source3/smbd/globals.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    smbd globals
   4    Copyright (C) Stefan Metzmacher 2009
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "smbd/smbd.h"
  22 #include "smbd/globals.h"
  23 #include "lib/smbd_shim.h"
  24 #include "memcache.h"
  25 #include "messages.h"
  26 #include "tdb_compat.h"
  27
  28 #if defined(WITH_AIO)
  29 struct aio_extra *aio_list_head = NULL;
  30 struct tevent_signal *aio_signal_event = NULL;
  31 int aio_pending_size = 0;
  32 int outstanding_aio_calls = 0;
  33 #endif
  34
  35 #ifdef USE_DMAPI
  36 struct smbd_dmapi_context *dmapi_ctx = NULL;
  37 #endif
  38
  39
  40 bool dfree_broken = false;
  41
  42 /* how many write cache buffers have been allocated */
  43 unsigned int allocated_write_caches = 0;
  44
  45 const struct mangle_fns *mangle_fns = NULL;
  46
  47 unsigned char *chartest = NULL;
  48 TDB_CONTEXT *tdb_mangled_cache = NULL;
  49
  50 /*
  51   this determines how many characters are used from the original filename
  52   in the 8.3 mangled name. A larger value leads to a weaker hash and more collisions.
  53   The largest possible value is 6.
  54 */
  55 unsigned mangle_prefix = 0;
  56
  57 struct msg_state *smbd_msg_state = NULL;
  58
  59 bool logged_ioctl_message = false;
  60
  61 time_t last_smb_conf_reload_time = 0;
  62 time_t last_printer_reload_time = 0;
  63 /****************************************************************************
  64  structure to hold a linked list of queued messages.
  65  for processing.
  66 ****************************************************************************/
  67 struct pending_message_list *deferred_open_queue = NULL;
  68 uint32_t common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES|FLAGS2_EXTENDED_ATTRIBUTES;
  69
  70 struct smb_srv_trans_enc_ctx *partial_srv_trans_enc_ctx = NULL;
  71 struct smb_srv_trans_enc_ctx *srv_trans_enc_ctx = NULL;
  72
  73 /* A stack of security contexts.  We include the current context as being
  74    the first one, so there is room for another MAX_SEC_CTX_DEPTH more. */
  75 struct sec_ctx sec_ctx_stack[MAX_SEC_CTX_DEPTH + 1];
  76 int sec_ctx_stack_ndx = 0;
  77 bool become_uid_done = false;
  78 bool become_gid_done = false;
  79
  80 connection_struct *last_conn = NULL;
  81 uint16_t last_flags = 0;
  82
  83 uint32_t global_client_caps = 0;
  84
  85 uint16_t fnf_handle = 257;
  86
  87 /* A stack of current_user connection contexts. */
  88 struct conn_ctx conn_ctx_stack[MAX_SEC_CTX_DEPTH];
  89 int conn_ctx_stack_ndx = 0;
  90
  91 struct vfs_init_function_entry *backends = NULL;
  92 char *sparse_buf = NULL;
  93 char *LastDir = NULL;
  94
  95 /* Current number of oplocks we have outstanding. */
  96 int32_t exclusive_oplocks_open = 0;
  97 int32_t level_II_oplocks_open = 0;
  98 struct kernel_oplocks *koplocks = NULL;
  99
 100 int am_parent = 1;
 101 struct memcache *smbd_memcache_ctx = NULL;
 102 bool exit_firsttime = true;
 103 struct child_pid *children = 0;
 104 int num_children = 0;
 105
 106 struct smbd_server_connection *smbd_server_conn = NULL;
 107
 108 struct smbd_server_connection *msg_ctx_to_sconn(struct messaging_context *msg_ctx)
 109 {
 110         struct server_id my_id, msg_id;
 111
 112         my_id = messaging_server_id(smbd_server_conn->msg_ctx);
 113         msg_id = messaging_server_id(msg_ctx);
 114
 115         if (!procid_equal(&my_id, &msg_id)) {
 116                 return NULL;
 117         }
 118         return smbd_server_conn;
 119 }
 120
 121 struct messaging_context *smbd_messaging_context(void)
 122 {
 123         struct messaging_context *msg_ctx = server_messaging_context();
 124         if (likely(msg_ctx != NULL)) {
 125                 return msg_ctx;
 126         }
 127         smb_panic("Could not init smbd's messaging context.\n");
 128         return NULL;
 129 }
 130
 131 struct memcache *smbd_memcache(void)
 132 {
 133         if (!smbd_memcache_ctx) {
 134                 /*
 135                  * Note we MUST use the NULL context here, not the
 136                  * autofree context, to avoid side effects in forked
 137                  * children exiting.
 138                  */
 139                 smbd_memcache_ctx = memcache_init(NULL,
 140                                                   lp_max_stat_cache_size()*1024);
 141         }
 142         if (!smbd_memcache_ctx) {
 143                 smb_panic("Could not init smbd memcache");
 144         }
 145
 146         return smbd_memcache_ctx;
 147 }
 148
 149 static const struct smbd_shim smbd_shim_fns =
 150 {
 151         .cancel_pending_lock_requests_by_fid = smbd_cancel_pending_lock_requests_by_fid,
 152         .send_stat_cache_delete_message = smbd_send_stat_cache_delete_message,
 153         .can_delete_directory = smbd_can_delete_directory,
 154         .change_to_root_user = smbd_change_to_root_user,
 155
 156         .contend_level2_oplocks_begin = smbd_contend_level2_oplocks_begin,
 157         .contend_level2_oplocks_end = smbd_contend_level2_oplocks_end,
 158
 159         .become_root = smbd_become_root,
 160         .unbecome_root = smbd_unbecome_root
 161 };
 162
 163 void smbd_init_globals(void)
 164 {
 165         set_smbd_shim(&smbd_shim_fns);
 166
 167         ZERO_STRUCT(conn_ctx_stack);
 168
 169         ZERO_STRUCT(sec_ctx_stack);
 170
 171         smbd_server_conn = talloc_zero(server_event_context(), struct smbd_server_connection);
 172         if (!smbd_server_conn) {
 173                 exit_server("failed to create smbd_server_connection");
 174         }
 175
 176         smbd_server_conn->smb1.echo_handler.trusted_fd = -1;
 177         smbd_server_conn->smb1.echo_handler.socket_lock_fd = -1;
 178 }