/*
- Unix SMB/Netbios implementation.
- Version 1.9.
+ Unix SMB/CIFS implementation.
connection claim routines
Copyright (C) Andrew Tridgell 1998
#include "includes.h"
+static TDB_CONTEXT *tdb;
-extern fstring remote_machine;
+/****************************************************************************
+ Return the connection tdb context (used for message send all).
+****************************************************************************/
+
+TDB_CONTEXT *conn_tdb_ctx(void)
+{
+ if (!tdb)
+ tdb = tdb_open_log(lock_path("connections.tdb"), 0, TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
+ O_RDWR | O_CREAT, 0644);
-extern int DEBUGLEVEL;
+ return tdb;
+}
+
+static void make_conn_key(connection_struct *conn, const char *name, TDB_DATA *pkbuf, struct connections_key *pkey)
+{
+ ZERO_STRUCTP(pkey);
+ pkey->pid = procid_self();
+ pkey->cnum = conn?conn->cnum:-1;
+ fstrcpy(pkey->name, name);
+#ifdef DEVELOPER
+ /* valgrind fixer... */
+ {
+ size_t sl = strlen(pkey->name);
+ if (sizeof(fstring)-sl)
+ memset(&pkey->name[sl], '\0', sizeof(fstring)-sl);
+ }
+#endif
+
+ pkbuf->dptr = (char *)pkey;
+ pkbuf->dsize = sizeof(*pkey);
+}
/****************************************************************************
-simple routines to do connection counting
+ Delete a connection record.
****************************************************************************/
-BOOL yield_connection(connection_struct *conn,char *name,int max_connections)
+
+BOOL yield_connection(connection_struct *conn, const char *name)
{
- struct connect_record crec;
- pstring fname;
- int fd;
- pid_t mypid = getpid();
- int i;
+ struct connections_key key;
+ TDB_DATA kbuf;
+
+ if (!tdb)
+ return False;
DEBUG(3,("Yielding connection to %s\n",name));
- if (max_connections <= 0)
- return(True);
+ make_conn_key(conn, name, &kbuf, &key);
- memset((char *)&crec,'\0',sizeof(crec));
+ if (tdb_delete(tdb, kbuf) != 0) {
+ int dbg_lvl = (!conn && (tdb_error(tdb) == TDB_ERR_NOEXIST)) ? 3 : 0;
+ DEBUG(dbg_lvl,("yield_connection: tdb_delete for name %s failed with error %s.\n",
+ name, tdb_errorstr(tdb) ));
+ return (False);
+ }
- pstrcpy(fname,lp_lockdir());
- trim_string(fname,"","/");
+ return(True);
+}
+
+struct count_stat {
+ pid_t mypid;
+ int curr_connections;
+ const char *name;
+ BOOL Clear;
+};
+
+/****************************************************************************
+ Count the entries belonging to a service in the connection db.
+****************************************************************************/
+
+static int count_fn( TDB_CONTEXT *the_tdb, TDB_DATA kbuf, TDB_DATA dbuf, void *udp)
+{
+ struct connections_data crec;
+ struct count_stat *cs = (struct count_stat *)udp;
+
+ if (dbuf.dsize != sizeof(crec))
+ return 0;
- pstrcat(fname,"/");
- pstrcat(fname,name);
- pstrcat(fname,".LCK");
+ memcpy(&crec, dbuf.dptr, sizeof(crec));
+
+ if (crec.cnum == -1)
+ return 0;
- fd = sys_open(fname,O_RDWR,0);
- if (fd == -1) {
- DEBUG(2,("Couldn't open lock file %s (%s)\n",fname,strerror(errno)));
- return(False);
+ /* If the pid was not found delete the entry from connections.tdb */
+
+ if (cs->Clear && !process_exists(crec.pid) && (errno == ESRCH)) {
+ DEBUG(2,("pid %s doesn't exist - deleting connections %d [%s]\n",
+ procid_str_static(&crec.pid), crec.cnum, crec.name));
+ if (tdb_delete(the_tdb, kbuf) != 0)
+ DEBUG(0,("count_fn: tdb_delete failed with error %s\n", tdb_errorstr(tdb) ));
+ return 0;
}
- if (fcntl_lock(fd,SMB_F_SETLKW,0,1,F_WRLCK)==False) {
- DEBUG(0,("ERROR: can't get lock on %s\n", fname));
+ if (strequal(crec.name, cs->name))
+ cs->curr_connections++;
+
+ return 0;
+}
+
+/****************************************************************************
+ Claim an entry in the connections database.
