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