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,
  92                                        lp_iconv_convenience(global_loadparm),
  93                                        &packet_out_wrap,
  94                                       (ndr_push_flags_fn_t)ndr_push_wrepl_wrap);
  95         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  96                 return ndr_map_error2ntstatus(ndr_err);
  97         }
  98
  99         if (DEBUGLVL(10)) {
 100                 DEBUG(10,("Sending WINS-Replication packet of length %d\n", (int)packet_out_blob.length));
 101                 NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet);
 102         }
 103
 104         if (call->terminate_after_send) {
 105                 struct wreplsrv_in_connection **tas;
 106                 tas = talloc(packet_out_blob.data, struct wreplsrv_in_connection *);
 107                 NT_STATUS_HAVE_NO_MEMORY(tas);
 108                 *tas = wreplconn;
 109                 talloc_set_destructor(tas, terminate_after_send_destructor);
 110         }
 111
 112         status = packet_send(wreplconn->packet, packet_out_blob);
 113         NT_STATUS_NOT_OK_RETURN(status);
 114
 115         talloc_free(call);
 116         return NT_STATUS_OK;
 117 }
 118
 119 /*
 120   called when the socket becomes readable
 121 */
 122 static void wreplsrv_recv(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
 127         packet_recv(wreplconn->packet);
 128 }
 129
 130 /*
 131   called when the socket becomes writable
 132 */
 133 static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
 134 {
 135         struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private,
 136                                                                    struct wreplsrv_in_connection);
 137         packet_queue_run(wreplconn->packet);
 138 }
 139
 140 /*
 141   handle socket recv errors
 142 */
 143 static void wreplsrv_recv_error(void *private, NTSTATUS status)
 144 {
 145         struct wreplsrv_in_connection *wreplconn = talloc_get_type(private,
 146                                                                    struct wreplsrv_in_connection);
 147         wreplsrv_terminate_in_connection(wreplconn, nt_errstr(status));
 148 }
 149
 150 /*
 151   called when we get a new connection
 152 */
 153 static void wreplsrv_accept(struct stream_connection *conn)
 154 {
 155         struct wreplsrv_service *service = talloc_get_type(conn->private, struct wreplsrv_service);
 156         struct wreplsrv_in_connection *wreplconn;
 157         struct socket_address *peer_ip;
 158
 159         wreplconn = talloc_zero(conn, struct wreplsrv_in_connection);
 160         if (!wreplconn) {
 161                 stream_terminate_connection(conn, "wreplsrv_accept: out of memory");
 162                 return;
 163         }
 164
 165         wreplconn->packet = packet_init(wreplconn);
 166         if (!wreplconn->packet) {
 167                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: out of memory");
 168                 return;
 169         }
 170         packet_set_private(wreplconn->packet, wreplconn);
 171         packet_set_socket(wreplconn->packet, conn->socket);
 172         packet_set_callback(wreplconn->packet, wreplsrv_recv_request);
 173         packet_set_full_request(wreplconn->packet, packet_full_request_u32);
 174         packet_set_error_handler(wreplconn->packet, wreplsrv_recv_error);
 175         packet_set_event_context(wreplconn->packet, conn->event.ctx);
 176         packet_set_fde(wreplconn->packet, conn->event.fde);
 177         packet_set_serialise(wreplconn->packet);
 178
 179         wreplconn->conn         = conn;
 180         wreplconn->service      = service;
 181
 182         peer_ip = socket_get_peer_addr(conn->socket, wreplconn);
 183         if (!peer_ip) {
 184                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: could not obtain peer IP from kernel");
 185                 return;
 186         }
 187
 188         wreplconn->partner      = wreplsrv_find_partner(service, peer_ip->addr);
 189
 190         conn->private = wreplconn;
 191
 192         irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
 193 }
 194
 195 static const struct stream_server_ops wreplsrv_stream_ops = {
 196         .name                   = "wreplsrv",
 197         .accept_connection      = wreplsrv_accept,
 198         .recv_handler           = wreplsrv_recv,
 199         .send_handler           = wreplsrv_send,
 200 };
 201
 202 /*
 203   called when we get a new connection
 204 */
 205 NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
 206                                       struct socket_context *sock,
 207                                       struct packet_context *packet,
 208                                       struct wreplsrv_in_connection **_wrepl_in)
 209 {
 210         struct wreplsrv_service *service = partner->service;
 211         struct wreplsrv_in_connection *wrepl_in;