+****************************************************************************/
+
+int count_current_connections( const char *sharename, BOOL clear )
+{
+ struct count_stat cs;
+
+ cs.mypid = sys_getpid();
+ cs.curr_connections = 0;
+ cs.name = sharename;
+ cs.Clear = clear;
+
+ /*
+ * This has a race condition, but locking the chain before hand is worse
+ * as it leads to deadlock.
+ */
+
+ if (tdb_traverse(tdb, count_fn, &cs) == -1) {
+ DEBUG(0,("claim_connection: traverse of connections.tdb failed with error %s.\n",
+ tdb_errorstr(tdb) ));
return False;
}
+
+ return cs.curr_connections;
+}
- /* find the right spot */
- for (i=0;i<max_connections;i++) {
- if (read(fd, &crec,sizeof(crec)) != sizeof(crec)) {
- DEBUG(2,("Entry not found in lock file %s\n",fname));
- if (fcntl_lock(fd,SMB_F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
- }
- close(fd);
- return(False);
+/****************************************************************************
+ Claim an entry in the connections database.
+****************************************************************************/
+
+BOOL claim_connection(connection_struct *conn, const char *name,int max_connections,BOOL Clear, uint32 msg_flags)
+{
+ struct connections_key key;
+ struct connections_data crec;
+ TDB_DATA kbuf, dbuf;
+
+ if (!tdb) {
+ if ( (tdb =conn_tdb_ctx()) == NULL ) {
+ return False;
}
- if (crec.pid == mypid && crec.cnum == conn->cnum)
- break;
}
+
+ /*
+ * Enforce the max connections parameter.
+ */
- if (crec.pid != mypid || crec.cnum != conn->cnum) {
- if (fcntl_lock(fd,SMB_F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
- }
- close(fd);
- DEBUG(2,("Entry not found in lock file %s\n",fname));
- return(False);
- }
-
- memset((void *)&crec,'\0',sizeof(crec));
-
- /* remove our mark */
- if (sys_lseek(fd,i*sizeof(crec),SEEK_SET) != i*sizeof(crec) ||
- write(fd, &crec,sizeof(crec)) != sizeof(crec)) {
- DEBUG(2,("Couldn't update lock file %s (%s)\n",fname,strerror(errno)));
- if (fcntl_lock(fd,SMB_F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
+ if (max_connections > 0) {
+ int curr_connections;
+
+ curr_connections = count_current_connections( lp_servicename(SNUM(conn)), True );
+
+ if (curr_connections >= max_connections) {
+ DEBUG(1,("claim_connection: Max connections (%d) exceeded for %s\n",
+ max_connections, name ));
+ return False;
}
- close(fd);
- return(False);
}
- if (fcntl_lock(fd,SMB_F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
+ DEBUG(5,("claiming %s %d\n",name,max_connections));
+
+ make_conn_key(conn, name, &kbuf, &key);
+
+ /* fill in the crec */
+ ZERO_STRUCT(crec);
+ crec.magic = 0x280267;
+ crec.pid = procid_self();
+ crec.cnum = conn?conn->cnum:-1;
+ if (conn) {
+ crec.uid = conn->uid;
+ crec.gid = conn->gid;
+ safe_strcpy(crec.name,
+ lp_servicename(SNUM(conn)),sizeof(crec.name)-1);
}
+ crec.start = time(NULL);
+ crec.bcast_msg_flags = msg_flags;
+
+ safe_strcpy(crec.machine,get_remote_machine_name(),sizeof(crec.machine)-1);
+ safe_strcpy(crec.addr,conn?conn->client_address:client_addr(),sizeof(crec.addr)-1);
- DEBUG(3,("Yield successful\n"));
+ dbuf.dptr = (char *)&crec;
