/* Unix SMB/CIFS implementation. Manage connections_struct structures Copyright (C) Andrew Tridgell 1998 Copyright (C) Alexander Bokovoy 2002 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" /* The connections bitmap is expanded in increments of BITMAP_BLOCK_SZ. The * maximum size of the bitmap is the largest positive integer, but you will hit * the "max connections" limit, looong before that. */ #define BITMAP_BLOCK_SZ 128 static connection_struct *Connections; /* number of open connections */ static struct bitmap *bmap; static int num_open; /**************************************************************************** init the conn structures ****************************************************************************/ void conn_init(void) { bmap = bitmap_allocate(BITMAP_BLOCK_SZ); } /**************************************************************************** return the number of open connections ****************************************************************************/ int conn_num_open(void) { return num_open; } /**************************************************************************** check if a snum is in use ****************************************************************************/ bool conn_snum_used(int snum) { connection_struct *conn; for (conn=Connections;conn;conn=conn->next) { if (conn->params->service == snum) { return(True); } } return(False); } /**************************************************************************** Find a conn given a cnum. ****************************************************************************/ connection_struct *conn_find(unsigned cnum) { int count=0; connection_struct *conn; for (conn=Connections;conn;conn=conn->next,count++) { if (conn->cnum == cnum) { if (count > 10) { DLIST_PROMOTE(Connections, conn); } return conn; } } return NULL; } /**************************************************************************** find first available connection slot, starting from a random position. The randomisation stops problems with the server dieing and clients thinking the server is still available. ****************************************************************************/ connection_struct *conn_new(void) { connection_struct *conn; int i; int find_offset = 1; find_again: i = bitmap_find(bmap, find_offset); if (i == -1) { /* Expand the connections bitmap. */ int oldsz = bmap->n; int newsz = bmap->n + BITMAP_BLOCK_SZ; struct bitmap * nbmap; if (newsz <= oldsz) { /* Integer wrap. */ DEBUG(0,("ERROR! Out of connection structures\n")); return NULL; } DEBUG(4,("resizing connections bitmap from %d to %d\n", oldsz, newsz)); nbmap = bitmap_allocate(newsz); if (!nbmap) { DEBUG(0,("ERROR! malloc fail.\n")); return NULL; } bitmap_copy(nbmap, bmap); bitmap_free(bmap); bmap = nbmap; find_offset = oldsz; /* Start next search in the new portion. */ goto find_again; } /* The bitmap position is used below as the connection number * conn->cnum). This ends up as the TID field in the SMB header, * which is limited to 16 bits (we skip 0xffff which is the * NULL TID). */ if (i > 65534) { DEBUG(0, ("Maximum connection limit reached\n")); return NULL; } if (!(conn=TALLOC_ZERO_P(NULL, connection_struct)) || !(conn->params = TALLOC_P(conn, struct share_params))) { DEBUG(0,("TALLOC_ZERO() failed!\n")); TALLOC_FREE(conn); return NULL; } conn->cnum = i; bitmap_set(bmap, i); num_open++; string_set(&conn->dirpath,""); string_set(&conn->connectpath,""); string_set(&conn->origpath,""); DLIST_ADD(Connections, conn); return conn; } /**************************************************************************** Close all conn structures. ****************************************************************************/ void conn_close_all(void) { connection_struct *conn, *next; for (conn=Connections;conn;conn=next) { next=conn->next; set_current_service(conn, 0, True); close_cnum(conn, conn->vuid); } } /**************************************************************************** Idle inactive connections. ****************************************************************************/ bool conn_idle_all(time_t t) { int deadtime = lp_deadtime()*60; pipes_struct *plist = NULL; connection_struct *conn; if (deadtime <= 0) deadtime = DEFAULT_SMBD_TIMEOUT; for (conn=Connections;conn;conn=conn->next) { time_t age = t - conn->lastused; /* Update if connection wasn't idle. */ if (conn->lastused != conn->lastused_count) { conn->lastused = t; conn->lastused_count = t; } /* close dirptrs on connections that are idle */ if (age > DPTR_IDLE_TIMEOUT) { dptr_idlecnum(conn); } if (conn->num_files_open > 0 || age < deadtime) { return False; } } /* * Check all pipes for any open handles. We cannot * idle with a handle open. */ for (plist = get_first_internal_pipe(); plist; plist = get_next_internal_pipe(plist)) { if (plist->pipe_handles && plist->pipe_handles->count) { return False; } } return True; } /**************************************************************************** Clear a vuid out of the validity cache, and as the 'owner' of a connection. ****************************************************************************/ void conn_clear_vuid_caches(uint16_t vuid) { connection_struct *conn; for (conn=Connections;conn;conn=conn->next) { if (conn->vuid == vuid) { conn->vuid = UID_FIELD_INVALID; } conn_clear_vuid_cache(conn, vuid); } } /**************************************************************************** Free a conn structure - internal part. ****************************************************************************/ void conn_free_internal(connection_struct *conn) { vfs_handle_struct *handle = NULL, *thandle = NULL; struct trans_state *state = NULL; /* Free vfs_connection_struct */ handle = conn->vfs_handles; while(handle) { DLIST_REMOVE(conn->vfs_handles, handle); thandle = handle->next; if (handle->free_data) handle->free_data(&handle->data); handle = thandle; } /* Free any pending transactions stored on this conn. */ for (state = conn->pending_trans; state; state = state->next) { /* state->setup is a talloc child of state. */ SAFE_FREE(state->param); SAFE_FREE(state->data); } free_namearray(conn->veto_list); free_namearray(conn->hide_list); free_namearray(conn->veto_oplock_list); free_namearray(conn->aio_write_behind_list); string_free(&conn->dirpath); string_free(&conn->connectpath); string_free(&conn->origpath); ZERO_STRUCTP(conn); talloc_destroy(conn); } /**************************************************************************** Free a conn structure. ****************************************************************************/ void conn_free(connection_struct *conn) { DLIST_REMOVE(Connections, conn); bitmap_clear(bmap, conn->cnum); SMB_ASSERT(num_open > 0); num_open--; conn_free_internal(conn); } /**************************************************************************** receive a smbcontrol message to forcibly unmount a share the message contains just a share name and all instances of that share are unmounted the special sharename '*' forces unmount of all shares ****************************************************************************/ void msg_force_tdis(struct messaging_context *msg, void *private_data, uint32_t msg_type, struct server_id server_id, DATA_BLOB *data) { connection_struct *conn, *next; fstring sharename; fstrcpy(sharename, (const char *)data->data); if (strcmp(sharename, "*") == 0) { DEBUG(1,("Forcing close of all shares\n")); conn_close_all(); return; } for (conn=Connections;conn;conn=next) { next=conn->next; if (strequal(lp_servicename(SNUM(conn)), sharename)) { DEBUG(1,("Forcing close of share %s cnum=%d\n", sharename, conn->cnum)); close_cnum(conn, (uint16)-1); } } }