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s3:smbd/files: work without sconn->file_bmap and assign fsp->fnum = -1

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For faked connection_structs we do not need valid fnum values,
e.g. in the dfs and printing code.

metze
This commit is contained in:
Stefan Metzmacher 2012-05-24 10:43:56 +02:00
parent 768004b11d
commit 0733183594
1 changed files with 39 additions and 23 deletions
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34
source3/smbd/files.c
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@ -48,15 +48,19 @@ NTSTATUS file_new(struct smb_request *req, connection_struct *conn,
files_struct **result)
{
struct smbd_server_connection *sconn = conn->sconn;
int i;
int i = -1;
files_struct *fsp;
NTSTATUS status;
/* we want to give out file handles differently on each new
connection because of a common bug in MS clients where they try to
reuse a file descriptor from an earlier smb connection. This code
increases the chance that the errant client will get an error rather
than causing corruption */
if (sconn->file_bmap != NULL) {
/*
* we want to give out file handles differently on each new
* connection because of a common bug in MS clients where they
* try to reuse a file descriptor from an earlier smb
* connection. This code increases the chance that the errant
* client will get an error rather than causing corruption
*/
if (sconn->first_file == 0) {
sconn->first_file = (getpid() ^ (int)time(NULL));
sconn->first_file %= sconn->real_max_open_files;
@ -67,11 +71,14 @@ NTSTATUS file_new(struct smb_request *req, connection_struct *conn,
i = bitmap_find(sconn->file_bmap, sconn->first_file);
if (i == -1) {
DEBUG(0,("ERROR! Out of file structures\n"));
/* TODO: We have to unconditionally return a DOS error here,
* W2k3 even returns ERRDOS/ERRnofids for ntcreate&x with
* NTSTATUS negotiated */
/*
* TODO: We have to unconditionally return a DOS error
* here, W2k3 even returns ERRDOS/ERRnofids for
* ntcreate&x with NTSTATUS negotiated
*/
return NT_STATUS_TOO_MANY_OPENED_FILES;
}
}
/*
* Make a child of the connection_struct as an fsp can't exist
@ -96,16 +103,19 @@ NTSTATUS file_new(struct smb_request *req, connection_struct *conn,
fsp->fh->ref_count = 1;
fsp->fh->fd = -1;
fsp->fnum = -1;
fsp->conn = conn;
fsp->fh->gen_id = get_gen_count(sconn);
GetTimeOfDay(&fsp->open_time);
if (sconn->file_bmap != NULL) {
sconn->first_file = (i+1) % (sconn->real_max_open_files);
bitmap_set(sconn->file_bmap, i);
fsp->fnum = i + FILE_HANDLE_OFFSET;
SMB_ASSERT(fsp->fnum < 65536);
}
DLIST_ADD(sconn->files, fsp);
sconn->num_files += 1;
@ -454,7 +464,9 @@ void file_free(struct smb_request *req, files_struct *fsp)
/* Ensure this event will never fire. */
TALLOC_FREE(fsp->update_write_time_event);
if (sconn->file_bmap != NULL) {
bitmap_clear(sconn->file_bmap, fsp->fnum - FILE_HANDLE_OFFSET);
}
DEBUG(5,("freed files structure %d (%u used)\n",
fsp->fnum, (unsigned int)sconn->num_files));
@ -501,6 +513,10 @@ static struct files_struct *file_fnum(struct smbd_server_connection *sconn,
int count=0;
for (fsp=sconn->files; fsp; fsp=fsp->next, count++) {
if (fsp->fnum == -1) {
continue;
}
if (fsp->fnum == fnum) {
if (count > 10) {
DLIST_PROMOTE(sconn->files, fsp);