+ dbuf.dsize = sizeof(crec);
- close(fd);
- return(True);
+ if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
+ DEBUG(0,("claim_connection: tdb_store failed with error %s.\n",
+ tdb_errorstr(tdb) ));
+ return False;
+ }
+
+ return True;
}
+BOOL register_message_flags(BOOL doreg, uint32 msg_flags)
+{
+ struct connections_key key;
+ struct connections_data *pcrec;
+ TDB_DATA kbuf, dbuf;
-/****************************************************************************
-simple routines to do connection counting
-****************************************************************************/
-BOOL claim_connection(connection_struct *conn,char *name,int max_connections,BOOL Clear)
+ if (!tdb)
+ return False;
+
+ DEBUG(10,("register_message_flags: %s flags 0x%x\n",
+ doreg ? "adding" : "removing",
+ (unsigned int)msg_flags ));
+
+ make_conn_key(NULL, "", &kbuf, &key);
+
+ dbuf = tdb_fetch(tdb, kbuf);
+ if (!dbuf.dptr) {
+ DEBUG(0,("register_message_flags: tdb_fetch failed: %s\n",
+ tdb_errorstr(tdb)));
+ return False;
+ }
+
+ pcrec = (struct connections_data *)dbuf.dptr;
+ if (doreg)
+ pcrec->bcast_msg_flags |= msg_flags;
+ else
+ pcrec->bcast_msg_flags &= ~msg_flags;
+
+ if (tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) != 0) {
+ DEBUG(0,("register_message_flags: tdb_store failed: %s.\n",
+ tdb_errorstr(tdb) ));
+ SAFE_FREE(dbuf.dptr);
+ return False;
+ }
+
+ DEBUG(10,("register_message_flags: new flags 0x%x\n",
+ (unsigned int)pcrec->bcast_msg_flags ));
+
+ SAFE_FREE(dbuf.dptr);
+ return True;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static TDB_DATA* make_pipe_rec_key( struct pipe_open_rec *prec )
{
- extern int Client;
- struct connect_record crec;
- pstring fname;
- int fd=-1;
- int i,foundi= -1;
- int total_recs;
+ TDB_DATA *kbuf = NULL;
+ fstring key_string;
- if (max_connections <= 0)
- return(True);
+ if ( !prec )
+ return NULL;
- DEBUG(5,("trying claim %s %s %d\n",lp_lockdir(),name,max_connections));
-
- pstrcpy(fname,lp_lockdir());
- trim_string(fname,"","/");
+ if ( (kbuf = TALLOC_P(prec, TDB_DATA)) == NULL ) {
+ return NULL;
+ }
- if (!directory_exist(fname,NULL))
- mkdir(fname,0755);
+ snprintf( key_string, sizeof(key_string), "%s/%d/%d",
+ prec->name, procid_to_pid(&prec->pid), prec->pnum );
+
+ if ( (kbuf->dptr = talloc_strdup(prec, key_string)) == NULL )
+ return NULL;
+
+ kbuf->dsize = strlen(key_string)+1;
- pstrcat(fname,"/");
- pstrcat(fname,name);
- pstrcat(fname,".LCK");
+ return kbuf;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static void fill_pipe_open_rec( struct pipe_open_rec *prec, smb_np_struct *p )
+{
+ prec->pid = pid_to_procid(sys_getpid());
+ prec->pnum = p->pnum;
+ prec->uid = geteuid();
+ fstrcpy( prec->name, p->name );
+
+ return;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+BOOL store_pipe_opendb( smb_np_struct *p )
+{
+ struct pipe_open_rec *prec;
+ TDB_DATA *key;
+ TDB_DATA data;
+ TDB_CONTEXT *pipe_tdb;
+ BOOL ret = False;
- if (!file_exist(fname,NULL)) {
- fd = sys_open(fname,O_RDWR|O_CREAT|O_EXCL, 0644);
+ if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
+ DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
