Remove useless layer of indirection, where every service called
[jelmer/samba4-debian.git] / source / smb_server / smb_server.c
1 /* 
2    Unix SMB/CIFS implementation.
3    process incoming packets - main loop
4    Copyright (C) Andrew Tridgell        2004-2005
5    Copyright (C) Stefan Metzmacher      2004-2005
6    
7    This program is free software; you can redistribute it and/or modify
8    it under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 3 of the License, or
10    (at your option) any later version.
11    
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16    
17    You should have received a copy of the GNU General Public License
18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22 #include "smbd/service_task.h"
23 #include "smbd/service_stream.h"
24 #include "smbd/service.h"
25 #include "smb_server/smb_server.h"
26 #include "smb_server/service_smb_proto.h"
27 #include "lib/messaging/irpc.h"
28 #include "lib/stream/packet.h"
29 #include "libcli/smb2/smb2.h"
30 #include "smb_server/smb2/smb2_server.h"
31 #include "system/network.h"
32 #include "lib/socket/netif.h"
33 #include "param/share.h"
34 #include "dsdb/samdb/samdb.h"
35 #include "param/param.h"
36
37 static NTSTATUS smbsrv_recv_generic_request(void *private, DATA_BLOB blob)
38 {
39         NTSTATUS status;
40         struct smbsrv_connection *smb_conn = talloc_get_type(private, struct smbsrv_connection);
41         uint32_t protocol_version;
42
43         /* see if its a special NBT packet */
44         if (CVAL(blob.data,0) != 0) {
45                 status = smbsrv_init_smb_connection(smb_conn, smb_conn->lp_ctx);
46                 NT_STATUS_NOT_OK_RETURN(status);
47                 packet_set_callback(smb_conn->packet, smbsrv_recv_smb_request);
48                 return smbsrv_recv_smb_request(smb_conn, blob);
49         }
50
51         if (blob.length < (NBT_HDR_SIZE + MIN_SMB_SIZE)) {
52                 DEBUG(2,("Invalid SMB packet length count %ld\n", (long)blob.length));
53                 smbsrv_terminate_connection(smb_conn, "Invalid SMB packet");
54                 return NT_STATUS_OK;
55         }
56
57         protocol_version = IVAL(blob.data, NBT_HDR_SIZE);
58
59         switch (protocol_version) {
60         case SMB_MAGIC:
61                 status = smbsrv_init_smb_connection(smb_conn, smb_conn->lp_ctx);
62                 NT_STATUS_NOT_OK_RETURN(status);
63                 packet_set_callback(smb_conn->packet, smbsrv_recv_smb_request);
64                 return smbsrv_recv_smb_request(smb_conn, blob);
65         case SMB2_MAGIC:
66                 if (lp_srv_maxprotocol(smb_conn->lp_ctx) < PROTOCOL_SMB2) break;
67                 status = smbsrv_init_smb2_connection(smb_conn);
68                 NT_STATUS_NOT_OK_RETURN(status);
69                 packet_set_callback(smb_conn->packet, smbsrv_recv_smb2_request);
70                 return smbsrv_recv_smb2_request(smb_conn, blob);
71         }
72
73         DEBUG(2,("Invalid SMB packet: protocol prefix: 0x%08X\n", protocol_version));
74         smbsrv_terminate_connection(smb_conn, "NON-SMB packet");
75         return NT_STATUS_OK;
76 }
77
78 /*
79   close the socket and shutdown a server_context
80 */
81 void smbsrv_terminate_connection(struct smbsrv_connection *smb_conn, const char *reason)
82 {
83         stream_terminate_connection(smb_conn->connection, reason);
84 }
85
86 /*
87   called when a SMB socket becomes readable
88 */
89 static void smbsrv_recv(struct stream_connection *conn, uint16_t flags)
90 {
91         struct smbsrv_connection *smb_conn = talloc_get_type(conn->private,
92                                                              struct smbsrv_connection);
93
94         DEBUG(10,("smbsrv_recv\n"));
95
96         packet_recv(smb_conn->packet);
97 }
98
99 /*
100   called when a SMB socket becomes writable
101 */
102 static void smbsrv_send(struct stream_connection *conn, uint16_t flags)
103 {
104         struct smbsrv_connection *smb_conn = talloc_get_type(conn->private, 
105                                                              struct smbsrv_connection);
106         packet_queue_run(smb_conn->packet);
107 }
108
109 /*
110   handle socket recv errors
111 */
112 static void smbsrv_recv_error(void *private, NTSTATUS status)
113 {
114         struct smbsrv_connection *smb_conn = talloc_get_type(private, struct smbsrv_connection);
115         
116         smbsrv_terminate_connection(smb_conn, nt_errstr(status));
117 }
118
119 /*
120   initialise a server_context from a open socket and register a event handler
121   for reading from that socket
122 */
123 static void smbsrv_accept(struct stream_connection *conn)
124 {
125         struct smbsrv_connection *smb_conn;
126
127         DEBUG(5,("smbsrv_accept\n"));
128
129         smb_conn = talloc_zero(conn, struct smbsrv_connection);
130         if (!smb_conn) {
131                 stream_terminate_connection(conn, "out of memory");
132                 return;
133         }
134
135         smb_conn->packet = packet_init(smb_conn);
