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
  59         call = talloc_zero(wreplconn, struct wreplsrv_in_call);
  60         NT_STATUS_HAVE_NO_MEMORY(call);
  61         call->wreplconn = wreplconn;
  62         talloc_steal(call, blob.data);
  63
  64         packet_in_blob.data = blob.data + 4;
  65         packet_in_blob.length = blob.length - 4;
  66
  67         status = ndr_pull_struct_blob(&packet_in_blob, call, &call->req_packet,
  68                                       (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
  69         NT_STATUS_NOT_OK_RETURN(status);
  70
  71         if (DEBUGLVL(10)) {
  72                 DEBUG(10,("Received WINS-Replication packet of length %u\n",
  73                           (unsigned)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         struct socket_address *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
 175         peer_ip = socket_get_peer_addr(conn->socket, wreplconn);
 176         if (!peer_ip) {
 177                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: could not obtain peer IP from kernel");
 178                 return;
 179         }
 180
 181         wreplconn->partner      = wreplsrv_find_partner(service, peer_ip->addr);
 182
 183         conn->private = wreplconn;
 184
 185         irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
 186 }
 187
 188 static const struct stream_server_ops wreplsrv_stream_ops = {
 189         .name                   = "wreplsrv",
 190         .accept_connection      = wreplsrv_accept,
 191         .recv_handler           = wreplsrv_recv,
 192         .send_handler           = wreplsrv_send,
 193 };
 194
 195 /*
 196   called when we get a new connection
 197 */
 198 NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
 199                                       struct socket_context *sock,
 200                                       struct packet_context *packet,
 201                                       struct wreplsrv_in_connection **_wrepl_in)
 202 {
 203         struct wreplsrv_service *service = partner->service;
 204         struct wreplsrv_in_connection *wrepl_in;
 205         const struct model_ops *model_ops;
 206         struct stream_connection *conn;
 207         NTSTATUS status;
 208
 209         /* within the wrepl task we want to be a single process, so
 210            ask for the single process model ops and pass these to the
 211            stream_setup_socket() call. */
 212         model_ops = process_model_byname("single");
 213         if (!model_ops) {
 214                 DEBUG(0,("Can't find 'single' process model_ops"));
 215                 return NT_STATUS_INTERNAL_ERROR;
 216         }
 217
 218         wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
 219         NT_STATUS_HAVE_NO_MEMORY(wrepl_in);
 220
 221         wrepl_in->service       = service;
 222         wrepl_in->partner       = partner;
 223
 224         status = stream_new_connection_merge(service->task->event_ctx, model_ops,
 225                                              sock, &wreplsrv_stream_ops, service->task->msg_ctx,
 226                                              wrepl_in, &conn);
 227         NT_STATUS_NOT_OK_RETURN(status);
 228
 229         /*
 230          * make the wreplsrv_in_connection structure a child of the
 231          * stream_connection, to match the hierachie of wreplsrv_accept
 232          */
 233         wrepl_in->conn          = conn;
 234         talloc_steal(conn, wrepl_in);
 235
 236         /*
 237          * now update the packet handling callback,...
 238          */
 239         wrepl_in->packet        = talloc_steal(wrepl_in, packet);
 240         packet_set_private(wrepl_in->packet, wrepl_in);
 241         packet_set_socket(wrepl_in->packet, conn->socket);
 242         packet_set_callback(wrepl_in->packet, wreplsrv_recv_request);
 243         packet_set_full_request(wrepl_in->packet, packet_full_request_u32);
 244         packet_set_error_handler(wrepl_in->packet, wreplsrv_recv_error);
 245         packet_set_event_context(wrepl_in->packet, conn->event.ctx);
 246         packet_set_fde(wrepl_in->packet, conn->event.fde);
 247         packet_set_serialise(wrepl_in->packet);
 248
 249         *_wrepl_in = wrepl_in;
 250         return NT_STATUS_OK;
 251 }
 252
 253 /*
 254   startup the wrepl port 42 server sockets
 255 */
 256 NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service)
 257 {
 258         NTSTATUS status;
 259         struct task_server *task = service->task;
 260         const struct model_ops *model_ops;
 261         const char *address;
 262         uint16_t port = WINS_REPLICATION_PORT;
 263
 264         /* within the wrepl task we want to be a single process, so
 265            ask for the single process model ops and pass these to the
 266            stream_setup_socket() call. */
 267         model_ops = process_model_byname("single");
 268         if (!model_ops) {
 269                 DEBUG(0,("Can't find 'single' process model_ops"));
 270                 return NT_STATUS_INTERNAL_ERROR;
 271         }
 272
 273         if (lp_interfaces() && lp_bind_interfaces_only()) {
 274                 int num_interfaces = iface_count();
 275                 int i;
 276
 277                 /* We have been given an interfaces line, and been
 278                    told to only bind to those interfaces. Create a
 279                    socket per interface and bind to only these.
 280                 */
 281                 for(i = 0; i < num_interfaces; i++) {
 282                         address = iface_n_ip(i);
 283                         status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
 284                                                      "ipv4", address, &port, service);
 285                         if (!NT_STATUS_IS_OK(status)) {
 286                                 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 287                                          address, port, nt_errstr(status)));
 288                                 return status;
 289                         }
 290                 }
 291         } else {
 292                 address = lp_socket_address();
 293                 status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
 294                                              "ipv4", address, &port, service);
 295                 if (!NT_STATUS_IS_OK(status)) {
 296                         DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
 297                                  address, port, nt_errstr(status)));
 298                         return status;
 299                 }
 300         }
 301
 302         return NT_STATUS_OK;
 303 }