/*
- Unix SMB/Netbios implementation.
- Version 1.9.
+ Unix SMB/CIFS implementation.
connection claim routines
Copyright (C) Andrew Tridgell 1998
#include "includes.h"
-
-extern fstring remote_machine;
-
-extern int DEBUGLEVEL;
+static TDB_CONTEXT *tdb;
/****************************************************************************
-simple routines to do connection counting
+ Return the connection tdb context (used for message send all).
****************************************************************************/
-BOOL yield_connection(connection_struct *conn,char *name,int max_connections)
-{
- struct connect_record crec;
- pstring fname;
- int fd;
- int mypid = getpid();
- int i;
- DEBUG(3,("Yielding connection to %s\n",name));
+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);
- if (max_connections <= 0)
- return(True);
+ return tdb;
+}
- bzero(&crec,sizeof(crec));
+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
- pstrcpy(fname,lp_lockdir());
- trim_string(fname,"","/");
+ pkbuf->dptr = (char *)pkey;
+ pkbuf->dsize = sizeof(*pkey);
+}
- pstrcat(fname,"/");
- pstrcat(fname,name);
- pstrcat(fname,".LCK");
+/****************************************************************************
+ Delete a connection record.
+****************************************************************************/
- fd = open(fname,O_RDWR);
- if (fd == -1) {
- DEBUG(2,("Couldn't open lock file %s (%s)\n",fname,strerror(errno)));
- return(False);
- }
+BOOL yield_connection(connection_struct *conn, const char *name)
+{
+ struct connections_key key;
+ TDB_DATA kbuf;
- if (fcntl_lock(fd,F_SETLKW,0,1,F_WRLCK)==False) {
- DEBUG(0,("ERROR: can't get lock on %s\n", fname));
+ if (!tdb)
return False;
- }
- /* 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,F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
- }
- close(fd);
- return(False);
- }
- if (crec.pid == mypid && crec.cnum == conn->cnum)
- break;
- }
+ DEBUG(3,("Yielding connection to %s\n",name));
- if (crec.pid != mypid || crec.cnum != conn->cnum) {
- if (fcntl_lock(fd,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);
- }
+ make_conn_key(conn, name, &kbuf, &key);
- bzero((void *)&crec,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,F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
- }
- close(fd);
- return(False);
+ 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);
}
- if (fcntl_lock(fd,F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
- }
-
- DEBUG(3,("Yield successful\n"));
-
- close(fd);
return(True);
}
+struct count_stat {
+ pid_t mypid;
+ int curr_connections;
+ char *name;
+ BOOL Clear;
+};
/****************************************************************************
-simple routines to do connection counting
+ Count the entries belonging to a service in the connection db.
****************************************************************************/
-BOOL claim_connection(connection_struct *conn,char *name,int max_connections,BOOL Clear)
+
+static int count_fn( TDB_CONTEXT *the_tdb, TDB_DATA kbuf, TDB_DATA dbuf, void *udp)
{
- extern int Client;
- struct connect_record crec;
- pstring fname;
- int fd=-1;
- int i,foundi= -1;
- int total_recs;
-
- if (max_connections <= 0)
- return(True);
-
- DEBUG(5,("trying claim %s %s %d\n",lp_lockdir(),name,max_connections));
-
- pstrcpy(fname,lp_lockdir());
- trim_string(fname,"","/");
-
- if (!directory_exist(fname,NULL))
- mkdir(fname,0755);
-
- pstrcat(fname,"/");
- pstrcat(fname,name);
- pstrcat(fname,".LCK");
-
- if (!file_exist(fname,NULL)) {
- fd = open(fname,O_RDWR|O_CREAT|O_EXCL, 0644);
+ struct connections_data crec;
+ struct count_stat *cs = (struct count_stat *)udp;
+
+ if (dbuf.dsize != sizeof(crec))
+ return 0;
+
+ memcpy(&crec, dbuf.dptr, sizeof(crec));
+
+ if (crec.cnum == -1)
+ return 0;
+
+ /* 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 (fd == -1) {
- fd = open(fname,O_RDWR);
- }
-
- if (fd == -1) {
- DEBUG(1,("couldn't open lock file %s\n",fname));
- return(False);
- }
+ if (strequal(crec.name, cs->name))
+ cs->curr_connections++;
+
+ return 0;
+}
- if (fcntl_lock(fd,F_SETLKW,0,1,F_WRLCK)==False) {
- DEBUG(0,("ERROR: can't get lock on %s\n", fname));
+/****************************************************************************
+ 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)
+ tdb = tdb_open_log(lock_path("connections.tdb"), 0, TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
+ O_RDWR | O_CREAT, 0644);
+
+ if (!tdb)
return False;
- }
- total_recs = 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)) {
- sys_lseek(fd,i*sizeof(crec),SEEK_SET);
- bzero((void *)&crec,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;
+ /*
+ * Enforce the max connections parameter.
+ */
+
+ if (max_connections > 0) {
+ struct count_stat cs;
+
+ cs.mypid = sys_getpid();
+ cs.curr_connections = 0;
+ cs.name = lp_servicename(SNUM(conn));
+ 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;
}
- }
-
- if (foundi < 0) {
- DEBUG(3,("no free locks in %s\n",fname));
- if (fcntl_lock(fd,F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
+
+ if (cs.curr_connections >= max_connections) {
+ DEBUG(1,("claim_connection: Max connections (%d) exceeded for %s\n",
+ max_connections, name ));
+ return False;
}
- close(fd);
- return(False);
- }
-
+ }
+
+ DEBUG(5,("claiming %s %d\n",name,max_connections));
+
+ make_conn_key(conn, name, &kbuf, &key);
+
/* fill in the crec */
- bzero((void *)&crec,sizeof(crec));
+ ZERO_STRUCT(crec);
crec.magic = 0x280267;
- crec.pid = getpid();
+ crec.pid = procid_self();
+ crec.cnum = conn?conn->cnum:-1;
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;
+ safe_strcpy(crec.name,
+ lp_servicename(SNUM(conn)),sizeof(crec.name)-1);
}
crec.start = time(NULL);
+ crec.bcast_msg_flags = msg_flags;
- StrnCpy(crec.machine,remote_machine,sizeof(crec.machine)-1);
- StrnCpy(crec.addr,client_addr(Client),sizeof(crec.addr)-1);
-
- /* 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,F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
- }
- close(fd);
- return(False);
+ 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);
+
+ dbuf.dptr = (char *)&crec;
+ dbuf.dsize = sizeof(crec);
+
+ 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;
}
- if (fcntl_lock(fd,F_SETLKW,0,1,F_UNLCK)==False) {
- DEBUG(0,("ERROR: can't release lock on %s\n", fname));
+ return True;
+}
+
+BOOL register_message_flags(BOOL doreg, uint32 msg_flags)
+{
+ struct connections_key key;
+ struct connections_data *pcrec;
+ TDB_DATA kbuf, dbuf;
+
+ 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;
}
-
- close(fd);
- return(True);
+
+ 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;
}
git.samba.org / tprouty / samba.git / blobdiff