1 /*
2 Unix SMB/CIFS implementation.
3 Manage connections_struct structures
4 Copyright (C) Andrew Tridgell 1998
5 Copyright (C) Alexander Bokovoy 2002
6 Copyright (C) Jeremy Allison 2010
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 "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "lib/util/bitmap.h"
26
27 /****************************************************************************
28 Return the number of open connections.
29 ****************************************************************************/
30
conn_num_open(struct smbd_server_connection * sconn)31 int conn_num_open(struct smbd_server_connection *sconn)
32 {
33 return sconn->num_connections;
34 }
35
36 /****************************************************************************
37 Check if a snum is in use.
38 ****************************************************************************/
39
conn_snum_used(struct smbd_server_connection * sconn,int snum)40 bool conn_snum_used(struct smbd_server_connection *sconn,
41 int snum)
42 {
43 struct connection_struct *conn;
44
45 for (conn=sconn->connections; conn; conn=conn->next) {
46 if (conn->params->service == snum) {
47 return true;
48 }
49 }
50
51 return false;
52 }
53
54 /****************************************************************************
55 Find first available connection slot, starting from a random position.
56 The randomisation stops problems with the server dieing and clients
57 thinking the server is still available.
58 ****************************************************************************/
59
conn_new(struct smbd_server_connection * sconn)60 connection_struct *conn_new(struct smbd_server_connection *sconn)
61 {
62 connection_struct *conn = NULL;
63
64 conn = talloc_zero(NULL, connection_struct);
65 if (conn == NULL) {
66 DBG_ERR("talloc_zero failed\n");
67 return NULL;
68 }
69 conn->params = talloc(conn, struct share_params);
70 if (conn->params == NULL) {
71 DBG_ERR("talloc_zero failed\n");
72 TALLOC_FREE(conn);
73 return NULL;
74 }
75 conn->vuid_cache = talloc_zero(conn, struct vuid_cache);
76 if (conn->vuid_cache == NULL) {
77 DBG_ERR("talloc_zero failed\n");
78 TALLOC_FREE(conn);
79 return NULL;
80 }
81 conn->connectpath = talloc_strdup(conn, "");
82 if (conn->connectpath == NULL) {
83 DBG_ERR("talloc_zero failed\n");
84 TALLOC_FREE(conn);
85 return NULL;
86 }
87 conn->origpath = talloc_strdup(conn, "");
88 if (conn->origpath == NULL) {
89 DBG_ERR("talloc_zero failed\n");
90 TALLOC_FREE(conn);
91 return NULL;
92 }
93 conn->cwd_fsp = talloc_zero(conn, struct files_struct);
94 if (conn->cwd_fsp == NULL) {
95 DBG_ERR("talloc_zero failed\n");
96 TALLOC_FREE(conn);
97 return NULL;
98 }
99 conn->cwd_fsp->fh = talloc_zero(conn->cwd_fsp, struct fd_handle);
100 if (conn->cwd_fsp->fh == NULL) {
101 DBG_ERR("talloc_zero failed\n");
102 TALLOC_FREE(conn);
103 return NULL;
104 }
105 conn->sconn = sconn;
106 conn->force_group_gid = (gid_t)-1;
107 conn->cwd_fsp->fh->fd = -1;
108 conn->cwd_fsp->fnum = FNUM_FIELD_INVALID;
109 conn->cwd_fsp->conn = conn;
110
111 DLIST_ADD(sconn->connections, conn);
112 sconn->num_connections++;
113
114 return conn;
115 }
116
117 /****************************************************************************
118 Clear a vuid out of the connection's vuid cache
119 ****************************************************************************/
120
conn_clear_vuid_cache(connection_struct * conn,uint64_t vuid)121 static void conn_clear_vuid_cache(connection_struct *conn, uint64_t vuid)
122 {
123 int i;
124
125 for (i=0; i<VUID_CACHE_SIZE; i++) {
126 struct vuid_cache_entry *ent;
127
128 ent = &conn->vuid_cache->array[i];
129
130 if (ent->vuid == vuid) {
131 ent->vuid = UID_FIELD_INVALID;
132 /*
133 * We need to keep conn->session_info around
134 * if it's equal to ent->session_info as a SMBulogoff
135 * is often followed by a SMBtdis (with an invalid
136 * vuid). The debug code (or regular code in
137 * vfs_full_audit) wants to refer to the
138 * conn->session_info pointer to print debug
139 * statements. Theoretically this is a bug,
140 * as once the vuid is gone the session_info
141 * on the conn struct isn't valid any more,
142 * but there's enough code that assumes
143 * conn->session_info is never null that
144 * it's easier to hold onto the old pointer
145 * until we get a new sessionsetupX.
