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/*
Unix SMB/Netbios implementation.
Version 3.0
printing backend routines
Copyright (C) Andrew Tridgell 1992-2000
Copyright (C) Jeremy Allison 2002
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"
#include "printing.h"
static struct tdb_print_db *print_db_head;
/****************************************************************************
Function to find or create the printer specific job tdb given a printername.
Limits the number of tdb's open to MAX_PRINT_DBS_OPEN.
****************************************************************************/
struct tdb_print_db *get_print_db_byname(const char *printername)
{
struct tdb_print_db *p = NULL, *last_entry = NULL;
int num_open = 0;
char *printdb_path = NULL;
bool done_become_root = False;
SMB_ASSERT(printername != NULL);
for (p = print_db_head, last_entry = print_db_head; p; p = p->next) {
/* Ensure the list terminates... JRA. */
SMB_ASSERT(p->next != print_db_head);
if (p->tdb && strequal(p->printer_name, printername)) {
DLIST_PROMOTE(print_db_head, p);
p->ref_count++;
return p;
}
num_open++;
last_entry = p;
}
/* Not found. */
if (num_open >= MAX_PRINT_DBS_OPEN) {
/* Try and recycle the last entry. */
if (print_db_head && last_entry) {
DLIST_PROMOTE(print_db_head, last_entry);
}
for (p = print_db_head; p; p = p->next) {
if (p->ref_count)
continue;
if (p->tdb) {
if (tdb_close(print_db_head->tdb)) {
DEBUG(0,("get_print_db: Failed to close tdb for printer %s\n",
print_db_head->printer_name ));
return NULL;
}
}
p->tdb = NULL;
p->ref_count = 0;
memset(p->printer_name, '\0', sizeof(p->printer_name));
break;
}
if (p && print_db_head) {
DLIST_PROMOTE(print_db_head, p);
p = print_db_head;
}
}
if (!p) {
/* Create one. */
p = SMB_MALLOC_P(struct tdb_print_db);
if (!p) {
DEBUG(0,("get_print_db: malloc fail !\n"));
return NULL;
}
ZERO_STRUCTP(p);
DLIST_ADD(print_db_head, p);
}
if (asprintf(&printdb_path, "%s%s.tdb",
cache_path("printing/"),
printername) < 0) {
DLIST_REMOVE(print_db_head, p);
SAFE_FREE(p);
return NULL;
}
if (geteuid() != sec_initial_uid()) {
become_root();
done_become_root = True;
}
p->tdb = tdb_open_log(printdb_path, 5000, TDB_DEFAULT, O_RDWR|O_CREAT,
0600);
if (done_become_root)
unbecome_root();
if (!p->tdb) {
DEBUG(0,("get_print_db: Failed to open printer backend database %s.\n",
printdb_path ));
DLIST_REMOVE(print_db_head, p);
SAFE_FREE(printdb_path);
SAFE_FREE(p);
return NULL;
}
SAFE_FREE(printdb_path);
fstrcpy(p->printer_name, printername);
p->ref_count++;
return p;
}
/***************************************************************************
Remove a reference count.
****************************************************************************/
void release_print_db( struct tdb_print_db *pdb)
{
pdb->ref_count--;
SMB_ASSERT(pdb->ref_count >= 0);
}
/***************************************************************************
Close all open print db entries.
****************************************************************************/
void close_all_print_db(void)
{
struct tdb_print_db *p = NULL, *next_p = NULL;
for (p = print_db_head; p; p = next_p) {
next_p = p->next;
if (p->tdb)
tdb_close(p->tdb);
DLIST_REMOVE(print_db_head, p);
ZERO_STRUCTP(p);
SAFE_FREE(p);
}
}
/****************************************************************************
Fetch and clean the pid_t record list for all pids interested in notify
messages. data needs freeing on exit.
****************************************************************************/
TDB_DATA get_printer_notify_pid_list(TDB_CONTEXT *tdb, const char *printer_name, bool cleanlist)
{
TDB_DATA data;
size_t i;
ZERO_STRUCT(data);
data = tdb_fetch_bystring( tdb, NOTIFY_PID_LIST_KEY );
if (!data.dptr) {
ZERO_STRUCT(data);
return data;
}
if (data.dsize % 8) {
DEBUG(0,("get_printer_notify_pid_list: Size of record for printer %s not a multiple of 8 !\n", printer_name ));
tdb_delete_bystring(tdb, NOTIFY_PID_LIST_KEY );
SAFE_FREE(data.dptr);
ZERO_STRUCT(data);
return data;
}
if (!cleanlist)
return data;
/*
* Weed out all dead entries.
*/
for( i = 0; i < data.dsize; i += 8) {
pid_t pid = (pid_t)IVAL(data.dptr, i);
if (pid == sys_getpid())
continue;
/* Entry is dead if process doesn't exist or refcount is zero. */
while ((i < data.dsize) && ((IVAL(data.dptr, i + 4) == 0) || !process_exists_by_pid(pid))) {
/* Refcount == zero is a logic error and should never happen. */
if (IVAL(data.dptr, i + 4) == 0) {
DEBUG(0,("get_printer_notify_pid_list: Refcount == 0 for pid = %u printer %s !\n",
(unsigned int)pid, printer_name ));
}
if (data.dsize - i > 8)
memmove( &data.dptr[i], &data.dptr[i+8], data.dsize - i - 8);
data.dsize -= 8;
}
}
return data;
}
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