summaryrefslogtreecommitdiff
path: root/source3/smbd/blocking.c
diff options
context:
space:
mode:
Diffstat (limited to 'source3/smbd/blocking.c')
-rw-r--r--source3/smbd/blocking.c931
1 files changed, 931 insertions, 0 deletions
diff --git a/source3/smbd/blocking.c b/source3/smbd/blocking.c
new file mode 100644
index 0000000000..479361a8c1
--- /dev/null
+++ b/source3/smbd/blocking.c
@@ -0,0 +1,931 @@
+/*
+ Unix SMB/CIFS implementation.
+ Blocking Locking functions
+ Copyright (C) Jeremy Allison 1998-2003
+
+ 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"
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_LOCKING
+
+/****************************************************************************
+ This is the structure to queue to implement blocking locks.
+ notify. It consists of the requesting SMB and the expiry time.
+*****************************************************************************/
+
+typedef struct _blocking_lock_record {
+ struct _blocking_lock_record *next;
+ struct _blocking_lock_record *prev;
+ int com_type;
+ files_struct *fsp;
+ struct timeval expire_time;
+ int lock_num;
+ SMB_BIG_UINT offset;
+ SMB_BIG_UINT count;
+ uint32 lock_pid;
+ uint32 blocking_pid; /* PID that blocks us. */
+ enum brl_flavour lock_flav;
+ enum brl_type lock_type;
+ char *inbuf;
+ int length;
+ bool encrypted;
+} blocking_lock_record;
+
+/* dlink list we store pending lock records on. */
+static blocking_lock_record *blocking_lock_queue;
+
+/* dlink list we move cancelled lock records onto. */
+static blocking_lock_record *blocking_lock_cancelled_queue;
+
+/* The event that makes us process our blocking lock queue */
+static struct timed_event *brl_timeout;
+
+/****************************************************************************
+ Destructor for the above structure.
+****************************************************************************/
+
+static void free_blocking_lock_record(blocking_lock_record *blr)
+{
+ SAFE_FREE(blr->inbuf);
+ SAFE_FREE(blr);
+}
+
+/****************************************************************************
+ Determine if this is a secondary element of a chained SMB.
+ **************************************************************************/
+
+static bool in_chained_smb(void)
+{
+ return (chain_size != 0);
+}
+
+static void received_unlock_msg(struct messaging_context *msg,
+ void *private_data,
+ uint32_t msg_type,
+ struct server_id server_id,
+ DATA_BLOB *data);
+static void process_blocking_lock_queue(void);
+
+static void brl_timeout_fn(struct event_context *event_ctx,
+ struct timed_event *te,
+ const struct timeval *now,
+ void *private_data)
+{
+ SMB_ASSERT(brl_timeout == te);
+ TALLOC_FREE(brl_timeout);
+
+ change_to_root_user(); /* TODO: Possibly run all timed events as
+ * root */
+
+ process_blocking_lock_queue();
+}
+
+/****************************************************************************
+ After a change to blocking_lock_queue, recalculate the timed_event for the
+ next processing.
+****************************************************************************/
+
+static bool recalc_brl_timeout(void)
+{
+ blocking_lock_record *brl;
+ struct timeval next_timeout;
+
+ TALLOC_FREE(brl_timeout);
+
+ next_timeout = timeval_zero();
+
+ for (brl = blocking_lock_queue; brl; brl = brl->next) {
+ if (timeval_is_zero(&brl->expire_time)) {
+ /*
+ * If we're blocked on pid 0xFFFFFFFF this is
+ * a POSIX lock, so calculate a timeout of
+ * 10 seconds into the future.
