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 "param/param.h"
  35
  36 void wreplsrv_terminate_in_connection(struct wreplsrv_in_connection *wreplconn, const char *reason)
  37 {
  38         stream_terminate_connection(wreplconn->conn, reason);
  39 }
  40
  41 static int terminate_after_send_destructor(struct wreplsrv_in_connection **tas)
  42 {
  43         wreplsrv_terminate_in_connection(*tas, "wreplsrv_in_connection: terminate_after_send");
  44         return 0;
  45 }
  46
  47 /*
  48   receive some data on a WREPL connection
  49 */
  50 static NTSTATUS wreplsrv_recv_request(void *private, DATA_BLOB blob)
  51 {
  52         struct wreplsrv_in_connection *wreplconn = talloc_get_type(private, struct wreplsrv_in_connection);
  53         struct wreplsrv_in_call *call;
  54         DATA_BLOB packet_in_blob;
  55         DATA_BLOB packet_out_blob;
  56         struct wrepl_wrap packet_out_wrap;
  57         NTSTATUS status;
  58         enum ndr_err_code ndr_err;
  59
  60         call = talloc_zero(wreplconn, struct wreplsrv_in_call);
  61         NT_STATUS_HAVE_NO_MEMORY(call);
  62         call->wreplconn = wreplconn;
  63         talloc_steal(call, blob.data);
  64
  65         packet_in_blob.data = blob.data + 4;
  66         packet_in_blob.length = blob.length - 4;
  67
  68         ndr_err = ndr_pull_struct_blob(&packet_in_blob, call, &call->req_packet,
  69                                        (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
  70         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  71                 return ndr_map_error2ntstatus(ndr_err);
  72         }
  73
  74         if (DEBUGLVL(10)) {
  75                 DEBUG(10,("Received WINS-Replication packet of length %u\n",
  76                           (unsigned)packet_in_blob.length + 4));
  77                 NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet);
  78         }
  79
  80         status = wreplsrv_in_call(call);
  81         NT_STATUS_IS_ERR_RETURN(status);
  82         if (!NT_STATUS_IS_OK(status)) {
  83                 /* w2k just ignores invalid packets, so we do */
  84                 DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n"));
  85                 talloc_free(call);
  86                 return NT_STATUS_OK;
  87         }
  88
  89         /* and now encode the reply */
  90         packet_out_wrap.packet = call->rep_packet;
  91         ndr_err = ndr_push_struct_blob(&packet_out_blob, call, &packet_out_wrap,
  92                                       (ndr_push_flags_fn_t)ndr_push_wrepl_wrap);
  93         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  94                 return ndr_map_error2ntstatus(ndr_err);
  95         }
  96
  97         if (DEBUGLVL(10)) {
  98                 DEBUG(10,("Sending WINS-Replication packet of length %d\n", (int)packet_out_blob.length));
  99                 NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet);
 100         }
 101
 102         if (call->terminate_after_send) {
 103                 struct wreplsrv_in_connection **tas;
 104                 tas = talloc(packet_out_blob.data, struct wreplsrv_in_connection *);
 105                 NT_STATUS_HAVE_NO_MEMORY(tas);
 106                 *tas = wreplconn;
 107                 talloc_set_destructor(tas, terminate_after_send_destructor);
 108         }
 109
 110         status = packet_send(wreplconn->packet, packet_out_blob);
 111         NT_STATUS_NOT_OK_RETURN(status);
 112
 113         talloc_free(call);
 114         return NT_STATUS_OK;
 115 }
 116
 117 /*
 118   called when the socket becomes readable
 119 */
 120 static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags)
 121 {
 122         struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private,
 123                                                                    struct wreplsrv_in_connection);
 124
 125         packet_recv(wreplconn->packet);
 126 }
 127
 128 /*
 129   called when the socket becomes writable
 130 */
 131 static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
 132 {
 133         struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private,
 134                                                                    struct wreplsrv_in_connection);
 135         packet_queue_run(wreplconn->packet);
 136 }
 137
 138 /*
 139   handle socket recv errors
 140 */
 141 static void wreplsrv_recv_error(void *private, NTSTATUS status)
 142 {
 143         struct wreplsrv_in_connection *wreplconn = talloc_get_type(private,
 144                                                                    struct wreplsrv_in_connection);
 145         wreplsrv_terminate_in_connection(wreplconn, nt_errstr(status));
 146 }
 147
 148 /*
 149   called when we get a new connection
 150 */
 151 static void wreplsrv_accept(struct stream_connection *conn)
 152 {
 153         struct wreplsrv_service *service = talloc_get_type(conn->private, struct wreplsrv_service);
 154         struct wreplsrv_in_connection *wreplconn;
 155         struct socket_address *peer_ip;
 156
 157         wreplconn = talloc_zero(conn, struct wreplsrv_in_connection);
 158         if (!wreplconn) {
 159                 stream_terminate_connection(conn, "wreplsrv_accept: out of memory");
 160                 return;
 161         }
 162
 163         wreplconn->packet = packet_init(wreplconn);
 164         if (!wreplconn->packet) {
 165                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: out of memory");
 166                 return;
 167         }
 168         packet_set_private(wreplconn->packet, wreplconn);
 169         packet_set_socket(wreplconn->packet, conn->socket);
 170         packet_set_callback(wreplconn->packet, wreplsrv_recv_request);
 171         packet_set_full_request(wreplconn->packet, packet_full_request_u32);
 172         packet_set_error_handler(wreplconn->packet, wreplsrv_recv_error);
 173         packet_set_event_context(wreplconn->packet, conn->event.ctx);
 174         packet_set_fde(wreplconn->packet, conn->event.fde);
 175         packet_set_serialise(wreplconn->packet);
 176
 177         wreplconn->conn         = conn;
 178         wreplconn->service      = service;
 179
