mirror of
https://github.com/samba-team/samba.git
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40f5eab5eb
No functional change, this is a preparation for more current_user ref removal
(This used to be commit dcaedf345e
)
333 lines
8.5 KiB
C
333 lines
8.5 KiB
C
/*
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Unix SMB/CIFS implementation.
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connection claim routines
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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/****************************************************************************
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Delete a connection record.
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****************************************************************************/
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bool yield_connection(connection_struct *conn, const char *name)
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{
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struct db_record *rec;
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NTSTATUS status;
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DEBUG(3,("Yielding connection to %s\n",name));
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if (!(rec = connections_fetch_entry(NULL, conn, name))) {
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DEBUG(0, ("connections_fetch_entry failed\n"));
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return False;
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}
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status = rec->delete_rec(rec);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG( NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND) ? 3 : 0,
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("deleting connection record returned %s\n",
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nt_errstr(status)));
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}
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TALLOC_FREE(rec);
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return NT_STATUS_IS_OK(status);
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}
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struct count_stat {
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pid_t mypid;
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int curr_connections;
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const char *name;
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bool Clear;
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};
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/****************************************************************************
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Count the entries belonging to a service in the connection db.
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****************************************************************************/
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static int count_fn(struct db_record *rec,
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const struct connections_key *ckey,
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const struct connections_data *crec,
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void *udp)
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{
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struct count_stat *cs = (struct count_stat *)udp;
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if (crec->cnum == -1) {
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return 0;
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}
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/* If the pid was not found delete the entry from connections.tdb */
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if (cs->Clear && !process_exists(crec->pid) && (errno == ESRCH)) {
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NTSTATUS status;
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DEBUG(2,("pid %s doesn't exist - deleting connections %d [%s]\n",
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procid_str_static(&crec->pid), crec->cnum,
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crec->servicename));
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status = rec->delete_rec(rec);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0,("count_fn: tdb_delete failed with error %s\n",
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nt_errstr(status)));
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}
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return 0;
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}
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if (strequal(crec->servicename, cs->name))
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cs->curr_connections++;
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return 0;
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}
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/****************************************************************************
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Claim an entry in the connections database.
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****************************************************************************/
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int count_current_connections( const char *sharename, bool clear )
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{
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struct count_stat cs;
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cs.mypid = sys_getpid();
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cs.curr_connections = 0;
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cs.name = sharename;
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cs.Clear = clear;
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/*
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* This has a race condition, but locking the chain before hand is worse
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* as it leads to deadlock.
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*/
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if (connections_forall(count_fn, &cs) == -1) {
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DEBUG(0,("count_current_connections: traverse of "
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"connections.tdb failed\n"));
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return False;
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}
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return cs.curr_connections;
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}
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/****************************************************************************
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Count the number of connections open across all shares.
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****************************************************************************/
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int count_all_current_connections(void)
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{
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return count_current_connections(NULL, True /* clear stale entries */);
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}
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/****************************************************************************
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Claim an entry in the connections database.
