  93         if (call->terminate_after_send) {
  94                 struct wreplsrv_in_connection **tas;
  95                 tas = talloc(packet_out_blob.data, struct wreplsrv_in_connection *);
  96                 NT_STATUS_HAVE_NO_MEMORY(tas);
  97                 *tas = wreplconn;
  98                 talloc_set_destructor(tas, terminate_after_send_destructor);
  99         }
 100
 101         status = packet_send(wreplconn->packet, packet_out_blob);
 102         NT_STATUS_NOT_OK_RETURN(status);
 103
 104         talloc_free(call);
 105         return NT_STATUS_OK;
 106 }
 107
 108 /*
 109   called when the socket becomes readable
 110 */
 111 static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags)
 112 {
 113         struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private,
 114                                                                    struct wreplsrv_in_connection);
 115
 116         packet_recv(wreplconn->packet);
 117 }
 118
 119 /*
 120   called when the socket becomes writable
 121 */
 122 static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
 123 {
 124         struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private,
 125                                                                    struct wreplsrv_in_connection);
 126         packet_queue_run(wreplconn->packet);
 127 }
 128
 129 /*
 130   handle socket recv errors
 131 */
 132 static void wreplsrv_recv_error(void *private, NTSTATUS status)
 133 {
 134         struct wreplsrv_in_connection *wreplconn = talloc_get_type(private,
 135                                                                    struct wreplsrv_in_connection);
 136         wreplsrv_terminate_in_connection(wreplconn, nt_errstr(status));
 137 }
 138
 139 /*
 140   called when we get a new connection
 141 */
 142 static void wreplsrv_accept(struct stream_connection *conn)
 143 {
 144         struct wreplsrv_service *service = talloc_get_type(conn->private, struct wreplsrv_service);
 145         struct wreplsrv_in_connection *wreplconn;
 146         struct socket_address *peer_ip;
 147
 148         wreplconn = talloc_zero(conn, struct wreplsrv_in_connection);
 149         if (!wreplconn) {
 150                 stream_terminate_connection(conn, "wreplsrv_accept: out of memory");
 151                 return;
 152         }
 153
 154         wreplconn->packet = packet_init(wreplconn);
 155         if (!wreplconn->packet) {
 156                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: out of memory");
 157                 return;
 158         }
 159         packet_set_private(wreplconn->packet, wreplconn);
 160         packet_set_socket(wreplconn->packet, conn->socket);
 161         packet_set_callback(wreplconn->packet, wreplsrv_recv_request);
 162         packet_set_full_request(wreplconn->packet, packet_full_request_u32);
 163         packet_set_error_handler(wreplconn->packet, wreplsrv_recv_error);
 164         packet_set_event_context(wreplconn->packet, conn->event.ctx);
 165         packet_set_fde(wreplconn->packet, conn->event.fde);
 166         packet_set_serialise(wreplconn->packet);
 167
 168         wreplconn->conn         = conn;
 169         wreplconn->service      = service;
 170
 171         peer_ip = socket_get_peer_addr(conn->socket, wreplconn);
 172         if (!peer_ip) {
 173                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: could not obtain peer IP from kernel");
 174                 return;
 175         }
 176
 177         wreplconn->partner      = wreplsrv_find_partner(service, peer_ip->addr);
 178
 179         conn->private = wreplconn;
 180
 181         irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
 182 }
 183
 184 static const struct stream_server_ops wreplsrv_stream_ops = {
 185         .name                   = "wreplsrv",
 186         .accept_connection      = wreplsrv_accept,
 187         .recv_handler           = wreplsrv_recv,
 188         .send_handler           = wreplsrv_send,
 189 };
 190
 191 /*
 192   called when we get a new connection
 193 */
 194 NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
 195                                       struct socket_context *sock,
 196                                       struct packet_context *packet,
 197                                       struct wreplsrv_in_connection **_wrepl_in)
 198 {
 199         struct wreplsrv_service *service = partner->service;
 200         struct wreplsrv_in_connection *wrepl_in;
 201         const struct model_ops *model_ops;
