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 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 "dlinklist.h"
  25 #include "lib/events/events.h"
  26 #include "lib/socket/socket.h"
  27 #include "lib/stream/packet.h"
  28 #include "smbd/service_task.h"
  29 #include "smbd/service_stream.h"
  30 #include "lib/messaging/irpc.h"
  31 #include "librpc/gen_ndr/ndr_winsrepl.h"
  32 #include "wrepl_server/wrepl_server.h"
  33 #include "nbt_server/wins/winsdb.h"
  34 #include "ldb/include/ldb.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(void *ptr)
  42 {
  43         struct wreplsrv_in_connection **tas = talloc_get_type(ptr, struct wreplsrv_in_connection *);
  44         wreplsrv_terminate_in_connection(*tas, "wreplsrv_in_connection: terminate_after_send");
  45         return 0;
  46 }
  47
  48 /*
  49   receive some data on a WREPL connection
  50 */
  51 static NTSTATUS wreplsrv_recv_request(void *private, DATA_BLOB blob)
  52 {
  53         struct wreplsrv_in_connection *wreplconn = talloc_get_type(private, struct wreplsrv_in_connection);
  54         struct wreplsrv_in_call *call;
  55         DATA_BLOB packet_in_blob;
  56         DATA_BLOB packet_out_blob;
  57         struct wrepl_wrap packet_out_wrap;
  58         NTSTATUS status;
  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         status = ndr_pull_struct_blob(&packet_in_blob, call, &call->req_packet,
  69                                       (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
  70         NT_STATUS_NOT_OK_RETURN(status);
  71
  72         if (DEBUGLVL(10)) {
  73                 DEBUG(10,("Received WINS-Replication packet of length %u\n", packet_in_blob.length + 4));
  74                 NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet);
  75         }
  76
  77         status = wreplsrv_in_call(call);
  78         NT_STATUS_IS_ERR_RETURN(status);
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 /* w2k just ignores invalid packets, so we do */
  81                 DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n"));
  82                 talloc_free(call);
  83                 return NT_STATUS_OK;
  84         }
  85
  86         /* and now encode the reply */
  87         packet_out_wrap.packet = call->rep_packet;
  88         status = ndr_push_struct_blob(&packet_out_blob, call, &packet_out_wrap,
  89                                       (ndr_push_flags_fn_t)ndr_push_wrepl_wrap);
  90         NT_STATUS_NOT_OK_RETURN(status);
  91
  92         if (DEBUGLVL(10)) {
  93                 DEBUG(10,("Sending WINS-Replication packet of length %d\n", (int)packet_out_blob.length));
  94                 NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet);
  95         }
  96
  97         if (call->terminate_after_send) {
  98                 struct wreplsrv_in_connection **tas;
  99                 tas = talloc(packet_out_blob.data, struct wreplsrv_in_connection *);
 100                 NT_STATUS_HAVE_NO_MEMORY(tas);
 101                 *tas = wreplconn;
 102                 talloc_set_destructor(tas, terminate_after_send_destructor);
 103         }
 104
 105         status = packet_send(wreplconn->packet, packet_out_blob);
 106         NT_STATUS_NOT_OK_RETURN(status);
 107
 108         talloc_free(call);
 109         return NT_STATUS_OK;
 110 }
 111
 112 /*
 113   called when the socket becomes readable
 114 */
 115 static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags)
 116 {
 117         struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private,
 118                                                                    struct wreplsrv_in_connection);
 119
 120         packet_recv(wreplconn->packet);
 121 }
 122
 123 /*
 124   called when the socket becomes writable
 125 */
 126 static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
 127 {
 128         struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private,
 129                                                                    struct wreplsrv_in_connection);
 130         packet_queue_run(wreplconn->packet);
 131 }
 132
 133 /*
 134   handle socket recv errors
 135 */
 136 static void wreplsrv_recv_error(void *private, NTSTATUS status)
 137 {
 138         struct wreplsrv_in_connection *wreplconn = talloc_get_type(private,
 139                                                                    struct wreplsrv_in_connection);
 140         wreplsrv_terminate_in_connection(wreplconn, nt_errstr(status));
 141 }
 142
 143 /*
 144   called when we get a new connection
 145 */
 146 static void wreplsrv_accept(struct stream_connection *conn)
 147 {
 148         struct wreplsrv_service *service = talloc_get_type(conn->private, struct wreplsrv_service);
 149         struct wreplsrv_in_connection *wreplconn;
 150         const char *peer_ip;
 151
 152         wreplconn = talloc_zero(conn, struct wreplsrv_in_connection);
 153         if (!wreplconn) {
 154                 stream_terminate_connection(conn, "wreplsrv_accept: out of memory");
 155                 return;
 156         }
 157
 158         wreplconn->packet = packet_init(wreplconn);
 159         if (!wreplconn->packet) {
 160                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: out of memory");
 161                 return;
 162         }
 163         packet_set_private(wreplconn->packet, wreplconn);
 164         packet_set_socket(wreplconn->packet, conn->socket);
 165         packet_set_callback(wreplconn->packet, wreplsrv_recv_request);
 166         packet_set_full_request(wreplconn->packet, packet_full_request_u32);
 167         packet_set_error_handler(wreplconn->packet, wreplsrv_recv_error);
 168         packet_set_event_context(wreplconn->packet, conn->event.ctx);
 169         packet_set_fde(wreplconn->packet, conn->event.fde);
 170         packet_set_serialise(wreplconn->packet);
 171
 172         wreplconn->conn         = conn;
 173         wreplconn->service      = service;
 174         wreplconn->our_ip       = socket_get_my_addr(conn->socket, wreplconn);
 175         if (!wreplconn->our_ip) {
 176                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: out of memory");
 177                 return;
 178         }
 179
 180         peer_ip = socket_get_peer_addr(conn->socket, wreplconn);
 181         if (!peer_ip) {
 182                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: out of memory");
 183                 return;
 184         }
 185
 186         wreplconn->partner      = wreplsrv_find_partner(service, peer_ip);
 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         wrepl_in->our_ip        = socket_get_my_addr(sock, wrepl_in);
 229         NT_STATUS_HAVE_NO_MEMORY(wrepl_in->our_ip);
 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)
 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_bind_interfaces_only()) {
 281                 int num_interfaces = iface_count();
 282                 int i;
 283
 284                 /* We have been given an interfaces line, and been
 285                    told to only bind to those interfaces. Create a
 286                    socket per interface and bind to only these.
 287                 */
 288                 for(i = 0; i < num_interfaces; i++) {
 289                         address = iface_n_ip(i);
 290                         status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
 291                                                      "ipv4", address, &port, service);
 292                         if (!NT_STATUS_IS_OK(status)) {
 293                                 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 294                                          address, port, nt_errstr(status)));
 295                                 return status;
 296                         }
 297                 }
 298         } else {
 299                 address = lp_socket_address();
 300                 status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
 301                                              "ipv4", address, &port, service);
 302                 if (!NT_STATUS_IS_OK(status)) {
 303                         DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 304                                  address, port, nt_errstr(status)));
 305                         return status;
 306                 }
 307         }
 308
 309         return NT_STATUS_OK;
 310 }