mirror of
https://github.com/samba-team/samba.git
synced 2024-12-24 21:34:56 +03:00
1ea570da83
letting us change the date unless tar_real_noisy is True.
Also updated a few places where variables are declared but not set.
(This used to be commit b46f1024c9
)
625 lines
20 KiB
C
625 lines
20 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 1.9.
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Blocking Locking functions
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Copyright (C) Jeremy Allison 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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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extern int DEBUGLEVEL;
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extern int Client;
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extern int chain_size;
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extern char *OutBuffer;
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/****************************************************************************
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This is the structure to queue to implement blocking locks.
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notify. It consists of the requesting SMB and the expiry time.
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*****************************************************************************/
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typedef struct {
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ubi_slNode msg_next;
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int com_type;
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files_struct *fsp;
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time_t expire_time;
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int lock_num;
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char *inbuf;
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int length;
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} blocking_lock_record;
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static ubi_slList blocking_lock_queue = { NULL, (ubi_slNodePtr)&blocking_lock_queue, 0};
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/****************************************************************************
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Destructor for the above structure.
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****************************************************************************/
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static void free_blocking_lock_record(blocking_lock_record *blr)
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{
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free(blr->inbuf);
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free((char *)blr);
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}
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/****************************************************************************
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Get the files_struct given a particular queued SMB.
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*****************************************************************************/
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static files_struct *get_fsp_from_pkt(char *inbuf)
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{
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switch(CVAL(inbuf,smb_com)) {
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case SMBlock:
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case SMBlockread:
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return file_fsp(inbuf,smb_vwv0);
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case SMBlockingX:
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return file_fsp(inbuf,smb_vwv2);
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default:
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DEBUG(0,("get_fsp_from_pkt: PANIC - unknown type on blocking lock queue - exiting.!\n"));
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exit_server("PANIC - unknown type on blocking lock queue");
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}
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return NULL; /* Keep compiler happy. */
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}
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/****************************************************************************
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Determine if this is a secondary element of a chained SMB.
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**************************************************************************/
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static BOOL in_chained_smb(void)
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{
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return (chain_size != 0);
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}
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/****************************************************************************
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Function to push a blocking lock request onto the lock queue.
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****************************************************************************/
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BOOL push_blocking_lock_request( char *inbuf, int length, int lock_timeout, int lock_num)
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{
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blocking_lock_record *blr;
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if(in_chained_smb() ) {
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DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
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return False;
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}
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/*
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* Now queue an entry on the blocking lock queue. We setup
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* the expiration time here.
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*/
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if((blr = (blocking_lock_record *)malloc(sizeof(blocking_lock_record))) == NULL) {
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DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
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return False;
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}
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if((blr->inbuf = (char *)malloc(length)) == NULL) {
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DEBUG(0,("push_blocking_lock_request: Malloc fail (2)!\n" ));
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free((char *)blr);
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return False;
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}
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blr->com_type = CVAL(inbuf,smb_com);
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blr->fsp = get_fsp_from_pkt(inbuf);
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blr->expire_time = (lock_timeout == -1) ? (time_t)-1 : time(NULL) + (time_t)lock_timeout;
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blr->lock_num = lock_num;
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memcpy(blr->inbuf, inbuf, length);
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blr->length = length;
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ubi_slAddTail(&blocking_lock_queue, blr);
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DEBUG(3,("push_blocking_lock_request: lock request length=%d blocked with expiry time %d \
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for fnum = %d, name = %s\n", length, (int)blr->expire_time,
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blr->fsp->fnum, blr->fsp->fsp_name ));
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return True;
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}
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/****************************************************************************
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Return a smd with a given size.
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*****************************************************************************/
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static void send_blocking_reply(char *outbuf, int outsize)
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{
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if(outsize > 4)
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smb_setlen(outbuf,outsize - 4);
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send_smb(Client,outbuf);
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}
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/****************************************************************************
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Return a lockingX success SMB.