 202         struct stream_connection *conn;
 203         NTSTATUS status;
 204
 205         /* within the wrepl task we want to be a single process, so
 206            ask for the single process model ops and pass these to the
 207            stream_setup_socket() call. */
 208         model_ops = process_model_byname("single");
 209         if (!model_ops) {
 210                 DEBUG(0,("Can't find 'single' process model_ops"));
 211                 return NT_STATUS_INTERNAL_ERROR;
 212         }
 213
 214         wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
 215         NT_STATUS_HAVE_NO_MEMORY(wrepl_in);
 216
 217         wrepl_in->service       = service;
 218         wrepl_in->partner       = partner;
 219
 220         status = stream_new_connection_merge(service->task->event_ctx, model_ops,
 221                                              sock, &wreplsrv_stream_ops, service->task->msg_ctx,
 222                                              wrepl_in, &conn);
 223         NT_STATUS_NOT_OK_RETURN(status);
 224
 225         /*
 226          * make the wreplsrv_in_connection structure a child of the
 227          * stream_connection, to match the hierachie of wreplsrv_accept
 228          */
 229         wrepl_in->conn          = conn;
 230         talloc_steal(conn, wrepl_in);
 231
 232         /*
 233          * now update the packet handling callback,...
 234          */
 235         wrepl_in->packet        = talloc_steal(wrepl_in, packet);
 236         packet_set_private(wrepl_in->packet, wrepl_in);
 237         packet_set_socket(wrepl_in->packet, conn->socket);
 238         packet_set_callback(wrepl_in->packet, wreplsrv_recv_request);
 239         packet_set_full_request(wrepl_in->packet, packet_full_request_u32);
 240         packet_set_error_handler(wrepl_in->packet, wreplsrv_recv_error);
 241         packet_set_event_context(wrepl_in->packet, conn->event.ctx);
 242         packet_set_fde(wrepl_in->packet, conn->event.fde);
 243         packet_set_serialise(wrepl_in->packet);
 244
 245         *_wrepl_in = wrepl_in;
 246         return NT_STATUS_OK;
 247 }
 248
 249 /*
 250   startup the wrepl port 42 server sockets
 251 */
 252 NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service)
 253 {
 254         NTSTATUS status;
 255         struct task_server *task = service->task;
 256         const struct model_ops *model_ops;
 257         const char *address;
 258         uint16_t port = WINS_REPLICATION_PORT;
 259
 260         /* within the wrepl task we want to be a single process, so
 261            ask for the single process model ops and pass these to the
 262            stream_setup_socket() call. */
 263         model_ops = process_model_byname("single");
 264         if (!model_ops) {
 265                 DEBUG(0,("Can't find 'single' process model_ops"));
 266                 return NT_STATUS_INTERNAL_ERROR;
 267         }
 268
 269         if (lp_interfaces() && lp_bind_interfaces_only()) {
 270                 int num_interfaces = iface_count();
 271                 int i;
 272
 273                 /* We have been given an interfaces line, and been
 274                    told to only bind to those interfaces. Create a
 275                    socket per interface and bind to only these.
 276                 */
 277                 for(i = 0; i < num_interfaces; i++) {
 278                         address = iface_n_ip(i);
 279                         status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
 280                                                      "ipv4", address, &port, service);
 281                         if (!NT_STATUS_IS_OK(status)) {
 282                                 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 283                                          address, port, nt_errstr(status)));
 284                                 return status;
 285                         }
 286                 }
 287         } else {
 288                 address = lp_socket_address();
 289                 status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
 290                                              "ipv4", address, &port, service);
 291                 if (!NT_STATUS_IS_OK(status)) {
 292                         DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 293                                  address, port, nt_errstr(status)));
 294                         return status;
 295                 }
 296         }
 297
 298         return NT_STATUS_OK;
 299 }