#include "includes.h"
extern char *OutBuffer;
typedef struct _blocking_lock_record {
struct _blocking_lock_record *next;
struct _blocking_lock_record *prev;
int com_type;
files_struct *fsp;
time_t expire_time;
int lock_num;
SMB_BIG_UINT offset;
SMB_BIG_UINT count;
uint16 lock_pid;
char *inbuf;
int length;
} blocking_lock_record;
static blocking_lock_record *blocking_lock_queue;
static void free_blocking_lock_record(blocking_lock_record *blr)
{
DLIST_REMOVE(blocking_lock_queue, blr);
SAFE_FREE(blr->inbuf);
SAFE_FREE(blr);
}
static files_struct *get_fsp_from_pkt(char *inbuf)
{
switch(CVAL(inbuf,smb_com)) {
case SMBlock:
case SMBlockread:
return file_fsp(inbuf,smb_vwv0);
case SMBlockingX:
return file_fsp(inbuf,smb_vwv2);
default:
DEBUG(0,("get_fsp_from_pkt: PANIC - unknown type on blocking lock queue - exiting.!\n"));
exit_server("PANIC - unknown type on blocking lock queue");
}
return NULL;
}
static BOOL in_chained_smb(void)
{
return (chain_size != 0);
}
static void received_unlock_msg(int msg_type, pid_t src, void *buf, size_t len);
BOOL push_blocking_lock_request( char *inbuf, int length, int lock_timeout,
int lock_num, uint16 lock_pid, SMB_BIG_UINT offset, SMB_BIG_UINT count)
{
static BOOL set_lock_msg;
blocking_lock_record *blr, *tmp;
BOOL my_lock_ctx = False;
NTSTATUS status;
if(in_chained_smb() ) {
DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
return False;
}
if((blr = SMB_MALLOC_P(blocking_lock_record)) == NULL) {
DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
return False;
}
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(inbuf,smb_com);
blr->fsp = get_fsp_from_pkt(inbuf);
blr->expire_time = (lock_timeout == -1) ? (time_t)-1 : time(NULL) + (time_t)lock_timeout;
blr->lock_num = lock_num;
blr->lock_pid = lock_pid;
blr->offset = offset;
blr->count = count;
memcpy(blr->inbuf, inbuf, length);
blr->length = length;
status = brl_lock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
lock_pid, sys_getpid(), blr->fsp->conn->cnum,
offset, count, PENDING_LOCK, &my_lock_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("push_blocking_lock_request: failed to add PENDING_LOCK record.\n"));
free_blocking_lock_record(blr);
return False;
}
DLIST_ADD_END(blocking_lock_queue, blr, tmp);
if (!set_lock_msg) {
message_register(MSG_SMB_UNLOCK, received_unlock_msg);
set_lock_msg = True;
}
DEBUG(3,("push_blocking_lock_request: lock request length=%d blocked with expiry time %d (+%d) \
for fnum = %d, name = %s\n", length, (int)blr->expire_time, lock_timeout,
blr->fsp->fnum, blr->fsp->fsp_name ));
srv_defer_sign_response(SVAL(inbuf,smb_mid));
return True;
}
static void send_blocking_reply(char *outbuf, int outsize)
{
if(outsize > 4)
smb_setlen(outbuf,outsize - 4);
if (!send_smb(smbd_server_fd(),outbuf))
exit_server("send_blocking_reply: send_smb failed.");
}
static void reply_lockingX_success(blocking_lock_record *blr)
{
char *outbuf = OutBuffer;
int bufsize = BUFFER_SIZE;
char *inbuf = blr->inbuf;
int outsize = 0;
construct_reply_common(inbuf, outbuf);
set_message(outbuf,2,0,True);
outsize = chain_reply(inbuf,outbuf,blr->length,bufsize);
outsize += chain_size;
send_blocking_reply(outbuf,outsize);
}
static void generic_blocking_lock_error(blocking_lock_record *blr, NTSTATUS status)
{
char *outbuf = OutBuffer;
char *inbuf = blr->inbuf;
construct_reply_common(inbuf, outbuf);
if (NT_STATUS_EQUAL(status, NT_STATUS_LOCK_NOT_GRANTED)) {
status = NT_STATUS_FILE_LOCK_CONFLICT;
}
ERROR_NT(status);
if (!send_smb(smbd_server_fd(),outbuf))
exit_server("generic_blocking_lock_error: send_smb failed.");
}
static void reply_lockingX_error(blocking_lock_record *blr, NTSTATUS status)
{