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*****************************************************************************/
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static void reply_lockingX_success(blocking_lock_record *blr)
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{
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char *outbuf = OutBuffer;
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int bufsize = BUFFER_SIZE;
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char *inbuf = blr->inbuf;
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int outsize = 0;
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construct_reply_common(inbuf, outbuf);
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set_message(outbuf,2,0,True);
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/*
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* As this message is a lockingX call we must handle
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* any following chained message correctly.
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* This is normally handled in construct_reply(),
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* but as that calls switch_message, we can't use
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* that here and must set up the chain info manually.
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*/
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outsize = chain_reply(inbuf,outbuf,blr->length,bufsize);
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outsize += chain_size;
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send_blocking_reply(outbuf,outsize);
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}
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/****************************************************************************
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Return a generic lock fail error blocking call.
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*****************************************************************************/
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static void generic_blocking_lock_error(blocking_lock_record *blr, int eclass, int32 ecode)
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{
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char *outbuf = OutBuffer;
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char *inbuf = blr->inbuf;
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construct_reply_common(inbuf, outbuf);
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if(eclass == 0) /* NT Error. */
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SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2) | FLAGS2_32_BIT_ERROR_CODES);
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ERROR(eclass,ecode);
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send_smb(Client,outbuf);
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}
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/****************************************************************************
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Return a lock fail error for a lockingX call. Undo all the locks we have
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obtained first.
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*****************************************************************************/
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static void reply_lockingX_error(blocking_lock_record *blr, int eclass, int32 ecode)
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{
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char *inbuf = blr->inbuf;
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files_struct *fsp = blr->fsp;
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connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
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uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
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SMB_OFF_T count = (SMB_OFF_T) 0, offset = (SMB_OFF_T) 0;
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unsigned char locktype = CVAL(inbuf,smb_vwv3);
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BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
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char *data;
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int i;
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data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
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/*
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* Data now points at the beginning of the list
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* of smb_lkrng structs.
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*/
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for(i = blr->lock_num; i >= 0; i--) {
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int dummy1;
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uint32 dummy2;
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if(!large_file_format) {
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count = IVAL(data,SMB_LKLEN_OFFSET(i));
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offset = IVAL(data,SMB_LKOFF_OFFSET(i));
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}
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#ifdef LARGE_SMB_OFF_T
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else {
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count = (((SMB_OFF_T) IVAL(data,SMB_LARGE_LKLEN_OFFSET_HIGH(i))) << 32) |
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((SMB_OFF_T) IVAL(data,SMB_LARGE_LKLEN_OFFSET_LOW(i)));
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offset = (((SMB_OFF_T) IVAL(data,SMB_LARGE_LKOFF_OFFSET_HIGH(i))) << 32) |
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((SMB_OFF_T) IVAL(data,SMB_LARGE_LKOFF_OFFSET_LOW(i)));
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}
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#endif /* LARGE_SMB_OFF_T */
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do_unlock(fsp,conn,count,offset,&dummy1,&dummy2);
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}
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generic_blocking_lock_error(blr, eclass, ecode);
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}
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/****************************************************************************
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Return a lock fail error.
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*****************************************************************************/
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static void blocking_lock_reply_error(blocking_lock_record *blr, int eclass, int32 ecode)
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{
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switch(blr->com_type) {
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case SMBlock:
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generic_blocking_lock_error(blr, eclass, ecode);
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break;
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case SMBlockread:
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generic_blocking_lock_error(blr, eclass, ecode);
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break;
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case SMBlockingX:
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reply_lockingX_error(blr, eclass, ecode);
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break;
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default:
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DEBUG(0,("blocking_lock_reply_error: PANIC - unknown type on blocking lock queue - exiting.!\n"));
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exit_server("PANIC - unknown type on blocking lock queue");
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}
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}
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/****************************************************************************
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Attempt to finish off getting all pending blocking locks for a lockread call.
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Returns True if we want to be removed from the list.