136         if (!smb_conn->packet) {
137                 smbsrv_terminate_connection(smb_conn, "out of memory");
138                 return;
139         }
140         packet_set_private(smb_conn->packet, smb_conn);
141         packet_set_socket(smb_conn->packet, conn->socket);
142         packet_set_callback(smb_conn->packet, smbsrv_recv_generic_request);
143         packet_set_full_request(smb_conn->packet, packet_full_request_nbt);
144         packet_set_error_handler(smb_conn->packet, smbsrv_recv_error);
145         packet_set_event_context(smb_conn->packet, conn->event.ctx);
146         packet_set_fde(smb_conn->packet, conn->event.fde);
147         packet_set_serialise(smb_conn->packet);
148
149         smb_conn->lp_ctx = global_loadparm;
150         smb_conn->connection = conn;
151         conn->private = smb_conn;
152
153         irpc_add_name(conn->msg_ctx, "smb_server");
154
155         smb_conn->statistics.connect_time = timeval_current();
156
157         smbsrv_management_init(smb_conn);
158
159         if (!NT_STATUS_IS_OK(share_get_context_by_name(smb_conn, lp_share_backend(smb_conn->lp_ctx), 
160                                                        smb_conn->lp_ctx, &(smb_conn->share_context)))) {
161                 smbsrv_terminate_connection(smb_conn, "share_init failed!");
162                 return;
163         }
164 }
165
166 static const struct stream_server_ops smb_stream_ops = {
167         .name                   = "smbsrv",
168         .accept_connection      = smbsrv_accept,
169         .recv_handler           = smbsrv_recv,
170         .send_handler           = smbsrv_send,
171 };
172
173 /*
174   setup a listening socket on all the SMB ports for a particular address
175 */
176 _PUBLIC_ NTSTATUS smbsrv_add_socket(struct event_context *event_context,
177                                     struct loadparm_context *lp_ctx,
178                                const struct model_ops *model_ops,
179                                const char *address)
180 {
181         const char **ports = lp_smb_ports(lp_ctx);
182         int i;
183         NTSTATUS status;
184
185         for (i=0;ports[i];i++) {
186                 uint16_t port = atoi(ports[i]);
187                 if (port == 0) continue;
188                 status = stream_setup_socket(event_context, lp_ctx, 
189                                              model_ops, &smb_stream_ops, 
190                                              "ipv4", address, &port, 
191                                              lp_socket_options(lp_ctx), 
192                                              NULL);
193                 NT_STATUS_NOT_OK_RETURN(status);
194         }
195
196         return NT_STATUS_OK;
197 }
198
199
200 /*
201   pre-open some of our ldb databases, to prevent an explosion of memory usage
202   when we fork
203  */
204 static void smbsrv_preopen_ldb(struct task_server *task)
205 {
206         /* yes, this looks strange. It is a hack to preload the
207            schema. I'd like to share most of the ldb context with the
208            child too. That will come later */
209         talloc_free(samdb_connect(task, task->lp_ctx, NULL));
210 }
211
212 /*
213   open the smb server sockets
214 */
215 static void smbsrv_task_init(struct task_server *task)
216 {       
217         NTSTATUS status;
218
219         task_server_set_title(task, "task[smbsrv]");
220
221         if (lp_interfaces(task->lp_ctx) && lp_bind_interfaces_only(task->lp_ctx)) {
222                 int num_interfaces;
223                 int i;
224                 struct interface *ifaces;
225
226                 load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
227
228                 num_interfaces = iface_count(ifaces);
229
230                 /* We have been given an interfaces line, and been 
231                    told to only bind to those interfaces. Create a
232                    socket per interface and bind to only these.
233                 */
234                 for(i = 0; i < num_interfaces; i++) {
235                         const char *address = iface_n_ip(ifaces, i);
236                         status = smbsrv_add_socket(task->event_ctx, task->lp_ctx, task->model_ops, address);
237                         if (!NT_STATUS_IS_OK(status)) goto failed;
238                 }
239         } else {
240                 /* Just bind to lp_socket_address() (usually 0.0.0.0) */
241                 status = smbsrv_add_socket(task->event_ctx, task->lp_ctx, task->model_ops, 
242                                            lp_socket_address(task->lp_ctx));
243                 if (!NT_STATUS_IS_OK(status)) goto failed;
244         }
245
246         smbsrv_preopen_ldb(task);
247
248         return;
249 failed:
250         task_server_terminate(task, "Failed to startup smb server task");       
251 }
252
253 /* called at smbd startup - register ourselves as a server service */
254 NTSTATUS server_service_smb_init(void)
255 {
256         return register_server_service("smb", smbsrv_task_init);
257 }