+ return False;
}
-
- if (fd == -1) {
- fd = sys_open(fname,O_RDWR,0);
+
+ fill_pipe_open_rec( prec, p );
+ if ( (key = make_pipe_rec_key( prec )) == NULL ) {
+ goto done;
}
- if (fd == -1) {
- DEBUG(1,("couldn't open lock file %s\n",fname));
- return(False);
+ data.dptr = (char*)prec;
+ data.dsize = sizeof(struct pipe_open_rec);
+
+ if ( (pipe_tdb = conn_tdb_ctx() ) == NULL ) {
+ goto done;
}
+
+ ret = (tdb_store( pipe_tdb, *key, data, TDB_REPLACE ) != -1);
+
+done:
+ TALLOC_FREE( prec );
+ return ret;
+}
- if (fcntl_lock(fd,SMB_F_SETLKW,0,1,F_WRLCK)==False) {
- DEBUG(0,("ERROR: can't get lock on %s\n", fname));
- return False;
- }
+/*********************************************************************
+*********************************************************************/
- total_recs = get_file_size(fname) / sizeof(crec);
-
- /* find a free spot */
- for (i=0;i<max_connections;i++) {
- if (i>=total_recs ||
- sys_lseek(fd,i*sizeof(crec),SEEK_SET) != i*sizeof(crec) ||
- read(fd,&crec,sizeof(crec)) != sizeof(crec)) {
- if (foundi < 0) foundi = i;
- break;
- }
-
- if (Clear && crec.pid && !process_exists(crec.pid)) {
- if(sys_lseek(fd,i*sizeof(crec),SEEK_SET) != i*sizeof(crec)) {
- DEBUG(0,("claim_connection: ERROR: sys_lseek failed to seek \
-to %d\n", (int)(i*sizeof(crec)) ));
- continue;
- }
- memset((void *)&crec,'\0',sizeof(crec));
- write(fd, &crec,sizeof(crec));
- if (foundi < 0) foundi = i;
- continue;
- }
- if (foundi < 0 && (!crec.pid || !process_exists(crec.pid))) {
- foundi=i;
- if (!Clear) break;
- }
- }
-
- if (foundi < 0) {
- DEBUG(3,("no free locks in %s\n",fname));
- if (fcntl_lock(fd,SMB_F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
- }
- close(fd);
- return(False);
- }
+BOOL delete_pipe_opendb( smb_np_struct *p )
+{
+ struct pipe_open_rec *prec;
+ TDB_DATA *key;
+ TDB_CONTEXT *pipe_tdb;
+ BOOL ret = False;
- /* fill in the crec */
- memset((void *)&crec,'\0',sizeof(crec));
- crec.magic = 0x280267;
- crec.pid = getpid();
- if (conn) {
- crec.cnum = conn->cnum;
- crec.uid = conn->uid;
- crec.gid = conn->gid;
- StrnCpy(crec.name,
- lp_servicename(SNUM(conn)),sizeof(crec.name)-1);
- } else {
- crec.cnum = -1;
+ if ( (prec = TALLOC_P( NULL, struct pipe_open_rec)) == NULL ) {
+ DEBUG(0,("store_pipe_opendb: talloc failed!\n"));
+ return False;
}
- crec.start = time(NULL);
- StrnCpy(crec.machine,remote_machine,sizeof(crec.machine)-1);
- StrnCpy(crec.addr,client_addr(Client),sizeof(crec.addr)-1);
+ fill_pipe_open_rec( prec, p );
+ if ( (key = make_pipe_rec_key( prec )) == NULL ) {
+ goto done;
+ }
- /* make our mark */
- if (sys_lseek(fd,foundi*sizeof(crec),SEEK_SET) != foundi*sizeof(crec) ||
- write(fd, &crec,sizeof(crec)) != sizeof(crec)) {
- if (fcntl_lock(fd,SMB_F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
- }
- close(fd);
- return(False);
+ if ( (pipe_tdb = conn_tdb_ctx() ) == NULL ) {
+ goto done;
}
- if (fcntl_lock(fd,SMB_F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
- }
+ ret = (tdb_delete( pipe_tdb, *key ) != -1 );
- close(fd);
- return(True);
+done:
+ TALLOC_FREE( prec );
+ return ret;
}
git.samba.org / vlendec / samba-autobuild / .git / blobdiff