 212         const struct model_ops *model_ops;
 213         struct stream_connection *conn;
 214         NTSTATUS status;
 215
 216         /* within the wrepl task we want to be a single process, so
 217            ask for the single process model ops and pass these to the
 218            stream_setup_socket() call. */
 219         model_ops = process_model_byname("single");
 220         if (!model_ops) {
 221                 DEBUG(0,("Can't find 'single' process model_ops"));
 222                 return NT_STATUS_INTERNAL_ERROR;
 223         }
 224
 225         wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
 226         NT_STATUS_HAVE_NO_MEMORY(wrepl_in);
 227
 228         wrepl_in->service       = service;
 229         wrepl_in->partner       = partner;
 230
 231         status = stream_new_connection_merge(service->task->event_ctx, model_ops,
 232                                              sock, &wreplsrv_stream_ops, service->task->msg_ctx,
 233                                              wrepl_in, &conn);
 234         NT_STATUS_NOT_OK_RETURN(status);
 235
 236         /*
 237          * make the wreplsrv_in_connection structure a child of the
 238          * stream_connection, to match the hierachie of wreplsrv_accept
 239          */
 240         wrepl_in->conn          = conn;
 241         talloc_steal(conn, wrepl_in);
 242
 243         /*
 244          * now update the packet handling callback,...
 245          */
 246         wrepl_in->packet        = talloc_steal(wrepl_in, packet);
 247         packet_set_private(wrepl_in->packet, wrepl_in);
 248         packet_set_socket(wrepl_in->packet, conn->socket);
 249         packet_set_callback(wrepl_in->packet, wreplsrv_recv_request);
 250         packet_set_full_request(wrepl_in->packet, packet_full_request_u32);
 251         packet_set_error_handler(wrepl_in->packet, wreplsrv_recv_error);
 252         packet_set_event_context(wrepl_in->packet, conn->event.ctx);
 253         packet_set_fde(wrepl_in->packet, conn->event.fde);
 254         packet_set_serialise(wrepl_in->packet);
 255
 256         *_wrepl_in = wrepl_in;
 257         return NT_STATUS_OK;
 258 }
 259
 260 /*
 261   startup the wrepl port 42 server sockets
 262 */
 263 NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service, struct loadparm_context *lp_ctx)
 264 {
 265         NTSTATUS status;
 266         struct task_server *task = service->task;
 267         const struct model_ops *model_ops;
 268         const char *address;
 269         uint16_t port = WINS_REPLICATION_PORT;
 270
 271         /* within the wrepl task we want to be a single process, so
 272            ask for the single process model ops and pass these to the
 273            stream_setup_socket() call. */
 274         model_ops = process_model_byname("single");
 275         if (!model_ops) {
 276                 DEBUG(0,("Can't find 'single' process model_ops"));
 277                 return NT_STATUS_INTERNAL_ERROR;
 278         }
 279
 280         if (lp_interfaces(lp_ctx) && lp_bind_interfaces_only(lp_ctx)) {
 281                 int num_interfaces;
 282                 int i;
 283                 struct interface *ifaces;
 284
 285                 load_interfaces(task, lp_interfaces(lp_ctx), &ifaces);
 286
 287                 num_interfaces = iface_count(ifaces);
 288
 289                 /* We have been given an interfaces line, and been
 290                    told to only bind to those interfaces. Create a
 291                    socket per interface and bind to only these.
 292                 */
 293                 for(i = 0; i < num_interfaces; i++) {
 294                         address = iface_n_ip(ifaces, i);
 295                         status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
 296                                                      "ipv4", address, &port,
 297                                                       lp_socket_options(task->lp_ctx),
 298                                                      service);
 299                         if (!NT_STATUS_IS_OK(status)) {
 300                                 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 301                                          address, port, nt_errstr(status)));
 302                                 return status;
 303                         }
 304                 }
 305         } else {
 306                 address = lp_socket_address(lp_ctx);
 307                 status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
 308                                              "ipv4", address, &port, lp_socket_options(task->lp_ctx),
 309                                              service);
 310                 if (!NT_STATUS_IS_OK(status)) {
 311                         DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 312                                  address, port, nt_errstr(status)));
 313                         return status;
 314                 }
 315         }
 316
 317         return NT_STATUS_OK;
 318 }