9b0f5522e518239d70d750f241a330d228e5f4ee
[kai/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
35 void wreplsrv_terminate_in_connection(struct wreplsrv_in_connection *wreplconn, const char *reason)
36 {
37         stream_terminate_connection(wreplconn->conn, reason);
38 }
39
40 static int terminate_after_send_destructor(struct wreplsrv_in_connection **tas)
41 {
42         wreplsrv_terminate_in_connection(*tas, "wreplsrv_in_connection: terminate_after_send");
43         return 0;
44 }
45
46 /*
47   receive some data on a WREPL connection
48 */
49 static NTSTATUS wreplsrv_recv_request(void *private, DATA_BLOB blob)
50 {
51         struct wreplsrv_in_connection *wreplconn = talloc_get_type(private, struct wreplsrv_in_connection);
52         struct wreplsrv_in_call *call;
53         DATA_BLOB packet_in_blob;
54         DATA_BLOB packet_out_blob;
55         struct wrepl_wrap packet_out_wrap;
56         NTSTATUS status;
57
58         call = talloc_zero(wreplconn, struct wreplsrv_in_call);
59         NT_STATUS_HAVE_NO_MEMORY(call);
60         call->wreplconn = wreplconn;
61         talloc_steal(call, blob.data);
62
63         packet_in_blob.data = blob.data + 4;
64         packet_in_blob.length = blob.length - 4;
65
66         status = ndr_pull_struct_blob(&packet_in_blob, call, &call->req_packet,
67                                       (ndr_pull_flags_fn_t)ndr_pull_wrepl_packet);
68         NT_STATUS_NOT_OK_RETURN(status);
69
70         if (DEBUGLVL(10)) {
71                 DEBUG(10,("Received WINS-Replication packet of length %u\n", 
72                           (unsigned)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 }