 180         peer_ip = socket_get_peer_addr(conn->socket, wreplconn);
 181         if (!peer_ip) {
 182                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: could not obtain peer IP from kernel");
 183                 return;
 184         }
 185
 186         wreplconn->partner      = wreplsrv_find_partner(service, peer_ip->addr);
 187
 188         conn->private = wreplconn;
 189
 190         irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
 191 }
 192
 193 static const struct stream_server_ops wreplsrv_stream_ops = {
 194         .name                   = "wreplsrv",
 195         .accept_connection      = wreplsrv_accept,
 196         .recv_handler           = wreplsrv_recv,
 197         .send_handler           = wreplsrv_send,
 198 };
 199
 200 /*
 201   called when we get a new connection
 202 */
 203 NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
 204                                       struct socket_context *sock,
 205                                       struct packet_context *packet,
 206                                       struct wreplsrv_in_connection **_wrepl_in)
 207 {
 208         struct wreplsrv_service *service = partner->service;
 209         struct wreplsrv_in_connection *wrepl_in;
 210         const struct model_ops *model_ops;
 211         struct stream_connection *conn;
 212         NTSTATUS status;
 213
 214         /* within the wrepl task we want to be a single process, so
 215            ask for the single process model ops and pass these to the
 216            stream_setup_socket() call. */
 217         model_ops = process_model_byname("single");
 218         if (!model_ops) {
 219                 DEBUG(0,("Can't find 'single' process model_ops"));
 220                 return NT_STATUS_INTERNAL_ERROR;
 221         }
 222
 223         wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
 224         NT_STATUS_HAVE_NO_MEMORY(wrepl_in);
 225
 226         wrepl_in->service       = service;
 227         wrepl_in->partner       = partner;
 228
 229         status = stream_new_connection_merge(service->task->event_ctx, model_ops,
 230                                              sock, &wreplsrv_stream_ops, service->task->msg_ctx,
 231                                              wrepl_in, &conn);
 232         NT_STATUS_NOT_OK_RETURN(status);
 233
 234         /*
 235          * make the wreplsrv_in_connection structure a child of the
 236          * stream_connection, to match the hierachie of wreplsrv_accept
 237          */
 238         wrepl_in->conn          = conn;
 239         talloc_steal(conn, wrepl_in);
 240
 241         /*
 242          * now update the packet handling callback,...
 243          */
 244         wrepl_in->packet        = talloc_steal(wrepl_in, packet);
 245         packet_set_private(wrepl_in->packet, wrepl_in);
 246         packet_set_socket(wrepl_in->packet, conn->socket);
 247         packet_set_callback(wrepl_in->packet, wreplsrv_recv_request);
 248         packet_set_full_request(wrepl_in->packet, packet_full_request_u32);
 249         packet_set_error_handler(wrepl_in->packet, wreplsrv_recv_error);
 250         packet_set_event_context(wrepl_in->packet, conn->event.ctx);
 251         packet_set_fde(wrepl_in->packet, conn->event.fde);
 252         packet_set_serialise(wrepl_in->packet);
 253
 254         *_wrepl_in = wrepl_in;
 255         return NT_STATUS_OK;
 256 }
 257
 258 /*
 259   startup the wrepl port 42 server sockets
 260 */
 261 NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service, struct loadparm_context *lp_ctx)
 262 {
 263         NTSTATUS status;
 264         struct task_server *task = service->task;
 265         const struct model_ops *model_ops;
 266         const char *address;
 267         uint16_t port = WINS_REPLICATION_PORT;
 268
 269         /* within the wrepl task we want to be a single process, so
 270            ask for the single process model ops and pass these to the
 271            stream_setup_socket() call. */
 272         model_ops = process_model_byname("single");
 273         if (!model_ops) {
 274                 DEBUG(0,("Can't find 'single' process model_ops"));
 275                 return NT_STATUS_INTERNAL_ERROR;
 276         }
 277
 278         if (lp_interfaces(lp_ctx) && lp_bind_interfaces_only(lp_ctx)) {
 279                 int num_interfaces;
 280                 int i;
 281                 struct interface *ifaces;
 282
 283                 load_interfaces(task, lp_interfaces(lp_ctx), &ifaces);
 284
 285                 num_interfaces = iface_count(ifaces);
 286
 287                 /* We have been given an interfaces line, and been
 288                    told to only bind to those interfaces. Create a
 289                    socket per interface and bind to only these.
 290                 */
 291                 for(i = 0; i < num_interfaces; i++) {
 292                         address = iface_n_ip(ifaces, i);
 293                         status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
 294                                                      "ipv4", address, &port,
 295                                                       lp_socket_options(task->lp_ctx),
 296                                                      service);
 297                         if (!NT_STATUS_IS_OK(status)) {
 298                                 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 299                                          address, port, nt_errstr(status)));
 300                                 return status;
 301                         }
 302                 }
 303         } else {
 304                 address = lp_socket_address(lp_ctx);
 305                 status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
 306                                              "ipv4", address, &port, lp_socket_options(task->lp_ctx),
 307                                              service);
 308                 if (!NT_STATUS_IS_OK(status)) {
 309                         DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 310                                  address, port, nt_errstr(status)));
 311                         return status;
 312                 }
 313         }
 314
 315         return NT_STATUS_OK;
 316 }