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****************************************************************************/
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bool claim_connection(connection_struct *conn, const char *name,
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uint32 msg_flags)
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{
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struct db_record *rec;
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struct connections_data crec;
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TDB_DATA dbuf;
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NTSTATUS status;
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char addr[INET6_ADDRSTRLEN];
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DEBUG(5,("claiming [%s]\n", name));
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if (!(rec = connections_fetch_entry(talloc_tos(), conn, name))) {
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DEBUG(0, ("connections_fetch_entry failed\n"));
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return False;
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}
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/* fill in the crec */
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ZERO_STRUCT(crec);
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crec.magic = 0x280267;
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crec.pid = procid_self();
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crec.cnum = conn?conn->cnum:-1;
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if (conn) {
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crec.uid = conn->server_info->utok.uid;
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crec.gid = conn->server_info->utok.gid;
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strlcpy(crec.servicename, lp_servicename(SNUM(conn)),
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sizeof(crec.servicename));
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}
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crec.start = time(NULL);
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crec.bcast_msg_flags = msg_flags;
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strlcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine));
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strlcpy(crec.addr,conn?conn->client_address:
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client_addr(get_client_fd(),addr,sizeof(addr)),
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sizeof(crec.addr));
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dbuf.dptr = (uint8 *)&crec;
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dbuf.dsize = sizeof(crec);
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status = rec->store(rec, dbuf, TDB_REPLACE);
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TALLOC_FREE(rec);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
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nt_errstr(status)));
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return False;
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}
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return True;
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}
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bool register_message_flags(bool doreg, uint32 msg_flags)
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{
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struct db_record *rec;
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struct connections_data *pcrec;
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NTSTATUS status;
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DEBUG(10,("register_message_flags: %s flags 0x%x\n",
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doreg ? "adding" : "removing",
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(unsigned int)msg_flags ));
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if (!(rec = connections_fetch_entry(NULL, NULL, ""))) {
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DEBUG(0, ("connections_fetch_entry failed\n"));
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return False;
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}
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if (rec->value.dsize != sizeof(struct connections_data)) {
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DEBUG(0,("register_message_flags: Got wrong record size\n"));
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TALLOC_FREE(rec);
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return False;
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}
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pcrec = (struct connections_data *)rec->value.dptr;
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if (doreg)
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pcrec->bcast_msg_flags |= msg_flags;
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else
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pcrec->bcast_msg_flags &= ~msg_flags;
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status = rec->store(rec, rec->value, TDB_REPLACE);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0,("register_message_flags: tdb_store failed: %s.\n",
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nt_errstr(status)));
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TALLOC_FREE(rec);
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return False;
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}
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DEBUG(10,("register_message_flags: new flags 0x%x\n",
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(unsigned int)pcrec->bcast_msg_flags ));
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TALLOC_FREE(rec);
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return True;
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}
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/*********************************************************************
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*********************************************************************/
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static TDB_DATA* make_pipe_rec_key( struct pipe_open_rec *prec )
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{
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TDB_DATA *kbuf = NULL;
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fstring key_string;
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if ( !prec )
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return NULL;
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if ( (kbuf = TALLOC_P(prec, TDB_DATA)) == NULL ) {
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return NULL;
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}
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snprintf( key_string, sizeof(key_string), "%s/%d/%d",
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prec->name, procid_to_pid(&prec->pid), prec->pnum );
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*kbuf = string_term_tdb_data(talloc_strdup(prec, key_string));
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if (kbuf->dptr == NULL )
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return NULL;
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return kbuf;
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}
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/*********************************************************************
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*********************************************************************/
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static void fill_pipe_open_rec( struct pipe_open_rec *prec, smb_np_struct *p )
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{
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prec->pid = pid_to_procid(sys_getpid());
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prec->pnum = p->pnum;
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prec->uid = geteuid();
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fstrcpy( prec->name, p->name );
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return;
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}
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/*********************************************************************
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*********************************************************************/
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bool store_pipe_opendb( smb_np_struct *p )
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{
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struct db_record *dbrec;
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struct pipe_open_rec *prec;
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TDB_DATA *key;
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TDB_DATA data;
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bool ret = False;
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if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
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DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
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return False;
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}
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fill_pipe_open_rec( prec, p );
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if ( (key = make_pipe_rec_key( prec )) == NULL ) {
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goto done;
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}
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data.dptr = (uint8 *)prec;
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data.dsize = sizeof(struct pipe_open_rec);
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if (!(dbrec = connections_fetch_record(prec, *key))) {
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DEBUG(0, ("connections_fetch_record failed\n"));
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goto done;
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}
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ret = NT_STATUS_IS_OK(dbrec->store(dbrec, data, TDB_REPLACE));
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done:
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TALLOC_FREE( prec );
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return ret;
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}
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/*********************************************************************
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*********************************************************************/
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bool delete_pipe_opendb( smb_np_struct *p )
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{
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struct db_record *dbrec;
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struct pipe_open_rec *prec;
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TDB_DATA *key;
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bool ret = False;
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if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
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DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
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return False;
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}
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fill_pipe_open_rec( prec, p );
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if ( (key = make_pipe_rec_key( prec )) == NULL ) {
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goto done;
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}
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if (!(dbrec = connections_fetch_record(prec, *key))) {
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DEBUG(0, ("connections_fetch_record failed\n"));
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goto done;
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}
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ret = NT_STATUS_IS_OK(dbrec->delete_rec(dbrec));
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done:
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TALLOC_FREE( prec );
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return ret;
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}
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