r26639: librpc: Pass iconv convenience on from RPC connection to NDR library, so...
[bbaumbach/samba-autobuild/.git] / 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, 
69                                        lp_iconv_convenience(global_loadparm),
70                                        &call->req_packet,
71                                        (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
72         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
73                 return ndr_map_error2ntstatus(ndr_err);
74         }
75
76         if (DEBUGLVL(10)) {
77                 DEBUG(10,("Received WINS-Replication packet of length %u\n", 
78                           (unsigned)packet_in_blob.length + 4));
79                 NDR_PRINT_DEBUG(wrepl_packet, &call->req_packet);
80         }
81
82         status = wreplsrv_in_call(call);
83         NT_STATUS_IS_ERR_RETURN(status);
84         if (!NT_STATUS_IS_OK(status)) {
85                 /* w2k just ignores invalid packets, so we do */
86                 DEBUG(10,("Received WINS-Replication packet was invalid, we just ignore it\n"));
87                 talloc_free(call);
88                 return NT_STATUS_OK;
89         }
90
91         /* and now encode the reply */
92         packet_out_wrap.packet = call->rep_packet;
93         ndr_err = ndr_push_struct_blob(&packet_out_blob, call, 
94                                        lp_iconv_convenience(global_loadparm),
95                                        &packet_out_wrap,
96                                       (ndr_push_flags_fn_t)ndr_push_wrepl_wrap);
97         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
98                 return ndr_map_error2ntstatus(ndr_err);
99         }
100
101         if (DEBUGLVL(10)) {
102                 DEBUG(10,("Sending WINS-Replication packet of length %d\n", (int)packet_out_blob.length));
103                 NDR_PRINT_DEBUG(wrepl_packet, &call->rep_packet);
104         }
105
106         if (call->terminate_after_send) {
107                 struct wreplsrv_in_connection **tas;
108                 tas = talloc(packet_out_blob.data, struct wreplsrv_in_connection *);
109                 NT_STATUS_HAVE_NO_MEMORY(tas);
110                 *tas = wreplconn;
111                 talloc_set_destructor(tas, terminate_after_send_destructor);
112         }
113
114         status = packet_send(wreplconn->packet, packet_out_blob);
115         NT_STATUS_NOT_OK_RETURN(status);
116
117         talloc_free(call);
118         return NT_STATUS_OK;
119 }
120
121 /*
122   called when the socket becomes readable
123 */
124 static void wreplsrv_recv(struct stream_connection *conn, uint16_t flags)
125 {
126         struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private,
127                                                                    struct wreplsrv_in_connection);
128
129         packet_recv(wreplconn->packet);
130 }
131
132 /*
133   called when the socket becomes writable
134 */
135 static void wreplsrv_send(struct stream_connection *conn, uint16_t flags)
136 {
137         struct wreplsrv_in_connection *wreplconn = talloc_get_type(conn->private,
138                                                                    struct wreplsrv_in_connection);
139         packet_queue_run(wreplconn->packet);
140 }
141
142 /*
143   handle socket recv errors
144 */
145 static void wreplsrv_recv_error(void *private, NTSTATUS status)
146 {
147         struct wreplsrv_in_connection *wreplconn = talloc_get_type(private,
148                                                                    struct wreplsrv_in_connection);
149         wreplsrv_terminate_in_connection(wreplconn, nt_errstr(status));
150 }
151
152 /*
153   called when we get a new connection
154 */
155 static void wreplsrv_accept(struct stream_connection *conn)
156 {
157         struct wreplsrv_service *service = talloc_get_type(conn->private, struct wreplsrv_service);
158         struct wreplsrv_in_connection *wreplconn;
159         struct socket_address *peer_ip;
160
161         wreplconn = talloc_zero(conn, struct wreplsrv_in_connection);
162         if (!wreplconn) {
163                 stream_terminate_connection(conn, "wreplsrv_accept: out of memory");
164                 return;
165         }
166
167         wreplconn->packet = packet_init(wreplconn);
168         if (!wreplconn->packet) {
169                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: out of memory");
170                 return;
171         }
172         packet_set_private(wreplconn->packet, wreplconn);
173         packet_set_socket(wreplconn->packet, conn->socket);
174         packet_set_callback(wreplconn->packet, wreplsrv_recv_request);
175         packet_set_full_request(wreplconn->packet, packet_full_request_u32);
176         packet_set_error_handler(wreplconn->packet, wreplsrv_recv_error);
177         packet_set_event_context(wreplconn->packet, conn->event.ctx);
178         packet_set_fde(wreplconn->packet, conn->event.fde);
179         packet_set_serialise(wreplconn->packet);
180
181         wreplconn->conn         = conn;
182         wreplconn->service      = service;
183
184         peer_ip = socket_get_peer_addr(conn->socket, wreplconn);
185         if (!peer_ip) {
186                 wreplsrv_terminate_in_connection(wreplconn, "wreplsrv_accept: could not obtain peer IP from kernel");
187                 return;
188         }
189
190         wreplconn->partner      = wreplsrv_find_partner(service, peer_ip->addr);
191
192         conn->private = wreplconn;
193
194         irpc_add_name(conn->msg_ctx, "wreplsrv_connection");
195 }
196
197 static const struct stream_server_ops wreplsrv_stream_ops = {
