import HEAD into svn+ssh://svn.samba.org/home/svn/samba/trunk
[metze/old/v3-2-winbind-ndr.git] / source / smbd / conn.c
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 2 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, write to the Free Software
19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include "includes.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 static connection_struct *Connections;
31
32 /* number of open connections */
33 static struct bitmap *bmap;
34 static int num_open;
35
36 /****************************************************************************
37 init the conn structures
38 ****************************************************************************/
39 void conn_init(void)
40 {
41         bmap = bitmap_allocate(BITMAP_BLOCK_SZ);
42 }
43
44 /****************************************************************************
45 return the number of open connections
46 ****************************************************************************/
47 int conn_num_open(void)
48 {
49         return num_open;
50 }
51
52
53 /****************************************************************************
54 check if a snum is in use
55 ****************************************************************************/
56 BOOL conn_snum_used(int snum)
57 {
58         connection_struct *conn;
59         for (conn=Connections;conn;conn=conn->next) {
60                 if (conn->service == snum) {
61                         return(True);
62                 }
63         }
64         return(False);
65 }
66
67
68 /****************************************************************************
69 find a conn given a cnum
70 ****************************************************************************/
71 connection_struct *conn_find(unsigned cnum)
72 {
73         int count=0;
74         connection_struct *conn;
75
76         for (conn=Connections;conn;conn=conn->next,count++) {
77                 if (conn->cnum == cnum) {
78                         if (count > 10) {
79                                 DLIST_PROMOTE(Connections, conn);
80                         }
81                         return conn;
82                 }
83         }
84
85         return NULL;
86 }
87
88
89 /****************************************************************************
90   find first available connection slot, starting from a random position.
91 The randomisation stops problems with the server dieing and clients
92 thinking the server is still available.
93 ****************************************************************************/
94 connection_struct *conn_new(void)
95 {
96         TALLOC_CTX *mem_ctx;
97         connection_struct *conn;
98         int i;
99         int find_offset = 1;
100
101 find_again:
102         i = bitmap_find(bmap, find_offset);
103         
104         if (i == -1) {
105                 /* Expand the connections bitmap. */
106                 int             oldsz = bmap->n;
107                 int             newsz = bmap->n + BITMAP_BLOCK_SZ;
108                 struct bitmap * nbmap;
109
110                 if (newsz <= 0) {
111                         /* Integer wrap. */
112                         DEBUG(0,("ERROR! Out of connection structures\n"));
113                         return NULL;
114                 }
115
116                 DEBUG(4,("resizing connections bitmap from %d to %d\n",
117                         oldsz, newsz));
118
119                 nbmap = bitmap_allocate(newsz);
120
121                 bitmap_copy(nbmap, bmap);
122                 bitmap_free(bmap);
123
124                 bmap = nbmap;
125                 find_offset = oldsz; /* Start next search in the new portion. */
126
127                 goto find_again;
128         }
129
130         if ((mem_ctx=talloc_init("connection_struct"))==NULL) {
131                 DEBUG(0,("talloc_init(connection_struct) failed!\n"));
132                 return NULL;
133         }
134
135         if ((conn=(connection_struct *)talloc_zero(mem_ctx, sizeof(*conn)))==NULL) {
136                 DEBUG(0,("talloc_zero() failed!\n"));
137                 return NULL;
138         }
139         conn->mem_ctx = mem_ctx;
140         conn->cnum = i;
141
142         bitmap_set(bmap, i);
143
144         num_open++;
145
146         string_set(&conn->user,"");
147         string_set(&conn->dirpath,"");
148         string_set(&conn->connectpath,"");
149         string_set(&conn->origpath,"");
150         
151         DLIST_ADD(Connections, conn);
152
153         return conn;
154 }
155
156 /****************************************************************************
157 close all conn structures
158 ****************************************************************************/
159 void conn_close_all(void)
160 {
161         connection_struct *conn, *next;
162         for (conn=Connections;conn;conn=next) {
163                 next=conn->next;
164                 close_cnum(conn, conn->vuid);
165         }
166 }
167
168 /****************************************************************************
169  Idle inactive connections.
170 ****************************************************************************/
171
172 BOOL conn_idle_all(time_t t, int deadtime)
173 {
174         pipes_struct *plist = NULL;
175         BOOL allidle = True;
176         connection_struct *conn, *next;
177
178         for (conn=Connections;conn;conn=next) {
179                 next=conn->next;
180                 /* close dirptrs on connections that are idle */
181                 if ((t-conn->lastused) > DPTR_IDLE_TIMEOUT)
182                         dptr_idlecnum(conn);
183
184                 if (conn->num_files_open > 0 || 
185                     (t-conn->lastused)<deadtime)
186                         allidle = False;
187         }
188
189         /*
190          * Check all pipes for any open handles. We cannot
191          * idle with a handle open.