+ */
+ if (brl->blocking_pid == 0xFFFFFFFF) {
+ struct timeval psx_to = timeval_current_ofs(10, 0);
+ next_timeout = timeval_min(&next_timeout, &psx_to);
+ }
+
+ continue;
+ }
+
+ if (timeval_is_zero(&next_timeout)) {
+ next_timeout = brl->expire_time;
+ }
+ else {
+ next_timeout = timeval_min(&next_timeout,
+ &brl->expire_time);
+ }
+ }
+
+ if (timeval_is_zero(&next_timeout)) {
+ return True;
+ }
+
+ if (!(brl_timeout = event_add_timed(smbd_event_context(), NULL,
+ next_timeout, "brl_timeout",
+ brl_timeout_fn, NULL))) {
+ return False;
+ }
+
+ return True;
+}
+
+
+/****************************************************************************
+ Function to push a blocking lock request onto the lock queue.
+****************************************************************************/
+
+bool push_blocking_lock_request( struct byte_range_lock *br_lck,
+ const struct smb_request *req,
+ files_struct *fsp,
+ int lock_timeout,
+ int lock_num,
+ uint32 lock_pid,
+ enum brl_type lock_type,
+ enum brl_flavour lock_flav,
+ SMB_BIG_UINT offset,
+ SMB_BIG_UINT count,
+ uint32 blocking_pid)
+{
+ static bool set_lock_msg;
+ size_t length = smb_len(req->inbuf)+4;
+ blocking_lock_record *blr;
+ NTSTATUS status;
+
+ if(in_chained_smb() ) {
+ DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
+ return False;
+ }
+
+ /*
+ * Now queue an entry on the blocking lock queue. We setup
+ * the expiration time here.
+ */
+
+ if((blr = SMB_MALLOC_P(blocking_lock_record)) == NULL) {
+ DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
+ return False;
+ }
+
+ blr->next = NULL;
+ blr->prev = NULL;
+
+ if((blr->inbuf = (char *)SMB_MALLOC(length)) == NULL) {
+ DEBUG(0,("push_blocking_lock_request: Malloc fail (2)!\n" ));
+ SAFE_FREE(blr);
+ return False;
+ }
+
+ blr->com_type = CVAL(req->inbuf,smb_com);
+ blr->fsp = fsp;
+ if (lock_timeout == -1) {
+ blr->expire_time.tv_sec = 0;
+ blr->expire_time.tv_usec = 0; /* Never expire. */
+ } else {
+ blr->expire_time = timeval_current_ofs(lock_timeout/1000,
+ (lock_timeout % 1000) * 1000);
+ }
+ blr->lock_num = lock_num;
+ blr->lock_pid = lock_pid;
+ blr->blocking_pid = blocking_pid;
+ blr->lock_flav = lock_flav;
+ blr->lock_type = lock_type;
+ blr->offset = offset;
+ blr->count = count;
+ memcpy(blr->inbuf, req->inbuf, length);
+ blr->length = length;
+ blr->encrypted = req->encrypted;
+
+ /* Add a pending lock record for this. */
+ status = brl_lock(smbd_messaging_context(), br_lck,
+ lock_pid,
+ procid_self(),
+ offset,
+ count,
+ lock_type == READ_LOCK ? PENDING_READ_LOCK : PENDING_WRITE_LOCK,
+ blr->lock_flav,
+ lock_timeout ? True : False, /* blocking_lock. */
+ NULL);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("push_blocking_lock_request: failed to add PENDING_LOCK record.\n"));
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ return False;
+ }
+
+ DLIST_ADD_END(blocking_lock_queue, blr, blocking_lock_record *);
+ recalc_brl_timeout();
+
+ /* Ensure we'll receive messages when this is unlocked. */
+ if (!set_lock_msg) {
+ messaging_register(smbd_messaging_context(), NULL,
+ MSG_SMB_UNLOCK, received_unlock_msg);
+ set_lock_msg = True;
+ }
+
+ DEBUG(3,("push_blocking_lock_request: lock request length=%u blocked with "
+ "expiry time (%u sec. %u usec) (+%d msec) for fnum = %d, name = %s\n",
+ (unsigned int)length, (unsigned int)blr->expire_time.tv_sec,
+ (unsigned int)blr->expire_time.tv_usec, lock_timeout,
+ blr->fsp->fnum, blr->fsp->fsp_name ));
+
+ /* Push the MID of this packet on the signing queue. */
+ srv_defer_sign_response(SVAL(req->inbuf,smb_mid));
+
+ return True;
+}
+
+/****************************************************************************
+ Return a lockingX success SMB.