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*****************************************************************************/
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static BOOL process_lockread(blocking_lock_record *blr)
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{
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char *outbuf = OutBuffer;
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char *inbuf = blr->inbuf;
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ssize_t nread = -1;
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char *data;
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int outsize = 0;
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SMB_OFF_T startpos;
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size_t numtoread;
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int eclass;
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uint32 ecode;
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connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
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files_struct *fsp = blr->fsp;
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numtoread = SVAL(inbuf,smb_vwv1);
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startpos = IVAL(inbuf,smb_vwv2);
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numtoread = MIN(BUFFER_SIZE-outsize,numtoread);
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data = smb_buf(outbuf) + 3;
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if(!do_lock( fsp, conn, numtoread, startpos, F_RDLCK, &eclass, &ecode)) {
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if((errno != EACCES) && (errno != EAGAIN)) {
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/*
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* We have other than a "can't get lock" POSIX
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* error. Send an error.
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* Return True so we get dequeued.
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*/
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generic_blocking_lock_error(blr, eclass, ecode);
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return True;
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}
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/*
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* Still waiting for lock....
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*/
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DEBUG(10,("process_lockread: failed to get lock for file = %s. Still waiting....\n",
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fsp->fsp_name));
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return False;
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}
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nread = read_file(fsp,data,startpos,numtoread);
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if (nread < 0) {
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generic_blocking_lock_error(blr,ERRDOS,ERRnoaccess);
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return True;
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}
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construct_reply_common(inbuf, outbuf);
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outsize = set_message(outbuf,5,3,True);
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outsize += nread;
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SSVAL(outbuf,smb_vwv0,nread);
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SSVAL(outbuf,smb_vwv5,nread+3);
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SSVAL(smb_buf(outbuf),1,nread);
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DEBUG(3, ( "process_lockread file = %s, fnum=%d num=%d nread=%d\n",
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fsp->fsp_name, fsp->fnum, numtoread, nread ) );
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send_blocking_reply(outbuf,outsize);
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return True;
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}
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/****************************************************************************
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Attempt to finish off getting all pending blocking locks for a lock call.
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Returns True if we want to be removed from the list.
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*****************************************************************************/
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static BOOL process_lock(blocking_lock_record *blr)
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{
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char *outbuf = OutBuffer;
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char *inbuf = blr->inbuf;
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int outsize;
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SMB_OFF_T count = 0, offset = 0;
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int eclass;
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uint32 ecode;
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connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
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files_struct *fsp = blr->fsp;
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count = IVAL(inbuf,smb_vwv1);
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offset = IVAL(inbuf,smb_vwv3);
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errno = 0;
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if (!do_lock(fsp, conn, count, offset, F_WRLCK, &eclass, &ecode)) {
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if((errno != EACCES) && (errno != EAGAIN)) {
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/*
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* We have other than a "can't get lock" POSIX
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* error. Send an error.
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* Return True so we get dequeued.
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*/
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blocking_lock_reply_error(blr, eclass, ecode);
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return True;
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}
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/*
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* Still can't get the lock - keep waiting.
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*/
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DEBUG(10,("process_lock: failed to get lock for file = %s. Still waiting....\n",
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fsp->fsp_name));
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return False;
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}
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/*
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* Success - we got the lock.
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*/
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DEBUG(3,("process_lock : file=%s fnum=%d offset=%.0f count=%.0f\n",
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fsp->fsp_name, fsp->fnum, (double)offset, (double)count));
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construct_reply_common(inbuf, outbuf);
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outsize = set_message(outbuf,0,0,True);
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send_blocking_reply(outbuf,outsize);
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return True;
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}
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/****************************************************************************
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Attempt to finish off getting all pending blocking locks for a lockingX call.
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Returns True if we want to be removed from the list.
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*****************************************************************************/
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static BOOL process_lockingX(blocking_lock_record *blr)
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{
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char *inbuf = blr->inbuf;
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unsigned char locktype = CVAL(inbuf,smb_vwv3);
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files_struct *fsp = blr->fsp;
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connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
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uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
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uint16 num_locks = SVAL(inbuf,smb_vwv7);
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SMB_OFF_T count = 0, offset = 0;
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BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
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char *data;
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int eclass=0;
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uint32 ecode=0;
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data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
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/*
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* Data now points at the beginning of the list
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* of smb_lkrng structs.