192          */
193
194         for (plist = get_first_internal_pipe(); plist; plist = get_next_internal_pipe(plist))
195                 if (plist->pipe_handles && plist->pipe_handles->count)
196                         allidle = False;
197         
198         return allidle;
199 }
200
201 /****************************************************************************
202  Clear a vuid out of the validity cache, and as the 'owner' of a connection.
203 ****************************************************************************/
204
205 void conn_clear_vuid_cache(uint16 vuid)
206 {
207         connection_struct *conn;
208         unsigned int i;
209
210         for (conn=Connections;conn;conn=conn->next) {
211                 if (conn->vuid == vuid) {
212                         conn->vuid = UID_FIELD_INVALID;
213                 }
214
215                 for (i=0;i<conn->vuid_cache.entries && i< VUID_CACHE_SIZE;i++) {
216                         if (conn->vuid_cache.array[i].vuid == vuid) {
217                                 struct vuid_cache_entry *ent = &conn->vuid_cache.array[i];
218                                 ent->vuid = UID_FIELD_INVALID;
219                                 ent->read_only = False;
220                                 ent->admin_user = False;
221                         }
222                 }
223         }
224 }
225
226 /****************************************************************************
227  Free a conn structure.
228 ****************************************************************************/
229
230 void conn_free(connection_struct *conn)
231 {
232         vfs_handle_struct *handle = NULL, *thandle = NULL;
233         TALLOC_CTX *mem_ctx = NULL;
234
235         /* Free vfs_connection_struct */
236         handle = conn->vfs_handles;
237         while(handle) {
238                 DLIST_REMOVE(conn->vfs_handles, handle);
239                 thandle = handle->next;
240                 if (handle->free_data)
241                         handle->free_data(&handle->data);
242                 handle = thandle;
243         }
244
245         DLIST_REMOVE(Connections, conn);
246
247         if (conn->ngroups && conn->groups) {
248                 SAFE_FREE(conn->groups);
249                 conn->ngroups = 0;
250         }
251
252         if (conn->nt_user_token) {
253                 delete_nt_token(&(conn->nt_user_token));
254         }
255
256         if (conn->privs) {
257                 destroy_privilege(&(conn->privs));
258         }
259
260         free_namearray(conn->veto_list);
261         free_namearray(conn->hide_list);
262         free_namearray(conn->veto_oplock_list);
263         
264         string_free(&conn->user);
265         string_free(&conn->dirpath);
266         string_free(&conn->connectpath);
267         string_free(&conn->origpath);
268
269         bitmap_clear(bmap, conn->cnum);
270         num_open--;
271
272         mem_ctx = conn->mem_ctx;
273         ZERO_STRUCTP(conn);
274         talloc_destroy(mem_ctx);
275 }
276
277
278 /****************************************************************************
279 receive a smbcontrol message to forcibly unmount a share
280 the message contains just a share name and all instances of that
281 share are unmounted
282 the special sharename '*' forces unmount of all shares
283 ****************************************************************************/
284 void msg_force_tdis(int msg_type, pid_t pid, void *buf, size_t len)
285 {
286         connection_struct *conn, *next;
287         fstring sharename;
288
289         fstrcpy(sharename, buf);
290
291         if (strcmp(sharename, "*") == 0) {
292                 DEBUG(1,("Forcing close of all shares\n"));
293                 conn_close_all();
294                 return;
295         }
296
297         for (conn=Connections;conn;conn=next) {
298                 next=conn->next;
299                 if (strequal(lp_servicename(conn->service), sharename)) {
300                         DEBUG(1,("Forcing close of share %s cnum=%d\n",
301                                  sharename, conn->cnum));
302                         close_cnum(conn, (uint16)-1);
303                 }
304         }
305 }