+*****************************************************************************/
+
+static void reply_lockingX_success(blocking_lock_record *blr)
+{
+ struct smb_request *req;
+
+ if (!(req = talloc(talloc_tos(), struct smb_request))) {
+ smb_panic("Could not allocate smb_request");
+ }
+
+ init_smb_request(req, (uint8 *)blr->inbuf, 0, blr->encrypted);
+ reply_outbuf(req, 2, 0);
+
+ /*
+ * As this message is a lockingX call we must handle
+ * any following chained message correctly.
+ * This is normally handled in construct_reply(),
+ * but as that calls switch_message, we can't use
+ * that here and must set up the chain info manually.
+ */
+
+ chain_reply(req);
+
+ if (!srv_send_smb(smbd_server_fd(),
+ (char *)req->outbuf,
+ IS_CONN_ENCRYPTED(blr->fsp->conn))) {
+ exit_server_cleanly("send_blocking_reply: srv_send_smb failed.");
+ }
+}
+
+/****************************************************************************
+ Return a generic lock fail error blocking call.
+*****************************************************************************/
+
+static void generic_blocking_lock_error(blocking_lock_record *blr, NTSTATUS status)
+{
+ char outbuf[smb_size];
+ char *inbuf = blr->inbuf;
+
+ construct_reply_common(inbuf, outbuf);
+
+ /* whenever a timeout is given w2k maps LOCK_NOT_GRANTED to
+ FILE_LOCK_CONFLICT! (tridge) */
+ if (NT_STATUS_EQUAL(status, NT_STATUS_LOCK_NOT_GRANTED)) {
+ status = NT_STATUS_FILE_LOCK_CONFLICT;
+ }
+
+ if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
+ /* Store the last lock error. */
+ files_struct *fsp = blr->fsp;
+
+ if (fsp) {
+ fsp->last_lock_failure.context.smbpid = blr->lock_pid;
+ fsp->last_lock_failure.context.tid = fsp->conn->cnum;
+ fsp->last_lock_failure.context.pid = procid_self();
+ fsp->last_lock_failure.start = blr->offset;
+ fsp->last_lock_failure.size = blr->count;
+ fsp->last_lock_failure.fnum = fsp->fnum;
+ fsp->last_lock_failure.lock_type = READ_LOCK; /* Don't care. */
+ fsp->last_lock_failure.lock_flav = blr->lock_flav;
+ }
+ }
+
+ ERROR_NT(status);
+ if (!srv_send_smb(smbd_server_fd(),outbuf, blr->encrypted)) {
+ exit_server_cleanly("generic_blocking_lock_error: srv_send_smb failed.");
+ }
+}
+
+/****************************************************************************
+ Return a lock fail error for a lockingX call. Undo all the locks we have
+ obtained first.
+*****************************************************************************/
+
+static void reply_lockingX_error(blocking_lock_record *blr, NTSTATUS status)
+{
+ char *inbuf = blr->inbuf;
+ files_struct *fsp = blr->fsp;
+ uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
+ SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT) 0;
+ uint32 lock_pid;
+ unsigned char locktype = CVAL(inbuf,smb_vwv3);
+ bool large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
+ char *data;
+ int i;
+
+ data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
+
+ /*
+ * Data now points at the beginning of the list
+ * of smb_lkrng structs.
+ */
+
+ /*
+ * Ensure we don't do a remove on the lock that just failed,
+ * as under POSIX rules, if we have a lock already there, we
+ * will delete it (and we shouldn't) .....
+ */
+
+ for(i = blr->lock_num - 1; i >= 0; i--) {
+ bool err;
+
+ lock_pid = get_lock_pid( data, i, large_file_format);
+ count = get_lock_count( data, i, large_file_format);
+ offset = get_lock_offset( data, i, large_file_format, &err);
+
+ /*
+ * We know err cannot be set as if it was the lock
+ * request would never have been queued. JRA.