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*/
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for(; blr->lock_num < num_locks; blr->lock_num++) {
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if(!large_file_format) {
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count = IVAL(data,SMB_LKLEN_OFFSET(blr->lock_num));
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offset = IVAL(data,SMB_LKOFF_OFFSET(blr->lock_num));
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}
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#ifdef LARGE_SMB_OFF_T
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else {
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count = (((SMB_OFF_T) IVAL(data,SMB_LARGE_LKLEN_OFFSET_HIGH(blr->lock_num))) << 32) |
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((SMB_OFF_T) IVAL(data,SMB_LARGE_LKLEN_OFFSET_LOW(blr->lock_num)));
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offset = (((SMB_OFF_T) IVAL(data,SMB_LARGE_LKOFF_OFFSET_HIGH(blr->lock_num))) << 32) |
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((SMB_OFF_T) IVAL(data,SMB_LARGE_LKOFF_OFFSET_LOW(blr->lock_num)));
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}
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#endif /* LARGE_SMB_OFF_T */
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errno = 0;
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if(!do_lock(fsp,conn,count,offset, ((locktype & 1) ? F_RDLCK : F_WRLCK),
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&eclass, &ecode))
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break;
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}
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if(blr->lock_num == num_locks) {
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/*
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* Success - we got all the locks.
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*/
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DEBUG(3,("process_lockingX file = %s, fnum=%d type=%d num_locks=%d\n",
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fsp->fsp_name, fsp->fnum, (unsigned int)locktype, num_locks) );
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reply_lockingX_success(blr);
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return True;
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} else if((errno != EACCES) && (errno != EAGAIN)) {
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/*
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* We have other than a "can't get lock" POSIX
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* error. Free any locks we had and return an error.
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* Return True so we get dequeued.
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*/
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blocking_lock_reply_error(blr, eclass, ecode);
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return True;
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}
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/*
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* Still can't get all the locks - keep waiting.
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*/
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DEBUG(10,("process_lockingX: only got %d locks of %d needed for file %s, fnum = %d. \
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Waiting....\n", blr->lock_num, num_locks, fsp->fsp_name, fsp->fnum));
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return False;
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}
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/****************************************************************************
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Process a blocking lock SMB.
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Returns True if we want to be removed from the list.
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*****************************************************************************/
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static BOOL blocking_lock_record_process(blocking_lock_record *blr)
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{
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switch(blr->com_type) {
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case SMBlock:
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return process_lock(blr);
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case SMBlockread:
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return process_lockread(blr);
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case SMBlockingX:
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return process_lockingX(blr);
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default:
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DEBUG(0,("blocking_lock_record_process: PANIC - unknown type on blocking lock queue - exiting.!\n"));
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exit_server("PANIC - unknown type on blocking lock queue");
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}
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return False; /* Keep compiler happy. */
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}
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/****************************************************************************
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Delete entries by fnum from the blocking lock pending queue.
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*****************************************************************************/
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void remove_pending_lock_requests_by_fid(files_struct *fsp)
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{
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blocking_lock_record *blr = (blocking_lock_record *)ubi_slFirst( &blocking_lock_queue );
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blocking_lock_record *prev = NULL;
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while(blr != NULL) {
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if(blr->fsp->fnum == fsp->fnum) {
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DEBUG(10,("remove_pending_lock_requests_by_fid - removing request type %d for \
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file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
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free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
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blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
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continue;
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}
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prev = blr;
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blr = (blocking_lock_record *)ubi_slNext(blr);
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}
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}
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/****************************************************************************
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Delete entries by mid from the blocking lock pending queue. Always send reply.