146 * As everything is hung off the
147 * conn pointer as a talloc context we're not
148 * leaking memory here. See bug #6315. JRA.
149 */
150 if (conn->session_info == ent->session_info) {
151 ent->session_info = NULL;
152 } else {
153 TALLOC_FREE(ent->session_info);
154 }
155 ent->read_only = False;
156 ent->share_access = 0;
157 }
158 }
159 }
160
161 /****************************************************************************
162 Clear a vuid out of the validity cache, and as the 'owner' of a connection.
163
164 Called from invalidate_vuid()
165 ****************************************************************************/
166
conn_clear_vuid_caches(struct smbd_server_connection * sconn,uint64_t vuid)167 void conn_clear_vuid_caches(struct smbd_server_connection *sconn, uint64_t vuid)
168 {
169 connection_struct *conn;
170
171 for (conn=sconn->connections; conn;conn=conn->next) {
172 if (conn->vuid == vuid) {
173 conn->vuid = UID_FIELD_INVALID;
174 }
175 conn_clear_vuid_cache(conn, vuid);
176 }
177 }
178
179 /****************************************************************************
180 Free a conn structure - internal part.
181 ****************************************************************************/
182
conn_free_internal(connection_struct * conn)183 static void conn_free_internal(connection_struct *conn)
184 {
185 vfs_handle_struct *handle = NULL, *thandle = NULL;
186 struct trans_state *state = NULL;
187
188 /* Free vfs_connection_struct */
189 handle = conn->vfs_handles;
190 while(handle) {
191 thandle = handle->next;
192 DLIST_REMOVE(conn->vfs_handles, handle);
193 if (handle->free_data)
194 handle->free_data(&handle->data);
195 handle = thandle;
196 }
197
198 /* Free any pending transactions stored on this conn. */
199 for (state = conn->pending_trans; state; state = state->next) {
200 /* state->setup is a talloc child of state. */
201 SAFE_FREE(state->param);
202 SAFE_FREE(state->data);
203 }
204
205 free_namearray(conn->veto_list);
206 free_namearray(conn->hide_list);
207 free_namearray(conn->veto_oplock_list);
208 free_namearray(conn->aio_write_behind_list);
209
210 ZERO_STRUCTP(conn);
211 talloc_destroy(conn);
212 }
213
214 /****************************************************************************
215 Free a conn structure.
216 ****************************************************************************/
217
conn_free(connection_struct * conn)218 void conn_free(connection_struct *conn)
219 {
220 if (conn->sconn == NULL) {
221 conn_free_internal(conn);
222 return;
223 }
224
225 DLIST_REMOVE(conn->sconn->connections, conn);
226 SMB_ASSERT(conn->sconn->num_connections > 0);
227 conn->sconn->num_connections--;
228
229 conn_free_internal(conn);
230 }
231
232 /*
233 * Correctly initialize a share with case options.
234 */
conn_setup_case_options(connection_struct * conn)235 void conn_setup_case_options(connection_struct *conn)
236 {
237 int snum = conn->params->service;
238
239 if (lp_case_sensitive(snum) == Auto) {
240 /* We will be setting this per packet. Set to be case
241 * insensitive for now. */
242 conn->case_sensitive = false;
243 } else {
244 conn->case_sensitive = (bool)lp_case_sensitive(snum);
245 }
246
247 conn->case_preserve = lp_preserve_case(snum);
248 conn->short_case_preserve = lp_short_preserve_case(snum);
249 }
250