+ */
+
+ do_unlock(smbd_messaging_context(),
+ fsp,
+ lock_pid,
+ count,
+ offset,
+ WINDOWS_LOCK);
+ }
+
+ generic_blocking_lock_error(blr, status);
+}
+
+/****************************************************************************
+ Return a lock fail error.
+*****************************************************************************/
+
+static void blocking_lock_reply_error(blocking_lock_record *blr, NTSTATUS status)
+{
+ switch(blr->com_type) {
+ case SMBlockingX:
+ reply_lockingX_error(blr, status);
+ break;
+ case SMBtrans2:
+ case SMBtranss2:
+ {
+ char outbuf[smb_size];
+ char *inbuf = blr->inbuf;
+ construct_reply_common(inbuf, outbuf);
+ /* construct_reply_common has done us the favor to pre-fill the
+ * command field with SMBtranss2 which is wrong :-)
+ */
+ SCVAL(outbuf,smb_com,SMBtrans2);
+ ERROR_NT(status);
+ if (!srv_send_smb(smbd_server_fd(),
+ outbuf,
+ IS_CONN_ENCRYPTED(blr->fsp->conn))) {
+ exit_server_cleanly("blocking_lock_reply_error: srv_send_smb failed.");
+ }
+ break;
+ }
+ default:
+ DEBUG(0,("blocking_lock_reply_error: PANIC - unknown type on blocking lock queue - exiting.!\n"));
+ exit_server("PANIC - unknown type on blocking lock queue");
+ }
+}
+
+/****************************************************************************
+ Attempt to finish off getting all pending blocking locks for a lockingX call.
+ Returns True if we want to be removed from the list.
+*****************************************************************************/
+
+static bool process_lockingX(blocking_lock_record *blr)
+{
+ char *inbuf = blr->inbuf;
+ unsigned char locktype = CVAL(inbuf,smb_vwv3);
+ files_struct *fsp = blr->fsp;
+ uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
+ uint16 num_locks = SVAL(inbuf,smb_vwv7);
+ SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
+ uint32 lock_pid;
+ bool large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
+ char *data;
+ NTSTATUS status = NT_STATUS_OK;
+
+ data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
+
+ /*
+ * Data now points at the beginning of the list
+ * of smb_lkrng structs.
+ */
+
+ for(; blr->lock_num < num_locks; blr->lock_num++) {
+ struct byte_range_lock *br_lck = NULL;
+ bool err;
+
+ lock_pid = get_lock_pid( data, blr->lock_num, large_file_format);
+ count = get_lock_count( data, blr->lock_num, large_file_format);
+ offset = get_lock_offset( data, blr->lock_num, large_file_format, &err);
+
+ /*
+ * We know err cannot be set as if it was the lock
+ * request would never have been queued. JRA.
+ */
+ errno = 0;
+ br_lck = do_lock(smbd_messaging_context(),
+ fsp,
+ lock_pid,
+ count,
+ offset,
+ ((locktype & LOCKING_ANDX_SHARED_LOCK) ?
+ READ_LOCK : WRITE_LOCK),
+ WINDOWS_LOCK,
+ True,
+ &status,
+ &blr->blocking_pid);
+
+ TALLOC_FREE(br_lck);
+
+ if (NT_STATUS_IS_ERR(status)) {
+ break;
+ }
+ }
+
+ if(blr->lock_num == num_locks) {
+ /*
+ * Success - we got all the locks.
+ */
+
+ DEBUG(3,("process_lockingX file = %s, fnum=%d type=%d num_locks=%d\n",
+ fsp->fsp_name, fsp->fnum, (unsigned int)locktype, num_locks) );
+
+ reply_lockingX_success(blr);
+ return True;
+ } else if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
+ !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
+ /*
+ * We have other than a "can't get lock"
+ * error. Free any locks we had and return an error.
+ * Return True so we get dequeued.
+ */
+
+ blocking_lock_reply_error(blr, status);
+ return True;
+ }
+
+ /*
+ * Still can't get all the locks - keep waiting.