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*****************************************************************************/
|
|
|
|
void remove_pending_lock_requests_by_mid(int mid)
|
|
{
|
|
blocking_lock_record *blr = (blocking_lock_record *)ubi_slFirst( &blocking_lock_queue );
|
|
blocking_lock_record *prev = NULL;
|
|
|
|
while(blr != NULL) {
|
|
if(SVAL(blr->inbuf,smb_mid) == mid) {
|
|
files_struct *fsp = blr->fsp;
|
|
|
|
DEBUG(10,("remove_pending_lock_requests_by_mid - removing request type %d for \
|
|
file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
|
|
|
|
blocking_lock_reply_error(blr,0,NT_STATUS_CANCELLED);
|
|
free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
|
|
blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
|
|
continue;
|
|
}
|
|
|
|
prev = blr;
|
|
blr = (blocking_lock_record *)ubi_slNext(blr);
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
Process the blocking lock queue. Note that this is only called as root.
|
|
*****************************************************************************/
|
|
|
|
void process_blocking_lock_queue(time_t t)
|
|
{
|
|
blocking_lock_record *blr = (blocking_lock_record *)ubi_slFirst( &blocking_lock_queue );
|
|
blocking_lock_record *prev = NULL;
|
|
|
|
if(blr == NULL)
|
|
return;
|
|
|
|
/*
|
|
* Go through the queue and see if we can get any of the locks.
|
|
*/
|
|
|
|
while(blr != NULL) {
|
|
connection_struct *conn = NULL;
|
|
uint16 vuid;
|
|
files_struct *fsp = NULL;
|
|
|
|
/*
|
|
* Ensure we don't have any old chain_fsp values
|
|
* sitting around....
|
|
*/
|
|
chain_size = 0;
|
|
file_chain_reset();
|
|
fsp = blr->fsp;
|
|
|
|
conn = conn_find(SVAL(blr->inbuf,smb_tid));
|
|
vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID :
|
|
SVAL(blr->inbuf,smb_uid);
|
|
|
|
DEBUG(5,("process_blocking_lock_queue: examining pending lock fnum = %d for file %s\n",
|
|
fsp->fnum, fsp->fsp_name ));
|
|
|
|
if((blr->expire_time != -1) && (blr->expire_time > t)) {
|
|
/*
|
|
* Lock expired - throw away all previously
|
|
* obtained locks and return lock error.
|
|
*/
|
|
DEBUG(5,("process_blocking_lock_queue: pending lock fnum = %d for file %s timed out.\n",
|
|
fsp->fnum, fsp->fsp_name ));
|
|
|
|
blocking_lock_reply_error(blr,ERRSRV,ERRaccess);
|
|
free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
|
|
blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
|
|
continue;
|
|
}
|
|
|
|
if(!become_user(conn,vuid)) {
|
|
DEBUG(0,("process_blocking_lock_queue: Unable to become user vuid=%d.\n",
|
|
vuid ));
|
|
/*
|
|
* Remove the entry and return an error to the client.
|
|
*/
|
|
blocking_lock_reply_error(blr,ERRSRV,ERRaccess);
|
|
free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
|
|
blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
|
|
continue;
|
|
}
|
|
|
|
if(!become_service(conn,True)) {
|
|
DEBUG(0,("process_blocking_lock_queue: Unable to become service Error was %s.\n", strerror(errno) ));
|
|
/*
|
|
* Remove the entry and return an error to the client.
|
|
*/
|
|
blocking_lock_reply_error(blr,ERRSRV,ERRaccess);
|
|
free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
|
|
blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
|
|
unbecome_user();
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Go through the remaining locks and try and obtain them.
|
|
* The call returns True if all locks were obtained successfully
|
|
* and False if we still need to wait.
|
|
*/
|
|
|
|
if(blocking_lock_record_process(blr)) {
|
|
free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
|
|
blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
|
|
unbecome_user();
|
|
continue;
|
|
}
|
|
|
|
unbecome_user();
|
|
|
|
/*
|
|
* Move to the next in the list.
|
|
*/
|
|
prev = blr;
|
|
blr = (blocking_lock_record *)ubi_slNext(blr);
|
|
}
|
|
}
|