char *inbuf = blr->inbuf;
files_struct *fsp = blr->fsp;
connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT) 0;
uint16 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);
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);
do_unlock(fsp,conn,lock_pid,count,offset);
}
generic_blocking_lock_error(blr, status);
}
static void blocking_lock_reply_error(blocking_lock_record *blr, NTSTATUS status)
{
switch(blr->com_type) {
case SMBlock:
case SMBlockread:
generic_blocking_lock_error(blr, status);
break;
case SMBlockingX:
reply_lockingX_error(blr, status);
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");
}
}
static BOOL process_lockread(blocking_lock_record *blr)
{
char *outbuf = OutBuffer;
char *inbuf = blr->inbuf;
ssize_t nread = -1;
char *data, *p;
int outsize = 0;
SMB_BIG_UINT startpos;
size_t numtoread;
NTSTATUS status;
connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
files_struct *fsp = blr->fsp;
BOOL my_lock_ctx = False;
numtoread = SVAL(inbuf,smb_vwv1);
startpos = (SMB_BIG_UINT)IVAL(inbuf,smb_vwv2);
numtoread = MIN(BUFFER_SIZE-outsize,numtoread);
data = smb_buf(outbuf) + 3;
status = do_lock_spin( fsp, conn, SVAL(inbuf,smb_pid), (SMB_BIG_UINT)numtoread, startpos, READ_LOCK, &my_lock_ctx);
if (NT_STATUS_V(status)) {
if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
!NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
generic_blocking_lock_error(blr, status);
return True;
}
DEBUG(10,("process_lockread: failed to get lock for file = %s. Still waiting....\n",
fsp->fsp_name));
return False;
}
nread = read_file(fsp,data,startpos,numtoread);
if (nread < 0) {
generic_blocking_lock_error(blr,NT_STATUS_ACCESS_DENIED);
return True;
}
construct_reply_common(inbuf, outbuf);
outsize = set_message(outbuf,5,0,True);
outsize += nread;
SSVAL(outbuf,smb_vwv0,nread);
SSVAL(outbuf,smb_vwv5,nread+3);
p = smb_buf(outbuf);
*p++ = 1;
SSVAL(p,0,nread); p += 2;
set_message_end(outbuf, p+nread);
DEBUG(3, ( "process_lockread file = %s, fnum=%d num=%d nread=%d\n",
fsp->fsp_name, fsp->fnum, (int)numtoread, (int)nread ) );
send_blocking_reply(outbuf,outsize);
return True;
}
static BOOL process_lock(blocking_lock_record *blr)
{
char *outbuf = OutBuffer;
char *inbuf = blr->inbuf;
int outsize;
SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
NTSTATUS status;
connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
files_struct *fsp = blr->fsp;
BOOL my_lock_ctx = False;
count = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv1);
offset = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv3);
errno = 0;
status = do_lock_spin(fsp, conn, SVAL(inbuf,smb_pid), count, offset, WRITE_LOCK, &my_lock_ctx);
if (NT_STATUS_IS_ERR(status)) {
if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
!NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
blocking_lock_reply_error(blr, status);
return True;
}
DEBUG(10,("process_lock: failed to get lock for file = %s. Still waiting....\n",
fsp->fsp_name));
return False;
}
DEBUG(3,("process_lock : file=%s fnum=%d offset=%.0f count=%.0f\n",
fsp->fsp_name, fsp->fnum, (double)offset, (double)count));
construct_reply_common(inbuf, outbuf);
outsize = set_message(outbuf,0,0,True);
send_blocking_reply(outbuf,outsize);
return True;
}
static BOOL process_lockingX(blocking_lock_record *blr)
{
char *inbuf = blr->inbuf;
unsigned char locktype = CVAL(inbuf,smb_vwv3);
files_struct *fsp = blr->fsp;
connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
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;
uint16 lock_pid;
BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
char *data;
BOOL my_lock_ctx = False;
NTSTATUS status = NT_STATUS_OK;
