source: vendor/3.5.0/source3/smbd/conn.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 10.0 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Manage connections_struct structures
4 Copyright (C) Andrew Tridgell 1998
5 Copyright (C) Alexander Bokovoy 2002
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/globals.h"
23
24/* The connections bitmap is expanded in increments of BITMAP_BLOCK_SZ. The
25 * maximum size of the bitmap is the largest positive integer, but you will hit
26 * the "max connections" limit, looong before that.
27 */
28#define BITMAP_BLOCK_SZ 128
29
30/****************************************************************************
31init the conn structures
32****************************************************************************/
33void conn_init(struct smbd_server_connection *sconn)
34{
35 sconn->smb1.tcons.Connections = NULL;
36 sconn->smb1.tcons.num_open = 0;
37 sconn->smb1.tcons.bmap = bitmap_allocate(BITMAP_BLOCK_SZ);
38}
39
40/****************************************************************************
41return the number of open connections
42****************************************************************************/
43int conn_num_open(struct smbd_server_connection *sconn)
44{
45 return sconn->smb1.tcons.num_open;
46}
47
48
49/****************************************************************************
50check if a snum is in use
51****************************************************************************/
52bool conn_snum_used(int snum)
53{
54 struct smbd_server_connection *sconn = smbd_server_conn;
55 connection_struct *conn;
56 for (conn=sconn->smb1.tcons.Connections;conn;conn=conn->next) {
57 if (conn->params->service == snum) {
58 return(True);
59 }
60 }
61 return(False);
62}
63
64/****************************************************************************
65 Find a conn given a cnum.
66****************************************************************************/
67
68connection_struct *conn_find(struct smbd_server_connection *sconn,unsigned cnum)
69{
70 int count=0;
71 connection_struct *conn;
72
73 for (conn=sconn->smb1.tcons.Connections;conn;conn=conn->next,count++) {
74 if (conn->cnum == cnum) {
75 if (count > 10) {
76 DLIST_PROMOTE(sconn->smb1.tcons.Connections,
77 conn);
78 }
79 return conn;
80 }
81 }
82
83 return NULL;
84}
85
86/****************************************************************************
87 find first available connection slot, starting from a random position.
88The randomisation stops problems with the server dieing and clients
89thinking the server is still available.
90****************************************************************************/
91connection_struct *conn_new(struct smbd_server_connection *sconn)
92{
93 connection_struct *conn;
94 int i;
95 int find_offset = 1;
96
97 if (sconn->allow_smb2) {
98 if (!(conn=TALLOC_ZERO_P(NULL, connection_struct)) ||
99 !(conn->params = TALLOC_P(conn, struct share_params))) {
100 DEBUG(0,("TALLOC_ZERO() failed!\n"));
101 TALLOC_FREE(conn);
102 return NULL;
103 }
104 conn->sconn = sconn;
105 return conn;
106 }
107
108find_again:
109 i = bitmap_find(sconn->smb1.tcons.bmap, find_offset);
110
111 if (i == -1) {
112 /* Expand the connections bitmap. */
113 int oldsz = sconn->smb1.tcons.bmap->n;
114 int newsz = sconn->smb1.tcons.bmap->n +
115 BITMAP_BLOCK_SZ;
116 struct bitmap * nbmap;
117
118 if (newsz <= oldsz) {
119 /* Integer wrap. */
120 DEBUG(0,("ERROR! Out of connection structures\n"));
121 return NULL;
122 }
123
124 DEBUG(4,("resizing connections bitmap from %d to %d\n",
125 oldsz, newsz));
126
127 nbmap = bitmap_allocate(newsz);
128 if (!nbmap) {
129 DEBUG(0,("ERROR! malloc fail.\n"));
130 return NULL;
131 }
132
133 bitmap_copy(nbmap, sconn->smb1.tcons.bmap);
134 bitmap_free(sconn->smb1.tcons.bmap);
135
136 sconn->smb1.tcons.bmap = nbmap;
137 find_offset = oldsz; /* Start next search in the new portion. */
138
139 goto find_again;
140 }
141
142 /* The bitmap position is used below as the connection number
143 * conn->cnum). This ends up as the TID field in the SMB header,
144 * which is limited to 16 bits (we skip 0xffff which is the
145 * NULL TID).
146 */
147 if (i > 65534) {
148 DEBUG(0, ("Maximum connection limit reached\n"));
149 return NULL;
150 }
151
152 if (!(conn=TALLOC_ZERO_P(NULL, connection_struct)) ||
153 !(conn->params = TALLOC_P(conn, struct share_params))) {
154 DEBUG(0,("TALLOC_ZERO() failed!\n"));
155 TALLOC_FREE(conn);
156 return NULL;
157 }
158 conn->sconn = sconn;
159 conn->cnum = i;
160 conn->force_group_gid = (gid_t)-1;
161
162 bitmap_set(sconn->smb1.tcons.bmap, i);
163
164 sconn->smb1.tcons.num_open++;
165
166 string_set(&conn->connectpath,"");
167 string_set(&conn->origpath,"");
168
169 DLIST_ADD(sconn->smb1.tcons.Connections, conn);
170
171 return conn;