+ */
+
+ DEBUG(10,("process_lockingX: only got %d locks of %d needed for file %s, fnum = %d. \
+Waiting....\n",
+ blr->lock_num, num_locks, fsp->fsp_name, fsp->fnum));
+
+ return False;
+}
+
+/****************************************************************************
+ Attempt to get the posix lock request from a SMBtrans2 call.
+ Returns True if we want to be removed from the list.
+*****************************************************************************/
+
+static bool process_trans2(blocking_lock_record *blr)
+{
+ struct smb_request *req;
+ char params[2];
+ NTSTATUS status;
+ struct byte_range_lock *br_lck = do_lock(smbd_messaging_context(),
+ blr->fsp,
+ blr->lock_pid,
+ blr->count,
+ blr->offset,
+ blr->lock_type,
+ blr->lock_flav,
+ True,
+ &status,
+ &blr->blocking_pid);
+ TALLOC_FREE(br_lck);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ if (ERROR_WAS_LOCK_DENIED(status)) {
+ /* Still can't get the lock, just keep waiting. */
+ return False;
+ }
+ /*
+ * We have other than a "can't get lock"
+ * error. Send an error and return True so we get dequeued.
+ */
+ blocking_lock_reply_error(blr, status);
+ return True;
+ }
+
+ /* We finally got the lock, return success. */
+
+ if (!(req = talloc(talloc_tos(), struct smb_request))) {
+ blocking_lock_reply_error(blr, NT_STATUS_NO_MEMORY);
+ return True;
+ }
+
+ init_smb_request(req, (uint8 *)blr->inbuf, 0, blr->encrypted);
+
+ SCVAL(req->inbuf, smb_com, SMBtrans2);
+ SSVAL(params,0,0);
+ /* Fake up max_data_bytes here - we know it fits. */
+ send_trans2_replies(blr->fsp->conn, req, params, 2, NULL, 0, 0xffff);
+ return True;
+}
+
+
+/****************************************************************************
+ Process a blocking lock SMB.
+ Returns True if we want to be removed from the list.
+*****************************************************************************/
+
+static bool blocking_lock_record_process(blocking_lock_record *blr)
+{
+ switch(blr->com_type) {
+ case SMBlockingX:
+ return process_lockingX(blr);
+ case SMBtrans2:
+ case SMBtranss2:
+ return process_trans2(blr);
+ default:
+ DEBUG(0,("blocking_lock_record_process: PANIC - unknown type on blocking lock queue - exiting.!\n"));
+ exit_server("PANIC - unknown type on blocking lock queue");
+ }
+ return False; /* Keep compiler happy. */
+}
+
+/****************************************************************************
+ Cancel entries by fnum from the blocking lock pending queue.
+*****************************************************************************/
+
+void cancel_pending_lock_requests_by_fid(files_struct *fsp, struct byte_range_lock *br_lck)
+{
+ blocking_lock_record *blr, *next = NULL;
+
+ for(blr = blocking_lock_queue; blr; blr = next) {
+ next = blr->next;
+ if(blr->fsp->fnum == fsp->fnum) {
+ unsigned char locktype = 0;
+
+ if (blr->com_type == SMBlockingX) {
+ locktype = CVAL(blr->inbuf,smb_vwv3);
+ }
+
+ if (br_lck) {
+ DEBUG(10,("remove_pending_lock_requests_by_fid - removing request type %d for \
+file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
+
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+
+ blocking_lock_cancel(fsp,
+ blr->lock_pid,
+ blr->offset,
+ blr->count,
+ blr->lock_flav,
+ locktype,
+ NT_STATUS_RANGE_NOT_LOCKED);
+ }
+ /* We're closing the file fsp here, so ensure
+ * we don't have a dangling pointer. */
+ blr->fsp = NULL;
+ }
+ }
+}
+
+/****************************************************************************
+ Delete entries by mid from the blocking lock pending queue. Always send reply.
