--- /dev/null
+/*
+ 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 2 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, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#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;
+ pstring printdb_path;
+ 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. */
+ 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) {
+ 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);
+ }
+
+ pstrcpy(printdb_path, lock_path("printing/"));
+ pstrcat(printdb_path, printername);
+ pstrcat(printdb_path, ".tdb");
+
+ if (geteuid() != 0) {
+ 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(p);
+ return NULL;
+ }
+ 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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