data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
for(; blr->lock_num < num_locks; blr->lock_num++) {
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);
errno = 0;
status = do_lock_spin(fsp,conn,lock_pid,count,offset,
((locktype & 1) ? READ_LOCK : WRITE_LOCK), &my_lock_ctx);
if (NT_STATUS_IS_ERR(status)) break;
}
if(blr->lock_num == num_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)) {
blocking_lock_reply_error(blr, status);
return True;
}
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;
}
static BOOL blocking_lock_record_process(blocking_lock_record *blr)
{
switch(blr->com_type) {
case SMBlock:
return process_lock(blr);
case SMBlockread:
return process_lockread(blr);
case SMBlockingX:
return process_lockingX(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;
}
void remove_pending_lock_requests_by_fid(files_struct *fsp)
{
blocking_lock_record *blr, *next = NULL;
for(blr = blocking_lock_queue; blr; blr = next) {
next = blr->next;
if(blr->fsp->fnum == fsp->fnum) {
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_unlock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
blr->lock_pid, sys_getpid(), blr->fsp->conn->cnum,
blr->offset, blr->count, True, NULL, NULL);
free_blocking_lock_record(blr);
}
}
}
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;
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,NT_STATUS_FILE_LOCK_CONFLICT);
brl_unlock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
blr->lock_pid, sys_getpid(), blr->fsp->conn->cnum,
blr->offset, blr->count, True, NULL, NULL);
free_blocking_lock_record(blr);
}
}
}
static void received_unlock_msg(int msg_type, pid_t src, void *buf, size_t len)
{
DEBUG(10,("received_unlock_msg\n"));
process_blocking_lock_queue(time(NULL));
}
unsigned blocking_locks_timeout(unsigned default_timeout)
{
unsigned timeout = default_timeout;
time_t t;
blocking_lock_record *blr = blocking_lock_queue;
if (!blr)
return timeout;
t = time(NULL);
for (; blr; blr = blr->next) {
if ((blr->expire_time != (time_t)-1) &&
(timeout > (blr->expire_time - t))) {
timeout = blr->expire_time - t;
}
}
if (timeout < 1)
timeout = 1;
return timeout;
}
void process_blocking_lock_queue(time_t t)
{
blocking_lock_record *blr, *next = NULL;
for (blr = blocking_lock_queue; blr; blr = next) {
connection_struct *conn = NULL;
uint16 vuid;
files_struct *fsp = NULL;
next = blr->next;
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)) {
DEBUG(5,("process_blocking_lock_queue: pending lock fnum = %d for file %s timed out.\n",
fsp->fnum, fsp->fsp_name ));
brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
blr->lock_pid, sys_getpid(), conn->cnum,
blr->offset, blr->count, True, NULL, NULL);
blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
free_blocking_lock_record(blr);
continue;
}
if(!change_to_user(conn,vuid)) {
DEBUG(0,("process_blocking_lock_queue: Unable to become user vuid=%d.\n",
vuid ));
blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
blr->lock_pid, sys_getpid(), conn->cnum,
blr->offset, blr->count, True, NULL, NULL);
free_blocking_lock_record(blr);
continue;
}
if(!set_current_service(conn,SVAL(blr->inbuf,smb_flg),True)) {
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);
brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
blr->lock_pid, sys_getpid(), conn->cnum,
blr->offset, blr->count, True, NULL, NULL);
free_blocking_lock_record(blr);
change_to_root_user();
continue;
}
if(blocking_lock_record_process(blr)) {
brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
blr->lock_pid, sys_getpid(), conn->cnum,
blr->offset, blr->count, True, NULL, NULL);
free_blocking_lock_record(blr);
}
change_to_root_user();
}
}