198         .name                   = "wreplsrv",
199         .accept_connection      = wreplsrv_accept,
200         .recv_handler           = wreplsrv_recv,
201         .send_handler           = wreplsrv_send,
202 };
203
204 /*
205   called when we get a new connection
206 */
207 NTSTATUS wreplsrv_in_connection_merge(struct wreplsrv_partner *partner,
208                                       struct socket_context *sock,
209                                       struct packet_context *packet,
210                                       struct wreplsrv_in_connection **_wrepl_in)
211 {
212         struct wreplsrv_service *service = partner->service;
213         struct wreplsrv_in_connection *wrepl_in;
214         const struct model_ops *model_ops;
215         struct stream_connection *conn;
216         NTSTATUS status;
217
218         /* within the wrepl task we want to be a single process, so
219            ask for the single process model ops and pass these to the
220            stream_setup_socket() call. */
221         model_ops = process_model_byname("single");
222         if (!model_ops) {
223                 DEBUG(0,("Can't find 'single' process model_ops"));
224                 return NT_STATUS_INTERNAL_ERROR;
225         }
226
227         wrepl_in = talloc_zero(partner, struct wreplsrv_in_connection);
228         NT_STATUS_HAVE_NO_MEMORY(wrepl_in);
229
230         wrepl_in->service       = service;
231         wrepl_in->partner       = partner;
232
233         status = stream_new_connection_merge(service->task->event_ctx, model_ops,
234                                              sock, &wreplsrv_stream_ops, service->task->msg_ctx,
235                                              wrepl_in, &conn);
236         NT_STATUS_NOT_OK_RETURN(status);
237
238         /*
239          * make the wreplsrv_in_connection structure a child of the 
240          * stream_connection, to match the hierachie of wreplsrv_accept
241          */
242         wrepl_in->conn          = conn;
243         talloc_steal(conn, wrepl_in);
244
245         /*
246          * now update the packet handling callback,...
247          */
248         wrepl_in->packet        = talloc_steal(wrepl_in, packet);
249         packet_set_private(wrepl_in->packet, wrepl_in);
250         packet_set_socket(wrepl_in->packet, conn->socket);
251         packet_set_callback(wrepl_in->packet, wreplsrv_recv_request);
252         packet_set_full_request(wrepl_in->packet, packet_full_request_u32);
253         packet_set_error_handler(wrepl_in->packet, wreplsrv_recv_error);
254         packet_set_event_context(wrepl_in->packet, conn->event.ctx);
255         packet_set_fde(wrepl_in->packet, conn->event.fde);
256         packet_set_serialise(wrepl_in->packet);
257
258         *_wrepl_in = wrepl_in;
259         return NT_STATUS_OK;
260 }
261
262 /*
263   startup the wrepl port 42 server sockets
264 */
265 NTSTATUS wreplsrv_setup_sockets(struct wreplsrv_service *service, struct loadparm_context *lp_ctx)
266 {
267         NTSTATUS status;
268         struct task_server *task = service->task;
269         const struct model_ops *model_ops;
270         const char *address;
271         uint16_t port = WINS_REPLICATION_PORT;
272
273         /* within the wrepl task we want to be a single process, so
274            ask for the single process model ops and pass these to the
275            stream_setup_socket() call. */
276         model_ops = process_model_byname("single");
277         if (!model_ops) {
278                 DEBUG(0,("Can't find 'single' process model_ops"));
279                 return NT_STATUS_INTERNAL_ERROR;
280         }
281
282         if (lp_interfaces(lp_ctx) && lp_bind_interfaces_only(lp_ctx)) {
283                 int num_interfaces;
284                 int i;
285                 struct interface *ifaces;
286
287                 load_interfaces(task, lp_interfaces(lp_ctx), &ifaces);
288
289                 num_interfaces = iface_count(ifaces);
290
291                 /* We have been given an interfaces line, and been 
292                    told to only bind to those interfaces. Create a
293                    socket per interface and bind to only these.
294                 */
295                 for(i = 0; i < num_interfaces; i++) {
296                         address = iface_n_ip(ifaces, i);
297                         status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
298                                                      "ipv4", address, &port, 
299                                                       lp_socket_options(task->lp_ctx), 
300                                                      service);
301                         if (!NT_STATUS_IS_OK(status)) {
302                                 DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
303                                          address, port, nt_errstr(status)));
304                                 return status;
305                         }
306                 }
307         } else {
308                 address = lp_socket_address(lp_ctx);
309                 status = stream_setup_socket(task->event_ctx, model_ops, &wreplsrv_stream_ops,
310                                              "ipv4", address, &port, lp_socket_options(task->lp_ctx), 
311                                              service);
312                 if (!NT_STATUS_IS_OK(status)) {
313                         DEBUG(0,("stream_setup_socket(address=%s,port=%u) failed - %s\n",
314                                  address, port, nt_errstr(status)));
315                         return status;
316                 }
317         }
318
319         return NT_STATUS_OK;
320 }