+*****************************************************************************/
+
+void remove_pending_lock_requests_by_mid(int mid)
+{
+ blocking_lock_record *blr, *next = NULL;
+
+ for(blr = blocking_lock_queue; blr; blr = next) {
+ next = blr->next;
+ if(SVAL(blr->inbuf,smb_mid) == mid) {
+ files_struct *fsp = blr->fsp;
+ struct byte_range_lock *br_lck = brl_get_locks(talloc_tos(), fsp);
+
+ if (br_lck) {
+ 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 ));
+
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+ TALLOC_FREE(br_lck);
+ }
+
+ blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ }
+ }
+}
+
+/****************************************************************************
+ Is this mid a blocking lock request on the queue ?
+*****************************************************************************/
+
+bool blocking_lock_was_deferred(int mid)
+{
+ blocking_lock_record *blr, *next = NULL;
+
+ for(blr = blocking_lock_queue; blr; blr = next) {
+ next = blr->next;
+ if(SVAL(blr->inbuf,smb_mid) == mid) {
+ return True;
+ }
+ }
+ return False;
+}
+
+/****************************************************************************
+ Set a flag as an unlock request affects one of our pending locks.
+*****************************************************************************/
+
+static void received_unlock_msg(struct messaging_context *msg,
+ void *private_data,
+ uint32_t msg_type,
+ struct server_id server_id,
+ DATA_BLOB *data)
+{
+ DEBUG(10,("received_unlock_msg\n"));
+ process_blocking_lock_queue();
+}
+
+/****************************************************************************
+ Process the blocking lock queue. Note that this is only called as root.
+*****************************************************************************/
+
+static void process_blocking_lock_queue(void)
+{
+ struct timeval tv_curr = timeval_current();
+ blocking_lock_record *blr, *next = NULL;
+ bool recalc_timeout = False;
+
+ /*
+ * Go through the queue and see if we can get any of the locks.
+ */
+
+ for (blr = blocking_lock_queue; blr; blr = next) {
+ connection_struct *conn = NULL;
+ uint16 vuid;
+ files_struct *fsp = NULL;
+
+ next = blr->next;
+
+ /*
+ * 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(!change_to_user(conn,vuid)) {
+ struct byte_range_lock *br_lck = brl_get_locks(talloc_tos(), fsp);
+
+ /*
+ * Remove the entry and return an error to the client.
+ */
+
+ if (br_lck) {
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+ TALLOC_FREE(br_lck);
+ }
+
+ DEBUG(0,("process_blocking_lock_queue: Unable to become user vuid=%d.\n",
+ vuid ));
+ blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ recalc_timeout = True;
+ continue;
+ }
+
+ if(!set_current_service(conn,SVAL(blr->inbuf,smb_flg),True)) {
+ struct byte_range_lock *br_lck = brl_get_locks(talloc_tos(), fsp);
+
+ /*
+ * Remove the entry and return an error to the client.
+ */
+
+ if (br_lck) {
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+ TALLOC_FREE(br_lck);
+ }
+
+ DEBUG(0,("process_blocking_lock_queue: Unable to become service Error was %s.\n", strerror(errno) ));
+ blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ recalc_timeout = True;
+ change_to_root_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)) {
+ struct byte_range_lock *br_lck = brl_get_locks(talloc_tos(), fsp);
+
+ if (br_lck) {
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+ TALLOC_FREE(br_lck);
+ }
+
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ recalc_timeout = True;
+ change_to_root_user();
+ continue;
+ }
+
+ change_to_root_user();
+
+ /*
+ * We couldn't get the locks for this record on the list.
+ * If the time has expired, return a lock error.
+ */
+
+ if (!timeval_is_zero(&blr->expire_time) && timeval_compare(&blr->expire_time, &tv_curr) <= 0) {
+ struct byte_range_lock *br_lck = brl_get_locks(talloc_tos(), fsp);
+
+ /*
+ * Lock expired - throw away all previously
+ * obtained locks and return lock error.