172}
173
174/****************************************************************************
175 Close all conn structures.
176return true if any were closed
177****************************************************************************/
178bool conn_close_all(struct smbd_server_connection *sconn)
179{
180 connection_struct *conn, *next;
181 bool ret = false;
182 for (conn=sconn->smb1.tcons.Connections;conn;conn=next) {
183 next=conn->next;
184 set_current_service(conn, 0, True);
185 close_cnum(conn, conn->vuid);
186 ret = true;
187 }
188 return ret;
189}
190
191/****************************************************************************
192 Idle inactive connections.
193****************************************************************************/
194
195bool conn_idle_all(struct smbd_server_connection *sconn,time_t t)
196{
197 int deadtime = lp_deadtime()*60;
198 pipes_struct *plist = NULL;
199 connection_struct *conn;
200
201 if (deadtime <= 0)
202 deadtime = DEFAULT_SMBD_TIMEOUT;
203
204 for (conn=sconn->smb1.tcons.Connections;conn;conn=conn->next) {
205
206 time_t age = t - conn->lastused;
207
208 /* Update if connection wasn't idle. */
209 if (conn->lastused != conn->lastused_count) {
210 conn->lastused = t;
211 conn->lastused_count = t;
212 }
213
214 /* close dirptrs on connections that are idle */
215 if (age > DPTR_IDLE_TIMEOUT) {
216 dptr_idlecnum(conn);
217 }
218
219 if (conn->num_files_open > 0 || age < deadtime) {
220 return False;
221 }
222 }
223
224 /*
225 * Check all pipes for any open handles. We cannot
226 * idle with a handle open.
227 */
228
229 for (plist = get_first_internal_pipe(); plist;
230 plist = get_next_internal_pipe(plist)) {
231 if (num_pipe_handles(plist->pipe_handles) != 0) {
232 return False;
233 }
234 }
235
236 return True;
237}
238
239/****************************************************************************
240 Clear a vuid out of the validity cache, and as the 'owner' of a connection.
241****************************************************************************/
242
243void conn_clear_vuid_caches(struct smbd_server_connection *sconn,uint16_t vuid)
244{
245 connection_struct *conn;
246
247 for (conn=sconn->smb1.tcons.Connections;conn;conn=conn->next) {
248 if (conn->vuid == vuid) {
249 conn->vuid = UID_FIELD_INVALID;
250 }
251 conn_clear_vuid_cache(conn, vuid);
252 }
253}
254
255/****************************************************************************
256 Free a conn structure - internal part.
257****************************************************************************/
258
259static void conn_free_internal(connection_struct *conn)
260{
261 vfs_handle_struct *handle = NULL, *thandle = NULL;
262 struct trans_state *state = NULL;
263
264 /* Free vfs_connection_struct */
265 handle = conn->vfs_handles;
266 while(handle) {
267 thandle = handle->next;
268 DLIST_REMOVE(conn->vfs_handles, handle);
269 if (handle->free_data)
270 handle->free_data(&handle->data);
271 handle = thandle;
272 }
273
274 /* Free any pending transactions stored on this conn. */
275 for (state = conn->pending_trans; state; state = state->next) {
276 /* state->setup is a talloc child of state. */
277 SAFE_FREE(state->param);
278 SAFE_FREE(state->data);
279 }
280
281 free_namearray(conn->veto_list);
282 free_namearray(conn->hide_list);
283 free_namearray(conn->veto_oplock_list);
284 free_namearray(conn->aio_write_behind_list);
285
286 string_free(&conn->connectpath);
287 string_free(&conn->origpath);
288
289 ZERO_STRUCTP(conn);
290 talloc_destroy(conn);
291}
292
293/****************************************************************************
294 Free a conn structure.
295****************************************************************************/
296
297void conn_free(connection_struct *conn)
298{
299 if (conn->sconn == NULL) {
300 conn_free_internal(conn);
301 return;
302 }
303
304 if (conn->sconn->allow_smb2) {
305 conn_free_internal(conn);
306 return;
307 }
308
309 DLIST_REMOVE(conn->sconn->smb1.tcons.Connections, conn);
310
311 bitmap_clear(conn->sconn->smb1.tcons.bmap, conn->cnum);
312
313 SMB_ASSERT(conn->sconn->smb1.tcons.num_open > 0);
314 conn->sconn->smb1.tcons.num_open--;
315
316 conn_free_internal(conn);
317}
318
319/****************************************************************************
320receive a smbcontrol message to forcibly unmount a share
321the message contains just a share name and all instances of that
322share are unmounted
323the special sharename '*' forces unmount of all shares
324****************************************************************************/
325void msg_force_tdis(struct messaging_context *msg,
326 void *private_data,
327 uint32_t msg_type,
328 struct server_id server_id,
329 DATA_BLOB *data)
330{
331 struct smbd_server_connection *sconn = smbd_server_conn;
332 connection_struct *conn, *next;
333 fstring sharename;
334
335 fstrcpy(sharename, (const char *)data->data);
336
337 if (strcmp(sharename, "*") == 0) {
338 DEBUG(1,("Forcing close of all shares\n"));
339 conn_close_all(sconn);
340 return;
341 }
342
343 for (conn=sconn->smb1.tcons.Connections;conn;conn=next) {
344 next=conn->next;
345 if (strequal(lp_servicename(SNUM(conn)), sharename)) {
346 DEBUG(1,("Forcing close of share %s cnum=%d\n",
347 sharename, conn->cnum));
348 close_cnum(conn, (uint16)-1);
349 }
350 }
351}
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