+ */
+
+ if (br_lck) {
+ DEBUG(5,("process_blocking_lock_queue: pending lock fnum = %d for file %s timed out.\n",
+ fsp->fnum, fsp->fsp_name ));
+
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+ TALLOC_FREE(br_lck);
+ }
+
+ blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ recalc_timeout = True;
+ }
+ }
+
+ if (recalc_timeout) {
+ recalc_brl_timeout();
+ }
+}
+
+/****************************************************************************
+ Handle a cancel message. Lock already moved onto the cancel queue.
+*****************************************************************************/
+
+#define MSG_BLOCKING_LOCK_CANCEL_SIZE (sizeof(blocking_lock_record *) + sizeof(NTSTATUS))
+
+static void process_blocking_lock_cancel_message(struct messaging_context *ctx,
+ void *private_data,
+ uint32_t msg_type,
+ struct server_id server_id,
+ DATA_BLOB *data)
+{
+ NTSTATUS err;
+ const char *msg = (const char *)data->data;
+ blocking_lock_record *blr;
+
+ if (data->data == NULL) {
+ smb_panic("process_blocking_lock_cancel_message: null msg");
+ }
+
+ if (data->length != MSG_BLOCKING_LOCK_CANCEL_SIZE) {
+ DEBUG(0, ("process_blocking_lock_cancel_message: "
+ "Got invalid msg len %d\n", (int)data->length));
+ smb_panic("process_blocking_lock_cancel_message: bad msg");
+ }
+
+ memcpy(&blr, msg, sizeof(blr));
+ memcpy(&err, &msg[sizeof(blr)], sizeof(NTSTATUS));
+
+ DEBUG(10,("process_blocking_lock_cancel_message: returning error %s\n",
+ nt_errstr(err) ));
+
+ blocking_lock_reply_error(blr, err);
+ DLIST_REMOVE(blocking_lock_cancelled_queue, blr);
+ free_blocking_lock_record(blr);
+}
+
+/****************************************************************************
+ Send ourselves a blocking lock cancelled message. Handled asynchronously above.
+*****************************************************************************/
+
+bool blocking_lock_cancel(files_struct *fsp,
+ uint32 lock_pid,
+ SMB_BIG_UINT offset,
+ SMB_BIG_UINT count,
+ enum brl_flavour lock_flav,
+ unsigned char locktype,
+ NTSTATUS err)
+{
+ static bool initialized;
+ char msg[MSG_BLOCKING_LOCK_CANCEL_SIZE];
+ blocking_lock_record *blr;
+
+ if (!initialized) {
+ /* Register our message. */
+ messaging_register(smbd_messaging_context(), NULL,
+ MSG_SMB_BLOCKING_LOCK_CANCEL,
+ process_blocking_lock_cancel_message);
+
+ initialized = True;
+ }
+
+ for (blr = blocking_lock_queue; blr; blr = blr->next) {
+ if (fsp == blr->fsp &&
+ lock_pid == blr->lock_pid &&
+ offset == blr->offset &&
+ count == blr->count &&
+ lock_flav == blr->lock_flav) {
+ break;
+ }
+ }
+
+ if (!blr) {
+ return False;
+ }
+
+ /* Check the flags are right. */
+ if (blr->com_type == SMBlockingX &&
+ (locktype & LOCKING_ANDX_LARGE_FILES) !=
+ (CVAL(blr->inbuf,smb_vwv3) & LOCKING_ANDX_LARGE_FILES)) {
+ return False;
+ }
+
+ /* Move to cancelled queue. */
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ DLIST_ADD(blocking_lock_cancelled_queue, blr);
+
+ /* Create the message. */
+ memcpy(msg, &blr, sizeof(blr));
+ memcpy(&msg[sizeof(blr)], &err, sizeof(NTSTATUS));
+
+ messaging_send_buf(smbd_messaging_context(), procid_self(),
+ MSG_SMB_BLOCKING_LOCK_CANCEL,
+ (uint8 *)&msg, sizeof(msg));
+
+ return True;
+}
generated by cgit (git 2.34.1) at 2025-02-09 04:43:10 +0000